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Fix: Replace Divide-by-Zero Crash with Clean Exit #5

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Fix: Replace Divide-by-Zero Crash with Clean Exit #5

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29 changes: 25 additions & 4 deletions stitcher/src/stitcher.py
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Original file line number Diff line number Diff line change
Expand Up @@ -227,10 +227,31 @@ def is_hex_str(s):
return True

def generate_div_0(n, out_f):
out_f.write('\t\tmov edx, 0\n')
out_f.write('\t\tmov eax, %d\n' % n)
out_f.write('\t\tmov ecx, 0\n')
out_f.write('\t\tdiv ecx\n')
if n < 10 or n >= 100:
print("Wrong, generate wrong div")
# int to ascii char
tens = n // 10 + 48
nos = n % 10 + 48
# write number
out_f.write('\t\tsub rsp, 8\n')
out_f.write('\t\tmov dword ptr [rsp], %d\n' % tens)
out_f.write('\t\tmov dword ptr [rsp+1], %d\n' % nos)
out_f.write('\t\tmov dword ptr [rsp+2], 10\n')
out_f.write('\t\tmov rax, 1\n')
out_f.write('\t\tmov rdi, 1\n')
out_f.write('\t\tmov rsi, rsp\n')
out_f.write('\t\tmov rdx, 3\n')
out_f.write('\t\tsyscall\n')
out_f.write('\n')
# sys_exit
out_f.write('\t\tmov rax, 60\n')
out_f.write('\t\txor rdi, rdi\n')
out_f.write('\t\tsyscall\n')
# original divide 0
#out_f.write('\t\tmov edx, 0\n')
#out_f.write('\t\tmov eax, %d\n' % n)
#out_f.write('\t\tmov ecx, 0\n')
#out_f.write('\t\tdiv ecx\n')

"""
For all untrigerred conditional branches, create dummy code as the target.
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