int32_t NaClSysExceptionStack(struct NaClAppThread *natp,
uint32_t stack_addr,
uint32_t stack_size) {
if (!natp->nap->enable_exception_handling) {
return -NACL_ABI_ENOSYS;
}
if (kNaClBadAddress == NaClUserToSysAddrNullOkay(natp->nap,
stack_addr + stack_size)) {
return -NACL_ABI_EINVAL;
}
natp->exception_stack = stack_addr + stack_size;
return 0;
}
/*
* check "prot" access for user area (start, size)
* if failed return -1, otherwise - 0
*/
static int CheckRAMAccess(struct NaClApp *nap, uintptr_t start, int64_t size, int prot)
{
int i;
start = NaClUserToSysAddrNullOkay(nap, start);
for(i = LeftBumperIdx; i < MemMapSize; ++i)
{
/* skip until start hit block in mem_map */
if(start >= nap->mem_map[i].end) continue;
/* fail if block protection doesn't meat prot */
if((prot & nap->mem_map[i].prot) == 0) return -1;
/* subtract checked space from given area */
size -= (nap->mem_map[i].end - start);
if(size <= 0) return 0;
start = nap->mem_map[i].end;
}
return -1;
}
