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-rw-r--r--src/libmach/obj.c391
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diff --git a/src/libmach/obj.c b/src/libmach/obj.c
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+// Inferno libmach/obj.c
+// http://code.google.com/p/inferno-os/source/browse/utils/libmach/obj.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc.
+// Power PC support Copyright © 1995-2004 C H Forsyth (forsyth@terzarima.net).
+// Portions Copyright © 1997-1999 Vita Nuova Limited.
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).
+// Revisions Copyright © 2000-2004 Lucent Technologies Inc. and others.
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+/*
+ * obj.c
+ * routines universal to all object files
+ */
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <ar.h>
+#include <mach.h>
+#include "obj.h"
+
+#define islocal(t) ((t)=='a' || (t)=='p')
+
+enum
+{
+ NNAMES = 50,
+ MAXIS = 8, /* max length to determine if a file is a .? file */
+ MAXOFF = 0x7fffffff, /* larger than any possible local offset */
+ NHASH = 1024, /* must be power of two */
+ HASHMUL = 79L,
+};
+
+int _is2(char*), /* in [$OS].c */
+ _is5(char*),
+ _is6(char*),
+ _is7(char*),
+ _is8(char*),
+ _is9(char*),
+ _isk(char*),
+ _isq(char*),
+ _isv(char*),
+ _isu(char*),
+ _read2(Biobuf*, Prog*),
+ _read5(Biobuf*, Prog*),
+ _read6(Biobuf*, Prog*),
+ _read7(Biobuf*, Prog*),
+ _read8(Biobuf*, Prog*),
+ _read9(Biobuf*, Prog*),
+ _readk(Biobuf*, Prog*),
+ _readq(Biobuf*, Prog*),
+ _readv(Biobuf*, Prog*),
+ _readu(Biobuf*, Prog*);
+
+typedef struct Obj Obj;
+typedef struct Symtab Symtab;
+
+struct Obj /* functions to handle each intermediate (.$O) file */
+{
+ char *name; /* name of each $O file */
+ int (*is)(char*); /* test for each type of $O file */
+ int (*read)(Biobuf*, Prog*); /* read for each type of $O file*/
+};
+
+static Obj obj[] =
+{ /* functions to identify and parse each type of obj */
+ [Obj68020] = { "68020 .2", _is2, _read2 },
+ [ObjAmd64] = { "amd64 .6", _is6 , _read6 },
+ [ObjArm] = { "arm .5", _is5, _read5 },
+ [ObjAlpha] = { "alpha .7", _is7, _read7 },
+ [Obj386] = { "386 .8", _is8, _read8 },
+ [ObjSparc] = { "sparc .k", _isk, _readk },
+ [ObjPower] = { "power .q", _isq, _readq },
+ [ObjMips] = { "mips .v", _isv, _readv },
+ [ObjSparc64] = { "sparc64 .u", _isu, _readu },
+ [ObjPower64] = { "power64 .9", _is9, _read9 },
+ [Maxobjtype] = { 0, 0, 0 }
+};
+
+struct Symtab
+{
+ struct Sym s;
+ struct Symtab *next;
+};
+
+static Symtab *hash[NHASH];
+static Sym *names[NNAMES]; /* working set of active names */
+
+static int processprog(Prog*,int); /* decode each symbol reference */
+static void objreset(void);
+static void objlookup(int, char *, int, uint);
+static void objupdate(int, int);
+
+static int sequence;
+
+int
+objtype(Biobuf *bp, char **name)
+{
+ int i;
+ char buf[MAXIS];
+ int c;
+ char *p;
+
+ /*
+ * Look for import block.
+ */
+ p = Brdline(bp, '\n');
+ if(p == nil)
+ return -1;
+ if(Blinelen(bp) < 10 || strncmp(p, "go object ", 10) != 0)
+ return -1;
+ Bseek(bp, -1, 1);
+
+ /*
+ * Found one. Skip until "\n!\n"
+ */
+ for(;;) {
+ if((c = Bgetc(bp)) == Beof)
+ return -1;
+ if(c != '\n')
+ continue;
+ c = Bgetc(bp);
+ if(c != '!'){
+ Bungetc(bp);
+ continue;
+ }
+ c = Bgetc(bp);
+ if(c != '\n'){
+ Bungetc(bp);
+ continue;
+ }
+ break;
+ }
+
+ if(Bread(bp, buf, MAXIS) < MAXIS)
+ return -1;
+ Bseek(bp, -MAXIS, 1);
+ for (i = 0; i < Maxobjtype; i++) {
+ if (obj[i].is && (*obj[i].is)(buf)) {
+ if (name)
+ *name = obj[i].name;
+ return i;
+ }
+ }
+
+ return -1;
+}
+
+int
+isar(Biobuf *bp)
+{
+ int n;
+ char magbuf[SARMAG];
+
+ n = Bread(bp, magbuf, SARMAG);
+ if(n == SARMAG && strncmp(magbuf, ARMAG, SARMAG) == 0)
+ return 1;
+ return 0;
+}
+
+/*
+ * determine what kind of object file this is and process it.
+ * return whether or not this was a recognized intermediate file.
