+++ /dev/null
-/* ----------------------------------------------------------------------- *
- *
- * Copyright 1996-2009 The NASM Authors - All Rights Reserved
- * See the file AUTHORS included with the NASM distribution for
- * the specific copyright holders.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following
- * conditions are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
- * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * ----------------------------------------------------------------------- */
-
-/*
- * outrdf.c output routines for the Netwide Assembler to produce
- * RDOFF format object files (which are intended mainly
- * for use in proprietary projects, as the code to load and
- * execute them is very simple). They will also be used
- * for device drivers and possibly some executable files
- * in the MOSCOW operating system. See Rdoff.txt for
- * details.
- */
-
-#include "compiler.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <assert.h>
-
-#include "nasm.h"
-#include "nasmlib.h"
-#include "output/outform.h"
-
-/* VERBOSE_WARNINGS: define this to add some extra warnings... */
-#define VERBOSE_WARNINGS
-
-#ifdef OF_RDF
-
-typedef int16_t int16; /* not sure if this will be required to be altered
- at all... best to typedef it just in case */
-
-static const char *RDOFFId = "RDOFF1"; /* written to start of RDOFF files */
-
-/* the records that can be found in the RDOFF header */
-
-/* Note that whenever a segment is referred to in the RDOFF file, its number
- * is always half of the segment number that NASM uses to refer to it; this
- * is because NASM only allocates even numbered segments, so as to not
- * waste any of the 16 bits of segment number written to the file - this
- * allows up to 65533 external labels to be defined; otherwise it would be
- * 32764. */
-
-struct RelocRec {
- char type; /* must be 1 */
- char segment; /* only 0 for code, or 1 for data supported,
- * but add 64 for relative refs (ie do not require
- * reloc @ loadtime, only linkage) */
- int32_t offset; /* from start of segment in which reference is loc'd */
- char length; /* 1 2 or 4 bytes */
- int16 refseg; /* segment to which reference refers to */
-};
-
-struct ImportRec {
- char type; /* must be 2 */
- int16 segment; /* segment number allocated to the label for reloc
- * records - label is assumed to be at offset zero
- * in this segment, so linker must fix up with offset
- * of segment and of offset within segment */
- char label[33]; /* zero terminated... should be written to file until
- * the zero, but not after it - max len = 32 chars */
-};
-
-struct ExportRec {
- char type; /* must be 3 */
- char segment; /* segment referred to (0/1) */
- int32_t offset; /* offset within segment */
- char label[33]; /* zero terminated as above. max len = 32 chars */
-};
-
-struct DLLRec {
- char type; /* must be 4 */
- char libname[128]; /* name of library to link with at load time */
-};
-
-struct BSSRec {
- char type; /* must be 5 */
- int32_t amount; /* number of bytes BSS to reserve */
-};
-
-/* code for managing buffers needed to seperate code and data into individual
- * sections until they are ready to be written to the file.
