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
  17 static int __s390_backtrace(void *data, unsigned long address, int reliable)
  18 {
  19         unsigned int *depth = data;
  20
  21         if (*depth == 0)
  22                 return 1;
  23         (*depth)--;
  24         oprofile_add_trace(address);
  25         return 0;
  26 }
  27
  28 static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
  29 {
  30         if (user_mode(regs))
  31                 return;
  32         dump_trace(__s390_backtrace, &depth, NULL, regs->gprs[15]);
  33 }
  34
  35 int __init oprofile_arch_init(struct oprofile_operations *ops)
  36 {
  37         ops->backtrace = s390_backtrace;
  38         return 0;
  39 }
  40
  41 void oprofile_arch_exit(void)
  42 {
  43 }