[Skyeye-developer] Found a bug in gdb single-stepping code

[Tomei Ningen]

Hi,

I found a bug if you single step the very first instrution in the ELF image. I.e.,

    skyeye -e linux -d

    arm-elf-gdb linux
    target remote localhost:12345
    si

This would change the PC to 0x04, and execute the instruction there, regardless of the entry point of the ELF image.

The fix is simple. With 1.2.0-RC8 release, patch utils/debugger/arch_reg.c:

void gdbserver_step(){
     if(!strcmp(skyeye_config.arch->arch_name,"arm")){
        //chy 2006004-12
+++     state->NextInstr = RESUME;    /* treat as PC change */
        state->Reg[15]=ARMul_DoInstr (state);
    }
}

I guess no one found this bug because the SkyEye developers are way past debugging the first instruction in your program :-)

- TN

 		
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