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111
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1 /* Definitions for Intel 386 systems using GNU userspace.
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145
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2 Copyright (C) 1994-2020 Free Software Foundation, Inc.
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3 Contributed by Eric Youngdale.
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4 Modified for stabs-in-ELF by H.J. Lu.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3, or (at your option)
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11 any later version.
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12
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13 GCC is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 /* Output at beginning of assembler file. */
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23 /* The .file command should always begin the output. */
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24 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
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25
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26 #undef ASM_COMMENT_START
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27 #define ASM_COMMENT_START "#"
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28
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29 #undef DBX_REGISTER_NUMBER
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30 #define DBX_REGISTER_NUMBER(n) \
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31 (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
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32
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33 /* Output assembler code to FILE to call the profiler.
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34 To the best of my knowledge, no GNU userspace libc has required the label
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35 argument to mcount. */
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36
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37 #define NO_PROFILE_COUNTERS 1
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38
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39 #undef MCOUNT_NAME
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40 #define MCOUNT_NAME "mcount"
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41
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42 /* The GLIBC version of mcount for the x86 assumes that there is a
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43 frame, so we cannot allow profiling without a frame pointer. */
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44
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45 #undef SUBTARGET_FRAME_POINTER_REQUIRED
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46 #define SUBTARGET_FRAME_POINTER_REQUIRED crtl->profile
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47
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48 #undef SIZE_TYPE
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49 #define SIZE_TYPE "unsigned int"
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50
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51 #undef PTRDIFF_TYPE
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52 #define PTRDIFF_TYPE "int"
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53
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54 #undef WCHAR_TYPE
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55 #define WCHAR_TYPE "long int"
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56
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57 #undef WCHAR_TYPE_SIZE
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58 #define WCHAR_TYPE_SIZE BITS_PER_WORD
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59
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60 /* Provide a LINK_SPEC appropriate for GNU userspace. Here we provide support
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61 for the special GCC options -static and -shared, which allow us to
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62 link things in one of these three modes by applying the appropriate
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63 combinations of options at link-time.
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64
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65 When the -shared link option is used a final link is not being
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66 done. */
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67
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68 #undef ASM_SPEC
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69 #define ASM_SPEC \
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70 "--32 %{msse2avx:%{!mavx:-msse2avx}}"
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111
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71
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72 #undef SUBTARGET_EXTRA_SPECS
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73 #define SUBTARGET_EXTRA_SPECS \
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74 { "link_emulation", GNU_USER_LINK_EMULATION },\
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75 { "dynamic_linker", GNU_USER_DYNAMIC_LINKER }
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76
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77 #define GNU_USER_TARGET_LINK_SPEC "-m %(link_emulation) %{shared:-shared} \
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78 %{!shared: \
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79 %{!static: \
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80 %{!static-pie: \
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81 %{rdynamic:-export-dynamic} \
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82 -dynamic-linker %(dynamic_linker)}} \
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83 %{static:-static} %{static-pie:-static -pie --no-dynamic-linker -z text}}"
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84
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85 #undef LINK_SPEC
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86 #define LINK_SPEC GNU_USER_TARGET_LINK_SPEC
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87
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88 /* A C statement (sans semicolon) to output to the stdio stream
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89 FILE the assembler definition of uninitialized global DECL named
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90 NAME whose size is SIZE bytes and alignment is ALIGN bytes.
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91 Try to use asm_output_aligned_bss to implement this macro. */
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92
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93 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
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94 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
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95
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96 /* A C statement to output to the stdio stream FILE an assembler
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97 command to advance the location counter to a multiple of 1<<LOG
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98 bytes if it is within MAX_SKIP bytes. */
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99
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131
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100 #define SUBALIGN_LOG 3
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111
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101
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102 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
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103 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
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104 do { \
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105 if ((LOG) != 0) { \
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131
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106 if ((MAX_SKIP) == 0 || (MAX_SKIP) >= (1 << (LOG)) - 1) \
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107 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
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108 else \
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111
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109 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
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110 } \
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111 } while (0)
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112 #endif
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113
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114 /* Handle special EH pointer encodings. Absolute, pc-relative, and
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115 indirect are handled automatically. */
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116 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
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117 do { \
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118 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \
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119 { \
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120 fputs (ASM_LONG, FILE); \
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121 assemble_name (FILE, XSTR (ADDR, 0)); \
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122 fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
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123 goto DONE; \
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124 } \
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125 } while (0)
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126
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127 #ifdef TARGET_LIBC_PROVIDES_SSP
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128 /* i386 glibc provides __stack_chk_guard in %gs:0x14. */
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129 #define TARGET_THREAD_SSP_OFFSET 0x14
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130
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131
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131 /* i386 glibc provides __private_ss in %gs:0x30. */
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132 #define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30
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133 #endif
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