1 /*
2  * Copyright (C) 2012 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 #include <math.h>
18 #include <string.h>
19 
20 #include "arch/arm/asm_support_arm.h"
21 #include "base/bit_utils.h"
22 #include "entrypoints/entrypoint_utils.h"
23 #include "entrypoints/jni/jni_entrypoints.h"
24 #include "entrypoints/math_entrypoints.h"
25 #include "entrypoints/quick/quick_alloc_entrypoints.h"
26 #include "entrypoints/quick/quick_default_externs.h"
27 #include "entrypoints/quick/quick_default_init_entrypoints.h"
28 #include "entrypoints/quick/quick_entrypoints.h"
29 #include "entrypoints/runtime_asm_entrypoints.h"
30 #include "interpreter/interpreter.h"
31 
32 namespace art HIDDEN {
33 
34 // Cast entrypoints.
35 extern "C" size_t artInstanceOfFromCode(mirror::Object* obj, mirror::Class* ref_class);
36 
37 // Read barrier entrypoints.
38 // art_quick_read_barrier_mark_regX uses an non-standard calling
39 // convention: it expects its input in register X and returns its
40 // result in that same register, and saves and restores all
41 // caller-save registers.
42 extern "C" mirror::Object* art_quick_read_barrier_mark_reg00(mirror::Object*);
43 extern "C" mirror::Object* art_quick_read_barrier_mark_reg01(mirror::Object*);
44 extern "C" mirror::Object* art_quick_read_barrier_mark_reg02(mirror::Object*);
45 extern "C" mirror::Object* art_quick_read_barrier_mark_reg03(mirror::Object*);
46 extern "C" mirror::Object* art_quick_read_barrier_mark_reg04(mirror::Object*);
47 extern "C" mirror::Object* art_quick_read_barrier_mark_reg05(mirror::Object*);
48 extern "C" mirror::Object* art_quick_read_barrier_mark_reg06(mirror::Object*);
49 extern "C" mirror::Object* art_quick_read_barrier_mark_reg07(mirror::Object*);
50 extern "C" mirror::Object* art_quick_read_barrier_mark_reg08(mirror::Object*);
51 extern "C" mirror::Object* art_quick_read_barrier_mark_reg09(mirror::Object*);
52 extern "C" mirror::Object* art_quick_read_barrier_mark_reg10(mirror::Object*);
53 extern "C" mirror::Object* art_quick_read_barrier_mark_reg11(mirror::Object*);
54 extern "C" mirror::Object* art_quick_read_barrier_mark_reg12(mirror::Object*);
55 
56 extern "C" mirror::Object* art_quick_read_barrier_mark_introspection(mirror::Object*);
57 extern "C" mirror::Object* art_quick_read_barrier_mark_introspection_narrow(mirror::Object*);
58 extern "C" mirror::Object* art_quick_read_barrier_mark_introspection_arrays(mirror::Object*);
59 extern "C" mirror::Object* art_quick_read_barrier_mark_introspection_gc_roots_wide(mirror::Object*);
60 extern "C" mirror::Object* art_quick_read_barrier_mark_introspection_gc_roots_narrow(
61     mirror::Object*);
62 extern "C" mirror::Object* art_quick_read_barrier_mark_introspection_intrinsic_cas(mirror::Object*);
63 
64 // Used by soft float.
65 // Single-precision FP arithmetics.
66 extern "C" float fmodf(float a, float b);              // REM_FLOAT[_2ADDR]
67 // Double-precision FP arithmetics.
68 extern "C" double fmod(double a, double b);            // REM_DOUBLE[_2ADDR]
69 
70 // Used by hard float.
71 extern "C" float art_quick_fmodf(float a, float b);    // REM_FLOAT[_2ADDR]
72 extern "C" double art_quick_fmod(double a, double b);  // REM_DOUBLE[_2ADDR]
73 
74 // Integer arithmetics.
