forked from Minki/linux
80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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/**
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* arch/s390/oprofile/backtrace.c
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*
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* S390 Version
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* Copyright (C) 2005 IBM Corporation, IBM Deutschland Entwicklung GmbH.
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* Author(s): Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
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*/
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#include <linux/oprofile.h>
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#include <asm/processor.h> /* for struct stack_frame */
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static unsigned long
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__show_trace(unsigned int *depth, unsigned long sp,
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unsigned long low, unsigned long high)
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{
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struct stack_frame *sf;
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struct pt_regs *regs;
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while (*depth) {
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sp = sp & PSW_ADDR_INSN;
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if (sp < low || sp > high - sizeof(*sf))
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return sp;
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sf = (struct stack_frame *) sp;
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(*depth)--;
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oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
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/* Follow the backchain. */
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while (*depth) {
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low = sp;
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sp = sf->back_chain & PSW_ADDR_INSN;
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if (!sp)
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break;
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if (sp <= low || sp > high - sizeof(*sf))
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return sp;
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sf = (struct stack_frame *) sp;
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(*depth)--;
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oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
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}
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if (*depth == 0)
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break;
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/* Zero backchain detected, check for interrupt frame. */
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sp = (unsigned long) (sf + 1);
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if (sp <= low || sp > high - sizeof(*regs))
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return sp;
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regs = (struct pt_regs *) sp;
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(*depth)--;
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oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
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low = sp;
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sp = regs->gprs[15];
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}
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return sp;
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}
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void s390_backtrace(struct pt_regs * const regs, unsigned int depth)
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{
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unsigned long head;
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struct stack_frame* head_sf;
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if (user_mode (regs))
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return;
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head = regs->gprs[15];
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head_sf = (struct stack_frame*)head;
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if (!head_sf->back_chain)
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return;
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head = head_sf->back_chain;
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head = __show_trace(&depth, head, S390_lowcore.async_stack - ASYNC_SIZE,
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S390_lowcore.async_stack);
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__show_trace(&depth, head, S390_lowcore.thread_info,
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S390_lowcore.thread_info + THREAD_SIZE);
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}
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