/* * 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);