themes/headache


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[colours]
bkgnd=default
titlebar=magenta
titlebar.text=white
titlebar.brackets=white
titlebar.unencrypted=black
titlebar.encrypted=cyan
titlebar.untrusted=yellow
titlebar.trusted=cyan
titlebar.online=white
titlebar.offline=black
titlebar.away=white
titlebar.chat=white
titlebar.dnd=black
titlebar.xa=white
statusbar=default
statusbar.text=white
statusbar.brackets=red
statusbar.active=cyan
statusbar.new=white
main.text=blue
main.text.me=white
main.text.them=bold_white
main.splash=red
main.time=green
input.text=yellow
subscribed=bold_magenta
unsubscribed=bold_black
otr.started.trusted=cyan
otr.started.untrusted=yellow
otr.ended=blue
otr.trusted=cyan
otr.untrusted=yellow
online=red
away=cyan
chat=green
dnd=megenta
xa=cyan
offline=green
incoming=yellow
typing=magenta
gone=yellow
error=red
roominfo=white
roommention=bold_green
me=white
them=white
roster.header=bold_cyan
occupants.header=bold_cyan
receipt.sent=red
# helpers for emitting traces to a trace stream, and for tests to check the trace stream
#
# A trace stream looks like this:
#   read : int  # index that we've read until
#   write : int  # index at which writes go
#   data : (array byte)  # prefixed by length as usual
# In a real trace the data will be in a special segment set aside for the purpose.
#
# primitives for operating on traces:
#   - initialize-trace-stream (update global variable)
#   - trace: stream, string
#   - die: stream (exit(1) if using real trace)
#   - check-trace-contains: stream, string/line, string/message (scans only from stream's read pointer, prints message to stderr on failure, updates stream's read pointer)
#   - rewind-reads: stream (resets read pointer)
#   - scan-to-next-line: stream (advance read pointer past next newline)
#
# Traces are very fundamental, so many of the helpers we create here won't be
# used elsewhere; we'll switch to more bounds-checked variants. But here we get
# bounds-checking for free; we allocate a completely disjoint segment for trace
# data, and overflowing it will generate a page fault.

== data

# We'll save the address of the trace segment here.
Trace-stream:
  00 00 00 00

# Fake trace-stream for tests.
# Also illustrates the layout of the real trace-stream (segment).
Test-trace-stream:
  # current write index
  00 00 00 00
  # current read index
  00 00 00 00
  # length (= 8)
  08 00 00 00
  # data
  00 00 00 00 00 00 00 00  # 8 bytes

== code

# instruction                     effective address                                                   operand     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

# main:  (manual test if this is the last file loaded)
  e8/call  run-tests/disp32  # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.
  # syscall(exit, Num-test-failures)
  8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           1/r32/EBX   Num-test-failures/disp32          # copy *Num-test-failures to EBX
  b8/copy-to-EAX  1/imm32
  cd/syscall  0x80/imm8

# Allocate a new segment for the trace stream, initialize its length, and save its address to Trace-stream.
# The Trace-stream segment will consist of variable-length lines separated by newlines (0x0a)
initialize-trace-stream:
  # EAX = new-segment(0x1000)
    # push arg
  68/push  0x1000/imm32/N
    # call
  e8/call  new-segment/disp32
    # discard arg
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
  # copy EAX to *Trace-stream
  89/copy                         0/mod/indirect  5/rm32/.disp32            .             .           0/r32/EAX   Trace-stream/disp32               # copy EAX to *Trace-stream
  # Trace-stream.length = 0x1000/N - 12
  c7          0/copy              1/mod/*+disp8   0/rm32/EAX    .           .             .           .           8/disp8         0xff4/imm32       # copy 0xff4 to *(EAX+8)
  c3/return

