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// Inferno libmach/8obj.c
// http://code.google.com/p/inferno-os/source/browse/utils/libmach/8obj.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.
/*
* 8obj.c - identify and parse a 386 object file
*/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>
#include "../cmd/8l/8.out.h"
#include "obj.h"
typedef struct Addr Addr;
struct Addr
{
char sym;
char flags;
char gotype;
};
static Addr addr(Biobuf*);
static char type2char(int);
static void skip(Biobuf*, int);
int
_is8(char *t)
{
uchar *s = (uchar*)t;
return s[0] == (ANAME&0xff) /* also = ANAME */
&& s[1] == ((ANAME>>8)&0xff)
&& s[2] == D_FILE /* type */
&& s[3] == 1 /* sym */
&& s[4] == '<'; /* name of file */
}
int
_read8(Biobuf *bp, Prog* p)
{
int as, n, c;
Addr a;
as = BGETC(bp); /* as(low) */
if(as < 0)
return 0;
c = BGETC(bp); /* as(high) */
if(c < 0)
return 0;
as |= ((c & 0xff) << 8);
p->kind = aNone;
p->sig = 0;
if(as == ANAME || as == ASIGNAME){
if(as == ASIGNAME){
Bread(bp, &p->sig, 4);
p->sig = leswal(p->sig);
}
p->kind = aName;
p->type = type2char(BGETC(bp)); /* type */
p->sym = BGETC(bp); /* sym */
n = 0;
for(;;) {
as = BGETC(bp);
if(as < 0)
return 0;
n++;
if(as == 0)
break;
}
p->id = malloc(n);
if(p->id == 0)
return 0;
Bseek(bp, -n, 1);
if(Bread(bp, p->id, n) != n)
return 0;
return 1;
}
if(as == ATEXT)
p->kind = aText;
if(as == AGLOBL)
p->kind = aData;
skip(bp, 4); /* lineno(4) */
a = addr(bp);
addr(bp);
if(!(a.flags & T_SYM))
p->kind = aNone;
p->sym = a.sym;
return 1;
}
static Addr
addr(Biobuf *bp)
{
Addr a;
int t;
long off;
off = 0;
a.gotype = 0;
a.sym = -1;
a.flags = BGETC(bp); /* flags */
if(a.flags & T_INDEX)
skip(bp, 2);
if(a.flags & T_OFFSET){
off = BGETLE4(bp);
if(off < 0)
off = -off;
}
if(a.flags & T_OFFSET2){
Bgetle4(bp);
}
if(a.flags & T_SYM)
a.sym = BGETC(bp);
if(a.flags & T_FCONST)
skip(bp, 8);
else
if(a.flags & T_SCONST)
skip(bp, NSNAME);
if(a.flags & T_TYPE) {
t = BGETC(bp);
if(a.sym > 0 && (t==D_PARAM || t==D_AUTO))
_offset(a.sym, off);
}
if(a.flags & T_GOTYPE)
a.gotype = BGETC(bp);
return a;
}
static char
type2char(int t)
{
switch(t){
case D_EXTERN: return 'U';
case D_STATIC: return 'b';
case D_AUTO: return 'a';
case D_PARAM: return 'p';
default: return UNKNOWN;
}
}
static void
skip(Biobuf *bp, int n)
{
while (n-- > 0)
Bgetc(bp);
}
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