source: trunk/libs/newlib/src/include/coff/sym.h @ 684

/* Declarations of internal format of MIPS ECOFF symbols.
   Originally contributed by MIPS Computer Systems and Third Eye Software.
   Changes contributed by Cygnus Support are in the public domain.  

   This file is just aggregated with the files that make up the GNU
   release; it is not considered part of GAS, GDB, or other GNU
   programs.  */

/*
 * |-----------------------------------------------------------|
 * | Copyright (c) 1992, 1991, 1990 MIPS Computer Systems, Inc.|
 * | MIPS Computer Systems, Inc. grants reproduction and use   |
 * | rights to all parties, PROVIDED that this comment is      |
 * | maintained in the copy.                                   |
 * |-----------------------------------------------------------|
 */
#ifndef _SYM_H
#define _SYM_H

/* (C) Copyright 1984 by Third Eye Software, Inc.
 *
 * Third Eye Software, Inc. grants reproduction and use rights to
 * all parties, PROVIDED that this comment is maintained in the copy.
 *
 * Third Eye makes no claims about the applicability of this
 * symbol table to a particular use.
 */

/* 
 * This file contains the definition of the Third Eye Symbol Table.
 *
 * Symbols are assumed to be in 'encounter order' - i.e. the order that
 * the things they represent were encountered by the compiler/assembler/loader.
 * EXCEPT for globals!  These are assumed to be bunched together,
 * probably right after the last 'normal' symbol.  Globals ARE sorted
 * in ascending order.
 *
 * -----------------------------------------------------------------------
 * A brief word about Third Eye naming/use conventions:
 *
 * All arrays and index's are 0 based.
 * All "ifooMax" values are the highest legal value PLUS ONE. This makes
 * them good for allocating arrays, etc. All checks are "ifoo < ifooMax".
 *
 * "isym"       Index into the SYMbol table.
 * "ipd"        Index into the Procedure Descriptor array.
 * "ifd"        Index into the File Descriptor array.
 * "iss"        Index into String Space.
 * "cb"         Count of Bytes.
 * "rgPd"       array whose domain is "0..ipdMax-1" and RanGe is PDR.
 * "rgFd"       array whose domain is "0..ifdMax-1" and RanGe is FDR.
 */


/* 
 * Symbolic Header (HDR) structure.
 * As long as all the pointers are set correctly,
 * we don't care WHAT order the various sections come out in!
 *
 * A file produced solely for the use of CDB will probably NOT have
 * any instructions or data areas in it, as these are available
 * in the original.
 */

typedef struct {
        short   magic;          /* to verify validity of the table */
        short   vstamp;         /* version stamp */
        long    ilineMax;       /* number of line number entries */
        bfd_vma cbLine;         /* number of bytes for line number entries */
        bfd_vma cbLineOffset;   /* offset to start of line number entries*/
        long    idnMax;         /* max index into dense number table */
        bfd_vma cbDnOffset;     /* offset to start dense number table */
        long    ipdMax;         /* number of procedures */
        bfd_vma cbPdOffset;     /* offset to procedure descriptor table */
        long    isymMax;        /* number of local symbols */
        bfd_vma cbSymOffset;    /* offset to start of local symbols*/
        long    ioptMax;        /* max index into optimization symbol entries */
        bfd_vma cbOptOffset;    /* offset to optimization symbol entries */
        long    iauxMax;        /* number of auxillary symbol entries */
        bfd_vma cbAuxOffset;    /* offset to start of auxillary symbol entries*/
        long    issMax;         /* max index into local strings */
        bfd_vma cbSsOffset;     /* offset to start of local strings */
        long    issExtMax;      /* max index into external strings */
        bfd_vma cbSsExtOffset;  /* offset to start of external strings */
        long    ifdMax;         /* number of file descriptor entries */
        bfd_vma cbFdOffset;     /* offset to file descriptor table */
        long    crfd;           /* number of relative file descriptor entries */
        bfd_vma cbRfdOffset;    /* offset to relative file descriptor table */
        long    iextMax;        /* max index into external symbols */
        bfd_vma cbExtOffset;    /* offset to start of external symbol entries*/
        /* If you add machine dependent fields, add them here */
        } HDRR, *pHDRR; 
#define cbHDRR sizeof(HDRR)
#define hdrNil ((pHDRR)0)

/*
 * The FDR and PDR structures speed mapping of address <-> name.
 * They are sorted in ascending memory order and are kept in
 * memory by CDB at runtime.
 */

