[PATCH v4 4/8] riscv/runtime-const: Replace open-coded placeholder with RUNTIME_MAGIC

[K Prateek Nayak]

Define the placeholder used for lui + addi[w] patching sequence as
RUNTIME_MAGIC and use that instead of open coding the constants in the
inline assembly.

No functional changes intended.

Suggested-by: Guo Ren <guoren at kernel.org>
Signed-off-by: K Prateek Nayak <kprateek.nayak at amd.com>
---
changelog v3..v4:

o New patch based on suggestions from Guo. (Thank you!)
---
 arch/riscv/include/asm/runtime-const.h | 38 ++++++++++++++------------
 1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/arch/riscv/include/asm/runtime-const.h b/arch/riscv/include/asm/runtime-const.h
index 900db0a103d05..1ce02605d2e43 100644
--- a/arch/riscv/include/asm/runtime-const.h
+++ b/arch/riscv/include/asm/runtime-const.h
@@ -15,21 +15,23 @@
 
 #include <linux/uaccess.h>
 
+#define RUNTIME_MAGIC __ASM_STR(0x89ABCDEF)
+
 #ifdef CONFIG_32BIT
-#define runtime_const_ptr(sym)					\
-({								\
-	typeof(sym) __ret;					\
-	asm_inline(".option push\n\t"				\
-		".option norvc\n\t"				\
-		"1:\t"						\
-		"lui	%[__ret],0x89abd\n\t"			\
-		"addi	%[__ret],%[__ret],-0x211\n\t"		\
-		".option pop\n\t"				\
-		".pushsection runtime_ptr_" #sym ",\"a\"\n\t"	\
-		".long 1b - .\n\t"				\
-		".popsection"					\
-		: [__ret] "=r" (__ret));			\
-	__ret;							\
+#define runtime_const_ptr(sym)						\
+({									\
+	typeof(sym) __ret;						\
+	asm_inline(".option push\n\t"					\
+		".option norvc\n\t"					\
+		"1:\t"							\
+		"lui	%[__ret], %%hi(" RUNTIME_MAGIC ")\n\t"		\
+		"addi	%[__ret],%[__ret], %%lo(" RUNTIME_MAGIC ")\n\t"	\
+		".option pop\n\t"					\
+		".pushsection runtime_ptr_" #sym ",\"a\"\n\t"		\
+		".long 1b - .\n\t"					\
+		".popsection"						\
+		: [__ret] "=r" (__ret));				\
+	__ret;								\
 })
 #else
 /*
@@ -46,10 +48,10 @@
 	".option push\n\t"					\
 	".option norvc\n\t"					\
 	"1:\t"							\
-	"lui	%[__ret],0x89abd\n\t"				\
-	"lui	%[__tmp],0x1234\n\t"				\
-	"addiw	%[__ret],%[__ret],-0x211\n\t"			\
-	"addiw	%[__tmp],%[__tmp],0x567\n\t"			\
+	"lui	%[__ret], %%hi(" RUNTIME_MAGIC ")\n\t"		\
+	"lui	%[__tmp], %%hi(" RUNTIME_MAGIC ")\n\t"		\
+	"addiw	%[__ret],%[__ret], %%lo(" RUNTIME_MAGIC ")\n\t"	\
+	"addiw	%[__tmp],%[__tmp], %%lo(" RUNTIME_MAGIC ")\n\t"	\
 
 #define RISCV_RUNTIME_CONST_64_BASE				\
 	"slli	%[__tmp],%[__tmp],32\n\t"			\
-- 
2.34.1