diff options
| author | Kartik Agaram <vc@akkartik.com> | 2019-02-14 16:24:20 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-02-14 16:24:20 -0800 |
| commit | 1639687ba098aa81b0584f7dd609cb9690dc5a04 (patch) | |
| tree | 1a5ee40c30bf906c6ba5e55b8c5138a467022105 /subx/059stop.subx | |
| parent | 1ab48a69ccfa4ddaa2e1fa803ea6fe568b890abc (diff) | |
| download | mu-1639687ba098aa81b0584f7dd609cb9690dc5a04.tar.gz | |
4961
Diffstat (limited to 'subx/059stop.subx')
| -rw-r--r-- | subx/059stop.subx | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/subx/059stop.subx b/subx/059stop.subx index f9e67f9e..4478dab3 100644 --- a/subx/059stop.subx +++ b/subx/059stop.subx @@ -100,19 +100,20 @@ stop: # ed : (address exit-descriptor), value : int # no prolog; one way or another, we're going to clobber registers # EAX = ed 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 0/r32/EAX 4/disp8 . # copy *(ESP+4) to EAX - # exit(value) if ed->target == 0 + # if (ed->target == 0) really exit 81 7/subop/compare 0/mod/indirect 0/rm32/EAX . . . . . 0/imm32 # compare *EAX 75/jump-if-not-equal $stop:fake/disp8 - # syscall(exit, value) + # . syscall(exit, value) 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 3/r32/EBX 8/disp8 . # copy *(ESP+8) to EBX b8/copy-to-EAX 1/imm32/exit cd/syscall 0x80/imm8 $stop:fake: + # otherwise: # ed->value = value+1 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 1/r32/ECX 8/disp8 . # copy *(ESP+8) to ECX 41/inc-ECX 89/copy 1/mod/*+disp8 0/rm32/EAX . . . 1/r32/ECX 4/disp8 . # copy ECX to *(EAX+4) - # non-local jump to ed->target + # perform a non-local jump to ed->target 8b/copy 0/mod/indirect 0/rm32/EAX . . . 4/r32/ESP . . # copy *EAX to ESP $stop:end: c3/return # doesn't return to caller |