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485 lines
16 KiB
C
485 lines
16 KiB
C
/* Declarations of internal format of MIPS ECOFF symbols.
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Originally contributed by MIPS Computer Systems and Third Eye Software.
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Changes contributed by Cygnus Support are in the public domain.
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This file is just aggregated with the files that make up the GNU
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release; it is not considered part of GAS, GDB, or other GNU
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programs. */
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/*
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* |-----------------------------------------------------------|
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* | Copyright (c) 1992, 1991, 1990 MIPS Computer Systems, Inc.|
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* | MIPS Computer Systems, Inc. grants reproduction and use |
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* | rights to all parties, PROVIDED that this comment is |
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* | maintained in the copy. |
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* |-----------------------------------------------------------|
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*/
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#ifndef _SYM_H
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#define _SYM_H
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/* (C) Copyright 1984 by Third Eye Software, Inc.
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*
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* Third Eye Software, Inc. grants reproduction and use rights to
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* all parties, PROVIDED that this comment is maintained in the copy.
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*
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* Third Eye makes no claims about the applicability of this
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* symbol table to a particular use.
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*/
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/*
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* This file contains the definition of the Third Eye Symbol Table.
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*
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* Symbols are assumed to be in 'encounter order' - i.e. the order that
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* the things they represent were encountered by the compiler/assembler/loader.
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* EXCEPT for globals! These are assumed to be bunched together,
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* probably right after the last 'normal' symbol. Globals ARE sorted
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* in ascending order.
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*
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* -----------------------------------------------------------------------
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* A brief word about Third Eye naming/use conventions:
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*
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* All arrays and index's are 0 based.
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* All "ifooMax" values are the highest legal value PLUS ONE. This makes
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* them good for allocating arrays, etc. All checks are "ifoo < ifooMax".
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*
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* "isym" Index into the SYMbol table.
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* "ipd" Index into the Procedure Descriptor array.
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* "ifd" Index into the File Descriptor array.
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* "iss" Index into String Space.
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* "cb" Count of Bytes.
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* "rgPd" array whose domain is "0..ipdMax-1" and RanGe is PDR.
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* "rgFd" array whose domain is "0..ifdMax-1" and RanGe is FDR.
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*/
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/*
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* Symbolic Header (HDR) structure.
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* As long as all the pointers are set correctly,
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* we don't care WHAT order the various sections come out in!
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*
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* A file produced solely for the use of CDB will probably NOT have
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* any instructions or data areas in it, as these are available
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* in the original.
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*/
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typedef struct {
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short magic; /* to verify validity of the table */
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short vstamp; /* version stamp */
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long ilineMax; /* number of line number entries */
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bfd_vma cbLine; /* number of bytes for line number entries */
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bfd_vma cbLineOffset; /* offset to start of line number entries*/
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long idnMax; /* max index into dense number table */
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bfd_vma cbDnOffset; /* offset to start dense number table */
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long ipdMax; /* number of procedures */
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bfd_vma cbPdOffset; /* offset to procedure descriptor table */
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long isymMax; /* number of local symbols */
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bfd_vma cbSymOffset; /* offset to start of local symbols*/
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long ioptMax; /* max index into optimization symbol entries */
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bfd_vma cbOptOffset; /* offset to optimization symbol entries */
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long iauxMax; /* number of auxillary symbol entries */
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bfd_vma cbAuxOffset; /* offset to start of auxillary symbol entries*/
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long issMax; /* max index into local strings */
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bfd_vma cbSsOffset; /* offset to start of local strings */
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long issExtMax; /* max index into external strings */
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bfd_vma cbSsExtOffset; /* offset to start of external strings */
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long ifdMax; /* number of file descriptor entries */
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bfd_vma cbFdOffset; /* offset to file descriptor table */
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long crfd; /* number of relative file descriptor entries */
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bfd_vma cbRfdOffset; /* offset to relative file descriptor table */
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long iextMax; /* max index into external symbols */
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bfd_vma cbExtOffset; /* offset to start of external symbol entries*/
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/* If you add machine dependent fields, add them here */
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} HDRR, *pHDRR;
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#define cbHDRR sizeof(HDRR)
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#define hdrNil ((pHDRR)0)
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/*
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* The FDR and PDR structures speed mapping of address <-> name.
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* They are sorted in ascending memory order and are kept in
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* memory by CDB at runtime.
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*/
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/*
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* File Descriptor
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*
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* There is one of these for EVERY FILE, whether compiled with
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* full debugging symbols or not. The name of a file should be
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* the path name given to the compiler. This allows the user
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* to simply specify the names of the directories where the COMPILES
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* were done, and we will be able to find their files.
