cfb7176ca2
Move the handling of "extra" macros (i.e. output format macros) into the macros.pl mechanism. This allows us to change the format of the internal macro store in the future - e.g. to a single byte store without redundant pointers. Also, stop using indicies into a long array when there is no good reason to not just use different arrays.
541 lines
15 KiB
C
541 lines
15 KiB
C
/* outrdf.c output routines for the Netwide Assembler to produce
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* RDOFF format object files (which are intended mainly
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* for use in proprietary projects, as the code to load and
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* execute them is very simple). They will also be used
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* for device drivers and possibly some executable files
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* in the MOSCOW operating system. See Rdoff.txt for
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* details.
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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 license given in the file "LICENSE"
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* distributed in the NASM archive.
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*/
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#include "compiler.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <assert.h>
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#include "nasm.h"
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#include "nasmlib.h"
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#include "outform.h"
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/* VERBOSE_WARNINGS: define this to add some extra warnings... */
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#define VERBOSE_WARNINGS
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#ifdef OF_RDF
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typedef int16_t 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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static const char *RDOFFId = "RDOFF1"; /* written to start of RDOFF files */
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/* the records that can be found in the RDOFF header */
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/* Note that whenever a segment is referred to in the RDOFF file, its number
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* is always half of the segment number that NASM uses to refer to it; this
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* is because NASM only allocates even numbered segments, so as to not
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* waste any of the 16 bits of segment number written to the file - this
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* allows up to 65533 external labels to be defined; otherwise it would be
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* 32764. */
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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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int32_t 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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int32_t 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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int32_t amount; /* number of bytes BSS to reserve */
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};
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/* code for managing buffers needed to seperate code and data into individual
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* sections until they are ready to be written to the file.
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* We'd better hope that it all fits in memory else we're buggered... */
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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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static memorybuffer *newmembuf(void)
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{
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memorybuffer *t;
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t = nasm_malloc(sizeof(memorybuffer));
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t->length = 0;
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t->next = NULL;
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return t;
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}
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static void membufwrite(memorybuffer * b, void *data, int bytes)
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{
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int16 w;
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int32_t l;
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if (b->next) { /* memory buffer full - use next buffer */
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membufwrite(b->next, data, bytes);
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return;
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}
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if ((bytes < 0 && b->length - bytes > BUF_BLOCK_LEN)
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|| (bytes > 0 && b->length + bytes > BUF_BLOCK_LEN)) {
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/* buffer full and no next allocated... allocate and initialize next
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* buffer */
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b->next = newmembuf();
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membufwrite(b->next, data, bytes);
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return;
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}
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switch (bytes) {
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case -4: /* convert to little-endian */
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l = *(int32_t *)data;
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b->buffer[b->length++] = l & 0xFF;
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l >>= 8;
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b->buffer[b->length++] = l & 0xFF;
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l >>= 8;
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b->buffer[b->length++] = l & 0xFF;
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l >>= 8;
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b->buffer[b->length++] = l & 0xFF;
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break;
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case -2:
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w = *(int16 *) data;
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b->buffer[b->length++] = w & 0xFF;
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w >>= 8;
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b->buffer[b->length++] = w & 0xFF;
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break;
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default:
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while (bytes--) {
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b->buffer[b->length++] = *(*(uint8_t **)&data);
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(*(uint8_t **)&data)++;
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}
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break;
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}
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}
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static void membufdump(memorybuffer * b, FILE * fp)
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{
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if (!b)
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return;
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fwrite(b->buffer, 1, b->length, fp);
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membufdump(b->next, fp);
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}
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static int membuflength(memorybuffer * b)
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{
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if (!b)
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return 0;
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return b->length + membuflength(b->next);
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}
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static void freemembuf(memorybuffer * b)
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{
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if (!b)
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return;
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freemembuf(b->next);
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nasm_free(b);
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}
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/***********************************************************************
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* Actual code to deal with RDOFF ouput format begins here...
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*/
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/* global variables set during the initialisation phase */
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static memorybuffer *seg[2]; /* seg 0 = code, seg 1 = data */
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static memorybuffer *header; /* relocation/import/export records */
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static FILE *ofile;
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static efunc error;
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static int segtext, segdata, segbss;
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static int32_t bsslength;
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static void rdf_init(FILE * fp, efunc errfunc, ldfunc ldef, evalfunc eval)
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{
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maxbits = 64;
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ofile = fp;
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error = errfunc;
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seg[0] = newmembuf();
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seg[1] = newmembuf();
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header = newmembuf();
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segtext = seg_alloc();
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segdata = seg_alloc();
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segbss = seg_alloc();
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if (segtext != 0 || segdata != 2 || segbss != 4)
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error(ERR_PANIC,
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"rdf segment numbers not allocated as expected (%d,%d,%d)",
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segtext, segdata, segbss);
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bsslength = 0;
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}
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static int32_t rdf_section_names(char *name, int pass, int *bits)
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{
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/*
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* Default is 32 bits.
