include/coff/sym.h

   1 /* Declarations of internal format of MIPS ECOFF symbols.
   2    Originally contributed by MIPS Computer Systems and Third Eye Software.
   3    Changes contributed by Cygnus Support are in the public domain.
   4
   5    This file is just aggregated with the files that make up the GNU
   6    release; it is not considered part of GAS, GDB, or other GNU
   7    programs.  */
   8
   9 /*
  10  * |-----------------------------------------------------------|
  11  * | Copyright (c) 1992, 1991, 1990 MIPS Computer Systems, Inc.|
  12  * | MIPS Computer Systems, Inc. grants reproduction and use   |
  13  * | rights to all parties, PROVIDED that this comment is      |
  14  * | maintained in the copy.                                   |
  15  * |-----------------------------------------------------------|
  16  */
  17 #ifndef _SYM_H
  18 #define _SYM_H
  19
  20 /* (C) Copyright 1984 by Third Eye Software, Inc.
  21  *
  22  * Third Eye Software, Inc. grants reproduction and use rights to
  23  * all parties, PROVIDED that this comment is maintained in the copy.
  24  *
  25  * Third Eye makes no claims about the applicability of this
  26  * symbol table to a particular use.
  27  */
  28
  29 /*
  30  * This file contains the definition of the Third Eye Symbol Table.
  31  *
  32  * Symbols are assumed to be in 'encounter order' - i.e. the order that
  33  * the things they represent were encountered by the compiler/assembler/loader.
  34  * EXCEPT for globals!  These are assumed to be bunched together,
  35  * probably right after the last 'normal' symbol.  Globals ARE sorted
  36  * in ascending order.
  37  *
  38  * -----------------------------------------------------------------------
  39  * A brief word about Third Eye naming/use conventions:
  40  *
  41  * All arrays and index's are 0 based.
  42  * All "ifooMax" values are the highest legal value PLUS ONE. This makes
  43  * them good for allocating arrays, etc. All checks are "ifoo < ifooMax".
  44  *
  45  * "isym"       Index into the SYMbol table.
  46  * "ipd"        Index into the Procedure Descriptor array.
  47  * "ifd"        Index into the File Descriptor array.
  48  * "iss"        Index into String Space.
  49  * "cb"         Count of Bytes.
  50  * "rgPd"       array whose domain is "0..ipdMax-1" and RanGe is PDR.
  51  * "rgFd"       array whose domain is "0..ifdMax-1" and RanGe is FDR.
  52  */
  53
  54
  55 /*
  56  * Symbolic Header (HDR) structure.
  57  * As long as all the pointers are set correctly,
  58  * we don't care WHAT order the various sections come out in!
  59  *
  60  * A file produced solely for the use of CDB will probably NOT have
  61  * any instructions or data areas in it, as these are available
  62  * in the original.
  63  */
  64
  65 typedef struct {
  66         short   magic;          /* to verify validity of the table */
  67         short   vstamp;         /* version stamp */
  68         long    ilineMax;       /* number of line number entries */
  69         bfd_vma cbLine;         /* number of bytes for line number entries */
  70         bfd_vma cbLineOffset;   /* offset to start of line number entries*/
  71         long    idnMax;         /* max index into dense number table */
  72         bfd_vma cbDnOffset;     /* offset to start dense number table */
  73         long    ipdMax;         /* number of procedures */
  74         bfd_vma cbPdOffset;     /* offset to procedure descriptor table */
  75         long    isymMax;        /* number of local symbols */
  76         bfd_vma cbSymOffset;    /* offset to start of local symbols*/
  77         long    ioptMax;        /* max index into optimization symbol entries */
  78         bfd_vma cbOptOffset;    /* offset to optimization symbol entries */
  79         long    iauxMax;        /* number of auxillary symbol entries */
  80         bfd_vma cbAuxOffset;    /* offset to start of auxillary symbol entries*/
  81         long    issMax;         /* max index into local strings */
  82         bfd_vma cbSsOffset;     /* offset to start of local strings */
  83         long    issExtMax;      /* max index into external strings */
  84         bfd_vma cbSsExtOffset;  /* offset to start of external strings */
  85         long    ifdMax;         /* number of file descriptor entries */
  86         bfd_vma cbFdOffset;     /* offset to file descriptor table */
  87         long    crfd;           /* number of relative file descriptor entries */
  88         bfd_vma cbRfdOffset;    /* offset to relative file descriptor table */
  89         long    iextMax;        /* max index into external symbols */
  90         bfd_vma cbExtOffset;    /* offset to start of external symbol entries*/
  91         /* If you add machine dependent fields, add them here */
  92         } HDRR, *pHDRR;
  93 #define cbHDRR sizeof(HDRR)
  94 #define hdrNil ((pHDRR)0)
  95
  96 /*
  97  * The FDR and PDR structures speed mapping of address <-> name.
