linux-kernel - [patch V4 part 3 20/29] x86/entry: Provide IDTENTRY

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Date:   Tue, 05 May 2020 15:44:14 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>
Subject: [patch V4 part 3 20/29] x86/entry: Provide IDTENTRY_ERRORCODE

From: Thomas Gleixner <tglx@...utronix.de>

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

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/include/asm/idtentry.h |   46 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -57,6 +57,49 @@ static __always_inline void __##func(str
 									\
 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);						\
+	instr_begin();							\
+	__##func (regs, error_code);					\
+	instr_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(str
 #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__ */
 
 /*