glibc/sysdeps/x86/sysdep.h

/* Assembler macros for x86.
   Copyright (C) 2017-2024 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 _X86_SYSDEP_H
#define _X86_SYSDEP_H 1

#include <sysdeps/generic/sysdep.h>

/* The extended state feature IDs in the state component bitmap.  */
#define X86_XSTATE_X87_ID	0
#define X86_XSTATE_SSE_ID	1
#define X86_XSTATE_AVX_ID	2
#define X86_XSTATE_BNDREGS_ID	3
#define X86_XSTATE_BNDCFG_ID	4
#define X86_XSTATE_K_ID		5
#define X86_XSTATE_ZMM_H_ID	6
#define X86_XSTATE_ZMM_ID	7
#define X86_XSTATE_PKRU_ID	9
#define X86_XSTATE_TILECFG_ID	17
#define X86_XSTATE_TILEDATA_ID	18
#define X86_XSTATE_APX_F_ID	19

#ifdef __x86_64__
/* 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.

   NB: Is is non-zero because of the 128-byte red-zone.  Some registers
   are saved on stack without adjusting stack pointer first.  When we
   update stack pointer to allocate more space, we need to take the
   red-zone into account.  */
# define STATE_SAVE_OFFSET (8 * 7 + 8)

/* Save SSE, AVX, AVX512, mask, bound and APX registers.  Bound and APX
   registers are mutually exclusive.  */
# define STATE_SAVE_MASK		\
  ((1 << X86_XSTATE_SSE_ID)		\
   | (1 << X86_XSTATE_AVX_ID)		\
   | (1 << X86_XSTATE_BNDREGS_ID)	\
   | (1 << X86_XSTATE_K_ID)		\
   | (1 << X86_XSTATE_ZMM_H_ID) 	\
   | (1 << X86_XSTATE_ZMM_ID)		\
   | (1 << X86_XSTATE_APX_F_ID))
#else
/* Offset for fxsave/xsave area used by _dl_tlsdesc_dynamic.  Since i386
   doesn't have red-zone, use 0 here.  */
# define STATE_SAVE_OFFSET 0

/* Save SSE, AVX, AXV512, mask and bound registers.   */
# define STATE_SAVE_MASK		\
  ((1 << X86_XSTATE_SSE_ID)		\
   | (1 << X86_XSTATE_AVX_ID)		\
   | (1 << X86_XSTATE_BNDREGS_ID)	\
   | (1 << X86_XSTATE_K_ID)		\
   | (1 << X86_XSTATE_ZMM_H_ID))
#endif

/* Constants for bits in __x86_string_control:  */

/* Avoid short distance REP MOVSB.  */
#define X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB	(1 << 0)

#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;

/* Common entry 16 byte aligns.  */
#define ENTRY(name) ENTRY_P2ALIGN (name, 4)

#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 LOCAL_LABEL(name) .L##name
# define L(name)	LOCAL_LABEL(name)
#endif

#define atom_text_section .section ".text.atom", "ax"

#endif	/* __ASSEMBLER__ */

#endif	/* _X86_SYSDEP_H */