arch/s390/oprofile/init.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * S390 Version
   4  *   Copyright IBM Corp. 2002, 2011
   5  *   Author(s): Thomas Spatzier (tspat@de.ibm.com)
   6  *   Author(s): Mahesh Salgaonkar (mahesh@linux.vnet.ibm.com)
   7  *   Author(s): Heinz Graalfs (graalfs@linux.vnet.ibm.com)
   8  *   Author(s): Andreas Krebbel (krebbel@linux.vnet.ibm.com)
   9  *
  10  * @remark Copyright 2002-2011 OProfile authors
  11  */
  12
  13 #include <linux/oprofile.h>
  14 #include <linux/init.h>
  15 #include <asm/processor.h>
  16 #include <asm/unwind.h>
  17
  18 static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
  19 {
  20         struct unwind_state state;
  21
  22         unwind_for_each_frame(&state, current, regs, 0) {
  23                 if (depth-- == 0)
  24                         break;
  25                 oprofile_add_trace(state.ip);
  26         }
  27 }
  28
  29 int __init oprofile_arch_init(struct oprofile_operations *ops)
  30 {
  31         ops->backtrace = s390_backtrace;
  32         return 0;
  33 }
  34
  35 void oprofile_arch_exit(void)
  36 {
  37 }