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November 15, 2016 13:44
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Example of symbolic code
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| .globl foo | |
| .text | |
| foo: | |
| movl 4(%esp), %eax # load arg0 into eax | |
| leal (foo_real), %ecx | |
| jmp *%ecx | |
| .data | |
| foo_real: | |
| subl $666, %eax # trigger input is 666 | |
| addb $0xeb, %al | |
| leal (L1), %edx | |
| leal (L2), %ecx | |
| subl %edx, %ecx | |
| movb %cl, %ah | |
| leal (L1), %ecx | |
| movw %ax, -2(%ecx) | |
| nop | |
| nop | |
| L1: | |
| movl $1, %eax | |
| jmp exit | |
| L2: | |
| movl $2, %eax | |
| exit: | |
| ret |
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