x86: Add sysdeps/x86/sysdep.h

Add a new header file, sysdeps/x86/sysdep.h, for common assembly code
macros between i386 and x86-64.  Tested on i686 and x86-64.  There are
no differences in outputs of "readelf -a" and "objdump -dw" on all glibc
shared objects before and after the patch.

	* sysdeps/i386/sysdep.h: Include <sysdeps/x86/sysdep.h> instead
	of <sysdeps/generic/sysdep.h>.
	(ALIGNARG): Removed.
	(ASM_SIZE_DIRECTIVE): Likewise.
	(ENTRY): Likewise.
	(END): Likewise.
	(ENTRY_CHK): Likewise.
	(END_CHK): Likewise.
	(syscall_error): Likewise.
	(mcount): Likewise.
	(PSEUDO_END): Likewise.
	(L): Likewise.
	(atom_text_section): Likewise.
	* sysdeps/x86/sysdep.h: New file.
	* sysdeps/x86_64/sysdep.h: Include <sysdeps/x86/sysdep.h> instead
	of <sysdeps/generic/sysdep.h>.
	(ALIGNARG): Removed.
	(ASM_SIZE_DIRECTIVE): Likewise.
	(ENTRY): Likewise.
	(END): Likewise.
	(ENTRY_CHK): Likewise.
	(END_CHK): Likewise.
	(syscall_error): Likewise.
	(mcount): Likewise.
	(PSEUDO_END): Likewise.
	(L): Likewise.
	(atom_text_section): Likewise.

1 files changed, 69 insertions, 0 deletions

diff --git a/sysdeps/x86/sysdep.h b/sysdeps/x86/sysdep.h
new file mode 100644
index 0000000000..eb25e4b658
--- /dev/null
+++ b/sysdeps/x86/sysdep.h
@@ -0,0 +1,69 @@
+/* Assembler macros for x86.
+   Copyright (C) 2017 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _X86_SYSDEP_H
+#define _X86_SYSDEP_H 1
+
+#include <sysdeps/generic/sysdep.h>
+
+#ifdef	__ASSEMBLER__
+
+/* Syntactic details of assembler.  */
+
+/* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
+#define ALIGNARG(log2) 1<<log2
+#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
+
+/* Define an entry point visible from C.  */
+#define	ENTRY(name)							      \
+  .globl C_SYMBOL_NAME(name);						      \
+  .type C_SYMBOL_NAME(name),@function;					      \
+  .align ALIGNARG(4);							      \
+  C_LABEL(name)								      \
+  cfi_startproc;							      \
+  CALL_MCOUNT
+
+#undef	END
+#define END(name)							      \
+  cfi_endproc;								      \
+  ASM_SIZE_DIRECTIVE(name)
+
+#define ENTRY_CHK(name) ENTRY (name)
+#define END_CHK(name) END (name)
+
+/* Since C identifiers are not normally prefixed with an underscore
+   on this system, the asm identifier `syscall_error' intrudes on the
+   C name space.  Make sure we use an innocuous name.  */
+#define	syscall_error	__syscall_error
+#define mcount		_mcount
+
+#undef	PSEUDO_END
+#define	PSEUDO_END(name)						      \
+  END (name)
+
+/* Local label name for asm code. */
+#ifndef L
+/* ELF-like local names start with `.L'.  */
+# define L(name)	.L##name
+#endif
+
+#define atom_text_section .section ".text.atom", "ax"
+
+#endif	/* __ASSEMBLER__ */
+
+#endif	/* _X86_SYSDEP_H */