/* 
 * File Descriptor
 *
 * There is one of these for EVERY FILE, whether compiled with
 * full debugging symbols or not.  The name of a file should be
 * the path name given to the compiler.  This allows the user
 * to simply specify the names of the directories where the COMPILES
 * were done, and we will be able to find their files.
 * A field whose comment starts with "R - " indicates that it will be
 * setup at runtime.
 */
typedef struct fdr {
        bfd_vma adr;            /* memory address of beginning of file */
        long    rss;            /* file name (of source, if known) */
        long    issBase;        /* file's string space */
        bfd_vma cbSs;           /* number of bytes in the ss */
        long    isymBase;       /* beginning of symbols */
        long    csym;           /* count file's of symbols */
        long    ilineBase;      /* file's line symbols */
        long    cline;          /* count of file's line symbols */
        long    ioptBase;       /* file's optimization entries */
        long    copt;           /* count of file's optimization entries */
        unsigned short ipdFirst;/* start of procedures for this file */
        short   cpd;            /* count of procedures for this file */
        long    iauxBase;       /* file's auxiliary entries */
        long    caux;           /* count of file's auxiliary entries */
        long    rfdBase;        /* index into the file indirect table */
        long    crfd;           /* count file indirect entries */
        unsigned lang: 5;       /* language for this file */
        unsigned fMerge : 1;    /* whether this file can be merged */
        unsigned fReadin : 1;   /* true if it was read in (not just created) */
        unsigned fBigendian : 1;/* if set, was compiled on big endian machine */
                                /*      aux's will be in compile host's sex */
        unsigned glevel : 2;    /* level this file was compiled with */
        unsigned reserved : 22;  /* reserved for future use */
        bfd_vma cbLineOffset;   /* byte offset from header for this file ln's */
        bfd_vma cbLine;         /* size of lines for this file */
        } FDR, *pFDR;
#define cbFDR sizeof(FDR)
#define fdNil ((pFDR)0)
#define ifdNil -1
#define ifdTemp 0
#define ilnNil -1


/* 
 * Procedure Descriptor
 *
 * There is one of these for EVERY TEXT LABEL.
 * If a procedure is in a file with full symbols, then isym
 * will point to the PROC symbols, else it will point to the
 * global symbol for the label.
 */

typedef struct pdr {
        bfd_vma adr;            /* memory address of start of procedure */
        long    isym;           /* start of local symbol entries */
        long    iline;          /* start of line number entries*/
        long    regmask;        /* save register mask */
        long    regoffset;      /* save register offset */
        long    iopt;           /* start of optimization symbol entries*/
        long    fregmask;       /* save floating point register mask */
        long    fregoffset;     /* save floating point register offset */
        long    frameoffset;    /* frame size */
        short   framereg;       /* frame pointer register */
        short   pcreg;          /* offset or reg of return pc */
        long    lnLow;          /* lowest line in the procedure */
        long    lnHigh;         /* highest line in the procedure */
        bfd_vma cbLineOffset;   /* byte offset for this procedure from the fd base */
        /* These fields are new for 64 bit ECOFF.  */
        unsigned gp_prologue : 8; /* byte size of GP prologue */
        unsigned gp_used : 1;   /* true if the procedure uses GP */
        unsigned reg_frame : 1; /* true if register frame procedure */
        unsigned prof : 1;      /* true if compiled with -pg */
        unsigned reserved : 13; /* reserved: must be zero */
        unsigned localoff : 8;  /* offset of local variables from vfp */
        } PDR, *pPDR;
#define cbPDR sizeof(PDR)
#define pdNil ((pPDR) 0)
#define ipdNil  -1

/*
 * The structure of the runtime procedure descriptor created by the loader
 * for use by the static exception system.
 */
/*
 * If 0'd out because exception_info chokes Visual C++ and because there
 * don't seem to be any references to this structure elsewhere in gdb.
 */
#if 0
typedef struct runtime_pdr {
        bfd_vma adr;            /* memory address of start of procedure */
        long    regmask;        /* save register mask */
        long    regoffset;      /* save register offset */
        long    fregmask;       /* save floating point register mask */
        long    fregoffset;     /* save floating point register offset */
        long    frameoffset;    /* frame size */
        short   framereg;       /* frame pointer register */
        short   pcreg;          /* offset or reg of return pc */
        long    irpss;          /* index into the runtime string table */
        long    reserved;
        struct exception_info *exception_info;/* pointer to exception array */
} RPDR, *pRPDR;
#define cbRPDR sizeof(RPDR)
#define rpdNil ((pRPDR) 0)
#endif

