shithub: scc

diff: cannot open b/src/cmd/ld//null: file does not exist: 'b/src/cmd/ld//null'

--- a/include/scc/scc/mach.h

+++ b/include/scc/scc/mach.h

@@ -3,7 +3,7 @@

 typedef struct objsect Objsect;

 typedef struct objsym Objsym;

 typedef struct objsymdef Objsymdef;

-typedef struct object Obj;

+typedef struct obj Obj;

 enum sectype {

 	SREAD   = 1 << 0,

@@ -41,12 +41,13 @@

 	Objsymdef *hash, *next;

};

-struct object {

+struct obj {

 	int type;

 	char *index;

 	Objsym *htab[NR_SYMHASH];

 	Objsym *syms;;

 	Objsect *secs;

+	FILE *fp;

 	fpos_t pos;

 	int nsecs;

 	int nsyms;

--- a/src/cmd/Makefile

+++ b/src/cmd/Makefile

@@ -13,7 +13,7 @@

          $(BINDIR)/objcopy \

          $(BINDIR)/addr2line \

-DIRS   = as scc

+DIRS   = ld as scc

 LIBMACH = $(LIBDIR)/libmach.a

 LIBSCC  = $(LIBDIR)/libscc.a

@@ -21,7 +21,7 @@

 all: $(TARGET) $(DIRS)

 $(DIRS): FORCE

-	@+cd $@ && $(MAKE)

+	+@cd $@ && $(MAKE)

 $(BINDIR)/nm: nm.o $(LIBMACH) $(LIBSCC)

 	$(CC) $(SCC_LDFLAGS) nm.o -lmach -lscc -o $@

@@ -34,9 +34,6 @@

 $(BINDIR)/ranlib: ranlib.o $(DRIVER).o $(LIBMACH) $(LIBSCC)

 	$(CC) $(SCC_LDFLAGS) ranlib.o $(DRIVER).o -lmach -lscc -o $@

-$(BINDIR)/ld: ld.o $(LIBMACH) $(LIBSCC)

-	$(CC) $(SCC_LDFLAGS) ld.o -lmach -lscc -o $@

 $(BINDIR)/objdump: objdump.o $(LIBMACH)

 	$(CC) $(SCC_LDFLAGS) objdump.o -lmach -o $@

--- a/src/cmd/ld.c

+++ /dev/null

@@ -1,708 +1,0 @@

-static char sccsid[] = "@(#) ./ld/main.c";

-#include <ctype.h>

-#include <errno.h>

-#include <limits.h>

-#include <stdarg.h>

-#include <stdio.h>

-#include <stdlib.h>

-#include <string.h>

-#include <scc/mach.h>

-#include <scc/scc.h>

-#include <scc/ar.h>

-#include <scc/syslibs.h>

-#define NR_SYMBOL 128

-typedef struct objlst Objlst;

-typedef struct symbol Symbol;

-typedef struct section Section;

-enum {

-	NOINSTALL,

-	INSTALL,

-};

-enum {

-	OUTLIB,

-	INLIB,

-};

-struct section {

-	char *name;

-	unsigned long long size, offset;

-	unsigned flags;

-	int type;

-	FILE *fp;

-	Section *next;

-};

-struct objlst {

-	Obj *obj;

-	struct objlst *next;

-};

-struct symbol {

-	char *name;

-	Obj *obj;

-	Objsym *def;

-	unsigned long long size, value;

-	struct symbol *next, *prev;

-	struct symbol *hash;

-};

-char *output = "a.out", *entry = "start", *datasiz;

-static Section *sections;

-static int bintype = -1;

-static char *filename, *membname;

-static Objlst *objhead, *objlast;

-static Symbol *symtab[NR_SYMBOL];

-static Symbol refhead = {

-	.next = &refhead,

-	.prev = &refhead,

-};

-static int sflag;		/* discard all the symbols */

-static int xflag;		/* discard local symbols */

-static int Xflag;		/* discard locals starting with 'L' */

-static int rflag;		/* preserve relocation bits */

-static int dflag;		/* define common even with rflag */

-static int gflag;               /* preserve debug symbols */

-static int status;

-static char *

-errstr(void)

-{

-	return strerror(errno);

-}

-static void

-error(char *fmt, ...)

