1 /* 2 * Copyright 2019 The Hafnium Authors. 3 * 4 * Use of this source code is governed by a BSD-style 5 * license that can be found in the LICENSE file or at 6 * https://opensource.org/licenses/BSD-3-Clause. 7 */ 8 9 /** 10 * This header file is intended for use by files compiled with the 11 * 'offset_size_header' build rule. See overview in 'offset_size_header.gni'. 12 */ 13 14 #pragma once 15 16 #if (defined GENERATE_BINARY) && (defined VERIFY_HEADER) 17 #error Only one action can be specified 18 19 #elif defined GENERATE_BINARY 20 21 /** 22 * File being compiled to generate binaries with definitions of constants. 23 */ 24 25 /** 26 * Emit a function with an embedded string in the format: 27 * <HAFNIUM_DEFINE name value /> 28 * These will be recognized by a script that generates the header file. 29 */ 30 #define DEFINE(sym, val) \ 31 void gen_header__##sym(void) \ 32 { \ 33 __asm__ volatile( \ 34 "\n" \ 35 ".ascii \"\\n<HAFNIUM_DEFINE " #sym \ 36 " %0 />\\n\"\n" \ 37 ".align 8\n" /* Align epilogue */ \ 38 : \ 39 : "i"(val)); \ 40 } 41 42 #define DEFINE_SIZEOF(sym, type) DEFINE(sym, sizeof(type)) 43 #define DEFINE_OFFSETOF(sym, type, field) DEFINE(sym, offsetof(type, field)) 44 45 #elif defined VERIFY_HEADER 46 47 /** 48 * File being compiled as part of the main build to check the values in 49 * the auto-generated header file (included using a command-line flag). 50 */ 51 52 #include "hf/static_assert.h" 53 54 #define DEFINE_SIZEOF(sym, type) \ 55 void gen_header__##sym(void) \ 56 { \ 57 static_assert(sizeof(type) == sym, \ 58 "Generated struct size mismatch"); \ 59 } 60 61 #define DEFINE_OFFSETOF(sym, type, field) \ 62 void gen_header__##sym(void) \ 63 { \ 64 static_assert(offsetof(type, field) == sym, \ 65 "Generated struct offset mismatch"); \ 66 } 67 68 #else 69 #error No action specified 70 #endif 71