/*
 * Line Numbers
 *
 * Line Numbers are segregated from the normal symbols because they
 * are [1] smaller , [2] are of no interest to your
 * average loader, and [3] are never needed in the middle of normal
 * scanning and therefore slow things down.
 *
 * By definition, the first LINER for any given procedure will have
 * the first line of a procedure and represent the first address.
 */

typedef long LINER, *pLINER;
#define lineNil ((pLINER)0)
#define cbLINER sizeof(LINER)
#define ilineNil        -1



/*
 * The Symbol Structure         (GFW, to those who Know!)
 */

typedef struct {
        long    iss;            /* index into String Space of name */
        bfd_vma value;          /* value of symbol */
        unsigned st : 6;        /* symbol type */
        unsigned sc  : 5;       /* storage class - text, data, etc */
        unsigned reserved : 1;  /* reserved */
        unsigned index : 20;    /* index into sym/aux table */
        } SYMR, *pSYMR;
#define symNil ((pSYMR)0)
#define cbSYMR sizeof(SYMR)
#define isymNil -1
#define indexNil 0xfffff
#define issNil -1
#define issNull 0


/* The following converts a memory resident string to an iss.
 * This hack is recognized in SbFIss, in sym.c of the debugger.
 */
#define IssFSb(sb) (0x80000000 | ((unsigned long)(sb)))

/* E X T E R N A L   S Y M B O L  R E C O R D
 *
 *      Same as the SYMR except it contains file context to determine where
 *      the index is.
 */
typedef struct ecoff_extr {
        unsigned jmptbl:1;      /* symbol is a jump table entry for shlibs */
        unsigned cobol_main:1;  /* symbol is a cobol main procedure */
        unsigned weakext:1;     /* symbol is weak external */
        unsigned reserved:13;   /* reserved for future use */
        int     ifd;            /* where the iss and index fields point into */
        SYMR    asym;           /* symbol for the external */
        } EXTR, *pEXTR;
#define extNil ((pEXTR)0)
#define cbEXTR sizeof(EXTR)


/* A U X I L L A R Y   T Y P E   I N F O R M A T I O N */

/*
 * Type Information Record
 */
typedef struct {
        unsigned fBitfield : 1; /* set if bit width is specified */
        unsigned continued : 1; /* indicates additional TQ info in next AUX */
        unsigned bt  : 6;       /* basic type */
        unsigned tq4 : 4;
        unsigned tq5 : 4;
        /* ---- 16 bit boundary ---- */
        unsigned tq0 : 4;
        unsigned tq1 : 4;       /* 6 type qualifiers - tqPtr, etc. */
        unsigned tq2 : 4;
        unsigned tq3 : 4;
        } TIR, *pTIR;
#define cbTIR sizeof(TIR)
#define tiNil ((pTIR)0)
#define itqMax 6

/*
 * Relative symbol record
 *
 * If the rfd field is 4095, the index field indexes into the global symbol
 *      table.
 */

typedef struct {
        unsigned        rfd : 12;    /* index into the file indirect table */
        unsigned        index : 20; /* index int sym/aux/iss tables */
        } RNDXR, *pRNDXR;
#define cbRNDXR sizeof(RNDXR)
#define rndxNil ((pRNDXR)0)

/* dense numbers or sometimes called block numbers are stored in this type,
 *      a rfd of 0xffffffff is an index into the global table.
 */
typedef struct {
        unsigned long   rfd;    /* index into the file table */
        unsigned long   index;  /* index int sym/aux/iss tables */
        } DNR, *pDNR;
#define cbDNR sizeof(DNR)
#define dnNil ((pDNR)0)



/*
 * Auxillary information occurs only if needed.
 * It ALWAYS occurs in this order when present.

            isymMac             used by stProc only
            TIR                 type info
            TIR                 additional TQ info (if first TIR was not enough)
            rndx                if (bt == btStruct,btUnion,btEnum,btSet,btRange,
                                    btTypedef):
                                    rsym.index == iaux for btSet or btRange
                                    else rsym.index == isym
            dimLow              btRange, btSet
            dimMac              btRange, btSet
            rndx0               As many as there are tq arrays
            dimLow0
            dimHigh0
            ...
            rndxMax-1
            dimLowMax-1
            dimHighMax-1
            width in bits       if (bit field), width in bits.
 */
#define cAuxMax (6 + (idimMax*3))

/* a union of all possible info in the AUX universe */
typedef union {
        TIR     ti;             /* type information record */
        RNDXR   rndx;           /* relative index into symbol table */
        long    dnLow;          /* low dimension */
        long    dnHigh;         /* high dimension */
        long    isym;           /* symbol table index (end of proc) */
        long    iss;            /* index into string space (not used) */
        long    width;          /* width for non-default sized struc fields */
        long    count;          /* count of ranges for variant arm */
        } AUXU, *pAUXU;
#define cbAUXU sizeof(AUXU)
#define auxNil ((pAUXU)0)
#define iauxNil -1


