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-rw-r--r--output/outas86.c647
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diff --git a/output/outas86.c b/output/outas86.c
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--- /dev/null
+++ b/output/outas86.c
@@ -0,0 +1,647 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * 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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * outas86.c output routines for the Netwide Assembler to produce
+ * Linux as86 (bin86-0.3) object files
+ */
+
+#include "compiler.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <inttypes.h>
+
+#include "nasm.h"
+#include "nasmlib.h"
+#include "saa.h"
+#include "raa.h"
+#include "output/outform.h"
+#include "output/outlib.h"
+
+#ifdef OF_AS86
+
+struct Piece {
+ struct Piece *next;
+ int type; /* 0 = absolute, 1 = seg, 2 = sym */
+ int32_t offset; /* relative offset */
+ int number; /* symbol/segment number (4=bss) */
+ int32_t bytes; /* size of reloc or of absolute data */
+ bool relative; /* relative address? */
+};
+
+struct Symbol {
+ int32_t strpos; /* string table position of name */
+ int flags; /* symbol flags */
+ int segment; /* 4=bss at this point */
+ int32_t value; /* address, or COMMON variable size */
+};
+
+/*
+ * Section IDs - used in Piece.number and Symbol.segment.
+ */
+#define SECT_TEXT 0 /* text section */
+#define SECT_DATA 3 /* data section */
+#define SECT_BSS 4 /* bss section */
+
+/*
+ * Flags used in Symbol.flags.
+ */
+#define SYM_ENTRY (1<<8)
+#define SYM_EXPORT (1<<7)
+#define SYM_IMPORT (1<<6)
+#define SYM_ABSOLUTE (1<<4)
+
+struct Section {
+ struct SAA *data;
+ uint32_t datalen, size, len;
+ int32_t index;
+ struct Piece *head, *last, **tail;
+};
+
+static char as86_module[FILENAME_MAX];
+
+static struct Section stext, sdata;
+static uint32_t bsslen;
+static int32_t bssindex;
+
+static struct SAA *syms;
+static uint32_t nsyms;
+
+static struct RAA *bsym;
+
+static struct SAA *strs;
+static uint32_t strslen;
+
+static int as86_reloc_size;
+
+static void as86_write(void);
+static void as86_write_section(struct Section *, int);
+static int as86_add_string(char *name);
+static void as86_sect_write(struct Section *, const uint8_t *,
+ uint32_t);
+
+static void as86_init(void)
+{
+ stext.data = saa_init(1L);
+ stext.datalen = 0L;
+ stext.head = stext.last = NULL;
+ stext.tail = &stext.head;
+ sdata.data = saa_init(1L);
+ sdata.datalen = 0L;
+ sdata.head = sdata.last = NULL;
+ sdata.tail = &sdata.head;
+ bsslen =
+ stext.len = stext.datalen = stext.size =
+ sdata.len = sdata.datalen = sdata.size = 0;
+ stext.index = seg_alloc();
+ sdata.index = seg_alloc();
+ bssindex = seg_alloc();
+ syms = saa_init((int32_t)sizeof(struct Symbol));
+ nsyms = 0;
+ bsym = raa_init();
+ strs = saa_init(1L);
+ strslen = 0;
+
+ as86_add_string(as86_module);
+}
+
+static void as86_cleanup(int debuginfo)
+{
+ struct Piece *p;
+
+ (void)debuginfo;
+
+ as86_write();
+ saa_free(stext.data);
+ while (stext.head) {
+ p = stext.head;
+ stext.head = stext.head->next;
+ nasm_free(p);
+ }
+ saa_free(sdata.data);
+ while (sdata.head) {
+ p = sdata.head;
+ sdata.head = sdata.head->next;
+ nasm_free(p);
+ }
+ saa_free(syms);
+ raa_free(bsym);
+ saa_free(strs);
+}
+
+static int32_t as86_section_names(char *name, int pass, int *bits)
+{
+
+ (void)pass;
+
+ /*
+ * Default is 16 bits.