-{

-	va_list va;

-	va_start(va, fmt);

-	fprintf(stderr, "ld: %s: ", filename);

-	if (membname)

-		fprintf(stderr, "%s: ", membname);

-	vfprintf(stderr, fmt, va);

-	putc('\n', stderr);

-	va_end(va);

-	status = EXIT_FAILURE;

-}

-static void

-cleanup(void)

-{

-	if (status != EXIT_FAILURE)

-		remove(output);

-}

-static int

-moreundef(void)

-{

-	return refhead.next != &refhead;

-}

-static Symbol *

-lookup(char *name, int install)

-{

-	size_t len;

-	char *s;

-	unsigned h;

-	Symbol *sym;

-	h = genhash(name) % NR_SYMBOL;

-	for (sym = symtab[h]; sym; sym = sym->hash) {

-		if (!strcmp(name, sym->name))

-			return sym;

-	}

-	if (!install)

-		return NULL;

-	len = strlen(name) + 1;

-	sym = malloc(sizeof(*sym));

-	s = malloc(len);

-	if (!len || !s) {

-		error("out of memory");

-		exit(EXIT_FAILURE);

-	}

-	sym->obj = NULL;

-	sym->name = memcpy(s, name, len);

-	sym->hash = symtab[h];

-	symtab[h] = sym;

-	sym->value = 0;

-	sym->size = 0;

-	refhead.next->prev = sym;

-	sym->next = refhead.next;

-	refhead.next = sym;

-	sym->prev = &refhead;

-	return sym;

-}

-static Symbol *

-define(Objsym *osym, Obj *obj)

-{

-	Symbol *sym = lookup(osym->name, INSTALL);

-	if (sym->def && sym->def->type != 'C') {

-		error("%s: symbol redefined", osym->name);

-		return NULL;

-	}

-	sym->obj = obj;

-	sym->def = osym;

-	sym->size = osym->size;

-	sym->value = osym->value;

-	sym->next->prev = sym->prev;

-	sym->prev->next = sym->next;

-	sym->next = sym->prev = NULL;

-	return sym;

-}

-static int

-newsym(Objsym *osym, Obj *obj)

-{

-	Symbol *sym;

-	switch (osym->type) {

-	case 'U':

-		lookup(osym->name, INSTALL);

-	case '?':

-	case 'N':

-		break;

-	case 'C':

-		sym = lookup(osym->name, NOINSTALL);

-		if (!sym || !sym->def) {

-			define(osym, obj);

-			break;

-		}

-		if (sym->def->type != 'C')

-			break;

-		if (sym->size < osym->size)

-			sym->size = osym->size;

-		break;

-	default:

-		if (isupper(osym->type))

-			define(osym, obj);

-		break;

-	}

-	return 1;

-}

-static void

-copy(FILE *to, FILE *from, long pad, long nbytes)

-{

-	int c;

-	while (pad--)

-		putc(0, to);

-	while (nbytes-- && (c = getc(from)) != EOF)

-		putc(c, to);

-	if (c == EOF) {

-		error("section truncated");

-		exit(EXIT_FAILURE);

-	}

-	if (ferror(to) || ferror(from)) {

-		error(errstr());

-		exit(EXIT_FAILURE);

-	}

-}

-static Section *

-findsect(Objsect *secp)

-{

-	size_t len;

-	char *s;

-	FILE *fp;

-	Section *sp, *lastp;

-	for (lastp = sp = sections; sp; lastp = sp, sp = sp->next) {

-		if (!strcmp(sp->name, secp->name))

-			return sp;

-	}

-	len = strlen(secp->name) + 1;

-	s = malloc(len);

-	fp = tmpfile();

-	sp = malloc(sizeof(*sp));

-	if (!s || !sp || !fp) {

-		error(errstr());

-		exit(EXIT_FAILURE);

-	}

-	if (lastp) {

-		lastp->next = sp;

-	} else {

-		sections = sp;

-		sp->next = NULL;

-	}

-	sp->name = memcpy(s, secp->name, len);

-	sp->offset = sp->size = 0;

-	sp->fp = fp;

-	sp->flags = secp->flags;

-	sp->type = secp->type;

-	return sp;

-}

-extern int objpos(Obj *obj, FILE *fp, long pos);

-static void

-newsect(Objsect *secp, Obj *obj, FILE *fp)

-{

-	unsigned long long align, size, pad, off;

-	Section *sp;

-	sp = findsect(secp);

-	align = secp->align - 1;

-	pad = (sp->size+align) & ~align;

-	if (sp->size > ULLONG_MAX - pad)

-		goto overflow;

-	off = sp->size += pad;

-	if (sp->size > ULLONG_MAX - secp->size)

-		goto overflow;

-	sp->size += secp->size;

-	objpos(obj, fp, secp->offset);

-	copy(sp->fp, fp, pad, secp->size);

-	/*

-	 * and now update the offset to relect the offset

-	 * in the output file

-	 */

-	secp->offset = off;

-	return;

-overflow:

-	error("section overflow");

