6572 - mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

about summary refs log tree commit diff stats

diff options

author	Kartik Agaram <vc@akkartik.com>	2020-06-21 17:31:38 -0700
committer	Kartik Agaram <vc@akkartik.com>	2020-06-21 17:31:38 -0700
commit	3b02c3dfa26745f2ea178600b840a34cec4d649b (patch)
tree	259be41cecbd13bb9357323f8d3a7ec6db9a37d1 /html/apps/*.subx.html
parent	47fe226b7e5841d25b3392f40bb3698d405e39f2 (diff)
download	mu-3b02c3dfa26745f2ea178600b840a34cec4d649b.tar.gz

6572

Small change to mu.subx to keep the treeshaker working with it. That's
currently the only place where we prevent jumps across 'functions'.

Diffstat (limited to 'html/apps/*.subx.html')

0 files changed, 0 insertions, 0 deletions

ter Kartik Agaram <vc@akkartik.com> 2020-06-29 17:58:01 -0700 6594 - start standardizing the meaning of 'print'' href='/akkartik/mu/commit/078emit-hex.subx?h=hlt&id=05dabd816a8ead6ff0e949cc16bf30140811bad6'>05dabd81 ^

fd91f7f6 ^

05dabd81 ^

fd91f7f6 ^

7a583220 ^

fd91f7f6 ^

686a52bd ^

fd91f7f6 ^

686a52bd ^

fd91f7f6 ^

686a52bd ^

fd91f7f6 ^

686a52bd ^

fd91f7f6 ^

686a52bd ^

fd91f7f6 ^

686a52bd ^

fd91f7f6 ^

686a52bd ^

fd91f7f6 ^

686a52bd ^

fd91f7f6 ^

== 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

# print 'n' in hex in 'width' bytes in lower-endian order, with a space after every byte
emit-hex:  # out: (addr buffered-file), n: int, width: int
    # . prologue
    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
    57/push-edi
    # edi = out
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
    # ebx = n
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           3/r32/ebx   0xc/disp8       .                 # copy *(ebp+12) to ebx
    # edx = width
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           2/r32/edx   0x10/disp8      .                 # copy *(ebp+16) to edx
    # var curr/ecx: int = 0
    31/xor                          3/mod/direct    1/rm32/ecx    .           .             .           1/r32/ecx   .               .                 # clear ecx
$emit-hex:loop:
    # if (curr >= width) break
    39/compare                      3/mod/direct    1/rm32/ecx    .           .             .           2/r32/edx   .               .                 # compare ecx with edx
    7d/jump-if->=  $emit-hex:end/disp8
    # write-byte-hex-buffered(out, ebx)  # only BL used
    # . . push args
    53/push-ebx
    57/push-edi
    # . . call
    e8/call  write-byte-hex-buffered/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # write-byte-buffered(out, ' ')
    # . . push args
    68/push  0x20/imm32/space
    57/push-edi
    # . . call
    e8/call  write-byte-buffered/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # ebx = ebx >> 8
    c1/shift    5/subop/logic-right 3/mod/direct    3/rm32/ebx    .           .             .           .           .               8/imm8            # shift ebx right by 8 bits, while padding zeroes
$emit-hex:continue:
    # ++curr
    41/increment-ecx
    eb/jump  $emit-hex:loop/disp8
$emit-hex:end:
    # . restore registers
    5f/pop-to-edi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    58/pop-to-eax
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-emit-hex-single-byte:
    # setup
    # . 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->buffer)
    # . . push args
    68/push  $_test-output-buffered-file->buffer/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # emit-hex(_test-output-buffered-file, 0xab, 1)
    # . . push args
    68/push  1/imm32
    68/push  0xab/imm32
    68/push  _test-output-buffered-file/imm32
    # . . call
    e8/call  emit-hex/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # flush(_test-output-buffered-file)
    # . . push args
    68/push  _test-output-buffered-file/imm32
    # . . call
    e8/call  flush/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # check-ints-equal(*_test-output-stream->data, 'ab ', msg)
    # . . push args
    68/push  "F - test-emit-hex-single-byte"/imm32
    68/push  0x206261/imm32
    # . . push *_test-output-stream->data
    b8/copy-to-eax  _test-output-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-emit-hex-multiple-byte:
    # setup
    # . 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->buffer)
    # . . push args
    68/push  $_test-output-buffered-file->buffer/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # emit-hex(_test-output-buffered-file, 0x1234, 2)
    # . . push args
    68/push  2/imm32
    68/push  0x1234/imm32
    68/push  _test-output-buffered-file/imm32
    # . . call
    e8/call  emit-hex/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # flush(_test-output-buffered-file)
    # . . push args
    68/push  _test-output-buffered-file/imm32
    # . . call
    e8/call  flush/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # check-stream-equal(_test-output-stream, "34 12 ", msg)
    # . . push args
    68/push  "F - test-emit-hex-multiple-byte/1"/imm32
    68/push  "34 12 "/imm32
    68/push  _test-output-stream/imm32
    # . . call
    e8/call  check-stream-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . end
    c3/return

test-emit-hex-zero-pad:
    # setup
    # . 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->buffer)
    # . . push args
    68/push  $_test-output-buffered-file->buffer/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # emit-hex(_test-output-buffered-file, 0xab, 2)
    # . . push args
    68/push  2/imm32
    68/push  0xab/imm32
    68/push  _test-output-buffered-file/imm32
    # . . call
    e8/call  emit-hex/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # flush(_test-output-buffered-file)
    # . . push args
    68/push  _test-output-buffered-file/imm32
    # . . call
    e8/call  flush/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # check(_test-output-stream->data == 'ab 00 ')
    # . . push args
    68/push  "F - test-emit-hex-zero-pad/1"/imm32
    68/push  "ab 00 "/imm32
    68/push  _test-output-stream/imm32
    # . . call
    e8/call  check-stream-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . end
    c3/return

test-emit-hex-negative:
    # setup
    # . 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->buffer)
    # . . push args
    68/push  $_test-output-buffered-file->buffer/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # emit-hex(_test-output-buffered-file, -1, 2)
    # . . push args
    68/push  2/imm32
    68/push  -1/imm32
    68/push  _test-output-buffered-file/imm32
    # . . call
    e8/call  emit-hex/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # flush(_test-output-buffered-file)
    # . . push args
    68/push  _test-output-buffered-file/imm32
    # . . call
    e8/call  flush/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # check-stream-equal(_test-output-stream == "ff ff ")
    # . . push args
    68/push  "F - test-emit-hex-negative/1"/imm32
    68/push  "ff ff "/imm32
    68/push  _test-output-stream/imm32
    # . . call
    e8/call  check-stream-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


context:
space:
mode: