misc/bits/stab.def

   1 /* Table of DBX symbol codes for the GNU system.
   2    Copyright (C) 1988, 1997-2023 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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* This contains contribution from Cygnus Support.  */
  20 \f
  21 /* Global variable.  Only the name is significant.
  22    To find the address, look in the corresponding external symbol.  */
  23 __define_stab (N_GSYM, 0x20, "GSYM")
  24
  25 /* Function name for BSD Fortran.  Only the name is significant.
  26    To find the address, look in the corresponding external symbol.  */
  27 __define_stab (N_FNAME, 0x22, "FNAME")
  28
  29 /* Function name or text-segment variable for C.  Value is its address.
  30    Desc is supposedly starting line number, but GCC doesn't set it
  31    and DBX seems not to miss it.  */
  32 __define_stab (N_FUN, 0x24, "FUN")
  33
  34 /* Data-segment variable with internal linkage.  Value is its address.
  35    "Static Sym".  */
  36 __define_stab (N_STSYM, 0x26, "STSYM")
  37
  38 /* BSS-segment variable with internal linkage.  Value is its address.  */
  39 __define_stab (N_LCSYM, 0x28, "LCSYM")
  40
  41 /* Name of main routine.  Only the name is significant.
  42    This is not used in C.  */
  43 __define_stab (N_MAIN, 0x2a, "MAIN")
  44
  45 /* Global symbol in Pascal.
  46    Supposedly the value is its line number; I'm skeptical.  */
  47 __define_stab (N_PC, 0x30, "PC")
  48
  49 /* Number of symbols:  0, files,,funcs,lines according to Ultrix V4.0. */
  50 __define_stab (N_NSYMS, 0x32, "NSYMS")
  51
  52 /* "No DST map for sym: name, ,0,type,ignored"  according to Ultrix V4.0. */
  53 __define_stab (N_NOMAP, 0x34, "NOMAP")
  54
  55 /* New stab from Solaris.  I don't know what it means, but it
  56    don't seem to contain useful information.  */
  57 __define_stab (N_OBJ, 0x38, "OBJ")
  58
  59 /* New stab from Solaris.  I don't know what it means, but it
  60    don't seem to contain useful information.  Possibly related to the
  61    optimization flags used in this module.  */
  62 __define_stab (N_OPT, 0x3c, "OPT")
  63
  64 /* Register variable.  Value is number of register.  */
  65 __define_stab (N_RSYM, 0x40, "RSYM")
  66
  67 /* Modula-2 compilation unit.  Can someone say what info it contains?  */
  68 __define_stab (N_M2C, 0x42, "M2C")
  69
  70 /* Line number in text segment.  Desc is the line number;
  71    value is corresponding address.  */
  72 __define_stab (N_SLINE, 0x44, "SLINE")
  73
  74 /* Similar, for data segment.  */
  75 __define_stab (N_DSLINE, 0x46, "DSLINE")
  76
  77 /* Similar, for bss segment.  */
  78 __define_stab (N_BSLINE, 0x48, "BSLINE")
  79
  80 /* Sun's source-code browser stabs.  ?? Don't know what the fields are.
  81    Supposedly the field is "path to associated .cb file".  THIS VALUE
  82    OVERLAPS WITH N_BSLINE!  */
  83 __define_stab (N_BROWS, 0x48, "BROWS")
  84
  85 /* GNU Modula-2 definition module dependency.  Value is the modification time
  86    of the definition file.  Other is non-zero if it is imported with the
  87    GNU M2 keyword %INITIALIZE.  Perhaps N_M2C can be used if there
  88    are enough empty fields? */
  89 __define_stab(N_DEFD, 0x4a, "DEFD")
  90
  91 /* THE FOLLOWING TWO STAB VALUES CONFLICT.  Happily, one is for Modula-2
  92    and one is for C++.   Still,... */
  93 /* GNU C++ exception variable.  Name is variable name.  */
  94 __define_stab (N_EHDECL, 0x50, "EHDECL")
  95 /* Modula2 info "for imc":  name,,0,0,0  according to Ultrix V4.0.  */
  96 __define_stab (N_MOD2, 0x50, "MOD2")
  97
  98 /* GNU C++ `catch' clause.  Value is its address.  Desc is nonzero if
  99    this entry is immediately followed by a CAUGHT stab saying what exception
 100    was caught.  Multiple CAUGHT stabs means that multiple exceptions
 101    can be caught here.  If Desc is 0, it means all exceptions are caught
 102    here.  */
 103 __define_stab (N_CATCH, 0x54, "CATCH")
 104
 105 /* Structure or union element.  Value is offset in the structure.  */
 106 __define_stab (N_SSYM, 0x60, "SSYM")
 107
 108 /* Name of main source file.
 109    Value is starting text address of the compilation.  */
 110 __define_stab (N_SO, 0x64, "SO")
 111
 112 /* Automatic variable in the stack.  Value is offset from frame pointer.
 113    Also used for type descriptions.  */
 114 __define_stab (N_LSYM, 0x80, "LSYM")
 115
 116 /* Beginning of an include file.  Only Sun uses this.
 117    In an object file, only the name is significant.
 118    The Sun linker puts data into some of the other fields.  */
 119 __define_stab (N_BINCL, 0x82, "BINCL")
 120
 121 /* Name of sub-source file (#include file).
 122    Value is starting text address of the compilation.  */
 123 __define_stab (N_SOL, 0x84, "SOL")
 124
 125 /* Parameter variable.  Value is offset from argument pointer.
 126    (On most machines the argument pointer is the same as the frame pointer.  */
 127 __define_stab (N_PSYM, 0xa0, "PSYM")
 128
 129 /* End of an include file.  No name.
