arch/s390/oprofile/init.c

   1 /*
   2  * S390 Version
   3  *   Copyright IBM Corp. 2002, 2011
   4  *   Author(s): Thomas Spatzier (tspat@de.ibm.com)
   5  *   Author(s): Mahesh Salgaonkar (mahesh@linux.vnet.ibm.com)
   6  *   Author(s): Heinz Graalfs (graalfs@linux.vnet.ibm.com)
   7  *   Author(s): Andreas Krebbel (krebbel@linux.vnet.ibm.com)
   8  *
   9  * @remark Copyright 2002-2011 OProfile authors
  10  */
  11
  12 #include <linux/oprofile.h>
  13 #include <linux/init.h>
  14 #include <asm/processor.h>
  15
  16 static int __s390_backtrace(void *data, unsigned long address)
  17 {
  18         unsigned int *depth = data;
  19
  20         if (*depth == 0)
  21                 return 1;
  22         (*depth)--;
  23         oprofile_add_trace(address);
  24         return 0;
  25 }
  26
  27 static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
  28 {
  29         if (user_mode(regs))
  30                 return;
  31         dump_trace(__s390_backtrace, &depth, NULL, regs->gprs[15]);
  32 }
  33
  34 int __init oprofile_arch_init(struct oprofile_operations *ops)
  35 {
  36         ops->backtrace = s390_backtrace;
  37         return 0;
  38 }
  39
  40 void oprofile_arch_exit(void)
  41 {
  42 }