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arm64: stacktrace: Add shared header for common stack unwinding code
In order to reuse the arm64 stack unwinding logic for the nVHE hypervisor stack, move the common code to a shared header (arch/arm64/include/asm/stacktrace/common.h). The nVHE hypervisor cannot safely link against kernel code, so we make use of the shared header to avoid duplicated logic later in this series. Signed-off-by: Kalesh Singh <kaleshsingh@google.com> Reviewed-by: Mark Brown <broonie@kernel.org> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220726073750.3219117-2-kaleshsingh@google.com
This commit is contained in:
Kalesh Singh
Marc Zyngier
parent
82a592c13b
commit
6bf212c89c
@ -8,52 +8,19 @@
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#include <linux/percpu.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <linux/types.h>
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#include <linux/llist.h>
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#include <asm/memory.h>
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#include <asm/ptrace.h>
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#include <asm/sdei.h>
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enum stack_type {
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STACK_TYPE_UNKNOWN,
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STACK_TYPE_TASK,
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STACK_TYPE_IRQ,
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STACK_TYPE_OVERFLOW,
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STACK_TYPE_SDEI_NORMAL,
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STACK_TYPE_SDEI_CRITICAL,
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__NR_STACK_TYPES
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};
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struct stack_info {
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unsigned long low;
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unsigned long high;
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enum stack_type type;
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};
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#include <asm/stacktrace/common.h>
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extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
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const char *loglvl);
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DECLARE_PER_CPU(unsigned long *, irq_stack_ptr);
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static inline bool on_stack(unsigned long sp, unsigned long size,
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unsigned long low, unsigned long high,
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enum stack_type type, struct stack_info *info)
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{
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if (!low)
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return false;
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if (sp < low || sp + size < sp || sp + size > high)
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return false;
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if (info) {
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info->low = low;
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info->high = high;
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info->type = type;
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}
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return true;
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}
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static inline bool on_irq_stack(unsigned long sp, unsigned long size,
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struct stack_info *info)
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{
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105
arch/arm64/include/asm/stacktrace/common.h
Normal file
105
arch/arm64/include/asm/stacktrace/common.h
Normal file
@ -0,0 +1,105 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Common arm64 stack unwinder code.
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*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_STACKTRACE_COMMON_H
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#define __ASM_STACKTRACE_COMMON_H
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#include <linux/bitmap.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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enum stack_type {
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STACK_TYPE_UNKNOWN,
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STACK_TYPE_TASK,
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STACK_TYPE_IRQ,
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STACK_TYPE_OVERFLOW,
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STACK_TYPE_SDEI_NORMAL,
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STACK_TYPE_SDEI_CRITICAL,
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__NR_STACK_TYPES
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};
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struct stack_info {
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unsigned long low;
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unsigned long high;
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enum stack_type type;
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};
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/*
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* A snapshot of a frame record or fp/lr register values, along with some
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* accounting information necessary for robust unwinding.
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*
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* @fp: The fp value in the frame record (or the real fp)
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* @pc: The lr value in the frame record (or the real lr)
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*
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* @stacks_done: Stacks which have been entirely unwound, for which it is no
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* longer valid to unwind to.
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*
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* @prev_fp: The fp that pointed to this frame record, or a synthetic value
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* of 0. This is used to ensure that within a stack, each
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* subsequent frame record is at an increasing address.
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* @prev_type: The type of stack this frame record was on, or a synthetic
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* value of STACK_TYPE_UNKNOWN. This is used to detect a
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* transition from one stack to another.
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*
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* @kr_cur: When KRETPROBES is selected, holds the kretprobe instance
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* associated with the most recently encountered replacement lr
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* value.
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*
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* @task: The task being unwound.
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*/
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struct unwind_state {
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unsigned long fp;
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unsigned long pc;
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DECLARE_BITMAP(stacks_done, __NR_STACK_TYPES);
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unsigned long prev_fp;
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enum stack_type prev_type;
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#ifdef CONFIG_KRETPROBES
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struct llist_node *kr_cur;
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#endif
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struct task_struct *task;
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};
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static inline bool on_stack(unsigned long sp, unsigned long size,
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unsigned long low, unsigned long high,
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enum stack_type type, struct stack_info *info)
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{
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if (!low)
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return false;
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if (sp < low || sp + size < sp || sp + size > high)
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return false;
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if (info) {
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info->low = low;
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info->high = high;
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info->type = type;
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}
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return true;
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}
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static inline void unwind_init_common(struct unwind_state *state,
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struct task_struct *task)
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{
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state->task = task;
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#ifdef CONFIG_KRETPROBES
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state->kr_cur = NULL;
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#endif
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/*
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* Prime the first unwind.
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*
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* In unwind_next() we'll check that the FP points to a valid stack,
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* which can't be STACK_TYPE_UNKNOWN, and the first unwind will be
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* treated as a transition to whichever stack that happens to be. The
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* prev_fp value won't be used, but we set it to 0 such that it is
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* definitely not an accessible stack address.
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*/
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bitmap_zero(state->stacks_done, __NR_STACK_TYPES);
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state->prev_fp = 0;
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state->prev_type = STACK_TYPE_UNKNOWN;
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}
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#endif /* __ASM_STACKTRACE_COMMON_H */
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@ -18,63 +18,6 @@
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#include <asm/stack_pointer.h>
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#include <asm/stacktrace.h>
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/*
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* A snapshot of a frame record or fp/lr register values, along with some
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* accounting information necessary for robust unwinding.
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*
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* @fp: The fp value in the frame record (or the real fp)
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* @pc: The lr value in the frame record (or the real lr)
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*
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* @stacks_done: Stacks which have been entirely unwound, for which it is no
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* longer valid to unwind to.
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*
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* @prev_fp: The fp that pointed to this frame record, or a synthetic value
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* of 0. This is used to ensure that within a stack, each
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* subsequent frame record is at an increasing address.
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* @prev_type: The type of stack this frame record was on, or a synthetic
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* value of STACK_TYPE_UNKNOWN. This is used to detect a
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* transition from one stack to another.
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*
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* @kr_cur: When KRETPROBES is selected, holds the kretprobe instance
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* associated with the most recently encountered replacement lr
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* value.
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*
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* @task: The task being unwound.
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*/
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struct unwind_state {
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unsigned long fp;
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unsigned long pc;
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DECLARE_BITMAP(stacks_done, __NR_STACK_TYPES);
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unsigned long prev_fp;
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enum stack_type prev_type;
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#ifdef CONFIG_KRETPROBES
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struct llist_node *kr_cur;
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#endif
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struct task_struct *task;
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};
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static void unwind_init_common(struct unwind_state *state,
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struct task_struct *task)
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{
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state->task = task;
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#ifdef CONFIG_KRETPROBES
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state->kr_cur = NULL;
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#endif
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/*
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* Prime the first unwind.
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*
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* In unwind_next() we'll check that the FP points to a valid stack,
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* which can't be STACK_TYPE_UNKNOWN, and the first unwind will be
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* treated as a transition to whichever stack that happens to be. The
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* prev_fp value won't be used, but we set it to 0 such that it is
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* definitely not an accessible stack address.
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*/
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bitmap_zero(state->stacks_done, __NR_STACK_TYPES);
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state->prev_fp = 0;
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state->prev_type = STACK_TYPE_UNKNOWN;
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}
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/*
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* Start an unwind from a pt_regs.
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*
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