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* A field whose comment starts with "R - " indicates that it will be
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* setup at runtime.
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*/
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typedef struct fdr {
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bfd_vma adr; /* memory address of beginning of file */
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long rss; /* file name (of source, if known) */
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long issBase; /* file's string space */
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bfd_vma cbSs; /* number of bytes in the ss */
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long isymBase; /* beginning of symbols */
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long csym; /* count file's of symbols */
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long ilineBase; /* file's line symbols */
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long cline; /* count of file's line symbols */
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long ioptBase; /* file's optimization entries */
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long copt; /* count of file's optimization entries */
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unsigned short ipdFirst;/* start of procedures for this file */
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short cpd; /* count of procedures for this file */
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long iauxBase; /* file's auxiliary entries */
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long caux; /* count of file's auxiliary entries */
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long rfdBase; /* index into the file indirect table */
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long crfd; /* count file indirect entries */
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unsigned lang: 5; /* language for this file */
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unsigned fMerge : 1; /* whether this file can be merged */
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unsigned fReadin : 1; /* true if it was read in (not just created) */
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unsigned fBigendian : 1;/* if set, was compiled on big endian machine */
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/* aux's will be in compile host's sex */
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unsigned glevel : 2; /* level this file was compiled with */
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unsigned reserved : 22; /* reserved for future use */
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bfd_vma cbLineOffset; /* byte offset from header for this file ln's */
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bfd_vma cbLine; /* size of lines for this file */
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} FDR, *pFDR;
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#define cbFDR sizeof(FDR)
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#define fdNil ((pFDR)0)
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#define ifdNil -1
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#define ifdTemp 0
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#define ilnNil -1
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/*
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* Procedure Descriptor
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*
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* There is one of these for EVERY TEXT LABEL.
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* If a procedure is in a file with full symbols, then isym
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* will point to the PROC symbols, else it will point to the
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* global symbol for the label.
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*/
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typedef struct pdr {
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bfd_vma adr; /* memory address of start of procedure */
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long isym; /* start of local symbol entries */
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long iline; /* start of line number entries*/
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long regmask; /* save register mask */
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long regoffset; /* save register offset */
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long iopt; /* start of optimization symbol entries*/
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long fregmask; /* save floating point register mask */
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long fregoffset; /* save floating point register offset */
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long frameoffset; /* frame size */
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short framereg; /* frame pointer register */
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short pcreg; /* offset or reg of return pc */
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long lnLow; /* lowest line in the procedure */
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long lnHigh; /* highest line in the procedure */
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bfd_vma cbLineOffset; /* byte offset for this procedure from the fd base */
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/* These fields are new for 64 bit ECOFF. */
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unsigned gp_prologue : 8; /* byte size of GP prologue */
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unsigned gp_used : 1; /* true if the procedure uses GP */
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unsigned reg_frame : 1; /* true if register frame procedure */
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unsigned prof : 1; /* true if compiled with -pg */
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unsigned reserved : 13; /* reserved: must be zero */
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unsigned localoff : 8; /* offset of local variables from vfp */
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} PDR, *pPDR;
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#define cbPDR sizeof(PDR)
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#define pdNil ((pPDR) 0)
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#define ipdNil -1
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/*
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* The structure of the runtime procedure descriptor created by the loader
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* for use by the static exception system.
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*/
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/*
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* If 0'd out because exception_info chokes Visual C++ and because there
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* don't seem to be any references to this structure elsewhere in gdb.
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*/
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#if 0
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typedef struct runtime_pdr {
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bfd_vma adr; /* memory address of start of procedure */
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long regmask; /* save register mask */
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long regoffset; /* save register offset */
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long fregmask; /* save floating point register mask */
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long fregoffset; /* save floating point register offset */
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long frameoffset; /* frame size */
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short framereg; /* frame pointer register */
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short pcreg; /* offset or reg of return pc */
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long irpss; /* index into the runtime string table */
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long reserved;
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struct exception_info *exception_info;/* pointer to exception array */
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} RPDR, *pRPDR;
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#define cbRPDR sizeof(RPDR)
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#define rpdNil ((pRPDR) 0)
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#endif
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/*
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* Line Numbers
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*
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* Line Numbers are segregated from the normal symbols because they
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* are [1] smaller , [2] are of no interest to your
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* average loader, and [3] are never needed in the middle of normal
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* scanning and therefore slow things down.
