diff options
Diffstat (limited to 'linux/119error-byte.subx')
| -rw-r--r-- | linux/119error-byte.subx | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/linux/119error-byte.subx b/linux/119error-byte.subx new file mode 100644 index 00000000..1ce0a3d6 --- /dev/null +++ b/linux/119error-byte.subx @@ -0,0 +1,90 @@ +# Print an error message followed by the text representation of a byte. Then exit. + +== 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: # manual test +#? # . 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 +#? # . error-byte(ed, Stdout, msg, 34) +#? 68/push 0x34/imm32 +#? 68/push "abc"/imm32 +#? 68/push Stderr/imm32 +#? 50/push-eax +#? e8/call error-byte/disp32 +#? # . syscall(exit, Num-test-failures) +#? 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/ebx Num-test-failures/disp32 # copy *Num-test-failures to ebx +#? e8/call syscall_exit/disp32 + +# write(out, "Error: "+msg+": "+byte) then stop(ed, 1) +error-byte: # ed: (addr exit-descriptor), out: (addr buffered-file), msg: (addr array byte), n: byte + # . prologue + 55/push-ebp + 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp + # write-buffered(out, "Error: ") + # . . push args + 68/push "Error: "/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 + # write-buffered(out, msg) + # . . 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) + # . . call + e8/call write-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 + # write-byte-hex-buffered(out, byte) + # . . 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 . . . . 0xc/disp8 . # push *(ebp+12) + # . . 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-buffered(out, Newline) + # . . 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 + # flush(out) + # . . push args + ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12) + # . . call + e8/call flush/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp + # stop(ed, 1) + # . . push args + 68/push 1/imm32 + ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) + # . . call + e8/call stop/disp32 + # should never get past this point +$error-byte:dead-end: + # . epilogue + 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp + 5d/pop-to-ebp + c3/return + +# . . vim:nowrap:textwidth=0 |