Intial Thumb2 Sandbox (naclrev 6680)

src/trusted/validator_arm/ncval.cc

Index: src/trusted/validator_arm/ncval.cc
diff --git a/src/trusted/validator_arm/ncval.cc b/src/trusted/validator_arm/ncval.cc
index cdf2f8dc6e8582bae6639ec312b5d12abaa31b70..e0ca056c59229d15bdaa13ebdbb9273768e2d0ee 100644
--- a/src/trusted/validator_arm/ncval.cc
+++ b/src/trusted/validator_arm/ncval.cc
@@ -51,18 +51,23 @@ class CommandLineProblemSink : public nacl_arm_val::ProblemSink {
 
 const uint32_t kOneGig = 1U * 1024 * 1024 * 1024;
 
-int validate(const ncfile *ncf, bool use_zero_masks) {
+int validate(const ncfile *ncf, bool use_zero_masks, bool thumb) {
+  nacl_arm_dec::RegisterList roRegs = nacl_arm_dec::Register(9);
+  if (thumb) {
+     roRegs = nacl_arm_dec::kRegisterListNothing;
+  }
   SfiValidator validator(
       16,  // bytes per bundle
       // TODO(cbiffle): maybe check region sizes from ELF headers?
       //                verify that instructions are in right region
       kOneGig,  // code region size
       kOneGig,  // data region size
-      nacl_arm_dec::Register(9),  // read only register (used for threading)
-      nacl_arm_dec::Register(13));  // stack pointer
+      roRegs,  // read only register (used for threading)
+      nacl_arm_dec::Register(13),  // stack pointer
+      thumb);
 
   if (use_zero_masks) {
-    validator.change_masks(0, 0);
+    validator.change_masks(0, 0, 0);
   }
 
   CommandLineProblemSink sink;
@@ -74,7 +79,6 @@ int validate(const ncfile *ncf, bool use_zero_masks) {
     if ((shdr[i].sh_flags & SHF_EXECINSTR) != SHF_EXECINSTR) {
       continue;
     }
-
     CodeSegment segment(ncf->data + (shdr[i].sh_addr - ncf->vbase),
         shdr[i].sh_addr, shdr[i].sh_size);
     segments.push_back(segment);
@@ -117,8 +121,8 @@ int main(int argc, const char *argv[]) {
   }
 
   // TODO(cbiffle): check OS ABI, ABI version, align mask
+  int exit_code = validate(ncf, use_zero_masks, ncf->eheader->e_entry & 1);
 
-  int exit_code = validate(ncf, use_zero_masks);
   nc_freefile(ncf);
   return exit_code;
 }