+ */
+ if (!name)
+ *bits = 16;
+
+ if (!name)
+ return stext.index;
+
+ if (!strcmp(name, ".text"))
+ return stext.index;
+ else if (!strcmp(name, ".data"))
+ return sdata.index;
+ else if (!strcmp(name, ".bss"))
+ return bssindex;
+ else
+ return NO_SEG;
+}
+
+static int as86_add_string(char *name)
+{
+ int pos = strslen;
+ int length = strlen(name);
+
+ saa_wbytes(strs, name, (int32_t)(length + 1));
+ strslen += 1 + length;
+
+ return pos;
+}
+
+static void as86_deflabel(char *name, int32_t segment, int64_t offset,
+ int is_global, char *special)
+{
+ bool is_start = false;
+ struct Symbol *sym;
+
+ if (special)
+ nasm_error(ERR_NONFATAL, "as86 format does not support any"
+ " special symbol types");
+
+
+ if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
+ if (strcmp(name, "..start")) {
+ nasm_error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
+ return;
+ } else {
+ is_start = true;
+ }
+ }
+
+ sym = saa_wstruct(syms);
+
+ sym->strpos = as86_add_string(name);
+ sym->flags = 0;
+
+ if (is_start)
+ sym->flags = SYM_ENTRY;
+
+ if (segment == NO_SEG)
+ sym->flags |= SYM_ABSOLUTE, sym->segment = 0;
+ else if (segment == stext.index)
+ sym->segment = SECT_TEXT;
+ else if (segment == sdata.index)
+ sym->segment = SECT_DATA;
+ else if (segment == bssindex)
+ sym->segment = SECT_BSS;
+ else {
+ sym->flags |= SYM_IMPORT;
+ sym->segment = 15;
+ }
+
+ if (is_global == 2)
+ sym->segment = 3; /* already have IMPORT */
+
+ if (is_global && !(sym->flags & SYM_IMPORT))
+ sym->flags |= SYM_EXPORT;
+
+ sym->value = offset;
+
+ /*
+ * define the references from external-symbol segment numbers
+ * to these symbol records.
+ */
+ if (segment != NO_SEG && segment != stext.index &&
+ segment != sdata.index && segment != bssindex)
+ bsym = raa_write(bsym, segment, nsyms);
+
+ nsyms++;
+}
+
+static void as86_add_piece(struct Section *sect, int type, int32_t offset,
+ int32_t segment, int32_t bytes, int relative)
+{
+ struct Piece *p;
+
+ sect->len += bytes;
+
+ if (type == 0 && sect->last && sect->last->type == 0) {
+ sect->last->bytes += bytes;
+ return;
+ }
+
+ p = sect->last = *sect->tail = nasm_malloc(sizeof(struct Piece));
+ sect->tail = &p->next;
+ p->next = NULL;
+
+ p->type = type;
+ p->offset = offset;
+ p->bytes = bytes;
+ p->relative = relative;
+
+ if (type == 1 && segment == stext.index)
+ p->number = SECT_TEXT;
+ else if (type == 1 && segment == sdata.index)
+ p->number = SECT_DATA;
+ else if (type == 1 && segment == bssindex)
+ p->number = SECT_BSS;
+ else if (type == 1)
+ p->number = raa_read(bsym, segment), p->type = 2;
+}
+
+static void as86_out(int32_t segto, const void *data,
+ enum out_type type, uint64_t size,
+ int32_t segment, int32_t wrt)
+{
+ struct Section *s;
+ int32_t offset;
+ uint8_t mydata[4], *p;
+
+ if (wrt != NO_SEG) {
+ wrt = NO_SEG; /* continue to do _something_ */
+ nasm_error(ERR_NONFATAL, "WRT not supported by as86 output format");
+ }
+
+ /*
+ * handle absolute-assembly (structure definitions)
+ */
+ if (segto == NO_SEG) {
+ if (type != OUT_RESERVE)
+ nasm_error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
+ " space");
+ return;
+ }
+
+ if (segto == stext.index)
+ s = &stext;
+ else if (segto == sdata.index)
+ s = &sdata;
+ else if (segto == bssindex)
+ s = NULL;
+ else {
+ nasm_error(ERR_WARNING, "attempt to assemble code in"
+ " segment %d: defaulting to `.text'", segto);
+ s = &stext;
+ }
+
+ if (!s && type != OUT_RESERVE) {
+ nasm_error(ERR_WARNING, "attempt to initialize memory in the"
+ " BSS section: ignored");
+ bsslen += realsize(type, size);
+ return;
+ }
+
+ if (type == OUT_RESERVE) {
+ if (s) {
+ nasm_error(ERR_WARNING, "uninitialized space declared in"
+ " %s section: zeroing",
+ (segto == stext.index ? "code" : "data"));
+ as86_sect_write(s, NULL, size);
