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Linux/arch/sparc/kernel/stacktrace.c

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  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);
 86 

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