[PATCH RESEND v9 28/36] x86/idtentry: Incorporate declaration/definition of the FRED exception handler type

[Xin Li]

The existing IDT exception C-handlers of X86_TRAP_TS, X86_TRAP_NP,
X86_TRAP_SS, X86_TRAP_GP, X86_TRAP_AC and X86_TRAP_CP take an error
code as the second argument, thus their FRED version handlers simply
call the corresponding existing IDT handlers with orig_ax from the
pt_regs structure as the second argument.

Tested-by: Shan Kang <shan.kang@xxxxxxxxx>
Signed-off-by: Xin Li <xin3.li@xxxxxxxxx>
---
 arch/x86/include/asm/idtentry.h | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index e67d111bf932..3b743c3fbe91 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -11,6 +11,7 @@
 #include <linux/entry-common.h>
 #include <linux/hardirq.h>
 
+#include <asm/fred.h>
 #include <asm/irq_stack.h>
 
 /**
@@ -67,13 +68,16 @@ static __always_inline void __##func(struct pt_regs *regs)
 
 /**
  * DECLARE_IDTENTRY_ERRORCODE - Declare functions for simple IDT entry points
+ *				and their corresponding software based
+ *				dispatch handler
  *				Error code pushed by hardware
  * @vector:	Vector number (ignored for C)
  * @func:	Function name of the entry point
  *
- * Declares three functions:
+ * Declares four functions:
  * - The ASM entry point: asm_##func
  * - The XEN PV trap entry point: xen_##func (maybe unused)
+ * - The C handler called from the FRED event dispatch framework
  * - The C handler called from the ASM entry point
  *
  * Same as DECLARE_IDTENTRY, but has an extra error_code argument for the
@@ -82,14 +86,19 @@ static __always_inline void __##func(struct pt_regs *regs)
 #define DECLARE_IDTENTRY_ERRORCODE(vector, func)			\
 	asmlinkage void asm_##func(void);				\
 	asmlinkage void xen_asm_##func(void);				\
+	__visible DECLARE_FRED_HANDLER(fred_##func);			\
 	__visible void func(struct pt_regs *regs, unsigned long error_code)
 
 /**
  * DEFINE_IDTENTRY_ERRORCODE - Emit code for simple IDT entry points
+ *			       and their corresponding software based
+ *			       dispatch handler
  *			       Error code pushed by hardware
  * @func:	Function name of the entry point
  *
- * Same as DEFINE_IDTENTRY, but has an extra error_code argument
+ * Same as DEFINE_IDTENTRY, but has an extra error_code argument. The
+ * fred_func() simply calls func() with passing orig_ax as its second
+ * argument.
  */
 #define DEFINE_IDTENTRY_ERRORCODE(func)					\
 static __always_inline void __##func(struct pt_regs *regs,		\
@@ -106,6 +115,11 @@ __visible noinstr void func(struct pt_regs *regs,			\
 	irqentry_exit(regs, state);					\
 }									\
 									\
+__visible DEFINE_FRED_HANDLER(fred_##func)				\
+{									\
+	func(regs, regs->orig_ax);					\
+}									\
+									\
 static __always_inline void __##func(struct pt_regs *regs,		\
 				     unsigned long error_code)
 
-- 
2.34.1