x86/entry/64: Split X32 syscall table into its own file

Since X32 has its own syscall table now, move it to a separate file.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/20200313195144.164260-8-brgerst@gmail.com

arch/x86/entry/Makefile

@@ -14,4 +14,5 @@ obj-y				+= vdso/
 obj-y				+= vsyscall/
 
 obj-$(CONFIG_IA32_EMULATION)	+= entry_64_compat.o syscall_32.o
+obj-$(CONFIG_X86_X32_ABI)	+= syscall_x32.o
 

arch/x86/entry/syscall_64.c

@@ -8,14 +8,13 @@
 #include <asm/asm-offsets.h>
 #include <asm/syscall.h>
 
+#define __SYSCALL_X32(nr, sym, qual)
+
 #define __SYSCALL_64(nr, sym, qual) extern asmlinkage long sym(const struct pt_regs *);
-#define __SYSCALL_X32(nr, sym, qual) __SYSCALL_64(nr, sym, qual)
 #include <asm/syscalls_64.h>
 #undef __SYSCALL_64
-#undef __SYSCALL_X32
 
 #define __SYSCALL_64(nr, sym, qual) [nr] = sym,
-#define __SYSCALL_X32(nr, sym, qual)
 
 asmlinkage const sys_call_ptr_t sys_call_table[__NR_syscall_max+1] = {
 	/*
@@ -25,25 +24,3 @@ asmlinkage const sys_call_ptr_t sys_call_table[__NR_syscall_max+1] = {
 	[0 ... __NR_syscall_max] = &__x64_sys_ni_syscall,
 #include <asm/syscalls_64.h>
 };
-
-#undef __SYSCALL_64
-#undef __SYSCALL_X32
-
-#ifdef CONFIG_X86_X32_ABI
-
-#define __SYSCALL_64(nr, sym, qual)
-#define __SYSCALL_X32(nr, sym, qual) [nr] = sym,
-
-asmlinkage const sys_call_ptr_t x32_sys_call_table[__NR_syscall_x32_max+1] = {
-	/*
-	 * Smells like a compiler bug -- it doesn't work
-	 * when the & below is removed.
-	 */
-	[0 ... __NR_syscall_x32_max] = &__x64_sys_ni_syscall,
-#include <asm/syscalls_64.h>
-};
-
-#undef __SYSCALL_64
-#undef __SYSCALL_X32
-
-#endif

arch/x86/entry/syscall_x32.c

+// SPDX-License-Identifier: GPL-2.0
+/* System call table for x32 ABI. */
+
+#include <linux/linkage.h>
+#include <linux/sys.h>
+#include <linux/cache.h>
+#include <linux/syscalls.h>
+#include <asm/asm-offsets.h>
+#include <asm/syscall.h>
+
+#define __SYSCALL_64(nr, sym, qual)
+
+#define __SYSCALL_X32(nr, sym, qual) extern asmlinkage long sym(const struct pt_regs *);
+#include <asm/syscalls_64.h>
+#undef __SYSCALL_X32
+
+#define __SYSCALL_X32(nr, sym, qual) [nr] = sym,
+
+asmlinkage const sys_call_ptr_t x32_sys_call_table[__NR_syscall_x32_max+1] = {
+	/*
+	 * Smells like a compiler bug -- it doesn't work
+	 * when the & below is removed.
+	 */
+	[0 ... __NR_syscall_x32_max] = &__x64_sys_ni_syscall,
+#include <asm/syscalls_64.h>
+};