XuNeo opened a new pull request, #14135:
URL: https://github.com/apache/nuttx/pull/14135
## Summary
Need to save the regs firstly in case syslog triggers another crash.
Otherwise we may loose the register contents for the first exception.
## Impact
Now we have better chance to catch root cause for termination.
## Testing
Test on armv7-a qemu.
Modify hello_main.c to inject the fault.
```c
int main(int argc, FAR char *argv[])
{
printf("Hello, World!!\n");
static const uint32_t instruction = 0x12345678;
((void (*)(void))&instruction)();
return 0;
}
```
Compile and Execute:
```
cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -Bbuild -GNinja
-DBOARD_CONFIG=boards/arm/qemu/qemu-armv7a/configs/nsh nuttx
ninja -C build
qemu-system-arm -cpu cortex-a7 -nographic -machine
virt,virtualization=off,gic-version=2 -net none -chardev stdio,id=con,mux=on
-serial chardev:con -mon chardev=con,mode=readline -kernel build/nuttx -gdb
tcp::1127
nsh> hello &
```
Connect to target using GDB
```
gdb-multiarch build/nuttx -ex "tar rem:1127"
```
Execute `bt` will show the callstack in interrupt.
```shell
(gdb) bt
#0 arm_timer_get_freq () at
/home/neo/projects/nuttx/nuttx/arch/arm/src/armv7-a/arm_timer.c:289
#1 0x4010be90 in arm_timer_current (lower_=<optimized out>, ts=0x40142c90)
at /home/neo/projects/nuttx/nuttx/arch/arm/src/armv7-a/arm_timer.c:249
#2 0x4010c4b8 in ndelay_accurate (nanoseconds=<optimized out>) at
/home/neo/projects/nuttx/nuttx/drivers/timers/arch_alarm.c:65
#3 up_ndelay (nanoseconds=<optimized out>) at
/home/neo/projects/nuttx/nuttx/drivers/timers/arch_alarm.c:447
#4 0x4010c5b8 in up_udelay (microseconds=microseconds@entry=250000)
at /home/neo/projects/nuttx/nuttx/drivers/timers/arch_alarm.c:430
#5 0x4010c5cc in up_mdelay (milliseconds=milliseconds@entry=250)
at /home/neo/projects/nuttx/nuttx/drivers/timers/arch_alarm.c:415
#6 0x401067e4 in reset_board () at
/home/neo/projects/nuttx/nuttx/sched/misc/assert.c:781
#7 _assert (filename=filename@entry=0x4012f08a
"/arch/arm/src/armv7-a/arm_undefinedinsn.c", linenum=linenum@entry=61,
msg=msg@entry=0x4012e3bd "panic", regs=<optimized out>,
regs@entry=0x40142db8)
at /home/neo/projects/nuttx/nuttx/sched/misc/assert.c:878
#8 0x4010bd90 in arm_undefinedinsn (regs=0x40142db8)
at
/home/neo/projects/nuttx/nuttx/arch/arm/src/armv7-a/arm_undefinedinsn.c:61
#9 0x401014b8 in arm_vectorundefinsn () at
/home/neo/projects/nuttx/nuttx/arch/arm/src/armv7-a/arm_vectors.S:603
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)
```
Load GDB Plugin and restore user registers(previously stored in
`up_set_current_regs(regis)`)
```
(gdb) source nuttx/tools/gdb/__init__.py
(gdb) nxsetregs
(gdb) bt
#0 0x40138e98 in __FUNCTION__.0 ()
#1 0x40120040 in hello_main (argc=<optimized out>, argv=<optimized out>) at
/home/neo/projects/nuttx/apps/examples/hello/hello_main.c:41
#2 0x4010d150 in nxtask_startup (entrypt=0x40120030 <hello_main>, argc=1,
argv=0x40141f30) at
/home/neo/projects/nuttx/nuttx/libs/libc/sched/task_startup.c:72
#3 0x40109c38 in nxtask_start () at
/home/neo/projects/nuttx/nuttx/sched/task/task_start.c:116
#4 0x00000000 in ?? ()
(gdb)
```
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