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5191 | serge | 1 | /* Generic ECOFF support. |
2 | This does not include symbol information, found in sym.h and |
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3 | symconst.h. |
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4 | |||
6324 | serge | 5 | Copyright (C) 2001-2015 Free Software Foundation, Inc. |
5191 | serge | 6 | |
7 | This program is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 3 of the License, or |
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10 | (at your option) any later version. |
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11 | |||
12 | This program is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |||
17 | You should have received a copy of the GNU General Public License |
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18 | along with this program; if not, write to the Free Software |
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19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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20 | MA 02110-1301, USA. */ |
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21 | |||
22 | #ifndef ECOFF_H |
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23 | #define ECOFF_H |
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24 | |||
25 | /* Mips magic numbers used in filehdr. MIPS_MAGIC_LITTLE is used on |
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26 | little endian machines. MIPS_MAGIC_BIG is used on big endian |
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27 | machines. Where is MIPS_MAGIC_1 from? */ |
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28 | #define MIPS_MAGIC_1 0x0180 |
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29 | #define MIPS_MAGIC_LITTLE 0x0162 |
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30 | #define MIPS_MAGIC_BIG 0x0160 |
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31 | |||
32 | /* These are the magic numbers used for MIPS code compiled at ISA |
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33 | level 2. */ |
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34 | #define MIPS_MAGIC_LITTLE2 0x0166 |
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35 | #define MIPS_MAGIC_BIG2 0x0163 |
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36 | |||
37 | /* These are the magic numbers used for MIPS code compiled at ISA |
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38 | level 3. */ |
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39 | #define MIPS_MAGIC_LITTLE3 0x142 |
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40 | #define MIPS_MAGIC_BIG3 0x140 |
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41 | |||
42 | /* Alpha magic numbers used in filehdr. */ |
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43 | #define ALPHA_MAGIC 0x183 |
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44 | #define ALPHA_MAGIC_BSD 0x185 |
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45 | /* A compressed version of an ALPHA_MAGIC file created by DEC's tools. */ |
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46 | #define ALPHA_MAGIC_COMPRESSED 0x188 |
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47 | |||
48 | /* Magic numbers used in a.out header. */ |
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49 | #define ECOFF_AOUT_OMAGIC 0407 /* not demand paged (ld -N). */ |
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50 | #define ECOFF_AOUT_ZMAGIC 0413 /* demand load format, eg normal ld output */ |
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51 | |||
52 | /* Names of special sections. */ |
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53 | #define _TEXT ".text" |
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54 | #define _DATA ".data" |
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55 | #define _BSS ".bss" |
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56 | #define _RDATA ".rdata" |
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57 | #define _SDATA ".sdata" |
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58 | #define _SBSS ".sbss" |
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59 | #define _LITA ".lita" |
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60 | #define _LIT4 ".lit4" |
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61 | #define _LIT8 ".lit8" |
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62 | #define _LIB ".lib" |
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63 | #define _INIT ".init" |
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64 | #define _FINI ".fini" |
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65 | #define _PDATA ".pdata" |
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66 | #define _XDATA ".xdata" |
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67 | #define _GOT ".got" |
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68 | #define _HASH ".hash" |
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69 | #define _DYNSYM ".dynsym" |
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70 | #define _DYNSTR ".dynstr" |
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71 | #define _RELDYN ".rel.dyn" |
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72 | #define _CONFLIC ".conflic" |
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73 | #define _COMMENT ".comment" |
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74 | #define _LIBLIST ".liblist" |
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75 | #define _DYNAMIC ".dynamic" |
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76 | #define _RCONST ".rconst" |
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77 | |||
78 | /* ECOFF uses some additional section flags. */ |
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79 | #define STYP_RDATA 0x100 |
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80 | #define STYP_SDATA 0x200 |
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81 | #define STYP_SBSS 0x400 |
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82 | #define STYP_GOT 0x1000 |
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83 | #define STYP_DYNAMIC 0x2000 |
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84 | #define STYP_DYNSYM 0x4000 |
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85 | #define STYP_RELDYN 0x8000 |
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86 | #define STYP_DYNSTR 0x10000 |
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87 | #define STYP_HASH 0x20000 |
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88 | #define STYP_LIBLIST 0x40000 |
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89 | #define STYP_CONFLIC 0x100000 |
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90 | #define STYP_ECOFF_FINI 0x1000000 |
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91 | #define STYP_EXTENDESC 0x2000000 /* 0x02FFF000 bits => scn type, rest clr */ |
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92 | #define STYP_LITA 0x4000000 |
