sysdeps/x86/sysdep.h

   1 /* Assembler macros for x86.
   2    Copyright (C) 2017-2018 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    <http://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 #ifdef  __ASSEMBLER__
  25
  26 /* Syntactic details of assembler.  */
  27
  28 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
  29 #define ALIGNARG(log2) 1<<log2
  30 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
  31
  32 /* Define an entry point visible from C.  */
  33 #define ENTRY(name)                                                           \
  34   .globl C_SYMBOL_NAME(name);                                                 \
  35   .type C_SYMBOL_NAME(name),@function;                                        \
  36   .align ALIGNARG(4);                                                         \
  37   C_LABEL(name)                                                               \
  38   cfi_startproc;                                                              \
  39   CALL_MCOUNT
  40
  41 #undef  END
  42 #define END(name)                                                             \
  43   cfi_endproc;                                                                \
  44   ASM_SIZE_DIRECTIVE(name)
  45
  46 #define ENTRY_CHK(name) ENTRY (name)
  47 #define END_CHK(name) END (name)
  48
  49 /* Since C identifiers are not normally prefixed with an underscore
  50    on this system, the asm identifier `syscall_error' intrudes on the
  51    C name space.  Make sure we use an innocuous name.  */
  52 #define syscall_error   __syscall_error
  53 #define mcount          _mcount
  54
  55 #undef  PSEUDO_END
  56 #define PSEUDO_END(name)                                                      \
  57   END (name)
  58
  59 /* Local label name for asm code. */
  60 #ifndef L
  61 /* ELF-like local names start with `.L'.  */
  62 # define L(name)        .L##name
  63 #endif
  64
  65 #define atom_text_section .section ".text.atom", "ax"
  66
  67 #endif  /* __ASSEMBLER__ */
  68
  69 #endif  /* _X86_SYSDEP_H */