1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * ld script to make ARM Linux kernel 4 * taken from the i386 version by Russell King 5 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz> 6 */ 7 8#include <asm-generic/vmlinux.lds.h> 9#include <asm/cache.h> 10#include <asm/kernel-pgtable.h> 11#include <asm/thread_info.h> 12#include <asm/memory.h> 13#include <asm/page.h> 14#include <asm/pgtable.h> 15 16#include "image.h" 17 18/* .exit.text needed in case of alternative patching */ 19#define ARM_EXIT_KEEP(x) x 20#define ARM_EXIT_DISCARD(x) 21 22OUTPUT_ARCH(aarch64) 23ENTRY(_text) 24 25jiffies = jiffies_64; 26 27#define HYPERVISOR_TEXT \ 28 /* \ 29 * Align to 4 KB so that \ 30 * a) the HYP vector table is at its minimum \ 31 * alignment of 2048 bytes \ 32 * b) the HYP init code will not cross a page \ 33 * boundary if its size does not exceed \ 34 * 4 KB (see related ASSERT() below) \ 35 */ \ 36 . = ALIGN(SZ_4K); \ 37 __hyp_idmap_text_start = .; \ 38 *(.hyp.idmap.text) \ 39 __hyp_idmap_text_end = .; \ 40 __hyp_text_start = .; \ 41 *(.hyp.text) \ 42 __hyp_text_end = .; 43 44#define IDMAP_TEXT \ 45 . = ALIGN(SZ_4K); \ 46 __idmap_text_start = .; \ 47 *(.idmap.text) \ 48 __idmap_text_end = .; 49 50#ifdef CONFIG_HIBERNATION 51#define HIBERNATE_TEXT \ 52 . = ALIGN(SZ_4K); \ 53 __hibernate_exit_text_start = .; \ 54 *(.hibernate_exit.text) \ 55 __hibernate_exit_text_end = .; 56#else 57#define HIBERNATE_TEXT 58#endif 59 60#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 61#define TRAMP_TEXT \ 62 . = ALIGN(PAGE_SIZE); \ 63 __entry_tramp_text_start = .; \ 64 *(.entry.tramp.text) \ 65 . = ALIGN(PAGE_SIZE); \ 66 __entry_tramp_text_end = .; 67#else 68#define TRAMP_TEXT 69#endif 70 71/* 72 * The size of the PE/COFF section that covers the kernel image, which 73 * runs from stext to _edata, must be a round multiple of the PE/COFF 74 * FileAlignment, which we set to its minimum value of 0x200. 'stext' 75 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 76 * boundary should be sufficient. 77 */ 78PECOFF_FILE_ALIGNMENT = 0x200; 79 80#ifdef CONFIG_EFI 81#define PECOFF_EDATA_PADDING \ 82 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 83#else 84#define PECOFF_EDATA_PADDING 85#endif 86 87SECTIONS 88{ 89 /* 90 * XXX: The linker does not define how output sections are 91 * assigned to input sections when there are multiple statements 92 * matching the same input section name. There is no documented 93 * order of matching. 94 */ 95 /DISCARD/ : { 96 ARM_EXIT_DISCARD(EXIT_TEXT) 97 ARM_EXIT_DISCARD(EXIT_DATA) 98 EXIT_CALL 99 *(.discard) 100 *(.discard.*) 101 *(.interp .dynamic) 102 *(.dynsym .dynstr .hash .gnu.hash) 103 *(.eh_frame) 104 } 105 106 . = KIMAGE_VADDR + TEXT_OFFSET; 107 108 .head.text : { 109 _text = .; 110 HEAD_TEXT 111 } 112 .text : { /* Real text segment */ 113 _stext = .; /* Text and read-only data */ 114 __exception_text_start = .; 115 *(.exception.text) 116 __exception_text_end = .; 117 IRQENTRY_TEXT 118 SOFTIRQENTRY_TEXT 119 ENTRY_TEXT 120 TEXT_TEXT 121 SCHED_TEXT 122 CPUIDLE_TEXT 123 LOCK_TEXT 124 KPROBES_TEXT 125 HYPERVISOR_TEXT 126 IDMAP_TEXT 127 HIBERNATE_TEXT 128 TRAMP_TEXT 129 *(.fixup) 130 *(.gnu.warning) 131 . = ALIGN(16); 132 *(.got) /* Global offset table */ 133 } 134 135 . = ALIGN(SEGMENT_ALIGN); 136 _etext = .; /* End of text section */ 137 138 RO_DATA(PAGE_SIZE) /* everything from this point to */ 139 EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */ 140 NOTES 141 142 . = ALIGN(PAGE_SIZE); 143 idmap_pg_dir = .; 144 . += IDMAP_DIR_SIZE; 145 146#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 147 tramp_pg_dir = .; 148 . += PAGE_SIZE; 149#endif 150 151#ifdef CONFIG_ARM64_SW_TTBR0_PAN 152 reserved_ttbr0 = .; 153 . += RESERVED_TTBR0_SIZE; 154#endif 155 swapper_pg_dir = .; 156 . += PAGE_SIZE; 157 swapper_pg_end = .; 158 159 . = ALIGN(SEGMENT_ALIGN); 160 __init_begin = .; 161 __inittext_begin = .; 162 163 INIT_TEXT_SECTION(8) 164 .exit.text : { 165 ARM_EXIT_KEEP(EXIT_TEXT) 166 } 167 168 . = ALIGN(4); 169 .altinstructions : { 170 __alt_instructions = .; 171 *(.altinstructions) 172 __alt_instructions_end = .; 173 } 174 .altinstr_replacement : { 175 *(.altinstr_replacement) 176 } 177 178 . = ALIGN(PAGE_SIZE); 179 __inittext_end = .; 180 __initdata_begin = .; 181 182 .init.data : { 183 INIT_DATA 184 INIT_SETUP(16) 185 INIT_CALLS 186 CON_INITCALL 187 INIT_RAM_FS 188 *(.init.rodata.* .init.bss) /* from the EFI stub */ 189 } 190 .exit.data : { 191 ARM_EXIT_KEEP(EXIT_DATA) 192 } 193 194 PERCPU_SECTION(L1_CACHE_BYTES) 195 196 .rela.dyn : ALIGN(8) { 197 *(.rela .rela*) 198 } 199 200 __rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR); 201 __rela_size = SIZEOF(.rela.dyn); 202 203#ifdef CONFIG_RELR 204 .relr.dyn : ALIGN(8) { 205 *(.relr.dyn) 206 } 207 208 __relr_offset = ABSOLUTE(ADDR(.relr.dyn) - KIMAGE_VADDR); 209 __relr_size = SIZEOF(.relr.dyn); 210#endif 211 212 . = ALIGN(SEGMENT_ALIGN); 213 __initdata_end = .; 214 __init_end = .; 215 216 _data = .; 217 _sdata = .; 218 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 219 220 /* 221 * Data written with the MMU off but read with the MMU on requires 222 * cache lines to be invalidated, discarding up to a Cache Writeback 223 * Granule (CWG) of data from the cache. Keep the section that 224 * requires this type of maintenance to be in its own Cache Writeback 225 * Granule (CWG) area so the cache maintenance operations don't 226 * interfere with adjacent data. 227 */ 228 .mmuoff.data.write : ALIGN(SZ_2K) { 229 __mmuoff_data_start = .; 230 *(.mmuoff.data.write) 231 } 232 . = ALIGN(SZ_2K); 233 .mmuoff.data.read : { 234 *(.mmuoff.data.read) 235 __mmuoff_data_end = .; 236 } 237 238 PECOFF_EDATA_PADDING 239 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 240 _edata = .; 241 242 BSS_SECTION(0, 0, 0) 243 244 . = ALIGN(PAGE_SIZE); 245 init_pg_dir = .; 246 . += INIT_DIR_SIZE; 247 init_pg_end = .; 248 249 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 250 _end = .; 251 252 STABS_DEBUG 253 254 HEAD_SYMBOLS 255} 256 257/* 258 * The HYP init code and ID map text can't be longer than a page each, 259 * and should not cross a page boundary. 260 */ 261ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 262 "HYP init code too big or misaligned") 263ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 264 "ID map text too big or misaligned") 265#ifdef CONFIG_HIBERNATION 266ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1)) 267 <= SZ_4K, "Hibernate exit text too big or misaligned") 268#endif 269#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 270ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) == PAGE_SIZE, 271 "Entry trampoline text too big") 272#endif 273/* 274 * If padding is applied before .head.text, virt<->phys conversions will fail. 275 */ 276ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned") 277