outbin.c
资源名称:nasm-0.98.zip [点击查看]
上传用户:yuppie_zhu
上传日期:2007-01-08
资源大小:535k
文件大小:10k
源码类别:
编译器/解释器
开发平台:
C/C++
- /* outbin.c output routines for the Netwide Assembler to produce
- * flat-form binary files
- *
- * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
- * Julian Hall. All rights reserved. The software is
- * redistributable under the licence given in the file "Licence"
- * distributed in the NASM archive.
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <ctype.h>
- #include "nasm.h"
- #include "nasmlib.h"
- #include "outform.h"
- #ifdef OF_BIN
- static FILE *fp;
- static efunc error;
- static struct Section {
- struct SAA *contents;
- long length;
- long index;
- } textsect, datasect;
- static long bsslen, bssindex;
- static struct Reloc {
- struct Reloc *next;
- long posn;
- long bytes;
- long secref;
- long secrel;
- struct Section *target;
- } *relocs, **reloctail;
- static long data_align, bss_align;
- static long start_point;
- static void add_reloc (struct Section *s, long bytes, long secref,
- long secrel)
- {
- struct Reloc *r;
- r = *reloctail = nasm_malloc(sizeof(struct Reloc));
- reloctail = &r->next;
- r->next = NULL;
- r->posn = s->length;
- r->bytes = bytes;
- r->secref = secref;
- r->secrel = secrel;
- r->target = s;
- }
- static void bin_init (FILE *afp, efunc errfunc, ldfunc ldef, evalfunc eval)
- {
- fp = afp;
- (void) eval; /* Don't warn that this parameter is unused */
- error = errfunc;
- (void) ldef; /* placate optimisers */
- start_point = 0L; /* default */
- textsect.contents = saa_init(1L);
- datasect.contents = saa_init(1L);
- textsect.length = datasect.length = 0;
- textsect.index = seg_alloc();
- datasect.index = seg_alloc();
- bsslen = 0;
- bssindex = seg_alloc();
- relocs = NULL;
- reloctail = &relocs;
- data_align = bss_align = 4;
- }
- static void bin_cleanup (int debuginfo)
- {
- struct Reloc *r;
- long datapos, datagap, bsspos;
- (void) debuginfo;
- datapos = start_point + textsect.length;
- datapos = (datapos + data_align-1) & ~(data_align-1);
- datagap = datapos - (start_point + textsect.length);
- bsspos = datapos + datasect.length;
- bsspos = (bsspos + bss_align-1) & ~(bss_align-1);
- saa_rewind (textsect.contents);
- saa_rewind (datasect.contents);
- for (r = relocs; r; r = r->next)
- {
- unsigned char *p, *q, mydata[4];
- long l;
- saa_fread (r->target->contents, r->posn, mydata, r->bytes);
- p = q = mydata;
- l = *p++;
- if (r->bytes > 1) {
- l += ((long)*p++) << 8;
- if (r->bytes == 4) {
- l += ((long)*p++) << 16;
- l += ((long)*p++) << 24;
- }
- }
- if (r->secref == textsect.index)
- l += start_point;
- else if (r->secref == datasect.index)
- l += datapos;
- else if (r->secref == bssindex)
- l += bsspos;
- if (r->secrel == textsect.index)
- l -= start_point;
- else if (r->secrel == datasect.index)
- l -= datapos;
- else if (r->secrel == bssindex)
- l -= bsspos;
- if (r->bytes == 4)
- WRITELONG(q, l);
- else if (r->bytes == 2)
- WRITESHORT(q, l);
- else
- *q++ = l & 0xFF;
- saa_fwrite (r->target->contents, r->posn, mydata, r->bytes);
- }
- saa_fpwrite (textsect.contents, fp);
- if (datasect.length > 0) {
- while (datagap--)
- fputc(' ', fp);
- saa_fpwrite (datasect.contents, fp);
- }
- fclose (fp);
- saa_free (textsect.contents);
- saa_free (datasect.contents);
- while (relocs) {
- r = relocs->next;
- nasm_free (relocs);
- relocs = r;
- }
- }
- static void bin_out (long segto, void *data, unsigned long type,
- long segment, long wrt)
- {
- unsigned char *p, mydata[4];
- struct Section *s;
- long realbytes;
- if (wrt != NO_SEG) {
- wrt = NO_SEG; /* continue to do _something_ */
- error (ERR_NONFATAL, "WRT not supported by binary output format");
- }
- /*
- * handle absolute-assembly (structure definitions)
- */
- if (segto == NO_SEG) {
- if ((type & OUT_TYPMASK) != OUT_RESERVE)
- error (ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
- " space");
- return;
- }
- if (segto == bssindex) { /* BSS */
- if ((type & OUT_TYPMASK) != OUT_RESERVE)
- error(ERR_WARNING, "attempt to initialise memory in the"
- " BSS section: ignored");
- s = NULL;
- } else if (segto == textsect.index) {
- s = &textsect;
- } else if (segto == datasect.index) {
- s = &datasect;
- } else {
- error(ERR_WARNING, "attempt to assemble code in"
- " segment %d: defaulting to `.text'", segto);
- s = &textsect;
- }
- if ((type & OUT_TYPMASK) == OUT_ADDRESS) {
- if (segment != NO_SEG &&
- segment != textsect.index &&
- segment != datasect.index &&
- segment != bssindex) {
- if (segment % 2)
