src/system/libroot/posix/glibc/include/arch/x86_64/sysdep.h

   1 /* Assembler macros for x86-64.
   2    Copyright (C) 2001, 2002, 2003 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include_next <sysdep.h>
  21
  22 #ifdef  __ASSEMBLER__
  23
  24 /* Syntactic details of assembler.  */
  25
  26 #define cfi_startproc         .cfi_startproc
  27 #define cfi_endproc           .cfi_endproc
  28 #define cfi_def_cfa(reg, off)     .cfi_def_cfa reg, off
  29 #define cfi_def_cfa_register(reg) .cfi_def_cfa_register reg
  30 #define cfi_def_cfa_offset(off)   .cfi_def_cfa_offset off
  31 #define cfi_adjust_cfa_offset(off)    .cfi_adjust_cfa_offset off
  32 #define cfi_offset(reg, off)      .cfi_offset reg, off
  33 #define cfi_rel_offset(reg, off)  .cfi_rel_offset reg, off
  34 #define cfi_register(r1, r2)      .cfi_register r1, r2
  35 #define cfi_return_column(reg)    .cfi_return_column reg
  36 #define cfi_restore(reg)      .cfi_restore reg
  37 #define cfi_same_value(reg)       .cfi_same_value reg
  38 #define cfi_undefined(reg)        .cfi_undefined reg
  39 #define cfi_remember_state        .cfi_remember_state
  40 #define cfi_restore_state     .cfi_restore_state
  41 #define cfi_window_save       .cfi_window_save
  42
  43 #ifdef HAVE_ELF
  44
  45 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
  46 #define ALIGNARG(log2) 1<<log2
  47 /* For ELF we need the `.type' directive to make shared libs work right.  */
  48 #define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
  49 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
  50
  51 /* In ELF C symbols are asm symbols.  */
  52 #undef  NO_UNDERSCORES
  53 #define NO_UNDERSCORES
  54
  55 #else
  56
  57 #define ALIGNARG(log2) log2
  58 #define ASM_TYPE_DIRECTIVE(name,type)   /* Nothing is specified.  */
  59 #define ASM_SIZE_DIRECTIVE(name)        /* Nothing is specified.  */
  60
  61 #endif
  62
  63
  64 /* Define an entry point visible from C.  */
  65 #define ENTRY(name)                                                           \
  66   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  67   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  68   .align ALIGNARG(4);                                                         \
  69   C_LABEL(name)                                                               \
  70   cfi_startproc;                                                              \
  71   CALL_MCOUNT
  72
  73 #undef  END
  74 #define END(name)                                                             \
  75   cfi_endproc;                                                                \
  76   ASM_SIZE_DIRECTIVE(name)
  77
  78 /* If compiled for profiling, call `mcount' at the start of each function.  */
  79 #ifdef  PROF
  80 /* The mcount code relies on a normal frame pointer being on the stack
  81    to locate our caller, so push one just for its benefit.  */
  82 #define CALL_MCOUNT                                                          \
  83   pushq %rbp;                                                                \
  84   cfi_adjust_cfa_offset(8);                                                  \
  85   movq %rsp, %rbp;                                                           \
  86   cfi_def_cfa_register(%rbp);                                                \
  87   call JUMPTARGET(mcount);                                                   \
  88   popq %rbp;                                                                 \
  89   cfi_def_cfa(rsp,8);
  90 #else
  91 #define CALL_MCOUNT             /* Do nothing.  */
  92 #endif
  93
  94 #ifdef  NO_UNDERSCORES
  95 /* Since C identifiers are not normally prefixed with an underscore
  96    on this system, the asm identifier `syscall_error' intrudes on the
  97    C name space.  Make sure we use an innocuous name.  */
  98 #define syscall_error   __syscall_error
  99 #define mcount          _mcount
 100 #endif
 101
 102 #define PSEUDO(name, syscall_name, args)                                      \
 103 lose:                                                                         \
 104   jmp JUMPTARGET(syscall_error)                                               \
 105   .globl syscall_error;                                                       \
 106   ENTRY (name)                                                                \
 107   DO_CALL (syscall_name, args);                                               \
 108   jb lose
 109
 110 #undef  PSEUDO_END
 111 #define PSEUDO_END(name)                                                      \
 112   END (name)
 113
 114 #undef JUMPTARGET
 115 #ifdef PIC
 116 #define JUMPTARGET(name)        name##@PLT
 117 #else
 118 #define JUMPTARGET(name)        name
 119 #endif
 120
 121 /* Local label name for asm code. */
 122 #ifndef L
 123 # ifdef HAVE_ELF
 124 /* ELF-like local names start with `.L'.  */
 125 #  define L(name)       .L##name
 126 # else
 127 #  define L(name)       name
 128 # endif
 129 #endif
 130
 131 #endif  /* __ASSEMBLER__ */