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93 | #define STYP_LIT8 0x8000000 |
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94 | #define STYP_LIT4 0x10000000 |
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95 | #define STYP_ECOFF_LIB 0x40000000 |
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96 | #define STYP_ECOFF_INIT 0x80000000 |
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97 | #define STYP_OTHER_LOAD (STYP_ECOFF_INIT | STYP_ECOFF_FINI) |
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98 | |||
99 | /* extended section types */ |
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100 | #define STYP_COMMENT 0x2100000 |
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101 | #define STYP_RCONST 0x2200000 |
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102 | #define STYP_XDATA 0x2400000 |
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103 | #define STYP_PDATA 0x2800000 |
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104 | |||
105 | /* The linker needs a section to hold small common variables while |
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106 | linking. There is no convenient way to create it when the linker |
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107 | needs it, so we always create one for each BFD. We then avoid |
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108 | writing it out. */ |
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109 | #define SCOMMON ".scommon" |
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110 | |||
111 | /* If the extern bit in a reloc is 1, then r_symndx is an index into |
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112 | the external symbol table. If the extern bit is 0, then r_symndx |
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113 | indicates a section, and is one of the following values. */ |
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114 | #define RELOC_SECTION_NONE 0 |
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115 | #define RELOC_SECTION_TEXT 1 |
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116 | #define RELOC_SECTION_RDATA 2 |
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117 | #define RELOC_SECTION_DATA 3 |
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118 | #define RELOC_SECTION_SDATA 4 |
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119 | #define RELOC_SECTION_SBSS 5 |
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120 | #define RELOC_SECTION_BSS 6 |
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121 | #define RELOC_SECTION_INIT 7 |
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122 | #define RELOC_SECTION_LIT8 8 |
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123 | #define RELOC_SECTION_LIT4 9 |
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124 | #define RELOC_SECTION_XDATA 10 |
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125 | #define RELOC_SECTION_PDATA 11 |
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126 | #define RELOC_SECTION_FINI 12 |
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127 | #define RELOC_SECTION_LITA 13 |
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128 | #define RELOC_SECTION_ABS 14 |
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129 | #define RELOC_SECTION_RCONST 15 |
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130 | |||
131 | #define NUM_RELOC_SECTIONS 16 |
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132 | |||
133 | /********************** STABS **********************/ |
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134 | |||
135 | /* gcc uses mips-tfile to output type information in special stabs |
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136 | entries. These must match the corresponding definition in |
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137 | gcc/config/mips.h. At some point, these should probably go into a |
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138 | shared include file, but currently gcc and gdb do not share any |
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139 | directories. */ |
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140 | #define CODE_MASK 0x8F300 |
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141 | #define ECOFF_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK) |
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142 | #define ECOFF_MARK_STAB(code) ((code)+CODE_MASK) |
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143 | #define ECOFF_UNMARK_STAB(code) ((code)-CODE_MASK) |
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144 | #define STABS_SYMBOL "@stabs" |
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145 | |||
146 | /********************** COFF **********************/ |
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147 | |||
148 | /* gcc also uses mips-tfile to output COFF debugging information. |
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149 | These are the values it uses when outputting the .type directive. |
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150 | These should also be in a shared include file. */ |
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151 | #define N_BTMASK (017) |
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152 | #define N_TMASK (060) |
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153 | #define N_BTSHFT (4) |
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154 | #define N_TSHIFT (2) |
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155 | |||
156 | /********************** AUX **********************/ |
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157 | |||
158 | /* The auxiliary type information is the same on all known ECOFF |
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159 | targets. I can't see any reason that it would ever change, so I am |
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160 | going to gamble and define the external structures here, in the |
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161 | target independent ECOFF header file. The internal forms are |
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162 | defined in coff/sym.h, which was originally donated by MIPS |
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163 | Computer Systems. */ |
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164 | |||
165 | /* Type information external record */ |
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166 | |||
167 | struct tir_ext { |
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168 | unsigned char t_bits1[1]; |
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169 | unsigned char t_tq45[1]; |
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170 | unsigned char t_tq01[1]; |
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171 | unsigned char t_tq23[1]; |
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172 | }; |
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173 | |||
