diff options
| author | Qing Zhang <zhangqing@loongson.cn> | 2022-08-06 16:10:04 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-08-12 13:10:11 +0800 |
| commit | 93a4fa622eb061f75f87f0cf9609ab4e69c67d01 (patch) | |
| tree | d49f5b01e8a2299424b31d9344101dc5b5a561d7 /arch/loongarch/kernel/process.c | |
| parent | 49aef111e2dae176a7708b532118f33f24289248 (diff) | |
LoongArch: Add STACKTRACE support
1. Use common arch_stack_walk() infrastructure to avoid duplicated code
and avoid taking care of the stack storage and filtering.
2. Add sched_ra (means sched return address) and sched_cfa (means sched
call frame address) to thread_info, and store them in switch_to().
3. Add __get_wchan() implementation.
Now we can print the process stack and wait channel by cat /proc/*/stack
and /proc/*/wchan.
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kernel/process.c')
| -rw-r--r-- | arch/loongarch/kernel/process.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/arch/loongarch/kernel/process.c b/arch/loongarch/kernel/process.c index 839f0e963152..660492f064e7 100644 --- a/arch/loongarch/kernel/process.c +++ b/arch/loongarch/kernel/process.c @@ -135,6 +135,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) childregs = (struct pt_regs *) childksp - 1; /* Put the stack after the struct pt_regs. */ childksp = (unsigned long) childregs; + p->thread.sched_cfa = 0; p->thread.csr_euen = 0; p->thread.csr_crmd = csr_read32(LOONGARCH_CSR_CRMD); p->thread.csr_prmd = csr_read32(LOONGARCH_CSR_PRMD); @@ -145,6 +146,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) p->thread.reg23 = (unsigned long)args->fn; p->thread.reg24 = (unsigned long)args->fn_arg; p->thread.reg01 = (unsigned long)ret_from_kernel_thread; + p->thread.sched_ra = (unsigned long)ret_from_kernel_thread; memset(childregs, 0, sizeof(struct pt_regs)); childregs->csr_euen = p->thread.csr_euen; childregs->csr_crmd = p->thread.csr_crmd; @@ -161,6 +163,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) p->thread.reg03 = (unsigned long) childregs; p->thread.reg01 = (unsigned long) ret_from_fork; + p->thread.sched_ra = (unsigned long) ret_from_fork; /* * New tasks lose permission to use the fpu. This accelerates context @@ -181,7 +184,31 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) unsigned long __get_wchan(struct task_struct *task) { - return 0; + unsigned long pc; + struct unwind_state state; + + if (!try_get_task_stack(task)) + return 0; + + unwind_start(&state, task, NULL); + state.sp = thread_saved_fp(task); + get_stack_info(state.sp, state.task, &state.stack_info); + state.pc = thread_saved_ra(task); +#ifdef CONFIG_UNWINDER_PROLOGUE + state.type = UNWINDER_PROLOGUE; +#endif + for (; !unwind_done(&state); unwind_next_frame(&state)) { + pc = unwind_get_return_address(&state); + if (!pc) + break; + if (in_sched_functions(pc)) + continue; + break; + } + + put_task_stack(task); + + return pc; } bool in_irq_stack(unsigned long stack, struct stack_info *info) |