 130    This and N_BINCL act as brackets around the file's output.
 131    In an object file, there is no significant data in this entry.
 132    The Sun linker puts data into some of the fields.  */
 133 __define_stab (N_EINCL, 0xa2, "EINCL")
 134
 135 /* Alternate entry point.  Value is its address.  */
 136 __define_stab (N_ENTRY, 0xa4, "ENTRY")
 137
 138 /* Beginning of lexical block.
 139    The desc is the nesting level in lexical blocks.
 140    The value is the address of the start of the text for the block.
 141    The variables declared inside the block *precede* the N_LBRAC symbol.  */
 142 __define_stab (N_LBRAC, 0xc0, "LBRAC")
 143
 144 /* Place holder for deleted include file.  Replaces a N_BINCL and everything
 145    up to the corresponding N_EINCL.  The Sun linker generates these when
 146    it finds multiple identical copies of the symbols from an include file.
 147    This appears only in output from the Sun linker.  */
 148 __define_stab (N_EXCL, 0xc2, "EXCL")
 149
 150 /* Modula-2 scope information.  Can someone say what info it contains?  */
 151 __define_stab (N_SCOPE, 0xc4, "SCOPE")
 152
 153 /* End of a lexical block.  Desc matches the N_LBRAC's desc.
 154    The value is the address of the end of the text for the block.  */
 155 __define_stab (N_RBRAC, 0xe0, "RBRAC")
 156
 157 /* Begin named common block.  Only the name is significant.  */
 158 __define_stab (N_BCOMM, 0xe2, "BCOMM")
 159
 160 /* End named common block.  Only the name is significant
 161    (and it should match the N_BCOMM).  */
 162 __define_stab (N_ECOMM, 0xe4, "ECOMM")
 163
 164 /* End common (local name): value is address.
 165    I'm not sure how this is used.  */
 166 __define_stab (N_ECOML, 0xe8, "ECOML")
 167
 168 /* These STAB's are used on Gould systems for Non-Base register symbols
 169    or something like that.  FIXME.  I have assigned the values at random
 170    since I don't have a Gould here.  Fixups from Gould folk welcome... */
 171 __define_stab (N_NBTEXT, 0xF0, "NBTEXT")
 172 __define_stab (N_NBDATA, 0xF2, "NBDATA")
 173 __define_stab (N_NBBSS,  0xF4, "NBBSS")
 174 __define_stab (N_NBSTS,  0xF6, "NBSTS")
 175 __define_stab (N_NBLCS,  0xF8, "NBLCS")
 176
 177 /* Second symbol entry containing a length-value for the preceding entry.
 178    The value is the length.  */
 179 __define_stab (N_LENG, 0xfe, "LENG")
 180 \f
 181 /* The above information, in matrix format.
 182
 183                         STAB MATRIX
 184         _________________________________________________
 185         | 00 - 1F are not dbx stab symbols              |
 186         | In most cases, the low bit is the EXTernal bit|
 187
 188         | 00 UNDEF  | 02 ABS    | 04 TEXT   | 06 DATA   |
 189         | 01  |EXT  | 03  |EXT  | 05  |EXT  | 07  |EXT  |
 190
 191         | 08 BSS    | 0A INDR   | 0C FN_SEQ | 0E        |
 192         | 09  |EXT  | 0B        | 0D        | 0F        |
 193
 194         | 10        | 12 COMM   | 14 SETA   | 16 SETT   |
 195         | 11        | 13        | 15        | 17        |
 196
 197         | 18 SETD   | 1A SETB   | 1C SETV   | 1E WARNING|
 198         | 19        | 1B        | 1D        | 1F FN     |
 199
 200         |_______________________________________________|
 201         | Debug entries with bit 01 set are unused.     |
 202         | 20 GSYM   | 22 FNAME  | 24 FUN    | 26 STSYM  |
 203         | 28 LCSYM  | 2A MAIN   | 2C        | 2E        |
 204         | 30 PC     | 32 NSYMS  | 34 NOMAP  | 36        |
 205         | 38 OBJ    | 3A        | 3C OPT    | 3E        |
 206         | 40 RSYM   | 42 M2C    | 44 SLINE  | 46 DSLINE |
 207         | 48 BSLINE*| 4A DEFD   | 4C        | 4E        |
 208         | 50 EHDECL*| 52        | 54 CATCH  | 56        |
 209         | 58        | 5A        | 5C        | 5E        |
 210         | 60 SSYM   | 62        | 64 SO     | 66        |
 211         | 68        | 6A        | 6C        | 6E        |
 212         | 70        | 72        | 74        | 76        |
 213         | 78        | 7A        | 7C        | 7E        |
 214         | 80 LSYM   | 82 BINCL  | 84 SOL    | 86        |
 215         | 88        | 8A        | 8C        | 8E        |
 216         | 90        | 92        | 94        | 96        |
 217         | 98        | 9A        | 9C        | 9E        |
 218         | A0 PSYM   | A2 EINCL  | A4 ENTRY  | A6        |
 219         | A8        | AA        | AC        | AE        |
 220         | B0        | B2        | B4        | B6        |
 221         | B8        | BA        | BC        | BE        |
 222         | C0 LBRAC  | C2 EXCL   | C4 SCOPE  | C6        |
 223         | C8        | CA        | CC        | CE        |
 224         | D0        | D2        | D4        | D6        |
 225         | D8        | DA        | DC        | DE        |
 226         | E0 RBRAC  | E2 BCOMM  | E4 ECOMM  | E6        |
 227         | E8 ECOML  | EA        | EC        | EE        |
 228         | F0        | F2        | F4        | F6        |
 229         | F8        | FA        | FC        | FE LENG   |
 230         +-----------------------------------------------+
 231  * 50 EHDECL is also MOD2.
 232  * 48 BSLINE is also BROWS.
 233  */