1250c2277SThomas Gleixner /* 2250c2277SThomas Gleixner * Stack trace management functions 3250c2277SThomas Gleixner * 4250c2277SThomas Gleixner * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> 5250c2277SThomas Gleixner */ 6250c2277SThomas Gleixner #include <linux/sched.h> 7250c2277SThomas Gleixner #include <linux/stacktrace.h> 8250c2277SThomas Gleixner #include <linux/module.h> 9250c2277SThomas Gleixner #include <asm/stacktrace.h> 10250c2277SThomas Gleixner 11250c2277SThomas Gleixner static void save_stack_warning(void *data, char *msg) 12250c2277SThomas Gleixner { 13250c2277SThomas Gleixner } 14250c2277SThomas Gleixner 15250c2277SThomas Gleixner static void 16250c2277SThomas Gleixner save_stack_warning_symbol(void *data, char *msg, unsigned long symbol) 17250c2277SThomas Gleixner { 18250c2277SThomas Gleixner } 19250c2277SThomas Gleixner 20250c2277SThomas Gleixner static int save_stack_stack(void *data, char *name) 21250c2277SThomas Gleixner { 22250c2277SThomas Gleixner return -1; 23250c2277SThomas Gleixner } 24250c2277SThomas Gleixner 25bc850d6bSArjan van de Ven static void save_stack_address(void *data, unsigned long addr, int reliable) 26250c2277SThomas Gleixner { 27ade1af77SJan Engelhardt struct stack_trace *trace = data; 281650743cSVegard Nossum if (!reliable) 291650743cSVegard Nossum return; 30250c2277SThomas Gleixner if (trace->skip > 0) { 31250c2277SThomas Gleixner trace->skip--; 32250c2277SThomas Gleixner return; 33250c2277SThomas Gleixner } 34250c2277SThomas Gleixner if (trace->nr_entries < trace->max_entries) 35250c2277SThomas Gleixner trace->entries[trace->nr_entries++] = addr; 36250c2277SThomas Gleixner } 37250c2277SThomas Gleixner 385bc27dc2SArjan van de Ven static void 395bc27dc2SArjan van de Ven save_stack_address_nosched(void *data, unsigned long addr, int reliable) 409745512cSArjan van de Ven { 419745512cSArjan van de Ven struct stack_trace *trace = (struct stack_trace *)data; 421650743cSVegard Nossum if (!reliable) 431650743cSVegard Nossum return; 449745512cSArjan van de Ven if (in_sched_functions(addr)) 459745512cSArjan van de Ven return; 469745512cSArjan van de Ven if (trace->skip > 0) { 479745512cSArjan van de Ven trace->skip--; 489745512cSArjan van de Ven return; 499745512cSArjan van de Ven } 509745512cSArjan van de Ven if (trace->nr_entries < trace->max_entries) 519745512cSArjan van de Ven trace->entries[trace->nr_entries++] = addr; 529745512cSArjan van de Ven } 539745512cSArjan van de Ven 549689ba8aSJan Beulich static const struct stacktrace_ops save_stack_ops = { 55250c2277SThomas Gleixner .warning = save_stack_warning, 56250c2277SThomas Gleixner .warning_symbol = save_stack_warning_symbol, 57250c2277SThomas Gleixner .stack = save_stack_stack, 58250c2277SThomas Gleixner .address = save_stack_address, 59250c2277SThomas Gleixner }; 60250c2277SThomas Gleixner 619745512cSArjan van de Ven static const struct stacktrace_ops save_stack_ops_nosched = { 629745512cSArjan van de Ven .warning = save_stack_warning, 639745512cSArjan van de Ven .warning_symbol = save_stack_warning_symbol, 649745512cSArjan van de Ven .stack = save_stack_stack, 659745512cSArjan van de Ven .address = save_stack_address_nosched, 669745512cSArjan van de Ven }; 679745512cSArjan van de Ven 68250c2277SThomas Gleixner /* 69250c2277SThomas Gleixner * Save stack-backtrace addresses into a stack_trace buffer. 70250c2277SThomas Gleixner */ 71250c2277SThomas Gleixner void save_stack_trace(struct stack_trace *trace) 72250c2277SThomas Gleixner { 735bc27dc2SArjan van de Ven dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace); 74250c2277SThomas Gleixner if (trace->nr_entries < trace->max_entries) 75250c2277SThomas Gleixner trace->entries[trace->nr_entries++] = ULONG_MAX; 76250c2277SThomas Gleixner } 77*8594698eSIngo Molnar EXPORT_SYMBOL_GPL(save_stack_trace); 789745512cSArjan van de Ven 799745512cSArjan van de Ven void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) 809745512cSArjan van de Ven { 815bc27dc2SArjan van de Ven dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace); 829745512cSArjan van de Ven if (trace->nr_entries < trace->max_entries) 839745512cSArjan van de Ven trace->entries[trace->nr_entries++] = ULONG_MAX; 849745512cSArjan van de Ven } 85*8594698eSIngo Molnar EXPORT_SYMBOL_GPL(save_stack_trace_tsk); 86