391 lines
16 KiB
C
391 lines
16 KiB
C
/**************************************************************************/
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/* COFF.H */
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/* COFF data structures and related definitions used by the linker */
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/**************************************************************************/
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# include <stdint.h>
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/*------------------------------------------------------------------------*/
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/* COFF FILE HEADER */
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/*------------------------------------------------------------------------*/
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typedef struct filehdr
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{
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uint16_t f_magic;
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uint16_t f_nscns;
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int32_t f_timdat;
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int32_t f_symptr;
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int32_t f_nsyms;
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uint16_t f_opthdr;
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uint16_t f_flags;
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} FILHDR;
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# define FILHSZ sizeof(FILHDR)
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# define F_MACH_I386 0x14c
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# define F_RELFLG 0x0001
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# define F_EXEC 0x0002
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# define F_LNNO 0x0004
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# define F_LSYMS 0x0008
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# define F_LITTLE 0x0100
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# define F_BIG 0x0200
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# define F_SYMMERGE 0x1000
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/*------------------------------------------------------------------------*/
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/* OPTIONAL FILE HEADER */
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/*------------------------------------------------------------------------*/
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typedef struct aouthdr
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{
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int16_t magic;
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int16_t vstamp;
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int32_t tsize;
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int32_t dsize;
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int32_t bsize;
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int32_t entry;
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int32_t text_start;
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int32_t data_start;
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} AOUTHDR;
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# define AOUTHSZ sizeof(AOUTHDR)
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# define OMAGIC 0404
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# define NMAGIC 0410
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# define ZMAGIC 0413
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# define STMAGIC 0401
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# define SHMAGIC 0443
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/*------------------------------------------------------------------------*/
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/* COMMON ARCHIVE FILE STRUCTURES */
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/* */
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/* ARCHIVE File Organization: */
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/* _______________________________________________ */
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/* |__________ARCHIVE_MAGIC_STRING_______________| */
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/* |__________ARCHIVE_FILE_MEMBER_1______________| */
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/* | | */
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/* | Archive File Header "ar_hdr" | */
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/* |.............................................| */
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/* | Member Contents | */
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/* | 1. External symbol directory | */
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/* | 2. Text file | */
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/* |_____________________________________________| */
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/* |________ARCHIVE_FILE_MEMBER_2________________| */
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/* | "ar_hdr" | */
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/* |.............................................| */
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/* | Member Contents (.o or text file) | */
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/* |_____________________________________________| */
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/* | . . . | */
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/* | . . . | */
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/* | . . . | */
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/* |_____________________________________________| */
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/* |________ARCHIVE_FILE_MEMBER_n________________| */
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/* | "ar_hdr" | */
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/* |.............................................| */
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/* | Member Contents | */
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/* |_____________________________________________| */
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/* */
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/*------------------------------------------------------------------------*/
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#define COFF_ARMAG "!<arch>\n"
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#define SARMAG 8
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#define ARFMAG "`\n"
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struct ar_hdr /* archive file member header - printable ascii */
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{
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char ar_name[16]; /* file member name - `/' terminated */
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char ar_date[12]; /* file member date - decimal */
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char ar_uid[6]; /* file member user id - decimal */
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char ar_gid[6]; /* file member group id - decimal */
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char ar_mode[8]; /* file member mode - octal */
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char ar_size[10]; /* file member size - decimal */
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char ar_fmag[2]; /* ARFMAG - string to end header */
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};
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/*------------------------------------------------------------------------*/
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/* SECTION HEADER */
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/*------------------------------------------------------------------------*/
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typedef struct scnhdr
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{
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int8_t s_name[8];
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int32_t s_paddr;
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int32_t s_vaddr;
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int32_t s_size;
