chirping78 commented on issue #16235:
URL: https://github.com/apache/nuttx/issues/16235#issuecomment-2814452848
Here is the 3rd evidence (recall that the 1st is disassemble of esp32 gdb
and objdump, and 2nd is disassemble of cadence toolchain), this is more serious
than first twos.
Open three terminals:
1. use minicom to access nsh
2. use openocd to setup gdbserver `openocd -c 'set ESP_RTOS none; set
ESP_FLASH_SIZE 0' -f board/esp32s3-builtin.cfg`
3. use gdb to debug `xtensa-esp32s3-elf-gdb nuttx`
```
(gdb) target remote :3333
(gdb) b cmd_uname
(gdb) c
```
run `uname -a` to trigger the breakpoint
set bp at `getopt` then finish from `getopt`
```
(gdb) tb getopt
(gdb) c
(gdb) finish
```
step two instructions, show pc is `0x4201a244`
```
(gdb) si
(gdb) si
(gdb) p/x $pc
$17 = 0x4201a244
```
But, ***you can find `0x4201a244` does not match with disassemble***, there
is no instruction at `0x4201a244`
```
(gdb) disassemble cmd_uname, cmd_uname+32
Dump of assembler code from 0x4201a234 to 0x4201a254:
0x4201a234 <cmd_uname+0>: entry a1, 0x170
0x4201a237 <cmd_uname+3>: movi.n a6, 0
0x4201a239 <cmd_uname+5>: s32i a3, a1, 0x140
0x4201a23c <cmd_uname+8>: mov.n a5, a2
0x4201a23e <cmd_uname+10>: mov.n a3, a6
0x4201a240 <cmd_uname+12>: j 0x4201a290 <cmd_uname+92>
0x4201a243 <cmd_uname+15>: quou a2, a2, a0
0x4201a246 <cmd_uname+18>: ee.vmulas.s8.accx.ld.ip.qup q6, a9,
0x1c0, q4, q2, q5, q7
0x4201a24a <cmd_uname+22>: bltu a0, a3, 0x4201a2bf <cmd_uname+139>
0x4201a24d <cmd_uname+25>: call12 0x4208afe4
0x4201a250 <cmd_uname+28>: movi a2, 40
0x4201a253 <cmd_uname+31>: movi a0, 2
End of assembler dump.
(gdb)
```
This means the gdb can't be used to do serious debugging.
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