xref: /plan9-contrib/sys/src/libmach/map.c (revision 219b2ee8daee37f4aad58d63f21287faa8e4ffdc)

/*
 * file map routines
 */
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>

static int	reloc(Map*, ulong, long*);

Map *
newmap(Map *map, int fd, int n)
{
	int size;

	size = sizeof(Map)+(n-1)*sizeof(struct segment);
	if (map == 0)
		map = malloc(size);
	else
		map = realloc(map, size);
	if (map == 0) {
		werrstr("out of memory: %r");
		return 0;
	}
	memset(map, 0, size);
	map->fd = fd;
	map->nsegs = n;
	return map;
}

int
setmap(Map *map, ulong b, ulong e, ulong f, char *name)
{
	int i;

	if (map == 0)
		return 0;
	for (i = 0; i < map->nsegs; i++)
		if (!map->seg[i].inuse)
			break;
	if (i >= map->nsegs)
		return 0;
	map->seg[i].b = b;
	map->seg[i].e = e;
	map->seg[i].f = f;
	map->seg[i].inuse = 1;
	map->seg[i].name = name;
	return 1;
}

int
findseg(Map *map, char *name)
{
	int i;

	if (!map)
		return -1;
	for (i = 0; i < map->nsegs; i++)
		if (map->seg[i].inuse && !strcmp(map->seg[i].name, name))
			return i;
	return -1;
}

void
unusemap(Map *map, int i)
{
	if (map != 0 && 0 <= i && i < map->nsegs)
		map->seg[i].inuse = 0;
}

Map *
loadmap(Map *map, int fd, Fhdr *fp)
{
	map = newmap(map, fd, 2);
	if (map == 0)
		return 0;
	map->seg[0].b = fp->txtaddr;
	map->seg[0].e = fp->txtaddr+fp->txtsz;
	map->seg[0].f = fp->txtoff;
	map->seg[0].inuse = 1;
	map->seg[0].name = "text";
	map->seg[1].b = fp->dataddr;
	map->seg[1].e = fp->dataddr+fp->datsz;
	map->seg[1].f = fp->datoff;
	map->seg[1].inuse = 1;
	map->seg[1].name = "data";
	return map;
}