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