32 lines
650 B
ArmAsm
32 lines
650 B
ArmAsm
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/
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/ our buffer looks like:
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/ eax,ebx,ecx,edx,esi,edi,esp,ebp,pc
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/
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/ _longjmp is called with two parameters: jmp_buf*,int
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/ jmp_buf* is at 4(%esp), int is at 8(%esp)
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/ retaddr is, of course, at (%esp)
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.globl _longjmp
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.globl longjmp
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_longjmp:
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longjmp:
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movl 4(%esp), %ebx / address of buf
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movl 8(%esp), %eax / store return value
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movl 24(%ebx), %esp / restore stack
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movl 32(%ebx), %edi
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/ Next line sets up return address.
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movl %edi, 0(%esp)
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movl 8(%ebx), %ecx
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movl 12(%ebx), %edx
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movl 16(%ebx), %esi
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movl 20(%ebx), %edi
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movl 28(%ebx), %ebp
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movl 4(%ebx), %ebx
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testl %eax,%eax
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jne bye
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incl %eax / eax hold 0 if we are here
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bye:
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ret
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