src/liblink/data.c

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This source file includes following definitions.
mangle
symgrow
savedata
addrel
setuintxx
adduintxx
adduint8
adduint16
adduint32
adduint64
setuint8
setuint16
setuint32
setuint64
addaddrplus
addpcrelplus
addaddr
setaddrplus
setaddr
addsize
addaddrplus4
// 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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root/src/liblink/data.c

DEFINITIONS