  98  * They are sorted in ascending memory order and are kept in
  99  * memory by CDB at runtime.
 100  */
 101
 102 /*
 103  * File Descriptor
 104  *
 105  * There is one of these for EVERY FILE, whether compiled with
 106  * full debugging symbols or not.  The name of a file should be
 107  * the path name given to the compiler.  This allows the user
 108  * to simply specify the names of the directories where the COMPILES
 109  * were done, and we will be able to find their files.
 110  * A field whose comment starts with "R - " indicates that it will be
 111  * setup at runtime.
 112  */
 113 typedef struct fdr {
 114         bfd_vma adr;            /* memory address of beginning of file */
 115         long    rss;            /* file name (of source, if known) */
 116         long    issBase;        /* file's string space */
 117         bfd_vma cbSs;           /* number of bytes in the ss */
 118         long    isymBase;       /* beginning of symbols */
 119         long    csym;           /* count file's of symbols */
 120         long    ilineBase;      /* file's line symbols */
 121         long    cline;          /* count of file's line symbols */
 122         long    ioptBase;       /* file's optimization entries */
 123         long    copt;           /* count of file's optimization entries */
 124         unsigned short ipdFirst;/* start of procedures for this file */
 125         short   cpd;            /* count of procedures for this file */
 126         long    iauxBase;       /* file's auxiliary entries */
 127         long    caux;           /* count of file's auxiliary entries */
 128         long    rfdBase;        /* index into the file indirect table */
 129         long    crfd;           /* count file indirect entries */
 130         unsigned lang: 5;       /* language for this file */
 131         unsigned fMerge : 1;    /* whether this file can be merged */
 132         unsigned fReadin : 1;   /* true if it was read in (not just created) */
 133         unsigned fBigendian : 1;/* if set, was compiled on big endian machine */
 134                                 /*      aux's will be in compile host's sex */
 135         unsigned glevel : 2;    /* level this file was compiled with */
 136         unsigned reserved : 22;  /* reserved for future use */
 137         bfd_vma cbLineOffset;   /* byte offset from header for this file ln's */
 138         bfd_vma cbLine;         /* size of lines for this file */
 139         } FDR, *pFDR;
 140 #define cbFDR sizeof(FDR)
 141 #define fdNil ((pFDR)0)
 142 #define ifdNil -1
 143 #define ifdTemp 0
 144 #define ilnNil -1
 145
 146
 147 /*
 148  * Procedure Descriptor
 149  *
 150  * There is one of these for EVERY TEXT LABEL.
 151  * If a procedure is in a file with full symbols, then isym
 152  * will point to the PROC symbols, else it will point to the
 153  * global symbol for the label.
 154  */
 155
 156 typedef struct pdr {
 157         bfd_vma adr;            /* memory address of start of procedure */
 158         long    isym;           /* start of local symbol entries */
 159         long    iline;          /* start of line number entries*/
 160         long    regmask;        /* save register mask */
 161         long    regoffset;      /* save register offset */
 162         long    iopt;           /* start of optimization symbol entries*/
 163         long    fregmask;       /* save floating point register mask */
 164         long    fregoffset;     /* save floating point register offset */
 165         long    frameoffset;    /* frame size */
 166         short   framereg;       /* frame pointer register */
 167         short   pcreg;          /* offset or reg of return pc */
 168         long    lnLow;          /* lowest line in the procedure */
 169         long    lnHigh;         /* highest line in the procedure */
 170         bfd_vma cbLineOffset;   /* byte offset for this procedure from the fd base */
 171         /* These fields are new for 64 bit ECOFF.  */
 172         unsigned gp_prologue : 8; /* byte size of GP prologue */
 173         unsigned gp_used : 1;   /* true if the procedure uses GP */
 174         unsigned reg_frame : 1; /* true if register frame procedure */
 175         unsigned prof : 1;      /* true if compiled with -pg */
 176         unsigned reserved : 13; /* reserved: must be zero */
 177         unsigned localoff : 8;  /* offset of local variables from vfp */
 178         } PDR, *pPDR;
 179 #define cbPDR sizeof(PDR)
 180 #define pdNil ((pPDR) 0)
 181 #define ipdNil  -1
 182
 183 /*
 184  * The structure of the runtime procedure descriptor created by the loader
 185  * for use by the static exception system.