174 | #define TIR_BITS1_FBITFIELD_BIG ((unsigned int) 0x80) |
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175 | #define TIR_BITS1_FBITFIELD_LITTLE ((unsigned int) 0x01) |
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176 | |||
177 | #define TIR_BITS1_CONTINUED_BIG ((unsigned int) 0x40) |
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178 | #define TIR_BITS1_CONTINUED_LITTLE ((unsigned int) 0x02) |
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179 | |||
180 | #define TIR_BITS1_BT_BIG ((unsigned int) 0x3F) |
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181 | #define TIR_BITS1_BT_SH_BIG 0 |
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182 | #define TIR_BITS1_BT_LITTLE ((unsigned int) 0xFC) |
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183 | #define TIR_BITS1_BT_SH_LITTLE 2 |
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184 | |||
185 | #define TIR_BITS_TQ4_BIG ((unsigned int) 0xF0) |
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186 | #define TIR_BITS_TQ4_SH_BIG 4 |
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187 | #define TIR_BITS_TQ5_BIG ((unsigned int) 0x0F) |
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188 | #define TIR_BITS_TQ5_SH_BIG 0 |
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189 | #define TIR_BITS_TQ4_LITTLE ((unsigned int) 0x0F) |
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190 | #define TIR_BITS_TQ4_SH_LITTLE 0 |
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191 | #define TIR_BITS_TQ5_LITTLE ((unsigned int) 0xF0) |
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192 | #define TIR_BITS_TQ5_SH_LITTLE 4 |
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193 | |||
194 | #define TIR_BITS_TQ0_BIG ((unsigned int) 0xF0) |
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195 | #define TIR_BITS_TQ0_SH_BIG 4 |
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196 | #define TIR_BITS_TQ1_BIG ((unsigned int) 0x0F) |
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197 | #define TIR_BITS_TQ1_SH_BIG 0 |
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198 | #define TIR_BITS_TQ0_LITTLE ((unsigned int) 0x0F) |
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199 | #define TIR_BITS_TQ0_SH_LITTLE 0 |
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200 | #define TIR_BITS_TQ1_LITTLE ((unsigned int) 0xF0) |
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201 | #define TIR_BITS_TQ1_SH_LITTLE 4 |
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202 | |||
203 | #define TIR_BITS_TQ2_BIG ((unsigned int) 0xF0) |
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204 | #define TIR_BITS_TQ2_SH_BIG 4 |
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205 | #define TIR_BITS_TQ3_BIG ((unsigned int) 0x0F) |
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206 | #define TIR_BITS_TQ3_SH_BIG 0 |
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207 | #define TIR_BITS_TQ2_LITTLE ((unsigned int) 0x0F) |
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208 | #define TIR_BITS_TQ2_SH_LITTLE 0 |
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209 | #define TIR_BITS_TQ3_LITTLE ((unsigned int) 0xF0) |
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210 | #define TIR_BITS_TQ3_SH_LITTLE 4 |
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211 | |||
212 | /* Relative symbol external record */ |
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213 | |||
214 | struct rndx_ext { |
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215 | unsigned char r_bits[4]; |
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216 | }; |
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217 | |||
218 | #define RNDX_BITS0_RFD_SH_LEFT_BIG 4 |
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219 | #define RNDX_BITS1_RFD_BIG ((unsigned int) 0xF0) |
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220 | #define RNDX_BITS1_RFD_SH_BIG 4 |
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221 | |||
222 | #define RNDX_BITS0_RFD_SH_LEFT_LITTLE 0 |
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223 | #define RNDX_BITS1_RFD_LITTLE ((unsigned int) 0x0F) |
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224 | #define RNDX_BITS1_RFD_SH_LEFT_LITTLE 8 |
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225 | |||
226 | #define RNDX_BITS1_INDEX_BIG ((unsigned int) 0x0F) |
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227 | #define RNDX_BITS1_INDEX_SH_LEFT_BIG 16 |
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228 | #define RNDX_BITS2_INDEX_SH_LEFT_BIG 8 |
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229 | #define RNDX_BITS3_INDEX_SH_LEFT_BIG 0 |
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230 | |||
231 | #define RNDX_BITS1_INDEX_LITTLE ((unsigned int) 0xF0) |
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232 | #define RNDX_BITS1_INDEX_SH_LITTLE 4 |
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233 | #define RNDX_BITS2_INDEX_SH_LEFT_LITTLE 4 |
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234 | #define RNDX_BITS3_INDEX_SH_LEFT_LITTLE 12 |
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235 | |||
236 | /* Auxiliary symbol information external record */ |
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237 | |||
238 | union aux_ext { |
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239 | struct tir_ext a_ti; |
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240 | struct rndx_ext a_rndx; |
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241 | unsigned char a_dnLow[4]; |
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242 | unsigned char a_dnHigh[4]; |
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243 | unsigned char a_isym[4]; |
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244 | unsigned char a_iss[4]; |
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245 | unsigned char a_width[4]; |
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246 | unsigned char a_count[4]; |
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247 | }; |
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248 | |||
249 | #define AUX_GET_ANY(bigend, ax, field) \ |
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250 | ((bigend) ? bfd_getb32 ((ax)->field) : bfd_getl32 ((ax)->field)) |
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251 | |||
252 | #define AUX_GET_DNLOW(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_dnLow) |
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253 | #define AUX_GET_DNHIGH(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_dnHigh) |
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254 | #define AUX_GET_ISYM(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_isym) |
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255 | #define AUX_GET_ISS(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_iss) |
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256 | #define AUX_GET_WIDTH(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_width) |
