sysdeps/x86/sysdep.h

   1 /* Assembler macros for x86.
   2    Copyright (C) 2017-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _X86_SYSDEP_H
  20 #define _X86_SYSDEP_H 1
  21
  22 #include <sysdeps/generic/sysdep.h>
  23
  24 /* Offset for fxsave/xsave area used by _dl_runtime_resolve.  Also need
  25    space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX.  It must be
  26    aligned to 16 bytes for fxsave and 64 bytes for xsave.  */
  27 #define STATE_SAVE_OFFSET (8 * 7 + 8)
  28
  29 /* Save SSE, AVX, AVX512, mask and bound registers.  */
  30 #define STATE_SAVE_MASK \
  31   ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 5) | (1 << 6) | (1 << 7))
  32
  33 /* Constants for bits in __x86_string_control:  */
  34
  35 /* Avoid short distance REP MOVSB.  */
  36 #define X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB       (1 << 0)
  37
  38 #ifdef  __ASSEMBLER__
  39
  40 /* Syntactic details of assembler.  */
  41
  42 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
  43 #define ALIGNARG(log2) 1<<log2
  44 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
  45
  46 /* Common entry 16 byte aligns.  */
  47 #define ENTRY(name) ENTRY_P2ALIGN (name, 4)
  48
  49 #undef  END
  50 #define END(name)                                                             \
  51   cfi_endproc;                                                                \
  52   ASM_SIZE_DIRECTIVE(name)
  53
  54 #define ENTRY_CHK(name) ENTRY (name)
  55 #define END_CHK(name) END (name)
  56
  57 /* Since C identifiers are not normally prefixed with an underscore
  58    on this system, the asm identifier `syscall_error' intrudes on the
  59    C name space.  Make sure we use an innocuous name.  */
  60 #define syscall_error   __syscall_error
  61 #define mcount          _mcount
  62
  63 #undef  PSEUDO_END
  64 #define PSEUDO_END(name)                                                      \
  65   END (name)
  66
  67 /* Local label name for asm code. */
  68 #ifndef L
  69 /* ELF-like local names start with `.L'.  */
  70 # define LOCAL_LABEL(name) .L##name
  71 # define L(name)        LOCAL_LABEL(name)
  72 #endif
  73
  74 #define atom_text_section .section ".text.atom", "ax"
  75
  76 #endif  /* __ASSEMBLER__ */
  77
  78 #endif  /* _X86_SYSDEP_H */