-	exit(EXIT_FAILURE);

-}

-static void

-loadobj(Obj *obj, FILE *fp)

-{

-	int n;

-	Objlst *lst;

-	Objsym *sym;

-	Objsect *secp;

-	if ((lst = malloc(sizeof(*lst))) == NULL) {

-		error("out of memory");

-		return;

-	}

-	lst->obj = obj;

-	lst->next = NULL;

-	if (!objlast)

-		objlast = objhead = lst;

-	else

-		objlast = objlast->next = lst;

-	for (sym = obj->syms; sym; sym = sym->next)

-		newsym(sym, obj);

-	for (secp = obj->secs; secp; secp = secp->next)

-		newsect(secp, obj, fp);

-}

-static void

-newobject(FILE *fp, int type, int inlib)

-{

-	Obj *obj;

-	Symbol *sym, *p;

-	if ((obj = objnew(type)) == NULL) {

-		error("out of memory");

-		return;

-	}

-	if (bintype == -1) {

-		bintype = type;

-	} else if (bintype != type) {

-		error("not compatible object file");

-		goto delete;

-	}

-	bintype = type;

-	if (objread(obj, fp) < 0) {

-		error("object file corrupted");

-		goto delete;

-	}

-	if (objsyms(obj) < 0 || objsect(obj) < 0) {

-		error("object file corrupted");

-		goto delete;

-	}

-	if (!inlib) {

-		loadobj(obj, fp);

-		return;

-	}

-	/*

-	 * we are in a library without index, so we have to check

-	 * if it defines some symbol that is undefined and only

-	 * in that case we have to load the object

-	 */

-	p = &refhead;

-	for (sym = p->next; sym != p; sym = sym->next) {

-		if (objlookup(obj, sym->name, 0)) {

-			loadobj(obj, fp);

-			return;

-		}

-	}

-delete:

-	objdel(obj);

-	return;

-}

-static void

-loadlib(FILE *fp)

-{

-	int t, loaded;

-	long n;

-	Objsymdef *def, *dp;

-	Symbol *sym;

-	if (getindex(bintype, &n, &def, fp) < 0) {

-		error("corrupted index");

-		return;

-	}

-	loaded = 1;

-	while (moreundef() && loaded) {

-		loaded = 0;

-		for (dp = def; dp; dp = dp->next) {

-			sym = lookup(dp->name, NOINSTALL);

-			if (!sym || sym->def)

-				continue;

-			if (fseek(fp, dp->offset, SEEK_SET) == EOF) {

-				error(errstr());

-				goto clean;

-			}

-			if ((t = objtype(fp, NULL)) == -1) {

-				error("library file corrupted");

-				goto clean;

-			}

-			if (t != bintype) {

-				error("incompatible library");

-				goto clean;

-			}

-			newobject(fp, t, OUTLIB);

-			loaded = 1;

-		}

-	}

-clean:

-	free(def);

-}

-static int

-newmember(FILE *fp, char *name, void *data)

-{

-	int t;

-	int *nmemb = data;

-	if (bintype == -1) {

-		error("an object file is needed before any library");

-		return 0;

-	}

-	if (*nmemb++ == 0) {

-		if (!strncmp(name, "/", SARNAM) ||

-		    !strncmp(name, "__.SYMDEF", SARNAM)) {

-			loadlib(fp);

-			return 0;

-		}

-	}

-	membname = name;

-	if ((t = objtype(fp, NULL)) == -1)

-		return 1;

-	if (bintype != t) {

-		error("wrong object file format");

-		return 1;

-	}

-	newobject(fp, t, INLIB);

-	membname = NULL;

-	return 1;

-}

-static int

-newlibrary(FILE *fp)

-{

-	int nmemb = 0;

-	return formember(fp, newmember, &nmemb);

-}

-static FILE *

-openfile(char *name, char *buffer)

-{

-	size_t pathlen, len;

-	FILE *fp;

-	char **bp, **base, **end;

-	char libname[FILENAME_MAX];

-	filename = name;

-	membname = NULL;

-	if (name[0] != '-' || name[1] != 'l') {

-		if ((fp = fopen(name, "rb")) == NULL)

-			error(errstr());

-		return fp;

-	}

-	len = strlen(name+2) + 3;

-	if (len > FILENAME_MAX-1) {

-		error("library name too long");

-		return NULL;

-	}

-	strcat(strcpy(buffer, "lib"), name+2);

-	filename = buffer;

-	if ((fp = fopen(libname, "rb")) != NULL)

-		return fp;

-	base = syslibs;

-	end = &syslibs[MAX_LIB_PATHS];

-	for (bp = base; bp < end && *bp; ++bp) {

-		pathlen = strlen(*bp);

