/* * file map routines */#include <u.h>#include <libc.h>#include <bio.h>#include <mach.h> static int	reloc(Map *, int, ulong, long *);static int	rreloc(Map *, int, ulong, long *); Map *newmap(Map *map, int fd){	if (map == 0) {		map = malloc(sizeof(Map));		if (map == 0) {			print("out of memory\n");			return 0;		}		map->seg[SEGTEXT].inuse = 0;		map->seg[SEGDATA].inuse = 0;		map->seg[SEGUBLK].inuse = 0;		map->seg[SEGREGS].inuse = 0;		map->seg[SEGTEXT].name = "text";		map->seg[SEGDATA].name = "data";		map->seg[SEGUBLK].name = "ublock";		map->seg[SEGREGS].name = "regs";	}	map->fd = fd;	return map;} intsetmap(Map *map, int s, ulong b, ulong e, ulong f){	if (map == 0 || s == SEGANY)		return 0;	map->seg[s].b = b;	map->seg[s].e = e;	map->seg[s].f = f;	map->seg[s].inuse = 1;	return 1;} voidunusemap(Map *map, int s){	if (map != 0 && s != SEGANY)		map->seg[s].inuse = 0;} Map *loadmap(Map *map, int fd, Fhdr *fp){	map = newmap(map, fd);	if (map == 0)		return 0;	if (mach == 0)		return 0;	map->seg[SEGTEXT].b = fp->txtaddr;	map->seg[SEGTEXT].e = fp->txtaddr+fp->txtsz;	map->seg[SEGTEXT].f = fp->txtoff;	map->seg[SEGTEXT].inuse = 1;	map->seg[SEGDATA].b = fp->dataddr;	map->seg[SEGDATA].e = fp->dataddr+fp->datsz;	map->seg[SEGDATA].f = fp->datoff;	map->seg[SEGDATA].inuse = 1;	map->seg[SEGUBLK].inuse = 0;	map->seg[SEGREGS].inuse = 0;	return map;} intmget(Map *map, int s, ulong addr, char *buf, int size){	long off;	int i, j; 	if (reloc(map, s, addr, &off) == 0)		return -1;	if (seek(map->fd, off, 0) == -1)		return 0;	for (i = j = 0; i < 2; i++) {	/* in case read crosses page */		j += read(map->fd, buf, size-j);		if (j == size)			return 1;	}	return 0;} intmput(Map *map, int s, ulong addr, char *buf, int size){	long off;	int i, j; 	if (reloc(map, s, addr,&off) == 0)		return (-1);	if (seek(map->fd, off, 0) == -1)		return 0;	for (i = j = 0; i < 2; i++) {	/* in case read crosses page */		j += write(map->fd, buf, size-j);		if (j == size)			return 1;	}	return 0;} /* * turn address to file offset * returns nonzero if ok */static intreloc(Map *map, int s, ulong addr, long *offp){	if(map == 0)		return 0; 	switch(s) {	case SEGANY:		if (rreloc(map, SEGTEXT, addr, offp))			return 1;		if (rreloc(map, SEGDATA, addr, offp))			return 1;		if (rreloc(map, SEGUBLK, addr, offp))			return 1;		break;	case SEGDATA:		if (rreloc(map, SEGDATA, addr, offp))			return 1;		if (rreloc(map, SEGUBLK, addr, offp))			return 1;		break;	default:		return rreloc(map, s, addr, offp);	}	return 0;} static intrreloc(Map *map, int s, ulong addr, long *offp){	if (map->seg[s].inuse) {		if (map->seg[s].b <= addr && addr < map->seg[s].e) {			*offp = addr + map->seg[s].f - map->seg[s].b;			return 1;		}	}	return 0;}