On 2021-02-04, Anindya Mukherjee <anindy...@hotmail.com> wrote: > I'm trying to debug the systat utility for learning purposes. I enabled > -g -O0 in the Makefile, and built it in /usr/src/usr.bin/systat. It > builds and runs fine. However, gdb cannot insert any breakspoints. I'm > on a very recent snapshot and everything is fully patched.
> [Switching to thread 588561] > 0x00000b5f3d6c5c8a in ?? () > (gdb) b engine.c:1156 > Breakpoint 1 at 0x13aca: file engine.c, line 1156. > (gdb) info b > Num Type Disp Enb Address What > 1 breakpoint keep y 0x0000000000013aca in message_set at engine.c:1156 OpenBSD binaries are PIE by default. The low address is before relocation, you will see a similar address if you use "gdb systat" and set a breakpoint before running, but in that case it is updated when the process starts. I'm not sure how to workaround this when attaching to a running process. (It doesn't directly help with this but generally you will have better luck with gdb from ports, the old one in base doesn't cope well with recent compilers. pkg_add gdb and use the egdb binary).