/*
 * Optimization symbols
 *
 * Optimization symbols contain some overlap information with the normal
 * symbol table. In particular, the proc information
 * is somewhat redundant but necessary to easily find the other information
 * present. 
 *
 * All of the offsets are relative to the beginning of the last otProc
 */

typedef struct {
        unsigned ot: 8;         /* optimization type */
        unsigned value: 24;     /* address where we are moving it to */
        RNDXR   rndx;           /* points to a symbol or opt entry */
        unsigned long   offset; /* relative offset this occured */
        } OPTR, *pOPTR;
#define optNil  ((pOPTR) 0)
#define cbOPTR sizeof(OPTR)
#define ioptNil -1

/*
 * File Indirect
 *
 * When a symbol is referenced across files the following procedure is used:
 *      1) use the file index to get the File indirect entry.
 *      2) use the file indirect entry to get the File descriptor.
 *      3) add the sym index to the base of that file's sym table
 *
 */

typedef long RFDT, *pRFDT;
#define cbRFDT sizeof(RFDT)
#define rfdNil  -1

/*
 * The file indirect table in the mips loader is known as an array of FITs.
 * This is done to keep the code in the loader readable in the area where
 * these tables are merged.  Note this is only a name change.
 */
typedef long FIT, *pFIT;
#define cbFIT   sizeof(FIT)
#define ifiNil  -1
#define fiNil   ((pFIT) 0)

#ifdef _LANGUAGE_PASCAL
#define ifdNil -1
#define ilnNil -1
#define ipdNil -1
#define ilineNil -1
#define isymNil -1
#define indexNil 16#fffff
#define issNil -1
#define issNull 0
#define itqMax 6
#define iauxNil -1
#define ioptNil -1
#define rfdNil -1
#define ifiNil -1
#endif  /* _LANGUAGE_PASCAL */


/* Dense numbers
 *
 * Rather than use file index, symbol index pairs to represent symbols
 *      and globals, we use dense number so that they can be easily embeded
 *      in intermediate code and the programs that process them can
 *      use direct access tabls instead of hash table (which would be
 *      necesary otherwise because of the sparse name space caused by
 *      file index, symbol index pairs. Dense number are represented
 *      by RNDXRs.
 */

/*
 * The following table defines the meaning of each SYM field as
 * a function of the "st". (scD/B == scData OR scBss)
 *
 * Note: the value "isymMac" is used by symbols that have the concept
 * of enclosing a block of related information.  This value is the
 * isym of the first symbol AFTER the end associated with the primary
 * symbol. For example if a procedure was at isym==90 and had an
 * isymMac==155, the associated end would be at isym==154, and the
 * symbol at 155 would probably (although not necessarily) be the
 * symbol for the next procedure.  This allows rapid skipping over
 * internal information of various sorts. "stEnd"s ALWAYS have the
 * isym of the primary symbol that started the block.
 * 

ST              SC      VALUE           INDEX
--------        ------  --------        ------
stFile          scText  address         isymMac
stLabel         scText  address         ---
stGlobal        scD/B   address         iaux
stStatic        scD/B   address         iaux
stParam         scAbs   offset          iaux
stLocal         scAbs   offset          iaux
stProc          scText  address         iaux    (isymMac is first AUX)
stStaticProc    scText  address         iaux    (isymMac is first AUX)

stMember        scNil   ordinal         ---     (if member of enum)
        (mipsread thinks the case below has a bit, not byte, offset.)
stMember        scNil   byte offset     iaux    (if member of struct/union)
stMember        scBits  bit offset      iaux    (bit field spec)

stBlock         scText  address         isymMac (text block)
        (the code seems to think that rather than scNil, we see scInfo for
         the two cases below.)
stBlock         scNil   cb              isymMac (struct/union member define)
stBlock         scNil   cMembers        isymMac (enum member define)

        (New types added by SGI to simplify things:)
stStruct        scInfo  cb              isymMac (struct type define)
stUnion         scInfo  cb              isymMac (union  type define)
stEnum          scInfo  cMembers        isymMac (enum   type define)

stEnd           scText  address         isymStart
stEnd           scNil   -------         isymStart (struct/union/enum)

stTypedef       scNil   -------         iaux
stRegReloc      sc???   value           old register number
stForward       sc???   new address     isym to original symbol

stConstant      scInfo  value           --- (scalar)
stConstant      scInfo  iss             --- (complex, e.g. string)

 *
 */
#endif