ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: /libinterp/load.c/
#include "lib9.h"
#include "isa.h"
#include "interp.h"
#include "raise.h"
#include <kernel.h>
#define A(r) *((Array**)(r))
Module* modules;
int dontcompile;
static int
operand(uchar **p)
{
int c;
uchar *cp;
cp = *p;
c = cp[0];
switch(c & 0xC0) {
case 0x00:
*p = cp+1;
return c;
case 0x40:
*p = cp+1;
return c|~0x7F;
case 0x80:
*p = cp+2;
if(c & 0x20)
c |= ~0x3F;
else
c &= 0x3F;
return (c<<8)|cp[1];
case 0xC0:
*p = cp+4;
if(c & 0x20)
c |= ~0x3F;
else
c &= 0x3F;
return (c<<24)|(cp[1]<<16)|(cp[2]<<8)|cp[3];
}
return 0;
}
static ulong
disw(uchar **p)
{
ulong v;
uchar *c;
c = *p;
v = c[0] << 24;
v |= c[1] << 16;
v |= c[2] << 8;
v |= c[3];
*p = c + 4;
return v;
}
double
canontod(ulong v[2])
{
union { double d; unsigned long ul[2]; } a;
a.d = 1.;
if(a.ul[0]) {
a.ul[0] = v[0];
a.ul[1] = v[1];
}
else {
a.ul[1] = v[0];
a.ul[0] = v[1];
}
return a.d;
}
Module*
load(char *path)
{
return readmod(path, nil, 0);
}
int
brpatch(Inst *ip, Module *m)
{
switch(ip->op) {
case ICALL:
case IJMP:
case IBEQW:
case IBNEW:
case IBLTW:
case IBLEW:
case IBGTW:
case IBGEW:
case IBEQB:
case IBNEB:
case IBLTB:
case IBLEB:
case IBGTB:
case IBGEB:
case IBEQF:
case IBNEF:
case IBLTF:
case IBLEF:
case IBGTF:
case IBGEF:
case IBEQC:
case IBNEC:
case IBLTC:
case IBLEC:
case IBGTC:
case IBGEC:
case IBEQL:
case IBNEL:
case IBLTL:
case IBLEL:
case IBGTL:
case IBGEL:
case ISPAWN:
if(ip->d.imm < 0 || ip->d.imm >= m->nprog)
return 0;
ip->d.imm = (WORD)&m->prog[ip->d.imm];
break;
}
return 1;
}
Module*
parsemod(char *path, uchar *code, ulong length, Dir *dir)
{
Heap *h;
Inst *ip;
Type *pt;
String *s;
Module *m;
Array *ary;
ulong ul[2];
WORD lo, hi;
int lsize, id, v, entry, entryt, tnp, tsz, siglen;
int de, pc, i, n, isize, dsize, hsize, dasp;
uchar *mod, sm, *istream, **isp, *si, *addr, *dastack[DADEPTH];
Link *l;
istream = code;
isp = &istream;
m = malloc(sizeof(Module));
if(m == nil)
return nil;
m->dev = dir->dev;
m->dtype = dir->type;
m->qid = dir->qid;
m->mtime = dir->mtime;
m->origmp = H;
m->pctab = nil;
switch(operand(isp)) {
default:
kwerrstr("bad magic");
goto bad;
case SMAGIC:
siglen = operand(isp);
n = length-(*isp-code);
if(n < 0 || siglen > n){
kwerrstr("corrupt signature");
goto bad;
}
if(verifysigner(*isp, siglen, *isp+siglen, n-siglen) == 0) {
kwerrstr("security violation");
goto bad;
}
*isp += siglen;
break;
case XMAGIC:
if(mustbesigned(path, code, length, dir)){
kwerrstr("security violation: not signed");
goto bad;
}
break;
}
m->rt = operand(isp);
m->ss = operand(isp);
isize = operand(isp);
dsize = operand(isp);
hsize = operand(isp);
lsize = operand(isp);
entry = operand(isp);
entryt = operand(isp);
if(isize < 0 || dsize < 0 || hsize < 0 || lsize < 0) {
kwerrstr("implausible Dis file");
goto bad;
}
m->nprog = isize;
m->prog = mallocz(isize*sizeof(Inst), 0);
if(m->prog == nil) {
kwerrstr(exNomem);
goto bad;
}
m->ref = 1;
ip = m->prog;
for(i = 0; i < isize; i++) {
ip->op = *istream++;
ip->add = *istream++;
ip->reg = 0;
ip->s.imm = 0;
ip->d.imm = 0;
switch(ip->add & ARM) {
case AXIMM:
