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/*
* functions to read and write an executable or file image
*/
#include <lib9.h>
#include <bio.h>
#include "mach.h"
static int mget(Map*, ulong, char*, int);
static int mput(Map*, ulong, char*, int);
struct segment* reloc(Map*, ulong, long*);
/*
* routines to get/put various types
*/
int
get8(Map *map, ulong addr, vlong *x)
{
if (!map) {
werrstr("get8: invalid map");
return -1;
}
if (map->nsegs == 1 && map->seg[0].fd < 0) {
*x = (vlong)addr;
return 1;
}
if (mget(map, addr, (char *)x, 8) < 0)
return -1;
*x = machdata->swav(*x);
return (1);
}
int
get4(Map *map, ulong addr, long *x)
{
if (!map) {
werrstr("get4: invalid map");
return -1;
}
if (map->nsegs == 1 && map->seg[0].fd < 0) {
*x = addr;
return 1;
}
if (mget(map, addr, (char *)x, 4) < 0)
return -1;
*x = machdata->swal(*x);
return (1);
}
int
get2(Map *map, ulong addr, ushort *x)
{
if (!map) {
werrstr("get2: invalid map");
return -1;
}
if (map->nsegs == 1 && map->seg[0].fd < 0) {
*x = addr;
return 1;
}
if (mget(map, addr, (char *)x, 2) < 0)
return -1;
*x = machdata->swab(*x);
return (1);
}
int
get1(Map *map, ulong addr, uchar *x, int size)
{
uchar *cp;
if (!map) {
werrstr("get1: invalid map");
return -1;
}
if (map->nsegs == 1 && map->seg[0].fd < 0) {
cp = (uchar*)&addr;
while (cp < (uchar*)(&addr+1) && size-- > 0)
*x++ = *cp++;
while (size-- > 0)
*x++ = 0;
} else
return mget(map, addr, (char*)x, size);
return 1;
}
int
put8(Map *map, ulong addr, vlong v)
{
if (!map) {
werrstr("put8: invalid map");
return -1;
}
v = machdata->swav(v);
return mput(map, addr, (char *)&v, 8);
}
int
put4(Map *map, ulong addr, long v)
{
if (!map) {
werrstr("put4: invalid map");
return -1;
}
v = machdata->swal(v);
return mput(map, addr, (char *)&v, 4);
}
int
put2(Map *map, ulong addr, ushort v)
{
if (!map) {
werrstr("put2: invalid map");
return -1;
}
v = machdata->swab(v);
return mput(map, addr, (char *)&v, 2);
}
int
put1(Map *map, ulong addr, uchar *v, int size)
{
if (!map) {
werrstr("put1: invalid map");
return -1;
}
return mput(map, addr, (char *)v, size);
}
static int
mget(Map *map, ulong addr, char *buf, int size)
{
long off;
int i, j, k;
struct segment *s;
s = reloc(map, addr, &off);
if (!s)
return -1;
if (s->fd < 0) {
werrstr("unreadable map");
return -1;
}
if (s->mget)
return s->mget(s, addr, off, buf, size);
seek(s->fd, off, 0);
for (i = j = 0; i < 2; i++) { /* in case read crosses page */
k = read(s->fd, buf, size-j);
if (k < 0) {
werrstr("can't read address %lux: %r", addr);
return -1;
}
j += k;
if (j == size)
return j;
}
werrstr("partial read at address %lux", addr);
return -1;
}
static int
mput(Map *map, ulong addr, char *buf, int size)
{
long off;
int i, j, k;
struct segment *s;
s = reloc(map, addr, &off);
if (!s)
return -1;
if (s->fd < 0) {
werrstr("unwritable map");
return -1;
}
if (s->mput)
return s->mput(s, addr, off, buf, size);
seek(s->fd, off, 0);
for (i = j = 0; i < 2; i++) { /* in case read crosses page */
k = write(s->fd, buf, size-j);
if (k < 0) {
werrstr("can't write address %lux: %r", addr);
return -1;
}
j += k;
if (j == size)
return j;
}
werrstr("partial write at address %lux", addr);
return -1;
}
/*
* convert address to file offset; returns nonzero if ok
*/
struct segment*
reloc(Map *map, ulong addr, long *offp)
{
int i;
for (i = 0; i < map->nsegs; i++) {
if (map->seg[i].inuse)
if (map->seg[i].b <= addr && addr < map->seg[i].e) {
*offp = addr + map->seg[i].f - map->seg[i].b;
return &map->seg[i];
}
}
werrstr("can't translate address %lux", addr);
return 0;
}
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