[mips] Initial framework support for MIPS32

src/vm/tick_sampler_posix.cc

Index: src/vm/tick_sampler_posix.cc
diff --git a/src/vm/tick_sampler_posix.cc b/src/vm/tick_sampler_posix.cc
index 31261480a067bf954a3a6097477d890c0ebcb922..d61bc2e6054ab023839397a7e60d1f0ca1133aed 100644
--- a/src/vm/tick_sampler_posix.cc
+++ b/src/vm/tick_sampler_posix.cc
@@ -56,6 +56,11 @@ static void SignalHandler(int signal, siginfo_t* info, void* context) {
   sample->sp = bit_cast<word>(mcontext.arm_sp);
   sample->fp = bit_cast<word>(mcontext.arm_fp);
   ip = bit_cast<word>(mcontext.arm_r5);
+#elif defined(DARTINO_TARGET_MIPS)
+  sample->pc = (word)mcontext.pc;
+  sample->sp = (word)mcontext.gregs[29];
+  sample->fp = (word)mcontext.gregs[30];
+  ip = (word)mcontext.gregs[17];
 #else
   FATAL("HandleSignal not support on this platform");
 #endif