- * We'd better hope that it all fits in memory else we're buggered... */
-
-#define BUF_BLOCK_LEN 4088 /* selected to match page size (4096)
- * on 80x86 machines for efficiency */
-
-typedef struct memorybuffer {
- int length;
- char buffer[BUF_BLOCK_LEN];
- struct memorybuffer *next;
-} memorybuffer;
-
-static memorybuffer *newmembuf(void)
-{
- memorybuffer *t;
-
- t = nasm_malloc(sizeof(memorybuffer));
-
- t->length = 0;
- t->next = NULL;
- return t;
-}
-
-static void membufwrite(memorybuffer * b, void *data, int bytes)
-{
- int16 w;
- int32_t l;
-
- if (b->next) { /* memory buffer full - use next buffer */
- membufwrite(b->next, data, bytes);
- return;
- }
- if ((bytes < 0 && b->length - bytes > BUF_BLOCK_LEN)
- || (bytes > 0 && b->length + bytes > BUF_BLOCK_LEN)) {
-
- /* buffer full and no next allocated... allocate and initialize next
- * buffer */
-
- b->next = newmembuf();
- membufwrite(b->next, data, bytes);
- return;
- }
-
- switch (bytes) {
- case -4: /* convert to little-endian */
- l = *(int32_t *)data;
- b->buffer[b->length++] = l & 0xFF;
- l >>= 8;
- b->buffer[b->length++] = l & 0xFF;
- l >>= 8;
- b->buffer[b->length++] = l & 0xFF;
- l >>= 8;
- b->buffer[b->length++] = l & 0xFF;
- break;
-
- case -2:
- w = *(int16 *) data;
- b->buffer[b->length++] = w & 0xFF;
- w >>= 8;
- b->buffer[b->length++] = w & 0xFF;
- break;
-
- default:
- while (bytes--) {
- b->buffer[b->length++] = *(*(uint8_t **)&data);
-
- (*(uint8_t **)&data)++;
- }
- break;
- }
-}
-
-static void membufdump(memorybuffer * b, FILE * fp)
-{
- if (!b)
- return;
-
- fwrite(b->buffer, 1, b->length, fp);
-
- membufdump(b->next, fp);
-}
-
-static int membuflength(memorybuffer * b)
-{
- if (!b)
- return 0;
- return b->length + membuflength(b->next);
-}
-
-static void freemembuf(memorybuffer * b)
-{
- if (!b)
- return;
- freemembuf(b->next);
- nasm_free(b);
-}
-
-/***********************************************************************
- * Actual code to deal with RDOFF ouput format begins here...
- */
-
-/* global variables set during the initialisation phase */
-
-static memorybuffer *seg[2]; /* seg 0 = code, seg 1 = data */
-static memorybuffer *header; /* relocation/import/export records */
-
-static FILE *ofile;
-
-static efunc error;
-
-static int segtext, segdata, segbss;
-static int32_t bsslength;
-
-static void rdf_init(FILE * fp, efunc errfunc, ldfunc ldef, evalfunc eval)
-{
- maxbits = 64;
- ofile = fp;
- error = errfunc;
- seg[0] = newmembuf();
- seg[1] = newmembuf();
- header = newmembuf();
- segtext = seg_alloc();
- segdata = seg_alloc();
- segbss = seg_alloc();
- if (segtext != 0 || segdata != 2 || segbss != 4)
- error(ERR_PANIC,
- "rdf segment numbers not allocated as expected (%d,%d,%d)",
- segtext, segdata, segbss);
- bsslength = 0;
-}
-
-static int32_t rdf_section_names(char *name, int pass, int *bits)
-{
- /*
- * Default is 32 bits.
- */
- if (!name)
- *bits = 32;
-
- if (!name)
- return 0;
- if (!strcmp(name, ".text"))
- return 0;
- else if (!strcmp(name, ".data"))
- return 2;
- else if (!strcmp(name, ".bss"))
- return 4;
- else
- return NO_SEG;
-}
-
-static void write_reloc_rec(struct RelocRec *r)
-{
- if (r->refseg != NO_SEG && (r->refseg & 1))
- error(ERR_NONFATAL, "RDF format does not support segment base"
- " references");
-
- r->refseg >>= 1; /* adjust segment nos to RDF rather than NASM */
-
- membufwrite(header, &r->type, 1);
- membufwrite(header, &r->segment, 1);
- membufwrite(header, &r->offset, -4);
- membufwrite(header, &r->length, 1);
- membufwrite(header, &r->refseg, -2); /* 9 bytes written */
