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78c98f9074
Rework the dump_trace() stack unwinder interface to support different unwinding algorithms. The new interface looks like this: struct unwind_state state; unwind_for_each_frame(&state, task, regs, start_stack) do_something(state.sp, state.ip, state.reliable); The unwind_bc.c file contains the implementation for the classic back-chain unwinder. One positive side effect of the new code is it now handles ftraced functions gracefully. It prints the real name of the return function instead of 'return_to_handler'. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
37 lines
850 B
C
37 lines
850 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* S390 Version
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* Copyright IBM Corp. 2002, 2011
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* Author(s): Thomas Spatzier (tspat@de.ibm.com)
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* Author(s): Mahesh Salgaonkar (mahesh@linux.vnet.ibm.com)
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* Author(s): Heinz Graalfs (graalfs@linux.vnet.ibm.com)
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* Author(s): Andreas Krebbel (krebbel@linux.vnet.ibm.com)
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*
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* @remark Copyright 2002-2011 OProfile authors
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*/
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#include <linux/oprofile.h>
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#include <linux/init.h>
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#include <asm/processor.h>
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#include <asm/unwind.h>
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static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
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{
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struct unwind_state state;
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unwind_for_each_frame(&state, current, regs, 0) {
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if (depth-- == 0)
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break;
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oprofile_add_trace(state.ip);
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}
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}
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int __init oprofile_arch_init(struct oprofile_operations *ops)
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{
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ops->backtrace = s390_backtrace;
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return 0;
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}
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void oprofile_arch_exit(void)
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{
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}
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