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Linux/arch/s390/oprofile/backtrace.c

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  1 /*
  2  * S390 Version
  3  *   Copyright IBM Corp. 2005
  4  *   Author(s): Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
  5  */
  6 
  7 #include <linux/oprofile.h>
  8 
  9 #include <asm/processor.h> /* for struct stack_frame */
 10 
 11 static unsigned long
 12 __show_trace(unsigned int *depth, unsigned long sp,
 13              unsigned long low, unsigned long high)
 14 {
 15         struct stack_frame *sf;
 16         struct pt_regs *regs;
 17 
 18         while (*depth) {
 19                 sp = sp & PSW_ADDR_INSN;
 20                 if (sp < low || sp > high - sizeof(*sf))
 21                         return sp;
 22                 sf = (struct stack_frame *) sp;
 23                 (*depth)--;
 24                 oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
 25 
 26                 /* Follow the backchain.  */
 27                 while (*depth) {
 28                         low = sp;
 29                         sp = sf->back_chain & PSW_ADDR_INSN;
 30                         if (!sp)
 31                                 break;
 32                         if (sp <= low || sp > high - sizeof(*sf))
 33                                 return sp;
 34                         sf = (struct stack_frame *) sp;
 35                         (*depth)--;
 36                         oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
 37 
 38                 }
 39 
 40                 if (*depth == 0)
 41                         break;
 42 
 43                 /* Zero backchain detected, check for interrupt frame.  */
 44                 sp = (unsigned long) (sf + 1);
 45                 if (sp <= low || sp > high - sizeof(*regs))
 46                         return sp;
 47                 regs = (struct pt_regs *) sp;
 48                 (*depth)--;
 49                 oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
 50                 low = sp;
 51                 sp = regs->gprs[15];
 52         }
 53         return sp;
 54 }
 55 
 56 void s390_backtrace(struct pt_regs * const regs, unsigned int depth)
 57 {
 58         unsigned long head;
 59         struct stack_frame* head_sf;
 60 
 61         if (user_mode(regs))
 62                 return;
 63 
 64         head = regs->gprs[15];
 65         head_sf = (struct stack_frame*)head;
 66 
 67         if (!head_sf->back_chain)
 68                 return;
 69 
 70         head = head_sf->back_chain;
 71 
 72         head = __show_trace(&depth, head, S390_lowcore.async_stack - ASYNC_SIZE,
 73                             S390_lowcore.async_stack);
 74 
 75         __show_trace(&depth, head, S390_lowcore.thread_info,
 76                      S390_lowcore.thread_info + THREAD_SIZE);
 77 }
 78 

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