297 lines
8.3 KiB
C
Executable File
297 lines
8.3 KiB
C
Executable File
/*** coff information for 88k bcs */
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/********************** FILE HEADER **********************/
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struct filehdr {
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unsigned short f_magic; /* magic number */
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unsigned short f_nscns; /* number of sections */
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long f_timdat; /* time & date stamp */
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long f_symptr; /* file pointer to symtab */
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long f_nsyms; /* number of symtab entries */
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unsigned short f_opthdr; /* sizeof(optional hdr) */
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unsigned short f_flags; /* flags */
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};
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/* Bits for f_flags:
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* F_RELFLG relocation info stripped from file
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* F_EXEC file is executable (no unresolved externel references)
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* F_LNNO line nunbers stripped from file
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* F_LSYMS local symbols stripped from file
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* F_AR32WR file has byte ordering of an AR32WR machine (e.g. vax)
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*/
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#define F_RELFLG 0000001
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#define F_EXEC 0000002
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#define F_LNNO 0000004
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#define F_LSYMS 0000010
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#define F_AR32WR 0000400
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#define MC88MAGIC 0555 /* 88k BCS executable */
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#define MC88DMAGIC 0541 /* DG/UX executable */
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#define MC88BADMAG(x) (((x).f_magic!=MC88MAGIC) && ((x).f_magic!=MC88DMAGIC))
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#define FILHDR struct filehdr
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#define FILHSZ sizeof(FILHDR)
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/********************** AOUT "OPTIONAL HEADER" **********************/
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#define PAGEMAGIC3 0414 /* Split i&d, zero mapped */
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typedef struct aouthdr {
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short magic; /* type of file */
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short vstamp; /* version stamp */
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unsigned long tsize; /* text size in bytes, padded to FW bdry*/
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unsigned long dsize; /* initialized data " " */
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unsigned long bsize; /* uninitialized data " " */
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unsigned long entry; /* entry pt. */
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unsigned long text_start; /* base of text used for this file */
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unsigned long data_start; /* base of data used for this file */
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} AOUTHDR;
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/* compute size of a header */
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#define AOUTSZ (sizeof(AOUTHDR))
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/********************** STORAGE CLASSES **********************/
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#define C_EFCN -1 /* physical end of function */
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#define C_NULL 0
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#define C_AUTO 1 /* automatic variable */
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#define C_EXT 2 /* external symbol */
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#define C_STAT 3 /* static */
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#define C_REG 4 /* register variable */
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#define C_EXTDEF 5 /* external definition */
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#define C_LABEL 6 /* label */
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#define C_ULABEL 7 /* undefined label */
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#define C_MOS 8 /* member of structure */
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#define C_ARG 9 /* function argument */
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#define C_STRTAG 10 /* structure tag */
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#define C_MOU 11 /* member of union */
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#define C_UNTAG 12 /* union tag */
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#define C_TPDEF 13 /* type definition */
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#define C_USTATIC 14 /* undefined static */
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#define C_ENTAG 15 /* enumeration tag */
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#define C_MOE 16 /* member of enumeration */
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#define C_REGPARM 17 /* register parameter */
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#define C_FIELD 18 /* bit field */
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#define C_BLOCK 100 /* ".bb" or ".eb" */
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#define C_FCN 101 /* ".bf" or ".ef" */
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#define C_EOS 102 /* end of structure */
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#define C_FILE 103 /* file name */
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#define C_LINE 104 /* line # reformatted as symbol table entry */
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#define C_ALIAS 105 /* duplicate tag */
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#define C_HIDDEN 106 /* ext symbol in dmert public lib */
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#define C_SHADOW 107 /* shadow symbol */
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#define C_VERSION 108 /* coff version symbol */
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/********************** SECTION HEADER **********************/
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struct scnhdr {
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char s_name[8]; /* section name */
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long s_paddr; /* physical address, aliased s_nlib */
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long s_vaddr; /* virtual address */
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long s_size; /* section size */
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long s_scnptr; /* file ptr to raw data for section */
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long s_relptr; /* file ptr to relocation */
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long s_lnnoptr; /* file ptr to line numbers */
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long s_nreloc; /* number of relocation entries */
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long s_nlnno; /* number of line number entries*/
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long s_flags; /* flags */
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};
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/*
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* names of "special" sections
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*/
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#define _TEXT ".text"
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#define _DATA ".data"
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#define _BSS ".bss"
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/*
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* s_flags "type"
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*/
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#define STYP_TEXT 0x20 /* section contains text only */
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#define STYP_DATA 0x40 /* section contains data only */
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#define STYP_BSS 0x80 /* section contains bss only */
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#define SCNHDR struct scnhdr
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#define SCNHSZ sizeof(SCNHDR)
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/********************** LINE NUMBERS **********************/
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/* 1 line number entry for every "breakpointable" source line in a section.
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* Line numbers are grouped on a per function basis; first entry in a function
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* grouping will have l_lnno = 0 and in place of physical address will be the
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* symbol table index of the function name.
