anjiahao1 opened a new pull request, #15199:
URL: https://github.com/apache/nuttx/pull/15199
## Summary
use cfi in irq asm function, make a debug frame
## Impact
debug, if do backtrace in irq
## Testing
test code hello_main
```
int main(int argc, FAR char *argv[])
{
uint32_t *p = 0xdeedbeff;
*p = 0xffffff;
printf("%p\n %x\n", p, *p);
return 0;
}
```
qemu mps3-an547 hello_main :
Triggering an exception, and gdb backtrace is:
before:
```
(gdb) bt
#0 0x0001168a in systick_getstatus (lower_=0x100010c <g_systick_lower>,
status=0x1000a30 <g_intstackalloc+1600>)
at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_systick.c:142
#1 0x000122f4 in current_usec () at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_timer.c:105
#2 0x0001234c in udelay_accurate (microseconds=250000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_timer.c:115
#3 0x000124bc in up_udelay (microseconds=250000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_timer.c:463 #4 0x0001249e
in up_mdelay (milliseconds=250) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_timer.c:446 #5 0x0000920c
in reset_board () at /home/ajh/work/vela_system/nuttx/sched/misc/assert.c:830
#6 0x0000937c in _assert (filename=0x393f8
"/arch/arm/src/armv8-m/arm_busfault.c", linenum=113, msg=0x393f0 "panic",
regs=0x1008500)
at /home/ajh/work/vela_system/nuttx/sched/misc/assert.c:940
#7 0x00000e2c in arm_busfault (irq=3, context=0x1008500, arg=0x0
<up_ndelay>) at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_busfault.c:113
#8 0x000012d2 in arm_hardfault (irq=3, context=0x1008500, arg=0x0
<up_ndelay>)
at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_hardfault.c:142
#9 0x00008b20 in irq_dispatch (irq=3, context=0x1008500) at
/home/ajh/work/vela_system/nuttx/sched/irq/irq_dispatch.c:145
#10 0x0000041a in arm_doirq (irq=3, regs=0x1008500) at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_doirq.c:103
#11 0x0000034e in exception_common () at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_exception.S:224
```
after:
```
(gdb) bt
#0 systick_is_running () at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_systick.c:106
#1 0x000125c0 in systick_getstatus (lower_=0x1000114 <g_systick_lower>,
status=0x1007a20)
at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_systick.c:141
#2 0x0001323c in current_usec () at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_timer.c:105
#3 0x00013294 in udelay_accurate (microseconds=250000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_timer.c:115
#4 0x00013404 in up_udelay (microseconds=250000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_timer.c:463 #5 0x000133e6
in up_mdelay (milliseconds=250) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_timer.c:446 #6 0x00008c5c
in reset_board () at /home/ajh/work/vela_system/nuttx/sched/misc/assert.c:816
#7 0x00008e88 in _assert (filename=0x39408
"/arch/arm/src/armv8-m/arm_busfault.c", linenum=113, msg=0x39400 "panic",
regs=0x1007cf0)
at /home/ajh/work/vela_system/nuttx/sched/misc/assert.c:915
#8 0x00000ce4 in arm_busfault (irq=3, context=0x1007cf0, arg=0x0
<up_ndelay>)
at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_busfault.c:113
#9 0x0000118a in arm_hardfault (irq=3, context=0x1007cf0, arg=0x0
<up_ndelay>)
at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_hardfault.c:142
#10 0x000086cc in irq_dispatch (irq=3, context=0x1007cf0) at
/home/ajh/work/vela_system/nuttx/sched/irq/irq_dispatch.c:145
#11 0x0000041e in arm_doirq (irq=3, regs=0x1007cf0) at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_doirq.c:99
#12 0x00000360 in exception_common () at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv8-m/arm_exception.S:230
#13 0x00027a8c in hello_main (argc=1, argv=0x1006e20) at
/home/ajh/work/vela_system/apps/examples/hello/hello_main.c:39
#14 0x00014968 in nxtask_startup (entrypt=0x27a7d <hello_main>, argc=1,
argv=0x1006e20)
at /home/ajh/work/vela_system/nuttx/libs/libc/sched/task_startup.c:72
#15 0x0000f450 in nxtask_start () at
/home/ajh/work/vela_system/nuttx/sched/task/task_start.c:116 /#16 0x00000000 in
?? ()
(gdb)
```
qemu armv7a nsh, hello_main:
before:
```
(gdb) bt
#0 udelay_coarse (microseconds=156000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_alarm.c:67
#1 up_ndelay (nanoseconds=nanoseconds@entry=250000000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_alarm.c:431
#2 0x0060c630 in up_udelay (microseconds=microseconds@entry=250000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_alarm.c:416
#3 0x0060c644 in up_mdelay (milliseconds=milliseconds@entry=250) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_alarm.c:401
