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-rw-r--r--src/liblink/data.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/src/liblink/data.c b/src/liblink/data.c
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--- /dev/null
+++ b/src/liblink/data.c
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+// Derived from Inferno utils/6l/obj.c and utils/6l/span.c
+// http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c
+// http://code.google.com/p/inferno-os/source/browse/utils/6l/span.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 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.
+
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <link.h>
+
+void
+mangle(char *file)
+{
+ sysfatal("%s: mangled input file", file);
+}
+
+void
+symgrow(Link *ctxt, LSym *s, vlong lsiz)
+{
+ int32 siz;
+
+ USED(ctxt);
+
+ siz = (int32)lsiz;
+ if((vlong)siz != lsiz)
+ sysfatal("symgrow size %lld too long", lsiz);
+
+ if(s->np >= siz)
+ return;
+
+ if(s->np > s->maxp) {
+ ctxt->cursym = s;
+ sysfatal("corrupt symbol data: np=%lld > maxp=%lld", (vlong)s->np, (vlong)s->maxp);
+ }
+
+ if(s->maxp < siz) {
+ if(s->maxp == 0)
+ s->maxp = 8;
+ while(s->maxp < siz)
+ s->maxp <<= 1;
+ s->p = erealloc(s->p, s->maxp);
+ memset(s->p+s->np, 0, s->maxp-s->np);
+ }
+ s->np = siz;
+}
+
+void
+savedata(Link *ctxt, LSym *s, Prog *p, char *pn)
+{
+ int32 off, siz, i, fl;
+ float32 flt;
+ uchar *cast;
+ vlong o;
+ Reloc *r;
+
+ off = p->from.offset;
+ siz = ctxt->arch->datasize(p);
+ if(off < 0 || siz < 0 || off >= 1<<30 || siz >= 100)
+ mangle(pn);
+ symgrow(ctxt, s, off+siz);
+
+ if(p->to.type == ctxt->arch->D_FCONST) {
+ switch(siz) {
+ default:
+ case 4:
+ flt = p->to.u.dval;
+ cast = (uchar*)&flt;
+ for(i=0; i<4; i++)
+ s->p[off+i] = cast[fnuxi4[i]];
+ break;
+ case 8:
+ cast = (uchar*)&p->to.u.dval;
+ for(i=0; i<8; i++)
+ s->p[off+i] = cast[fnuxi8[i]];
+ break;
+ }
+ } else if(p->to.type == ctxt->arch->D_SCONST) {
+ for(i=0; i<siz; i++)
+ s->p[off+i] = p->to.u.sval[i];
+ } else if(p->to.type == ctxt->arch->D_CONST) {
+ if(p->to.sym)
+ goto addr;
+ o = p->to.offset;
+ fl = o;
+ cast = (uchar*)&fl;
+ switch(siz) {
+ default:
+ ctxt->diag("bad nuxi %d\n%P", siz, p);
+ break;
+ case 1:
+ s->p[off] = cast[inuxi1[0]];
+ break;
+ case 2:
+ for(i=0; i<2; i++)
+ s->p[off+i] = cast[inuxi2[i]];
+ break;
+ case 4:
+ for(i=0; i<4; i++)
+ s->p[off+i] = cast[inuxi4[i]];
+ break;
+ case 8:
+ cast = (uchar*)&o;
+ for(i=0; i<8; i++)
+ s->p[off+i] = cast[inuxi8[i]];
+ break;
+ }
+ } else if(p->to.type == ctxt->arch->D_ADDR) {
+ addr:
+ r = addrel(s);
+ r->off = off;
+ r->siz = siz;
+ r->sym = p->to.sym;
+ r->type = R_ADDR;
+ r->add = p->to.offset;
+ } else {
+ ctxt->diag("bad data: %P", p);
+ }
+}
+
+Reloc*
+addrel(LSym *s)
+{
+ if(s->nr >= s->maxr) {
+ if(s->maxr == 0)
+ s->maxr = 4;
+ else
+ s->maxr <<= 1;
+ s->r = erealloc(s->r, s->maxr*sizeof s->r[0]);
+ memset(s->r+s->nr, 0, (s->maxr-s->nr)*sizeof s->r[0]);
+ }
+ return &s->r[s->nr++];
+}
+
+vlong
+setuintxx(Link *ctxt, LSym *s, vlong off, uint64 v, vlong wid)
+{
+ int32 i, fl;
+ vlong o;
+ uchar *cast;
+
+ if(s->type == 0)
+ s->type = SDATA;
+ s->reachable = 1;
+ if(s->size < off+wid) {
+ s->size = off+wid;
+ symgrow(ctxt, s, s->size);
+ }
+ fl = v;
+ cast = (uchar*)&fl;
