source:
tags/syscall-add-simple-foo/enter2.asm
| Last change on this file was 2, checked in by , 15 years ago | |
|---|---|
| File size: 451 bytes | |
| Line | |
|---|---|
| 1 | section .text |
| 2 | global enter_section |
| 3 | extern printf |
| 4 | |
| 5 | enter_section: |
| 6 | enter 0, 0 ; 0 bytes of local stack space |
| 7 | mov ebx,[ebp+8] ; first parameter to function |
| 8 | |
| 9 | |
| 10 | spin: mov ecx, 0 |
| 11 | lock bts dword [ebx], 0 |
| 12 | jc save |
| 13 | print: push busy |
| 14 | call printf |
| 15 | |
| 16 | cmp ecx, 1 |
| 17 | je spin |
| 18 | |
| 19 | save: mov ecx, 1 |
| 20 | jmp print |
| 21 | |
| 22 | leave ; mov esp,ebp / pop ebp |
| 23 | ret |
| 24 | |
| 25 | section .rodata |
| 26 | busy: db "Busy waiting!",10,0 |
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