+ as86_add_piece(s, 0, 0L, 0L, size, 0);
+ } else
+ bsslen += size;
+ } else if (type == OUT_RAWDATA) {
+ if (segment != NO_SEG)
+ nasm_error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
+ as86_sect_write(s, data, size);
+ as86_add_piece(s, 0, 0L, 0L, size, 0);
+ } else if (type == OUT_ADDRESS) {
+ if (segment != NO_SEG) {
+ if (segment % 2) {
+ nasm_error(ERR_NONFATAL, "as86 format does not support"
+ " segment base references");
+ } else {
+ offset = *(int64_t *)data;
+ as86_add_piece(s, 1, offset, segment, size, 0);
+ }
+ } else {
+ p = mydata;
+ WRITELONG(p, *(int64_t *)data);
+ as86_sect_write(s, data, size);
+ as86_add_piece(s, 0, 0L, 0L, size, 0);
+ }
+ } else if (type == OUT_REL2ADR) {
+ if (segment == segto)
+ nasm_error(ERR_PANIC, "intra-segment OUT_REL2ADR");
+ if (segment != NO_SEG) {
+ if (segment % 2) {
+ nasm_error(ERR_NONFATAL, "as86 format does not support"
+ " segment base references");
+ } else {
+ offset = *(int64_t *)data;
+ as86_add_piece(s, 1, offset - size + 2, segment, 2L,
+ 1);
+ }
+ }
+ } else if (type == OUT_REL4ADR) {
+ if (segment == segto)
+ nasm_error(ERR_PANIC, "intra-segment OUT_REL4ADR");
+ if (segment != NO_SEG) {
+ if (segment % 2) {
+ nasm_error(ERR_NONFATAL, "as86 format does not support"
+ " segment base references");
+ } else {
+ offset = *(int64_t *)data;
+ as86_add_piece(s, 1, offset - size + 4, segment, 4L,
+ 1);
+ }
+ }
+ }
+}
+
+static void as86_write(void)
+{
+ uint32_t i;
+ int32_t symlen, seglen, segsize;
+
+ /*
+ * First, go through the symbol records working out how big
+ * each will be. Also fix up BSS references at this time, and
+ * set the flags words up completely.
+ */
+ symlen = 0;
+ saa_rewind(syms);
+ for (i = 0; i < nsyms; i++) {
+ struct Symbol *sym = saa_rstruct(syms);
+ if (sym->segment == SECT_BSS)
+ sym->segment = SECT_DATA, sym->value += sdata.len;
+ sym->flags |= sym->segment;
+ if (sym->value == 0)
+ sym->flags |= 0 << 14, symlen += 4;
+ else if (sym->value >= 0 && sym->value <= 255)
+ sym->flags |= 1 << 14, symlen += 5;
+ else if (sym->value >= 0 && sym->value <= 65535L)
+ sym->flags |= 2 << 14, symlen += 6;
+ else
+ sym->flags |= 3 << 14, symlen += 8;
+ }
+
+ /*
+ * Now do the same for the segments, and get the segment size
+ * descriptor word at the same time.
+ */
+ seglen = segsize = 0;
+ if ((uint32_t)stext.len > 65535L)
+ segsize |= 0x03000000L, seglen += 4;
+ else
+ segsize |= 0x02000000L, seglen += 2;
+ if ((uint32_t)sdata.len > 65535L)
+ segsize |= 0xC0000000L, seglen += 4;
+ else
+ segsize |= 0x80000000L, seglen += 2;
+
+ /*
+ * Emit the as86 header.
+ */
+ fwriteint32_t(0x000186A3L, ofile);
+ fputc(0x2A, ofile);
+ fwriteint32_t(27 + symlen + seglen + strslen, ofile); /* header length */
+ fwriteint32_t(stext.len + sdata.len + bsslen, ofile);
+ fwriteint16_t(strslen, ofile);
+ fwriteint16_t(0, ofile); /* class = revision = 0 */
+ fwriteint32_t(0x55555555L, ofile); /* segment max sizes: always this */
+ fwriteint32_t(segsize, ofile); /* segment size descriptors */
+ if (segsize & 0x01000000L)
+ fwriteint32_t(stext.len, ofile);
+ else
+ fwriteint16_t(stext.len, ofile);
+ if (segsize & 0x40000000L)
+ fwriteint32_t(sdata.len + bsslen, ofile);
+ else
+ fwriteint16_t(sdata.len + bsslen, ofile);
+ fwriteint16_t(nsyms, ofile);
+
+ /*
+ * Write the symbol table.
+ */
+ saa_rewind(syms);
+ for (i = 0; i < nsyms; i++) {
+ struct Symbol *sym = saa_rstruct(syms);
+ fwriteint16_t(sym->strpos, ofile);
+ fwriteint16_t(sym->flags, ofile);
+ switch (sym->flags & (3 << 14)) {
+ case 0 << 14:
+ break;
+ case 1 << 14:
+ fputc(sym->value, ofile);
+ break;
+ case 2 << 14:
+ fwriteint16_t(sym->value, ofile);
+ break;
+ case 3 << 14:
+ fwriteint32_t(sym->value, ofile);
+ break;
+ }
+ }
+
+ /*
+ * Write out the string table.
