# Assign addresses (co-ordinates) to instructions (landmarks) in a program
# (landscape).
# Use the addresses assigned to:
# a) replace labels
# b) add segment headers with addresses and offsets correctly filled in
#
# To build (from the subx/ directory):
# $ ./subx translate *.subx apps/survey.subx -o apps/survey
#
# The expected input is a stream of bytes with segment headers, comments and
# some interspersed labels.
# $ cat x
# == code 0x1
# l1:
# aa bb l1/imm8
# cc dd l2/disp32
# l2:
# ee foo/imm32
# == data 0x10
# foo:
# 00
#
# The output is the stream of bytes without segment headers or label definitions,
# and with label references replaced with numeric values/displacements.
#
# $ cat x |./subx run apps/assort
# ...ELF header bytes...
# # ELF header above will specify that code segment begins at this offset
# aa bb nn # some computed address
# cc dd nn nn nn nn # some computed displacement
# ee nn nn nn nn # some computed address
# # ELF header above will specify that data segment begins at this offset
# 00
== code
# instruction effective address register displacement immediate
# . op subop mod rm32 base index scale r32
# . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes
Entry:
# Heap = new-segment(64KB)
# . . push args
68/push Heap/imm32
68/push 0x10000/imm32/64KB
# . . call
e8/call new-segment/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# initialize-trace-stream(256KB)
# . . push args
68/push 0x40000/imm32/256KB
# . . call
e8/call initialize-trace-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# run tests if necessary, convert stdin if not
# . prolog
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# initialize heap
# - if argc > 1 and argv[1] == "test", then return run_tests()
# . argc > 1
81 7/subop/compare 1/mod/*+disp8 5/rm32/EBP . . . . 0/disp8 1/imm32 # compare *EBP
7e/jump-if-lesser-or-equal $run-main/disp8
# . argv[1] == "test"
# . . push args
68/push "test"/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call kernel-string-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check result
3d/compare-EAX-and 1/imm32
75/jump-if-not-equal $run-main/disp8
# . run-tests()
e8/call run-tests/disp32
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/EBX Num-test-failures/disp32 # copy *Num-test-failures to EBX
eb/jump $main:end/disp8
$run-main:
# - otherwise convert stdin
# var ed/EAX : exit-descriptor
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # subtract from ESP
89/copy 3/mod/direct 0/rm32/EAX . . . 4/r32/ESP . . # copy ESP to EAX
# configure ed to really exit()
# . ed->target = 0
c7 0/subop/copy 0/mod/direct 0/rm32/EAX . . . . . 0/imm32 # copy to *EAX
# return convert(Stdin, 1/stdout, 2/stderr, ed)
# . . push args
50/push-EAX/ed
68/push Stderr/imm32
68/push Stdout/imm32
68/push Stdin/imm32
# . . call
e8/call convert/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x10/imm32 # add to ESP
# . syscall(exit, 0)
bb/copy-to-EBX 0/imm32
$main:end:
b8/copy-to-EAX 1/imm32/exit
cd/syscall 0x80/imm8
# data structures:
# segment-info: {address, file-offset, size} (12 bytes)
# segments: (address stream {string, segment-info}) (16 bytes per row)
# label-info: {segment-name, segment-offset, address} (12 bytes)
# labels: (address stream {string, label-info}) (16 bytes per row)
# these are all inefficient; use sequential scans for lookups
convert: # in : (address buffered-file), out : (address buffered-file) -> <void>
# pseudocode
# var segments = new-stream(10 rows, 16 bytes each)
# var labels = new-stream(512 rows, 16 bytes each)
# compute-offsets(in, segments, labels)
# compute-addresses(segments, labels)
# rewind-stream(in)
# emit-output(in, out, segments, labels)
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
51/push-ECX
52/push-EDX
# var segments/ECX = stream(10 * 16)
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 0xa0/imm32 # subtract from ESP
68/push 0xa0/imm32/length
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX
# var labels/EDX = stream(512 * 16)
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 0x2000/imm32 # subtract from ESP
68/push 0x2000/imm32/length
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/EDX . . . 4/r32/ESP . . # copy ESP to EDX
# compute-offsets(in, segments, labels)
# . . push args
52/push-EDX
51/push-ECX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call compute-offsets/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# compute-addresses(segments, labels)
# . . push args
52/push-EDX
51/push-ECX
# . . call
e8/call compute-addresses/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x10/imm32 # add to ESP
# rewind-stream(in)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call rewind-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# emit-output(in, out, segments, labels)
# . . push args
52/push-EDX
51/push-ECX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call emit-output/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x10/imm32 # add to ESP
$convert:end:
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x214/imm32 # add to ESP
# . restore registers
5a/pop-to-EDX
59/pop-to-ECX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-convert-computes-addresses:
# input:
# == code 0x1
# ab x/imm32
# == data 0x1000
# x:
# 01
#
# trace contains (in any order):
# label x is at address 0x1079
# segment code starts at address 0x74
# segment code has size 5
# segment data starts at address 0x1079
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-input-buffered-file+4)
# . . push args
b8/copy-to-EAX _test-input-buffered-file/imm32
05/add-to-EAX 4/imm32
50/push-EAX
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-buffered-file+4)
# . . push args
b8/copy-to-EAX _test-output-buffered-file/imm32
05/add-to-EAX 4/imm32
50/push-EAX
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# initialize input
# . write(_test-input-stream, "== code 0x1\n")
# . . push args
68/push "== code 0x1\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "ab x/imm32\n")
# . . push args
68/push "ab x/imm32\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "== data 0x1000\n")
# . . push args
68/push "== data 0x1000\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "x:\n")
# . . push args
68/push "x:\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "01\n")
# . . push args
68/push "01\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# convert(_test-input-buffered-file, _test-output-buffered-file)
# . . push args
68/push _test-output-buffered-file/imm32
68/push _test-input-buffered-file/imm32
# . . call
e8/call convert/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# check trace
# . check-trace-contains("label 'x' is at address 0x1079", msg)
# . . push args
68/push "F - test-convert-computes-addresses/0"/imm32
68/push "label 'x' is at address 0x1079"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("segment 'code' starts at address 0x74", msg)
# . . push args
68/push "F - test-convert-computes-addresses/1"/imm32
68/push "segment 'code' starts at address 0x74"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("segment 'code' has size 0x5", msg)
# . . push args
68/push "F - test-convert-computes-addresses/2"/imm32
68/push "segment 'code' has size 0x5"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("segment 'data' starts at address 0x1079", msg)
# . . push args
68/push "F - test-convert-computes-addresses/3"/imm32
68/push "segment 'data' starts at address 0x1079"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
# global scratch space for compute-offsets in the data segment
== data
compute-offsets:curr-segment-name:
0/imm32/start
compute-offsets:curr-segment-name:end:
0/imm32/end
compute-offsets:file-offset:
0/imm32
compute-offsets:segment-offset:
0/imm32
compute-offsets:word-slice:
0/imm32/start
compute-offsets:word-slice:end:
0/imm32/end
compute-offsets:segment-start:
0/imm32/start
0/imm32/end
== code
compute-offsets: # in : (address buffered-file), segments : (address stream {string, segment-info}), labels : (address stream {string, label-info})
# pseudocode:
# var curr-segment-name : (address slice) = {0, 0}
# var file-offset = 0, segment-offset = 0
# var line = new-stream(512, 1)
# while true # line loop
# clear-stream(line)
# read-line-buffered(in, line)
# if (line->write == 0) break # end of file
# while true # word loop
# var word-slice = next-word(line)
# if slice-empty?(word-slice) # end of line
# break
# if slice-starts-with?(word-slice, "#") # comment
# continue
# if is-label?(word-slice)
# x : (address number) = get-or-insert(labels, name)
# *x = segment-offset
# trace("label '", word-slice, "' is in segment '", curr-segment-name, "'")
# trace("label '", word-slice, "' is at offset 0x", file-offset)
# # labels occupy no space, so no need to increment offsets
# continue
# if slice-equal?(word-slice, "==")
# if !slice-empty?(curr-segment-name)
# seg = get-or-insert-slice(segments, curr-segment-name)
# seg->size = *file-offset - seg->file-offset
# trace("segment '", curr-segment-name, "' has size 0x", seg->size)
# curr-segment-name = next-word(line)
# if slice-empty?(curr-segment-name)
# abort
# segment-start = next-word(line)
# if slice-empty?(segment-start)
# abort
# seg = get-or-insert-slice(segments, curr-segment-name)
# seg->starting-address = parse-hex-int(segment-start)
# seg->file-offset = *file-offset
# trace("segment '", curr-segment-name, "' is at file offset 0x", seg->file-offset)
# segment-offset = 0
# else
# width = compute-width-of-slice(word-slice)
# *segment-offset += width
# *file-offset += width
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
