gcc-4_9/gcc/config/i386/gnu-user.h

   1 /* Definitions for Intel 386 systems using GNU userspace.
   2    Copyright (C) 1994-2014 Free Software Foundation, Inc.
   3    Contributed by Eric Youngdale.
   4    Modified for stabs-in-ELF by H.J. Lu.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 /* Output at beginning of assembler file.  */
  23 /* The .file command should always begin the output.  */
  24 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
  25
  26 #undef ASM_COMMENT_START
  27 #define ASM_COMMENT_START "#"
  28
  29 #undef DBX_REGISTER_NUMBER
  30 #define DBX_REGISTER_NUMBER(n) \
  31   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
  32
  33 /* Output assembler code to FILE to call the profiler.
  34    To the best of my knowledge, no GNU userspace libc has required the label
  35    argument to mcount.  */
  36
  37 #define NO_PROFILE_COUNTERS     1
  38
  39 #undef MCOUNT_NAME
  40 #define MCOUNT_NAME "mcount"
  41
  42 /* The GLIBC version of mcount for the x86 assumes that there is a
  43    frame, so we cannot allow profiling without a frame pointer.  */
  44
  45 #undef SUBTARGET_FRAME_POINTER_REQUIRED
  46 #define SUBTARGET_FRAME_POINTER_REQUIRED crtl->profile
  47
  48 #undef SIZE_TYPE
  49 #define SIZE_TYPE "unsigned int"
  50
  51 #undef PTRDIFF_TYPE
  52 #define PTRDIFF_TYPE "int"
  53
  54 #undef WCHAR_TYPE
  55 #define WCHAR_TYPE "long int"
  56
  57 #undef WCHAR_TYPE_SIZE
  58 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  59
  60 /* Provide a LINK_SPEC appropriate for GNU userspace.  Here we provide support
  61    for the special GCC options -static and -shared, which allow us to
  62    link things in one of these three modes by applying the appropriate
  63    combinations of options at link-time.
  64
  65    When the -shared link option is used a final link is not being
  66    done.  */
  67
  68 #undef ANDROID_TARGET_CC1_SPEC
  69 #define ANDROID_TARGET_CC1_SPEC \
  70   " -mssse3 -fno-short-enums " \
  71
  72 #undef  ASM_SPEC
  73 #define ASM_SPEC \
  74   "--32 %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}} " \
  75   LINUX_OR_ANDROID_CC ("", ANDROID_ASM_SPEC)
  76
  77 #undef  SUBTARGET_EXTRA_SPECS_STR
  78 #define SUBTARGET_EXTRA_SPECS_STR \
  79   { "link_emulation", GNU_USER_LINK_EMULATION },\
  80   { "dynamic_linker", GNU_USER_DYNAMIC_LINKER }
  81 #undef  SUBTARGET_EXTRA_SPECS
  82 #define SUBTARGET_EXTRA_SPECS SUBTARGET_EXTRA_SPECS_STR
  83
  84 #define GNU_USER_TARGET_LINK_SPEC "-m %(link_emulation) %{shared:-shared} \
  85   %{!shared: \
  86     %{!static: \
  87       %{rdynamic:-export-dynamic} \
  88       -dynamic-linker %(dynamic_linker)} \
  89       %{static:-static}}"
  90
  91 #undef  LINK_SPEC
  92 #define LINK_SPEC GNU_USER_TARGET_LINK_SPEC
  93
  94 /* A C statement (sans semicolon) to output to the stdio stream
  95    FILE the assembler definition of uninitialized global DECL named
  96    NAME whose size is SIZE bytes and alignment is ALIGN bytes.
  97    Try to use asm_output_aligned_bss to implement this macro.  */
  98
  99 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 100   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 101
 102 /* A C statement to output to the stdio stream FILE an assembler
 103    command to advance the location counter to a multiple of 1<<LOG
 104    bytes if it is within MAX_SKIP bytes.
 105
 106    This is used to align code labels according to Intel recommendations.  */
 107
 108 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 109 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)                    \
 110   do {                                                                  \
 111     if ((LOG) != 0) {                                                   \
 112       if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG));  \
 113       else {                                                            \
 114         fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));     \
 115         /* Make sure that we have at least 8 byte alignment if > 8 byte \
 116            alignment is preferred.  */                                  \
 117         if ((LOG) > 3                                                   \
 118             && (1 << (LOG)) > ((MAX_SKIP) + 1)                          \
 119             && (MAX_SKIP) >= 7)                                         \
 120           fputs ("\t.p2align 3\n", (FILE));                             \
 121       }                                                                 \
 122     }                                                                   \
 123   } while (0)
 124 #endif
 125
 126 /* Handle special EH pointer encodings.  Absolute, pc-relative, and
 127    indirect are handled automatically.  */
 128 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
 129   do {                                                                  \
 130     if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel)         \
 131       {                                                                 \
 132         fputs (ASM_LONG, FILE);                 \
 133         assemble_name (FILE, XSTR (ADDR, 0));                           \
 134         fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
 135         goto DONE;                                                      \
 136       }                                                                 \
 137   } while (0)
 138
 139 /* Used by crtstuff.c to initialize the base of data-relative relocations.
 140    These are GOT relative on x86, so return the pic register.  */
 141 #ifdef __PIC__
 142 #define CRT_GET_RFIB_DATA(BASE)                 \
 143   {                                             \
 144     register void *ebx_ __asm__("ebx");         \
 145     BASE = ebx_;                                \
 146   }
 147 #else
 148 #define CRT_GET_RFIB_DATA(BASE)                                         \
 149   __asm__ ("call\t.LPR%=\n"                                             \
 150            ".LPR%=:\n\t"                                                \
 151            "pop{l}\t%0\n\t"                                             \
 152            /* Due to a GAS bug, this cannot use EAX.  That encodes      \
 153               smaller than the traditional EBX, which results in the    \
 154               offset being off by one.  */                              \
 155            "add{l}\t{$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0"              \
 156                    "|%0,_GLOBAL_OFFSET_TABLE_+(.-.LPR%=)}"              \
 157            : "=d"(BASE))
 158 #endif
 159
 160 #ifdef TARGET_LIBC_PROVIDES_SSP
 161 /* i386 glibc provides __stack_chk_guard in %gs:0x14.  */
 162 #define TARGET_THREAD_SSP_OFFSET        0x14
 163
 164 /* We only build the -fsplit-stack support in libgcc if the
 165    assembler has full support for the CFI directives.  */
 166 #if HAVE_GAS_CFI_PERSONALITY_DIRECTIVE
 167 #define TARGET_CAN_SPLIT_STACK
 168 #endif
 169 /* We steal the last transactional memory word.  */
 170 #define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30
 171 #endif