-		if (pathlen + len > FILENAME_MAX-1)

-			continue;

-		memcpy(libname, *bp, pathlen);

-		memcpy(libname+pathlen+1, buffer, len);

-		buffer[pathlen] = '/';

-		if ((fp = fopen(buffer, "rb")) != NULL)

-			return fp;

-	}

-	error("not found");

-	return NULL;

-}

-static void

-listundef(void)

-{

-	Symbol *sym, *p;

-	p = &refhead;

-	for (sym = p->next; sym != p; sym = sym->next) {

-		fprintf(stderr,

-		        "ld: symbol '%s' not defined\n",

-		        sym->name);

-	}

-}

-static void

-pass1(int argc, char *argv[])

-{

-	int t;

-	FILE *fp;

-	char buff[FILENAME_MAX];

-	for ( ; *argv; ++argv) {

-		if ((fp = openfile(*argv, buff)) == NULL)

-			continue;

-		if ((t = objtype(fp, NULL)) != -1)

-			newobject(fp, t, OUTLIB);

-		else if (archive(fp))

-			newlibrary(fp);

-		else

-			error("bad format");

-		fclose(fp);

-	}

-	if (moreundef()) {

-		listundef();

-		exit(EXIT_FAILURE);

-	}

-}

-/*

- * default memory layout:

- * -text

- * -data

- * -bss

- */

-static void

-pass2(int argc, char *argv[])

-{

-	FILE *fp;

-	Section *sp;

-	long off;

-	unsigned long long addr;

-	if ((fp = fopen("binary", "wb")) == NULL) {

-		perror("opening output");

-		exit(EXIT_FAILURE);

-	}

-	addr = 0x100;

-	for (sp = sections; sp; sp = sp->next) {

-		fprintf(stderr, "1st - %c\n", sp->type);

-		if (sp->type != 'T')

-			continue;

-		rewind(sp->fp);

-		copy(fp, sp->fp, 0, sp->size);

-		addr += sp->size;

-		fclose(sp->fp);

-	}

-	addr = addr+3 & ~3;

-	for (sp = sections; sp; sp = sp->next) {

-		fprintf(stderr, "2nd - %c\n", sp->type);

-		if (sp->type != 'D')

-			continue;

-		rewind(sp->fp);

-		copy(fp, sp->fp, 0, sp->size);

-		addr += sp->size;

-		fclose(sp->fp);

-	}

-	addr = addr+3 & ~3;

-	for (sp = sections; sp; sp = sp->next) {

-		fprintf(stderr, "3rd - %c\n", sp->type);

-		if (sp->type != 'B')

-			continue;

-		addr += sp->size;

-		fclose(sp->fp);

-	}

-}

-static void

-usage(void)

-{

-	fputs("usage: ld [options] file ...\n", stderr);

-	exit(EXIT_FAILURE);

-}

-static void

-Lpath(char *path)

-{

-	char **bp, **base, **end;

-	base = syslibs;

-	end = &syslibs[MAX_LIB_PATHS];

-	for (bp = base; bp < end && *bp; ++bp)

-		;

-	if (bp == end) {

-		fputs("ld: too many -L options\n", stderr);

-		exit(1);

-	}

-	*bp = path;

-}

-int

-main(int argc, char *argv[])

-{

-	char *cp, **p;

-	for (--argc; *++argv; --argc) {

-		if (argv[0][0] != '-' || argv[0][1] == 'l')

-			break;

-		if (argv[0][1] == '-') {

-			--argc, ++argv;

-			break;

-		}

-		for (cp = &argv[0][1]; *cp; ++cp) {

-			switch (*cp) {

-			case 's':

-				sflag = 1;

-				break;

-			case 'x':

-				xflag = 1;

-				break;

-			case 'X':

-				Xflag = 1;

-				break;

-			case 'r':

-				rflag = 1;

-				break;

-			case 'd':

-				dflag = 1;

-				break;

-			case 'i':

-			case 'n':

-				/* TODO */

-				break;

-			case 'L':

-				if (argc == 0)

-					goto usage;

-				++argv, --argc;

-				Lpath(*argv);

-				break;

-			case 'u':

-				if (argc == 0)

-					goto usage;

-				++argv, --argc;

-				lookup(*argv, INSTALL);

-				break;

-			case 'o':

-				if (argc == 0)

-					goto usage;

-				++argv, --argc;

-				output = *argv;

-				break;

-			case 'e':

-				if (argc == 0)

-					goto usage;

-				++argv, --argc;

-				entry = *argv;

-				break;

-			case 'D':

-				if (argc == 0)

-					goto usage;

-				++argv, --argc;

-				datasiz = *argv;

-				break;

-			default:

-			usage:

-				usage();

-			}

-		}

-	}

-	if (argc == 0)

-		usage();

-	atexit(cleanup);

-	pass1(argc, argv);

-	pass2(argc, argv);

-	return status;

-}

--- /dev/null

+++ b/src/cmd/ld/Makefile

@@ -1,0 +1,23 @@

+.POSIX:

+PROJECTDIR = ../../..

