On 08/30/13 08:58 AM, Sebastian Huber wrote:
On 2013-08-28 23:30, Karel Gardas wrote:
_Internal_error_Occurred (the_source=RTEMS_FATAL_SOURCE_EXCEPTION,
is_internal=false, the_error=536875260)
If you get an exception like this, then you can use in GDB to figure out
the context (the actual program counter of the exception is not the
direct value of register_pc):
Breakpoint 6, _Internal_error_Occurred
(the_source=RTEMS_FATAL_SOURCE_EXCEPTION, is_internal=false,
the_error=1049524) at
../../../../../../rtems/c/src/../../cpukit/score/src/interr.c:35
35 _User_extensions_Fatal( the_source, is_internal, the_error );
(gdb) p/x *(CPU_Exception_frame *)the_error
$1 = {
Thanks for this nice trick!
(gdb) p/x *(CPU_Exception_frame *)the_error
$2 = {register_r0 = 0x20006acc, register_r1 = 0x1a010004, register_r2 =
0x0, register_r3 = 0x1a010003, register_r4 = 0x20006ab8, register_r5 =
0x20001794, register_r6 = 0x20006d80, register_r7 = 0x20003c70,
register_r8 = 0x20003e7c, register_r9 = 0x20001440, register_r10 = 0x0,
register_r11 = 0x18fc0, register_r12 = 0x0, register_sp = 0x0,
register_lr = 0xe57b, register_pc = 0xe584, register_xpsr = 0x21000000,
vector = 0x3, vfp_context = 0x1}
(gdb) dis 0xe584
warning: bad breakpoint number at or near '0xe584'
(gdb) disas 0xe584
Dump of assembler code for function _Chain_Get_first_unprotected:
0x0000e56c <+0>: push {r7, lr}
0x0000e56e <+2>: sub sp, #24
0x0000e570 <+4>: add r7, sp, #0
0x0000e572 <+6>: str r0, [r7, #4]
0x0000e574 <+8>: ldr r0, [r7, #4]
0x0000e576 <+10>: bl 0xe4d8 <_Chain_Head>
0x0000e57a <+14>: str r0, [r7, #20]
0x0000e57c <+16>: ldr r3, [r7, #20]
0x0000e57e <+18>: ldr r3, [r3, #0]
0x0000e580 <+20>: str r3, [r7, #16]
0x0000e582 <+22>: ldr r3, [r7, #16]
0x0000e584 <+24>: ldr r3, [r3, #0]
0x0000e586 <+26>: str r3, [r7, #12]
0x0000e588 <+28>: ldr r3, [r7, #20]
0x0000e58a <+30>: ldr r2, [r7, #12]
0x0000e58c <+32>: str r2, [r3, #0]
0x0000e58e <+34>: ldr r3, [r7, #12]
0x0000e590 <+36>: ldr r2, [r7, #20]
0x0000e592 <+38>: str r2, [r3, #4]
0x0000e594 <+40>: ldr r3, [r7, #16]
0x0000e596 <+42>: mov r0, r3
0x0000e598 <+44>: add.w r7, r7, #24
0x0000e59c <+48>: mov sp, r7
0x0000e59e <+50>: pop {r7, pc}
End of assembler dump.
So it looks like I've debugged well and got up to the culprit. Now the
question is why this ldr fails...
Thanks,
Karel
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