x86/idtentry: Provide IDTENTRY_ERRORCODE

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

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index 0c33740..f35d5c9 100644 (file)
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -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__ */
 
 /*