unw_step loops forever on MIPS.

[Story, Lenny]

Greetings,

I have a test of libunwind running on my mips target.  It seems the the unw_step api always returns > 0. This results in my backtrace loop never terminating.  

Any thoughts on why this would happen ?

Thanks !

-Lenny

I am using 1.5.0.

 [BACKTRACE] (1) main:140

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

 [BACKTRACE] (1) _init:736

void show_backtrace(void)

{

    char symbol[256];

    unw_cursor_t  cursor;

    unw_context_t context;

   

    unw_getcontext(&context);    

    unw_init_local(&cursor, &context);

   

    int Cursor_Result = 0;

    int n = 0;

   

    while((Cursor_Result = unw_step(&cursor)) > 0)

    {

        unw_word_t ip;

        unw_word_t sp;

        unw_word_t off;

   

        unw_get_reg(&cursor, UNW_REG_IP, &ip);

        unw_get_reg(&cursor, UNW_REG_SP, &sp);              

       

        memset(&symbol, 0, sizeof(symbol));

       

        if (unw_get_proc_name(&cursor, &symbol[0], sizeof(symbol), &off) == 0)

        {

            fprintf(stdout, "[BACKTRACE] (%d) %s:%d \n", Cursor_Result, &symbol[0], off);            

        }        

        if(n++ > 10)

            break;

    }

}

This e-mail message and any files attached may contain information that iRobot Corporation considers confidential and/or proprietary or may later designate as confidential and proprietary. If you are not the intended recipient, please contact the sender and delete the email immediately. Unauthorized use or distribution is strictly prohibited.