/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */  /* * init routines */#include "defs.h"#include "fns.h" char	*symfil;char	*corfil; Map	*symmap;Map	*cormap;Map	*dotmap; int fsym, fcor;static Fhdr fhdr; static int getfile(char*, int, int); voidsetsym(void){	Symbol s; 	if((fsym = getfile(symfil, 1, wtflag)) < 0) {		symmap = dumbmap(-1);		return;	}	if (crackhdr(fsym, &fhdr)) {		machbytype(fhdr.type);		symmap = loadmap(symmap, fsym, &fhdr);		if (symmap == 0)			symmap = dumbmap(fsym);		if (syminit(fsym, &fhdr) < 0)			dprint("%r\n");		if (mach->sbreg && lookup(0, mach->sbreg, &s))			mach->sb = s.value;	}	else		symmap = dumbmap(fsym);} voidsetcor(void){	int i; 	if (cormap) {		for (i = 0; i < cormap->nsegs; i++)			if (cormap->seg[i].inuse)				close(cormap->seg[i].fd);	} 	fcor = getfile(corfil, 2, ORDWR);	if (fcor <= 0) {		if (cormap)			free(cormap);		cormap = dumbmap(-1);		return;	}	if(pid > 0) {	/* provide addressability to executing process */		cormap = attachproc(pid, kflag, fcor, &fhdr);		if (!cormap)			cormap = dumbmap(-1);	} else {		cormap = newmap(cormap, 2);		if (!cormap)			cormap = dumbmap(-1);		setmap(cormap, fcor, fhdr.txtaddr, fhdr.txtaddr+fhdr.txtsz, fhdr.txtaddr, "text");		setmap(cormap, fcor, fhdr.dataddr, 0xffffffff, fhdr.dataddr, "data");	}	kmsys();	return;} Map *dumbmap(int fd){	Map *dumb; 	extern Mach mi386;	extern Machdata i386mach; 	dumb = newmap(0, 1);	setmap(dumb, fd, 0, 0xffffffff, 0, "data");	if (!mach) 			/* default machine = 386 */		mach = &mi386;	if (!machdata)		machdata = &i386mach;	return dumb;} /* * set up maps for a direct process image (/proc) */ voidcmdmap(Map *map){	int i;	char name[MAXSYM]; 	extern char lastc; 	rdc();	readsym(name);	i = findseg(map, name);	if (i < 0)	/* not found */		error("Invalid map name"); 	if (expr(0)) {		if (strcmp(name, "text") == 0)			textseg(expv, &fhdr);		map->seg[i].b = expv;	} else		error("Invalid base address"); 	if (expr(0))		map->seg[i].e = expv;	else		error("Invalid end address"); 	if (expr(0))		map->seg[i].f = expv; 	else		error("Invalid file offset"); 	if (rdc()=='?' && map == cormap) {		if (fcor)			close(fcor);		fcor=fsym;		corfil=symfil;		cormap = symmap;	} else if (lastc == '/' && map == symmap) {		if (fsym)			close(fsym);		fsym=fcor;		symfil=corfil;		symmap=cormap;	} else		reread();} static intgetfile(char *filnam, int cnt, int omode){	int f; 	if (filnam == 0)		return -1;	if (strcmp(filnam, "-") == 0)		return 0;	f = open(filnam, omode|OCEXEC);	if(f < 0 && omode == ORDWR){		f = open(filnam, OREAD|OCEXEC);		if(f >= 0)			dprint("%s open read-only\n", filnam);	}	if (f < 0 && xargc > cnt)		if (wtflag)			f = create(filnam, 1, 0666);	if (f < 0) {		dprint("cannot open `%s': %r\n", filnam);		return -1;	}	return f;} voidkmsys(void){	int i; 	i = findseg(symmap, "text");	if (i >= 0) {		symmap->seg[i].b = symmap->seg[i].b&~mach->ktmask;		symmap->seg[i].e = ~0;	}	i = findseg(symmap, "data");	if (i >= 0) {		symmap->seg[i].b |= mach->kbase;		symmap->seg[i].e |= mach->kbase;	}} voidattachprocess(void){	char buf[100];	Dir *sym, *mem;	int fd; 	if (!adrflg) {		dprint("used pid$a\n");		return;	}	sym = dirfstat(fsym);	sprint(buf, "/proc/%lud/mem", adrval);	corfil = buf;	setcor();	sprint(buf, "/proc/%lud/text", adrval);	fd = open(buf, OREAD);	mem = nil;	if (sym==nil || fd < 0 || (mem=dirfstat(fd))==nil				|| sym->qid.path != mem->qid.path)		dprint("warning: text images may be inconsistent\n");	free(sym);	free(mem);	if (fd >= 0)		close(fd);}