 186  */
 187 /*
 188  * If 0'd out because exception_info chokes Visual C++ and because there
 189  * don't seem to be any references to this structure elsewhere in gdb.
 190  */
 191 #if 0
 192 typedef struct runtime_pdr {
 193         bfd_vma adr;            /* memory address of start of procedure */
 194         long    regmask;        /* save register mask */
 195         long    regoffset;      /* save register offset */
 196         long    fregmask;       /* save floating point register mask */
 197         long    fregoffset;     /* save floating point register offset */
 198         long    frameoffset;    /* frame size */
 199         short   framereg;       /* frame pointer register */
 200         short   pcreg;          /* offset or reg of return pc */
 201         long    irpss;          /* index into the runtime string table */
 202         long    reserved;
 203         struct exception_info *exception_info;/* pointer to exception array */
 204 } RPDR, *pRPDR;
 205 #define cbRPDR sizeof(RPDR)
 206 #define rpdNil ((pRPDR) 0)
 207 #endif
 208
 209 /*
 210  * Line Numbers
 211  *
 212  * Line Numbers are segregated from the normal symbols because they
 213  * are [1] smaller , [2] are of no interest to your
 214  * average loader, and [3] are never needed in the middle of normal
 215  * scanning and therefore slow things down.
 216  *
 217  * By definition, the first LINER for any given procedure will have
 218  * the first line of a procedure and represent the first address.
 219  */
 220
 221 typedef long LINER, *pLINER;
 222 #define lineNil ((pLINER)0)
 223 #define cbLINER sizeof(LINER)
 224 #define ilineNil        -1
 225
 226
 227
 228 /*
 229  * The Symbol Structure         (GFW, to those who Know!)
 230  */
 231
 232 typedef struct {
 233         long    iss;            /* index into String Space of name */
 234         bfd_vma value;          /* value of symbol */
 235         unsigned st : 6;        /* symbol type */
 236         unsigned sc  : 5;       /* storage class - text, data, etc */
 237         unsigned reserved : 1;  /* reserved */
 238         unsigned index : 20;    /* index into sym/aux table */
 239         } SYMR, *pSYMR;
 240 #define symNil ((pSYMR)0)
 241 #define cbSYMR sizeof(SYMR)
 242 #define isymNil -1
 243 #define indexNil 0xfffff
 244 #define issNil -1
 245 #define issNull 0
 246
 247
 248 /* The following converts a memory resident string to an iss.
 249  * This hack is recognized in SbFIss, in sym.c of the debugger.
 250  */
 251 #define IssFSb(sb) (0x80000000 | ((unsigned long)(sb)))
 252
 253 /* E X T E R N A L   S Y M B O L  R E C O R D
 254  *
 255  *      Same as the SYMR except it contains file context to determine where
 256  *      the index is.