case AXINF:
case AXINM:
ip->reg = operand(isp);
break;
}
switch(UXSRC(ip->add)) {
case SRC(AFP):
case SRC(AMP):
case SRC(AIMM):
ip->s.ind = operand(isp);
break;
case SRC(AIND|AFP):
case SRC(AIND|AMP):
ip->s.i.f = operand(isp);
ip->s.i.s = operand(isp);
break;
}
switch(UXDST(ip->add)) {
case DST(AFP):
case DST(AMP):
ip->d.ind = operand(isp);
break;
case DST(AIMM):
ip->d.ind = operand(isp);
if(brpatch(ip, m) == 0) {
kwerrstr("bad branch addr");
goto bad;
}
break;
case DST(AIND|AFP):
case DST(AIND|AMP):
ip->d.i.f = operand(isp);
ip->d.i.s = operand(isp);
break;
}
ip++;
}
m->ntype = hsize;
m->type = malloc(hsize*sizeof(Type*));
if(m->type == nil) {
kwerrstr(exNomem);
goto bad;
}
for(i = 0; i < hsize; i++) {
id = operand(isp);
if(id > hsize) {
kwerrstr("heap id range");
goto bad;
}
tsz = operand(isp);
tnp = operand(isp);
if(tsz < 0 || tnp < 0 || tnp > 128*1024){
kwerrstr("implausible Dis file");
goto bad;
}
pt = dtype(freeheap, tsz, istream, tnp);
if(pt == nil) {
kwerrstr(exNomem);
goto bad;
}
istream += tnp;
m->type[id] = pt;
}
if(dsize != 0) {
pt = m->type[0];
if(pt == 0 || pt->size != dsize) {
kwerrstr("bad desc for mp");
goto bad;
}
h = heapz(pt);
m->origmp = H2D(uchar*, h);
}
addr = m->origmp;
dasp = 0;
for(;;) {
sm = *istream++;
if(sm == 0)
break;
n = DLEN(sm);
if(n == 0)
n = operand(isp);
v = operand(isp);
si = addr + v;
switch(DTYPE(sm)) {
default:
kwerrstr("bad data item");
goto bad;
case DEFS:
s = c2string((char*)istream, n);
istream += n;
*(String**)si = s;
break;
case DEFB:
for(i = 0; i < n; i++)
*si++ = *istream++;
break;
case DEFW:
for(i = 0; i < n; i++) {
*(WORD*)si = disw(isp);
si += sizeof(WORD);
}
break;
case DEFL:
for(i = 0; i < n; i++) {
hi = disw(isp);
lo = disw(isp);
*(LONG*)si = (LONG)hi << 32 | (LONG)(ulong)lo;
si += sizeof(LONG);
}
break;
case DEFF:
for(i = 0; i < n; i++) {
ul[0] = disw(isp);
ul[1] = disw(isp);
*(REAL*)si = canontod(ul);
si += sizeof(REAL);
}
break;
case DEFA: /* Array */
v = disw(isp);
if(v < 0 || v > m->ntype) {
kwerrstr("bad array type");
goto bad;
}
pt = m->type[v];
v = disw(isp);
h = nheap(sizeof(Array)+(pt->size*v));
h->t = &Tarray;
h->t->ref++;
ary = H2D(Array*, h);
ary->t = pt;
ary->len = v;
ary->root = H;
ary->data = (uchar*)ary+sizeof(Array);
memset((void*)ary->data, 0, pt->size*v);
initarray(pt, ary);
A(si) = ary;
break;
case DIND: /* Set index */
ary = A(si);
if(ary == H || D2H(ary)->t != &Tarray) {
kwerrstr("ind not array");
goto bad;
}
v = disw(isp);
if(v > ary->len || v < 0 || dasp >= DADEPTH) {
kwerrstr("array init range");
goto bad;
}
dastack[dasp++] = addr;
addr = ary->data+v*ary->t->size;
break;
case DAPOP:
if(dasp == 0) {
kwerrstr("pop range");
goto bad;
}
addr = dastack[--dasp];
break;
}
}
mod = istream;
if(memchr(mod, 0, 128) == 0) {
kwerrstr("bad module name");
goto bad;
}
m->name = strdup((char*)mod);
if(m->name == nil) {
kwerrstr(exNomem);
goto bad;
}
while(*istream++)
;
l = m->ext = (Link*)malloc((lsize+1)*sizeof(Link));
if(l == nil){
kwerrstr(exNomem);
goto bad;
}
for(i = 0; i < lsize; i++, l++) {
pc = operand(isp);
de = operand(isp);
v = disw(isp);
pt = nil;
if(de != -1)
