diff options
Diffstat (limited to 'subx/examples/ex7.subx')
| -rw-r--r-- | subx/examples/ex7.subx | 72 |
1 files changed, 38 insertions, 34 deletions
diff --git a/subx/examples/ex7.subx b/subx/examples/ex7.subx index 17a38e29..6e0294d9 100644 --- a/subx/examples/ex7.subx +++ b/subx/examples/ex7.subx @@ -16,84 +16,88 @@ # 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 ## creat(filename) - bb/copy . . . . . . . 0x08049131/imm32/fname # copy to EBX - b9/copy . . . . . . . 0x180/imm32/fixed-perms # copy 0 to ECX + bb/copy . . . . . . . filename/imm32 # copy to EBX + b9/copy . . . . . . . 0x180/imm32/fixed-perms # copy to ECX b8/copy . . . . . . . 8/imm32/creat # copy 8 to EAX cd/syscall . . . . . . . 0x80/imm8 # int 80h - ## fd = open(filename, O_WRONLY, 0) - bb/copy . . . . . . . 0x08049131/imm32/fname # copy to EBX + ## stream = open(filename, O_WRONLY, 0) # we can't use 'fd' because it looks like a hex byte + bb/copy . . . . . . . filename/imm32 # copy to EBX b9/copy . . . . . . . 1/imm32/wronly # copy 1 to ECX ba/copy . . . . . . . 0x180/imm32/fixed-perms # copy 0 to EDX b8/copy . . . . . . . 5/imm32/open # copy 5 to EAX cd/syscall . . . . . . . 0x80/imm8 # int 80h - # save fd - bb/copy . . . . . . . 0x08049125/imm32/fd # copy to EBX + # save stream + bb/copy . . . . . . . stream/imm32 # copy to EBX 89/copy 0/mod/indirect 3/rm32/EBX 0/r32/EAX # copy EAX to *EBX - ## write(fd, "a", 1) - # load fd - bb/copy . . . . . . . 0x08049125/imm32/fd # copy to EBX + ## write(stream, "a", 1) + # load stream + bb/copy . . . . . . . stream/imm32 # copy to EBX 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX # copy *EBX to EBX # - b9/copy . . . . . . . 0x08049129/imm32/a # copy to ECX + b9/copy . . . . . . . a/imm32 # copy to ECX ba/copy . . . . . . . 1/imm32/size # copy 1 to EDX b8/copy . . . . . . . 4/imm32/write # copy 4 to EAX cd/syscall . . . . . . . 0x80/imm8 # int 80h - ## close(fd) - # load fd - bb/copy . . . . . . . 0x08049125/imm32/fd # copy to EBX + ## close(stream) + # load stream + bb/copy . . . . . . . stream/imm32 # copy to EBX 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX # copy *EBX to EBX # b8/copy . . . . . . . 6/imm32/close # copy 6 to EAX cd/syscall . . . . . . . 0x80/imm8 # int 80h - ## fd = open(filename, O_RDONLY, 0) - bb/copy . . . . . . . 0x08049131/imm32/fname # copy to EBX + ## stream = open(filename, O_RDONLY, 0) + bb/copy . . . . . . . filename/imm32 # copy to EBX b9/copy . . . . . . . 0/imm32/rdonly # copy 0 to ECX - ba/copy . . . . . . . 0x180/imm32/fixed-perms # copy 0 to EDX + ba/copy . . . . . . . 0x180/imm32/fixed-perms # copy to EDX b8/copy . . . . . . . 5/imm32/open # copy 5 to EAX cd/syscall . . . . . . . 0x80/imm8 # int 80h - # save fd - bb/copy . . . . . . . 0x08049125/imm32/fd # copy to EBX + # save stream + bb/copy . . . . . . . stream/imm32 # copy to EBX 89/copy 0/mod/indirect 3/rm32/EBX 0/r32/EAX # copy EAX to *EBX - ## read(fd, b, 1) - # load fd - bb/copy . . . . . . . 0x08049125/imm32/fd # copy to EBX + ## read(stream, b, 1) + # load stream + bb/copy . . . . . . . stream/imm32 # copy to EBX 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX # copy *EBX to EBX # - b9/copy . . . . . . . 0x0804912d/imm32/b # copy to ECX + b9/copy . . . . . . . b/imm32 # copy to ECX ba/copy . . . . . . . 1/imm32/size # copy 1 to EDX b8/copy . . . . . . . 3/imm32/read # copy 3 to EAX cd/syscall . . . . . . . 0x80/imm8 # int 80h - ## close(fd) - # load fd - bb/copy . . . . . . . 0x08049125/imm32/fd # copy to EBX + ## close(stream) + # load stream + bb/copy . . . . . . . stream/imm32 # copy to EBX 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX # copy *EBX to EBX # - b8/copy . . . . . . . 6/imm32/close # copy 8 to EAX + b8/copy . . . . . . . 6/imm32/close # copy 6 to EAX cd/syscall . . . . . . . 0x80/imm8 # int 80h ## unlink(filename) - bb/copy . . . . . . . 0x08049131/imm32/fname # copy to EBX - b8/copy . . . . . . . 0xa/imm32/unlink # copy 8 to EAX + bb/copy . . . . . . . filename/imm32 # copy to EBX + b8/copy . . . . . . . 0xa/imm32/unlink # copy 10 to EAX cd/syscall . . . . . . . 0x80/imm8 # int 80h ## exit(b) # load b - bb/copy . . . . . . . 0x0804912d/imm32/b # copy to EBX + bb/copy . . . . . . . b/imm32 # copy to EBX 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX # copy *EBX to EBX # b8/copy . . . . . . . 1/imm32/exit # copy 1 to EAX cd/syscall . . . . . . . 0x80/imm8 # int 80h -== 0x08049125 # data segment -00 00 00 00 # fd -61 00 00 00 # a: string to write to file: 'a' -00 00 00 00 # b: space for string read from file -2e 66 6f 6f 00 00 00 00 # filename: '.foo' +== data +stream: +00 00 00 00 +a: +61 00 00 00 +b: +00 00 00 00 +filename: +2e 66 6f 6f 00 00 00 00 # vim:ft=subx:nowrap:tw& |