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