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x86/idtentry: Provide IDTENTRY_RAW 

Some exception handlers need to do extra work before any of the entry
helpers are invoked. Provide IDTENTRY_RAW for this.

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/20200505135313.830540017@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-03-04 15:22:09 +01:00
parent f64366efd8
commit 0dc6cdc21b
1 changed files with 31 additions and 0 deletions
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31
arch/x86/include/asm/idtentry.h
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@ -104,6 +104,34 @@ __visible noinstr void func(struct pt_regs *regs, \
static __always_inline void __##func(struct pt_regs *regs, \
unsigned long error_code)
/**
* DECLARE_IDTENTRY_RAW - Declare functions for raw IDT entry points
* No error code pushed by hardware
* @vector: Vector number (ignored for C)
* @func: Function name of the entry point
*
* Maps to DECLARE_IDTENTRY().
*/
#define DECLARE_IDTENTRY_RAW(vector, func) \
DECLARE_IDTENTRY(vector, func)
/**
* DEFINE_IDTENTRY_RAW - 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() 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(func) \
__visible noinstr void func(struct pt_regs *regs)
#else /* !__ASSEMBLY__ */
/*
@ -118,6 +146,9 @@ static __always_inline void __##func(struct pt_regs *regs, \
/* Special case for 32bit IRET 'trap'. Do not emit ASM code */
#define DECLARE_IDTENTRY_SW(vector, func)
#define DECLARE_IDTENTRY_RAW(vector, func) \
DECLARE_IDTENTRY(vector, func)
#endif /* __ASSEMBLY__ */
/*