# Append to the given trace stream.
trace:  # t : (address trace-stream), line : string
  # 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
  # EAX = t
  8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none              0/r32/EAX   8/disp8         .                 # copy *(EBP+8) to EAX
  # EBX = line
  8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none              3/r32/EBX   0xc/disp8       .                 # copy *(EBP+12) to EBX
  # append line to t.data from t.write
  #
  # pseudocode:
  #   destend = &t.data[t.length]
  #   oldw = t.write
  #   if line.length == 0 return
  #   t.write += line.length + 1  # for newline
  #   dest = &t.data[oldw]
  #   srcend = &line.data[line.length]
  #   src = &line.data[0]
  #   while true:
  #     if src >= srcend break
  #     if dest >= destend break  # for now silently ignore filled up trace buffer
  #     *dest = *src
  #     ++src
  #     ++dest
  #   if dest >= destend return
  #   *dest = 10/newline
  #
  # key registers to set up for the loop:
  #   EAX/dest, ECX/destend, EBX/src, ESI/srcend
  # we save EDX for byte operations (has to be one of the first 4 registers)
  #
  # register setup before the loop:
  #   EAX = *(EBP+8)    # t
  #   EBX = *(EBP+12)   # line
  #   ECX = *(EAX+8)    # t.length
  #   ECX = EAX+12+ECX  # destend = &t.data[t.length]
  #   ESI = *EAX        # oldw = t.write
  #   EDX = *EBX        # line.length
  #   *EAX = *EAX + EDX # update t.write  (allowed to go past t.length)
  #                     # do this here just because it's convenient
  #   ++ *EAX  # for the newline
  #   EAX = EAX+12+ESI  # dest = &t.data[t.write]
  #   ESI = EBX+4+EDX   # srcend = &line.data[line.length]
  #   EBX = EBX+4       # src = &line.data[0]
  #
  # EAX/t and EBX/line are already initialized
  # ECX = t.length
  8b/copy                         1/mod/*+disp8   0/rm32/EAX    .           .             .           1/r32/ECX   8/disp8         .                 # copy *(EAX+8) to ECX
  # ECX/destend = &t.data[t.length]
  8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/EAX  1/index/ECX   .           1/r32/ECX   0xc/disp8       .                 # copy EAX+ECX+12 to ECX
  # ESI/oldw = t.write
  8b/copy                         0/mod/indirect  0/rm32/EAX    .           .             .           6/r32/ESI   .               .                 # copy *EAX to ESI
  # EDX = line.length
  8b/copy                         0/mod/indirect  3/rm32/EBX    .           .             .           2/r32/EDX   .               .                 # copy *EBX to EDX
  # if EDX == 0 return
  81          7/subop/compare     3/mod/direct    2/rm32/EDX    .           .             .           .           .               0/imm32           # compare EDX
  74/jump-if-equal  $trace:end/disp8
  # t.write += line.length
  01/add                          0/mod/indirect  0/rm32/EAX    .           .             .           2/r32/EDX   .               .                 # add EDX to *EAX
  # t.write++ (for the newline we'll append below)
  81          0/subop/add         0/mod/indirect  0/rm32/EAX    .           .             .           .           .               1/imm32           # add to *EAX
  # EAX/dest = &t.data[oldw]
  8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/EAX  6/index/ESI   .           0/r32/EAX   0xc/disp8       .                 # copy EAX+ESI+12 to EAX
  # ESI/srcend = &line.data[line.length]
  8d/copy-address                 1/mod/*+disp8   4/rm32/sib    3/base/EBX  2/index/EDX   .           6/r32/ESI   4/disp8         .                 # copy EBX+EDX+4 to ESI
  # EBX/src = &line.data
  81          0/subop/add         3/mod/direct    3/rm32/EBX    .           .             .           .           .               4/imm32           # add to EBX
  # while (true)
$trace:loop:
  # if EBX/src >= ESI/srcend break
  39/compare                      3/mod/direct    3/rm32/EBX    .           .             .           6/r32/ESI   .               .                 # compare EBX with ESI
  7d/jump-if-greater-or-equal  $trace:break/disp8
  # if EAX/dest >= ECX/destend break  (for now silently ignore filled up trace buffer)
  39/compare                      3/mod/direct    0/rm32/EAX    .           .             .           1/r32/ECX   .               .                 # compare EAX with ECX
  7d/jump-if-greater-or-equal  $trace:break/disp8
  # copy one byte
  8a/copy-byte                    0/mod/indirect  3/rm32/EBX    .           .             .           2/r32/DL    .               .                 # copy byte at *EBX to DL
  88/copy-byte                    0/mod/indirect  0/rm32/EAX    .           .             .           2/r32/DL    .               .                 # copy byte at DL to *EAX
  # updates
  40/increment-EAX
  43/increment-EBX
  eb/jump  $trace:loop/disp8
$trace:break:
  # finally, append a newline
    # if EAX/dest >= ECX/destend return
  39/compare                      3/mod/direct    0/rm32/EAX    .           .             .           1/r32/ECX   .               .                 # compare EAX with ECX
  7d/jump-if-greater-or-equal  $trace:end/disp8
    # append
  ba/copy-to-EDX  0x0a/imm32
  88/copy-byte                    0/mod/indirect  0/rm32/EAX    .           .             .           2/r32/DL    .               .                 # copy byte at DL to *EAX
$trace:end:
  # restore registers
  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