#4 0x006056bc in reset_board () at
/home/ajh/work/vela_system/nuttx/sched/misc/assert.c:816
#5 _assert (filename=filename@entry=0x63047f
"/arch/arm/src/armv7-a/arm_dataabort.c", linenum=linenum@entry=157,
msg=msg@entry=0x62f56d "panic",
regs=<optimized out>, regs@entry=0x4020af10) at
/home/ajh/work/vela_system/nuttx/sched/misc/assert.c:915
#6 0x0060bd74 in arm_dataabort (regs=0x4020af10, dfar=<optimized out>,
dfsr=<optimized out>)
at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv7-a/arm_dataabort.c:157
#7 0x0060bc04 in arm_vectordata () at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv7-a/arm_vectors.S:438
Backtrace stopped: previous frame identical to this frame (corrupt stack?) (gdb)
```
after:
```
(gdb) bt
#0 udelay_coarse (microseconds=192000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_alarm.c:67
#1 up_ndelay (nanoseconds=nanoseconds@entry=250000000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_alarm.c:431
#2 0x0060c650 in up_udelay (microseconds=microseconds@entry=250000) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_alarm.c:416
#3 0x0060c664 in up_mdelay (milliseconds=milliseconds@entry=250) at
/home/ajh/work/vela_system/nuttx/drivers/timers/arch_alarm.c:401
#4 0x006056bc in reset_board () at
/home/ajh/work/vela_system/nuttx/sched/misc/assert.c:816
#5 _assert (filename=filename@entry=0x63047f
"/arch/arm/src/armv7-a/arm_dataabort.c", linenum=linenum@entry=157,
msg=msg@entry=0x62f56d "panic",
regs=<optimized out>, regs@entry=0x4020af10) at
/home/ajh/work/vela_system/nuttx/sched/misc/assert.c:915
#6 0x0060bd94 in arm_dataabort (regs=0x4020af10, dfar=<optimized out>,
dfsr=<optimized out>)
at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv7-a/arm_dataabort.c:157
#7 0x0060bc08 in arm_vectordata () at
/home/ajh/work/vela_system/nuttx/arch/arm/src/armv7-a/arm_vectors.S:453
#8 0x00620cd4 in hello_main (argc=4999, argv=0x0) at
/home/ajh/work/vela_system/apps/examples/hello/hello_main.c:41 #9 0x0060d320
in nxtask_startup (entrypt=0x620cc4 <hello_main>, argc=1, argv=0x4020a088)
at /home/ajh/work/vela_system/nuttx/libs/libc/sched/task_startup.c:72
#10 0x00609b50 in nxtask_start () at
/home/ajh/work/vela_system/nuttx/sched/task/task_start.c:116 /#11 0x00000000 in
?? ()
```
qemu risc-v nsh
before:
```
(gdb) bt
#0 udelay_coarse (microseconds=228000, microseconds@entry=891896832) at
timers/arch_alarm.c:67
#1 up_ndelay (nanoseconds=nanoseconds@entry=250000000) at
timers/arch_alarm.c:431
#2 0x8000397e in up_udelay (microseconds=microseconds@entry=250000) at
timers/arch_alarm.c:416
#3 0x80003988 in up_mdelay (milliseconds=milliseconds@entry=250) at
timers/arch_alarm.c:401
#4 0x80011f1c in reset_board () at misc/assert.c:813
#5 0x80011f7a in _assert (filename=filename@entry=0x0,
linenum=linenum@entry=0, msg=msg@entry=0x8002114c "panic", regs=<optimized out>,
regs@entry=0x80030704) at misc/assert.c:915
#6 0x80006ad6 in riscv_exception (mcause=<optimized out>, regs=0x80030704,
args=<optimized out>) at common/riscv_exception.c:129 /#7 0x80000d9e in
riscv_doirq (irq=7, regs=<optimized out>) at common/riscv_doirq.c:99 #8
0x80000164 in exception_common () at common/riscv_exception_common.S:210
Backtrace stopped: frame did not save the PC
(gdb)
```
after
```
(gdb) bt
#0 0x80003922 in udelay_coarse (microseconds=90000,
microseconds@entry=891896832) at timers/arch_alarm.c:67 #1 up_ndelay
(nanoseconds=nanoseconds@entry=250000000) at timers/arch_alarm.c:431
#2 0x8000397e in up_udelay (microseconds=microseconds@entry=250000) at
timers/arch_alarm.c:416
#3 0x80003988 in up_mdelay (milliseconds=milliseconds@entry=250) at
timers/arch_alarm.c:401
#4 0x80011f2a in reset_board () at misc/assert.c:816 /#5 0x80011f7a in
_assert (filename=filename@entry=0x0, linenum=linenum@entry=0,
msg=msg@entry=0x8002114c "panic", regs=<optimized out>,
regs@entry=0x80030704) at misc/assert.c:915
#6 0x80006ad6 in riscv_exception (mcause=<optimized out>, regs=0x80030704,
args=<optimized out>) at common/riscv_exception.c:129
#7 0x80000d9e in riscv_doirq (irq=7, regs=<optimized out>) at
common/riscv_doirq.c:99
#8 0x80000166 in exception_common () at common/riscv_exception_common.S:215
#9 0x8001792a in hello_main (argc=<optimized out>, argv=<optimized out>) at
hello_main.c:41
#10 0x80004b52 in nxtask_startup (entrypt=0x80030704, argc=1,
argv=0x800300e8) at sched/task_startup.c:72
#11 0x80001e72 in nxtask_start () at task/task_start.c:116 /#12 0x00000000
in ?? ()
Backtrace stopped: frame did not save the PC
(gdb)
```
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