sysdeps/x86_64/sysdep.h

   1 /* Assembler macros for x86-64.
   2    Copyright (C) 2001-2018 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_64_SYSDEP_H
  20 #define _X86_64_SYSDEP_H 1
  21
  22 #include <sysdeps/x86/sysdep.h>
  23
  24 #ifdef  __ASSEMBLER__
  25
  26 /* Syntactic details of assembler.  */
  27
  28 /* This macro is for setting proper CFI with DW_CFA_expression describing
  29    the register as saved relative to %rsp instead of relative to the CFA.
  30    Expression is DW_OP_drop, DW_OP_breg7 (%rsp is register 7), sleb128 offset
  31    from %rsp.  */
  32 #define cfi_offset_rel_rsp(regn, off)   .cfi_escape 0x10, regn, 0x4, 0x13, \
  33                                         0x77, off & 0x7F | 0x80, off >> 7
  34
  35 /* If compiled for profiling, call `mcount' at the start of each function.  */
  36 #ifdef  PROF
  37 /* The mcount code relies on a normal frame pointer being on the stack
  38    to locate our caller, so push one just for its benefit.  */
  39 #define CALL_MCOUNT                                                          \
  40   pushq %rbp;                                                                \
  41   cfi_adjust_cfa_offset(8);                                                  \
  42   movq %rsp, %rbp;                                                           \
  43   cfi_def_cfa_register(%rbp);                                                \
  44   call JUMPTARGET(mcount);                                                   \
  45   popq %rbp;                                                                 \
  46   cfi_def_cfa(rsp,8);
  47 #else
  48 #define CALL_MCOUNT             /* Do nothing.  */
  49 #endif
  50
  51 #define PSEUDO(name, syscall_name, args)                                      \
  52 lose:                                                                         \
  53   jmp JUMPTARGET(syscall_error)                                               \
  54   .globl syscall_error;                                                       \
  55   ENTRY (name)                                                                \
  56   DO_CALL (syscall_name, args);                                               \
  57   jb lose
  58
  59 #undef JUMPTARGET
  60 #ifdef SHARED
  61 # ifdef BIND_NOW
  62 #  define JUMPTARGET(name)      *name##@GOTPCREL(%rip)
  63 # else
  64 #  define JUMPTARGET(name)      name##@PLT
  65 # endif
  66 #else
  67 /* For static archives, branch to target directly.  */
  68 # define JUMPTARGET(name)       name
  69 #endif
  70
  71 /* Long and pointer size in bytes.  */
  72 #define LP_SIZE 8
  73
  74 /* Instruction to operate on long and pointer.  */
  75 #define LP_OP(insn) insn##q
  76
  77 /* Assembler address directive. */
  78 #define ASM_ADDR .quad
  79
  80 /* Registers to hold long and pointer.  */
  81 #define RAX_LP  rax
  82 #define RBP_LP  rbp
  83 #define RBX_LP  rbx
  84 #define RCX_LP  rcx
  85 #define RDI_LP  rdi
  86 #define RDX_LP  rdx
  87 #define RSI_LP  rsi
  88 #define RSP_LP  rsp
  89 #define R8_LP   r8
  90 #define R9_LP   r9
  91 #define R10_LP  r10
  92 #define R11_LP  r11
  93 #define R12_LP  r12
  94 #define R13_LP  r13
  95 #define R14_LP  r14
  96 #define R15_LP  r15
  97
  98 #else   /* __ASSEMBLER__ */
  99
 100 /* Long and pointer size in bytes.  */
 101 #define LP_SIZE "8"
 102
 103 /* Instruction to operate on long and pointer.  */
 104 #define LP_OP(insn) #insn "q"
 105
 106 /* Assembler address directive. */
 107 #define ASM_ADDR ".quad"
 108
 109 /* Registers to hold long and pointer.  */
 110 #define RAX_LP  "rax"
 111 #define RBP_LP  "rbp"
 112 #define RBX_LP  "rbx"
 113 #define RCX_LP  "rcx"
 114 #define RDI_LP  "rdi"
 115 #define RDX_LP  "rdx"
 116 #define RSI_LP  "rsi"
 117 #define RSP_LP  "rsp"
 118 #define R8_LP   "r8"
 119 #define R9_LP   "r9"
 120 #define R10_LP  "r10"
 121 #define R11_LP  "r11"
 122 #define R12_LP  "r12"
 123 #define R13_LP  "r13"
 124 #define R14_LP  "r14"
 125 #define R15_LP  "r15"
 126
 127 #endif  /* __ASSEMBLER__ */
 128
 129 #endif  /* _X86_64_SYSDEP_H */