// Fix up the PTE entry
if (pte[pte_index].present == 0) {
- pte[pte_index].user_page = 1;
- if (region->host_type == SHDW_REGION_ALLOCATED) {
- // Full access
- pte[pte_index].present = 1;
- pte[pte_index].writable = 1;
-
- pte[pte_index].page_base_addr = PAGE_BASE_ADDR(host_addr);
- } else if (region->host_type == SHDW_REGION_WRITE_HOOK) {
- // Only trap writes
- PrintDebug("Faulted in a write hook page\n");
+ if ((region->flags.alloced == 1) &&
+ (region->flags.read == 1)) {
+
+ pte[pte_index].user_page = 1;
+
pte[pte_index].present = 1;
- pte[pte_index].writable = 0;
+
+ if (region->flags.write == 1) {
+ pte[pte_index].writable = 1;
+ } else {
+ pte[pte_index].writable = 0;
+ }
pte[pte_index].page_base_addr = PAGE_BASE_ADDR(host_addr);
- } else if (region->host_type == SHDW_REGION_FULL_HOOK) {
- // trap all accesses
- return v3_handle_mem_hook(info, fault_addr, fault_addr, region, error_code);
} else {
- PrintError("Unknown Region Type...\n");
- return -1;
+ return region->unhandled(info, fault_addr, fault_addr, region, error_code);
}
- }
-
- if ( (region->host_type == SHDW_REGION_WRITE_HOOK) &&
- (error_code.write == 1) ) {
- PrintDebug("Triggering Direct paging Write hook\n");
- return v3_handle_mem_hook(info, fault_addr, fault_addr, region, error_code);
+ } else {
+ // We fix all permissions on the first pass,
+ // so we only get here if its an unhandled exception
+ return region->unhandled(info, fault_addr, fault_addr, region, error_code);
}
-
return 0;
}