diff options
Diffstat (limited to 'subx/056trace.subx')
| -rw-r--r-- | subx/056trace.subx | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/subx/056trace.subx b/subx/056trace.subx index fac2d4e7..cedc512a 100644 --- a/subx/056trace.subx +++ b/subx/056trace.subx @@ -272,7 +272,7 @@ _append-3: # out : address, outend : address, s : (array byte) -> num_bytes_app 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP # . save registers 51/push-ECX - # _append-4(out, outend, &s->data[0], &s->data[s->length]) -> num_bytes_appended/EAX + # EAX = _append-4(out, outend, &s->data[0], &s->data[s->length]) # . . push &s->data[s->length] 8b/copy 1/mod/*+disp8 5/rm32/EBP . . 0/r32/EAX 0x10/disp8 . # copy *(EBP+16) to EAX 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX @@ -322,9 +322,9 @@ $_append-4:loop: # if (in >= inend) break 39/compare 3/mod/direct 6/rm32/ESI . . . 1/r32/ECX . . # compare ESI with ECX 7d/jump-if-greater-or-equal $_append-4:end/disp8 - # if (out >= outend) break # for now silently ignore filled up buffer + # if (out >= outend) abort # just to catch test failures fast 39/compare 3/mod/direct 7/rm32/EDI . . . 2/r32/EDX . . # compare EDI with EDX - 7d/jump-if-greater-or-equal $_append-4:end/disp8 + 7d/jump-if-greater-or-equal $_append-4:abort/disp8 # *out = *in 8a/copy-byte 0/mod/indirect 6/rm32/ESI . . . 3/r32/BL . . # copy byte at *ESI to BL 88/copy-byte 0/mod/indirect 7/rm32/EDI . . . 3/r32/BL . . # copy byte at BL to *EDI @@ -347,4 +347,19 @@ $_append-4:end: 5d/pop-to-EBP c3/return +$_append-4:abort: + # . _write(2/stderr, error) + # . . push args + 68/push "stream overflow"/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 + # . . vim:nowrap:textwidth=0 |