masayuki2009 commented on pull request #5645:
URL: https://github.com/apache/incubator-nuttx/pull/5645#issuecomment-1059113053
@anchao
The original issue with sabre-6quad:netknsh (QEMU) still happens.
You can try the latest my branches with your patches.
Please note that gcc-arm-none-eabi-9-2020-q2-update must be used, because
I'm still not sure why the gcc-arm-none-eabi-10.3-2021.10 causes the undefined
instruction issue.
```
[ 15.740000] up_addrenv_select: addrenv=0x10843f24 oldenv=0x10847330
[ 15.740000] up_addrenv_select: text: set l1 entry (paddr=1811d000
vaddr=80000000)
[ 15.740000] up_addrenv_select: data: set l1 entry (paddr=18122000
vaddr=80100000)
[ 15.750000] up_addrenv_select: heap: set l1 entry (paddr=18124000
vaddr=80200000)
[ 15.750000] exec_module: Initialize the user heap (heapsize=1048576)
[ 15.760000] up_addrenv_kstackalloc: tcb=0x10847430 stacksize=3072
[ 15.760000] up_addrenv_clone: src=0x10843f24 dest=0x10843fc8
[ 15.760000] up_addrenv_restore: oldenv=0x10847330
[ 15.770000] up_addrenv_select: addrenv=0x10843fc8 oldenv=0
[ 15.770000] up_addrenv_select: text: set l1 entry (paddr=1811d000
vaddr=80000000)
[ 15.770000] up_addrenv_select: data: set l1 entry (paddr=18122000
vaddr=80100000)
[ 15.770000] up_addrenv_select: heap: set l1 entry (paddr=18124000
vaddr=80200000)
Set thread priority to 10
Set thread policy to SCHED_RR
Start thread #0
[ 15.780000] up_addrenv_attach: group=0x10843f80 tcb=0x10847430
[ 15.780000] up_addrenv_kstackalloc: tcb=0x108475d0 stacksize=3072
thread #0 started, looking for primes < 10000, doing 10 run(s)
[ 17.600000] arm_dataabort: Data abort. PC: 80001bb2 DFAR: 1084361c DFSR:
0000000d
[ 17.600000] up_assert: Assertion failed at file:armv7-a/arm_dataabort.c
line: 161 task: lpwork
[ 17.600000] arm_registerdump: R0: 80204698 R1: 1084360c R2: 80204698 R3:
1084360c
[ 17.600000] arm_registerdump: R4: 00000000 R5: 00000000 R6: 00000000 FP:
80204678
[ 17.600000] arm_registerdump: R8: 00000000 SB: 00000000 SL: 00000000 R11:
00000000
[ 17.600000] arm_registerdump: IP: 10807693 SP: 80204678 LR: 80001725 PC:
80001bb2
...
```
The text region of the getprime (elf) starts at 0x8000:0000,
So, the `PC: 80001bb2` means the offset is 0x1bb2.
It seems that the exception happened in lib_stdoutstream() which is linked
with getprime.
As you can see from the register dump, `R3: 1084360c` shows the address in
the kernel area.
That's why the dataabort happened.
Here, r3 is loaded from `[r7, #0]` and r7 `FP: 80204678` shows the address
is in the userland heap (i.e. user stack), so this might be correct but its
content (i.e. the variable `stream`) is corrupted.
```
void lib_stdoutstream(FAR struct lib_stdoutstream_s *outstream,
FAR FILE *stream)
{
1b9a: b480 push {r7}
1b9c: b083 sub sp, #12
1b9e: af00 add r7, sp, #0
1ba0: 6078 str r0, [r7, #4]
1ba2: 6039 str r1, [r7, #0]
/* Select the put operation */
outstream->public.put = stdoutstream_putc;
1ba4: 687a ldr r2, [r7, #4]
1ba6: f240 0300 movw r3, #0
1ba6: R_ARM_THM_MOVW_ABS_NC stdoutstream_putc
1baa: f2c0 0300 movt r3, #0
1baa: R_ARM_THM_MOVT_ABS stdoutstream_putc
1bae: 6013 str r3, [r2, #0]
* opened in binary mode. In binary mode, the newline has no special
* meaning.
*/
#ifndef CONFIG_STDIO_DISABLE_BUFFERING
if (stream->fs_bufstart != NULL && (stream->fs_oflags & O_BINARY) == 0)
1bb0: 683b ldr r3, [r7, #0]
1bb2: 691b ldr r3, [r3, #16] <== here
1bb4: 2b00 cmp r3, #0
1bb6: d00d beq.n 1bd4 <lib_stdoutstream+0x3a>
1bb8: 683b ldr r3, [r7, #0]
1bba: f8b3 3060 ldrh.w r3, [r3, #96] ; 0x60
1bbe: f403 7380 and.w r3, r3, #256 ; 0x100
1bc2: 2b00 cmp r3, #0
1bc4: d106 bne.n 1bd4 <lib_stdoutstream+0x3a>
{
outstream->public.flush = stdoutstream_flush;
1bc6: 687a ldr r2, [r7, #4]
1bc8: f240 0300 movw r3, #0
1bc8: R_ARM_THM_MOVW_ABS_NC stdoutstream_flush
1bcc: f2c0 0300 movt r3, #0
1bcc: R_ARM_THM_MOVT_ABS stdoutstream_flush
1bd0: 6093 str r3, [r2, #8]
1bd2: e005 b.n 1be0 <lib_stdoutstream+0x46>
}
else
```
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