75 extern "C" int __aeabi_idivmod(int32_t, int32_t);  // [DIV|REM]_INT[_2ADDR|_LIT8|_LIT16]
76 
77 // Long long arithmetics - REM_LONG[_2ADDR] and DIV_LONG[_2ADDR]
78 extern "C" int64_t __aeabi_ldivmod(int64_t, int64_t);
79 
UpdateReadBarrierEntrypoints(QuickEntryPoints * qpoints,bool is_active)80 void UpdateReadBarrierEntrypoints(QuickEntryPoints* qpoints, bool is_active) {
81   qpoints->SetReadBarrierMarkReg00(is_active ? art_quick_read_barrier_mark_reg00 : nullptr);
82   qpoints->SetReadBarrierMarkReg01(is_active ? art_quick_read_barrier_mark_reg01 : nullptr);
83   qpoints->SetReadBarrierMarkReg02(is_active ? art_quick_read_barrier_mark_reg02 : nullptr);
84   qpoints->SetReadBarrierMarkReg03(is_active ? art_quick_read_barrier_mark_reg03 : nullptr);
85   qpoints->SetReadBarrierMarkReg04(is_active ? art_quick_read_barrier_mark_reg04 : nullptr);
86   qpoints->SetReadBarrierMarkReg05(is_active ? art_quick_read_barrier_mark_reg05 : nullptr);
87   qpoints->SetReadBarrierMarkReg06(is_active ? art_quick_read_barrier_mark_reg06 : nullptr);
88   qpoints->SetReadBarrierMarkReg07(is_active ? art_quick_read_barrier_mark_reg07 : nullptr);
89   qpoints->SetReadBarrierMarkReg08(is_active ? art_quick_read_barrier_mark_reg08 : nullptr);
90   qpoints->SetReadBarrierMarkReg09(is_active ? art_quick_read_barrier_mark_reg09 : nullptr);
91   qpoints->SetReadBarrierMarkReg10(is_active ? art_quick_read_barrier_mark_reg10 : nullptr);
92   qpoints->SetReadBarrierMarkReg11(is_active ? art_quick_read_barrier_mark_reg11 : nullptr);
93 
94   if (gUseReadBarrier && kUseBakerReadBarrier) {
95     // For the alignment check, strip the Thumb mode bit.
96     DCHECK_ALIGNED(reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection) - 1u,
97                    256u);
98     // Check the field narrow entrypoint offset from the introspection entrypoint.
99     intptr_t narrow_diff =
100         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection_narrow) -
101         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection);
102     DCHECK_EQ(BAKER_MARK_INTROSPECTION_FIELD_LDR_NARROW_ENTRYPOINT_OFFSET, narrow_diff);
103     // Check array switch cases offsets from the introspection entrypoint.
104     intptr_t array_diff =
105         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection_arrays) -
106         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection);
107     DCHECK_EQ(BAKER_MARK_INTROSPECTION_ARRAY_SWITCH_OFFSET, array_diff);
108     // Check the GC root entrypoint offsets from the introspection entrypoint.
109     intptr_t gc_roots_wide_diff =
110         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection_gc_roots_wide) -
111         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection);
112     DCHECK_EQ(BAKER_MARK_INTROSPECTION_GC_ROOT_LDR_WIDE_ENTRYPOINT_OFFSET, gc_roots_wide_diff);
113     intptr_t gc_roots_narrow_diff =
114         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection_gc_roots_narrow) -
115         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection);
116     DCHECK_EQ(BAKER_MARK_INTROSPECTION_GC_ROOT_LDR_NARROW_ENTRYPOINT_OFFSET, gc_roots_narrow_diff);
117     intptr_t intrinsic_cas_diff =
118         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection_intrinsic_cas) -
119         reinterpret_cast<intptr_t>(art_quick_read_barrier_mark_introspection);
120     DCHECK_EQ(BAKER_MARK_INTROSPECTION_INTRINSIC_CAS_ENTRYPOINT_OFFSET, intrinsic_cas_diff);
121     // The register 12, i.e. IP, is reserved, so there is no art_quick_read_barrier_mark_reg12.
122     // We're using the entry to hold a pointer to the introspection entrypoint instead.