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int32_t s_scnptr;
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int32_t s_relptr;
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int32_t s_lnnoptr;
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uint16_t s_nreloc;
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uint16_t s_nlnno;
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int32_t s_flags;
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} __attribute__((packed)) SCNHDR;
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# define SCNHSZ sizeof(SCNHDR)
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/*------------------------------------------------------------------------*/
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/* The low 4 bits of s_flags is used as a section "type" */
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/*------------------------------------------------------------------------*/
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# define STYP_REG 0x000 /* "regular" : allocated, relocated, loaded */
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# define STYP_DSECT 0x001 /* "dummy" : not allocated, relocated, not loaded */
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# define STYP_NOLOAD 0x002 /* "noload" : allocated, relocated, not loaded */
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# define STYP_GROUP 0x004 /* "grouped" : formed of input sections */
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# define STYP_PAD 0x008 /* "padding" : not allocated, not relocated, loaded */
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# define STYP_COPY 0x010 /* "copy" : used for C init tables */
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# define STYP_TEXT 0x020 /* section contains text only */
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# define STYP_DATA 0x040 /* section contains data only */
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# define STYP_BSS 0x080 /* section contains bss only */
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# define STYP_INFO 0x200
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# define STYP_OVER 0x400
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# define STYP_LIB 0x800
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/*------------------------------------------------------------------------*/
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/* Define constants for 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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#define _CINIT ".cinit"
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#define _TV ".tv"
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/*------------------------------------------------------------------------*/
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/* RELOCATION ENTRIES */
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/*------------------------------------------------------------------------*/
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typedef struct reloc
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{
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uint32_t r_vaddr; /* address of reference */
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uint32_t r_symndx; /* symbol address */
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uint16_t r_type; /* relocation type */
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} __attribute__((packed)) RELOC;
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# define RELSZ 10
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/*--------------------------------------------------------------------------*/
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/* define all relocation types */
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/*--------------------------------------------------------------------------*/
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# define R_ABS 0x00 /* absolute address - no relocation */
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# define R_DIR32 0x06 /* */
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# define R_DIR32NB 0x07 /* */
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# define R_SECREL 0x0B
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# define R_REL32 0x24 /* 32 bits, PC-relative */
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/*------------------------------------------------------------------------*/
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/* LINE NUMBER ENTRIES */
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/*------------------------------------------------------------------------*/
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struct lineno
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{
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union
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{
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long l_symndx ; /* sym. table index of function name
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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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unsigned short l_lnno ; /* line number */
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};
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#define LINENO struct lineno
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#define LINESZ 6 /* sizeof(LINENO) */
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/*------------------------------------------------------------------------*/
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/* STORAGE CLASSES */
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/*------------------------------------------------------------------------*/
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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 /* dummy sclass for line number entry */
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#define C_ALIAS 105 /* duplicate tag */
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#define C_HIDDEN 106 /* special storage class for external */
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/*------------------------------------------------------------------------*/
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/* SYMBOL TABLE ENTRIES */
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/*------------------------------------------------------------------------*/
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#define SYMNMLEN 8 /* Number of characters in a symbol name */
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#define FILNMLEN 14 /* Number of characters in a file name */
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#define DIMNUM 4 /* Number of array dimensions in auxiliary entry */
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typedef struct syment
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{
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union
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{
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char _n_name[SYMNMLEN]; /* symbol name */
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struct
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{
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int32_t _n_zeroes; /* symbol name */
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int32_t _n_offset; /* loc in str table */
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} _n_n;
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uint32_t _n_nptr[2];
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} _n;
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uint32_t n_value;
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int16_t n_scnum;
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uint16_t n_type;
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int8_t n_sclass;
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int8_t n_numaux;
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} __attribute__((packed)) SYMENT;
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# define SYMESZ 18
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#define n_name _n._n_name
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#define n_nptr _n._n_nptr[1]
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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 a section number of the */