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*
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* By definition, the first LINER for any given procedure will have
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* the first line of a procedure and represent the first address.
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*/
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typedef long LINER, *pLINER;
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#define lineNil ((pLINER)0)
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#define cbLINER sizeof(LINER)
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#define ilineNil -1
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/*
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* The Symbol Structure (GFW, to those who Know!)
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*/
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typedef struct {
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long iss; /* index into String Space of name */
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bfd_vma value; /* value of symbol */
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unsigned st : 6; /* symbol type */
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unsigned sc : 5; /* storage class - text, data, etc */
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unsigned reserved : 1; /* reserved */
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unsigned index : 20; /* index into sym/aux table */
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} SYMR, *pSYMR;
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#define symNil ((pSYMR)0)
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#define cbSYMR sizeof(SYMR)
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#define isymNil -1
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#define indexNil 0xfffff
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#define issNil -1
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#define issNull 0
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/* The following converts a memory resident string to an iss.
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* This hack is recognized in SbFIss, in sym.c of the debugger.
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*/
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#define IssFSb(sb) (0x80000000 | ((unsigned long)(sb)))
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/* E X T E R N A L S Y M B O L R E C O R D
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*
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* Same as the SYMR except it contains file context to determine where
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* the index is.
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*/
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typedef struct ecoff_extr {
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unsigned jmptbl:1; /* symbol is a jump table entry for shlibs */
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unsigned cobol_main:1; /* symbol is a cobol main procedure */
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unsigned weakext:1; /* symbol is weak external */
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unsigned reserved:13; /* reserved for future use */
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int ifd; /* where the iss and index fields point into */
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SYMR asym; /* symbol for the external */
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} EXTR, *pEXTR;
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#define extNil ((pEXTR)0)
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#define cbEXTR sizeof(EXTR)
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/* A U X I L L A R Y T Y P E I N F O R M A T I O N */
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/*
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* Type Information Record
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*/
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typedef struct {
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unsigned fBitfield : 1; /* set if bit width is specified */
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unsigned continued : 1; /* indicates additional TQ info in next AUX */
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unsigned bt : 6; /* basic type */
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unsigned tq4 : 4;
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unsigned tq5 : 4;
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/* ---- 16 bit boundary ---- */
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unsigned tq0 : 4;
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unsigned tq1 : 4; /* 6 type qualifiers - tqPtr, etc. */
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unsigned tq2 : 4;
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unsigned tq3 : 4;
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} TIR, *pTIR;
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#define cbTIR sizeof(TIR)
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#define tiNil ((pTIR)0)
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#define itqMax 6
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/*
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* Relative symbol record
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*
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* If the rfd field is 4095, the index field indexes into the global symbol
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* table.
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*/
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typedef struct {
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unsigned rfd : 12; /* index into the file indirect table */
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unsigned index : 20; /* index int sym/aux/iss tables */
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} RNDXR, *pRNDXR;
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#define cbRNDXR sizeof(RNDXR)
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#define rndxNil ((pRNDXR)0)
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/* dense numbers or sometimes called block numbers are stored in this type,
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* a rfd of 0xffffffff is an index into the global table.
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*/
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typedef struct {
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unsigned long rfd; /* index into the file table */
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unsigned long index; /* index int sym/aux/iss tables */
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} DNR, *pDNR;
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#define cbDNR sizeof(DNR)
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#define dnNil ((pDNR)0)
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/*
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* Auxillary information occurs only if needed.
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* It ALWAYS occurs in this order when present.
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isymMac used by stProc only
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TIR type info
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TIR additional TQ info (if first TIR was not enough)
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rndx if (bt == btStruct,btUnion,btEnum,btSet,btRange,
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btTypedef):
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rsym.index == iaux for btSet or btRange
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else rsym.index == isym
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dimLow btRange, btSet
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dimMac btRange, btSet
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rndx0 As many as there are tq arrays
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dimLow0
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dimHigh0
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...
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rndxMax-1
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dimLowMax-1
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dimHighMax-1
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width in bits if (bit field), width in bits.
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*/
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#define cAuxMax (6 + (idimMax*3))
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/* a union of all possible info in the AUX universe */
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typedef union {
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TIR ti; /* type information record */
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RNDXR rndx; /* relative index into symbol table */
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long dnLow; /* low dimension */
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long dnHigh; /* high dimension */
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long isym; /* symbol table index (end of proc) */
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long iss; /* index into string space (not used) */
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long width; /* width for non-default sized struc fields */
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long count; /* count of ranges for variant arm */
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} AUXU, *pAUXU;
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#define cbAUXU sizeof(AUXU)
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#define auxNil ((pAUXU)0)
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#define iauxNil -1
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/*
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* Optimization symbols
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*
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* Optimization symbols contain some overlap information with the normal
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* symbol table. In particular, the proc information
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* is somewhat redundant but necessary to easily find the other information
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* present.