+ switch(wid) {
+ case 1:
+ s->p[off] = cast[inuxi1[0]];
+ break;
+ case 2:
+ for(i=0; i<2; i++)
+ s->p[off+i] = cast[inuxi2[i]];
+ break;
+ case 4:
+ for(i=0; i<4; i++)
+ s->p[off+i] = cast[inuxi4[i]];
+ break;
+ case 8:
+ o = v;
+ cast = (uchar*)&o;
+ for(i=0; i<8; i++)
+ s->p[off+i] = cast[inuxi8[i]];
+ break;
+ }
+ return off+wid;
+}
+
+vlong
+adduintxx(Link *ctxt, LSym *s, uint64 v, int wid)
+{
+ vlong off;
+
+ off = s->size;
+ setuintxx(ctxt, s, off, v, wid);
+ return off;
+}
+
+vlong
+adduint8(Link *ctxt, LSym *s, uint8 v)
+{
+ return adduintxx(ctxt, s, v, 1);
+}
+
+vlong
+adduint16(Link *ctxt, LSym *s, uint16 v)
+{
+ return adduintxx(ctxt, s, v, 2);
+}
+
+vlong
+adduint32(Link *ctxt, LSym *s, uint32 v)
+{
+ return adduintxx(ctxt, s, v, 4);
+}
+
+vlong
+adduint64(Link *ctxt, LSym *s, uint64 v)
+{
+ return adduintxx(ctxt, s, v, 8);
+}
+
+vlong
+setuint8(Link *ctxt, LSym *s, vlong r, uint8 v)
+{
+ return setuintxx(ctxt, s, r, v, 1);
+}
+
+vlong
+setuint16(Link *ctxt, LSym *s, vlong r, uint16 v)
+{
+ return setuintxx(ctxt, s, r, v, 2);
+}
+
+vlong
+setuint32(Link *ctxt, LSym *s, vlong r, uint32 v)
+{
+ return setuintxx(ctxt, s, r, v, 4);
+}
+
+vlong
+setuint64(Link *ctxt, LSym *s, vlong r, uint64 v)
+{
+ return setuintxx(ctxt, s, r, v, 8);
+}
+
+vlong
+addaddrplus(Link *ctxt, LSym *s, LSym *t, vlong add)
+{
+ vlong i;
+ Reloc *r;
+
+ if(s->type == 0)
+ s->type = SDATA;
+ s->reachable = 1;
+ i = s->size;
+ s->size += ctxt->arch->ptrsize;
+ symgrow(ctxt, s, s->size);
+ r = addrel(s);
+ r->sym = t;
+ r->off = i;
+ r->siz = ctxt->arch->ptrsize;
+ r->type = R_ADDR;
+ r->add = add;
+ return i + r->siz;
+}
+
+vlong
+addpcrelplus(Link *ctxt, LSym *s, LSym *t, vlong add)
+{
+ vlong i;
+ Reloc *r;
+
+ if(s->type == 0)
+ s->type = SDATA;
+ s->reachable = 1;
+ i = s->size;
+ s->size += 4;
+ symgrow(ctxt, s, s->size);
+ r = addrel(s);
+ r->sym = t;
+ r->off = i;
+ r->add = add;
+ r->type = R_PCREL;
+ r->siz = 4;
+ return i + r->siz;
+}
+
+vlong
+addaddr(Link *ctxt, LSym *s, LSym *t)
+{
+ return addaddrplus(ctxt, s, t, 0);
+}
+
+vlong
+setaddrplus(Link *ctxt, LSym *s, vlong off, LSym *t, vlong add)
+{
+ Reloc *r;
+
+ if(s->type == 0)
+ s->type = SDATA;
+ s->reachable = 1;
+ if(off+ctxt->arch->ptrsize > s->size) {
+ s->size = off + ctxt->arch->ptrsize;
+ symgrow(ctxt, s, s->size);
+ }
+ r = addrel(s);
+ r->sym = t;
+ r->off = off;
+ r->siz = ctxt->arch->ptrsize;
+ r->type = R_ADDR;
+ r->add = add;
+ return off + r->siz;
+}
+
+vlong
+setaddr(Link *ctxt, LSym *s, vlong off, LSym *t)
+{
+ return setaddrplus(ctxt, s, off, t, 0);
+}
+
+vlong
+addsize(Link *ctxt, LSym *s, LSym *t)
+{
+ vlong i;
+ Reloc *r;
+
+ if(s->type == 0)
+ s->type = SDATA;
+ s->reachable = 1;
+ i = s->size;
+ s->size += ctxt->arch->ptrsize;
+ symgrow(ctxt, s, s->size);
+ r = addrel(s);
+ r->sym = t;
+ r->off = i;
+ r->siz = ctxt->arch->ptrsize;
+ r->type = R_SIZE;
+ return i + r->siz;
+}
+
+vlong
+addaddrplus4(Link *ctxt, LSym *s, LSym *t, vlong add)
+{
+ vlong i;
+ Reloc *r;
+
+ if(s->type == 0)
+ s->type = SDATA;
+ s->reachable = 1;
+ i = s->size;
+ s->size += 4;
+ symgrow(ctxt, s, s->size);
+ r = addrel(s);
+ r->sym = t;
+ r->off = i;
+ r->siz = 4;
+ r->type = R_ADDR;
+ r->add = add;
+ return i + r->siz;
+}
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