[Bug backtrace/16721] New: Erroneous backtrace on AVR

["pierre.langlois at embecosm dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16721

            Bug ID: 16721
           Summary: Erroneous backtrace on AVR
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: backtrace
          Assignee: pierre.langlois at embecosm dot com
          Reporter: pierre.langlois at embecosm dot com
                CC: jeremy.bennett at embecosm dot com
            Target: avr

Created attachment 7480
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7480&action=edit
Test program and elf file.

Stack unwinding is not working with this small program:

(gdb) bt
#0  multiply (a=25, b=8) at ../src/main.c:4
#1  *0x01e00000 in ?? ()

This was tested running against simulator models with the atmega2560 chip.

------------------------------------------------------------------------------

GNU gdb (AVR 8-bit toolchain (built 20140310)) 7.7.50.20140318-cvs
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(gdb) file atmega-test.elf
Reading symbols from atmega-test.elf...done.
(gdb) target dremote :51000
Remote debugging using :51000
0x00000116 in multiply (a=25, b=8) at main.c:4
4        return a * b;
(gdb) monitor reset
(gdb) load
Loading section .text, size 0x1a4 lma 0x0
Start address 0x0, load size 420
Transfer rate: 3360 bits in <1 sec, 210 bytes/write.
(gdb) b multiply
Breakpoint 1 at 0x114: file main.c, line 4.
(gdb) c
Continuing.

Program received signal SIGTRAP, Trace/breakpoint trap.
0x00000116 in multiply (a=25, b=8) at main.c:4
4        return a * b;
(gdb) bt
#0  0x00000116 in multiply (a=25, b=8) at main.c:4
#1  0x01e00000 in ?? ()
(gdb) q
A debugging session is active.

    Inferior 1 [Remote target] will be killed.

Quit anyway? (y or n)

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