123     qpoints->SetReadBarrierMarkReg12(
124         is_active ? art_quick_read_barrier_mark_introspection : nullptr);
125   }
126 }
127 
InitEntryPoints(JniEntryPoints * jpoints,QuickEntryPoints * qpoints,bool monitor_jni_entry_exit)128 void InitEntryPoints(JniEntryPoints* jpoints,
129                      QuickEntryPoints* qpoints,
130                      bool monitor_jni_entry_exit) {
131   DefaultInitEntryPoints(jpoints, qpoints, monitor_jni_entry_exit);
132 
133   // Cast
134   qpoints->SetInstanceofNonTrivial(artInstanceOfFromCode);
135   qpoints->SetCheckInstanceOf(art_quick_check_instance_of);
136 
137   // Math
138   qpoints->SetIdivmod(__aeabi_idivmod);
139   qpoints->SetLdiv(__aeabi_ldivmod);
140   qpoints->SetLmod(__aeabi_ldivmod);  // result returned in r2:r3
141   qpoints->SetLmul(art_quick_mul_long);
142   qpoints->SetShlLong(art_quick_shl_long);
143   qpoints->SetShrLong(art_quick_shr_long);
144   qpoints->SetUshrLong(art_quick_ushr_long);
145   qpoints->SetFmod(art_quick_fmod);
146   qpoints->SetFmodf(art_quick_fmodf);
147   qpoints->SetD2l(art_quick_d2l);
148   qpoints->SetF2l(art_quick_f2l);
149   qpoints->SetL2f(art_quick_l2f);
150 
151   // More math.
152   qpoints->SetCos(cos);
153   qpoints->SetSin(sin);
154   qpoints->SetAcos(acos);
155   qpoints->SetAsin(asin);
156   qpoints->SetAtan(atan);
157   qpoints->SetAtan2(atan2);
158   qpoints->SetPow(pow);
159   qpoints->SetCbrt(cbrt);
160   qpoints->SetCosh(cosh);
161   qpoints->SetExp(exp);
162   qpoints->SetExpm1(expm1);
163   qpoints->SetHypot(hypot);
164   qpoints->SetLog(log);
165   qpoints->SetLog10(log10);
166   qpoints->SetNextAfter(nextafter);
167   qpoints->SetSinh(sinh);
168   qpoints->SetTan(tan);
169   qpoints->SetTanh(tanh);
170 
171   // Intrinsics
172   qpoints->SetIndexOf(art_quick_indexof);
173   // The ARM StringCompareTo intrinsic does not call the runtime.
174   qpoints->SetStringCompareTo(nullptr);
175   qpoints->SetMemcpy(memcpy);
176 
177   // Read barrier.
178   UpdateReadBarrierEntrypoints(qpoints, /*is_active=*/ false);
179   qpoints->SetReadBarrierMarkReg12(nullptr);  // Cannot use register 12 (IP) to pass arguments.
180   qpoints->SetReadBarrierMarkReg13(nullptr);  // Cannot use register 13 (SP) to pass arguments.
181   qpoints->SetReadBarrierMarkReg14(nullptr);  // Cannot use register 14 (LR) to pass arguments.
182   qpoints->SetReadBarrierMarkReg15(nullptr);  // Cannot use register 15 (PC) to pass arguments.
183   // ARM has only 16 core registers.
184   qpoints->SetReadBarrierMarkReg16(nullptr);
185   qpoints->SetReadBarrierMarkReg17(nullptr);
186   qpoints->SetReadBarrierMarkReg18(nullptr);
187   qpoints->SetReadBarrierMarkReg19(nullptr);
188   qpoints->SetReadBarrierMarkReg20(nullptr);
189   qpoints->SetReadBarrierMarkReg21(nullptr);
190   qpoints->SetReadBarrierMarkReg22(nullptr);
191   qpoints->SetReadBarrierMarkReg23(nullptr);
192   qpoints->SetReadBarrierMarkReg24(nullptr);
193   qpoints->SetReadBarrierMarkReg25(nullptr);
194   qpoints->SetReadBarrierMarkReg26(nullptr);
195   qpoints->SetReadBarrierMarkReg27(nullptr);
196   qpoints->SetReadBarrierMarkReg28(nullptr);
197   qpoints->SetReadBarrierMarkReg29(nullptr);
198   qpoints->SetReadBarrierSlow(artReadBarrierSlow);
199   qpoints->SetReadBarrierForRootSlow(artReadBarrierForRootSlow);
200 }
201 
202 }  // namespace art
203