Support for SetVReg and add SetGPR.
These changes are useful for debugging and are required for being able
to change all GC roots.
MIPS is untested.
Change-Id: I2ba055de64264098bffe869a4fb192d0975f1c8f
diff --git a/src/oat/runtime/mips/context_mips.cc b/src/oat/runtime/mips/context_mips.cc
index dc13c63..0c2f915 100644
--- a/src/oat/runtime/mips/context_mips.cc
+++ b/src/oat/runtime/mips/context_mips.cc
@@ -21,16 +21,20 @@
namespace art {
namespace mips {
-MipsContext::MipsContext() {
-#ifndef NDEBUG
+static const uint32_t gZero = 0;
+
+void MipsContext::Reset() {
+ for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
+ gprs_[i] = NULL;
+ }
+ for (size_t i = 0; i < kNumberOfFRegisters; i++) {
+ fprs_[i] = NULL;
+ }
+ gprs_[SP] = &sp_;
+ gprs_[RA] = &ra_;
// Initialize registers with easy to spot debug values.
- for (int i = 0; i < 32; i++) {
- gprs_[i] = kBadGprBase + i;
- }
- for (int i = 0; i < 32; i++) {
- fprs_[i] = kBadGprBase + i;
- }
-#endif
+ sp_ = MipsContext::kBadGprBase + SP;
+ ra_ = MipsContext::kBadGprBase + RA;
}
void MipsContext::FillCalleeSaves(const StackVisitor& fr) {
@@ -41,39 +45,55 @@
size_t fp_spill_count = __builtin_popcount(fp_core_spills);
size_t frame_size = method->GetFrameSizeInBytes();
if (spill_count > 0) {
- // Lowest number spill is furthest away, walk registers and fill into context.
+ // Lowest number spill is farthest away, walk registers and fill into context.
int j = 1;
- for (int i = 0; i < 32; i++) {
+ for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
if (((core_spills >> i) & 1) != 0) {
- gprs_[i] = fr.LoadCalleeSave(spill_count - j, frame_size);
+ gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_size);
j++;
}
}
}
if (fp_spill_count > 0) {
- // Lowest number spill is furthest away, walk registers and fill into context.
+ // Lowest number spill is farthest away, walk registers and fill into context.
int j = 1;
- for (int i = 0; i < 32; i++) {
+ for (size_t i = 0; i < kNumberOfFRegisters; i++) {
if (((fp_core_spills >> i) & 1) != 0) {
- fprs_[i] = fr.LoadCalleeSave(spill_count + fp_spill_count - j, frame_size);
+ fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j, frame_size);
j++;
}
}
}
}
+void MipsContext::SetGPR(uint32_t reg, uintptr_t value) {
+ CHECK_LT(reg, kNumberOfCoreRegisters);
+ CHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
+ CHECK(gprs_[reg] != NULL);
+ *gprs_[reg] = value;
+}
+
void MipsContext::SmashCallerSaves() {
- gprs_[V0] = 0; // This needs to be 0 because we want a null/zero return value.
- gprs_[V1] = 0; // This needs to be 0 because we want a null/zero return value.
- gprs_[A1] = kBadGprBase + A1;
- gprs_[A2] = kBadGprBase + A2;
- gprs_[A3] = kBadGprBase + A3;
+ // This needs to be 0 because we want a null/zero return value.
+ gprs_[V0] = const_cast<uint32_t*>(&gZero);
+ gprs_[V1] = const_cast<uint32_t*>(&gZero);
+ gprs_[A1] = NULL;
+ gprs_[A2] = NULL;
+ gprs_[A3] = NULL;
}
extern "C" void art_do_long_jump(uint32_t*, uint32_t*);
void MipsContext::DoLongJump() {
- art_do_long_jump(&gprs_[ZERO], &fprs_[F0]);
+ uintptr_t gprs[kNumberOfCoreRegisters];
+ uint32_t fprs[kNumberOfFRegisters];
+ for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) {
+ gprs[i] = gprs_[i] != NULL ? *gprs_[i] : MipsContext::kBadGprBase + i;
+ }
+ for (size_t i = 0; i < kNumberOfFRegisters; ++i) {
+ fprs[i] = fprs_[i] != NULL ? *fprs_[i] : MipsContext::kBadGprBase + i;
+ }
+ art_do_long_jump(gprs, fprs);
}
} // namespace mips