Re: [Tinycc-devel] libtcc run in process compiled with O2 coredump

[grischka]

jee wrote:
> I use libtcc to compile code like this:
> libtcc code:
> typedef int (*tw_type_CLog2Svr__Write_53)(unsigned int val_0,  char 
> val_1, void* val_2, void* val_3);  
> tw_type_CLog2Svr__Write_53 g_tw_type_CLog2Svr__Write_53;                 
>                              
> int tw_CLog2Svr__Write_53(unsigned int val_0,  char val_1, void* val_2, 
> void* val_3){  
> ......                
>     int val=
>     g_tw_type_CLog2Svr__Write_53(val_0, val_1, val_2, val_3);
> ......
>     return val;
> }

g_tw_type_CLog2Svr__Write_53 is not initialized.

> this code's asm is like this:
> 0x00007ffff5645980: mov    0x5af(%rip),%r11        # 0x7ffff5645f36
> 0x00007ffff5645987: mov    (%r11),%r11
> 0x00007ffff564598a: callq  *%r11
> when the code come to 0x00007ffff564598a, it's codedump with SIGSEGV.
>
> the ASM CODE 0x5af is wrong!

How is it wrong?

Also, what OS, what TCC version?

--- grischka