50/push-EAX
51/push-ECX
52/push-EDX
53/push-EBX
56/push-ESI
57/push-EDI
# curr-segment-name = {0, 0}
c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:curr-segment-name/disp32 0/imm32 # copy to *compute-offsets:word-slice
c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:curr-segment-name:end/disp32 0/imm32 # copy to *(compute-offsets:word-slice+4)
# file-offset = 0
b8/copy-to-EAX 0/imm32
89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX compute-offsets:file-offset/disp32 # copy EAX to *file-offset
# segment-offset = 0
c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:segment-offset/disp32 0/imm32 # copy to *compute-offsets:word-slice
# line/ECX = new-stream(512, 1)
# . EAX = new-stream(512, 1)
# . . push args
68/push 1/imm32
68/push 0x200/imm32
68/push Heap/imm32
# . . call
e8/call new-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . line/ECX = EAX
89/copy 3/mod/direct 1/rm32/ECX . . . 0/r32/EAX . . # copy EAX to ECX
$compute-offsets:line-loop:
# clear-stream(line/ECX)
51/push-ECX
e8/call clear-stream/disp32
# . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# read-line-buffered(in, line/ECX)
51/push-ECX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
e8/call read-line-buffered/disp32
# . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# if (line->write == 0) break
8b/copy 0/mod/indirect 1/rm32/ECX . . . 0/r32/EAX . . # copy *ECX to EAX
3d/compare-EAX-and 0/imm32
0f 84/jump-if-equal $compute-offsets:end/disp32
$compute-offsets:word-loop:
# var word-slice/EDX = {0, 0}
c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:word-slice/disp32 0/imm32 # copy to *compute-offsets:word-slice
c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:word-slice:end/disp32 0/imm32 # copy to *(compute-offsets:word-slice+4)
ba/copy-to-EDX compute-offsets:word-slice/imm32
# next-word(line/ECX, word-slice/EDX)
52/push-EDX
51/push-ECX
e8/call next-word/disp32
# . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# if slice-empty?(word/EDX) break
# . EAX = slice-empty?(word/EDX)
52/push-EDX
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . if (EAX != 0) break
3d/compare-EAX-and 0/imm32
0f 85/jump-if-not-equal $compute-offsets:line-loop/disp32
# if slice-starts-with?(word-slice, "#") continue
68/push "#"/imm32
52/push-EDX
e8/call slice-starts-with?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . if (EAX != 0) continue
3d/compare-EAX-and 0/imm32
75/jump-if-not-equal $compute-offsets:word-loop/disp8
$compute-offsets:label:
# if (!is-label?(word-slice/EDX)) goto next check
# . EAX = is-label?(word-slice/EDX)
# . . push args
52/push-EDX
# . . call
e8/call is-label?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . if (EAX == 0) goto next check
3d/compare-EAX-and 0/imm32
74/jump-if-equal $compute-offsets:segment/disp8
# x/EAX = get-or-insert(labels, word-slice)
# . . push args
68/push 0x10/imm32/row-size
52/push-EDX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
# . . call
e8/call get-or-insert/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# TODO: *x = segment-offset
# trace-slsls("label '" word-slice/EDX "' is in segment '" current-segment-name "'")
# . . push args
68/push "'"/imm32
68/push compute-offsets:curr-segment-name/imm32
68/push "' is in segment '"/imm32
52/push-EDX
68/push "label '"/imm32
# . . call
e8/call trace-slsls/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# trace-slsns("label '" word-slice/EDX "' is at offset '" *file-offset/EAX "'")
# . . EAX = file-offset
b8/copy-to-EAX compute-offsets:file-offset/imm32
# . . EAX = *file-offset/EAX
8b/copy 0/mod/indirect 0/rm32/EAX . . . 0/r32/EAX . . # copy *EAX to EAX
# . . push args
68/push "."/imm32
50/push-EAX
68/push "' is at offset "/imm32
52/push-EDX
68/push "label '"/imm32
# . . call
e8/call trace-slsns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# continue
e9/jump $compute-offsets:word-loop/disp32
$compute-offsets:segment:
# if (!slice-equal?(word-slice/EDX, "==")) goto next check
# . EAX = slice-equal?(word-slice/EDX, "==")
68/push "=="/imm32
52/push-EDX
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . if (EAX == 0) goto next check
3d/compare-EAX-and 0/imm32
0f 84/jump-if-equal $compute-offsets:else/disp32
# if (curr-segment-name->start == 0) goto construct-next-segment
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX compute-offsets:curr-segment-name/disp32 # copy *curr-segment-name to EAX
3d/compare-EAX-and 0/imm32
74/jump-if-equal $compute-offsets:construct-next-segment/disp8
# seg/EAX = get-or-insert-slice(segments, curr-segment-name, row-size=16)
# . . push args
68/push 0x10/imm32/row-size
68/push compute-offsets:curr-segment-name/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
# . . call
e8/call get-or-insert-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# seg->size = file-offset - seg->file-offset
# . save ECX
51/push-ECX
# . EBX = *file-offset
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/EBX compute-offsets:file-offset/disp32 # copy *file-offset to EBX
# . ECX = seg->file-offset
8b/copy 1/mod/*+disp8 0/rm32/EAX . . . 1/r32/ECX 4/disp8 . # copy *(EAX+4) to ECX
# . EBX -= ECX
29/subtract 3/mod/direct 3/rm32/EBX . . . 1/r32/ECX . . # subtract ECX from EBX
# . seg->size = EBX
89/copy 1/mod/*+disp8 0/rm32/EAX . . . 3/r32/EBX 8/disp8 . # copy EBX to *(EAX+8)
# . restore ECX
59/pop-to-ECX
# trace-slsns("segment '", curr-segment-name, "' has size 0x", seg->size, ".")
# . . push args
68/push "."/imm32
53/push-EBX
68/push "' has size "/imm32
68/push compute-offsets:curr-segment-name/imm32
68/push "segment '"/imm32
# . . call
e8/call trace-slsns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
$compute-offsets:construct-next-segment:
# next-word(line/ECX, curr-segment-name)
68/push compute-offsets:curr-segment-name/imm32
51/push-ECX
e8/call next-word/disp32
# . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# if slice-empty?(curr-segment-name) abort
# . EAX = slice-empty?(curr-segment-name)
68/push compute-offsets:curr-segment-name/imm32
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . if (EAX != 0) abort
3d/compare-EAX-and 0/imm32
0f 85/jump-if-not-equal $compute-offsets:abort/disp32
# next-word(line/ECX, segment-start)
68/push compute-offsets:segment-start/imm32
51/push-ECX
e8/call next-word/disp32
# . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# if slice-empty?(segment-start) abort
# . EAX = slice-empty?(segment-start)
68/push compute-offsets:segment-start/imm32
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . if (EAX != 0) abort
3d/compare-EAX-and 0/imm32
0f 85/jump-if-not-equal $compute-offsets:abort/disp32
# seg/EBX = get-or-insert-slice(segments, curr-segment-name, row-size=16)
# . . push args
68/push 0x10/imm32/row-size
68/push compute-offsets:curr-segment-name/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
# . . call
e8/call get-or-insert/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . EBX = EAX
89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX
# seg->address = parse-hex-int(segment-start)
# . EAX = parse-hex-int(segment-start)
68/push compute-offsets:segment-start/imm32
e8/call parse-hex-int/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . seg->address = EAX
89/copy 0/mod/indirect 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to *EBX
# seg->file-offset = *file-offset
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX compute-offsets:file-offset/disp32 # copy *file-offset to EAX
89/copy 1/mod/*+disp8 3/rm32/EBX . . . 0/r32/EAX 4/disp8 . # copy EAX to *(EBX+4)
# trace-slsns("segment '", curr-segment-name, "' is at file offset ", seg->file-offset, "")
# . . push args
68/push "."/imm32
50/push-EAX
68/push "' is at file offset "/imm32
68/push compute-offsets:curr-segment-name/imm32
68/push "segment '"/imm32
# . . call
e8/call trace-slsns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# segment-offset = 0
c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:segment-offset/disp32 0/imm32 # copy to *segment-offset
e9/jump $compute-offsets:line-loop/disp32
$compute-offsets:else:
# width/EAX = compute-width-of-slice(word-slice)
# . . push args
52/push-EDX
# . . call
e8/call compute-width-of-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# segment-offset += width
01/add 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX compute-offsets:segment-offset/disp32 # add EAX to *segment-offset
# file-offset += width
01/add 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX compute-offsets:file-offset/disp32 # add EAX to *file-offset
e9/jump $compute-offsets:word-loop/disp32
$compute-offsets:end:
# . reclaim locals
# . restore registers
5f/pop-to-EDI
5e/pop-to-ESI
5b/pop-to-EBX
5a/pop-to-EDX
