[glibc] Move RETURN_TO to x86/sysdep.h and implement x86_64 version.

[glibc] Move RETURN_TO to x86/sysdep.h and implement x86_64 version.

[Samuel Thibault]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a1dcc64c9b6e54ce1aabcd10785f43bf2b445ee4

commit a1dcc64c9b6e54ce1aabcd10785f43bf2b445ee4
Author: Flavio Cruz <flaviocruz@gmail.com>
Date:   Sun Feb 5 03:23:25 2023 -0500

    Move RETURN_TO to x86/sysdep.h and implement x86_64 version.
    
    Message-Id: <Y99nfeBrTubZL9oi@jupiter.tail36e24.ts.net>

Diff:
---
 sysdeps/mach/i386/sysdep.h | 34 ----------------------------------
 sysdeps/mach/x86/sysdep.h  | 17 +++++++++++++++++
 2 files changed, 17 insertions(+), 34 deletions(-)

diff --git a/sysdeps/mach/i386/sysdep.h b/sysdeps/mach/i386/sysdep.h
deleted file mode 100644
index 33bd5ee402..0000000000
--- a/sysdeps/mach/i386/sysdep.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/* Copyright (C) 1991-2023 Free Software Foundation, Inc.
-
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#ifndef _MACH_I386_SYSDEP_H
-#define _MACH_I386_SYSDEP_H 1
-
-#include <sysdeps/mach/x86/sysdep.h>
-
-#define RETURN_TO(sp, pc, retval) \
-  asm volatile ("movl %0, %%esp; jmp %*%1 # %2" \
-		: : "g" (sp), "r" (pc), "a" (retval))
-
-/* This should be rearranged, but at the moment this file provides
-   the most useful definitions for assembler syntax details.  */
-#undef ENTRY
-#undef ALIGN
-#include <sysdeps/unix/i386/sysdep.h>
-
-#endif /* mach/i386/sysdep.h */
diff --git a/sysdeps/mach/x86/sysdep.h b/sysdeps/mach/x86/sysdep.h
index 90f295b27d..7ad785234f 100644
--- a/sysdeps/mach/x86/sysdep.h
+++ b/sysdeps/mach/x86/sysdep.h
@@ -44,4 +44,21 @@
 /* Get the machine-independent Mach definitions.  */
 #include <sysdeps/mach/sysdep.h>
 
+#undef ENTRY
+#undef ALIGN
+
+#ifdef __x86_64__
+#define RETURN_TO(sp, pc, retval) \
+  asm volatile ("movq %0, %%rsp; jmp %*%1 # %2" \
+		: : "g" (sp), "r" (pc), "a" (retval))
+/* This should be rearranged, but at the moment this file provides
+   the most useful definitions for assembler syntax details.  */
+#include <sysdeps/unix/x86_64/sysdep.h>
+#else
+#define RETURN_TO(sp, pc, retval) \
+  asm volatile ("movl %0, %%esp; jmp %*%1 # %2" \
+		: : "g" (sp), "r" (pc), "a" (retval))
+#include <sysdeps/unix/i386/sysdep.h>
+#endif
+
 #endif /* mach/x86/sysdep.h */