+include $(PROJECTDIR)/scripts/rules.mk

+TARGET = $(BINDIR)/ld

+OBJS = main.o \

+       symbol.o \

+       pass1.o \

+       pass2.o \

+       pass3.o \

+all: $(TARGET)

+#TODO Add library dependencies

+$(TARGET): $(OBJS)

+	$(CC) $(SCC_LDFLAGS) $(OBJS) -lmach -lscc -o $@

+dep: inc-dep

+clean:

+	rm -f $(OBJS)

--- /dev/null

+++ b/src/cmd/ld/deps.mk

@@ -1,0 +1,14 @@

+#deps

+./main.o: $(INCDIR)/scc/scc/syslibs.h

+./main.o: ./ld.h

+./pass1.o: $(INCDIR)/scc/scc/ar.h

+./pass1.o: $(INCDIR)/scc/scc/mach.h

+./pass1.o: $(INCDIR)/scc/scc/scc.h

+./pass1.o: ./ld.h

+./pass2.o: $(INCDIR)/scc/scc/mach.h

+./pass2.o: ./ld.h

+./pass3.o: $(INCDIR)/scc/scc/mach.h

+./pass3.o: ./ld.h

+./symbol.o: $(INCDIR)/scc/scc/mach.h

+./symbol.o: $(INCDIR)/scc/scc/scc.h

+./symbol.o: ./ld.h

--- /dev/null

+++ b/src/cmd/ld/ld.h

@@ -1,0 +1,70 @@

+struct obj;

+struct objsym;

+typedef struct objlst Objlst;

+typedef struct symbol Symbol;

+typedef struct section Section;

+enum {

+	NOINSTALL,

+	INSTALL,

+};

+enum {

+	OUTLIB,

+	INLIB,

+};

+struct section {

+	char *name;

+	unsigned long base;

+	unsigned long long size;

+	unsigned flags;

+	int type;

+	FILE *fp;

+	Section *next;

+};

+struct objlst {

+	struct obj *obj;

+	struct objlst *next;

+};

+struct symbol {

+	char *name;

+	struct obj *obj;

+	struct objsym *def;

+	unsigned long long size, value;

+	struct symbol *next, *prev;

+	struct symbol *hash;

+};

+/* passes */

+extern void pass1(int argc, char *argv[]);

+extern void pass2(int argc, char *argv[]);

+extern void pass3(int argc, char *argv[]);

+/* main.c */

+extern char *errstr(void);

+extern void error(char *fmt, ...);

+/* symbol.c */

+extern Symbol *lookup(char *name, int install);

+extern Symbol *define(struct objsym *osym, struct obj *obj);

+extern int newsym(struct objsym *osym, struct obj *obj);

+extern int moreundef(void);

+extern void listundef(void);

+extern int defasym(struct obj *obj);

+/* globals */

+extern char *filename, *membname;

+extern unsigned long textsiz, datasiz, bsssiz;

+extern unsigned long textbase, database, bssbase;

+extern int sflag;

+extern int xflag;

+extern int Xflag;

+extern int rflag;

+extern int dflag;

+extern int gflag;

+extern char *Dflag;

+extern Objlst *objhead, *objlast;

--- /dev/null

+++ b/src/cmd/ld/main.c

@@ -1,0 +1,160 @@

+static char sccsid[] = "@(#) ./ld/main.c";

+#include <errno.h>

+#include <stdarg.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+#include <scc/syslibs.h>

+#include "ld.h"

+char *output = "a.out", *entry = "start";

+char *filename, *membname;

+unsigned long textsiz, datasiz, bsssiz;

+unsigned long textbase, database, bssbase;

+int sflag;        /* discard all the symbols */

+int xflag;        /* discard local symbols */

+int Xflag;        /* discard locals starting with 'L' */

+int rflag;        /* preserve relocation bits */

+int dflag;        /* define common even with rflag */

+int gflag;        /* preserve debug symbols */

+char *Dflag;      /* size of data */

+static int status;

+char *

+errstr(void)

+{

+	return strerror(errno);

+}

+void

+error(char *fmt, ...)

