| Brandon Maier | dbe88da | 2023-01-12 10:27:45 -0600 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */ |
| 2 | /* |
| 3 | * Copyright (c) Facebook, Inc. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * This source code is licensed under both the BSD-style license (found in the |
| 7 | * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
| 8 | * in the COPYING file in the root directory of this source tree). |
| 9 | * You may select, at your option, one of the above-listed licenses. |
| 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * This file provides common libc dependencies that zstd requires. |
| 14 | * The purpose is to allow replacing this file with a custom implementation |
| 15 | * to compile zstd without libc support. |
| 16 | */ |
| 17 | |
| 18 | /* Need: |
| 19 | * NULL |
| 20 | * INT_MAX |
| 21 | * UINT_MAX |
| 22 | * ZSTD_memcpy() |
| 23 | * ZSTD_memset() |
| 24 | * ZSTD_memmove() |
| 25 | */ |
| 26 | #ifndef ZSTD_DEPS_COMMON |
| 27 | #define ZSTD_DEPS_COMMON |
| 28 | |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/stddef.h> |
| 31 | |
| 32 | #define ZSTD_memcpy(d,s,n) __builtin_memcpy((d),(s),(n)) |
| 33 | #define ZSTD_memmove(d,s,n) __builtin_memmove((d),(s),(n)) |
| 34 | #define ZSTD_memset(d,s,n) __builtin_memset((d),(s),(n)) |
| 35 | |
| 36 | #endif /* ZSTD_DEPS_COMMON */ |
| 37 | |
| 38 | /* |
| 39 | * Define malloc as always failing. That means the user must |
| 40 | * either use ZSTD_customMem or statically allocate memory. |
| 41 | * Need: |
| 42 | * ZSTD_malloc() |
| 43 | * ZSTD_free() |
| 44 | * ZSTD_calloc() |
| 45 | */ |
| 46 | #ifdef ZSTD_DEPS_NEED_MALLOC |
| 47 | #ifndef ZSTD_DEPS_MALLOC |
| 48 | #define ZSTD_DEPS_MALLOC |
| 49 | |
| 50 | #define ZSTD_malloc(s) ({ (void)(s); NULL; }) |
| 51 | #define ZSTD_free(p) ((void)(p)) |
| 52 | #define ZSTD_calloc(n,s) ({ (void)(n); (void)(s); NULL; }) |
| 53 | |
| 54 | #endif /* ZSTD_DEPS_MALLOC */ |
| 55 | #endif /* ZSTD_DEPS_NEED_MALLOC */ |
| 56 | |
| 57 | /* |
| 58 | * Provides 64-bit math support. |
| 59 | * Need: |
| 60 | * U64 ZSTD_div64(U64 dividend, U32 divisor) |
| 61 | */ |
| 62 | #ifdef ZSTD_DEPS_NEED_MATH64 |
| 63 | #ifndef ZSTD_DEPS_MATH64 |
| 64 | #define ZSTD_DEPS_MATH64 |
| 65 | |
| 66 | #include <linux/math64.h> |
| 67 | |
| 68 | static uint64_t ZSTD_div64(uint64_t dividend, uint32_t divisor) { |
| 69 | return div_u64(dividend, divisor); |
| 70 | } |
| 71 | |
| 72 | #endif /* ZSTD_DEPS_MATH64 */ |
| 73 | #endif /* ZSTD_DEPS_NEED_MATH64 */ |
| 74 | |
| 75 | /* |
| 76 | * This is only requested when DEBUGLEVEL >= 1, meaning |
| 77 | * it is disabled in production. |
| 78 | * Need: |
| 79 | * assert() |
| 80 | */ |
| 81 | #ifdef ZSTD_DEPS_NEED_ASSERT |
| 82 | #ifndef ZSTD_DEPS_ASSERT |
| 83 | #define ZSTD_DEPS_ASSERT |
| 84 | |
| 85 | #include <linux/kernel.h> |
| 86 | |
| 87 | #define assert(x) WARN_ON((x)) |
| 88 | |
| 89 | #endif /* ZSTD_DEPS_ASSERT */ |
| 90 | #endif /* ZSTD_DEPS_NEED_ASSERT */ |
| 91 | |
| 92 | /* |
| 93 | * This is only requested when DEBUGLEVEL >= 2, meaning |
| 94 | * it is disabled in production. |
| 95 | * Need: |
| 96 | * ZSTD_DEBUG_PRINT() |
| 97 | */ |
| 98 | #ifdef ZSTD_DEPS_NEED_IO |
| 99 | #ifndef ZSTD_DEPS_IO |
| 100 | #define ZSTD_DEPS_IO |
| 101 | |
| 102 | #include <linux/printk.h> |
| 103 | |
| 104 | #define ZSTD_DEBUG_PRINT(...) pr_debug(__VA_ARGS__) |
| 105 | |
| 106 | #endif /* ZSTD_DEPS_IO */ |
| 107 | #endif /* ZSTD_DEPS_NEED_IO */ |
| 108 | |
| 109 | /* |
| 110 | * Only requested when MSAN is enabled. |
| 111 | * Need: |
| 112 | * intptr_t |
| 113 | */ |
| 114 | #ifdef ZSTD_DEPS_NEED_STDINT |
| 115 | #ifndef ZSTD_DEPS_STDINT |
| 116 | #define ZSTD_DEPS_STDINT |
| 117 | |
| 118 | /* |
| 119 | * The Linux Kernel doesn't provide intptr_t, only uintptr_t, which |
| 120 | * is an unsigned long. |
| 121 | */ |
| 122 | typedef long intptr_t; |
| 123 | |
| 124 | #endif /* ZSTD_DEPS_STDINT */ |
| 125 | #endif /* ZSTD_DEPS_NEED_STDINT */ |