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*/
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if (!name)
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*bits = 32;
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if (!name)
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return 0;
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if (!strcmp(name, ".text"))
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return 0;
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else if (!strcmp(name, ".data"))
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return 2;
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else if (!strcmp(name, ".bss"))
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return 4;
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else
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return NO_SEG;
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}
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static void write_reloc_rec(struct RelocRec *r)
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{
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if (r->refseg != NO_SEG && (r->refseg & 1))
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error(ERR_NONFATAL, "RDF format does not support segment base"
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" references");
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r->refseg >>= 1; /* adjust segment nos to RDF rather than NASM */
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membufwrite(header, &r->type, 1);
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membufwrite(header, &r->segment, 1);
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membufwrite(header, &r->offset, -4);
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membufwrite(header, &r->length, 1);
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membufwrite(header, &r->refseg, -2); /* 9 bytes written */
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}
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static void write_export_rec(struct ExportRec *r)
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{
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r->segment >>= 1;
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membufwrite(header, &r->type, 1);
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membufwrite(header, &r->segment, 1);
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membufwrite(header, &r->offset, -4);
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membufwrite(header, r->label, strlen(r->label) + 1);
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}
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static void write_import_rec(struct ImportRec *r)
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{
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r->segment >>= 1;
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membufwrite(header, &r->type, 1);
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membufwrite(header, &r->segment, -2);
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membufwrite(header, r->label, strlen(r->label) + 1);
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}
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static void write_bss_rec(struct BSSRec *r)
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{
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membufwrite(header, &r->type, 1);
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membufwrite(header, &r->amount, -4);
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}
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static void write_dll_rec(struct DLLRec *r)
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{
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membufwrite(header, &r->type, 1);
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membufwrite(header, r->libname, strlen(r->libname) + 1);
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}
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static void rdf_deflabel(char *name, int32_t segment, int32_t offset,
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int is_global, char *special)
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{
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struct ExportRec r;
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struct ImportRec ri;
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#ifdef VERBOSE_WARNINGS
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static int warned_common = 0;
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#endif
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if (special)
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error(ERR_NONFATAL, "RDOFF format does not support any"
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" special symbol types");
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if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
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error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
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return;
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}
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if (is_global == 2) {
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#ifdef VERBOSE_WARNINGS
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if (!warned_common) {
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error(ERR_WARNING,
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"common declarations not supported: using extern");
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warned_common = 1;
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}
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#endif
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is_global = 1;
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}
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if (segment > 4) { /* EXTERN declaration */
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ri.type = 2;
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ri.segment = segment;
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strncpy(ri.label, name, 32);
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ri.label[32] = 0;
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write_import_rec(&ri);
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} else if (is_global) {
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r.type = 3;
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r.segment = segment;
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r.offset = offset;
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strncpy(r.label, name, 32);
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r.label[32] = 0;
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write_export_rec(&r);
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}
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}
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static void rdf_out(int32_t segto, void *data, uint32_t type,
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int32_t segment, int32_t wrt)
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{
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int32_t bytes = type & OUT_SIZMASK;
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struct RelocRec rr;
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uint8_t databuf[8], *pd;
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if (segto == NO_SEG) {
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if ((type & OUT_TYPMASK) != OUT_RESERVE)
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error(ERR_NONFATAL,
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"attempt to assemble code in ABSOLUTE space");
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return;
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}
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segto >>= 1; /* convert NASM segment no to RDF number */
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if (segto != 0 && segto != 1 && segto != 2) {
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error(ERR_NONFATAL,
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"specified segment not supported by rdf output format");
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return;
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}
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if (wrt != NO_SEG) {
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wrt = NO_SEG; /* continue to do _something_ */
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error(ERR_NONFATAL, "WRT not supported by rdf output format");
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}
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type &= OUT_TYPMASK;
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if (segto == 2 && type != OUT_RESERVE) {
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error(ERR_NONFATAL, "BSS segments may not be initialized");
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/* just reserve the space for now... */
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if (type == OUT_REL2ADR)
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bytes = 2;
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else
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bytes = 4;
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type = OUT_RESERVE;
