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 void callchain_address(void *data, unsigned long addr, int reliable)
  15 {
  16         struct perf_callchain_entry_ctx *entry = data;
  17
  18         if (reliable)
  19                 perf_callchain_store(entry, addr);
  20 }
  21
  22 static const struct stacktrace_ops callchain_ops = {
  23         .address        = callchain_address,
  24 };
  25
  26 void
  27 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
  28 {
  29         perf_callchain_store(entry, regs->pc);
  30
  31         unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
  32 }