1 files changed, 104 insertions, 0 deletions
diff --git a/sysdeps/x86/sysdep.h b/sysdeps/x86/sysdep.h
new file mode 100644
index 0000000000..8776ad8374
--- /dev/null
+++ b/sysdeps/x86/sysdep.h
@@ -0,0 +1,104 @@
+/* Assembler macros for x86.
+   Copyright (C) 2017-2018 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>
+
+/* __CET__ is defined by GCC with Control-Flow Protection values:
+
+enum cf_protection_level
+{
+  CF_NONE = 0,
+  CF_BRANCH = 1 << 0,
+  CF_RETURN = 1 << 1,
+  CF_FULL = CF_BRANCH | CF_RETURN,
+  CF_SET = 1 << 2
+};
+*/
+
+/* Set if CF_BRANCH (IBT) is enabled.  */
+#define X86_FEATURE_1_IBT	(1U << 0)
+/* Set if CF_RETURN (SHSTK) is enabled.  */
+#define X86_FEATURE_1_SHSTK	(1U << 1)
+
+#ifdef __CET__
+# define CET_ENABLED	1
+# define IBT_ENABLED	(__CET__ & X86_FEATURE_1_IBT)
+# define SHSTK_ENABLED	(__CET__ & X86_FEATURE_1_SHSTK)
+#else
+# define CET_ENABLED	0
+# define IBT_ENABLED	0
+# define SHSTK_ENABLED	0
+#endif
+
+#ifdef	__ASSEMBLER__
+
+/* Syntactic details of assembler.  */
+
+#ifdef _CET_ENDBR
+# define _CET_NOTRACK notrack
+#else
+# define _CET_ENDBR
+# define _CET_NOTRACK
+#endif
+
+/* 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;							      \
+  _CET_ENDBR;								      \
+  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 */