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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-03-04 15:22:09 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 15:14:54 +0200 |
| commit | 0dc6cdc21b94eed8cdacf34eabb4175cebd13775 (patch) | |
| tree | 006b65ff33875f2f57fb8d239be72ac03b78722a | |
| parent | f64366efd8c60b93138b813d071d2cd201fd0f6e (diff) | |
| download | linux-0dc6cdc21b94eed8cdacf34eabb4175cebd13775.tar.gz | |
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
| -rw-r--r-- | arch/x86/include/asm/idtentry.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h index ee6ebfef7e57dd..2f31d03f3e57c6 100644 --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -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__ */ /* |