int rp_share(uint64_t rp, void *buf, size_t size, uint64_t offset, int prot) {
struct msg *msg;
int err;
/* check alignment */
if ((uintptr_t) buf % PAGESZ) {
return 1;
}
msg = aalloc(PAGESZ + size, PAGESZ);
if (!msg) return 1;
msg->source = RP_CURRENT_THREAD;
msg->target = rp;
msg->length = PAGESZ - sizeof(struct msg) + size;
msg->port = PORT_SHARE;
msg->arch = ARCH_NAT;
((uint64_t*) msg->data)[0] = offset;
page_self(buf, &msg->data[PAGESZ - sizeof(struct msg)], size);
page_prot(&msg->data[PAGESZ - sizeof(struct msg)], size, prot);
if (msend(msg)) return 1;
msg = mwait(PORT_REPLY, rp);
if (msg->length != 1) {
err = 1;
}
else {
err = msg->data[0];
}
free(msg);
return err;
}
int _exec(void *image, size_t size, int flags) {
struct slt32_header *slt_hdr;
struct slt32_entry *slt;
struct elf32_ehdr *exec;
struct elf_cache cache;
void *entry;
size_t i;
const char *soname;
char imgname[28];
/* check executable */
if (elf_check(image)) {
return 1;
}
/*** POINT OF MAYBE RETURNING IF YOU, y'know, have to... ***/
/* copy executable high */
exec = (void*) sltalloc("dl.img:exec", size);
if ((uintptr_t) image % PAGESZ) {
/* not aligned, copy */
page_anon(exec, size, PROT_READ | PROT_WRITE);
memcpy(exec, image, size);
}
else {
/* aligned, use paging */
page_self(image, exec, size);
}
/*** POINT OF NO RETURN ***/
/* load dependencies */
for (i = 0;; i++) {
soname = _dep(exec, i, 0);
if (!soname) break;
strlcpy(imgname, "dl.img:", 28);
strlcat(imgname, soname, 28);
slt = sltget_name(imgname);
if (!slt) continue;
_load((void*) slt->base, slt->size, RTLD_LAZY | RTLD_GLOBAL | RTLD_OVERWRITE);
sltfree_name(imgname);
}
/* clear lower memory */
slt = (void*) SLT_BASE;
slt_hdr = (void*) SLT_BASE;
for (i = slt_hdr->first; i; i = slt[i].next) {
if (slt[i].flags & SLT_FLAG_CLEANUP) {
page_free((void*) slt[i].base, slt[i].size);
}
}
/* load executable */
elf_load(exec, 0);
exec = (void*) 0x100000;
entry = (void*) exec->e_entry;
elf_gencache(&cache, exec, 1);
elfc_relocate_all(&cache);
/* remove executable image */
sltfree_name("dl.img:exec");
/* reset event handler */
_when(0);
/* enter executable */
dl_enter(entry);
return 1;
}
