| /* |
| * Stack trace management functions |
| * |
| * Copyright (C) 2009 Helge Deller <deller@gmx.de> |
| * based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com> |
| * and parisc unwind functions by Randolph Chung <tausq@debian.org> |
| * |
| * TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT) |
| */ |
| #include <linux/module.h> |
| #include <linux/stacktrace.h> |
| |
| #include <asm/unwind.h> |
| |
| static void dump_trace(struct task_struct *task, struct stack_trace *trace) |
| { |
| struct unwind_frame_info info; |
| |
| unwind_frame_init_task(&info, task, NULL); |
| |
| /* unwind stack and save entries in stack_trace struct */ |
| trace->nr_entries = 0; |
| while (trace->nr_entries < trace->max_entries) { |
| if (unwind_once(&info) < 0 || info.ip == 0) |
| break; |
| |
| if (__kernel_text_address(info.ip)) |
| trace->entries[trace->nr_entries++] = info.ip; |
| } |
| } |
| |
| |
| /* |
| * Save stack-backtrace addresses into a stack_trace buffer. |
| */ |
| void save_stack_trace(struct stack_trace *trace) |
| { |
| dump_trace(current, trace); |
| if (trace->nr_entries < trace->max_entries) |
| trace->entries[trace->nr_entries++] = ULONG_MAX; |
| } |
| EXPORT_SYMBOL_GPL(save_stack_trace); |
| |
| void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) |
| { |
| dump_trace(tsk, trace); |
| if (trace->nr_entries < trace->max_entries) |
| trace->entries[trace->nr_entries++] = ULONG_MAX; |
| } |
| EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |