diff options
Diffstat (limited to 'subx/examples/ex12.subx')
| -rw-r--r-- | subx/examples/ex12.subx | 50 |
1 files changed, 25 insertions, 25 deletions
diff --git a/subx/examples/ex12.subx b/subx/examples/ex12.subx index 83943e1d..73d78d96 100644 --- a/subx/examples/ex12.subx +++ b/subx/examples/ex12.subx @@ -7,38 +7,38 @@ # You shouldn't get a segmentation fault. == 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 +# 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 - # syscall(mmap, 0x1000) - bb/copy-to-EBX Mmap-new-segment/imm32 - b8/copy-to-EAX 0x5a/imm32/mmap - cd/syscall 0x80/imm8 + # syscall(mmap, 0x1000) + bb/copy-to-EBX Mmap-new-segment/imm32 + b8/copy-to-EAX 0x5a/imm32/mmap + cd/syscall 0x80/imm8 - # store to *EAX - c7/copy 0/mod/direct 0/rm32/EAX . . . . . 0x34/imm32 # copy to *EAX + # store to *EAX + c7/copy 0/mod/direct 0/rm32/EAX . . . . . 0x34/imm32 # copy to *EAX - # syscall(exit, EAX) - 89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX - b8/copy-to-EAX 1/imm32/exit - cd/syscall 0x80/imm8 + # syscall(exit, EAX) + 89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX + b8/copy-to-EAX 1/imm32/exit + cd/syscall 0x80/imm8 == data # various constants used here were found in the Linux sources (search for file mman-common.h) Mmap-new-segment: # type mmap_arg_struct - # addr - 00 00 00 00 # null - # len - 00 01 00 00 # 0x1000 - # protection flags - 03 00 00 00 # PROT_READ | PROT_WRITE - # sharing flags - 22 00 00 00 # MAP_PRIVATE | MAP_ANONYMOUS - # fd - ff ff ff ff # -1 since MAP_ANONYMOUS is specified - # offset - 00 00 00 00 # 0 since MAP_ANONYMOUS is specified + # addr + 00 00 00 00 # null + # len + 00 01 00 00 # 0x1000 + # protection flags + 03 00 00 00 # PROT_READ | PROT_WRITE + # sharing flags + 22 00 00 00 # MAP_PRIVATE | MAP_ANONYMOUS + # fd + ff ff ff ff # -1 since MAP_ANONYMOUS is specified + # offset + 00 00 00 00 # 0 since MAP_ANONYMOUS is specified # vim:nowrap:textwidth=0 |