118 lines
4.2 KiB
C
118 lines
4.2 KiB
C
/* 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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#ifndef _RDOFF_H
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#define _RDOFF_H "RDOFF1 support routines v0.1"
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typedef short int16; /* not sure if this will be required to be altered
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at all... best to typedef it just in case */
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/* the records that can be found in the RDOFF header */
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struct RelocRec {
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char type; /* must be 1 */
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char 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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long offset; /* from start of segment in which reference is loc'd */
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char length; /* 1 2 or 4 bytes */
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int16 refseg; /* segment to which reference refers to */
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};
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struct ImportRec {
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char type; /* must be 2 */
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int16 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[33]; /* zero terminated... should be written to file until
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the zero, but not after it - max len = 32 chars */
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};
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struct ExportRec {
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char type; /* must be 3 */
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char segment; /* segment referred to (0/1) */
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long offset; /* offset within segment */
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char label[33]; /* zero terminated as above. max len = 32 chars */
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};
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struct DLLRec {
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char type; /* must be 4 */
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char libname[128]; /* name of library to link with at load time */
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};
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struct BSSRec {
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char type; /* must be 5 */
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long amount; /* number of bytes BSS to reserve */
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};
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typedef union RDFHeaderRec {
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char type; /* invariant throughout all below */
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struct RelocRec r; /* type == 1 */
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struct ImportRec i; /* type == 2 */
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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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} rdfheaderrec;
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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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long header_len;
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long code_len;
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long data_len;
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long header_ofs;
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long code_ofs;
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long data_ofs;
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char *header_loc; /* keep location of header */
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long header_fp; /* current location within header for reading */
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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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char buffer[BUF_BLOCK_LEN];
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struct memorybuffer *next;
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} memorybuffer;
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typedef memorybuffer 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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/* 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, char *name);
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int rdfclose(rdffile *f);
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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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rdfwriteheader to write 'RDOFF1', length of header, and the header itself
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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 rdfwriteheader(FILE *fp,rdf_headerbuf *h);
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void rdfdoneheader(rdf_headerbuf *h);
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#endif /* _RDOFF_H */
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