clear-trace-stream:  # t : (address trace-stream)
  # 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
  # EAX = t
  8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none              0/r32/EAX   8/disp8         .                 # copy *(EBP+8) to EAX
  # ECX = t.length
  8b/copy                         1/mod/*+disp8   0/rm32/EAX    .           .             .           1/r32/ECX   8/disp8         .                 # copy *(EAX+8) to ECX
  # ECX = &t.data[t.length]
  8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/EAX  1/index/ECX   .           1/r32/ECX   0xc/disp8       .                 # copy EAX+ECX+12 to ECX
  # t.write = 0
  c7/copy                         0/mod/direct    0/rm32/EAX    .           .             .           .           .               0/imm32           # copy to *EAX
  # t.read = 0
  c7/copy                         1/mod/*+disp8   0/rm32/EAX    .           .             .           .           4/disp8         0/imm32           # copy to *(EAX+4)
  # EAX = t.data
  81          0/subop/add         3/mod/direct    0/rm32/EAX    .           .             .           .           .               0xc/imm32         # add to EAX
  # while (true)
$clear-trace-stream:loop:
  # if EAX >= ECX break
  39/compare                      3/mod/direct    0/rm32/EAX    .           .             .           1/r32/ECX   .               .                 # compare EAX with ECX
  7d/jump-if-greater-or-equal  $clear-trace-stream:end/disp8
  # *EAX = 0
  c7/copy                         0/mod/direct    0/rm32/EAX    .           .             .           .           .               0/imm32           # copy to *EAX
  # EAX += 4
  81          0/subop/add         3/mod/direct    0/rm32/EAX    .           .             .           .           .               4/imm32           # add to EAX
  eb/jump  $clear-trace-stream:loop/disp8
$clear-trace-stream: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

test-trace-single:
  # clear-trace-stream(Test-trace-stream)
    # push args
  68/push  Test-trace-stream/imm32
    # call
  e8/call  clear-trace-stream/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
  # trace(Test-trace-stream, "Ab")
    # push args
  68/push  "Ab"/imm32
  68/push  Test-trace-stream/imm32
    # call
  e8/call  trace/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
  # check-ints-equal(*Test-trace-stream.data, 41/A 62/b 0a/newline 00, msg)
    # push args
  68/push  "F - test-trace-single"/imm32
  68/push  0x0a6241/imm32/Ab-newline
    # push *Test-trace-stream.data
  b8/copy-to-EAX  Test-trace-stream/imm32
  ff          6/subop/push        1/mod/*+disp8   0/rm32/EAX    .           .             .           .           0xc/disp8       .                 # push *(EAX+12)
    # call
  e8/call  check-ints-equal/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
  # end
  c3/return

test-trace-appends:
  # clear-trace-stream(Test-trace-stream)
    # push args
  68/push  Test-trace-stream/imm32
    # call
  e8/call  clear-trace-stream/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
  # trace(Test-trace-stream, "C")
    # push args
  68/push  "C"/imm32
  68/push  Test-trace-stream/imm32
    # call
  e8/call  trace/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
  # trace(Test-trace-stream, "D")
    # push args
  68/push  "D"/imm32
  68/push  Test-trace-stream/imm32
    # call
  e8/call  trace/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
  # check-ints-equal(*Test-trace-stream.data, 43/C 0a/newline 44/D 0a/newline, msg)
    # push args
  68/push  "F - test-trace-appends"/imm32
  68/push  0x0a440a43/imm32/C-newline-D-newline
    # push *Test-trace-stream.data
  b8/copy-to-EAX  Test-trace-stream/imm32
  ff          6/subop/push        1/mod/*+disp8   0/rm32/EAX    .           .             .           .           0xc/disp8       .                 # push *(EAX+12)
    # call
  e8/call  check-ints-equal/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
  # end
  c3/return

test-trace-empty-line:
  # clear-trace-stream(Test-trace-stream)
    # push args
  68/push  Test-trace-stream/imm32
    # call
  e8/call  clear-trace-stream/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
  # trace(Test-trace-stream, "")
    # push args
  68/push  ""/imm32
  68/push  Test-trace-stream/imm32
    # call
  e8/call  trace/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
  # check-ints-equal(*Test-trace-stream.data, 0, msg)
    # push args
  68/push  "F - test-trace-empty-line"/imm32
  68/push  0/imm32
    # push *Test-trace-stream.data
  b8/copy-to-EAX  Test-trace-stream/imm32
  ff          6/subop/push        1/mod/*+disp8   0/rm32/EAX    .           .             .           .           0xc/disp8       .                 # push *(EAX+12)
    # call
  e8/call  check-ints-equal/disp32
    # discard args
  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
  # end
  c3/return

# vim:nowrap:textwidth=0