- error(ERR_NONFATAL, "binary output format does not support"
- " segment base references");
- else
- error(ERR_NONFATAL, "binary output format does not support"
- " external references");
- segment = NO_SEG;
- }
- if (s) {
- if (segment != NO_SEG)
- add_reloc (s, type & OUT_SIZMASK, segment, -1L);
- p = mydata;
- if ((type & OUT_SIZMASK) == 4)
- WRITELONG (p, *(long *)data);
- else
- WRITESHORT (p, *(long *)data);
- saa_wbytes (s->contents, mydata, type & OUT_SIZMASK);
- s->length += type & OUT_SIZMASK;
- } else
- bsslen += type & OUT_SIZMASK;
- } else if ((type & OUT_TYPMASK) == OUT_RAWDATA) {
- type &= OUT_SIZMASK;
- p = data;
- if (s) {
- saa_wbytes (s->contents, data, type);
- s->length += type;
- } else
- bsslen += type;
- } else if ((type & OUT_TYPMASK) == OUT_RESERVE) {
- if (s) {
- error(ERR_WARNING, "uninitialised space declared in"
- " %s section: zeroing",
- (segto == textsect.index ? "code" : "data"));
- }
- type &= OUT_SIZMASK;
- if (s) {
- saa_wbytes (s->contents, NULL, type);
- s->length += type;
- } else
- bsslen += type;
- }
- else if ((type & OUT_TYPMASK) == OUT_REL2ADR ||
- (type & OUT_TYPMASK) == OUT_REL4ADR)
- {
- realbytes = ((type & OUT_TYPMASK) == OUT_REL4ADR ? 4 : 2);
- if (segment != NO_SEG &&
- segment != textsect.index &&
- segment != datasect.index &&
- segment != bssindex) {
- if (segment % 2)
- error(ERR_NONFATAL, "binary output format does not support"
- " segment base references");
- else
- error(ERR_NONFATAL, "binary output format does not support"
- " external references");
- segment = NO_SEG;
- }
- if (s) {
- add_reloc (s, realbytes, segment, segto);
- p = mydata;
- if (realbytes == 4)
- WRITELONG (p, *(long*)data - realbytes - s->length);
- else
- WRITESHORT (p, *(long*)data - realbytes - s->length);
- saa_wbytes (s->contents, mydata, realbytes);
- s->length += realbytes;
- } else
- bsslen += realbytes;
- }
- }
- static void bin_deflabel (char *name, long segment, long offset,
- int is_global, char *special)
- {
- (void) segment; /* Don't warn that this parameter is unused */
- (void) offset; /* Don't warn that this parameter is unused */
- if (special)
- error (ERR_NONFATAL, "binary 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) {
- error (ERR_NONFATAL, "binary output format does not support common"
- " variables");
- }
- }
- static long bin_secname (char *name, int pass, int *bits)
- {
- int sec_index;
- long *sec_align;
- char *p;
- (void) pass; /* Don't warn that this parameter is unused */
- /*
- * Default is 16 bits.
- */
- if (!name)
- *bits = 16;
- if (!name)
- return textsect.index;
- p = name;
- while (*p && !isspace(*p)) p++;
- if (*p) *p++ = ' ';
- if (!strcmp(name, ".text")) {
- sec_index = textsect.index;
- sec_align = NULL;
- } else if (!strcmp(name, ".data")) {
- sec_index = datasect.index;
- sec_align = &data_align;
- } else if (!strcmp(name, ".bss")) {
- sec_index = bssindex;
- sec_align = &bss_align;
- } else
- return NO_SEG;
- if (*p) {
- if (!nasm_strnicmp(p,"align=",6)) {
- if (sec_align == NULL)
- error(ERR_NONFATAL, "cannot specify an alignment to"
- " the `.text' section");
- else if (p[6+strspn(p+6,"0123456789")])
- error(ERR_NONFATAL, "argument to `align' is not numeric");
- else {
- unsigned int align = atoi(p+6);
- if (!align || ((align-1) & align))
- error(ERR_NONFATAL, "argument to `align' is not a"
- " power of two");
- else
- *sec_align = align;
- }
- }
- }
- return sec_index;
- }
- static long bin_segbase (long segment)
- {
- return segment;
- }
- static int bin_directive (char *directive, char *value, int pass)
- {
- int rn_error;
- (void) pass; /* Don't warn that this parameter is unused */
- if (!strcmp(directive, "org")) {
- start_point = readnum (value, &rn_error);
- if (rn_error)
- error (ERR_NONFATAL, "argument to ORG should be numeric");
- return 1;
- } else
- return 0;
- }
- static void bin_filename (char *inname, char *outname, efunc error)
- {
- standard_extension (inname, outname, "", error);
- }
- static char *bin_stdmac[] = {
- "%define __SECT__ [section .text]",
- "%imacro org 1+.nolist",
- "[org %1]",
- "%endmacro",
- "%macro __NASM_CDecl__ 1",
- "%endmacro",
- NULL
- };
- static int bin_set_info(enum geninfo type, char **val)
- {
- return 0;
- }
- struct ofmt of_bin = {
- "flat-form binary files (e.g. DOS .COM, .SYS)",
- "bin",
- NULL,
- null_debug_arr,
- &null_debug_form,
- bin_stdmac,
- bin_init,
- bin_set_info,
- bin_out,
- bin_deflabel,
- bin_secname,
- bin_segbase,
- bin_directive,
- bin_filename,
- bin_cleanup
- };
- #endif /* OF_BIN */