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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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907cb5cd8e
With VMAP_STACK now always enabled on arm64, remove all CONFIG_VMAP_STACK conditionals from overflow stack handling in stacktrace code. This change unconditionally defines the per-CPU overflow_stack and stackinfo_get_overflow() helper in arch/arm64/include/asm/stacktrace.h, and always includes the overflow stack in the stack_info array in arch/arm64/kernel/stacktrace.c. Also, drop redundant CONFIG_VMAP_STACK checks from SDEI stack declarations. Signed-off-by: Breno Leitao <leitao@debian.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20250707-arm64_vmap-v1-6-8de98ca0f91c@debian.org Signed-off-by: Will Deacon <will@kernel.org>
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Ltd.
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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/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/llist.h>
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#include <asm/memory.h>
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#include <asm/pointer_auth.h>
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#include <asm/ptrace.h>
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#include <asm/sdei.h>
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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 struct stack_info stackinfo_get_irq(void)
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{
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unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);
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unsigned long high = low + IRQ_STACK_SIZE;
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return (struct stack_info) {
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.low = low,
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.high = high,
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};
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}
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static inline bool on_irq_stack(unsigned long sp, unsigned long size)
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{
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struct stack_info info = stackinfo_get_irq();
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return stackinfo_on_stack(&info, sp, size);
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}
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static inline struct stack_info stackinfo_get_task(const struct task_struct *tsk)
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{
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unsigned long low = (unsigned long)task_stack_page(tsk);
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unsigned long high = low + THREAD_SIZE;
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return (struct stack_info) {
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.low = low,
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.high = high,
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};
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}
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static inline bool on_task_stack(const struct task_struct *tsk,
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unsigned long sp, unsigned long size)
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{
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struct stack_info info = stackinfo_get_task(tsk);
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return stackinfo_on_stack(&info, sp, size);
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}
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#define on_thread_stack() (on_task_stack(current, current_stack_pointer, 1))
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DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
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static inline struct stack_info stackinfo_get_overflow(void)
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{
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unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
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unsigned long high = low + OVERFLOW_STACK_SIZE;
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return (struct stack_info) {
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.low = low,
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.high = high,
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};
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}
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#if defined(CONFIG_ARM_SDE_INTERFACE)
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DECLARE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
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DECLARE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
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static inline struct stack_info stackinfo_get_sdei_normal(void)
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{
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unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
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unsigned long high = low + SDEI_STACK_SIZE;
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return (struct stack_info) {
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.low = low,
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.high = high,
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};
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}
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static inline struct stack_info stackinfo_get_sdei_critical(void)
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{
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unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr);
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unsigned long high = low + SDEI_STACK_SIZE;
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return (struct stack_info) {
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.low = low,
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.high = high,
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};
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}
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#else
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#define stackinfo_get_sdei_normal() stackinfo_get_unknown()
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#define stackinfo_get_sdei_critical() stackinfo_get_unknown()
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#endif
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#ifdef CONFIG_EFI
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extern u64 *efi_rt_stack_top;
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static inline struct stack_info stackinfo_get_efi(void)
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{
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unsigned long high = (u64)efi_rt_stack_top;
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unsigned long low = high - THREAD_SIZE;
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return (struct stack_info) {
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.low = low,
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.high = high,
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};
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}
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#endif
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#endif /* __ASM_STACKTRACE_H */
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