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1 /* Target definitions for GCC for Intel 80386 running System V.4
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2 Copyright (C) 1991, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
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3
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4 Written by Ron Guilmette (rfg@netcom.com).
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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
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23 #define TARGET_VERSION fprintf (stderr, " (i386 System V Release 4)");
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24
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25 /* The svr4 ABI for the i386 says that records and unions are returned
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26 in memory. */
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27
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28 #define SUBTARGET_RETURN_IN_MEMORY(TYPE, FNTYPE) \
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29 (TYPE_MODE (TYPE) == BLKmode \
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30 || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8));
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31
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32 /* Output at beginning of assembler file. */
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33 /* The .file command should always begin the output. */
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34
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35 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
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36 #undef X86_FILE_START_VERSION_DIRECTIVE
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37 #define X86_FILE_START_VERSION_DIRECTIVE true
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38
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39 #undef DBX_REGISTER_NUMBER
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40 #define DBX_REGISTER_NUMBER(n) svr4_dbx_register_map[n]
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41
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42 /* The routine used to output sequences of byte values. We use a special
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43 version of this for most svr4 targets because doing so makes the
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44 generated assembly code more compact (and thus faster to assemble)
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45 as well as more readable. Note that if we find subparts of the
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46 character sequence which end with NUL (and which are shorter than
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47 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
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48
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49 #undef ASM_OUTPUT_ASCII
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50 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
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51 do \
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52 { \
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53 const unsigned char *_ascii_bytes = \
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54 (const unsigned char *) (STR); \
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55 const unsigned char *limit = _ascii_bytes + (LENGTH); \
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56 unsigned bytes_in_chunk = 0; \
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57 for (; _ascii_bytes < limit; _ascii_bytes++) \
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58 { \
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59 const unsigned char *p; \
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60 if (bytes_in_chunk >= 64) \
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61 { \
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62 fputc ('\n', (FILE)); \
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63 bytes_in_chunk = 0; \
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64 } \
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65 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
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66 continue; \
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67 if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT) \
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68 { \
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69 if (bytes_in_chunk > 0) \
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70 { \
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71 fputc ('\n', (FILE)); \
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72 bytes_in_chunk = 0; \
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73 } \
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74 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
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75 _ascii_bytes = p; \
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76 } \
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77 else \
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78 { \
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79 if (bytes_in_chunk == 0) \
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80 fprintf ((FILE), "\t.byte\t"); \
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81 else \
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82 fputc (',', (FILE)); \
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83 fprintf ((FILE), "0x%02x", *_ascii_bytes); \
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84 bytes_in_chunk += 5; \
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85 } \
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86 } \
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87 if (bytes_in_chunk > 0) \
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88 fprintf ((FILE), "\n"); \
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89 } \
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90 while (0)
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91
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92 /* A C statement (sans semicolon) to output to the stdio stream
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93 FILE the assembler definition of uninitialized global DECL named
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94 NAME whose size is SIZE bytes and alignment is ALIGN bytes.
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95 Try to use asm_output_aligned_bss to implement this macro. */
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96
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97 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
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98 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
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99
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100 /* Handle special EH pointer encodings. Absolute, pc-relative, and
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101 indirect are handled automatically. */
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102 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
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103 do { \
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104 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \
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105 { \
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106 fputs (ASM_LONG, FILE); \
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107 assemble_name (FILE, XSTR (ADDR, 0)); \
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108 fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
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109 goto DONE; \
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110 } \
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111 } while (0)
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112
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113 /* Used by crtstuff.c to initialize the base of data-relative relocations.
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114 These are GOT relative on x86, so return the pic register. */
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115 #ifdef __PIC__
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116 #define CRT_GET_RFIB_DATA(BASE) \
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117 { \
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118 register void *ebx_ __asm__("ebx"); \
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119 BASE = ebx_; \
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120 }
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121 #else
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122 #define CRT_GET_RFIB_DATA(BASE) \
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123 __asm__ ("call\t.LPR%=\n" \
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124 ".LPR%=:\n\t" \
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125 "pop{l}\t%0\n\t" \
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126 /* Due to a GAS bug, this cannot use EAX. That encodes \
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127 smaller than the traditional EBX, which results in the \
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128 offset being off by one. */ \
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129 "add{l}\t{$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \
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130 "|%0,_GLOBAL_OFFSET_TABLE_+(.-.LPR%=)}" \
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131 : "=d"(BASE))
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132 #endif
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