sysdeps/x86_64/sysdep.h

   1 /* Assembler macros for x86-64.
   2    Copyright (C) 2001-2014 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_64_SYSDEP_H
  20 #define _X86_64_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
  33 /* Define an entry point visible from C.  */
  34 #define ENTRY(name)                                                           \
  35   .globl C_SYMBOL_NAME(name);                                                 \
  36   .type C_SYMBOL_NAME(name),@function;                                        \
  37   .align ALIGNARG(4);                                                         \
  38   C_LABEL(name)                                                               \
  39   cfi_startproc;                                                              \
  40   CALL_MCOUNT
  41
  42 #undef  END
  43 #define END(name)                                                             \
  44   cfi_endproc;                                                                \
  45   ASM_SIZE_DIRECTIVE(name)
  46
  47 #define ENTRY_CHK(name) ENTRY (name)
  48 #define END_CHK(name) END (name)
  49
  50 /* If compiled for profiling, call `mcount' at the start of each function.  */
  51 #ifdef  PROF
  52 /* The mcount code relies on a normal frame pointer being on the stack
  53    to locate our caller, so push one just for its benefit.  */
  54 #define CALL_MCOUNT                                                          \
  55   pushq %rbp;                                                                \
  56   cfi_adjust_cfa_offset(8);                                                  \
  57   movq %rsp, %rbp;                                                           \
  58   cfi_def_cfa_register(%rbp);                                                \
  59   call JUMPTARGET(mcount);                                                   \
  60   popq %rbp;                                                                 \
  61   cfi_def_cfa(rsp,8);
  62 #else
  63 #define CALL_MCOUNT             /* Do nothing.  */
  64 #endif
  65
  66 /* Since C identifiers are not normally prefixed with an underscore
  67    on this system, the asm identifier `syscall_error' intrudes on the
  68    C name space.  Make sure we use an innocuous name.  */
  69 #define syscall_error   __syscall_error
  70 #define mcount          _mcount
  71
  72 #define PSEUDO(name, syscall_name, args)                                      \
  73 lose:                                                                         \
  74   jmp JUMPTARGET(syscall_error)                                               \
  75   .globl syscall_error;                                                       \
  76   ENTRY (name)                                                                \
  77   DO_CALL (syscall_name, args);                                               \
  78   jb lose
  79
  80 #undef  PSEUDO_END
  81 #define PSEUDO_END(name)                                                      \
  82   END (name)
  83
  84 #undef JUMPTARGET
  85 #ifdef PIC
  86 #define JUMPTARGET(name)        name##@PLT
  87 #else
  88 #define JUMPTARGET(name)        name
  89 #endif
  90
  91 /* Local label name for asm code. */
  92 #ifndef L
  93 /* ELF-like local names start with `.L'.  */
  94 # define L(name)        .L##name
  95 #endif
  96
  97 #define atom_text_section .section ".text.atom", "ax"
  98
  99 /* Long and pointer size in bytes.  */
 100 #define LP_SIZE 8
 101
 102 /* Instruction to operate on long and pointer.  */
 103 #define LP_OP(insn) insn##q
 104
 105 /* Assembler address directive. */
 106 #define ASM_ADDR .quad
 107
 108 /* Registers to hold long and pointer.  */
 109 #define RAX_LP  rax
 110 #define RBP_LP  rbp
 111 #define RBX_LP  rbx
 112 #define RCX_LP  rcx
 113 #define RDI_LP  rdi
 114 #define RDX_LP  rdx
 115 #define RSI_LP  rsi
 116 #define RSP_LP  rsp
 117 #define R8_LP   r8
 118 #define R9_LP   r9
 119 #define R10_LP  r10
 120 #define R11_LP  r11
 121 #define R12_LP  r12
 122 #define R13_LP  r13
 123 #define R14_LP  r14
 124 #define R15_LP  r15
 125
 126 #else   /* __ASSEMBLER__ */
 127
 128 /* Long and pointer size in bytes.  */
 129 #define LP_SIZE "8"
 130
 131 /* Instruction to operate on long and pointer.  */
 132 #define LP_OP(insn) #insn "q"
 133
 134 /* Assembler address directive. */
 135 #define ASM_ADDR ".quad"
 136
 137 /* Registers to hold long and pointer.  */
 138 #define RAX_LP  "rax"
 139 #define RBP_LP  "rbp"
 140 #define RBX_LP  "rbx"
 141 #define RCX_LP  "rcx"
 142 #define RDI_LP  "rdi"
 143 #define RDX_LP  "rdx"
 144 #define RSI_LP  "rsi"
 145 #define RSP_LP  "rsp"
 146 #define R8_LP   "r8"
 147 #define R9_LP   "r9"
 148 #define R10_LP  "r10"
 149 #define R11_LP  "r11"
 150 #define R12_LP  "r12"
 151 #define R13_LP  "r13"
 152 #define R14_LP  "r14"
 153 #define R15_LP  "r15"
 154
 155 #endif  /* __ASSEMBLER__ */
 156
 157 #endif  /* _X86_64_SYSDEP_H */