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10e26723 DM |
1 | #include <linux/sched.h> |
2 | #include <linux/stacktrace.h> | |
3 | #include <linux/thread_info.h> | |
a05fe038 | 4 | #include <linux/module.h> |
10e26723 | 5 | #include <asm/ptrace.h> |
85a79353 | 6 | #include <asm/stacktrace.h> |
10e26723 | 7 | |
4f70f7a9 DM |
8 | #include "kstack.h" |
9 | ||
6a5726dd DM |
10 | static void __save_stack_trace(struct thread_info *tp, |
11 | struct stack_trace *trace, | |
12 | bool skip_sched) | |
10e26723 | 13 | { |
6f63e781 | 14 | unsigned long ksp, fp; |
10e26723 | 15 | |
6a5726dd DM |
16 | if (tp == current_thread_info()) { |
17 | stack_trace_flush(); | |
18 | __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp)); | |
19 | } else { | |
20 | ksp = tp->ksp; | |
21 | } | |
10e26723 DM |
22 | |
23 | fp = ksp + STACK_BIAS; | |
10e26723 | 24 | do { |
14d2c68b | 25 | struct sparc_stackf *sf; |
77c664fa DM |
26 | struct pt_regs *regs; |
27 | unsigned long pc; | |
10e26723 | 28 | |
4f70f7a9 | 29 | if (!kstack_valid(tp, fp)) |
10e26723 DM |
30 | break; |
31 | ||
14d2c68b DM |
32 | sf = (struct sparc_stackf *) fp; |
33 | regs = (struct pt_regs *) (sf + 1); | |
77c664fa | 34 | |
4f70f7a9 | 35 | if (kstack_is_trap_frame(tp, regs)) { |
14d2c68b DM |
36 | if (!(regs->tstate & TSTATE_PRIV)) |
37 | break; | |
77c664fa DM |
38 | pc = regs->tpc; |
39 | fp = regs->u_regs[UREG_I6] + STACK_BIAS; | |
40 | } else { | |
14d2c68b DM |
41 | pc = sf->callers_pc; |
42 | fp = (unsigned long)sf->fp + STACK_BIAS; | |
77c664fa DM |
43 | } |
44 | ||
10e26723 DM |
45 | if (trace->skip > 0) |
46 | trace->skip--; | |
6a5726dd | 47 | else if (!skip_sched || !in_sched_functions(pc)) |
77c664fa | 48 | trace->entries[trace->nr_entries++] = pc; |
10e26723 DM |
49 | } while (trace->nr_entries < trace->max_entries); |
50 | } | |
6a5726dd DM |
51 | |
52 | void save_stack_trace(struct stack_trace *trace) | |
53 | { | |
54 | __save_stack_trace(current_thread_info(), trace, false); | |
55 | } | |
7b4c9505 | 56 | EXPORT_SYMBOL_GPL(save_stack_trace); |
6a5726dd DM |
57 | |
58 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) | |
59 | { | |
60 | struct thread_info *tp = task_thread_info(tsk); | |
61 | ||
62 | __save_stack_trace(tp, trace, true); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |