[MIPS] Add seccomp bpf support

sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc

Index: sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
diff --git a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc b/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
index 2b002b4d235c96481178b56cbf8969cf8045c07e..e954904e31c54175824e4dfd290ed859c22d446d 100644
--- a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
+++ b/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
@@ -33,6 +33,9 @@
 #define MAP_STACK 0x20000  // Daisy build environment has old headers.
 #endif
 
+#if defined(__mips__) && !defined(MAP_STACK)
+#define MAP_STACK 0x40000
+#endif
 namespace {
 
 inline bool RunningOnASAN() {
@@ -59,6 +62,13 @@ inline bool IsArchitectureI386() {
 #endif
 }
 
+inline bool IsArchitectureMips() {
+#if defined(__mips__)
+  return true;
+#else
+  return false;
+#endif
+}
 }  // namespace.
 
 namespace sandbox {
@@ -139,7 +149,7 @@ ErrorCode RestrictFcntlCommands(SandboxBPF* sandbox) {
   // operator.
   // Glibc overrides the kernel's O_LARGEFILE value. Account for this.
   int kOLargeFileFlag = O_LARGEFILE;
-  if (IsArchitectureX86_64() || IsArchitectureI386())
+  if (IsArchitectureX86_64() || IsArchitectureI386() || IsArchitectureMips())
     kOLargeFileFlag = 0100000;
 
   // TODO(jln): add TP_LONG/TP_SIZET types.
@@ -186,7 +196,7 @@ ErrorCode RestrictFcntlCommands(SandboxBPF* sandbox) {
          sandbox->Trap(CrashSIGSYS_Handler, NULL))))))))));
 }
 
-#if defined(__i386__)
+#if defined(__i386__) || defined(__mips__)
 ErrorCode RestrictSocketcallCommand(SandboxBPF* sandbox) {
   // Unfortunately, we are unable to restrict the first parameter to
   // socketpair(2). Whilst initially sounding bad, it's noteworthy that very