1 /* 2 * Copyright (c) 2020-2022, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef BL_COMMON_LD_H 8 #define BL_COMMON_LD_H 9 10 #include <platform_def.h> 11 12 #ifdef __aarch64__ 13 #define STRUCT_ALIGN 8 14 #define BSS_ALIGN 16 15 #else 16 #define STRUCT_ALIGN 4 17 #define BSS_ALIGN 8 18 #endif 19 20 #ifndef DATA_ALIGN 21 #define DATA_ALIGN 1 22 #endif 23 24 #define CPU_OPS \ 25 . = ALIGN(STRUCT_ALIGN); \ 26 __CPU_OPS_START__ = .; \ 27 KEEP(*(cpu_ops)) \ 28 __CPU_OPS_END__ = .; 29 30 #define PARSER_LIB_DESCS \ 31 . = ALIGN(STRUCT_ALIGN); \ 32 __PARSER_LIB_DESCS_START__ = .; \ 33 KEEP(*(.img_parser_lib_descs)) \ 34 __PARSER_LIB_DESCS_END__ = .; 35 36 #define RT_SVC_DESCS \ 37 . = ALIGN(STRUCT_ALIGN); \ 38 __RT_SVC_DESCS_START__ = .; \ 39 KEEP(*(rt_svc_descs)) \ 40 __RT_SVC_DESCS_END__ = .; 41 42 #define PMF_SVC_DESCS \ 43 . = ALIGN(STRUCT_ALIGN); \ 44 __PMF_SVC_DESCS_START__ = .; \ 45 KEEP(*(pmf_svc_descs)) \ 46 __PMF_SVC_DESCS_END__ = .; 47 48 #define FCONF_POPULATOR \ 49 . = ALIGN(STRUCT_ALIGN); \ 50 __FCONF_POPULATOR_START__ = .; \ 51 KEEP(*(.fconf_populator)) \ 52 __FCONF_POPULATOR_END__ = .; 53 54 /* 55 * Keep the .got section in the RO section as it is patched prior to enabling 56 * the MMU and having the .got in RO is better for security. GOT is a table of 57 * addresses so ensure pointer size alignment. 58 */ 59 #define GOT \ 60 . = ALIGN(STRUCT_ALIGN); \ 61 __GOT_START__ = .; \ 62 *(.got) \ 63 __GOT_END__ = .; 64 65 /* 66 * The base xlat table 67 * 68 * It is put into the rodata section if PLAT_RO_XLAT_TABLES=1, 69 * or into the bss section otherwise. 70 */ 71 #define BASE_XLAT_TABLE \ 72 . = ALIGN(16); \ 73 __BASE_XLAT_TABLE_START__ = .; \ 74 *(base_xlat_table) \ 75 __BASE_XLAT_TABLE_END__ = .; 76 77 #if PLAT_RO_XLAT_TABLES 78 #define BASE_XLAT_TABLE_RO BASE_XLAT_TABLE 79 #define BASE_XLAT_TABLE_BSS 80 #else 81 #define BASE_XLAT_TABLE_RO 82 #define BASE_XLAT_TABLE_BSS BASE_XLAT_TABLE 83 #endif 84 85 #define RODATA_COMMON \ 86 RT_SVC_DESCS \ 87 FCONF_POPULATOR \ 88 PMF_SVC_DESCS \ 89 PARSER_LIB_DESCS \ 90 CPU_OPS \ 91 GOT \ 92 BASE_XLAT_TABLE_RO 93 94 /* 95 * .data must be placed at a lower address than the stacks if the stack 96 * protector is enabled. Alternatively, the .data.stack_protector_canary 97 * section can be placed independently of the main .data section. 98 */ 99 #define DATA_SECTION \ 100 .data . : ALIGN(DATA_ALIGN) { \ 101 __DATA_START__ = .; \ 102 *(SORT_BY_ALIGNMENT(.data*)) \ 103 __DATA_END__ = .; \ 104 } 105 106 /* 107 * .rela.dyn needs to come after .data for the read-elf utility to parse 108 * this section correctly. 109 */ 110 #if __aarch64__ 111 #define RELA_DYN_NAME .rela.dyn 112 #define RELOC_SECTIONS_PATTERN *(.rela*) 113 #else 114 #define RELA_DYN_NAME .rel.dyn 115 #define RELOC_SECTIONS_PATTERN *(.rel*) 116 #endif 117 118 #define RELA_SECTION \ 119 RELA_DYN_NAME : ALIGN(STRUCT_ALIGN) { \ 120 __RELA_START__ = .; \ 121 RELOC_SECTIONS_PATTERN \ 122 __RELA_END__ = .; \ 123 } 124 125 #if !