59/pop-to-ECX
58/pop-to-EAX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
$compute-offsets:abort:
# . _write(2/stderr, error)
# . . push args
68/push "'==' must be followed by segment name and segment-start\n"/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . syscall(exit, 1)
bb/copy-to-EBX 1/imm32
b8/copy-to-EAX 1/imm32/exit
cd/syscall 0x80/imm8
# never gets here
test-compute-offsets:
# input:
# == code 0x1
# ab x/imm32
# == data 0x1000
# x:
# 34
#
# trace contains (in any order):
# segment 'code' is at file offset 0x0
# segment 'code' has size 0x5
# segment 'data' is at file offset 0x5
# label 'x' is in segment 'data'
# label 'x' is at offset 0x0
# segment 'data' has size 0x1
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-input-buffered-file+4)
# . . push args
b8/copy-to-EAX _test-input-buffered-file/imm32
05/add-to-EAX 4/imm32
50/push-EAX
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-buffered-file+4)
# . . push args
b8/copy-to-EAX _test-output-buffered-file/imm32
05/add-to-EAX 4/imm32
50/push-EAX
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# var segments/ECX = stream(2 * 16)
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 0x20/imm32 # subtract from ESP
68/push 0x20/imm32/length
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX
# var labels/EDX = stream(2 * 16)
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 0x20/imm32 # subtract from ESP
68/push 0x20/imm32/length
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/EDX . . . 4/r32/ESP . . # copy ESP to EDX
# initialize input
# . write(_test-input-stream, "== code 0x1\n")
# . . push args
68/push "== code 0x1\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "ab x/imm32\n")
# . . push args
68/push "ab x/imm32\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "== data 0x1000\n")
# . . push args
68/push "== data 0x1000\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "x:\n")
# . . push args
68/push "x:\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "34\n")
# . . push args
68/push "34\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# compute-offsets(_test-input-buffered-file, segments, labels)
# . . push args
52/push-EDX
51/push-ECX
68/push _test-input-buffered-file/imm32
# . . call
e8/call compute-offsets/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# check trace
# . check-trace-contains("segment 'code' is at file offset 0x00000000.", msg)
# . . push args
68/push "F - test-compute-offsets/0"/imm32
68/push "segment 'code' is at file offset 0x00000000."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("segment 'code' has size 0x5", msg)
# . . push args
68/push "F - test-compute-offsets/1"/imm32
68/push "segment 'code' has size 0x5"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("segment 'data' is at file offset 0x5", msg)
# . . push args
68/push "F - test-compute-offsets/2"/imm32
68/push "segment 'data' is at file offset 0x5"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("segment 'data' has size 0x1", msg)
# . . push args
68/push "F - test-compute-offsets/3"/imm32
68/push "segment 'data' has size 0x1"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("label 'x' is in segment 'data'", msg)
# . . push args
68/push "F - test-compute-offsets/4"/imm32
68/push "label 'x' is in segment 'data'"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("label 'x' is at offset 0x0", msg)
# . . push args
68/push "F - test-compute-offsets/5"/imm32
68/push "label 'x' is at offset 0x0"/imm32
# . . call
e8/call check-trace-contains/disp32
# dump *Trace-stream {{{
# . write(2/stderr, "^")
# . . push args
68/push "^"/imm32
68/push 2/imm32/stderr
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write-stream(2/stderr, *Trace-stream)
# . . push args
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
68/push 2/imm32/stderr
# . . call
e8/call write-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(2/stderr, "$\n")
# . . push args
68/push "$\n"/imm32
68/push 2/imm32/stderr
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# }}}
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
compute-addresses: # segments : (address stream {string, segment-info}), labels : (address stream {string, label-info})
# pseudocode:
# srow : (address segment-info) = segments->data
# max = segments->data + segments->write
# num-segments = segments->write / 16
# starting-offset = 0x34 + (num-segments * 0x20)
# while true
# if (srow >= max) break
# s->file-offset += starting-offset
# s->address &= 0xfffff000 # clear last 12 bits for p_align
# s->address += (s->file-offset & 0x00000fff)
# trace-sssns("segment " s->key " starts at address " s->address)
# srow += 16 # row-size
# lrow : (address label-info) = labels->data
# max = labels->data + labels->write
# while true
# if (lrow >= max) break
# seg-name : (address string) = lrow->segment-name
# label-seg : (address segment-info) = get-or-insert(segments, seg-name, row-size=16)
# lrow->address = label-seg->address + lrow->segment-offset
# trace-sssns("label " lrow->key " is at address " lrow->address)
# lrow += 16 # row-size
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
50/push-EAX
51/push-ECX
52/push-EDX
53/push-EBX
56/push-ESI
57/push-EDI
# ESI = segments
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 6/r32/ESI 8/disp8 . # copy *(EBP+8) to ESI
# starting-offset/EDI = 0x34 + (num-segments * 0x20) # make room for ELF headers
# . EDI = segments->write / 16 (row-size)
8b/copy 0/mod/indirect 6/rm32/ESI . . . 7/r32/EDI . . # copy *ESI to EDI
c1/shift 5/subop/logic-right 3/mod/direct 7/rm32/EDI . . . . . 4/imm8 # shift EDI right by 4 bits, while padding zeroes
# . EDI = (EDI * 0x20) + 0x34
c1/shift 4/subop/left 3/mod/direct 7/rm32/EDI . . . . . 5/imm8 # shift EDI left by 5 bits
81 0/subop/add 3/mod/direct 7/rm32/EDI . . . . . 0x34/imm32 # add to EDI
# srow/EAX = segments->data
8d/copy-address 1/mod/*+disp8 6/rm32/ESI . . . 0/r32/EAX 0xc/disp8 . # copy ESI+12 to EAX
# max/ECX = segments->data + segments->write
8b/copy 0/mod/indirect 6/rm32/ESI . . . 1/r32/ECX . . # copy *ESI to ECX
01/add 3/mod/direct 1/rm32/ECX . . . 6/r32/ESI . . # add ESI to ECX
$compute-addresses:segment-loop:
# if (srow >= max) break
39/compare 3/mod/direct 0/rm32/EAX . . . 1/r32/ECX . . # compare EAX with ECX
73/jump-if-greater-or-equal-unsigned $compute-addresses:segment-break/disp8
# srow->file-offset += starting-offset
01/add 1/mod/*+disp8 0/rm32/EAX . . . 7/r32/EDI 8/disp8 . # add EDI to *(EAX+8)
# clear last 12 bits of srow->address for p_align=0x1000
# . EDX = srow->address
8b/copy 1/mod/*+disp8 0/rm32/EAX . . . 2/r32/EDX 4/disp8 . # copy *(EAX+4) to EDX
# . EDX &= 0xfffff000
81 4/subop/and 3/mod/direct 2/rm32/EDX . . . . . 0xfffff000/imm32 # bitwise and of EDX
# update last 12 bits from srow->file-offset
# . EBX = srow->file-offset
8b/copy 1/mod/*+disp8 0/rm32/EAX . . . 3/r32/EBX 8/disp8 . # copy *(EAX+8) to EBX
# . EBX &= 0xfff
81 4/subop/and 3/mod/direct 3/rm32/EBX . . . . . 0x00000fff/imm32 # bitwise and of EBX
# . srow->address = EDX | EBX
09/or 3/mod/direct 2/rm32/EDX . . . 3/r32/EBX . . # EDX = bitwise OR with EBX
89/copy 1/mod/*+disp8 0/rm32/EAX . . . 2/r32/EDX 4/disp8 . # copy EDX to *(EAX+4)
# trace-sssns("segment " srow " starts at address " srow->address ".")
# . . push args
68/push "."/imm32
52/push-EDX
68/push "' starts at address "/imm32
ff 6/subop/push 0/mod/indirect 0/rm32/EAX . . . . . . # push *EAX
68/push "segment '"/imm32
# . . call
e8/call trace-sssns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# srow += 16 # size of row
05/add-to-EAX 0x10/imm32
eb/jump $compute-addresses:segment-loop/disp8
$compute-addresses:segment-break:
# ESI = labels
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 6/r32/ESI 0xc/disp8 . # copy *(EBP+12) to ESI
# lrow/EAX = labels->data
8d/copy-address 1/mod/*+disp8 6/rm32/ESI . . . 0/r32/EAX 0xc/disp8 . # copy ESI+12 to EAX
# max/ECX = labels->data + labels->write
8b/copy 0/mod/indirect 6/rm32/ESI . . . 1/r32/ECX . . # copy *ESI to ECX
01/add 3/mod/direct 1/rm32/ECX . . . 6/r32/ESI . . # add ESI to ECX
$compute-addresses:label-loop:
# if (lrow >= max) break
39/compare 3/mod/direct 0/rm32/EAX . . . 1/r32/ECX . . # compare EAX with ECX
73/jump-if-greater-or-equal-unsigned $compute-addresses:end/disp8
# seg-name/EDX = lrow->segment-name
8b/copy 1/mod/*+disp8 0/rm32/EAX . . . 2/r32/EDX 4/disp8 . # copy *EAX to EDX
# label-seg/EDX : (address segment-info) = get-or-insert(segments, seg-name, row-size=16)
# . save EAX
50/push-EAX
# . EAX = get-or-insert(segments, seg-name, row-size=16)
# . . push args
68/push 0x10/imm32/row-size
52/push-EDX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call get-or-insert/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . EDX = EAX
89/copy 3/mod/direct 2/rm32/EDX . . . 0/r32/EAX . . # copy EAX to EDX
# . restore EAX
58/pop-to-EAX
# EBX = label-seg->address
8b/copy 0/mod/indirect 2/rm32/EDX . . . 3/r32/EBX . . # copy *EDX to EBX
# EBX += lrow->segment-offset
03/add 1/mod/*+disp8 0/rm32/EAX . . . 3/r32/EBX 8/disp8 . # add *(EAX+8) to EBX
# lrow->address = EBX
89/copy 1/mod/*+disp8 0/rm32/EAX . . . 3/r32/EBX 0xc/disp8 . # copy EBX to *(EAX+12)