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257 | #define AUX_GET_COUNT(bigend, ax) AUX_GET_ANY ((bigend), (ax), a_count) |
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258 | |||
259 | #define AUX_PUT_ANY(bigend, val, ax, field) \ |
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260 | ((bigend) \ |
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261 | ? (bfd_putb32 ((bfd_vma) (val), (ax)->field), 0) \ |
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262 | : (bfd_putl32 ((bfd_vma) (val), (ax)->field), 0)) |
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263 | |||
264 | #define AUX_PUT_DNLOW(bigend, val, ax) \ |
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265 | AUX_PUT_ANY ((bigend), (val), (ax), a_dnLow) |
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266 | #define AUX_PUT_DNHIGH(bigend, val, ax) \ |
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267 | AUX_PUT_ANY ((bigend), (val), (ax), a_dnHigh) |
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268 | #define AUX_PUT_ISYM(bigend, val, ax) \ |
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269 | AUX_PUT_ANY ((bigend), (val), (ax), a_isym) |
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270 | #define AUX_PUT_ISS(bigend, val, ax) \ |
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271 | AUX_PUT_ANY ((bigend), (val), (ax), a_iss) |
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272 | #define AUX_PUT_WIDTH(bigend, val, ax) \ |
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273 | AUX_PUT_ANY ((bigend), (val), (ax), a_width) |
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274 | #define AUX_PUT_COUNT(bigend, val, ax) \ |
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275 | AUX_PUT_ANY ((bigend), (val), (ax), a_count) |
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276 | |||
277 | /********************** SYMBOLS **********************/ |
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278 | |||
279 | /* For efficiency, gdb deals directly with the unswapped symbolic |
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280 | information (that way it only takes the time to swap information |
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281 | that it really needs to read). gdb originally retrieved the |
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282 | information directly from the BFD backend information, but that |
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283 | strategy, besides being sort of ugly, does not work for MIPS ELF, |
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284 | which also uses ECOFF debugging information. This structure holds |
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285 | pointers to the (mostly) unswapped symbolic information. */ |
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286 | |||
287 | struct ecoff_debug_info |
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288 | { |
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289 | /* The swapped ECOFF symbolic header. */ |
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290 | HDRR symbolic_header; |
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291 | |||
292 | /* Pointers to the unswapped symbolic information. Note that the |
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293 | pointers to external structures point to different sorts of |
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294 | information on different ECOFF targets. The ecoff_debug_swap |
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295 | structure provides the sizes of the structures and the functions |
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296 | needed to swap the information in and out. These pointers are |
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297 | all pointers to arrays, not single structures. They will be NULL |
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298 | if there are no instances of the relevant structure. These |
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299 | fields are also used by the assembler to output ECOFF debugging |
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300 | information. */ |
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301 | unsigned char *line; |
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302 | void *external_dnr; /* struct dnr_ext */ |
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303 | void *external_pdr; /* struct pdr_ext */ |
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304 | void *external_sym; /* struct sym_ext */ |
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305 | void *external_opt; /* struct opt_ext */ |
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306 | union aux_ext *external_aux; |
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307 | char *ss; |
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308 | char *ssext; |
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309 | void *external_fdr; /* struct fdr_ext */ |
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310 | void *external_rfd; /* struct rfd_ext */ |
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311 | void *external_ext; /* struct ext_ext */ |
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312 | |||
313 | /* These fields are used when linking. They may disappear at some |
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314 | point. */ |
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315 | char *ssext_end; |
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316 | void *external_ext_end; |
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317 | |||
318 | /* When linking, this field holds a mapping from the input FDR |
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319 | numbers to the output numbers, and is used when writing out the |
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320 | external symbols. It is NULL if no mapping is required. */ |
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321 | RFDT *ifdmap; |
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322 | |||
323 | /* The swapped FDR information. Currently this is never NULL, but |
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324 | code using this structure should probably double-check in case |
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325 | this changes in the future. This is a pointer to an array, not a |
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326 | single structure. */ |
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327 | FDR *fdr; |
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328 | }; |
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329 | |||
330 | /* These structures are used by the ECOFF find_nearest_line function. */ |
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331 | |||
332 | struct ecoff_fdrtab_entry |
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333 | { |