(defined(IMAGE_BL31) && RECLAIM_INIT_CODE) 126 #define STACK_SECTION \ 127 stacks (NOLOAD) : { \ 128 __STACKS_START__ = .; \ 129 *(tzfw_normal_stacks) \ 130 __STACKS_END__ = .; \ 131 } 132 #endif 133 134 /* 135 * If BL doesn't use any bakery lock then __PERCPU_BAKERY_LOCK_SIZE__ 136 * will be zero. For this reason, the only two valid values for 137 * __PERCPU_BAKERY_LOCK_SIZE__ are 0 or the platform defined value 138 * PLAT_PERCPU_BAKERY_LOCK_SIZE. 139 */ 140 #ifdef PLAT_PERCPU_BAKERY_LOCK_SIZE 141 #define BAKERY_LOCK_SIZE_CHECK \ 142 ASSERT((__PERCPU_BAKERY_LOCK_SIZE__ == 0) || \ 143 (__PERCPU_BAKERY_LOCK_SIZE__ == PLAT_PERCPU_BAKERY_LOCK_SIZE), \ 144 "PLAT_PERCPU_BAKERY_LOCK_SIZE does not match bakery lock requirements"); 145 #else 146 #define BAKERY_LOCK_SIZE_CHECK 147 #endif 148 149 /* 150 * Bakery locks are stored in normal .bss memory 151 * 152 * Each lock's data is spread across multiple cache lines, one per CPU, 153 * but multiple locks can share the same cache line. 154 * The compiler will allocate enough memory for one CPU's bakery locks, 155 * the remaining cache lines are allocated by the linker script 156 */ 157 #if !USE_COHERENT_MEM 158 #define BAKERY_LOCK_NORMAL \ 159 . = ALIGN(CACHE_WRITEBACK_GRANULE); \ 160 __BAKERY_LOCK_START__ = .; \ 161 __PERCPU_BAKERY_LOCK_START__ = .; \ 162 *(bakery_lock) \ 163 . = ALIGN(CACHE_WRITEBACK_GRANULE); \ 164 __PERCPU_BAKERY_LOCK_END__ = .; \ 165 __PERCPU_BAKERY_LOCK_SIZE__ = ABSOLUTE(__PERCPU_BAKERY_LOCK_END__ - __PERCPU_BAKERY_LOCK_START__); \ 166 . = . + (__PERCPU_BAKERY_LOCK_SIZE__ * (PLATFORM_CORE_COUNT - 1)); \ 167 __BAKERY_LOCK_END__ = .; \ 168 BAKERY_LOCK_SIZE_CHECK 169 #else 170 #define BAKERY_LOCK_NORMAL 171 #endif 172 173 /* 174 * Time-stamps are stored in normal .bss memory 175 * 176 * The compiler will allocate enough memory for one CPU's time-stamps, 177 * the remaining memory for other CPUs is allocated by the 178 * linker script 179 */ 180 #define PMF_TIMESTAMP \ 181 . = ALIGN(CACHE_WRITEBACK_GRANULE); \ 182 __PMF_TIMESTAMP_START__ = .; \ 183 KEEP(*(pmf_timestamp_array)) \ 184 . = ALIGN(CACHE_WRITEBACK_GRANULE); \ 185 __PMF_PERCPU_TIMESTAMP_END__ = .; \ 186 __PERCPU_TIMESTAMP_SIZE__ = ABSOLUTE(. - __PMF_TIMESTAMP_START__); \ 187 . = . + (__PERCPU_TIMESTAMP_SIZE__ * (PLATFORM_CORE_COUNT - 1)); \ 188 __PMF_TIMESTAMP_END__ = .; 189 190 191 /* 192 * The .bss section gets initialised to 0 at runtime. 193 * Its base address has bigger alignment for better performance of the 194 * zero-initialization code. 195 */ 196 #define BSS_SECTION \ 197 .bss (NOLOAD) : ALIGN(BSS_ALIGN) { \ 198 __BSS_START__ = .; \ 199 *(SORT_BY_ALIGNMENT(.bss*)) \ 200 *(COMMON) \ 201 BAKERY_LOCK_NORMAL \ 202 PMF_TIMESTAMP \ 203 BASE_XLAT_TABLE_BSS \ 204 __BSS_END__ = .; \ 205 } 206 207 /* 208 * The xlat_table section is for full, aligned page tables (4K). 209 * Removing them from .bss avoids forcing 4K alignment on 210 * the .bss section. The tables are initialized to zero by the translation 211 * tables library. 212 */ 213 #define XLAT_TABLE_SECTION \ 214 xlat_table (NOLOAD) : { \ 215 __XLAT_TABLE_START__ = .; \ 216 *(xlat_table) \ 217 __XLAT_TABLE_END__ = .; \ 218 } 219 220 #endif /* BL_COMMON_LD_H */ 221