# trace-sssns("label " lrow->key " is at address " lrow->address ".")
# . . push args
68/push "."/imm32
53/push-EBX
68/push "' is at address "/imm32
ff 6/subop/push 0/mod/indirect 0/rm32/EAX . . . . . . # push *EAX
68/push "label '"/imm32
# . . call
e8/call trace-sssns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# lrow += 16 # size of row
05/add-to-EAX 0x10/imm32
eb/jump $compute-addresses:label-loop/disp8
$compute-addresses:end:
# . restore registers
5f/pop-to-EDI
5e/pop-to-ESI
5b/pop-to-EBX
5a/pop-to-EDX
59/pop-to-ECX
58/pop-to-EAX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-compute-addresses:
# input:
# segments:
# - 'a': {0x1000, 0, 5}
# - 'b': {0x2018, 5, 1}
# - 'c': {0x5444, 6, 12}
# labels:
# - 'l1': {'a', 3, 0}
# - 'l2': {'b', 0, 0}
#
# trace contains in any order (comments in parens):
# segment 'a' starts at address 0x00001094. (0x34 + 0x20 for each segment)
# segment 'b' starts at address 0x00002099. (0x018 discarded)
# segment 'c' starts at address 0x0000509a. (0x444 discarded)
# label 'l1' is at address 0x00001097. (0x1094 + segment-offset 3)
# label 'l2' is at address 0x00002099. (0x2099 + segment-offset 0)
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . var segments/ECX = stream(10 * 16)
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 0xa0/imm32 # subtract from ESP
68/push 0xa0/imm32/length
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX
# . var labels/EDX = stream(512 * 16)
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 0x2000/imm32 # subtract from ESP
68/push 0x2000/imm32/length
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/EDX . . . 4/r32/ESP . . # copy ESP to EDX
# . stream-add4(segments, "a", 0x1000, 0, 5)
68/push 5/imm32/segment-size
68/push 0/imm32/file-offset
68/push 0x1000/imm32/start-address
68/push "a"/imm32/segment-name
51/push-ECX
# . . call
e8/call stream-add4/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# . stream-add4(segments, "b", 0x2018, 5, 1)
68/push 1/imm32/segment-size
68/push 5/imm32/file-offset
68/push 0x2018/imm32/start-address
68/push "b"/imm32/segment-name
51/push-ECX
# . . call
e8/call stream-add4/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# . stream-add4(segments, "c", 0x5444, 6, 12)
68/push 0xc/imm32/segment-size
68/push 6/imm32/file-offset
68/push 0x5444/imm32/start-address
68/push "c"/imm32/segment-name
51/push-ECX
# . . call
e8/call stream-add4/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# . stream-add4(labels, "l1", "a", 3, 0)
68/push 0/imm32/label-address
68/push 3/imm32/segment-offset
68/push "a"/imm32/segment-name
68/push "l1"/imm32/label-name
52/push-EDX
# . . call
e8/call stream-add4/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# . stream-add4(labels, "l2", "b", 0, 0)
68/push 0/imm32/label-address
68/push 0/imm32/segment-offset
68/push "b"/imm32/segment-name
68/push "l2"/imm32/label-name
52/push-EDX
# . . call
e8/call stream-add4/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# component under test
# . compute-addresses(segments, labels)
# . . push args
52/push-EDX
51/push-ECX
# . . call
e8/call compute-addresses/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# checks
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
# . check-trace-contains("segment 'a' starts at address 0x00001094.", msg)
# . . push args
68/push "F - test-compute-addresses/0"/imm32
68/push "segment 'a' starts at address 0x00001094."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("segment 'b' starts at address 0x00002099.", msg)
# . . push args
68/push "F - test-compute-addresses/1"/imm32
68/push "segment 'b' starts at address 0x00002099."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("segment 'c' starts at address 0x0000509a.", msg)
# . . push args
68/push "F - test-compute-addresses/2"/imm32
68/push "segment 'c' starts at address 0x0000509a."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("label 'l1' is at address 0x00001097.", msg)
# . . push args
68/push "F - test-compute-addresses/3"/imm32
68/push "label 'l1' is at address 0x00001097."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . check-trace-contains("label 'l2' is at address 0x00002099.", msg)
# . . push args
68/push "F - test-compute-addresses/4"/imm32
68/push "label 'l2' is at address 0x00002099."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
emit-output: # in : (address buffered-file), out : (address buffered-file), segments : (address stream {string, segment-info}), labels : (address stream {string, label-info})
# pseudocode:
# emit-headers(out, segments, labels)
# emit-segments(in, out, segments, labels)
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# emit-headers(out, segments, labels)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20)
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
# . . call
e8/call emit-headers/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# emit-segments(in, out, segments, labels)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20)
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call emit-segments/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x10/imm32 # add to ESP
$emit-output:end:
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
emit-segments: # in : (address buffered-file), out : (address buffered-file), segments : (address stream {string, segment-info}), labels : (address stream {string, label-info})
# pseudocode:
# var offset-of-next-instruction = 0
# var line = new-stream(512, 1)
# line-loop:
# while true
# clear-stream(line)
# read-line-buffered(in, line)
# if (line->write == 0) break # end of file
# offset-of-next-instruction += num-bytes(line)
# while true
# var word-slice = next-word(line)
# if slice-empty?(word-slice) # end of line
# break
# if slice-starts-with?(word-slice, "#") # comment
# break
# if is-label?(word-slice) # no need for label declarations anymore
# goto line-loop # don't insert empty lines
# if slice-equal?(word-slice, "==") # no need for segment header lines
# goto line-loop # don't insert empty lines
# if length(word-slice) == 2
# write-slice-buffered(out, word-slice)
# write-buffered(out, " ")
# continue
# datum = next-token-from-slice(word-slice->start, word-slice->end, "/")
# info = get-or-insert-slice(labels, datum)
# if has-metadata?(word-slice, "imm8")
# abort # label should never go to imm8
# else if has-metadata?(word-slice, "imm32")
# emit(out, info->address, 4)
# else if has-metadata?(word-slice, "disp8")
# value = info->offset - offset-of-next-instruction
# emit(out, value, 1)
# else if has-metadata?(word-slice, "disp32")
# value = info->offset - offset-of-next-instruction
# emit(out, value, 4)
# else
# abort
# write-buffered(out, "\n")
#
# registers:
# line: ECX
# word-slice: EDX
# offset-of-next-instruction: EBX
# datum: EDI
# info: ESI (inner loop only)
# temporaries: EAX, ESI (outer loop)
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
50/push-EAX
51/push-ECX
52/push-EDX
53/push-EBX
56/push-ESI
57/push-EDI
# var line/ECX : (address stream byte) = stream(512)
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 0x200/imm32 # subtract from ESP
68/push 0x200/imm32/length
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX
# var word-slice/EDX = {0, 0}
68/push 0/imm32/end
68/push 0/imm32/start
89/copy 3/mod/direct 2/rm32/EDX . . . 4/r32/ESP . . # copy ESP to EDX
# var datum/EDI = {0, 0}
68/push 0/imm32/end
68/push 0/imm32/start
89/copy 3/mod/direct 7/rm32/EDI . . . 4/r32/ESP . . # copy ESP to EDI
# offset-of-next-instruction/EBX = 0
31/xor 3/mod/direct 3/rm32/EBX . . . 3/r32/EBX . . # clear EBX
$emit-segments:line-loop:
# clear-stream(line)
# . . push args
51/push-ECX
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# read-line-buffered(in, line)
# . . push args
51/push-ECX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call read-line-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # dump line {{{
#? # . write(2/stderr, "LL: ")
#? # . . push args
#? 68/push "LL: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # write-stream(2/stderr, line)
#? # . . push args
#? 51/push-ECX
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . rewind-stream(line)
#? # . . push args
#? 51/push-ECX
#? # . . call
#? e8/call rewind-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
#? # }}}
$emit-segments:check0:
# if (line->write == 0) break
81 7/subop/compare 0/mod/indirect 1/rm32/ECX . . . . . 0/imm32 # compare *ECX
0f 84/jump-if-equal $emit-segments:end/disp32
# offset-of-next-instruction += num-bytes(line)
# . EAX = num-bytes(line)
# . . push args
51/push-ECX
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . EBX = EAX
89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX
$emit-segments:word-loop:
# next-word(line, word-slice)
# . . push args
52/push-EDX
51/push-ECX
# . . call
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # dump word-slice {{{
#? # . write(2/stderr, "w: ")
#? # . . push args
#? 68/push "w: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write-slice-buffered(Stderr, word-slice)
#? # . . push args
#? 52/push-EDX
#? 68/push Stderr/imm32
#? # . . call
#? e8/call write-slice-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
$emit-segments:check1:
# if (slice-empty?(word-slice)) break
# . EAX = slice-empty?(word-slice)
# . . push args
52/push-EDX
# . . call
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . if (EAX != 0) break
3d/compare-EAX-and 0/imm32
0f 85/jump-if-not-equal $emit-segments:next-line/disp32
$emit-segments:check-for-comment:
# if (slice-starts-with?(word-slice, "#")) break
# . start/ESI = word-slice->start
8b/copy 0/mod/indirect 2/rm32/EDX . . . 6/r32/ESI . . # copy *EDX to ESI
