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d1f684e46b
In subsequent patches we'll want to acquire the stack boundaries ahead-of-time, and we'll need to be able to acquire the relevant stack_info regardless of whether we have an object the happens to be on the stack. This patch replaces the on_XXX_stack() helpers with stackinfo_get_XXX() helpers, with the caller being responsible for the checking whether an object is on a relevant stack. For the moment this is moved into the on_accessible_stack() functions, making these slightly larger; subsequent patches will remove the on_accessible_stack() functions and simplify the logic. The on_irq_stack() and on_task_stack() helpers are kept as these are used by IRQ entry sequences and stackleak respectively. As they're only used as predicates, the stack_info pointer parameter is removed in both cases. As the on_accessible_stack() functions are always passed a non-NULL info pointer, these now update info unconditionally. When updating the type to STACK_TYPE_UNKNOWN, the low/high bounds are also modified, but as these will not be consumed this should have no adverse affect. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Kalesh Singh <kaleshsingh@google.com> Reviewed-by: Madhavan T. Venkataraman <madvenka@linux.microsoft.com> Reviewed-by: Mark Brown <broonie@kernel.org> Cc: Fuad Tabba <tabba@google.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20220901130646.1316937-7-mark.rutland@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
113 lines
2.8 KiB
C
113 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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.type = STACK_TYPE_IRQ,
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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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.type = STACK_TYPE_TASK,
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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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#ifdef CONFIG_VMAP_STACK
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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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.type = STACK_TYPE_OVERFLOW,
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};
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}
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#else
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#define stackinfo_get_overflow() stackinfo_get_unknown()
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#endif
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#if defined(CONFIG_ARM_SDE_INTERFACE) && defined(CONFIG_VMAP_STACK)
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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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.type = STACK_TYPE_SDEI_NORMAL,
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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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.type = STACK_TYPE_SDEI_CRITICAL,
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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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#endif /* __ASM_STACKTRACE_H */
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