+{

+	va_list va;

+	va_start(va, fmt);

+	fprintf(stderr, "ld: %s: ", filename);

+	if (membname)

+		fprintf(stderr, "%s: ", membname);

+	vfprintf(stderr, fmt, va);

+	putc('\n', stderr);

+	va_end(va);

+	status = EXIT_FAILURE;

+}

+static void

+cleanup(void)

+{

+	if (status != EXIT_FAILURE)

+		remove(output);

+}

+static void

+usage(void)

+{

+	fputs("usage: ld [options] file ...\n", stderr);

+	exit(EXIT_FAILURE);

+}

+static void

+Lpath(char *path)

+{

+	char **bp, **end;

+	end = &syslibs[MAX_LIB_PATHS];

+	for (bp = syslibs; bp < end && *bp; ++bp)

+		;

+	if (bp == end) {

+		fputs("ld: too many -L options\n", stderr);

+		exit(1);

+	}

+	*bp = path;

+}

+int

+main(int argc, char *argv[])

+{

+	char *cp, **p;

+	for (--argc; *++argv; --argc) {

+		if (argv[0][0] != '-' || argv[0][1] == 'l')

+			break;

+		if (argv[0][1] == '-') {

+			--argc, ++argv;

+			break;

+		}

+		for (cp = &argv[0][1]; *cp; ++cp) {

+			switch (*cp) {

+			case 's':

+				sflag = 1;

+				break;

+			case 'x':

+				xflag = 1;

+				break;

+			case 'X':

+				Xflag = 1;

+				break;

+			case 'r':

+				rflag = 1;

+				break;

+			case 'd':

+				dflag = 1;

+				break;

+			case 'i':

+			case 'n':

+				/* TODO */

+				break;

+			case 'L':

+				if (argc == 0)

+					goto usage;

+				++argv, --argc;

+				Lpath(*argv);

+				break;

+			case 'u':

+				if (argc == 0)

+					goto usage;

+				++argv, --argc;

+				lookup(*argv, INSTALL);

+				break;

+			case 'o':

+				if (argc == 0)

+					goto usage;

+				++argv, --argc;

+				output = *argv;

+				break;

+			case 'e':

+				if (argc == 0)

+					goto usage;

+				++argv, --argc;

+				entry = *argv;

+				break;

+			case 'D':

+				if (argc == 0)

+					goto usage;

+				++argv, --argc;

+				Dflag = *argv;

+				break;

+			default:

+			usage:

+				usage();

+			}

+		}

+	}

+	if (argc == 0)

+		usage();

+	atexit(cleanup);

+	pass1(argc, argv);

+	pass2(argc, argv);

+	pass3(argc, argv);

+	return status;

+}

--- /dev/null

+++ b/src/cmd/ld/pass1.c

@@ -1,0 +1,238 @@

+#include <stdarg.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+#include <scc/mach.h>

+#include <scc/scc.h>

+#include <scc/ar.h>

+#include "ld.h"

+static int bintype = -1;

+Objlst *objhead, *objlast;

+static void

+loadobj(Obj *obj, FILE *fp)

+{

+	int n;

+	Objlst *lst;

+	Objsym *sym;

+	Objsect *secp;

+	if ((lst = malloc(sizeof(*lst))) == NULL) {

+		error("out of memory");

+		return;

+	}

+	lst->obj = obj;

+	lst->next = NULL;

+	if (!objlast)

+		objlast = objhead = lst;

+	else

+		objlast = objlast->next = lst;

+	for (sym = obj->syms; sym; sym = sym->next)

+		newsym(sym, obj);

+}

+static void

+newobject(FILE *fp, int type, int inlib)

+{

+	Obj *obj;

+	if ((obj = objnew(type)) == NULL) {

+		error("out of memory");

+		return;

+	}

+	if (bintype != -1 && bintype != type) {

+		error("not compatible object file");

+		goto delete;

+	}

+	bintype = type;

+	if (objread(obj, fp) < 0) {

+		error("object file corrupted");

+		goto delete;

+	}

+	if (objsyms(obj) < 0 || objsect(obj) < 0) {

+		error("object file corrupted");

+		goto delete;

+	}

+	/*

+	 * we add the object to the list of objects

+	 * if we are not in a library without index,

+	 * or in that case if the library defines

+	 * some symbol needed.