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*
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* All of the offsets are relative to the beginning of the last otProc
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*/
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typedef struct {
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unsigned ot: 8; /* optimization type */
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unsigned value: 24; /* address where we are moving it to */
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RNDXR rndx; /* points to a symbol or opt entry */
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unsigned long offset; /* relative offset this occured */
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} OPTR, *pOPTR;
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#define optNil ((pOPTR) 0)
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#define cbOPTR sizeof(OPTR)
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#define ioptNil -1
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/*
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* File Indirect
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*
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* When a symbol is referenced across files the following procedure is used:
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* 1) use the file index to get the File indirect entry.
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* 2) use the file indirect entry to get the File descriptor.
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* 3) add the sym index to the base of that file's sym table
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*
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*/
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typedef long RFDT, *pRFDT;
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#define cbRFDT sizeof(RFDT)
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#define rfdNil -1
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/*
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* The file indirect table in the mips loader is known as an array of FITs.
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* This is done to keep the code in the loader readable in the area where
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* these tables are merged. Note this is only a name change.
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*/
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typedef long FIT, *pFIT;
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#define cbFIT sizeof(FIT)
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#define ifiNil -1
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#define fiNil ((pFIT) 0)
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#ifdef _LANGUAGE_PASCAL
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#define ifdNil -1
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#define ilnNil -1
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#define ipdNil -1
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#define ilineNil -1
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#define isymNil -1
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#define indexNil 16#fffff
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#define issNil -1
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#define issNull 0
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#define itqMax 6
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#define iauxNil -1
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#define ioptNil -1
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#define rfdNil -1
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#define ifiNil -1
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#endif /* _LANGUAGE_PASCAL */
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/* Dense numbers
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*
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* Rather than use file index, symbol index pairs to represent symbols
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* and globals, we use dense number so that they can be easily embeded
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* in intermediate code and the programs that process them can
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* use direct access tabls instead of hash table (which would be
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* necesary otherwise because of the sparse name space caused by
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* file index, symbol index pairs. Dense number are represented
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* by RNDXRs.
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*/
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/*
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* The following table defines the meaning of each SYM field as
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* a function of the "st". (scD/B == scData OR scBss)
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*
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* Note: the value "isymMac" is used by symbols that have the concept
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* of enclosing a block of related information. This value is the
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* isym of the first symbol AFTER the end associated with the primary
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* symbol. For example if a procedure was at isym==90 and had an
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* isymMac==155, the associated end would be at isym==154, and the
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* symbol at 155 would probably (although not necessarily) be the
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* symbol for the next procedure. This allows rapid skipping over
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* internal information of various sorts. "stEnd"s ALWAYS have the
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* isym of the primary symbol that started the block.
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*
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ST SC VALUE INDEX
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-------- ------ -------- ------
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stFile scText address isymMac
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stLabel scText address ---
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stGlobal scD/B address iaux
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stStatic scD/B address iaux
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stParam scAbs offset iaux
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stLocal scAbs offset iaux
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stProc scText address iaux (isymMac is first AUX)
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stStaticProc scText address iaux (isymMac is first AUX)
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stMember scNil ordinal --- (if member of enum)
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(mipsread thinks the case below has a bit, not byte, offset.)
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stMember scNil byte offset iaux (if member of struct/union)
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stMember scBits bit offset iaux (bit field spec)
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stBlock scText address isymMac (text block)
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(the code seems to think that rather than scNil, we see scInfo for
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the two cases below.)
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stBlock scNil cb isymMac (struct/union member define)
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stBlock scNil cMembers isymMac (enum member define)
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(New types added by SGI to simplify things:)
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stStruct scInfo cb isymMac (struct type define)
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stUnion scInfo cb isymMac (union type define)
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stEnum scInfo cMembers isymMac (enum type define)
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stEnd scText address isymStart
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stEnd scNil ------- isymStart (struct/union/enum)
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stTypedef scNil ------- iaux
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stRegReloc sc??? value old register number
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stForward sc??? new address isym to original symbol
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stConstant scInfo value --- (scalar)
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stConstant scInfo iss --- (complex, e.g. string)
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*
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*/
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#endif
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