backtrace() not working on ARMv7a

[SHREYAS JOSHI]

Try -fexceptions.

For further details, check the following link.

http://www.tune2wizard.com/backtrace/ 


Thanks & regards,
Shreyas Joshi




________________________________
 From: Rajendra Dendukuri <rajendra at broadcom.com>
To: "uclibc at uclibc.org" <uclibc at uclibc.org> 
Sent: Wednesday, September 11, 2013 10:01 PM
Subject: backtrace() not working on ARMv7a
 

Hi uclibc list,

I am trying to generate a call stack trace using backtrace() API which is part of libubacktrace. The idea is to catch a SIGSEGV signal and call backtrace() to print all the address values and compare the obtained addresses from objdump -D of executable. Attached is a simplified version of the application. Following is the output seen on ARMv7a platform with buildroot cross-toolchain (gcc- 4.6.3, uClibc-0.9.33.2, binutis-2.21.1).

To compile the application:
${CROSS_COMPILE}gcc -o crash_test -O0 -funwind-tables -rdynamic crash_test.c

ARMv7a# ./crash_test
Trying to access NULL pointer!
SIGSEGV Handler!
Got Backtrace Size=2
0x00008724
0x000087c4
ARMv7a#

The above function call trace is only that of the signal hander (print_back_trace, sigsegv_handler) and does not show the entire call stack for the function where program crashed (print_back_trace, sigsegv_handler, func2, main).

On x86 host same program shows a deeper function call trace right up to the main function and even beyond:
x86-RHEL5-host$./crash_test
Trying to access NULL pointer!
SIGSEGV Handler!
Got Backtrace Size=7
0x00400939
0x004009ab
0x30930302f0
0x004009d3
0x00400a7b
0x309301d994
0x00400889
x86-RHEL5-host$

Can someone please comment on what is going wrong. Any special flags that need to be used while compiling/linking the program.

/Thanks

_______________________________________________
uClibc mailing list
uClibc at uclibc.org
http://lists.busybox.net/mailman/listinfo/uclibc