| /* |
| * arch/mips/kernel/stacktrace.c |
| * |
| * Stack trace management functions |
| * |
| * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp> |
| */ |
| #include <linux/sched.h> |
| #include <linux/stacktrace.h> |
| #include <asm/stacktrace.h> |
| |
| /* |
| * Save stack-backtrace addresses into a stack_trace buffer: |
| */ |
| static void save_raw_context_stack(struct stack_trace *trace, |
| unsigned long reg29) |
| { |
| unsigned long *sp = (unsigned long *)reg29; |
| unsigned long addr; |
| |
| while (!kstack_end(sp)) { |
| addr = *sp++; |
| if (__kernel_text_address(addr)) { |
| if (trace->skip > 0) |
| trace->skip--; |
| else |
| trace->entries[trace->nr_entries++] = addr; |
| if (trace->nr_entries >= trace->max_entries) |
| break; |
| } |
| } |
| } |
| |
| static void save_context_stack(struct stack_trace *trace, struct pt_regs *regs) |
| { |
| unsigned long sp = regs->regs[29]; |
| #ifdef CONFIG_KALLSYMS |
| unsigned long ra = regs->regs[31]; |
| unsigned long pc = regs->cp0_epc; |
| |
| if (raw_show_trace || !__kernel_text_address(pc)) { |
| unsigned long stack_page = |
| (unsigned long)task_stack_page(current); |
| if (stack_page && sp >= stack_page && |
| sp <= stack_page + THREAD_SIZE - 32) |
| save_raw_context_stack(trace, sp); |
| return; |
| } |
| do { |
| if (trace->skip > 0) |
| trace->skip--; |
| else |
| trace->entries[trace->nr_entries++] = pc; |
| if (trace->nr_entries >= trace->max_entries) |
| break; |
| pc = unwind_stack(current, &sp, pc, &ra); |
| } while (pc); |
| #else |
| save_raw_context_stack(trace, sp); |
| #endif |
| } |
| |
| /* |
| * Save stack-backtrace addresses into a stack_trace buffer. |
| */ |
| void save_stack_trace(struct stack_trace *trace) |
| { |
| struct pt_regs dummyregs; |
| struct pt_regs *regs = &dummyregs; |
| |
| WARN_ON(trace->nr_entries || !trace->max_entries); |
| |
| prepare_frametrace(regs); |
| save_context_stack(trace, regs); |
| } |
| EXPORT_SYMBOL_GPL(save_stack_trace); |