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linux-next/arch/x86/include/asm/irq.h
Thomas Gleixner f0178fc01f x86/entry: Unbreak __irqentry_text_start/end magic
The entry rework moved interrupt entry code from the irqentry to the
noinstr section which made the irqentry section empty.

This breaks boundary checks which rely on the __irqentry_text_start/end
markers to find out whether a function in a stack trace is
interrupt/exception entry code. This affects the function graph tracer and
filter_irq_stacks().

As the IDT entry points are all sequentialy emitted this is rather simple
to unbreak by injecting __irqentry_text_start/end as global labels.

To make this work correctly:

  - Remove the IRQENTRY_TEXT section from the x86 linker script
  - Define __irqentry so it breaks the build if it's used
  - Adjust the entry mirroring in PTI
  - Remove the redundant kprobes and unwinder bound checks

Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2020-06-11 15:15:29 +02:00

57 lines
1.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_IRQ_H
#define _ASM_X86_IRQ_H
/*
* (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
*
* IRQ/IPI changes taken from work by Thomas Radke
* <tomsoft@informatik.tu-chemnitz.de>
*/
#include <asm/apicdef.h>
#include <asm/irq_vectors.h>
/*
* The irq entry code is in the noinstr section and the start/end of
* __irqentry_text is emitted via labels. Make the build fail if
* something moves a C function into the __irq_entry section.
*/
#define __irq_entry __invalid_section
static inline int irq_canonicalize(int irq)
{
return ((irq == 2) ? 9 : irq);
}
extern int irq_init_percpu_irqstack(unsigned int cpu);
#define __ARCH_HAS_DO_SOFTIRQ
struct irq_desc;
extern void fixup_irqs(void);
#ifdef CONFIG_HAVE_KVM
extern void kvm_set_posted_intr_wakeup_handler(void (*handler)(void));
#endif
extern void (*x86_platform_ipi_callback)(void);
extern void native_init_IRQ(void);
extern void __handle_irq(struct irq_desc *desc, struct pt_regs *regs);
extern __visible void do_IRQ(struct pt_regs *regs, unsigned long vector);
extern void init_ISA_irqs(void);
extern void __init init_IRQ(void);
#ifdef CONFIG_X86_LOCAL_APIC
void arch_trigger_cpumask_backtrace(const struct cpumask *mask,
bool exclude_self);
#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
#endif
#endif /* _ASM_X86_IRQ_H */