| Shih-wei Liao | 31384c5 | 2011-09-06 15:27:45 -0700 | [diff] [blame^] | 1 | // Copyright 2011 Google Inc. All Rights Reserved. |
| 2 | |
| 3 | #include "assembler_arm.h" |
| 4 | #include "jni_internal.h" |
| 5 | #include "object.h" |
| 6 | |
| 7 | #define __ assembler-> |
| 8 | |
| 9 | namespace art { |
| 10 | namespace arm { |
| 11 | |
| 12 | ByteArray* CreateJniStub() { |
| 13 | UniquePtr<ArmAssembler> assembler( static_cast<ArmAssembler*>(Assembler::Create(kArm)) ); |
| 14 | |
| 15 | RegList save = (1 << R0) | (1 << R1) | (1 << R2) | (1 << R3) | (1 << LR); |
| 16 | |
| 17 | // Build frame and save registers. Save 5 registers. |
| 18 | __ PushList(save); |
| 19 | // Ensure 16-byte alignment |
| 20 | __ AddConstant(SP, -12); |
| 21 | |
| 22 | // Pass Thread::Current() in R0 |
| 23 | __ mov(R0, ShifterOperand(R9)); |
| 24 | |
| 25 | // Call FindNativeMethod |
| 26 | __ LoadImmediate(R12, reinterpret_cast<int32_t>(&FindNativeMethod)); |
| 27 | __ blx(R12); |
| 28 | |
| 29 | // Save result of FindNativeMethod in R12 |
| 30 | __ mov(R12, ShifterOperand(R0)); |
| 31 | |
| 32 | // Restore registers (including outgoing arguments) |
| 33 | __ AddConstant(SP, 12); |
| 34 | __ PopList(save); |
| 35 | |
| 36 | __ cmp(R12, ShifterOperand(0)); |
| 37 | |
| 38 | // If R12 != 0 tail call into native code |
| 39 | __ mov(PC, ShifterOperand(R12), NE); |
| 40 | |
| 41 | // Return to caller to handle exception |
| 42 | __ mov(PC, ShifterOperand(LR)); |
| 43 | |
| 44 | assembler->EmitSlowPaths(); |
| 45 | |
| 46 | size_t cs = assembler->CodeSize(); |
| 47 | ByteArray* jni_stub = ByteArray::Alloc(cs); |
| 48 | CHECK(jni_stub != NULL); |
| 49 | MemoryRegion code(jni_stub->GetData(), jni_stub->GetLength()); |
| 50 | assembler->FinalizeInstructions(code); |
| 51 | |
| 52 | return jni_stub; |
| 53 | } |
| 54 | |
| 55 | } // namespace arm |
| 56 | } // namespace art |