# . c/EAX = *start
31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX
8a/copy-byte 0/mod/indirect 6/rm32/ESI . . . 0/r32/AL . . # copy byte at *ESI to AL
# . if (EAX == '#') break
3d/compare-EAX-and 0x23/imm32/hash
0f 84/jump-if-equal $emit-segments:next-line/disp32
$emit-segments:check-for-label:
# if is-label?(word-slice) break
# . EAX = is-label?(word-slice)
# . . push args
52/push-EDX
# . . call
e8/call is-label?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . if (EAX != 0) break
3d/compare-EAX-and 0/imm32
0f 85/jump-if-not-equal $emit-segments:line-loop/disp32
$emit-segments:check-for-segment-header:
# if (slice-equal?(word-slice, "==")) break
# . EAX = slice-equal?(word-slice, "==")
# . . push args
68/push "=="/imm32
52/push-EDX
# . . call
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . if (EAX != 0) break
3d/compare-EAX-and 0/imm32
0f 85/jump-if-not-equal $emit-segments:line-loop/disp32
$emit-segments:2-character:
# if (length(word-slice) != 2) goto next check
# . EAX = length(word-slice)
8b/copy 1/mod/*+disp8 2/rm32/EDX . . . 0/r32/EAX 4/disp8 . # copy *(EDX+4) to EAX
2b/subtract 0/mod/indirect 2/rm32/EDX . . . 0/r32/EAX . . # subtract *EDX from EAX
# . if (EAX != 2) goto next check
3d/compare-EAX-and 2/imm32
75/jump-if-not-equal $emit-segments:check-metadata/disp8
# write-slice-buffered(out, word-slice)
# . . push args
52/push-EDX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
# . . call
e8/call write-slice-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# write-buffered(out, " ")
# . . push args
68/push " "/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
# . . call
e8/call write-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# continue
e9/jump $emit-segments:word-loop/disp32
$emit-segments:check-metadata:
# - if we get here, 'word-slice' must be a label to be looked up
# datum/EDI = next-token-from-slice(word-slice->start, word-slice->end, "/")
# . . push args
57/push-EDI
68/push 0x2f/imm32/slash
ff 6/subop/push 1/mod/*+disp8 2/rm32/EDX . . . . 4/disp8 . # push *(EDX+4)
ff 6/subop/push 0/mod/indirect 2/rm32/EDX . . . . . . # push *EDX
# . . call
e8/call next-token-from-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x10/imm32 # add to ESP
#? # dump word-slice {{{
#? # . write(2/stderr, "datum: ")
#? # . . push args
#? 68/push "datum: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write-slice-buffered(Stderr, word-slice)
#? # . . push args
#? 57/push-EDI
#? 68/push Stderr/imm32
#? # . . call
#? e8/call write-slice-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
# info/ESI = get-or-insert-slice(labels, datum, row-size=16)
# . EAX = get-or-insert-slice(labels, datum, row-size=16)
# . . push args
68/push 0x10/imm32/row-size
57/push-EDI
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20)
# . . call
e8/call get-or-insert-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . ESI = EAX
89/copy 3/mod/direct 6/rm32/ESI . . . 0/r32/EAX . . # copy EAX to ESI
$emit-segments:check-for-imm8:
# if (has-metadata?(word-slice, "imm8")) abort
# . EAX = has-metadata?(EDX, "imm8")
# . . push args
68/push "imm8"/imm32
52/push-EDX
# . . call
e8/call has-metadata?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . if (EAX != 0) abort
3d/compare-EAX-and 0/imm32
0f 85/jump-if-not-equal $emit-segments:imm8-abort/disp32
$emit-segments:check-for-imm32:
# if (!has-metadata?(word-slice, "imm32")) goto next check
# . EAX = has-metadata?(EDX, "imm32")
# . . push args
68/push "imm32"/imm32
52/push-EDX
# . . call
e8/call has-metadata?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . if (EAX == 0) goto next check
3d/compare-EAX-and 0/imm32
74/jump-if-equal $emit-segments:check-for-disp8/disp8
#? # dump info->address {{{
#? # . write(2/stderr, "info->address: ")
#? # . . push args
#? 68/push "info->address: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . print-int32-buffered(Stderr, info->address)
#? # . . push args
#? ff 6/subop/push 1/mod/*+disp8 6/rm32/ESI . . . . 8/disp8 . # push *(ESI+8)
#? 68/push Stderr/imm32
#? # . . call
#? e8/call print-int32-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
# emit-hex(out, info->address, 4)
# . . push args
68/push 4/imm32
ff 6/subop/push 1/mod/*+disp8 6/rm32/ESI . . . . 8/disp8 . # push *(ESI+8)
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
# . . call
e8/call emit-hex/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# continue
e9/jump $emit-segments:word-loop/disp32
$emit-segments:check-for-disp8:
# if (!has-metadata?(word-slice, "disp8")) goto next check
# . EAX = has-metadata?(EDX, "disp8")
# . . push args
68/push "disp8"/imm32
52/push-EDX
# . . call
e8/call has-metadata?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . if (EAX == 0) goto next check
3d/compare-EAX-and 0/imm32
74/jump-if-equal $emit-segments:check-for-disp32/disp8
# emit-hex(out, info->offset - offset-of-next-instruction, 1)
# . . push args
68/push 1/imm32
8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 0/r32/EAX 4/disp8 . # copy *(ESI+4) to EAX
29/subtract 3/mod/direct 0/rm32/EAX . . . 3/r32/EBX . . # subtract EBX from EAX
50/push-EAX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
# . . call
e8/call emit-hex/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# continue
e9/jump $emit-segments:word-loop/disp32
$emit-segments:check-for-disp32:
# if (!has-metadata?(word-slice, "disp32")) abort
# . EAX = has-metadata?(EDX, "disp32")
# . . push args
68/push "disp32"/imm32
52/push-EDX
# . . call
e8/call has-metadata?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . if (EAX == 0) abort
3d/compare-EAX-and 0/imm32
74/jump-if-equal $emit-segments:abort/disp8
# emit-hex(out, info->offset - offset-of-next-instruction, 4)
# . . push args
68/push 4/imm32
8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 0/r32/EAX 4/disp8 . # copy *(ESI+4) to EAX
29/subtract 3/mod/direct 0/rm32/EAX . . . 3/r32/EBX . . # subtract EBX from EAX
50/push-EAX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
# . . call
e8/call emit-hex/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# continue
e9/jump $emit-segments:word-loop/disp32
$emit-segments:next-line:
# write-buffered(out, "\n")
# . . push args
68/push Newline/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
# . . call
e8/call write-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# loop
e9/jump $emit-segments:line-loop/disp32
$emit-segments:end:
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x21c/imm32 # add to ESP
# . restore registers
5f/pop-to-EDI
5e/pop-to-ESI
5b/pop-to-EBX
5a/pop-to-EDX
59/pop-to-ECX
58/pop-to-EAX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
$emit-segments:imm8-abort:
# . _write(2/stderr, error)
# . . push args
68/push "emit-segments: unexpected /imm8"/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . syscall(exit, 1)
bb/copy-to-EBX 1/imm32
b8/copy-to-EAX 1/imm32/exit
cd/syscall 0x80/imm8
# never gets here
$emit-segments:abort:
# print(stderr, "missing metadata in " word-slice)
# . _write(2/stderr, "missing metadata in word ")
# . . push args
68/push "emit-segments: missing metadata in "/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write-slice-buffered(Stderr, word-slice)
# . . push args
52/push-EDX
68/push Stderr/imm32
# . . call
e8/call write-slice-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . flush(Stderr)
# . . push args
68/push Stderr/imm32
# . . call
e8/call flush/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . syscall(exit, 1)
bb/copy-to-EBX 1/imm32
b8/copy-to-EAX 1/imm32/exit
cd/syscall 0x80/imm8
# never gets here
test-emit-segments:
# input:
# in:
# == code 0x1000
# ab cd ef gh
# ij x/imm32
# == data 0x2000
# 00
# x:
# 34
# segments:
# - 'code': {0x1074, 0, 5}
# - 'data': {0x2079, 5, 1}
# labels:
# - 'l1': {'code', 3, 0x1077}
# - 'x': {'data', 1, 0x207a}
#
# output:
# ab cd ef gh
# ij 7a 20 00 00
# 00
# 34
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-input-buffered-file+4)
# . . push args
b8/copy-to-EAX _test-input-buffered-file/imm32
05/add-to-EAX 4/imm32
50/push-EAX
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-buffered-file+4)
# . . push args
b8/copy-to-EAX _test-output-buffered-file/imm32
05/add-to-EAX 4/imm32
50/push-EAX
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . var segments/ECX = stream(10 * 16)
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 0xa0/imm32 # subtract from ESP
68/push 0xa0/imm32/length
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX
# . var labels/EDX = stream(512 * 16)
81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 0x2000/imm32 # subtract from ESP
68/push 0x2000/imm32/length
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/EDX . . . 4/r32/ESP . . # copy ESP to EDX
# initialize input
# . write(_test-input-stream, "== code 0x1000\n")
# . . push args
68/push "== code 0x1000\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "ab cd ef gh\n")
# . . push args
68/push "ab cd ef gh\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "ij x/imm32\n")
# . . push args
68/push "ij x/imm32\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "== data 0x2000\n")
# . . push args
68/push "== data 0x2000\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "00\n")
# . . push args
68/push "00\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "x:\n")
# . . push args
68/push "x:\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . write(_test-input-stream, "34\n")
# . . push args
68/push "34\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . stream-add4(segments, "code", 0x1074, 0, 5)
68/push 5/imm32/segment-size
68/push 0/imm32/file-offset
68/push 0x1074/imm32/start-address
68/push "code"/imm32/segment-name
51/push-ECX
