[MIPS] Add remaining parts for building tests for MIPS

tests/exception_test/exception_test.c

Index: tests/exception_test/exception_test.c
diff --git a/tests/exception_test/exception_test.c b/tests/exception_test/exception_test.c
index 76724a9245c2401bf4aa330ce1f6e4923a28d0f4..a44e2db25c223fe3ccf0e763f76037bb1ea495e6 100644
--- a/tests/exception_test/exception_test.c
+++ b/tests/exception_test/exception_test.c
@@ -31,7 +31,11 @@ char *g_registered_stack;
 size_t g_registered_stack_size;
 
 
+#if defined(__mips__)
+#define STACK_ALIGNMENT 8
+#else
 #define STACK_ALIGNMENT 16
+#endif
 
 #if defined(__i386__)
 const int kReturnAddrSize = 4;
@@ -45,6 +49,10 @@ const int kRedZoneSize = 128;
 const int kReturnAddrSize = 0;
 const int kArgSizeOnStack = 0;
 const int kRedZoneSize = 0;
+#elif defined(__mips__)
+const int kReturnAddrSize = 0;
+const int kArgSizeOnStack = 16;
+const int kRedZoneSize = 0;
 #else
 # error Unsupported architecture
 #endif
@@ -63,7 +71,11 @@ struct AlignedType {
  */
 __attribute__((noinline))
 void check_pointer_is_aligned(void *pointer) {
+#if defined(__mips__)
+  assert((uintptr_t) pointer % 8 == 0);
+#else
   assert((uintptr_t) pointer % 16 == 0);
+#endif
 }
 
 void check_stack_is_aligned(void) {
@@ -97,6 +109,15 @@ __asm__(".pushsection .text, \"ax\", %progbits\n"
         "prog_ctr_at_crash:\n"
         "str r0, [r0]\n"
         ".popsection\n");
+#elif defined(__mips__)
+__asm__(".pushsection .text, \"ax\", %progbits\n"
+        ".p2align 4\n"
+        "crash_at_known_address:\n"
+        "ori $t0, $zero, 0\n"
+        "and $t0, $t0, $t7\n"
+        "prog_ctr_at_crash:\n"
+        "sw $t0, 0($t0)\n"
+        ".popsection\n");
 #else
 # error Unsupported architecture
 #endif
@@ -121,6 +142,8 @@ void exception_handler_wrapped(struct NaClSignalContext *entry_regs) {
   assert(context->frame_ptr == (uint32_t) g_regs_at_crash.rbp);
 #elif defined(__arm__)
   assert(context->frame_ptr == g_regs_at_crash.r11);
+#elif defined(__mips__)
+  assert(context->frame_ptr == g_regs_at_crash.frame_ptr);
 #else
 # error Unsupported architecture
 #endif
@@ -194,6 +217,9 @@ void test_exception_stack_with_size(char *stack, size_t stack_size) {
 #if defined(__arm__)
   /* crash_at_known_address clobbers r0. */
   g_regs_at_crash.r0 = 0;
+#elif defined(__mips__)
+  /* crash_at_known_address clobbers t0. */
+  g_regs_at_crash.t0 = 0;
 #endif
 
   if (!setjmp(g_jmp_buf)) {