entry.S revision a8b91c52fd8a90b784835dfe1f8898035266c4dd 
1
2/*
3 * Copyright (C) 2008 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17/*
18 * Interpreter entry point.
19 */
20
21#define ASSIST_DEBUGGER 1
22
23    .text
24    .align 2
25    .global dvmMterpStdRun
26    .ent dvmMterpStdRun
27    .frame sp, STACK_SIZE, ra
28/*
29 * On entry:
30 *  r0  Thread* self
31 *
32 * The return comes via a call to dvmMterpStdBail().
33 */
34
35dvmMterpStdRun:
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    addu      fp, sp, STACK_SIZE           #  Move Frame Pointer to the base of frame
45    /* save stack pointer, add magic word for debuggerd */
46    sw        sp, offThread_bailPtr(a0)      # Save SP
47
48    /* set up "named" registers, figure out entry point */
49    move      rSELF, a0                    #  set rSELF
50    LOAD_PC_FROM_SELF()
51    LOAD_FP_FROM_SELF()
52    lw        rIBASE, offThread_curHandlerTable(rSELF)
53
54#if defined(WITH_JIT)
55.LentryInstr:
56    /* Entry is always a possible trace start */
57    lw        a0, offThread_pJitProfTable(rSELF)
58    FETCH_INST()                           #  load rINST from rPC
59    sw        zero, offThread_inJitCodeCache(rSELF)
60#if !defined(WITH_SELF_VERIFICATION)
61    bnez      a0, common_updateProfile     # profiling is enabled
62#else
63    lw       a2, offThread_shadowSpace(rSELF) # to find out the jit exit state
64    beqz     a0, 1f                        # profiling is disabled
65    lw       a3, offShadowSpace_jitExitState(a2) # jit exit state
66    li	     t0, kSVSTraceSelect
67    bne      a3, t0, 2f
68    li       a2, kJitTSelectRequestHot     # ask for trace selection
69    b        common_selectTrace            # go build the trace
702:
71    li       a4, kSVSNoProfile
72    beq      a3, a4, 1f                    # don't profile the next instruction?
73    b        common_updateProfile          # collect profiles
74#endif
751:
76    GET_INST_OPCODE(t0)                    #  extract opcode from rINST
77    GOTO_OPCODE(t0)                        #  jump to next instruction
78#else
79    /* start executing the instruction at rPC */
80    FETCH_INST()                           #  load rINST from rPC
81    GET_INST_OPCODE(t0)                    #  extract opcode from rINST
82    GOTO_OPCODE(t0)                        #  jump to next instruction
83#endif
84
85.Lbad_arg:
86    la        a0, .LstrBadEntryPoint
87    #a1 holds value of entryPoint
88    JAL(printf)
89    JAL(dvmAbort)
90
91    .end dvmMterpStdRun
92
93    .global dvmMterpStdBail
94    .ent dvmMterpStdBail
95
96/* Restore the stack pointer and all the registers stored at sp from the save
97 * point established  on entry. Return to whoever called dvmMterpStdRun.
98 *
99 * On entry:
100 *   a0    Thread* self
101 */
102dvmMterpStdBail:
103    lw        sp, offThread_bailPtr(a0)      #  Restore sp
104    STACK_LOAD_FULL()
105    jr        ra
106
107    .end dvmMterpStdBail
108