# . . call
e8/call stream-add4/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# . stream-add4(segments, "data", 0x2079, 5, 1)
68/push 1/imm32/segment-size
68/push 5/imm32/file-offset
68/push 0x2079/imm32/start-address
68/push "data"/imm32/segment-name
51/push-ECX
# . . call
e8/call stream-add4/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# . stream-add4(labels, "l1", "code", 3, 0x1077)
68/push 0x1077/imm32/label-address
68/push 3/imm32/segment-offset
68/push "code"/imm32/segment-name
68/push "l1"/imm32/label-name
52/push-EDX
# . . call
e8/call stream-add4/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# . stream-add4(labels, "x", "data", 1, 0x207a)
68/push 0x207a/imm32/label-address
68/push 1/imm32/segment-offset
68/push "data"/imm32/segment-name
68/push "x"/imm32/label-name
52/push-EDX
# . . call
e8/call stream-add4/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
# component under test
# . emit-segments(_test-input-buffered-file, _test-output-buffered-file, segments, labels)
# . . push args
52/push-EDX
51/push-ECX
68/push _test-output-buffered-file/imm32
68/push _test-input-buffered-file/imm32
# . . call
e8/call emit-segments/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x10/imm32 # add to ESP
# checks
#? # dump output {{{
#? # . write(2/stderr, "result: ^")
#? # . . push args
#? 68/push "result: ^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write-stream(2/stderr, _test-output-stream)
#? # . . push args
#? 68/push _test-output-stream/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . rewind-stream(_test-output-stream)
#? # . . push args
#? 68/push _test-output-stream/imm32
#? # . . call
#? e8/call rewind-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
#? # }}}
# . check-next-stream-line-equal(_test-output-stream, "ab cd ef gh ", msg)
# . . push args
68/push "F - test-emit-segments/0"/imm32
68/push "ab cd ef gh "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . check-next-stream-line-equal(_test-output-stream, "ij 7a 20 00 00 ", msg)
# . . push args
68/push "F - test-emit-segments/1"/imm32
68/push "ij 7a 20 00 00 "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . check-next-stream-line-equal(_test-output-stream, "00 ", msg)
# . . push args
68/push "F - test-emit-segments/2"/imm32
68/push "00 "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . check-next-stream-line-equal(_test-output-stream, "34 ", msg)
# . . push args
68/push "F - test-emit-segments/3"/imm32
68/push "34 "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
emit-headers: # out : (address buffered-file), segments : (address stream {string, segment-info}), labels : (address stream {string, label-info})
# pseudocode:
# emit-elf-header(out, segments, labels)
# curr-segment = segments->data
# max = segments->data + segments->write
# while true
# if (curr-segment >= max) break
# emit-elf-program-header-entry(curr-segment)
# curr-segment += 20 # size of a row
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
50/push-EAX
51/push-ECX
# emit-elf-header(out, segments, labels)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call emit-elf-header/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# EAX = segments
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 0/r32/EAX 8/disp8 . # copy *(EBP+8) to EAX
# ECX = segments->write
8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX
# curr-segment/EAX = segments->data
8d/copy-address 1/mod/*+disp8 0/rm32/EAX . . . 0/r32/EAX 0xc/disp8 . # copy EAX+12 to EAX
# max/ECX = segments->data + segments->write
01/add 3/mod/direct 1/rm32/ECX . . . 0/r32/EAX . . # add EAX to ECX
$emit-headers:loop:
# if (curr-segment >= max) break
39/compare 3/mod/direct 0/rm32/EAX . . . 1/r32/ECX . . # compare EAX with ECX
73/jump-if-greater-or-equal-unsigned $emit-headers:end/disp8
# emit-elf-program-header-entry(curr-segment)
# . . push args
50/push-EAX
# . . call
e8/call emit-elf-program-header-entry/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# curr-segment += 20 # size of a row
81 0/subop/add 3/mod/direct 0/rm32/EAX . . . . . 0x14/imm32 # add to EAX
eb/jump $emit-headers:loop/disp8
$emit-headers:end:
# . restore registers
59/pop-to-ECX
58/pop-to-EAX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
emit-elf-header: # out : (address buffered-file), segments : (address stream {string, segment-info}), labels : (address stream {string, label-info})
# pseudocode
# *Elf_e_entry = get-or-insert(labels, "Entry")->address
# *Elf_e_phnum = segments->write / 20 # size of a row
# emit-hex-array(out, Elf_header)
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
50/push-EAX
51/push-ECX
52/push-EDX # just because we need to call idiv
# *Elf_e_entry = get-or-insert(labels, "Entry")->address
# . EAX = labels
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 0/r32/EAX 0x10/disp8 . # copy *(EBP+16) to EAX
# . label-info/EAX = get-or-insert(labels, "Entry", row-size=16)
# . . push args
68/push 0x10/imm32/row-size
68/push "Entry"/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
# . . call
e8/call get-or-insert/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . EAX = label-info->address
8b/copy 1/mod/*+disp8 0/rm32/EAX . . . 0/r32/EAX 8/disp8 . # copy *(EAX+8) to EAX
# . *Elf_e_entry = EAX
89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Elf_e_entry/disp32 # copy EAX to *Elf_e_entry
# *Elf_e_phnum = segments->write / 0x20
# . EAX = segments
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 0/r32/EAX 0xc/disp8 . # copy *(EBP+12) to EAX
# . len/EAX = segments->write
8b/copy 0/mod/indirect 0/rm32/EAX . . . 0/r32/EAX . . # copy *EAX to EAX
# . EAX = len / 0x20 (destroying EDX)
b9/copy-to-ECX 0x20/imm32
31/xor 3/mod/direct 2/rm32/EDX . . . 2/r32/EDX . . # clear EDX
f7 7/subop/idiv 3/mod/direct 1/rm32/ECX . . . . . . # divide EDX:EAX by ECX, storing quotient in EAX and remainder in EDX
# . *Elf_e_phnum = EAX
89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Elf_e_phnum/disp32 # copy EAX to *Elf_e_phnum
# emit-hex-array(out, Elf_header)
# . . push args
68/push Elf_header/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call emit-hex-array/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
$emit-elf-header:end:
# . restore registers
5a/pop-to-EDX
59/pop-to-ECX
58/pop-to-EAX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
emit-elf-program-header-entry: # curr-segment : {string, segment-info}
# pseudocode:
# *Elf_p_offset = curr-segment->file-offset
# *Elf_p_vaddr = curr-segment->address
# *Elf_p_paddr = curr-segment->address
# *Elf_p_filesz = curr-segment->size
# *Elf_p_memsz = curr-segment->size
# if curr-segment->name == "code"
# *Elf_p_flags = 5 # r-x
# else
# *Elf_p_flags = 6 # rw-
# emit-hex-array(out, Elf_program_header_entry)
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
50/push-EAX
56/push-ESI
# ESI = curr-segment
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 0/r32/EAX 8/disp8 . # copy *(EBP+8) to EAX
# *Elf_p_offset = curr-segment->file-offset
# . EAX = curr-segment->file-offset
8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 0/r32/EAX 8/disp8 . # copy *(ESI+8) to EAX
# . *Elf_p_offset = EAX
89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Elf_p_offset/disp32 # copy EAX to *Elf_p_offset
# *Elf_p_vaddr = curr-segment->address
# . EAX = curr-segment->address
8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 0/r32/EAX 4/disp8 . # copy *(ESI+4) to EAX
# . *Elf_p_vaddr = EAX
89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Elf_p_vaddr/disp32 # copy EAX to *Elf_p_vaddr
# *Elf_p_paddr = curr-segment->address
89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Elf_p_paddr/disp32 # copy EAX to *Elf_p_paddr
# *Elf_p_filesz = curr-segment->size
# . EAX = curr-segment->size
8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 0/r32/EAX 0xc/disp8 . # copy *(ESI+12) to EAX
# . *Elf_p_filesz = EAX
89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Elf_p_filesz/disp32 # copy EAX to *Elf_p_filesz
# *Elf_p_memsz = curr-segment->size
89/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Elf_p_memsz/disp32 # copy EAX to *Elf_p_memsz
# if (!string-equal?(curr-segment->name, "code") goto next check
# . EAX = curr-segment->name
8b/copy 0/mod/indirect 6/rm32/ESI . . . 0/r32/EAX . . # copy *ESI to EAX
# . EAX = string-equal?(curr-segment->name, "code")
# . . push args
68/push "code"/imm32
50/push-EAX
# . . call
e8/call string-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . if (EAX == 0) goto next check
3d/compare-EAX-and 0/imm32
74/jump-if-equal $emit-elf-program-header-entry:data/disp8
# *Elf_p_flags = rw-
c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 . . . Elf_p_flags/disp32 6/imm32 # copy to *Elf_p_flags
$emit-elf-program-header-entry:data:
# otherwise *Elf_p_flags = r-x
c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 . . . Elf_p_flags/disp32 5/imm32 # copy to *Elf_p_flags
# emit-hex-array(out, Elf_program_header_entry)
# . . push args
68/push Elf_program_header_entry/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call emit-hex-array/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
$emit-elf-program-header-entry:end:
# . restore registers
5e/pop-to-ESI
58/pop-to-EAX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
# - some helpers for tests
stream-add4: # in : (address stream byte), key : address, val1 : address, val2 : address, val3 : address
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
50/push-EAX
51/push-ECX
52/push-EDX
56/push-ESI
# ESI = in
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 6/r32/ESI 8/disp8 . # copy *(EBP+8) to ESI
# curr/EAX = in->data + in->write
# . EAX = in->write
8b/copy 0/mod/indirect 6/rm32/ESI . . . 0/r32/EAX . . # copy *ESI to EAX
