tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ARC: Make arc_unwind_core accessible externally
The arc unwinder can also be used for perf callchains.
Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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arch/arc/include/asm/stacktrace.h
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arch/arc/include/asm/stacktrace.h
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/*
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* Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
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* Copyright (C) 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_STACKTRACE_H
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#define __ASM_STACKTRACE_H
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#include <linux/sched.h>
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/**
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* arc_unwind_core - Unwind the kernel mode stack for an execution context
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* @tsk: NULL for current task, specific task otherwise
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* @regs: pt_regs used to seed the unwinder {SP, FP, BLINK, PC}
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* If NULL, use pt_regs of @tsk (if !NULL) otherwise
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* use the current values of {SP, FP, BLINK, PC}
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* @consumer_fn: Callback invoked for each frame unwound
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* Returns 0 to continue unwinding, -1 to stop
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* @arg: Arg to callback
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*
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* Returns the address of first function in stack
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*
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* Semantics:
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* - synchronous unwinding (e.g. dump_stack): @tsk NULL, @regs NULL
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* - Asynchronous unwinding of sleeping task: @tsk !NULL, @regs NULL
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* - Asynchronous unwinding of intr/excp etc: @tsk !NULL, @regs !NULL
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*/
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notrace noinline unsigned int arc_unwind_core(
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struct task_struct *tsk, struct pt_regs *regs,
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int (*consumer_fn) (unsigned int, void *),
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void *arg);
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#endif /* __ASM_STACKTRACE_H */
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arch/arc/kernel/stacktrace.c
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arch/arc/kernel/stacktrace.c
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struct pt_regs *regs,
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struct unwind_frame_info *frame_info)
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{
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/*
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* synchronous unwinding (e.g. dump_stack)
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* - uses current values of SP and friends
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*/
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if (tsk == NULL && regs == NULL) {
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unsigned long fp, sp, blink, ret;
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frame_info->task = current;
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frame_info->regs.r63 = ret;
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frame_info->call_frame = 0;
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} else if (regs == NULL) {
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/*
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* Asynchronous unwinding of sleeping task
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* - Gets SP etc from task's pt_regs (saved bottom of kernel
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* mode stack of task)
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*/
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frame_info->task = tsk;
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···
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frame_info->call_frame = 0;
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} else {
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/*
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* Asynchronous unwinding of intr/exception
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* - Just uses the pt_regs passed
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*/
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frame_info->task = tsk;
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frame_info->regs.r27 = regs->fp;
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#endif
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static noinline unsigned int
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notrace noinline unsigned int
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arc_unwind_core(struct task_struct *tsk, struct pt_regs *regs,
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int (*consumer_fn) (unsigned int, void *), void *arg)
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{