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270 lines
8.7 KiB
C
270 lines
8.7 KiB
C
/*
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* rdoff.h RDOFF Object File manipulation routines header file
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*
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* The Netwide Assembler is copyright (C) 1996 Simon Tatham and
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* Julian Hall. All rights reserved. The software is
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* redistributable under the licence given in the file "Licence"
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* distributed in the NASM archive.
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*
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* Permission to use this file in your own projects is granted, as int32_t
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* as acknowledgement is given in an appropriate manner to its authors,
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* with instructions of how to obtain a copy via ftp.
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*/
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#ifndef RDOFF_RDOFF_H
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#define RDOFF_RDOFF_H 1
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#include <inttypes.h>
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/*
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* RDOFF definitions. They are used by RDOFF utilities and by NASM's
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* 'outrdf2.c' output module.
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*/
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/* RDOFF format revision (currently used only when printing the version) */
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#define RDOFF2_REVISION "0.6.1"
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/* RDOFF2 file signature */
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#define RDOFF2_SIGNATURE "RDOFF2"
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/* Maximum size of an import/export label (including trailing zero) */
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#define EXIM_LABEL_MAX 64
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/* Maximum size of library or module name (including trailing zero) */
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#define MODLIB_NAME_MAX 128
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/* Maximum number of segments that we can handle in one file */
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#define RDF_MAXSEGS 64
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/* Record types that may present the RDOFF header */
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#define RDFREC_GENERIC 0
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#define RDFREC_RELOC 1
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#define RDFREC_IMPORT 2
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#define RDFREC_GLOBAL 3
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#define RDFREC_DLL 4
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#define RDFREC_BSS 5
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#define RDFREC_SEGRELOC 6
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#define RDFREC_FARIMPORT 7
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#define RDFREC_MODNAME 8
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#define RDFREC_COMMON 10
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/*
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* Generic record - contains the type and length field, plus a 128 byte
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* array 'data'
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*/
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struct GenericRec {
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uint8_t type;
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uint8_t reclen;
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char data[128];
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};
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/*
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* Relocation record
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*/
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struct RelocRec {
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uint8_t type; /* must be 1 */
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uint8_t reclen; /* content length */
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uint8_t segment; /* only 0 for code, or 1 for data supported,
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but add 64 for relative refs (ie do not require
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reloc @ loadtime, only linkage) */
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int32_t offset; /* from start of segment in which reference is loc'd */
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uint8_t length; /* 1 2 or 4 bytes */
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uint16_t refseg; /* segment to which reference refers to */
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};
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/*
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* Extern/import record
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*/
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struct ImportRec {
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uint8_t type; /* must be 2 */
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uint8_t reclen; /* content length */
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uint8_t flags; /* SYM_* flags (see below) */
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uint16_t segment; /* segment number allocated to the label for reloc
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records - label is assumed to be at offset zero
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in this segment, so linker must fix up with offset
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of segment and of offset within segment */
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char label[EXIM_LABEL_MAX]; /* zero terminated, should be written to file
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until the zero, but not after it */
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};
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/*
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* Public/export record
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*/
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struct ExportRec {
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uint8_t type; /* must be 3 */
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uint8_t reclen; /* content length */
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uint8_t flags; /* SYM_* flags (see below) */
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uint8_t segment; /* segment referred to (0/1/2) */
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int32_t offset; /* offset within segment */
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char label[EXIM_LABEL_MAX]; /* zero terminated as in import */
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};
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/*
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* DLL record
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*/
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struct DLLRec {
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uint8_t type; /* must be 4 */
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uint8_t reclen; /* content length */
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char libname[MODLIB_NAME_MAX]; /* name of library to link with at load time */
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};
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/*
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* BSS record
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*/
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struct BSSRec {
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uint8_t type; /* must be 5 */
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uint8_t reclen; /* content length */
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int32_t amount; /* number of bytes BSS to reserve */
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};
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/*
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* Module name record
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*/
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struct ModRec {
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uint8_t type; /* must be 8 */
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uint8_t reclen; /* content length */
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char modname[MODLIB_NAME_MAX]; /* module name */
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};
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/*
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* Common variable record
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*/
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struct CommonRec {
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uint8_t type; /* must be 10 */
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uint8_t reclen; /* equals 7+label length */
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uint16_t segment; /* segment number */
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int32_t size; /* size of common variable */
