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Compiling a simple Hello World program generates assembly code that contains: # (external call) movl (sp), %esp # <REQ> movl $printf, (external) When using post/xor.py (and other post scripts), the corresponding instructions generated are: # (external call) #xor> movl (sp), %esp # <REQ> xorl %ebx, %ebx xorl (sp), %ebx xorl %esp # <REQ>, %ebx xorl %ebx, %esp # <REQ> The third instruction is the problematic: xorl %esp # <REQ>, %ebx The root cause is that the comment (# <REQ>) is also being identified as the "destination" register My change makes it discard the comment
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Compiling a simple Hello World program generates assembly code that contains:
When using post/xor.py (and other post scripts), the corresponding instructions generated are:
The third instruction is the problematic:
xorl %esp # <REQ>, %ebxThe root cause is that the comment (
# <REQ>) is also being identified as the "destination" registerMy change makes it discard the comment