 257  */
 258 typedef struct ecoff_extr {
 259         unsigned jmptbl:1;      /* symbol is a jump table entry for shlibs */
 260         unsigned cobol_main:1;  /* symbol is a cobol main procedure */
 261         unsigned weakext:1;     /* symbol is weak external */
 262         unsigned reserved:13;   /* reserved for future use */
 263         int     ifd;            /* where the iss and index fields point into */
 264         SYMR    asym;           /* symbol for the external */
 265         } EXTR, *pEXTR;
 266 #define extNil ((pEXTR)0)
 267 #define cbEXTR sizeof(EXTR)
 268
 269
 270 /* A U X I L L A R Y   T Y P E   I N F O R M A T I O N */
 271
 272 /*
 273  * Type Information Record
 274  */
 275 typedef struct {
 276         unsigned fBitfield : 1; /* set if bit width is specified */
 277         unsigned continued : 1; /* indicates additional TQ info in next AUX */
 278         unsigned bt  : 6;       /* basic type */
 279         unsigned tq4 : 4;
 280         unsigned tq5 : 4;
 281         /* ---- 16 bit boundary ---- */
 282         unsigned tq0 : 4;
 283         unsigned tq1 : 4;       /* 6 type qualifiers - tqPtr, etc. */
 284         unsigned tq2 : 4;
 285         unsigned tq3 : 4;
 286         } TIR, *pTIR;
 287 #define cbTIR sizeof(TIR)
 288 #define tiNil ((pTIR)0)
 289 #define itqMax 6
 290
 291 /*
 292  * Relative symbol record
 293  *
 294  * If the rfd field is 4095, the index field indexes into the global symbol
 295  *      table.
 296  */
 297
 298 typedef struct {
 299         unsigned        rfd : 12;    /* index into the file indirect table */
 300         unsigned        index : 20; /* index int sym/aux/iss tables */
 301         } RNDXR, *pRNDXR;
 302 #define cbRNDXR sizeof(RNDXR)
 303 #define rndxNil ((pRNDXR)0)
 304
 305 /* dense numbers or sometimes called block numbers are stored in this type,
 306  *      a rfd of 0xffffffff is an index into the global table.
 307  */
 308 typedef struct {
 309         unsigned long   rfd;    /* index into the file table */
 310         unsigned long   index;  /* index int sym/aux/iss tables */
 311         } DNR, *pDNR;
 312 #define cbDNR sizeof(DNR)
 313 #define dnNil ((pDNR)0)
 314
 315
 316
 317 /*
 318  * Auxillary information occurs only if needed.
 319  * It ALWAYS occurs in this order when present.
 320
 321             isymMac             used by stProc only
 322             TIR                 type info
 323             TIR                 additional TQ info (if first TIR was not enough)
 324             rndx                if (bt == btStruct,btUnion,btEnum,btSet,btRange,
 325                                     btTypedef):
 326                                     rsym.index == iaux for btSet or btRange
 327                                     else rsym.index == isym
 328             dimLow              btRange, btSet
 329             dimMac              btRange, btSet
 330             rndx0               As many as there are tq arrays
 331             dimLow0
 332             dimHigh0
 333             ...
 334             rndxMax-1
 335             dimLowMax-1
 336             dimHighMax-1
 337             width in bits       if (bit field), width in bits.
 338  */
 339 #define cAuxMax (6 + (idimMax*3))
 340
 341 /* a union of all possible info in the AUX universe */
 342 typedef union {
 343         TIR     ti;             /* type information record */
 344         RNDXR   rndx;           /* relative index into symbol table */
 345         long    dnLow;          /* low dimension */
 346         long    dnHigh;         /* high dimension */
 347         long    isym;           /* symbol table index (end of proc) */
 348         long    iss;            /* index into string space (not used) */
 349         long    width;          /* width for non-default sized struc fields */
 350         long    count;          /* count of ranges for variant arm */
 351         } AUXU, *pAUXU;
 352 #define cbAUXU sizeof(AUXU)
 353 #define auxNil ((pAUXU)0)
 354 #define iauxNil -1
 355
 356
 357 /*
 358  * Optimization symbols
 359  *
 360  * Optimization symbols contain some overlap information with the normal
 361  * symbol table. In particular, the proc information
 362  * is somewhat redundant but necessary to easily find the other information
 363  * present.
 364  *
 365  * All of the offsets are relative to the beginning of the last otProc
 366  */
 367
 368 typedef struct {
 369         unsigned ot: 8;         /* optimization type */
 370         unsigned value: 24;     /* address where we are moving it to */
 371         RNDXR   rndx;           /* points to a symbol or opt entry */
 372         unsigned long   offset; /* relative offset this occured */
 373         } OPTR, *pOPTR;
 374 #define optNil  ((pOPTR) 0)
 375 #define cbOPTR sizeof(OPTR)
 376 #define ioptNil -1
 377
 378 /*
 379  * File Indirect
 380  *
 381  * When a symbol is referenced across files the following procedure is used:
 382  *      1) use the file index to get the File indirect entry.
