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x86/idtentry: Provide IDTENTRY_ERRORCODE

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Same as IDTENTRY but the C entry point has an error code argument.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134905.258989060@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-02-25 23:16:21 +01:00
parent f95658fdb5
commit aabfe5383e
1 changed files with 46 additions and 0 deletions
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46
arch/x86/include/asm/idtentry.h
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@@ -57,6 +57,49 @@ __visible noinstr void func(struct pt_regs *regs) \
\
static __always_inline void __##func(struct pt_regs *regs)
/**
* DECLARE_IDTENTRY_ERRORCODE - Declare functions for simple IDT entry points
* Error code pushed by hardware
* @vector: Vector number (ignored for C)
* @func: Function name of the entry point
*
* Declares three functions:
* - The ASM entry point: asm_##func
* - The XEN PV trap entry point: xen_##func (maybe unused)
* - The C handler called from the ASM entry point
*
* Same as DECLARE_IDTENTRY, but has an extra error_code argument for the
* C-handler.
*/
#define DECLARE_IDTENTRY_ERRORCODE(vector, func) \
asmlinkage void asm_##func(void); \
asmlinkage void xen_asm_##func(void); \
__visible void func(struct pt_regs *regs, unsigned long error_code)
/**
* DEFINE_IDTENTRY_ERRORCODE - Emit code for simple IDT entry points
* Error code pushed by hardware
* @func: Function name of the entry point
*
* Same as DEFINE_IDTENTRY, but has an extra error_code argument
*/
#define DEFINE_IDTENTRY_ERRORCODE(func) \
static __always_inline void __##func(struct pt_regs *regs, \
unsigned long error_code); \
\
__visible noinstr void func(struct pt_regs *regs, \
unsigned long error_code) \
{ \
idtentry_enter(regs); \
instrumentation_begin(); \
__##func (regs, error_code); \
instrumentation_end(); \
idtentry_exit(regs); \
} \
\
static __always_inline void __##func(struct pt_regs *regs, \
unsigned long error_code)
#else /* !__ASSEMBLY__ */
/*
@@ -65,6 +108,9 @@ static __always_inline void __##func(struct pt_regs *regs)
#define DECLARE_IDTENTRY(vector, func) \
idtentry vector asm_##func func has_error_code=0 sane=1
#define DECLARE_IDTENTRY_ERRORCODE(vector, func) \
idtentry vector asm_##func func has_error_code=1 sane=1
#endif /* __ASSEMBLY__ */
/*