Hi all,
I'm running littlekernel aarch64-elf in qemu. I've got the gdb stub
running and I've connected to it from gdb. I'm able to set breakpoints,
run, step and inspect variables. Unfortunately, when the kernel panics,
the callstack I get isn't very useful.
1 uart_pgetc uart.c 158 0xffff000000011dd0
2 platform_pgetc debug.c 48 0xffff000000011970
3 __panic_stdio_read debug.c 54 0xffff0000000401e0
4 __panic_stdio_read debug.c 50 0xffff0000000401e0
5 getc stdio.c 66 0xffff000000044ad0
6 read_line_panic console.c 866 0xffff000000040030
7 panic_shell_start console.c 866 0xffff000000040030
8 platform_halt power.c 32 0xffff0000000396fc
9 _panic debug.c 35 0xffff0000000402c0
10 arm64_sync_exception exceptions_c.c 101 0xffff0000000121fc
11 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
12 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
13 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
14 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
15 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
16 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
17 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
18 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
19 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
20 arm64_sync_exc_current_el_SPx exceptions.S 145 0xffff00000001125c
... <More>
/* exceptions from current EL, using SPx */
.org 0x200
LOCAL_FUNCTION(arm64_sync_exc_current_el_SPx)
regsave_long
mov x0, sp
bl arm64_sync_exception
b arm64_exc_shared_restore_long
https://github.com/littlekernel/lk
How do I get the gdb stub to stop in the debugger at the exception point,
rather than in the exception handler?
Thanks!
--
Vince Harron | Software Engineer | vhar...@google.com | 858-442-0868
