blob: 2262eb0d13e792b53ddc73efd6ea414b68d5db1b [file] [log] [blame]
/* Implementation for gcc's internal stack-allocation routines. */
.global ___chkstk
.global __alloca
.global ___chkstk_ms
___chkstk_ms:
#ifdef _WIN64
pushq %rax
pushq %rcx
cmpq $0x1000, %rax
leaq 24(%rsp), %rcx
jb .Lchkstk_ms_end
.Lchkstk_ms_loop:
subq $0x1000, %rcx
subq $0x1000, %rax
orq $0x0, (%rcx)
cmpq $0x1000, %rax
ja .Lchkstk_ms_loop
.Lchkstk_ms_end:
subq %rax, %rcx
orq $0x0, (%rcx)
popq %rcx
popq %rax
ret
#else
pushl %eax
pushl %ecx
cmpl $0x1000, %eax
leal 12(%esp), %ecx
jb chkstk_ms_end
chkstk_ms_loop:
subl $0x1000, %ecx
subl $0x1000, %eax
orl $0x0, (%ecx)
cmpl $0x1000, %eax
ja chkstk_ms_loop
chkstk_ms_end:
subl %eax, %ecx
orl $0x0, (%ecx)
popl %ecx
popl %eax
ret
#endif
#ifdef _WIN64
__alloca:
movq %rcx, %rax
.align 4
___chkstk:
popq %r11
movq %rsp, %r10
cmpq $0x1000, %rax
jb .Lchkstk_end
.Lchkstk_loop:
subq $0x1000, %r10
subq $0x1000, %rax
orl $0x0, (%r10)
cmpq $0x1000, %rax
ja .Lchkstk_loop
.Lchkstk_end:
subq %rax, %r10
movq %rsp, %rax
orl $0x0, (%r10)
movq %r10, %rsp
pushq %r11
ret
#else
___chkstk:
__alloca:
pushl %ecx
leal 8(%esp), %ecx
cmpl $0x1000, %eax /* > 4k ?*/
jb chkstk_end
chkstk_loop:
subl $0x1000, %ecx
subl $0x1000, %eax
orl $0x0, (%ecx)
cmpl $0x1000, %eax
ja chkstk_loop
chkstk_end:
subl %eax, %ecx
orl $0x0, (%ecx)
movl %esp, %eax
movl %ecx, %esp
movl (%eax), %ecx
pushl 4(%eax)
ret
#endif