-}
-
-static void write_export_rec(struct ExportRec *r)
-{
- r->segment >>= 1;
-
- membufwrite(header, &r->type, 1);
- membufwrite(header, &r->segment, 1);
- membufwrite(header, &r->offset, -4);
- membufwrite(header, r->label, strlen(r->label) + 1);
-}
-
-static void write_import_rec(struct ImportRec *r)
-{
- r->segment >>= 1;
-
- membufwrite(header, &r->type, 1);
- membufwrite(header, &r->segment, -2);
- membufwrite(header, r->label, strlen(r->label) + 1);
-}
-
-static void write_bss_rec(struct BSSRec *r)
-{
- membufwrite(header, &r->type, 1);
- membufwrite(header, &r->amount, -4);
-}
-
-static void write_dll_rec(struct DLLRec *r)
-{
- membufwrite(header, &r->type, 1);
- membufwrite(header, r->libname, strlen(r->libname) + 1);
-}
-
-static void rdf_deflabel(char *name, int32_t segment, int32_t offset,
- int is_global, char *special)
-{
- struct ExportRec r;
- struct ImportRec ri;
-#ifdef VERBOSE_WARNINGS
- static int warned_common = 0;
-#endif
-
- if (special)
- error(ERR_NONFATAL, "RDOFF format does not support any"
- " special symbol types");
-
- if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
- error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
- return;
- }
-
- if (is_global == 2) {
-#ifdef VERBOSE_WARNINGS
- if (!warned_common) {
- error(ERR_WARNING,
- "common declarations not supported: using extern");
- warned_common = 1;
- }
-#endif
- is_global = 1;
- }
-
- if (segment > 4) { /* EXTERN declaration */
- ri.type = 2;
- ri.segment = segment;
- strncpy(ri.label, name, 32);
- ri.label[32] = 0;
- write_import_rec(&ri);
- } else if (is_global) {
- r.type = 3;
- r.segment = segment;
- r.offset = offset;
- strncpy(r.label, name, 32);
- r.label[32] = 0;
- write_export_rec(&r);
- }
-}
-
-static void rdf_out(int32_t segto, void *data, uint32_t type,
- int32_t segment, int32_t wrt)
-{
- int32_t bytes = type & OUT_SIZMASK;
- struct RelocRec rr;
- uint8_t databuf[8], *pd;
-
- if (segto == NO_SEG) {
- if ((type & OUT_TYPMASK) != OUT_RESERVE)
- error(ERR_NONFATAL,
- "attempt to assemble code in ABSOLUTE space");
- return;
- }
-
- segto >>= 1; /* convert NASM segment no to RDF number */
-
- if (segto != 0 && segto != 1 && segto != 2) {
- error(ERR_NONFATAL,
- "specified segment not supported by rdf output format");
- return;
- }
-
- if (wrt != NO_SEG) {
- wrt = NO_SEG; /* continue to do _something_ */
- error(ERR_NONFATAL, "WRT not supported by rdf output format");
- }
-
- type &= OUT_TYPMASK;
-
- if (segto == 2 && type != OUT_RESERVE) {
- error(ERR_NONFATAL, "BSS segments may not be initialized");
-
- /* just reserve the space for now... */
-
- if (type == OUT_REL2ADR)
- bytes = 2;
- else
- bytes = 4;
- type = OUT_RESERVE;
- }
-
- if (type == OUT_RESERVE) {
- if (segto == 2) /* BSS segment space reserverd */
- bsslength += bytes;
- else
- while (bytes--)
- membufwrite(seg[segto], databuf, 1);
- } else if (type == OUT_RAWDATA) {
- if (segment != NO_SEG)
- error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
- membufwrite(seg[segto], data, bytes);
- } else if (type == OUT_ADDRESS) {
-
- /* if segment == NO_SEG then we are writing an address of an
- object within the same segment - do not produce reloc rec. */
-
- if (segment != NO_SEG) {
-
- /* it's an address, so we must write a relocation record */
-
- rr.type = 1; /* type signature */
- rr.segment = segto; /* segment we're currently in */
- rr.offset = membuflength(seg[segto]); /* current offset */
- rr.length = bytes; /* length of reference */
- rr.refseg = segment; /* segment referred to */
- write_reloc_rec(&rr);
- }
