1 /* 2 * Copyright (C) 2018 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 // 18 // This file is used to generate #defines for use in assembly source code. 19 // 20 // The content of this file will be used to compile an object file 21 // (generated as human readable assembly text file, not as binary). 22 // This text file will then be post-processed by a python script to find 23 // and extract the constants and generate the final asm_defines.h header. 24 // 25 26 // We use "asm volatile" to generate text that will stand out in the 27 // compiler generated intermediate assembly file (eg. ">>FOO 42 0<<"). 28 // We emit all values as 64-bit integers (which we will printed as text). 29 // We also store a flag which specifies whether the constant is negative. 30 // Note that "asm volatile" must be inside a method to please the compiler. 31 #define ASM_DEFINE(NAME, EXPR) \ 32 void AsmDefineHelperFor_##NAME() { \ 33 asm volatile("\n.ascii \">>" #NAME " %0 %1<<\"" \ 34 :: "i" (static_cast<int64_t>(EXPR)), "i" ((EXPR) < 0 ? 1 : 0)); \ 35 } 36 #include "asm_defines.def" 37