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// Inferno libmach/5obj.c
// http://code.google.com/p/inferno-os/source/browse/utils/libmach/5obj.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.
/*
* 5obj.c - identify and parse an arm object file
*/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>
#include "../cmd/5l/5.out.h"
#include "obj.h"
typedef struct Addr Addr;
struct Addr
{
char type;
char sym;
char name;
char gotype;
};
static Addr addr(Biobuf*);
static char type2char(int);
static void skip(Biobuf*, int);
int
_is5(char *s)
{
return s[0] == ANAME /* ANAME */
&& s[1] == D_FILE /* type */
&& s[2] == 1 /* sym */
&& s[3] == '<'; /* name of file */
}
int
_read5(Biobuf *bp, Prog *p)
{
int as, n;
Addr a;
as = BGETC(bp); /* as */
if(as < 0)
return 0;
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;
else if(as == AGLOBL)
p->kind = aData;
skip(bp, 6); /* scond(1), reg(1), lineno(4) */
a = addr(bp);
addr(bp);
if(a.type != D_OREG || a.name != D_STATIC && a.name != D_EXTERN)
p->kind = aNone;
p->sym = a.sym;
return 1;
}
static Addr
addr(Biobuf *bp)
{
Addr a;
long off;
a.type = BGETC(bp); /* a.type */
skip(bp,1); /* reg */
a.sym = BGETC(bp); /* sym index */
a.name = BGETC(bp); /* sym type */
a.gotype = BGETC(bp); /* go type */
switch(a.type){
default:
case D_NONE:
case D_REG:
case D_FREG:
case D_PSR:
case D_FPCR:
break;
case D_REGREG:
case D_REGREG2:
BGETC(bp);
break;
case D_CONST2:
Bgetle4(bp); // fall through
case D_OREG:
case D_CONST:
case D_BRANCH:
case D_SHIFT:
off = BGETLE4(bp);
if(off < 0)
off = -off;
if(a.sym && (a.name==D_PARAM || a.name==D_AUTO))
_offset(a.sym, off);
break;
case D_SCONST:
skip(bp, NSNAME);
break;
case D_FCONST:
skip(bp, 8);
break;
}
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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