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kolibrios/drivers/ddk/debug/chkstk.S
Sergey Semyonov (Serge) 66539255be ddk: missing chkstk.S
git-svn-id: svn://kolibrios.org@1873 a494cfbc-eb01-0410-851d-a64ba20cac60
2011-02-17 11:28:43 +00:00

32 lines
966 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
call *__imp__GetStackBase
cmpl %eax, %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.
#Oh wait... there is no kernel debugger
.ascii "Stack overflow"