Ish: GDB does not work

[ghanan94]

I tried to install gdb with the hope of debugging why tmux wouldn’t work (another issue I submitted) and found out that gdb doesn’t work either :(

# apk add gdb
...
# gdb tmux
Segmentation Fault
# gdb -h
Segmentation Fault
# gdb
Segmentation Fault
#

[tbodt]

I've never tried to run gdb so I'm not surprised this happens. In any case, gdb relies on ptrace which is totally unimplemented.

[Mnpn03]

Device:~# apk add gdb
OK: 92 MiB in 45 packages
Device:~# gdb
Segmentation fault
Device:~# dmesg
FIXME socketcall 16
13 page fault on 0x50 at 0x567336fd

[Mnpn03]

This seems to work now. It runs and seems to work fine on TestFlight build 45, but I haven't tried it any more than that.

[tbodt]

It's not likely to work as well when you start trying to actually debug something though

[Mnpn03]

Correct. Bad system call. dmesg crashed iSH once after that, but I cannot replicate it again.

[ntindle]

34 missing syscall 136 When debugging hello world.

#include <stdio.h>
int main()
{
   printf("Hello, World!");
   return 0;
}

If saved as prog1.c

gcc  -Wall -Werror -ansi -pedantic-error
s -g prog1.c -o prog1.x
gdb prog1.x

```
Reading symbols from prog1.x...
(gdb) run

[saagarjha]

Should be fixed by #736, so closing this for now. Much of ptrace is still unimplemented, but you should be able to debug simple single-threaded programs now.

If you find something specific that's broken (hangs, strange errors) while debugging, feel free to make an issue for that.