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43 lines
1.4 KiB
43 lines
1.4 KiB
/* |
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* Copyright (C) 2014 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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class A { |
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public: |
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virtual int getRandomNumber() { |
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return 4; // chosen by fair dice roll. |
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// guaranteed to be random. |
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} |
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virtual ~A() {} |
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}; |
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A a; |
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// nested macros to make it easy to define a large amount of read-only data |
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// which will require relocation. |
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#define A_16 &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, |
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#define A_128 A_16 A_16 A_16 A_16 A_16 A_16 A_16 A_16 |
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#define A_1024 A_128 A_128 A_128 A_128 A_128 A_128 A_128 A_128 |
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extern "C" A* const lots_of_relro[] = { |
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A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 |
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}; |
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extern "C" int getRandomNumber() { |
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// access the relro section (twice, in fact, once for the pointer, and once |
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// for the vtable of A) to check it's actually there. |
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return lots_of_relro[0]->getRandomNumber(); |
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}
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