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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/src/libmach/8obj.c – Rev 2

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/*
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 * 8obj.c - identify and parse a 386 object file
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 */
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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <mach.h>
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#include "8c/8.out.h"
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#include "obj.h"
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typedef struct Addr	Addr;
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struct Addr
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{
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	char	sym;
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	char	flags;
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};
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static	Addr	addr(Biobuf*);
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static	char	type2char(int);
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static	void	skip(Biobuf*, int);
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int
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_is8(char *t)
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{
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	uchar *s = (uchar*)t;
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	return  s[0] == (ANAME&0xff)			/* aslo = ANAME */
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		&& s[1] == ((ANAME>>8)&0xff)
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		&& s[2] == D_FILE			/* type */
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		&& s[3] == 1				/* sym */
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		&& s[4] == '<';				/* name of file */
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}
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int
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_read8(Biobuf *bp, Prog* p)
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{
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	int as, n, c;
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	Addr a;
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	as = Bgetc(bp);		/* as(low) */
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	if(as < 0)
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		return 0;
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	c = Bgetc(bp);		/* as(high) */
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	if(c < 0)
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		return 0;
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	as |= ((c & 0xff) << 8);
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	p->kind = aNone;
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	p->sig = 0;
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	if(as == ANAME || as == ASIGNAME){
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		if(as == ASIGNAME){
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			Bread(bp, &p->sig, 4);
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			p->sig = leswal(p->sig);
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		}
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		p->kind = aName;
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		p->type = type2char(Bgetc(bp));		/* type */
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		p->sym = Bgetc(bp);			/* sym */
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		n = 0;
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		for(;;) {
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			as = Bgetc(bp);
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			if(as < 0)
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				return 0;
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			n++;
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			if(as == 0)
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				break;
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		}
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		p->id = malloc(n);
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		if(p->id == 0)
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			return 0;
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		Bseek(bp, -n, 1);
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		if(Bread(bp, p->id, n) != n)
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			return 0;
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		return 1;
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	}
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	if(as == ATEXT)
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		p->kind = aText;
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	if(as == AGLOBL)
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		p->kind = aData;
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	skip(bp, 4);		/* lineno(4) */
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	a = addr(bp);
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	addr(bp);
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	if(!(a.flags & T_SYM))
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		p->kind = aNone;
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	p->sym = a.sym;
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	return 1;
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}
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static Addr
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addr(Biobuf *bp)
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{
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	Addr a;
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	int t;
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	long off;
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	off = 0;
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	a.sym = -1;
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	a.flags = Bgetc(bp);			/* flags */
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	if(a.flags & T_INDEX)
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		skip(bp, 2);
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	if(a.flags & T_OFFSET){
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		off = Bgetc(bp);
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		off |= Bgetc(bp) << 8;
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		off |= Bgetc(bp) << 16;
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		off |= Bgetc(bp) << 24;
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		if(off < 0)
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			off = -off;
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	}
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	if(a.flags & T_SYM)
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		a.sym = Bgetc(bp);
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	if(a.flags & T_FCONST)
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		skip(bp, 8);
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	else
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	if(a.flags & T_SCONST)
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		skip(bp, NSNAME);
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	if(a.flags & T_TYPE) {
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		t = Bgetc(bp);
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		if(a.sym > 0 && (t==D_PARAM || t==D_AUTO))
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			_offset(a.sym, off);
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	}
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	return a;
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}
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static char
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type2char(int t)
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{
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	switch(t){
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	case D_EXTERN:		return 'U';
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	case D_STATIC:		return 'b';
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	case D_AUTO:		return 'a';
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	case D_PARAM:		return 'p';
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	default:		return UNKNOWN;
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	}
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}
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static void
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skip(Biobuf *bp, int n)
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{
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	while (n-- > 0)
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		Bgetc(bp);
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}