source: EcnlProtoTool/trunk/tcc-0.9.26/lib/alloca86_64.S@ 279

Last change on this file since 279 was 279, checked in by coas-nagasima, 7 years ago

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File size: 711 bytes
Line 
1/* ---------------------------------------------- */
2/* alloca86_64.S */
3
4.globl alloca
5
6alloca:
7 pop %rdx
8#ifdef TCC_TARGET_PE
9 mov %rcx,%rax
10#else
11 mov %rdi,%rax
12#endif
13 add $15,%rax
14 and $-16,%rax
15 jz p3
16
17#ifdef TCC_TARGET_PE
18p1:
19 cmp $4096,%rax
20 jle p2
21 sub $4096,%rsp
22 sub $4096,%rax
23 test %rax,(%rsp)
24 jmp p1
25p2:
26#endif
27
28 sub %rax,%rsp
29 mov %rsp,%rax
30#ifdef TCC_TARGET_PE
31 add $32,%rax
32#endif
33
34p3:
35 push %rdx
36 ret
37
38/* mark stack as nonexecutable */
39#if defined __ELF__ && defined __linux__
40 .section .note.GNU-stack,"",@progbits
41#endif
42/* ---------------------------------------------- */
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