1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16/*
17 * Interpreter entry point.
18 */
19
20    .text
21    .align 2
22    .global ExecuteMterpImpl
23    .ent    ExecuteMterpImpl
24    .frame sp, STACK_SIZE, ra
25/*
26 * On entry:
27 *  a0  Thread* self
28 *  a1  dex_instructions
29 *  a2  ShadowFrame
30 *  a3  JValue* result_register
31 *
32 */
33
34ExecuteMterpImpl:
35    .cfi_startproc
36    .set noreorder
37    .cpload t9
38    .set reorder
39/* Save to the stack. Frame size = STACK_SIZE */
40    STACK_STORE_FULL()
41/* This directive will make sure all subsequent jal restore gp at a known offset */
42    .cprestore STACK_OFFSET_GP
43
44    /* Remember the return register */
45    sw      a3, SHADOWFRAME_RESULT_REGISTER_OFFSET(a2)
46
47    /* Remember the dex instruction pointer */
48    sw      a1, SHADOWFRAME_DEX_INSTRUCTIONS_OFFSET(a2)
49
50    /* set up "named" registers */
51    move    rSELF, a0
52    lw      a0, SHADOWFRAME_NUMBER_OF_VREGS_OFFSET(a2)
53    addu    rFP, a2, SHADOWFRAME_VREGS_OFFSET     # point to vregs.
54    EAS2(rREFS, rFP, a0)                          # point to reference array in shadow frame
55    lw      a0, SHADOWFRAME_DEX_PC_OFFSET(a2)     # Get starting dex_pc
56    EAS1(rPC, a1, a0)                             # Create direct pointer to 1st dex opcode
57    CFI_DEFINE_DEX_PC_WITH_OFFSET(CFI_TMP, CFI_DEX, 0)
58
59    EXPORT_PC()
60
61    /* Starting ibase */
62    lw      rIBASE, THREAD_CURRENT_IBASE_OFFSET(rSELF)
63
64    /* Set up for backwards branches & osr profiling */
65    lw      a0, OFF_FP_METHOD(rFP)
66    addu    a1, rFP, OFF_FP_SHADOWFRAME
67    move    a2, rSELF
68    JAL(MterpSetUpHotnessCountdown)        # (method, shadow_frame, self)
69    move    rPROFILE, v0                   # Starting hotness countdown to rPROFILE
70
71    /* start executing the instruction at rPC */
72    FETCH_INST()                           # load rINST from rPC
73    GET_INST_OPCODE(t0)                    # extract opcode from rINST
74    GOTO_OPCODE(t0)                        # jump to next instruction
75    /* NOTE: no fallthrough */
76