+ */
+ saa_fpwrite(strs, ofile);
+
+ /*
+ * Write the program text.
+ */
+ as86_reloc_size = -1;
+ as86_write_section(&stext, SECT_TEXT);
+ as86_write_section(&sdata, SECT_DATA);
+ /*
+ * Append the BSS section to the .data section
+ */
+ if (bsslen > 65535L) {
+ fputc(0x13, ofile);
+ fwriteint32_t(bsslen, ofile);
+ } else if (bsslen > 255) {
+ fputc(0x12, ofile);
+ fwriteint16_t(bsslen, ofile);
+ } else if (bsslen) {
+ fputc(0x11, ofile);
+ fputc(bsslen, ofile);
+ }
+
+ fputc(0, ofile); /* termination */
+}
+
+static void as86_set_rsize(int size)
+{
+ if (as86_reloc_size != size) {
+ switch (as86_reloc_size = size) {
+ case 1:
+ fputc(0x01, ofile);
+ break;
+ case 2:
+ fputc(0x02, ofile);
+ break;
+ case 4:
+ fputc(0x03, ofile);
+ break;
+ default:
+ nasm_error(ERR_PANIC, "bizarre relocation size %d", size);
+ break;
+ }
+ }
+}
+
+static void as86_write_section(struct Section *sect, int index)
+{
+ struct Piece *p;
+ uint32_t s;
+ int32_t length;
+
+ fputc(0x20 + index, ofile); /* select the right section */
+
+ saa_rewind(sect->data);
+
+ for (p = sect->head; p; p = p->next)
+ switch (p->type) {
+ case 0:
+ /*
+ * Absolute data. Emit it in chunks of at most 64
+ * bytes.
+ */
+ length = p->bytes;
+ do {
+ char buf[64];
+ int32_t tmplen = (length > 64 ? 64 : length);
+ fputc(0x40 | (tmplen & 0x3F), ofile);
+ saa_rnbytes(sect->data, buf, tmplen);
+ fwrite(buf, 1, tmplen, ofile);
+ length -= tmplen;
+ } while (length > 0);
+ break;
+ case 1:
+ /*
+ * A segment-type relocation. First fix up the BSS.
+ */
+ if (p->number == SECT_BSS)
+ p->number = SECT_DATA, p->offset += sdata.len;
+ as86_set_rsize(p->bytes);
+ fputc(0x80 | (p->relative ? 0x20 : 0) | p->number, ofile);
+ if (as86_reloc_size == 2)
+ fwriteint16_t(p->offset, ofile);
+ else
+ fwriteint32_t(p->offset, ofile);
+ break;
+ case 2:
+ /*
+ * A symbol-type relocation.
+ */
+ as86_set_rsize(p->bytes);
+ s = p->offset;
+ if (s > 65535L)
+ s = 3;
+ else if (s > 255)
+ s = 2;
+ else if (s > 0)
+ s = 1;
+ else
+ s = 0;
+ fputc(0xC0 |
+ (p->relative ? 0x20 : 0) |
+ (p->number > 255 ? 0x04 : 0) | s, ofile);
+ if (p->number > 255)
+ fwriteint16_t(p->number, ofile);
+ else
+ fputc(p->number, ofile);
+ switch ((int)s) {
+ case 0:
+ break;
+ case 1:
+ fputc(p->offset, ofile);
+ break;
+ case 2:
+ fwriteint16_t(p->offset, ofile);
+ break;
+ case 3:
+ fwriteint32_t(p->offset, ofile);
+ break;
+ }
+ break;
+ }
+}
+
+static void as86_sect_write(struct Section *sect,
+ const uint8_t *data, uint32_t len)
+{
+ saa_wbytes(sect->data, data, len);
+ sect->datalen += len;
+}
+
+static int32_t as86_segbase(int32_t segment)
+{
+ return segment;
+}
+
+static void as86_filename(char *inname, char *outname)
+{
+ char *p;
+
+ if ((p = strrchr(inname, '.')) != NULL) {
+ strncpy(as86_module, inname, p - inname);
+ as86_module[p - inname] = '\0';
+ } else
+ strcpy(as86_module, inname);
+
+ standard_extension(inname, outname, ".o");
+}
+
+extern macros_t as86_stdmac[];
+
+struct ofmt of_as86 = {
+ "Linux as86 (bin86 version 0.3) object files",
+ "as86",
+ 0,
+ null_debug_arr,
+ &null_debug_form,
+ as86_stdmac,
+ as86_init,
+ null_setinfo,
+ as86_out,
+ as86_deflabel,
+ as86_section_names,
+ as86_segbase,
+ null_directive,
+ as86_filename,
+ as86_cleanup
+};
+
+#endif /* OF_AS86 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 16:54:01 +0000