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Re: software breakpoint in gdb
On 01/30/2012 01:54 PM, Kevin Pouget wrote:
> I would be curious about why it would be "a disastrous mistake".
> Please correct me if I'm wrong in my understanding:
The real disaster is interrupt instruction may corrupt the following
instruction of breakpointed instruction, if interrupt instruction is
longer than breakpointed instruction. For example,
JMP L1:
...
INSN1 (1-byte)
L1:INSN2 (2-byte)
Supposing the length of interrupt instruction is 2-byte, when setting
breakpoint on INSN1, the INSN2 is corrupted. If the program runs JMP
instruction to L1 directly, something wrong will be executed.
--
Yao (éå)