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334 | /* Base address in .text of this FDR. */ |
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335 | bfd_vma base_addr; |
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336 | FDR *fdr; |
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337 | }; |
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338 | |||
339 | struct ecoff_find_line |
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340 | { |
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341 | /* Allocated memory to hold function and file names. */ |
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342 | char *find_buffer; |
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343 | |||
344 | /* FDR table, sorted by address: */ |
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345 | long fdrtab_len; |
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346 | struct ecoff_fdrtab_entry *fdrtab; |
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347 | |||
348 | /* Cache entry for most recently found line information. The sect |
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349 | field is NULL if this cache does not contain valid information. */ |
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350 | struct |
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351 | { |
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352 | asection *sect; |
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353 | bfd_vma start; |
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354 | bfd_vma stop; |
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355 | const char *filename; |
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356 | const char *functionname; |
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357 | unsigned int line_num; |
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358 | } cache; |
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359 | }; |
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360 | |||
361 | /********************** SWAPPING **********************/ |
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362 | |||
363 | /* The generic ECOFF code needs to be able to swap debugging |
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364 | information in and out in the specific format used by a particular |
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365 | ECOFF implementation. This structure provides the information |
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366 | needed to do this. */ |
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367 | |||
368 | struct ecoff_debug_swap |
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369 | { |
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370 | /* Symbol table magic number. */ |
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371 | int sym_magic; |
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372 | /* Alignment of debugging information. E.g., 4. */ |
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373 | bfd_size_type debug_align; |
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374 | /* Sizes of external symbolic information. */ |
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375 | bfd_size_type external_hdr_size; |
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376 | bfd_size_type external_dnr_size; |
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377 | bfd_size_type external_pdr_size; |
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378 | bfd_size_type external_sym_size; |
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379 | bfd_size_type external_opt_size; |
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380 | bfd_size_type external_fdr_size; |
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381 | bfd_size_type external_rfd_size; |
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382 | bfd_size_type external_ext_size; |
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383 | /* Functions to swap in external symbolic data. */ |
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384 | void (*swap_hdr_in) (bfd *, void *, HDRR *); |
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385 | void (*swap_dnr_in) (bfd *, void *, DNR *); |
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386 | void (*swap_pdr_in) (bfd *, void *, PDR *); |
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387 | void (*swap_sym_in) (bfd *, void *, SYMR *); |
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388 | void (*swap_opt_in) (bfd *, void *, OPTR *); |
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389 | void (*swap_fdr_in) (bfd *, void *, FDR *); |
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390 | void (*swap_rfd_in) (bfd *, void *, RFDT *); |
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391 | void (*swap_ext_in) (bfd *, void *, EXTR *); |
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392 | void (*swap_tir_in) (int, const struct tir_ext *, TIR *); |
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393 | void (*swap_rndx_in) (int, const struct rndx_ext *, RNDXR *); |
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394 | /* Functions to swap out external symbolic data. */ |
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395 | void (*swap_hdr_out) (bfd *, const HDRR *, void *); |
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396 | void (*swap_dnr_out) (bfd *, const DNR *, void *); |
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397 | void (*swap_pdr_out) (bfd *, const PDR *, void *); |
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398 | void (*swap_sym_out) (bfd *, const SYMR *, void *); |
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399 | void (*swap_opt_out) (bfd *, const OPTR *, void *); |
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400 | void (*swap_fdr_out) (bfd *, const FDR *, void *); |
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401 | void (*swap_rfd_out) (bfd *, const RFDT *, void *); |
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402 | void (*swap_ext_out) (bfd *, const EXTR *, void *); |
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403 | void (*swap_tir_out) (int, const TIR *, struct tir_ext *); |
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404 | void (*swap_rndx_out) (int, const RNDXR *, struct rndx_ext *); |
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405 | /* Function to read symbol data and set up pointers in |
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406 | ecoff_debug_info structure. The section argument is used for |
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407 | ELF, not straight ECOFF. */ |
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408 | bfd_boolean (*read_debug_info) (bfd *, asection *, struct ecoff_debug_info *); |
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409 | }; |
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410 | |||
411 | #endif /* ! defined (ECOFF_H) */ |