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x86-64: chkstk, alloca

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This commit is contained in:
grischka
2009-07-18 22:06:54 +02:00
parent c0fc0fa0c4
commit fc977d56c9
8 changed files with 104 additions and 59 deletions
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74
win32/lib/chkstk.S
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@ -1,29 +1,61 @@
// =================================================
// chkstk.s
/* ---------------------------------------------- */
/* chkstk86.s */
#include "../../config.h"
/* ---------------------------------------------- */
#ifndef TCC_TARGET_X86_64
/* ---------------------------------------------- */
.text
.globl __chkstk
__chkstk:
xchg (%esp), %ebp // store ebp, get ret.addr
push %ebp // push ret.addr
lea 4(%esp), %ebp // setup frame ptr
push %ecx // save ecx
mov %ebp, %ecx
xchg (%esp),%ebp /* store ebp, get ret.addr */
push %ebp /* push ret.addr */
lea 4(%esp),%ebp /* setup frame ptr */
push %ecx /* save ecx */
mov %ebp,%ecx
P0:
sub $4096,%ecx
test %eax,(%ecx)
sub $4096,%eax
cmp $4096,%eax
jge P0
sub $4096,%ecx
test %eax,(%ecx)
sub $4096,%eax
cmp $4096,%eax
jge P0
sub %eax,%ecx
test %eax,(%ecx)
sub %eax,%ecx
mov %esp,%eax
test %eax,(%ecx)
mov %ecx,%esp
mov %esp,%eax
mov %ecx,%esp
mov (%eax),%ecx /* restore ecx */
jmp *4(%eax)
mov (%eax),%ecx // restore ecx
mov 4(%eax),%eax
push %eax
ret
/* ---------------------------------------------- */
#else
/* ---------------------------------------------- */
.globl __chkstk
__chkstk:
xchg (%rsp),%rbp /* store ebp, get ret.addr */
push %rbp /* push ret.addr */
lea 8(%rsp),%rbp /* setup frame ptr */
push %rcx /* save ecx */
mov %rbp,%rcx
movslq %eax,%rax
P0:
sub $4096,%rcx
test %rax,(%rcx)
sub $4096,%rax
cmp $4096,%rax
jge P0
sub %rax,%rcx
test %rax,(%rcx)
mov %rsp,%rax
mov %rcx,%rsp
mov (%rax),%rcx /* restore ecx */
jmp *8(%rax)
/* ---------------------------------------------- */
#endif
/* ---------------------------------------------- */