Backtrace limited to caller and callee when debugging on SPARC

[Alexandre BERZATI <alexandre dot berzati at invia dot fr>]

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Hello,

I cross-compiled GDB 7.2 source files for a sparc-elf target and I
noticed some trouble in using the backtrace command for debugging.
Although the backtrace is expected to output the whole call tree, it
only prints the last caller and callee's frames. For instance, I
compiled the following file with a cross-compiled GCC 4.5.1 with no
optimization (-O0) and full debug information (-g3):

typedef struct list {
  int value;
  short suiv;
} list;

int function_test_2 (int c)
{
	int j;

	for (j=0; j < 100; j++)
		c+=c;

	return 0;
}

int function_test (list* liste)
{
  function_test_2 (liste->value);
  return liste->value;
}

int foo (int a, char b)
{
  int i;
  list liste;
   for (i = 0 ; i < a; i++)
     b*=b;
   liste.value = b;
   printf ("Value = %d\n", liste.suiv);

   function_test (&liste);
   return b+a;
}

int main ()
{
  int a = 6, b=7;
  foo (a, b);
  return(0);
};

The object code is executed on a simulated SPARC machine and debug in
remote with sparc-elf-gdb. Then, if I put a breakpoint on
"function_test_2" and display the backtrace at this time, sparc-elf-gdb
outputs:

#0  function_test_2 (c=1) at src/main.c:12
        j = 100
#1  0x4000129c in function_test (liste=0x0) at src/main.c:21
No locals.
... entries for foo() and main() are missing.

I suppose that a bug may compromise the debug frame building. Since
"sparc-elf-gdb" build from GDB 6.4 works fine, I suppose that this bug
has been introduced in recent versions of GDB (7.x)

Thank you guys for the help.

Alex.
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