arch/sh/kernel/perf_callchain.c

   1 /*
   2  * Performance event callchain support - SuperH architecture code
   3  *
   4  * Copyright (C) 2009  Paul Mundt
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/perf_event.h>
  13 #include <linux/percpu.h>
  14 #include <asm/unwinder.h>
  15 #include <asm/ptrace.h>
  16
  17 static int callchain_stack(void *data, char *name)
  18 {
  19         return 0;
  20 }
  21
  22 static void callchain_address(void *data, unsigned long addr, int reliable)
  23 {
  24         struct perf_callchain_entry_ctx *entry = data;
  25
  26         if (reliable)
  27                 perf_callchain_store(entry, addr);
  28 }
  29
  30 static const struct stacktrace_ops callchain_ops = {
  31         .stack          = callchain_stack,
  32         .address        = callchain_address,
  33 };
  34
  35 void
  36 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
  37 {
  38         perf_callchain_store(entry, regs->pc);
  39
  40         unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
  41 }