c736533075
Currently, when unwinding the call stack, we validate the frame pointer of each frame against frame.sp, whose value is not clearly defined, and which makes it more difficult to link stack frames together across different stacks. It is far better to simply check whether the frame pointer itself points into a valid stack. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Will Deacon <will.deacon@arm.com>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
#ifndef __ASM_IRQ_H
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#define __ASM_IRQ_H
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#define IRQ_STACK_SIZE THREAD_SIZE
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#define IRQ_STACK_START_SP THREAD_START_SP
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#ifndef __ASSEMBLER__
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#include <linux/percpu.h>
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#include <linux/sched/task_stack.h>
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#include <asm-generic/irq.h>
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#include <asm/thread_info.h>
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struct pt_regs;
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DECLARE_PER_CPU(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack);
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/*
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* The highest address on the stack, and the first to be used. Used to
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* find the dummy-stack frame put down by el?_irq() in entry.S, which
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* is structured as follows:
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*
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* ------------
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* | | <- irq_stack_ptr
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* top ------------
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* | x19 | <- irq_stack_ptr - 0x08
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* ------------
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* | x29 | <- irq_stack_ptr - 0x10
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* ------------
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*
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* where x19 holds a copy of the task stack pointer where the struct pt_regs
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* from kernel_entry can be found.
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*
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*/
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#define IRQ_STACK_PTR() ((unsigned long)raw_cpu_ptr(irq_stack) + IRQ_STACK_START_SP)
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/*
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* The offset from irq_stack_ptr where entry.S will store the original
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* stack pointer. Used by unwind_frame() and dump_backtrace().
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*/
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#define IRQ_STACK_TO_TASK_STACK(ptr) (*((unsigned long *)((ptr) - 0x08)))
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extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
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static inline int nr_legacy_irqs(void)
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{
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return 0;
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}
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static inline bool on_irq_stack(unsigned long sp)
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{
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unsigned long low = (unsigned long)raw_cpu_ptr(irq_stack);
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unsigned long high = low + IRQ_STACK_START_SP;
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return (low <= sp && sp <= high);
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}
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static inline bool on_task_stack(struct task_struct *tsk, unsigned long sp)
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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 (low <= sp && sp < high);
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}
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#endif /* !__ASSEMBLER__ */
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#endif
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