| 0,0 → 1,29 |
|---|
| |
| .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" |
| |