David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 1 | #include <linux/sched.h> |
| 2 | #include <linux/stacktrace.h> |
| 3 | #include <linux/thread_info.h> |
David S. Miller | 667f0ce | 2010-04-21 03:08:11 -0700 | [diff] [blame] | 4 | #include <linux/ftrace.h> |
Paul Gortmaker | 066bcac | 2011-07-22 13:18:16 -0400 | [diff] [blame] | 5 | #include <linux/export.h> |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 6 | #include <asm/ptrace.h> |
David S. Miller | 85a7935 | 2008-03-24 20:06:24 -0700 | [diff] [blame] | 7 | #include <asm/stacktrace.h> |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 8 | |
David S. Miller | 4f70f7a | 2008-08-12 18:33:56 -0700 | [diff] [blame] | 9 | #include "kstack.h" |
| 10 | |
David S. Miller | 6a5726d | 2008-11-28 01:19:41 -0800 | [diff] [blame] | 11 | static void __save_stack_trace(struct thread_info *tp, |
| 12 | struct stack_trace *trace, |
| 13 | bool skip_sched) |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 14 | { |
David S. Miller | 6f63e78 | 2008-08-13 17:17:52 -0700 | [diff] [blame] | 15 | unsigned long ksp, fp; |
David S. Miller | 667f0ce | 2010-04-21 03:08:11 -0700 | [diff] [blame] | 16 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 17 | struct task_struct *t; |
| 18 | int graph = 0; |
| 19 | #endif |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 20 | |
David S. Miller | 6a5726d | 2008-11-28 01:19:41 -0800 | [diff] [blame] | 21 | if (tp == current_thread_info()) { |
| 22 | stack_trace_flush(); |
| 23 | __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp)); |
| 24 | } else { |
| 25 | ksp = tp->ksp; |
| 26 | } |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 27 | |
| 28 | fp = ksp + STACK_BIAS; |
David S. Miller | 667f0ce | 2010-04-21 03:08:11 -0700 | [diff] [blame] | 29 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 30 | t = tp->task; |
| 31 | #endif |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 32 | do { |
David S. Miller | 14d2c68 | 2008-05-21 18:15:53 -0700 | [diff] [blame] | 33 | struct sparc_stackf *sf; |
David S. Miller | 77c664f | 2008-04-24 03:28:52 -0700 | [diff] [blame] | 34 | struct pt_regs *regs; |
| 35 | unsigned long pc; |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 36 | |
David S. Miller | 4f70f7a | 2008-08-12 18:33:56 -0700 | [diff] [blame] | 37 | if (!kstack_valid(tp, fp)) |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 38 | break; |
| 39 | |
David S. Miller | 14d2c68 | 2008-05-21 18:15:53 -0700 | [diff] [blame] | 40 | sf = (struct sparc_stackf *) fp; |
| 41 | regs = (struct pt_regs *) (sf + 1); |
David S. Miller | 77c664f | 2008-04-24 03:28:52 -0700 | [diff] [blame] | 42 | |
David S. Miller | 4f70f7a | 2008-08-12 18:33:56 -0700 | [diff] [blame] | 43 | if (kstack_is_trap_frame(tp, regs)) { |
David S. Miller | 14d2c68 | 2008-05-21 18:15:53 -0700 | [diff] [blame] | 44 | if (!(regs->tstate & TSTATE_PRIV)) |
| 45 | break; |
David S. Miller | 77c664f | 2008-04-24 03:28:52 -0700 | [diff] [blame] | 46 | pc = regs->tpc; |
| 47 | fp = regs->u_regs[UREG_I6] + STACK_BIAS; |
| 48 | } else { |
David S. Miller | 14d2c68 | 2008-05-21 18:15:53 -0700 | [diff] [blame] | 49 | pc = sf->callers_pc; |
| 50 | fp = (unsigned long)sf->fp + STACK_BIAS; |
David S. Miller | 77c664f | 2008-04-24 03:28:52 -0700 | [diff] [blame] | 51 | } |
| 52 | |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 53 | if (trace->skip > 0) |
| 54 | trace->skip--; |
David S. Miller | 667f0ce | 2010-04-21 03:08:11 -0700 | [diff] [blame] | 55 | else if (!skip_sched || !in_sched_functions(pc)) { |
David S. Miller | 77c664f | 2008-04-24 03:28:52 -0700 | [diff] [blame] | 56 | trace->entries[trace->nr_entries++] = pc; |
David S. Miller | 667f0ce | 2010-04-21 03:08:11 -0700 | [diff] [blame] | 57 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 58 | if ((pc + 8UL) == (unsigned long) &return_to_handler) { |
| 59 | int index = t->curr_ret_stack; |
| 60 | if (t->ret_stack && index >= graph) { |
| 61 | pc = t->ret_stack[index - graph].ret; |
| 62 | if (trace->nr_entries < |
| 63 | trace->max_entries) |
| 64 | trace->entries[trace->nr_entries++] = pc; |
| 65 | graph++; |
| 66 | } |
| 67 | } |
| 68 | #endif |
| 69 | } |
David S. Miller | 10e2672 | 2006-11-16 13:38:57 -0800 | [diff] [blame] | 70 | } while (trace->nr_entries < trace->max_entries); |
| 71 | } |
David S. Miller | 6a5726d | 2008-11-28 01:19:41 -0800 | [diff] [blame] | 72 | |
| 73 | void save_stack_trace(struct stack_trace *trace) |
| 74 | { |
| 75 | __save_stack_trace(current_thread_info(), trace, false); |
| 76 | } |
Ingo Molnar | 7b4c950 | 2008-07-03 09:17:55 +0200 | [diff] [blame] | 77 | EXPORT_SYMBOL_GPL(save_stack_trace); |
David S. Miller | 6a5726d | 2008-11-28 01:19:41 -0800 | [diff] [blame] | 78 | |
| 79 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) |
| 80 | { |
| 81 | struct thread_info *tp = task_thread_info(tsk); |
| 82 | |
| 83 | __save_stack_trace(tp, trace, true); |
| 84 | } |
| 85 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |