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x86/idtentry: Provide IDTENTRY_DF

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Provide a separate macro for #DF as this needs to emit paranoid only code
and has also a special ASM stub in 32bit.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200505135315.583415264@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-02-25 23:33:30 +01:00
parent 865d3a9afe
commit 6a8dfa8e40
1 changed files with 87 additions and 0 deletions
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87
arch/x86/include/asm/idtentry.h
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@ -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 */