1 files changed, 111 insertions, 0 deletions
diff --git a/js/src/jit/mips-shared/SharedICHelpers-mips-shared-inl.h b/js/src/jit/mips-shared/SharedICHelpers-mips-shared-inl.h
new file mode 100644
index 0000000000..5e76cef38d
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+++ b/js/src/jit/mips-shared/SharedICHelpers-mips-shared-inl.h
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_mips_shared_SharedICHelpers_mips_shared_inl_h
+#define jit_mips_shared_SharedICHelpers_mips_shared_inl_h
+
+#include "jit/BaselineFrame.h"
+#include "jit/SharedICHelpers.h"
+
+#include "jit/MacroAssembler-inl.h"
+
+namespace js {
+namespace jit {
+
+inline void EmitBaselineTailCallVM(TrampolinePtr target, MacroAssembler& masm,
+                                   uint32_t argSize) {
+  Register scratch = R2.scratchReg();
+
+  // Compute frame size.
+  masm.movePtr(BaselineFrameReg, scratch);
+  masm.addPtr(Imm32(BaselineFrame::FramePointerOffset), scratch);
+  masm.subPtr(BaselineStackReg, scratch);
+
+#ifdef DEBUG
+  // Store frame size without VMFunction arguments for debug assertions.
+  masm.subPtr(Imm32(argSize), scratch);
+  Address frameSizeAddr(BaselineFrameReg,
+                        BaselineFrame::reverseOffsetOfDebugFrameSize());
+  masm.store32(scratch, frameSizeAddr);
+  masm.addPtr(Imm32(argSize), scratch);
+#endif
+
+  // Push frame descriptor and perform the tail call.
+  // ICTailCallReg (ra) already contains the return address (as we
+  // keep it there through the stub calls), but the VMWrapper code being
+  // called expects the return address to also be pushed on the stack.
+  MOZ_ASSERT(ICTailCallReg == ra);
+  masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
+                           ExitFrameLayout::Size());
+  masm.subPtr(Imm32(sizeof(CommonFrameLayout)), StackPointer);
+  masm.storePtr(scratch,
+                Address(StackPointer, CommonFrameLayout::offsetOfDescriptor()));
+  masm.storePtr(
+      ra, Address(StackPointer, CommonFrameLayout::offsetOfReturnAddress()));
+
+  masm.jump(target);
+}
+
+inline void EmitBaselineCreateStubFrameDescriptor(MacroAssembler& masm,
+                                                  Register reg,
+                                                  uint32_t headerSize) {
+  // Compute stub frame size. We have to add two pointers: the stub reg and
+  // previous frame pointer pushed by EmitEnterStubFrame.
+  masm.movePtr(BaselineFrameReg, reg);
+  masm.addPtr(Imm32(sizeof(intptr_t) * 2), reg);
+  masm.subPtr(BaselineStackReg, reg);
+
+  masm.makeFrameDescriptor(reg, FrameType::BaselineStub, headerSize);
+}
+
+inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
+  Register scratch = R2.scratchReg();
+  EmitBaselineCreateStubFrameDescriptor(masm, scratch, ExitFrameLayout::Size());
+  masm.push(scratch);
+  masm.call(target);
+}
+
+inline void EmitBaselineEnterStubFrame(MacroAssembler& masm, Register scratch) {
+  MOZ_ASSERT(scratch != ICTailCallReg);
+
+  // Compute frame size.
+  masm.movePtr(BaselineFrameReg, scratch);
+  masm.addPtr(Imm32(BaselineFrame::FramePointerOffset), scratch);
+  masm.subPtr(BaselineStackReg, scratch);
+
+#ifdef DEBUG
+  Address frameSizeAddr(BaselineFrameReg,
+                        BaselineFrame::reverseOffsetOfDebugFrameSize());
+  masm.store32(scratch, frameSizeAddr);
+#endif
+
+  // Note: when making changes here, don't forget to update
+  // BaselineStubFrame if needed.
+
+  // Push frame descriptor and return address.
+  masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
+                           BaselineStubFrameLayout::Size());
+  masm.subPtr(Imm32(STUB_FRAME_SIZE), StackPointer);
+  masm.storePtr(scratch,
+                Address(StackPointer, offsetof(BaselineStubFrame, descriptor)));
+  masm.storePtr(ICTailCallReg, Address(StackPointer, offsetof(BaselineStubFrame,
+                                                              returnAddress)));
+
+  // Save old frame pointer, stack pointer and stub reg.
+  masm.storePtr(ICStubReg,
+                Address(StackPointer, offsetof(BaselineStubFrame, savedStub)));
+  masm.storePtr(BaselineFrameReg,
+                Address(StackPointer, offsetof(BaselineStubFrame, savedFrame)));
+  masm.movePtr(BaselineStackReg, BaselineFrameReg);
+
+  // Stack should remain aligned.
+  masm.assertStackAlignment(sizeof(Value), 0);
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_mips_shared_SharedICHelpers_mips_shared_inl_h */