linux-kernel - [PATCH 4/5] x86/syscall/x32: Move x32 syscall table

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Message-ID: <20250313182236.655724-5-brgerst@gmail.com>
Date: Thu, 13 Mar 2025 14:22:35 -0400
From: Brian Gerst <brgerst@...il.com>
To: linux-kernel@...r.kernel.org,
	x86@...nel.org
Cc: Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...nel.org>,
	Juergen Gross <jgross@...e.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Brian Gerst <brgerst@...il.com>
Subject: [PATCH 4/5] x86/syscall/x32: Move x32 syscall table

Since commit:

  2e958a8a510d ("x86/entry/x32: Rename __x32_compat_sys_* to
		 __x64_compat_sys_*"),

the ABI prefix for x32 syscalls is the same as native 64-bit
syscalls.  Move the x32 syscall table to syscall_64.c

No functional changes.

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/entry/Makefile      |  1 -
 arch/x86/entry/syscall_64.c  | 13 +++++++++++++
 arch/x86/entry/syscall_x32.c | 25 -------------------------
 3 files changed, 13 insertions(+), 26 deletions(-)
 delete mode 100644 arch/x86/entry/syscall_x32.c

diff --git a/arch/x86/entry/Makefile b/arch/x86/entry/Makefile
index 5fd28abfd5a0..e870f8aa936c 100644
--- a/arch/x86/entry/Makefile
+++ b/arch/x86/entry/Makefile
@@ -27,4 +27,3 @@ CFLAGS_REMOVE_entry_fred.o	+= -pg $(CC_FLAGS_FTRACE)
 obj-$(CONFIG_X86_FRED)		+= entry_64_fred.o entry_fred.o
 
 obj-$(CONFIG_IA32_EMULATION)	+= entry_64_compat.o syscall_32.o
-obj-$(CONFIG_X86_X32_ABI)	+= syscall_x32.o
diff --git a/arch/x86/entry/syscall_64.c b/arch/x86/entry/syscall_64.c
index 9e0ba339013c..b96f5621a2aa 100644
--- a/arch/x86/entry/syscall_64.c
+++ b/arch/x86/entry/syscall_64.c
@@ -19,6 +19,9 @@
 #define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *);
 #define __SYSCALL_NORETURN(nr, sym) extern long __noreturn __x64_##sym(const struct pt_regs *);
 #include <asm/syscalls_64.h>
+#ifdef CONFIG_X86_X32_ABI
+#include <asm/syscalls_x32.h>
+#endif
 #undef  __SYSCALL
 
 #undef  __SYSCALL_NORETURN
@@ -44,6 +47,16 @@ long x64_sys_call(const struct pt_regs *regs, unsigned int nr)
 	}
 };
 
+#ifdef CONFIG_X86_X32_ABI
+long x32_sys_call(const struct pt_regs *regs, unsigned int nr)
+{
+	switch (nr) {
+	#include <asm/syscalls_x32.h>
+	default: return __x64_sys_ni_syscall(regs);
+	}
+};
+#endif
+
 static __always_inline bool do_syscall_x64(struct pt_regs *regs, int nr)
 {
 	/*
diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c
deleted file mode 100644
index fb77908f44f3..000000000000
--- a/arch/x86/entry/syscall_x32.c
+++ /dev/null
@@ -1,25 +0,0 @@
-// 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/syscall.h>
-
-#define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *);
-#define __SYSCALL_NORETURN(nr, sym) extern long __noreturn __x64_##sym(const struct pt_regs *);
-#include <asm/syscalls_x32.h>
-#undef  __SYSCALL
-
-#undef  __SYSCALL_NORETURN
-#define __SYSCALL_NORETURN __SYSCALL
-
-#define __SYSCALL(nr, sym) case nr: return __x64_##sym(regs);
-long x32_sys_call(const struct pt_regs *regs, unsigned int nr)
-{
-	switch (nr) {
-	#include <asm/syscalls_x32.h>
-	default: return __x64_sys_ni_syscall(regs);
-	}
-};
-- 
2.48.1