+	 */

+	if (!inlib || defasym(obj)) {

+		loadobj(obj, fp);

+		return;

+	}

+ delete:

+	objdel(obj);

+	return;

+}

+static void

+loadlib(FILE *fp)

+{

+	int t, loaded;

+	long n;

+	Objsymdef *def, *dp;

+	Symbol *sym;

+	if (getindex(bintype, &n, &def, fp) < 0) {

+		error("corrupted index");

+		return;

+	}

+	loaded = 1;

+	while (moreundef() && loaded) {

+		loaded = 0;

+		for (dp = def; dp; dp = dp->next) {

+			sym = lookup(dp->name, NOINSTALL);

+			if (!sym || sym->def)

+				continue;

+			if (fseek(fp, dp->offset, SEEK_SET) == EOF) {

+				error(errstr());

+				goto clean;

+			}

+			if ((t = objtype(fp, NULL)) == -1) {

+				error("library file corrupted");

+				goto clean;

+			}

+			if (t != bintype) {

+				error("incompatible library");

+				goto clean;

+			}

+			newobject(fp, t, OUTLIB);

+			loaded = 1;

+		}

+	}

+clean:

+	free(def);

+}

+static int

+newmember(FILE *fp, char *name, void *data)

+{

+	int t;

+	int *nmemb = data;

+	if (bintype == -1) {

+		error("an object file is needed before any library");

+		return 0;

+	}

+	if (*nmemb++ == 0) {

+		if (!strncmp(name, "/", SARNAM) ||

+		    !strncmp(name, "__.SYMDEF", SARNAM)) {

+			loadlib(fp);

+			return 0;

+		}

+	}

+	membname = name;

+	if ((t = objtype(fp, NULL)) == -1)

+		return 1;

+	if (bintype != t) {

+		error("wrong object file format");

+		return 1;

+	}

+	newobject(fp, t, INLIB);

+	membname = NULL;

+	return 1;

+}

+static int

+newlibrary(FILE *fp)

+{

+	int nmemb = 0;

+	return formember(fp, newmember, &nmemb);

+}

+static FILE *

+openfile(char *name, char *buffer)

+{

+	size_t pathlen, len;

+	FILE *fp;

+	char **bp;

+	char libname[FILENAME_MAX];

+	extern char *syslibs[];

+	filename = name;

+	membname = NULL;

+	if (name[0] != '-' || name[1] != 'l') {

+		if ((fp = fopen(name, "rb")) == NULL)

+			error(errstr());

+		return fp;

+	}

+	len = strlen(name+2) + 3;

+	if (len > FILENAME_MAX-1) {

+		error("library name too long");

+		return NULL;

+	}

+	strcat(strcpy(buffer, "lib"), name+2);

+	filename = buffer;

+	if ((fp = fopen(libname, "rb")) != NULL)

+		return fp;

+	for (bp = syslibs; *bp; ++bp) {

+		pathlen = strlen(*bp);

+		if (pathlen + len > FILENAME_MAX-1)

+			continue;

+		memcpy(libname, *bp, pathlen);

+		memcpy(libname+pathlen+1, buffer, len);

+		buffer[pathlen] = '/';

+		if ((fp = fopen(buffer, "rb")) != NULL)

+			return fp;

+	}

+	error("not found");

+	return NULL;

+}

+/*

+ * Get the list of object files that are going to be linked

+ */

+void

+pass1(int argc, char *argv[])

+{

+	int t;

+	FILE *fp;

+	char buff[FILENAME_MAX];

+	for ( ; *argv; ++argv) {

+		if ((fp = openfile(*argv, buff)) == NULL)

+			continue;

+		if ((t = objtype(fp, NULL)) != -1)

+			newobject(fp, t, OUTLIB);

+		else if (archive(fp))

+			newlibrary(fp);

+		else

+			error("bad format");

+	}

+	if (moreundef()) {

+		listundef();

+		exit(EXIT_FAILURE);

+	}

+}

--- /dev/null

+++ b/src/cmd/ld/pass2.c

@@ -1,0 +1,53 @@

+#include <stdlib.h>

+#include <stdio.h>

+#include <limits.h>

+#include <scc/mach.h>

+#include "ld.h"

+static unsigned long long

+sectsize(int type)

+{

+	unsigned long long size;

+	Objlst *lp;

+	Objsect *sp;

+	size = 0;

+	for (lp = objhead; lp; lp = lp->next) {

+		for (sp = lp->obj->secs; sp; sp = sp->next) {

+			if (sp->type != type)

+				continue;

+			size += sp->size;

+		}

+	}

+	return size;

+}

+/*

+ * calculate the size of every segment

+ */

+void

+pass2(int argc, char *argv[])

+{

+	unsigned long long n;

+	char *end;

+	Objsect *sp;

+	datasiz = bsssiz = textsiz = 0;

+	textsiz = sectsize('T');

+	datasiz = sectsize('D');

+	bsssiz = sectsize('B');

+	if (Dflag) {

+		n = strtoull(Dflag, &end, 0);