 383  *      2) use the file indirect entry to get the File descriptor.
 384  *      3) add the sym index to the base of that file's sym table
 385  *
 386  */
 387
 388 typedef long RFDT, *pRFDT;
 389 #define cbRFDT sizeof(RFDT)
 390 #define rfdNil  -1
 391
 392 /*
 393  * The file indirect table in the mips loader is known as an array of FITs.
 394  * This is done to keep the code in the loader readable in the area where
 395  * these tables are merged.  Note this is only a name change.
 396  */
 397 typedef long FIT, *pFIT;
 398 #define cbFIT   sizeof(FIT)
 399 #define ifiNil  -1
 400 #define fiNil   ((pFIT) 0)
 401
 402 #ifdef _LANGUAGE_PASCAL
 403 #define ifdNil -1
 404 #define ilnNil -1
 405 #define ipdNil -1
 406 #define ilineNil -1
 407 #define isymNil -1
 408 #define indexNil 16#fffff
 409 #define issNil -1
 410 #define issNull 0
 411 #define itqMax 6
 412 #define iauxNil -1
 413 #define ioptNil -1
 414 #define rfdNil -1
 415 #define ifiNil -1
 416 #endif  /* _LANGUAGE_PASCAL */
 417
 418
 419 /* Dense numbers
 420  *
 421  * Rather than use file index, symbol index pairs to represent symbols
 422  *      and globals, we use dense number so that they can be easily embeded
 423  *      in intermediate code and the programs that process them can
 424  *      use direct access tabls instead of hash table (which would be
 425  *      necesary otherwise because of the sparse name space caused by
 426  *      file index, symbol index pairs. Dense number are represented
 427  *      by RNDXRs.
 428  */
 429
 430 /*
 431  * The following table defines the meaning of each SYM field as
 432  * a function of the "st". (scD/B == scData OR scBss)
 433  *
 434  * Note: the value "isymMac" is used by symbols that have the concept
 435  * of enclosing a block of related information.  This value is the
 436  * isym of the first symbol AFTER the end associated with the primary
 437  * symbol. For example if a procedure was at isym==90 and had an
 438  * isymMac==155, the associated end would be at isym==154, and the
 439  * symbol at 155 would probably (although not necessarily) be the
 440  * symbol for the next procedure.  This allows rapid skipping over
 441  * internal information of various sorts. "stEnd"s ALWAYS have the
 442  * isym of the primary symbol that started the block.
 443  *
 444
 445 ST              SC      VALUE           INDEX
 446 --------        ------  --------        ------
 447 stFile          scText  address         isymMac
 448 stLabel         scText  address         ---
 449 stGlobal        scD/B   address         iaux
 450 stStatic        scD/B   address         iaux
 451 stParam         scAbs   offset          iaux
 452 stLocal         scAbs   offset          iaux
 453 stProc          scText  address         iaux    (isymMac is first AUX)
 454 stStaticProc    scText  address         iaux    (isymMac is first AUX)
 455
 456 stMember        scNil   ordinal         ---     (if member of enum)
 457         (mipsread thinks the case below has a bit, not byte, offset.)
 458 stMember        scNil   byte offset     iaux    (if member of struct/union)
 459 stMember        scBits  bit offset      iaux    (bit field spec)
 460
 461 stBlock         scText  address         isymMac (text block)
 462         (the code seems to think that rather than scNil, we see scInfo for
 463          the two cases below.)
 464 stBlock         scNil   cb              isymMac (struct/union member define)
 465 stBlock         scNil   cMembers        isymMac (enum member define)
 466
 467         (New types added by SGI to simplify things:)
 468 stStruct        scInfo  cb              isymMac (struct type define)
 469 stUnion         scInfo  cb              isymMac (union  type define)
 470 stEnum          scInfo  cMembers        isymMac (enum   type define)
 471
 472 stEnd           scText  address         isymStart
 473 stEnd           scNil   -------         isymStart (struct/union/enum)
 474
 475 stTypedef       scNil   -------         iaux
 476 stRegReloc      sc???   value           old register number
 477 stForward       sc???   new address     isym to original symbol
 478
 479 stConstant      scInfo  value           --- (scalar)
 480 stConstant      scInfo  iss             --- (complex, e.g. string)
 481
 482  *
 483  */
 484 #endif