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}
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if (type == OUT_RESERVE) {
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if (segto == 2) /* BSS segment space reserverd */
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bsslength += bytes;
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else
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while (bytes--)
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membufwrite(seg[segto], databuf, 1);
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} else if (type == OUT_RAWDATA) {
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if (segment != NO_SEG)
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error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
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membufwrite(seg[segto], data, bytes);
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} else if (type == OUT_ADDRESS) {
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/* if segment == NO_SEG then we are writing an address of an
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object within the same segment - do not produce reloc rec. */
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if (segment != NO_SEG) {
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/* it's an address, so we must write a relocation record */
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rr.type = 1; /* type signature */
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rr.segment = segto; /* segment we're currently in */
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rr.offset = membuflength(seg[segto]); /* current offset */
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rr.length = bytes; /* length of reference */
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rr.refseg = segment; /* segment referred to */
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write_reloc_rec(&rr);
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}
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pd = databuf; /* convert address to little-endian */
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WRITEADDR(pd, *(int64_t *)data, bytes);
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membufwrite(seg[segto], databuf, bytes);
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} else if (type == OUT_REL2ADR) {
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if (segment == segto)
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error(ERR_PANIC, "intra-segment OUT_REL2ADR");
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if (segment != NO_SEG && segment % 2) {
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error(ERR_NONFATAL,
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"rdf format does not support segment base refs");
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}
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rr.type = 1; /* type signature */
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rr.segment = segto + 64; /* segment we're currently in + rel flag */
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rr.offset = membuflength(seg[segto]); /* current offset */
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rr.length = 2; /* length of reference */
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rr.refseg = segment; /* segment referred to */
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write_reloc_rec(&rr);
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/* work out what to put in the code: offset of the end of this operand,
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* subtracted from any data specified, so that loader can just add
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* address of imported symbol onto it to get address relative to end of
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* instruction: import_address + data(offset) - end_of_instrn */
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rr.offset = *(int64_t *)data - (rr.offset + bytes);
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membufwrite(seg[segto], &rr.offset, -2);
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} else if (type == OUT_REL4ADR) {
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if ((segment == segto) && (globalbits != 64))
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error(ERR_PANIC, "intra-segment OUT_REL4ADR");
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if (segment != NO_SEG && segment % 2) {
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error(ERR_NONFATAL,
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"rdf format does not support segment base refs");
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}
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rr.type = 1; /* type signature */
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rr.segment = segto + 64; /* segment we're currently in + rel tag */
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rr.offset = membuflength(seg[segto]); /* current offset */
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rr.length = 4; /* length of reference */
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rr.refseg = segment; /* segment referred to */
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write_reloc_rec(&rr);
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rr.offset = *(int64_t *)data - (rr.offset + bytes);
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membufwrite(seg[segto], &rr.offset, -4);
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}
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}
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|
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static void rdf_cleanup(int debuginfo)
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{
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int32_t l;
|
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uint8_t b[4], *d;
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struct BSSRec bs;
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(void)debuginfo;
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/* should write imported & exported symbol declarations to header here */
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/* generate the output file... */
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fwrite(RDOFFId, 6, 1, ofile); /* file type magic number */
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if (bsslength != 0) { /* reserve BSS */
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bs.type = 5;
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bs.amount = bsslength;
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write_bss_rec(&bs);
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}
|
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|
|
l = membuflength(header);
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|
d = b;
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|
WRITELONG(d, l);
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|
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fwrite(b, 4, 1, ofile); /* write length of header */
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membufdump(header, ofile); /* dump header */
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|
|
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l = membuflength(seg[0]);
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d = b; /* code segment */
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WRITELONG(d, l);
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fwrite(b, 4, 1, ofile);
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membufdump(seg[0], ofile);
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|
|
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l = membuflength(seg[1]);
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d = b; /* data segment */
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WRITELONG(d, l);
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|
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fwrite(b, 4, 1, ofile);
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membufdump(seg[1], ofile);
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|
|
freemembuf(header);
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freemembuf(seg[0]);
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freemembuf(seg[1]);
|
|
fclose(ofile);
|
|
}
|
|
|
|
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;
|
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strcpy(r.libname, value);
|
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write_dll_rec(&r);
|
|
}
|
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return 1;
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}
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|
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return 0;
|
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}
|
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|
|
static void rdf_filename(char *inname, char *outname, efunc error)
|
|
{
|
|
standard_extension(inname, outname, ".rdf", error);
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|
}
|
|
|
|
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
|
|
NULL,
|
|
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
|
|
};
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|
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#endif /* OF_RDF */
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