From 2c058b03cc06ba485169778a271f87e5ac57dd83 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 25 Feb 2020 23:33:22 +0100 Subject: [PATCH] x86/idtentry: Provide IDTENTRY_IST Same as IDTENTRY but for exceptions which run on Interrupt Stacks (IST) on 64bit. For 32bit this maps to IDTENTRY. There are 3 variants which will be used: IDTENTRY_MCE IDTENTRY_DB IDTENTRY_NMI These map to IDTENTRY_IST, but only the MCE and DB variants are emitting ASM code as the NMI entry needs hand crafted ASM still. The function defines do not contain any idtenter/exit calls as these exceptions need special treatment. Signed-off-by: Thomas Gleixner Reviewed-by: Alexandre Chartre Acked-by: Peter Zijlstra Acked-by: Andy Lutomirski Link: https://lkml.kernel.org/r/20200505135314.137125609@linutronix.de --- arch/x86/include/asm/idtentry.h | 54 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h index 3dc4d5b..3edd6d0 100644 --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -132,6 +132,42 @@ static __always_inline void __##func(struct pt_regs *regs, \ #define DEFINE_IDTENTRY_RAW(func) \ __visible noinstr void func(struct pt_regs *regs) +#ifdef CONFIG_X86_64 +/** + * DECLARE_IDTENTRY_IST - Declare functions for IST handling IDT entry points + * @vector: Vector number (ignored for C) + * @func: Function name of the entry point + * + * Maps to DECLARE_IDTENTRY_RAW + */ +#define DECLARE_IDTENTRY_IST(vector, func) \ + DECLARE_IDTENTRY_RAW(vector, func) + +/** + * DEFINE_IDTENTRY_IST - Emit code for IST entry points + * @func: Function name of the entry point + * + * Maps to DEFINE_IDTENTRY_RAW + */ +#define DEFINE_IDTENTRY_IST(func) \ + DEFINE_IDTENTRY_RAW(func) + +#else /* CONFIG_X86_64 */ +/* Maps to a regular IDTENTRY on 32bit for now */ +# define DECLARE_IDTENTRY_IST DECLARE_IDTENTRY +# define DEFINE_IDTENTRY_IST DEFINE_IDTENTRY +#endif /* !CONFIG_X86_64 */ + +/* C-Code mapping */ +#define DECLARE_IDTENTRY_MCE DECLARE_IDTENTRY_IST +#define DEFINE_IDTENTRY_MCE DEFINE_IDTENTRY_IST + +#define DECLARE_IDTENTRY_NMI DECLARE_IDTENTRY_IST +#define DEFINE_IDTENTRY_NMI DEFINE_IDTENTRY_IST + +#define DECLARE_IDTENTRY_DEBUG DECLARE_IDTENTRY_IST +#define DEFINE_IDTENTRY_DEBUG DEFINE_IDTENTRY_IST + #else /* !__ASSEMBLY__ */ /* @@ -149,6 +185,24 @@ __visible noinstr void func(struct pt_regs *regs) #define DECLARE_IDTENTRY_RAW(vector, func) \ DECLARE_IDTENTRY(vector, func) +#ifdef CONFIG_X86_64 +# define DECLARE_IDTENTRY_MCE(vector, func) \ + idtentry_mce_db vector asm_##func func + +# define DECLARE_IDTENTRY_DEBUG(vector, func) \ + idtentry_mce_db vector asm_##func func + +#else +# define DECLARE_IDTENTRY_MCE(vector, func) \ + DECLARE_IDTENTRY(vector, func) + +# define DECLARE_IDTENTRY_DEBUG(vector, func) \ + DECLARE_IDTENTRY(vector, func) +#endif + +/* No ASM code emitted for NMI */ +#define DECLARE_IDTENTRY_NMI(vector, func) + #endif /* __ASSEMBLY__ */ /* -- 2.7.4