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 25*bc850d6bSArjan van de Ven static void save_stack_address(void *data, unsigned long addr, int reliable) 26250c2277SThomas Gleixner { 27250c2277SThomas Gleixner struct stack_trace *trace = (struct stack_trace *)data; 28250c2277SThomas Gleixner if (trace->skip > 0) { 29250c2277SThomas Gleixner trace->skip--; 30250c2277SThomas Gleixner return; 31250c2277SThomas Gleixner } 32250c2277SThomas Gleixner if (trace->nr_entries < trace->max_entries) 33250c2277SThomas Gleixner trace->entries[trace->nr_entries++] = addr; 34250c2277SThomas Gleixner } 35250c2277SThomas Gleixner 369745512cSArjan van de Ven static void save_stack_address_nosched(void *data, unsigned long addr) 379745512cSArjan van de Ven { 389745512cSArjan van de Ven struct stack_trace *trace = (struct stack_trace *)data; 399745512cSArjan van de Ven if (in_sched_functions(addr)) 409745512cSArjan van de Ven return; 419745512cSArjan van de Ven if (trace->skip > 0) { 429745512cSArjan van de Ven trace->skip--; 439745512cSArjan van de Ven return; 449745512cSArjan van de Ven } 459745512cSArjan van de Ven if (trace->nr_entries < trace->max_entries) 469745512cSArjan van de Ven trace->entries[trace->nr_entries++] = addr; 479745512cSArjan van de Ven } 489745512cSArjan van de Ven 499689ba8aSJan Beulich static const struct stacktrace_ops save_stack_ops = { 50250c2277SThomas Gleixner .warning = save_stack_warning, 51250c2277SThomas Gleixner .warning_symbol = save_stack_warning_symbol, 52250c2277SThomas Gleixner .stack = save_stack_stack, 53250c2277SThomas Gleixner .address = save_stack_address, 54250c2277SThomas Gleixner }; 55250c2277SThomas Gleixner 569745512cSArjan van de Ven static const struct stacktrace_ops save_stack_ops_nosched = { 579745512cSArjan van de Ven .warning = save_stack_warning, 589745512cSArjan van de Ven .warning_symbol = save_stack_warning_symbol, 599745512cSArjan van de Ven .stack = save_stack_stack, 609745512cSArjan van de Ven .address = save_stack_address_nosched, 619745512cSArjan van de Ven }; 629745512cSArjan van de Ven 63250c2277SThomas Gleixner /* 64250c2277SThomas Gleixner * Save stack-backtrace addresses into a stack_trace buffer. 65250c2277SThomas Gleixner */ 66250c2277SThomas Gleixner void save_stack_trace(struct stack_trace *trace) 67250c2277SThomas Gleixner { 68250c2277SThomas Gleixner dump_trace(current, NULL, NULL, &save_stack_ops, trace); 69250c2277SThomas Gleixner if (trace->nr_entries < trace->max_entries) 70250c2277SThomas Gleixner trace->entries[trace->nr_entries++] = ULONG_MAX; 71250c2277SThomas Gleixner } 729745512cSArjan van de Ven 739745512cSArjan van de Ven void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) 749745512cSArjan van de Ven { 759745512cSArjan van de Ven dump_trace(tsk, NULL, NULL, &save_stack_ops_nosched, trace); 769745512cSArjan van de Ven if (trace->nr_entries < trace->max_entries) 779745512cSArjan van de Ven trace->entries[trace->nr_entries++] = ULONG_MAX; 789745512cSArjan van de Ven } 79