forked from KolibriOS/kolibrios
30 lines
857 B
ArmAsm
30 lines
857 B
ArmAsm
|
|
.global ___chkstk
|
|
.global __alloca
|
|
|
|
.section .text
|
|
|
|
.align 4
|
|
___chkstk:
|
|
__alloca:
|
|
pushl %ecx /* save temp */
|
|
leal 8(%esp), %ecx /* point past return addr */
|
|
subl %eax, %ecx
|
|
cmpl %fs:4, %ecx # check low stack limit
|
|
jb 1f
|
|
|
|
movl %esp, %eax /* save old stack pointer */
|
|
movl %ecx, %esp /* decrement stack */
|
|
movl (%eax), %ecx /* recover saved temp */
|
|
movl 4(%eax), %eax /* recover return address */
|
|
|
|
/* Push the return value back. Doing this instead of just
|
|
jumping to %eax preserves the cached call-return stack
|
|
used by most modern processors. */
|
|
pushl %eax
|
|
ret
|
|
1:
|
|
int3 #trap to debugger
|
|
.ascii "Stack overflow"
|
|
|