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*/
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struct lineno{
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union {
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long l_symndx; /* function name symbol index, iff l_lnno == 0*/
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long l_paddr; /* (physical) address of line number */
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} l_addr;
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long l_lnno;
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};
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#define LINENO struct lineno
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#define LINESZ sizeof(LINENO)
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/********************** SYMBOLS **********************/
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#define SYMNMLEN 8 /* # characters in a symbol name */
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#define FILNMLEN 14 /* # characters in a file name */
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#define DIMNUM 4 /* # array dimensions in auxiliary entry */
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struct syment {
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union {
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char _n_name[SYMNMLEN]; /* old COFF version */
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struct {
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long _n_zeroes; /* new == 0 */
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long _n_offset; /* offset into string table */
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} _n_n;
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char *_n_nptr[2]; /* allows for overlaying */
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} _n;
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long n_value; /* value of symbol */
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short n_scnum; /* section number */
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unsigned short n_type; /* type and derived type */
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char n_sclass; /* storage class */
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char n_numaux; /* number of aux. entries */
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char pad2[2]; /* force alignment */
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};
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#define n_name _n._n_name
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#define n_zeroes _n._n_n._n_zeroes
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#define n_offset _n._n_n._n_offset
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/*
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* Relocatable symbols have number of the section in which they are defined,
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* or one of the following:
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*/
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#define N_UNDEF 0 /* undefined symbol */
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#define N_ABS -1 /* value of symbol is absolute */
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#define N_DEBUG -2 /* debugging symbol -- symbol value is meaningless */
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/*
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* Type of a symbol, in low 4 bits of the word
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*/
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#define T_NULL 0
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#define T_VOID 1 /* function argument (only used by compiler) */
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#define T_CHAR 2 /* character */
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#define T_SHORT 3 /* short integer */
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#define T_INT 4 /* integer */
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#define T_LONG 5 /* long integer */
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#define T_FLOAT 6 /* floating point */
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#define T_DOUBLE 7 /* double word */
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#define T_STRUCT 8 /* structure */
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#define T_UNION 9 /* union */
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#define T_ENUM 10 /* enumeration */
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#define T_MOE 11 /* member of enumeration*/
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#define T_UCHAR 12 /* unsigned character */
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#define T_USHORT 13 /* unsigned short */
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#define T_UINT 14 /* unsigned integer */
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#define T_ULONG 15 /* unsigned long */
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/*
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* derived types
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*/
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#define DT_NON 0
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#define DT_PTR 1 /* pointer */
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#define DT_FCN 2 /* function */
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#define DT_ARY 3 /* array */
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#define N_BTMASK 017
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#define N_TMASK 060
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#define N_BTSHFT 4
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#define N_TSHIFT 2
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#define BTYPE(x) ((x) & N_BTMASK)
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#define ISPTR(x) (((x) & N_TMASK) == (DT_PTR << N_BTSHFT))
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#define ISFCN(x) (((x) & N_TMASK) == (DT_FCN << N_BTSHFT))
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#define ISARY(x) (((x) & N_TMASK) == (DT_ARY << N_BTSHFT))
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#define DECREF(x) ((((x)>>N_TSHIFT)&~N_BTMASK)|((x)&N_BTMASK))
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union auxent {
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struct {
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long x_tagndx; /* str, un, or enum tag indx */
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union {
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struct {
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unsigned long x_lnno; /* declaration line number */
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unsigned long x_size; /* str/union/array size */
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} x_lnsz;
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long x_fsize; /* size of function */
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} x_misc;
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union {
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struct { /* if ISFCN, tag, or .bb */
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long x_lnnoptr; /* ptr to fcn line # */
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long x_endndx; /* entry ndx past block end */
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} x_fcn;
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struct { /* if ISARY, up to 4 dimen. */
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unsigned short x_dimen[DIMNUM];
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} x_ary;
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} x_fcnary;
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unsigned short x_tvndx; /* tv index */
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} x_sym;
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union {
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char x_fname[FILNMLEN];
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struct {
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long x_zeroes;
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long x_offset;
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} x_n;
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} x_file;
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struct {
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long x_scnlen; /* section length */
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unsigned long x_nreloc; /* # relocation entries */
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unsigned long x_nlinno; /* # line numbers */
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} x_scn;
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};
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#define SYMENT struct syment
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#define SYMESZ sizeof(SYMENT)
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#define AUXENT union auxent
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#define AUXESZ sizeof(AUXENT)
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/********************** RELOCATION DIRECTIVES **********************/
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struct reloc {
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long r_vaddr; /* Virtual address of reference */
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long r_symndx; /* Index into symbol table */
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unsigned short r_type; /* Relocation type */
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unsigned short r_offset;/* Hi 16 bits of constant */
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};
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/* Only values of r_type GNU/88k cares about */
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#define R_PCR16L 128
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#define R_PCR26L 129
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#define R_VRT16 130
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#define R_HVRT16 131
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#define R_LVRT16 132
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#define R_VRT32 133
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#define RELOC struct reloc
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#define RELSZ sizeof(RELOC)
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#define DEFAULT_SECTION_ALIGNMENT 8 /* double word */
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