pt = m->type[de];
mlink(m, l, istream, v, pc, pt);
while(*istream++)
;
}
l->name = nil;
if(m->rt & HASLDT0){
kwerrstr("obsolete dis");
goto bad;
}
if(m->rt & HASLDT){
int j, nl;
Import *i1, **i2;
nl = operand(isp);
i2 = m->ldt = (Import**)malloc((nl+1)*sizeof(Import*));
if(i2 == nil){
kwerrstr(exNomem);
goto bad;
}
for(i = 0; i < nl; i++, i2++){
n = operand(isp);
i1 = *i2 = (Import*)malloc((n+1)*sizeof(Import));
if(i1 == nil){
kwerrstr(exNomem);
goto bad;
}
for(j = 0; j < n; j++, i1++){
i1->sig = disw(isp);
i1->name = strdup((char*)istream);
if(i1->name == nil){
kwerrstr(exNomem);
goto bad;
}
while(*istream++)
;
}
}
istream++;
}
if(m->rt & HASEXCEPT){
int j, nh;
Handler *h;
Except *e;
nh = operand(isp);
m->htab = malloc((nh+1)*sizeof(Handler));
if(m->htab == nil){
kwerrstr(exNomem);
goto bad;
}
h = m->htab;
for(i = 0; i < nh; i++, h++){
h->eoff = operand(isp);
h->pc1 = operand(isp);
h->pc2 = operand(isp);
n = operand(isp);
if(n != -1)
h->t = m->type[n];
n = operand(isp);
h->ne = n>>16;
n &= 0xffff;
h->etab = malloc((n+1)*sizeof(Except));
if(h->etab == nil){
kwerrstr(exNomem);
goto bad;
}
e = h->etab;
for(j = 0; j < n; j++, e++){
e->s = strdup((char*)istream);
if(e->s == nil){
kwerrstr(exNomem);
goto bad;
}
while(*istream++)
;
e->pc = operand(isp);
}
e->s = nil;
e->pc = operand(isp);
}
istream++;
}
m->entryt = nil;
m->entry = m->prog;
if((ulong)entry < isize && (ulong)entryt < hsize) {
m->entry = &m->prog[entry];
m->entryt = m->type[entryt];
}
if(cflag) {
if((m->rt&DONTCOMPILE) == 0 && !dontcompile)
compile(m, isize, nil);
}
else
if(m->rt & MUSTCOMPILE && !dontcompile) {
if(compile(m, isize, nil) == 0) {
kwerrstr("compiler required");
goto bad;
}
}
m->path = strdup(path);
if(m->path == nil) {
kwerrstr(exNomem);
goto bad;
}
m->link = modules;
modules = m;
return m;
bad:
destroy(m->origmp);
freemod(m);
return nil;
}
Module*
newmod(char *s)
{
Module *m;
m = malloc(sizeof(Module));
if(m == nil)
error(exNomem);
m->ref = 1;
m->path = s;
m->origmp = H;
m->name = strdup(s);
if(m->name == nil) {
free(m);
error(exNomem);
}
m->link = modules;
modules = m;
m->pctab = nil;
return m;
}
Module*
lookmod(char *s)
{
Module *m;
for(m = modules; m != nil; m = m->link)
if(strcmp(s, m->path) == 0) {
m->ref++;
return m;
}
return nil;
}
void
freemod(Module *m)
{
int i;
Handler *h;
Except *e;
Import *i1, **i2;
if(m->type != nil) {
for(i = 0; i < m->ntype; i++)
freetype(m->type[i]);
free(m->type);
}
free(m->name);
free(m->prog);
free(m->path);
free(m->pctab);
if(m->ldt != nil){
for(i2 = m->ldt; *i2 != nil; i2++){
for(i1 = *i2; i1->name != nil; i1++)
free(i1->name);
free(*i2);
}
free(m->ldt);
}
if(m->htab != nil){
for(h = m->htab; h->etab != nil; h++){
for(e = h->etab; e->s != nil; e++)
free(e->s);
free(h->etab);
}
free(m->htab);
}
free(m);
}
void
unload(Module *m)
{
Module **last, *mm;
m->ref--;
if(m->ref > 0)
return;
if(m->ref == -1)
abort();
last = &modules;
for(mm = modules; mm != nil; mm = mm->link) {
if(mm == m) {
*last = m->link;
break;
}
last = &mm->link;
}
if(m->rt == DYNMOD)
freedyncode(m);
else
destroy(m->origmp);
destroylinks(m);
freemod(m);
}