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uint16_t align; /* alignment (power of two) */
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char label[EXIM_LABEL_MAX]; /* zero terminated as in import */
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};
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/* Flags for ExportRec */
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#define SYM_DATA 1
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#define SYM_FUNCTION 2
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#define SYM_GLOBAL 4
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#define SYM_IMPORT 8
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/*** The following part is used only by the utilities *************************/
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#ifdef RDOFF_UTILS
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/* Some systems don't define this automatically */
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#if !defined(strdup)
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extern char *strdup(const char *);
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#endif
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typedef union RDFHeaderRec {
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char type; /* invariant throughout all below */
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struct GenericRec g; /* type 0 */
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struct RelocRec r; /* type == 1 / 6 */
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struct ImportRec i; /* type == 2 / 7 */
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struct ExportRec e; /* type == 3 */
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struct DLLRec d; /* type == 4 */
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struct BSSRec b; /* type == 5 */
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struct ModRec m; /* type == 8 */
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struct CommonRec c; /* type == 10 */
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} rdfheaderrec;
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struct SegmentHeaderRec {
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/* information from file */
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uint16_t type;
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uint16_t number;
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uint16_t reserved;
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int32_t length;
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/* information built up here */
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int32_t offset;
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uint8_t *data; /* pointer to segment data if it exists in memory */
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};
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typedef struct RDFFileInfo {
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FILE *fp; /* file descriptor; must be open to use this struct */
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int rdoff_ver; /* should be 1; any higher => not guaranteed to work */
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int32_t header_len;
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int32_t header_ofs;
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uint8_t *header_loc; /* keep location of header */
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int32_t header_fp; /* current location within header for reading */
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struct SegmentHeaderRec seg[RDF_MAXSEGS];
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int nsegs;
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int32_t eof_offset; /* offset of the first uint8_t beyond the end of this
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module */
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char *name; /* name of module in libraries */
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int *refcount; /* pointer to reference count on file, or NULL */
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} rdffile;
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#define BUF_BLOCK_LEN 4088 /* selected to match page size (4096)
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* on 80x86 machines for efficiency */
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typedef struct memorybuffer {
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int length;
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uint8_t buffer[BUF_BLOCK_LEN];
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struct memorybuffer *next;
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} memorybuffer;
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typedef struct {
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memorybuffer *buf; /* buffer containing header records */
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int nsegments; /* number of segments to be written */
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int32_t seglength; /* total length of all the segments */
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} rdf_headerbuf;
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/* segments used by RDOFF, understood by rdoffloadseg */
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#define RDOFF_CODE 0
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#define RDOFF_DATA 1
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#define RDOFF_HEADER -1
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/* mask for 'segment' in relocation records to find if relative relocation */
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#define RDOFF_RELATIVEMASK 64
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/* mask to find actual segment value in relocation records */
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#define RDOFF_SEGMENTMASK 63
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extern int rdf_errno;
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/* rdf_errno can hold these error codes */
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enum {
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/* 0 */ RDF_OK,
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/* 1 */ RDF_ERR_OPEN,
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/* 2 */ RDF_ERR_FORMAT,
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/* 3 */ RDF_ERR_READ,
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/* 4 */ RDF_ERR_UNKNOWN,
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/* 5 */ RDF_ERR_HEADER,
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/* 6 */ RDF_ERR_NOMEM,
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/* 7 */ RDF_ERR_VER,
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/* 8 */ RDF_ERR_RECTYPE,
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/* 9 */ RDF_ERR_RECLEN,
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/* 10 */ RDF_ERR_SEGMENT
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};
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/* utility functions */
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int32_t translateint32_t(int32_t in);
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uint16_t translateint16_t(uint16_t in);
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char *translatesegmenttype(uint16_t type);
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/* RDOFF file manipulation functions */
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int rdfopen(rdffile * f, const char *name);
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int rdfopenhere(rdffile * f, FILE * fp, int *refcount, const char *name);
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int rdfclose(rdffile * f);
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int rdffindsegment(rdffile * f, int segno);
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int rdfloadseg(rdffile * f, int segment, void *buffer);
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rdfheaderrec *rdfgetheaderrec(rdffile * f); /* returns static storage */
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void rdfheaderrewind(rdffile * f); /* back to start of header */
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void rdfperror(const char *app, const char *name);
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/* functions to write a new RDOFF header to a file -
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use rdfnewheader to allocate a header, rdfaddheader to add records to it,
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rdfaddsegment to notify the header routines that a segment exists, and
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to tell it how int32_t the segment will be.
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rdfwriteheader to write the file id, object length, and header
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to a file, and then rdfdoneheader to dispose of the header */
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rdf_headerbuf *rdfnewheader(void);
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int rdfaddheader(rdf_headerbuf * h, rdfheaderrec * r);
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int rdfaddsegment(rdf_headerbuf * h, int32_t seglength);
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int rdfwriteheader(FILE * fp, rdf_headerbuf * h);
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void rdfdoneheader(rdf_headerbuf * h);
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#endif /* RDOFF_UTILS */
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#endif /* RDOFF_RDOFF_H */
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