# . EAX = ESI+EAX+12
8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/ESI 0/index/EAX . 0/r32/EAX 0xc/disp8 . # copy ESI+EAX+12 to EAX
# max/EDX = in->data + in->length
# . EDX = in->length
8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 2/r32/EDX 8/disp8 . # copy *(ESI+8) to EDX
# . EDX = ESI+EDX+12
8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/ESI 2/index/EDX . 2/r32/EDX 0xc/disp8 . # copy ESI+EDX+12 to EDX
# if (curr >= max) abort
39/compare 3/mod/direct 0/rm32/EAX . . . 2/r32/EDX . . # compare EAX with EDX
73/jump-if-greater-or-equal-unsigned $stream-add4:abort/disp8
# *curr = key
8b/copy 1/mod/*+disp8 5/rm32/EBP . . 1/r32/ECX 0xc/disp8 . # copy *(EBP+12) to ECX
89/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy ECX to *EAX
# curr += 4
05/add-to-EAX 4/imm32
# if (curr >= max) abort
39/compare 3/mod/direct 0/rm32/EAX . . . 2/r32/EDX . . # compare EAX with EDX
73/jump-if-greater-or-equal-unsigned $stream-add4:abort/disp8
# *curr = val1
8b/copy 1/mod/*+disp8 5/rm32/EBP . . 1/r32/ECX 0x10/disp8 . # copy *(EBP+16) to ECX
89/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy ECX to *EAX
# curr += 4
05/add-to-EAX 4/imm32
# if (curr >= max) abort
39/compare 3/mod/direct 0/rm32/EAX . . . 2/r32/EDX . . # compare EAX with EDX
73/jump-if-greater-or-equal-unsigned $stream-add4:abort/disp8
# *curr = val2
8b/copy 1/mod/*+disp8 5/rm32/EBP . . 1/r32/ECX 0x14/disp8 . # copy *(EBP+20) to ECX
89/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy ECX to *EAX
# curr += 4
05/add-to-EAX 4/imm32
# if (curr >= max) abort
39/compare 3/mod/direct 0/rm32/EAX . . . 2/r32/EDX . . # compare EAX with EDX
73/jump-if-greater-or-equal-unsigned $stream-add4:abort/disp8
# *curr = val3
8b/copy 1/mod/*+disp8 5/rm32/EBP . . 1/r32/ECX 0x18/disp8 . # copy *(EBP+24) to ECX
89/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy ECX to *EAX
# in->write += 16
81 0/subop/add 0/mod/indirect 6/rm32/ESI . . . . . 0x10/imm32 # add to *ESI
$stream-add4:end:
# . restore registers
5e/pop-to-ESI
5a/pop-to-EDX
59/pop-to-ECX
58/pop-to-EAX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
$stream-add4:abort:
# . _write(2/stderr, error)
# . . push args
68/push "overflow in stream-add4\n"/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . syscall(exit, 1)
bb/copy-to-EBX 1/imm32
b8/copy-to-EAX 1/imm32/exit
cd/syscall 0x80/imm8
# never gets here
# some variants of 'trace' that take multiple arguments in different combinations of types:
# n: int
# c: character [4-bytes, will eventually be UTF-8]
# s: (address string)
# l: (address slice)
# one gotcha: 's5' must not be empty
trace-sssns: # s1 : (address string), s2 : (address string), s3 : (address string), n4 : int, s5 : (address string)
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# write(*Trace-stream, s1)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# write(*Trace-stream, s2)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# write(*Trace-stream, s3)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# print-int32(*Trace-stream, n4)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call print-int32/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# trace(s5) # implicitly adds a newline and finalizes the trace line
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x18/disp8 . # push *(EBP+24)
# . . call
e8/call trace/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
$trace-sssns:end:
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-trace-sssns:
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . *Trace-stream->write = 0
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Trace-stream/disp32 # copy *Trace-stream to EAX
c7 0/subop/copy 0/mod/direct 0/rm32/EAX . . . . . 0/imm32 # clear *EAX
# trace-sssns("A" "b" "c " 3 " e")
# . . push args
68/push " e"/imm32
68/push 3/imm32
68/push "c "/imm32
68/push "b"/imm32
68/push "A"/imm32
# . . call
e8/call trace-sssns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
# check-trace-contains("Abc 0x00000003 e")
# . . push args
68/push "F - test-trace-sssns"/imm32
68/push "Abc 0x00000003 e"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
trace-snsns: # s1 : (address string), n2 : int, s3 : (address string), n4 : int, s5 : (address string)
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# write(*Trace-stream, s1)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# print-int32(*Trace-stream, n2)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call print-int32/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# write(*Trace-stream, s3)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# print-int32(*Trace-stream, n4)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call print-int32/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# trace(s5) # implicitly adds a newline and finalizes the trace line
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x18/disp8 . # push *(EBP+24)
# . . call
e8/call trace/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
$trace-snsns:end:
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-trace-snsns:
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . *Trace-stream->write = 0
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Trace-stream/disp32 # copy *Trace-stream to EAX
c7 0/subop/copy 0/mod/direct 0/rm32/EAX . . . . . 0/imm32 # clear *EAX
# trace-snsns("A " 2 " c " 3 " e")
# . . push args
68/push " e"/imm32
68/push 3/imm32
68/push " c "/imm32
68/push 2/imm32
68/push "A "/imm32
# . . call
e8/call trace-snsns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
# check-trace-contains("Abc 0x00000003 e")
# . . push args
68/push "F - test-trace-snsns"/imm32
68/push "A 0x00000002 c 0x00000003 e"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
trace-slsls: # s1 : (address string), l2 : (address slice), s3 : (address string), l4 : (address slice), s5 : (address string)
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# write(*Trace-stream, s1)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# write-slice(*Trace-stream, l2)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# write(*Trace-stream, s3)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# write-slice(*Trace-stream, l4)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# trace(s5) # implicitly adds a newline and finalizes the trace line
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x18/disp8 . # push *(EBP+24)
# . . call
e8/call trace/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
$trace-slsls:end:
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-trace-slsls:
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . *Trace-stream->write = 0
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Trace-stream/disp32 # copy *Trace-stream to EAX
c7 0/subop/copy 0/mod/direct 0/rm32/EAX . . . . . 0/imm32 # clear *EAX
# (EAX..ECX) = "b"
b8/copy-to-EAX "b"/imm32
8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX
8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX
05/add-to-EAX 4/imm32
# var b/EBX : (address slice) = {EAX, ECX}
51/push-ECX
50/push-EAX
89/copy 3/mod/direct 3/rm32/EBX . . . 4/r32/ESP . . # copy ESP to EBX
# (EAX..ECX) = "d"
b8/copy-to-EAX "d"/imm32
8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX
8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX
05/add-to-EAX 4/imm32
# var d/EDX : (address slice) = {EAX, ECX}
51/push-ECX
50/push-EAX
89/copy 3/mod/direct 2/rm32/EDX . . . 4/r32/ESP . . # copy ESP to EDX
# trace-slsls("A" b "c" d "e")
# . . push args
68/push "e"/imm32
52/push-EDX
68/push "c"/imm32
53/push-EBX
68/push "A"/imm32
# . . call
e8/call trace-slsls/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
# check-trace-contains("Abcde")
# . . push args
68/push "F - test-trace-slsls"/imm32
68/push "Abcde"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
trace-slsns: # s1 : (address string), l2 : (address slice), s3 : (address string), n4 : int, s5 : (address string)
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# write(*Trace-stream, s1)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# write-slice(*Trace-stream, l2)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# write(*Trace-stream, s3)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# print-int32(*Trace-stream, n4)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call print-int32/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# trace(s5) # implicitly adds a newline and finalizes the trace line
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x18/disp8 . # push *(EBP+24)
# . . call
e8/call trace/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
$trace-slsns:end:
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-trace-slsns:
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . *Trace-stream->write = 0
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/EAX Trace-stream/disp32 # copy *Trace-stream to EAX
c7 0/subop/copy 0/mod/direct 0/rm32/EAX . . . . . 0/imm32 # clear *EAX
# (EAX..ECX) = "b"
b8/copy-to-EAX "b"/imm32
8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX
8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX
05/add-to-EAX 4/imm32
# var b/EBX : (address slice) = {EAX, ECX}
51/push-ECX
50/push-EAX
89/copy 3/mod/direct 3/rm32/EBX . . . 4/r32/ESP . . # copy ESP to EBX
# trace-slsls("A" b "c " 3 " e")
# . . push args
68/push " e"/imm32
68/push 3/imm32
68/push "c "/imm32
53/push-EBX
68/push "A"/imm32
# . . call
e8/call trace-slsns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x14/imm32 # add to ESP
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
# check-trace-contains("Abc 0x00000003 e")
# . . push args
68/push "F - test-trace-slsls"/imm32