-
- pd = databuf; /* convert address to little-endian */
- WRITEADDR(pd, *(int64_t *)data, bytes);
- membufwrite(seg[segto], databuf, bytes);
- } else if (type == OUT_REL2ADR) {
- if (segment == segto)
- error(ERR_PANIC, "intra-segment OUT_REL2ADR");
- if (segment != NO_SEG && segment % 2) {
- error(ERR_NONFATAL,
- "rdf format does not support segment base refs");
- }
-
- rr.type = 1; /* type signature */
- rr.segment = segto + 64; /* segment we're currently in + rel flag */
- rr.offset = membuflength(seg[segto]); /* current offset */
- rr.length = 2; /* length of reference */
- rr.refseg = segment; /* segment referred to */
- write_reloc_rec(&rr);
-
- /* work out what to put in the code: offset of the end of this operand,
- * subtracted from any data specified, so that loader can just add
- * address of imported symbol onto it to get address relative to end of
- * instruction: import_address + data(offset) - end_of_instrn */
-
- rr.offset = *(int64_t *)data - (rr.offset + bytes);
-
- membufwrite(seg[segto], &rr.offset, -2);
- } else if (type == OUT_REL4ADR) {
- if ((segment == segto) && (globalbits != 64))
- error(ERR_PANIC, "intra-segment OUT_REL4ADR");
- if (segment != NO_SEG && segment % 2) {
- error(ERR_NONFATAL,
- "rdf format does not support segment base refs");
- }
-
- rr.type = 1; /* type signature */
- rr.segment = segto + 64; /* segment we're currently in + rel tag */
- rr.offset = membuflength(seg[segto]); /* current offset */
- rr.length = 4; /* length of reference */
- rr.refseg = segment; /* segment referred to */
- write_reloc_rec(&rr);
-
- rr.offset = *(int64_t *)data - (rr.offset + bytes);
- membufwrite(seg[segto], &rr.offset, -4);
- }
-}
-
-static void rdf_cleanup(int debuginfo)
-{
- int32_t l;
- uint8_t b[4], *d;
- struct BSSRec bs;
-
- (void)debuginfo;
-
- /* should write imported & exported symbol declarations to header here */
-
- /* generate the output file... */
- fwrite(RDOFFId, 6, 1, ofile); /* file type magic number */
-
- if (bsslength != 0) { /* reserve BSS */
- bs.type = 5;
- bs.amount = bsslength;
- write_bss_rec(&bs);
- }
-
- l = membuflength(header);
- d = b;
- WRITELONG(d, l);
-
- fwrite(b, 4, 1, ofile); /* write length of header */
- membufdump(header, ofile); /* dump header */
-
- l = membuflength(seg[0]);
- d = b; /* code segment */
- WRITELONG(d, l);
-
- fwrite(b, 4, 1, ofile);
- membufdump(seg[0], ofile);
-
- l = membuflength(seg[1]);
- d = b; /* data segment */
- WRITELONG(d, l);
-
- fwrite(b, 4, 1, ofile);
- membufdump(seg[1], ofile);
-
- freemembuf(header);
- freemembuf(seg[0]);
- freemembuf(seg[1]);
-}
-
-static int32_t rdf_segbase(int32_t segment)
-{
- return segment;
-}
-
-static int rdf_directive(char *directive, char *value, int pass)
-{
- struct DLLRec r;
-
- if (!strcmp(directive, "library")) {
- if (pass == 1) {
- r.type = 4;
- strcpy(r.libname, value);
- write_dll_rec(&r);
- }
- return 1;
- }
-
- return 0;
-}
-
-static void rdf_filename(char *inname, char *outname, efunc error)
-{
- standard_extension(inname, outname, ".rdf", error);
-}
-
-extern macros_t rdf_stdmac[];
-
-static int rdf_set_info(enum geninfo type, char **val)
-{
- return 0;
-}
-
-struct ofmt of_rdf = {
- "Relocatable Dynamic Object File Format v1.1",
-#ifdef OF_RDF2
- "oldrdf",
-#else
- "rdf",
-#endif
- 0,
- null_debug_arr,
- &null_debug_form,
- rdf_stdmac,
- rdf_init,
- rdf_set_info,
- rdf_out,
- rdf_deflabel,
- rdf_section_names,
- rdf_segbase,
- rdf_directive,
- rdf_filename,
- rdf_cleanup
-};
-
-#endif /* OF_RDF */
projects / platform / upstream / nasm.git / commitdiff