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authorH.J. Lu <hjl.tools@gmail.com>2017-11-01 05:37:10 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-11-01 05:37:26 -0700
commit95b93c6e0d7bf0321f265cf6e85c7fb4417cbda6 (patch)
treef43d997aba07996bd5f6b7ed8035920dcc4c2d0f /sysdeps/x86
parent1bb3653925eae1226cd18a3d700371291850b20f (diff)
downloadglibc-95b93c6e0d7bf0321f265cf6e85c7fb4417cbda6.tar.gz
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.
Diffstat (limited to 'sysdeps/x86')
-rw-r--r--sysdeps/x86/sysdep.h69
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 */