projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 10e26723 DM |
1 | #include <linux/sched.h> |
| 2 | #include <linux/stacktrace.h> | |
| 3 | #include <linux/thread_info.h> | |
| 667f0cee | 4 | #include <linux/ftrace.h> |
| a05fe038 | 5 | #include <linux/module.h> |
| 10e26723 | 6 | #include <asm/ptrace.h> |
| 85a79353 | 7 | #include <asm/stacktrace.h> |
| 10e26723 | 8 | |
| 4f70f7a9 DM |
9 | #include "kstack.h" |
| 10 | ||
| 6a5726dd DM |
11 | static void __save_stack_trace(struct thread_info *tp, |
| 12 | struct stack_trace *trace, | |
| 13 | bool skip_sched) | |
| 10e26723 | 14 | { |
| 6f63e781 | 15 | unsigned long ksp, fp; |
| 667f0cee DM |
16 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 17 | struct task_struct *t; | |
| 18 | int graph = 0; | |
| 19 | #endif | |
| 10e26723 | 20 | |
| 6a5726dd DM |
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 | } | |
| 10e26723 DM |
27 | |
| 28 | fp = ksp + STACK_BIAS; | |
| 667f0cee DM |
29 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 30 | t = tp->task; | |
| 31 | #endif | |
| 10e26723 | 32 | do { |
| 14d2c68b | 33 | struct sparc_stackf *sf; |
| 77c664fa DM |
34 | struct pt_regs *regs; |
| 35 | unsigned long pc; | |
| 10e26723 | 36 | |
| 4f70f7a9 | 37 | if (!kstack_valid(tp, fp)) |
| 10e26723 DM |
38 | break; |
| 39 | ||
| 14d2c68b DM |
40 | sf = (struct sparc_stackf *) fp; |
| 41 | regs = (struct pt_regs *) (sf + 1); | |
| 77c664fa | 42 | |
| 4f70f7a9 | 43 | if (kstack_is_trap_frame(tp, regs)) { |
| 14d2c68b DM |
44 | if (!(regs->tstate & TSTATE_PRIV)) |
| 45 | break; | |
| 77c664fa DM |
46 | pc = regs->tpc; |
| 47 | fp = regs->u_regs[UREG_I6] + STACK_BIAS; | |
| 48 | } else { | |
| 14d2c68b DM |
49 | pc = sf->callers_pc; |
| 50 | fp = (unsigned long)sf->fp + STACK_BIAS; | |
| 77c664fa DM |
51 | } |
| 52 | ||
| 10e26723 DM |
53 | if (trace->skip > 0) |
| 54 | trace->skip--; | |
| 667f0cee | 55 | else if (!skip_sched || !in_sched_functions(pc)) { |
| 77c664fa | 56 | trace->entries[trace->nr_entries++] = pc; |
| 667f0cee DM |
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 | } | |
| 10e26723 DM |
70 | } while (trace->nr_entries < trace->max_entries); |
| 71 | } | |
| 6a5726dd DM |
72 | |
| 73 | void save_stack_trace(struct stack_trace *trace) | |
| 74 | { | |
| 75 | __save_stack_trace(current_thread_info(), trace, false); | |
| 76 | } | |
| 7b4c9505 | 77 | EXPORT_SYMBOL_GPL(save_stack_trace); |
| 6a5726dd DM |
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); |