From befbd5731ecca08f08780ee28a913d08ffb14656 Mon Sep 17 00:00:00 2001
From: Ian Rogers <irogers@google.com>
Date: Thu, 6 Mar 2014 01:13:39 -0800
Subject: Fix host architecture for 64bit.

Also, hack x86 assembler for use as a x86-64 trampoline compiler's assembler.
Implement missing x86-64 quick resolution trampoline.
Add x86-64 to the quick elf writer.

Change-Id: I08216c67014a83492ada12898ab8000218ba7bb4
---
 compiler/trampolines/trampoline_compiler.cc | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'compiler/trampolines/trampoline_compiler.cc')

diff --git a/compiler/trampolines/trampoline_compiler.cc b/compiler/trampolines/trampoline_compiler.cc
index 32ae5583ac..3e13e44397 100644
--- a/compiler/trampolines/trampoline_compiler.cc
+++ b/compiler/trampolines/trampoline_compiler.cc
@@ -100,6 +100,23 @@ static const std::vector<uint8_t>* CreateTrampoline(ThreadOffset offset) {
 }
 }  // namespace x86
 
+namespace x86_64 {
+static const std::vector<uint8_t>* CreateTrampoline(ThreadOffset offset) {
+  UniquePtr<x86::X86Assembler> assembler(static_cast<x86::X86Assembler*>(Assembler::Create(kX86_64)));
+
+  // All x86 trampolines call via the Thread* held in gs.
+  __ gs()->jmp(x86::Address::Absolute(offset, true));
+  __ int3();
+
+  size_t cs = assembler->CodeSize();
+  UniquePtr<std::vector<uint8_t> > entry_stub(new std::vector<uint8_t>(cs));
+  MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
+  assembler->FinalizeInstructions(code);
+
+  return entry_stub.release();
+}
+}  // namespace x86_64
+
 const std::vector<uint8_t>* CreateTrampoline(InstructionSet isa, EntryPointCallingConvention abi,
                                              ThreadOffset offset) {
   switch (isa) {
@@ -110,6 +127,8 @@ const std::vector<uint8_t>* CreateTrampoline(InstructionSet isa, EntryPointCalli
       return mips::CreateTrampoline(abi, offset);
     case kX86:
       return x86::CreateTrampoline(offset);
+    case kX86_64:
+      return x86_64::CreateTrampoline(offset);
     default:
       LOG(FATAL) << "Unknown InstructionSet: " << isa;
       return NULL;
-- 
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