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/* section in which they are defined. Otherwise, section */
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/* numbers have the following meanings: */
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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 /* special debugging symbol */
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#define N_TV (unsigned short)-3 /* needs transfer vector (preload) */
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#define P_TV (unsigned short)-4 /* needs transfer vector (postload) */
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/*------------------------------------------------------------------------*/
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/* The fundamental type of a symbol packed into the low */
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/* 4 bits of the word. */
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/*------------------------------------------------------------------------*/
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#define _EF ".ef"
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#define T_NULL 0 /* no type info */
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#define T_ARG 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 are: */
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/*------------------------------------------------------------------------*/
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#define DT_NON 0 /* no derived type */
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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 MKTYPE(basic, d1,d2,d3,d4,d5,d6) \
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((basic) | ((d1) << 4) | ((d2) << 6) | ((d3) << 8) |\
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((d4) << 10) | ((d5) << 12) | ((d6) << 14))
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/*------------------------------------------------------------------------*/
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/* type packing constants and macros */
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/*------------------------------------------------------------------------*/
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#define N_BTMASK_COFF 017
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#define N_TMASK_COFF 060
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#define N_TMASK1_COFF 0300
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#define N_TMASK2_COFF 0360
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#define N_BTSHFT_COFF 4
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#define N_TSHIFT_COFF 2
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#define BTYPE_COFF(x) ((x) & N_BTMASK_COFF)
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#define ISINT(x) (((x) >= T_CHAR && (x) <= T_LONG) || \
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((x) >= T_UCHAR && (x) <= T_ULONG) || (x) == T_ENUM)
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#define ISFLT_COFF(x) ((x) == T_DOUBLE || (x) == T_FLOAT)
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#define ISPTR_COFF(x) (((x) & N_TMASK_COFF) == (DT_PTR << N_BTSHFT_COFF))
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#define ISFCN_COFF(x) (((x) & N_TMASK_COFF) == (DT_FCN << N_BTSHFT_COFF))
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#define ISARY_COFF(x) (((x) & N_TMASK_COFF) == (DT_ARY << N_BTSHFT_COFF))
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#define ISTAG_COFF(x) ((x)==C_STRTAG || (x)==C_UNTAG || (x)==C_ENTAG)
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#define INCREF_COFF(x) ((((x)&~N_BTMASK_COFF)<<N_TSHIFT_COFF)|(DT_PTR<<N_BTSHFT_COFF)|(x&N_BTMASK_COFF))
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#define DECREF_COFF(x) ((((x)>>N_TSHIFT_COFF)&~N_BTMASK_COFF)|((x)&N_BTMASK_COFF))
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/*------------------------------------------------------------------------*/
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/* AUXILIARY SYMBOL ENTRY */
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/*------------------------------------------------------------------------*/
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union auxent
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{
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struct
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{
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long x_tagndx; /* str, un, or enum tag indx */
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union
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{
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struct
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{
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unsigned short x_lnno; /* declaration line number */
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unsigned short 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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{
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struct /* if ISFCN, tag, or .bb */
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{
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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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{
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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_regcount; /* number of registers used by func */
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} x_sym;
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struct
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{
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char x_fname[FILNMLEN];
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} x_file;
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struct
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{
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long x_scnlen; /* section length */
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unsigned short x_nreloc; /* number of relocation entries */
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unsigned short x_nlinno; /* number of line numbers */
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} x_scn;
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};
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#define AUXENT union auxent
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#define AUXESZ 18 /* sizeof(AUXENT) */
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/*------------------------------------------------------------------------*/
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/* NAMES OF "SPECIAL" SYMBOLS */
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/*------------------------------------------------------------------------*/
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#define _STEXT ".text"
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#define _ETEXT "etext"
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#define _SDATA ".data"
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#define _EDATA "edata"
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#define _SBSS ".bss"
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#define _END "end"
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#define _CINITPTR "cinit"
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/*--------------------------------------------------------------------------*/
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/* ENTRY POINT SYMBOLS */
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/*--------------------------------------------------------------------------*/
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#define _START "_start"
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#define _MAIN "_main"
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/* _CSTART "_c_int00" (defined in params.h) */
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#define _TVORIG "_tvorig"
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#define _TORIGIN "_torigin"
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#define _DORIGIN "_dorigin"
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#define _SORIGIN "_sorigin"
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