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WebSVN – planix.SVN – Blame – /os/branches/feature-vt/sys/src/libmach/qobj.c – Rev 2

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/*
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 * qobj.c - identify and parse a PowerPC object file
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 *	forsyth@terzarima.net
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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 "qc/q.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	type;
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	char	sym;
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	char	name;
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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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_isq(char *s)
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{
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	return  (s[0]&0377) == ANAME			/* ANAME */
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		&& (s[1]&0377) == ANAME>>8
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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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_readq(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 = beswal(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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	else if(as == AGLOBL)
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		p->kind = aData;
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	n = Bgetc(bp);	/* reg and flag */
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	skip(bp, 4);		/* lineno(4) */
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	a = addr(bp);
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	if(n & 0x40)
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		addr(bp);
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	addr(bp);
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	if(a.type != D_OREG || a.name != D_STATIC && a.name != D_EXTERN)
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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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	long off;
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	a.type = Bgetc(bp);	/* a.type */
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	skip(bp,1);		/* reg */
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	a.sym = Bgetc(bp);	/* sym index */
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	a.name = Bgetc(bp);	/* sym type */
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	switch(a.type){
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	default:
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	case D_NONE: case D_REG: case D_FREG: case D_CREG:
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	case D_FPSCR: case D_MSR: case D_SREG:
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		break;
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	case D_SPR:
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	case D_OREG:
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	case D_DCR:
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	case D_CONST:
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	case D_BRANCH:
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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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		if(a.sym && (a.name==D_PARAM || a.name==D_AUTO))
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			_offset(a.sym, off);
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		break;
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	case D_SCONST:
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		skip(bp, NSNAME);
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		break;
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	case D_FCONST:
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		skip(bp, 8);
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		break;
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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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}