+ */
+int
+readobj(Biobuf *bp, int objtype)
+{
+ Prog p;
+
+ if (objtype < 0 || objtype >= Maxobjtype || obj[objtype].is == 0)
+ return 1;
+ objreset();
+ while ((*obj[objtype].read)(bp, &p))
+ if (!processprog(&p, 1))
+ return 0;
+ return 1;
+}
+
+int
+readar(Biobuf *bp, int objtype, vlong end, int doautos)
+{
+ Prog p;
+
+ if (objtype < 0 || objtype >= Maxobjtype || obj[objtype].is == 0)
+ return 1;
+ objreset();
+ while ((*obj[objtype].read)(bp, &p) && Boffset(bp) < end)
+ if (!processprog(&p, doautos))
+ return 0;
+ return 1;
+}
+
+/*
+ * decode a symbol reference or definition
+ */
+static int
+processprog(Prog *p, int doautos)
+{
+ if(p->kind == aNone)
+ return 1;
+ if((schar)p->sym < 0 || p->sym >= NNAMES)
+ return 0;
+ switch(p->kind)
+ {
+ case aName:
+ if (!doautos)
+ if(p->type != 'U' && p->type != 'b')
+ break;
+ objlookup(p->sym, p->id, p->type, p->sig);
+ break;
+ case aText:
+ objupdate(p->sym, 'T');
+ break;
+ case aData:
+ objupdate(p->sym, 'D');
+ break;
+ default:
+ break;
+ }
+ return 1;
+}
+
+/*
+ * find the entry for s in the symbol array.
+ * make a new entry if it is not already there.
+ */
+static void
+objlookup(int id, char *name, int type, uint sig)
+{
+ int32 h;
+ char *cp;
+ Sym *s;
+ Symtab *sp;
+
+ s = names[id];
+ if(s && strcmp(s->name, name) == 0) {
+ s->type = type;
+ s->sig = sig;
+ return;
+ }
+
+ h = *name;
+ for(cp = name+1; *cp; h += *cp++)
+ h *= HASHMUL;
+ h &= NHASH-1;
+ if (type == 'U' || type == 'b' || islocal(type)) {
+ for(sp = hash[h]; sp; sp = sp->next)
+ if(strcmp(sp->s.name, name) == 0) {
+ switch(sp->s.type) {
+ case 'T':
+ case 'D':
+ case 'U':
+ if (type == 'U') {
+ names[id] = &sp->s;
+ return;
+ }
+ break;
+ case 't':
+ case 'd':
+ case 'b':
+ if (type == 'b') {
+ names[id] = &sp->s;
+ return;
+ }
+ break;
+ case 'a':
+ case 'p':
+ if (islocal(type)) {
+ names[id] = &sp->s;
+ return;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ }
+ sp = malloc(sizeof(Symtab));
+ sp->s.name = name;
+ sp->s.type = type;
+ sp->s.sig = sig;
+ sp->s.value = islocal(type) ? MAXOFF : 0;
+ sp->s.sequence = sequence++;
+ names[id] = &sp->s;
+ sp->next = hash[h];
+ hash[h] = sp;
+ return;
+}
+/*
+ * traverse the symbol lists
+ */
+void
+objtraverse(void (*fn)(Sym*, void*), void *pointer)
+{
+ int i;
+ Symtab *s;
+
+ for(i = 0; i < NHASH; i++)
+ for(s = hash[i]; s; s = s->next)
+ (*fn)(&s->s, pointer);
+}
+
+/*
+ * update the offset information for a 'a' or 'p' symbol in an intermediate file
+ */
+void
+_offset(int id, vlong off)
+{
+ Sym *s;
+
+ s = names[id];
+ if (s && s->name[0] && islocal(s->type) && s->value > off)
+ s->value = off;
+}
+
+/*
+ * update the type of a global text or data symbol
+ */
+static void
+objupdate(int id, int type)
+{
+ Sym *s;
+
+ s = names[id];
+ if (s && s->name[0])
+ if (s->type == 'U')
+ s->type = type;
+ else if (s->type == 'b')
+ s->type = tolower(type);
+}
+
+/*
+ * look for the next file in an archive
+ */
+int
+nextar(Biobuf *bp, int offset, char *buf)
+{
+ struct ar_hdr a;
+ int i, r;
+ int32 arsize;
+
+ if (offset&01)
+ offset++;
+ Bseek(bp, offset, 0);
+ r = Bread(bp, &a, SAR_HDR);
+ if(r != SAR_HDR)
+ return 0;
+ if(strncmp(a.fmag, ARFMAG, sizeof(a.fmag)))
+ return -1;
+ for(i=0; i<sizeof(a.name) && i<SARNAME && a.name[i] != ' '; i++)
+ buf[i] = a.name[i];
+ buf[i] = 0;
+ arsize = strtol(a.size, 0, 0);
+ if (arsize&1)
+ arsize++;
+ return arsize + SAR_HDR;
+}
+
+static void
+objreset(void)
+{
+ int i;
+ Symtab *s, *n;
+
+ for(i = 0; i < NHASH; i++) {
+ for(s = hash[i]; s; s = n) {
+ n = s->next;
+ free(s->s.name);
+ free(s);
+ }
+ hash[i] = 0;
+ }
+ memset(names, 0, sizeof names);
+}
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