arch/sh/kernel/perf_callchain.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Performance event callchain support - SuperH architecture code
   4  *
   5  * Copyright (C) 2009  Paul Mundt
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/sched.h>
   9 #include <linux/perf_event.h>
  10 #include <linux/percpu.h>
  11 #include <asm/unwinder.h>
  12 #include <asm/ptrace.h>
  13
  14 static int callchain_stack(void *data, char *name)
  15 {
  16         return 0;
  17 }
  18
  19 static void callchain_address(void *data, unsigned long addr, int reliable)
  20 {
  21         struct perf_callchain_entry_ctx *entry = data;
  22
  23         if (reliable)
  24                 perf_callchain_store(entry, addr);
  25 }
  26
  27 static const struct stacktrace_ops callchain_ops = {
  28         .stack          = callchain_stack,
  29         .address        = callchain_address,
  30 };
  31
  32 void
  33 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
  34 {
  35         perf_callchain_store(entry, regs->pc);
  36
  37         unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
  38 }