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February 24, 2018 14:06
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Calculates the bytes used for a negative relative jump over 126 bytes in x64 asm (e.g: je $-300)
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| loc = 200 | |
| asm = [0xfa, 0xff, 0xff, 0xff] | |
| for i in range(0, loc): | |
| if asm[0] == 0x00: | |
| if asm[1] == 0x00: | |
| if asm[2] == 0x00: | |
| asm[3] -= 1 | |
| asm[2] = 0xff | |
| asm[1] = 0xff | |
| asm[0] = 0xff | |
| else: | |
| asm[2] -= 1 | |
| asm[1] = 0xff | |
| asm[0] = 0xff | |
| else: | |
| asm[1] -= 1 | |
| asm[0] = 0xff | |
| else: | |
| asm[0] -= 1 | |
| print(''.join('{:02x} '.format(x) for x in asm)) |
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