diff options
| author | Kartik Agaram <vc@akkartik.com> | 2018-12-03 12:03:23 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-12-03 12:03:23 -0800 |
| commit | 91dab3e1a499cac50abd146ce849d3dab94229ab (patch) | |
| tree | 0ae698ea9ed9e1e3523aa6e5aefa9e0b8c8e2400 /subx/053new_segment.subx | |
| parent | 26efb5f5c2a3ddbaf82f06e6ca6090caf7ab5a16 (diff) | |
| download | mu-91dab3e1a499cac50abd146ce849d3dab94229ab.tar.gz | |
4824
Diffstat (limited to 'subx/053new_segment.subx')
| -rw-r--r-- | subx/053new_segment.subx | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/subx/053new_segment.subx b/subx/053new_segment.subx index efbfc1a3..27fd8ea1 100644 --- a/subx/053new_segment.subx +++ b/subx/053new_segment.subx @@ -12,33 +12,33 @@ # . . call e8/call new-segment/disp32 # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP # write to *EAX to check that we have access to the newly-allocated segment - c7/copy 0/mod/direct 0/rm32/EAX . . . . . 0x34/imm32 # copy 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 + 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 new-segment: # len : int -> address # . prolog 55/push-EBP - 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP 53/push-EBX # copy len to _mmap-new-segment->len # TODO: compute _mmap-new-segment+4 before runtime - 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 0/r32/EAX 8/disp8 . # copy *(EBP+8) to EAX + 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . 0/r32/EAX 8/disp8 . # copy *(EBP+8) to EAX bb/copy-to-EBX _mmap-new-segment/imm32 - 89/copy 1/mod/*+disp8 3/rm32/EBX . . . 0/r32/EAX 4/disp8 . # copy EAX to *(EBX+4) + 89/copy 1/mod/*+disp8 3/rm32/EBX . . . 0/r32/EAX 4/disp8 . # copy EAX to *(EBX+4) # mmap(_mmap-new-segment) bb/copy-to-EBX _mmap-new-segment/imm32 b8/copy-to-EAX 0x5a/imm32/mmap cd/syscall 0x80/imm8 # . epilog 5b/pop-to-EBX - 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP 5d/pop-to-EBP c3/return |