/* * Stack trace management functions * * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> */ #include <linux/sched.h> #include <linux/stacktrace.h> #include <linux/module.h> #include <asm/stacktrace.h> static void save_stack_warning(void *data, char *msg) { } static void save_stack_warning_symbol(void *data, char *msg, unsigned long symbol) { } static int save_stack_stack(void *data, char *name) { return -1; } static void save_stack_address(void *data, unsigned long addr, int reliable) { struct stack_trace *trace = data; if (!reliable) return; if (trace->skip > 0) { trace->skip--; return; } if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = addr; } static void save_stack_address_nosched(void *data, unsigned long addr, int reliable) { struct stack_trace *trace = (struct stack_trace *)data; if (!reliable) return; if (in_sched_functions(addr)) return; if (trace->skip > 0) { trace->skip--; return; } if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = addr; } static const struct stacktrace_ops save_stack_ops = { .warning = save_stack_warning, .warning_symbol = save_stack_warning_symbol, .stack = save_stack_stack, .address = save_stack_address, }; static const struct stacktrace_ops save_stack_ops_nosched = { .warning = save_stack_warning, .warning_symbol = save_stack_warning_symbol, .stack = save_stack_stack, .address = save_stack_address_nosched, }; /* * Save stack-backtrace addresses into a stack_trace buffer. */ void save_stack_trace(struct stack_trace *trace) { dump_trace(current, NULL, NULL, 0, &save_stack_ops, 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, NULL, NULL, 0, &save_stack_ops_nosched, trace); if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = ULONG_MAX; } EXPORT_SYMBOL_GPL(save_stack_trace_tsk);