x86/idtentry: Provide IDTENTRY_DF (6a8dfa8e) · Commits · 戴 / test

arch/x86/include/asm/idtentry.h

+87 −0

Original line number	Diff line number	Diff line
		@@ -132,6 +132,35 @@ static __always_inline void __##func(struct pt_regs *regs, \
		#define DEFINE_IDTENTRY_RAW(func) \
		__visible noinstr void func(struct pt_regs *regs)

		/**
		* DECLARE_IDTENTRY_RAW_ERRORCODE - Declare functions for raw IDT entry points
		* Error code pushed by hardware
		* @vector: Vector number (ignored for C)
		* @func: Function name of the entry point
		*
		* Maps to DECLARE_IDTENTRY_ERRORCODE()
		*/
		#define DECLARE_IDTENTRY_RAW_ERRORCODE(vector, func) \
		DECLARE_IDTENTRY_ERRORCODE(vector, func)

		/**
		* DEFINE_IDTENTRY_RAW_ERRORCODE - Emit code for raw IDT entry points
		* @func: Function name of the entry point
		*
		* @func is called from ASM entry code with interrupts disabled.
		*
		* The macro is written so it acts as function definition. Append the
		* body with a pair of curly brackets.
		*
		* Contrary to DEFINE_IDTENTRY_ERRORCODE() this does not invoke the
		* idtentry_enter/exit() helpers before and after the body invocation. This
		* needs to be done in the body itself if applicable. Use if extra work
		* is required before the enter/exit() helpers are invoked.
		*/
		#define DEFINE_IDTENTRY_RAW_ERRORCODE(func) \
		__visible noinstr void func(struct pt_regs *regs, unsigned long error_code)


		#ifdef CONFIG_X86_64
		/**
		* DECLARE_IDTENTRY_IST - Declare functions for IST handling IDT entry points
		@@ -165,10 +194,58 @@ __visible noinstr void func(struct pt_regs *regs)
		#define DEFINE_IDTENTRY_NOIST(func) \
		DEFINE_IDTENTRY_RAW(noist_##func)

		/**
		* DECLARE_IDTENTRY_DF - Declare functions for double fault
		* @vector: Vector number (ignored for C)
		* @func: Function name of the entry point
		*
		* Maps to DECLARE_IDTENTRY_RAW_ERRORCODE
		*/
		#define DECLARE_IDTENTRY_DF(vector, func) \
		DECLARE_IDTENTRY_RAW_ERRORCODE(vector, func)

		/**
		* DEFINE_IDTENTRY_DF - Emit code for double fault
		* @func: Function name of the entry point
		*
		* Maps to DEFINE_IDTENTRY_RAW_ERRORCODE
		*/
		#define DEFINE_IDTENTRY_DF(func) \
		DEFINE_IDTENTRY_RAW_ERRORCODE(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

		/**
		* DECLARE_IDTENTRY_DF - Declare functions for double fault 32bit variant
		* @vector: Vector number (ignored for C)
		* @func: Function name of the entry point
		*
		* Declares two functions:
		* - The ASM entry point: asm_##func
		* - The C handler called from the C shim
		*/
		#define DECLARE_IDTENTRY_DF(vector, func) \
		asmlinkage void asm_##func(void); \
		__visible void func(struct pt_regs *regs, \
		unsigned long error_code, \
		unsigned long address)

		/**
		* DEFINE_IDTENTRY_DF - Emit code for double fault on 32bit
		* @func: Function name of the entry point
		*
		* This is called through the doublefault shim which already provides
		* cr2 in the address argument.
		*/
		#define DEFINE_IDTENTRY_DF(func) \
		__visible noinstr void func(struct pt_regs *regs, \
		unsigned long error_code, \
		unsigned long address)

		#endif /* !CONFIG_X86_64 */

		/* C-Code mapping */
		@@ -212,6 +289,9 @@ __visible noinstr void func(struct pt_regs *regs)
		#define DECLARE_IDTENTRY_RAW(vector, func) \
		DECLARE_IDTENTRY(vector, func)

		#define DECLARE_IDTENTRY_RAW_ERRORCODE(vector, func) \
		DECLARE_IDTENTRY_ERRORCODE(vector, func)

		#ifdef CONFIG_X86_64
		# define DECLARE_IDTENTRY_MCE(vector, func) \
		idtentry_mce_db vector asm_##func func
		@@ -219,12 +299,19 @@ __visible noinstr void func(struct pt_regs *regs)
		# define DECLARE_IDTENTRY_DEBUG(vector, func) \
		idtentry_mce_db vector asm_##func func

		# define DECLARE_IDTENTRY_DF(vector, func) \
		idtentry_df 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)

		/* No ASM emitted for DF as this goes through a C shim */
		# define DECLARE_IDTENTRY_DF(vector, func)

		#endif

		/* No ASM code emitted for NMI */

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