/* 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

/* Offset for fxsave/xsave area used by _dl_runtime_resolve.  Also need

   space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX.  It must be

   aligned to 16 bytes for fxsave and 64 bytes for xsave.  */

#define STATE_SAVE_OFFSET (8 * 7 + 8)

/* Save SSE, AVX, AVX512, mask and bound registers.  */

#define STATE_SAVE_MASK \

  ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 5) | (1 << 6) | (1 << 7))

#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<

#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 */