diff options
author | Qing Zhang <zhangqing@loongson.cn> | 2022-08-06 16:10:02 +0800 |
---|---|---|
committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-08-12 13:10:11 +0800 |
commit | 49232773d8233ed70c4998851bc84e465fc1c788 (patch) | |
tree | eb361dbb849c68b079022e025e755cdb17a1f10c /arch/loongarch/kernel/traps.c | |
parent | dce6098b22d58e5b646b1c67174c53f5a6a05605 (diff) |
LoongArch: Add guess unwinder support
Name "guess unwinder" comes from x86, it scans the stack and reports
every kernel text address it finds.
Unwinders can be used by dump_stack() and other stacktrace functions.
Three stages when we do unwind,
1) unwind_start(), the prapare of unwinding, fill unwind_state.
2) unwind_done(), judge whether the unwind process is finished or not.
3) unwind_next_frame(), unwind the next frame.
Add get_stack_info() to get stack info. At present we have irq stack and
task stack. The next_sp is the key info between two types of stacks.
Dividing unwinder helps to add new unwinders in the future.
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kernel/traps.c')
-rw-r--r-- | arch/loongarch/kernel/traps.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c index 1bf58c65e2bf..f65fdf90d29e 100644 --- a/arch/loongarch/kernel/traps.c +++ b/arch/loongarch/kernel/traps.c @@ -43,6 +43,7 @@ #include <asm/stacktrace.h> #include <asm/tlb.h> #include <asm/types.h> +#include <asm/unwind.h> #include "access-helper.h" @@ -64,19 +65,17 @@ static void show_backtrace(struct task_struct *task, const struct pt_regs *regs, const char *loglvl, bool user) { unsigned long addr; - unsigned long *sp = (unsigned long *)(regs->regs[3] & ~3); + struct unwind_state state; + struct pt_regs *pregs = (struct pt_regs *)regs; + + if (!task) + task = current; printk("%sCall Trace:", loglvl); -#ifdef CONFIG_KALLSYMS - printk("%s\n", loglvl); -#endif - while (!kstack_end(sp)) { - if (__get_addr(&addr, sp++, user)) { - printk("%s (Bad stack address)", loglvl); - break; - } - if (__kernel_text_address(addr)) - print_ip_sym(loglvl, addr); + for (unwind_start(&state, task, pregs); + !unwind_done(&state); unwind_next_frame(&state)) { + addr = unwind_get_return_address(&state); + print_ip_sym(loglvl, addr); } printk("%s\n", loglvl); } |