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Subject[tip: x86/entry] x86/idtentry: Provide IDTENTRY_RAW
The following commit has been merged into the x86/entry branch of tip:

Commit-ID: e448b97001b48f410dd9843f4611e879db261ee2
Gitweb: https://git.kernel.org/tip/e448b97001b48f410dd9843f4611e879db261ee2
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 04 Mar 2020 15:22:09 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Tue, 19 May 2020 16:04:06 +02:00

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



---
arch/x86/include/asm/idtentry.h | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index ee6ebfe..2f31d03 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__ */

/*
\
 
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