68/push "Abc 0x00000003 e"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
num-bytes: # line : (address stream) -> EAX : int
# pseudocode:
# result = 0
# while true
# var word-slice = next-word(line)
# if slice-empty?(word-slice) # end of line
# break
# if slice-starts-with?(word-slice, "#") # comment
# break
# if is-label?(word-slice) # no need for label declarations anymore
# break
# if slice-equal?(word-slice, "==")
# break # no need for segment header lines
# result += compute-width(word-slice)
# return result
#
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
51/push-ECX
52/push-EDX
53/push-EBX
# var result/EAX = 0
31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX
# var word-slice/ECX = {0, 0}
68/push 0/imm32/end
68/push 0/imm32/start
89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX
#? # dump line {{{
#? # . write(2/stderr, "LL: ")
#? # . . push args
#? 68/push "LL: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # write-stream(2/stderr, line)
#? # . . push args
#? ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
# . rewind-stream(line)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call rewind-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
$num-bytes:loop:
# next-word(line, word-slice)
# . . push args
51/push-ECX
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # dump word-slice {{{
#? # . write(2/stderr, "AA: ")
#? # . . push args
#? 68/push "AA: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . clear-stream(Stderr+4)
#? # . . save EAX
#? 50/push-EAX
#? # . . push args
#? b8/copy-to-EAX Stderr/imm32
#? 05/add-to-EAX 4/imm32
#? 50/push-EAX
#? # . . call
#? e8/call clear-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
#? # . . restore EAX
#? 58/pop-to-EAX
#? # . write-slice-buffered(Stderr, word-slice)
#? # . . push args
#? 51/push-ECX
#? 68/push Stderr/imm32
#? # . . call
#? e8/call write-slice-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
#? # }}}
$num-bytes:check0:
# if (slice-empty?(word-slice)) break
# . save result
50/push-EAX
# . EAX = slice-empty?(word-slice)
# . . push args
51/push-ECX
# . . call
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . if (EAX != 0) break
3d/compare-EAX-and 0/imm32
# . restore result now that ZF is set
58/pop-to-EAX
75/jump-if-not-equal $num-bytes:end/disp8
$num-bytes:check-for-comment:
# if (slice-starts-with?(word-slice, "#")) break
# . start/EDX = word-slice->start
8b/copy 0/mod/indirect 1/rm32/ECX . . . 2/r32/EDX . . # copy *ECX to EDX
# . c/EBX = *start
31/xor 3/mod/direct 3/rm32/EBX . . . 3/r32/EBX . . # clear EBX
8a/copy-byte 0/mod/indirect 2/rm32/EDX . . . 3/r32/BL . . # copy byte at *EDX to BL
# . if (EBX == '#') break
81 7/subop/compare 3/mod/direct 3/rm32/EBX . . . . . 0x23/imm32/hash # compare EBX
74/jump-if-equal $num-bytes:end/disp8
$num-bytes:check-for-label:
# if (slice-ends-with?(word-slice, ":")) break
# . end/EDX = word-slice->end
8b/copy 1/mod/*+disp8 1/rm32/ECX . . . 2/r32/EDX 4/disp8 . # copy *(ECX+4) to EDX
# . c/EBX = *(end-1)
31/xor 3/mod/direct 3/rm32/EBX . . . 3/r32/EBX . . # clear EBX
8a/copy-byte 1/mod/*+disp8 2/rm32/EDX . . . 3/r32/BL -1/disp8 . # copy byte at *ECX to BL
# . if (EBX == ':') break
81 7/subop/compare 3/mod/direct 3/rm32/EBX . . . . . 0x3a/imm32/colon # compare EBX
74/jump-if-equal $num-bytes:end/disp8
$num-bytes:check-for-segment-header:
# if (slice-equal?(word-slice, "==")) break
# . push result
50/push-EAX
# . EAX = slice-equal?(word-slice, "==")
# . . push args
68/push "=="/imm32
51/push-ECX
# . . call
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . if (EAX != 0) break
3d/compare-EAX-and 0/imm32
# . restore result now that ZF is set
58/pop-to-EAX
75/jump-if-not-equal $num-bytes:end/disp8
$num-bytes:loop-body:
# result += compute-width-of-slice(word-slice)
# . copy result to EDX
89/copy 3/mod/direct 2/rm32/EDX . . . 0/r32/EAX . . # copy EAX to EDX
# . EAX = compute-width-of-slice(word-slice)
# . . push args
51/push-ECX
# . . call
e8/call compute-width-of-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . EAX += result
01/add 3/mod/direct 0/rm32/EAX . . . 2/r32/EDX . . # add EDX to EAX
e9/jump $num-bytes:loop/disp32
$num-bytes:end:
# . rewind-stream(line)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8)
# . . call
e8/call rewind-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# . restore registers
5b/pop-to-EBX
5a/pop-to-EDX
59/pop-to-ECX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-num-bytes-handles-empty-string:
# if a line starts with '#', return 0
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# no contents in input
# EAX = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# check-ints-equal(EAX, 0, msg)
# . . push args
68/push "F - test-num-bytes-handles-empty-string"/imm32
68/push 0/imm32/true
50/push-EAX
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-num-bytes-ignores-comments:
# if a line starts with '#', return 0
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# initialize input
# . write(_test-input-stream, "# abcd")
# . . push args
68/push "# abcd"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# EAX = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# check-ints-equal(EAX, 0, msg)
# . . push args
68/push "F - test-num-bytes-ignores-comments"/imm32
68/push 0/imm32/true
50/push-EAX
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-num-bytes-ignores-labels:
# if the first word ends with ':', return 0
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# initialize input
# . write(_test-input-stream, "ab: # cd")
# . . push args
68/push "ab: # cd"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# EAX = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# check-ints-equal(EAX, 0, msg)
# . . push args
68/push "F - test-num-bytes-ignores-labels"/imm32
68/push 0/imm32/true
50/push-EAX
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-num-bytes-ignores-segment-headers:
# if the first word is '==', return 0
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# initialize input
# . write(_test-input-stream, "== ab cd")
# . . push args
68/push "== ab cd"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# EAX = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# check-ints-equal(EAX, 0, msg)
# . . push args
68/push "F - test-num-bytes-ignores-segment-headers"/imm32
68/push 0/imm32/true
50/push-EAX
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-num-bytes-counts-words-by-default:
# without metadata, count words
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# initialize input
# . write(_test-input-stream, "ab cd ef")
# . . push args
68/push "ab cd ef"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# EAX = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# check-ints-equal(EAX, 3, msg)
# . . push args
68/push "F - test-num-bytes-counts-words-by-default"/imm32
68/push 3/imm32/true
50/push-EAX
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-num-bytes-ignores-trailing-comment:
# trailing comments appropriately ignored
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# initialize input
# . write(_test-input-stream, "ab cd # ef")
# . . push args
68/push "ab cd # ef"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# EAX = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# check-ints-equal(EAX, 2, msg)
# . . push args
68/push "F - test-num-bytes-ignores-trailing-comment"/imm32
68/push 2/imm32/true
50/push-EAX
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-num-bytes-handles-imm32:
# if a word has the /imm32 metadata, count it as 4 bytes
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# initialize input
# . write(_test-input-stream, "ab cd/imm32 ef")
# . . push args
68/push "ab cd/imm32 ef"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
# EAX = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# check-ints-equal(EAX, 6, msg)
# . . push args
68/push "F - test-num-bytes-handles-imm32"/imm32
68/push 6/imm32/true
50/push-EAX
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
== data
Segment-size:
0x1000/imm32/4KB
# This block of bytes gets copied to the start of the output ELF file, with
# some fields filled in.
# http://www.sco.com/developers/gabi/latest/ch4.eheader.html
Elf_header:
# - length
0x34/imm32
# - data
$e_ident:
7f 45/E 4c/L 46/F
01/32-bit 01/little-endian 01/file-version 00/no-os-extensions
00 00 00 00 00 00 00 00 # 8 bytes of padding
$e_type:
02 00
$e_machine:
03 00
$e_version:
1/imm32
Elf_e_entry:
0x09000000/imm32 # approximate default; must be updated
$e_phoff:
0x34/imm32 # offset for the 'program header table' containing segment headers
$e_shoff:
0/imm32 # no sections
$e_flags:
0/imm32 # unused
$e_ehsize:
0x34 00
$e_phentsize:
0x20 00
Elf_e_phnum:
00 00 # number of segments; must be updated
$e_shentsize:
00 00 # no sections
$e_shnum:
00 00
$e_shstrndx:
00 00
# This block of bytes gets copied after the Elf_header once for each segment.
# Some fields need filling in each time.
# https://docs.oracle.com/cd/E19683-01/816-1386/chapter6-83432/index.html
Elf_program_header_entry:
# - length
0x20/imm32
# - data
$p_type:
1/imm32/PT_LOAD
Elf_p_offset:
0/imm32 # byte offset in the file at which a segment begins; must be updated
Elf_p_vaddr:
0/imm32 # starting address to store the segment at before running the program
Elf_p_paddr:
0/imm32 # should have same value as Elf_p_vaddr
Elf_p_filesz:
0/imm32
Elf_p_memsz:
0/imm32 # should have same value as Elf_p_filesz
Elf_p_flags:
6/imm32/rw- # read/write/execute permissions for the segment; must be updated for the code segment
$p_align:
# we hold this constant; changing it will require adjusting the way we
# compute the starting address for each segment
0x1000/imm32
# . . vim:nowrap:textwidth=0