+		if (n == ULLONG_MAX || *end != '\0') {

+			error("incorrect -D value");

+			exit(EXIT_FAILURE);

+		}

+		if (n > datasiz)

+			datasiz = n;

+	}

+}

--- /dev/null

+++ b/src/cmd/ld/pass3.c

@@ -1,0 +1,34 @@

+#include <stdio.h>

+#include <stdlib.h>

+#include <scc/mach.h>

+#include "ld.h"

+/*

+ * relocate the sections

+ */

+void

+pass3(int argc, char *argv[])

+{

+	Obj *obj;

+	Objlst *lst;

+	Objsect *sp;

+	unsigned long long text, data, bss;

+	textbase = text = 0;

+	database = data = textsiz+3 & ~3;

+	bssbase = bss = data+datasiz+3 & ~3;

+	for (lst = objhead; lst; lst = lst->next) {

+		for (sp = lst->obj->secs; sp; sp = sp->next) {

+			switch (sp->type) {

+			case 'T':

+			case 'D':

+			case 'B':

+			default:

+				abort();

+			}

+		}

+	}

+}

--- /dev/null

+++ b/src/cmd/ld/symbol.c

@@ -1,0 +1,146 @@

+#include <ctype.h>

+#include <stdio.h>

+#include <stdlib.h>

+#include <string.h>

+#include <scc/mach.h>

+#include <scc/scc.h>

+#include "ld.h"

+#define NR_SYMBOL 128

+static Symbol *symtab[NR_SYMBOL];

+static Symbol refhead = {

+	.next = &refhead,

+	.prev = &refhead,

+};

+Symbol *

+lookup(char *name, int install)

+{

+	size_t len;

+	char *s;

+	unsigned h;

+	Symbol *sym;

+	h = genhash(name) % NR_SYMBOL;

+	for (sym = symtab[h]; sym; sym = sym->hash) {

+		if (!strcmp(name, sym->name))

+			return sym;

+	}

+	if (!install)

+		return NULL;

+	len = strlen(name) + 1;

+	sym = malloc(sizeof(*sym));

+	s = malloc(len);

+	if (!len || !s) {

+		error("out of memory");

+		exit(EXIT_FAILURE);

+	}

+	sym->obj = NULL;

+	sym->name = memcpy(s, name, len);

+	sym->hash = symtab[h];

+	symtab[h] = sym;

+	sym->value = 0;

+	sym->size = 0;

+	refhead.next->prev = sym;

+	sym->next = refhead.next;

+	refhead.next = sym;

+	sym->prev = &refhead;

+	return sym;

+}

+Symbol *

+define(Objsym *osym, Obj *obj)

+{

+	Symbol *sym = lookup(osym->name, INSTALL);

+	if (sym->def && sym->def->type != 'C') {

+		error("%s: symbol redefined", osym->name);

+		return NULL;

+	}

+	sym->obj = obj;

+	sym->def = osym;

+	sym->size = osym->size;

+	sym->value = osym->value;

+	sym->next->prev = sym->prev;

+	sym->prev->next = sym->next;

+	sym->next = sym->prev = NULL;

+	return sym;

+}

+int

+newsym(Objsym *osym, Obj *obj)

+{

+	Symbol *sym;

+	switch (osym->type) {

+	case 'U':

+		lookup(osym->name, INSTALL);

+	case '?':

+	case 'N':

+		break;

+	case 'C':

+		sym = lookup(osym->name, NOINSTALL);

+		if (!sym || !sym->def) {

+			define(osym, obj);

+			break;

+		}

+		if (sym->def->type != 'C')

+			break;

+		if (sym->size < osym->size)

+			sym->size = osym->size;

+		break;

+	default:

+		if (isupper(osym->type))

+			define(osym, obj);

+		break;

+	}

+	return 1;

+}

+int

+moreundef(void)

+{

+	return refhead.next != &refhead;

+}

+void

+listundef(void)

+{

+	Symbol *sym, *p;

+	p = &refhead;

+	for (sym = p->next; sym != p; sym = sym->next) {

+		fprintf(stderr,

+		        "ld: symbol '%s' not defined\n",

+		        sym->name);

+	}

+}

+int

+defasym(Obj *obj)

+{

+	Symbol *sym, *p;

+	p = &refhead;

+	for (sym = p->next; sym != p; sym = sym->next) {

+		if (objlookup(obj, sym->name, 0))

+			return 1;

+	}

+	return 0;

+}

--- a/src/libmach/objread.c

+++ b/src/libmach/objread.c

@@ -19,5 +19,7 @@

 	if ((*funv[fmt])(obj, fp) < 0)

 		return -1;

+	obj->fp = fp;

 	return 0;