I can no longer profile programs with gprof on i386, NetBSD 7.99.26.
The test case is a hello world program:
| #include <stdio.h>
|
| int
| main(void)
| {
| puts("hello world");
| return 0;
| }
which is compiled using cc -g -pg -o helloworld helloworld.c
Here's what happens:
$ gdb ./helloworld
[...]
(gdb) run
Starting program: /home/fstd/helloworld
Program received signal SIGSEGV, Segmentation fault.
0x0805046e in mcount ()
(gdb) bt
#0 0x0805046e in mcount ()
#1 0x08068388 in _libc_init ()
#2 0x080481ea in ___start ()
#3 0x080480f8 in _start ()
(gdb) info registers
eax 0x0 0
ecx 0x8074740 134694720
edx 0x0 0
ebx 0x8074724 134694692
esp 0xbfbfea40 0xbfbfea40
ebp 0x0 0x0
esi 0x0 0
edi 0xbfbffff0 -1077936144
eip 0x805046e 0x805046e <mcount+15>
eflags 0x10282 [ SF IF RF ]
cs 0x17 23
ss 0x1f 31
ds 0x1f 31
es 0x1f 31
fs <unavailable>
gs <unavailable>
(gdb) disassemble
Dump of assembler code for function mcount:
0x0805045f <+0>: push %ebp
0x08050460 <+1>: push %edi
0x08050461 <+2>: push %esi
0x08050462 <+3>: push %ebx
0x08050463 <+4>: sub $0x18,%esp
0x08050466 <+7>: mov %eax,%ebp
0x08050468 <+9>: mov %ecx,0x8(%esp)
0x0805046c <+13>: mov %edx,%esi
=> 0x0805046e <+15>: mov 0x4(%ebp),%ebx
0x08050471 <+18>: mov 0x0(%ebp),%edi
0x08050474 <+21>: mov 0x4(%edi),%edi
0x08050477 <+24>: mov 0x80759e0,%ecx
0x0805047d <+30>: test %ecx,%ecx
0x0805047f <+32>: je 0x805049f <mcount+64>
0x08050481 <+34>: mov 0x8074880,%edx
0x08050487 <+40>: test %edx,%edx
0x08050489 <+42>: je 0x805052f <mcount+208>
[...]
