30 lines
578 B
ArmAsm
30 lines
578 B
ArmAsm
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// =================================================
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// chkstk.s
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.text
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.globl __chkstk
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__chkstk:
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xchg (%esp), %ebp // store ebp, get ret.addr
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push %ebp // push ret.addr
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lea 4(%esp), %ebp // setup frame ptr
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push %ecx // save ecx
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mov %ebp, %ecx
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P0:
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sub $4096,%ecx
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test %eax,(%ecx)
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sub $4096,%eax
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cmp $4096,%eax
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jge P0
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sub %eax,%ecx
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mov %esp,%eax
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test %eax,(%ecx)
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mov %ecx,%esp
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mov (%eax),%ecx // restore ecx
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mov 4(%eax),%eax
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push %eax
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ret
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