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[kernel] Add fake preludes to isr handler to trick GDB

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By adding more debug information to the symbols and adding function
frame preludes to the isr handler assembly functions, GDB sees them as
valid locations for stack frames, and can display backtraces through
interrupts.
This commit is contained in:
Justin C. Miller
2021-02-10 01:10:26 -08:00
parent 31289436f5
commit 70d6094f46
1 changed files with 25 additions and 9 deletions
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34
src/kernel/interrupts.s
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@@ -1,8 +1,14 @@
%include "push_all.inc" %include "push_all.inc"
section .text
extern isr_handler extern isr_handler
global isr_handler_prelude global isr_handler_prelude:function (isr_handler_prelude.end - isr_handler_prelude)
isr_handler_prelude: isr_handler_prelude:
push rbp ; Never executed, fake function prelude
mov rbp, rsp ; to calm down gdb
.real:
push_all push_all
check_swap_gs check_swap_gs
@@ -10,10 +16,15 @@ isr_handler_prelude:
mov rsi, rsp mov rsi, rsp
call isr_handler call isr_handler
jmp isr_handler_return jmp isr_handler_return
.end:
extern irq_handler extern irq_handler
global irq_handler_prelude global irq_handler_prelude:function (irq_handler_prelude.end - irq_handler_prelude)
irq_handler_prelude: irq_handler_prelude:
push rbp ; Never executed, fake function prelude
mov rbp, rsp ; to calm down gdb
.real:
push_all push_all
check_swap_gs check_swap_gs
@@ -21,36 +32,41 @@ irq_handler_prelude:
mov rsi, rsp mov rsi, rsp
call irq_handler call irq_handler
; fall through to isr_handler_return ; fall through to isr_handler_return
.end:
global isr_handler_return global isr_handler_return:function (isr_handler_return.end - isr_handler_return)
isr_handler_return: isr_handler_return:
check_swap_gs check_swap_gs
pop_all pop_all
add rsp, 16 ; because the ISRs added err/num add rsp, 16 ; because the ISRs added err/num
iretq iretq
.end:
%macro EMIT_ISR 2 %macro EMIT_ISR 2
global %1 global %1:function (%1.end - %1)
%1: %1:
push 0 push 0
push %2 push %2
jmp isr_handler_prelude jmp isr_handler_prelude.real
.end:
%endmacro %endmacro
%macro EMIT_EISR 2 %macro EMIT_EISR 2
global %1 global %1:function (%1.end - %1)
%1: %1:
push %2 push %2
jmp isr_handler_prelude jmp isr_handler_prelude.real
.end:
%endmacro %endmacro
%macro EMIT_IRQ 2 %macro EMIT_IRQ 2
global %1 global %1:function (%1.end - %1)
%1: %1:
push 0 push 0
push %2 push %2
jmp irq_handler_prelude jmp irq_handler_prelude.real
.end:
%endmacro %endmacro
%define EISR(i, s, name) EMIT_EISR name, i ; ISR with error code %define EISR(i, s, name) EMIT_EISR name, i ; ISR with error code