1 files changed, 35 insertions, 10 deletions

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 2bec0c89a95c..f963848024a5 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -2,7 +2,7 @@
 #ifndef _ASM_X86_ASM_H
 #define _ASM_X86_ASM_H
 
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 # define __ASM_FORM(x, ...)		x,## __VA_ARGS__
 # define __ASM_FORM_RAW(x, ...)		x,## __VA_ARGS__
 # define __ASM_FORM_COMMA(x, ...)	x,## __VA_ARGS__,
@@ -113,18 +113,13 @@
 
 #endif
 
-#ifndef __ASSEMBLY__
-#ifndef __pic__
+#ifndef __ASSEMBLER__
 static __always_inline __pure void *rip_rel_ptr(void *p)
 {
 	asm("leaq %c1(%%rip), %0" : "=r"(p) : "i"(p));
 
 	return p;
 }
-#define RIP_REL_REF(var)	(*(typeof(&(var)))rip_rel_ptr(&(var)))
-#else
-#define RIP_REL_REF(var)	(var)
-#endif
 #endif
 
 /*
@@ -144,7 +139,7 @@ static __always_inline __pure void *rip_rel_ptr(void *p)
 # include <asm/extable_fixup_types.h>
 
 /* Exception table entry */
-#ifdef __ASSEMBLY__
+#ifdef __ASSEMBLER__
 
 # define _ASM_EXTABLE_TYPE(from, to, type)			\
 	.pushsection "__ex_table","a" ;				\
@@ -164,7 +159,7 @@ static __always_inline __pure void *rip_rel_ptr(void *p)
 #  define _ASM_NOKPROBE(entry)
 # endif
 
-#else /* ! __ASSEMBLY__ */
+#else /* ! __ASSEMBLER__ */
 
 # define DEFINE_EXTABLE_TYPE_REG \
 	".macro extable_type_reg type:req reg:req\n"						\
@@ -213,6 +208,17 @@ static __always_inline __pure void *rip_rel_ptr(void *p)
 
 /* For C file, we already have NOKPROBE_SYMBOL macro */
 
+/* Insert a comma if args are non-empty */
+#define COMMA(x...)		__COMMA(x)
+#define __COMMA(...)		, ##__VA_ARGS__
+
+/*
+ * Combine multiple asm inline constraint args into a single arg for passing to
+ * another macro.
+ */
+#define ASM_OUTPUT(x...)	x
+#define ASM_INPUT(x...)		x
+
 /*
  * This output constraint should be used for any inline asm which has a "call"
  * instruction.  Otherwise the asm may be inserted before the frame pointer
@@ -221,7 +227,7 @@ static __always_inline __pure void *rip_rel_ptr(void *p)
  */
 register unsigned long current_stack_pointer asm(_ASM_SP);
 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #define _ASM_EXTABLE(from, to)					\
 	_ASM_EXTABLE_TYPE(from, to, EX_TYPE_DEFAULT)
@@ -232,5 +238,24 @@ register unsigned long current_stack_pointer asm(_ASM_SP);
 #define _ASM_EXTABLE_FAULT(from, to)				\
 	_ASM_EXTABLE_TYPE(from, to, EX_TYPE_FAULT)
 
+/*
+ * Both i386 and x86_64 returns 64-bit values in edx:eax for certain
+ * instructions, but GCC's "A" constraint has different meanings.
+ * For i386, "A" means exactly edx:eax, while for x86_64 it
+ * means rax *or* rdx.
+ *
+ * These helpers wrapping these semantic differences save one instruction
+ * clearing the high half of 'low':
+ */
+#ifdef CONFIG_X86_64
+# define EAX_EDX_DECLARE_ARGS(val, low, high)	unsigned long low, high
+# define EAX_EDX_VAL(val, low, high)		((low) | (high) << 32)
+# define EAX_EDX_RET(val, low, high)		"=a" (low), "=d" (high)
+#else
+# define EAX_EDX_DECLARE_ARGS(val, low, high)	u64 val
+# define EAX_EDX_VAL(val, low, high)		(val)
+# define EAX_EDX_RET(val, low, high)		"=A" (val)
+#endif
+
 #endif /* __KERNEL__ */
 #endif /* _ASM_X86_ASM_H */