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) 103 } 104 105 . = KIMAGE_VADDR + TEXT_OFFSET; 106 107 .head.text : { 108 _text = .; 109 HEAD_TEXT 110 } 111 .text : { /* Real text segment */ 112 _stext = .; /* Text and read-only data */ 113 __exception_text_start = .; 114 *(.exception.text) 115 __exception_text_end = .; 116 IRQENTRY_TEXT 117 SOFTIRQENTRY_TEXT 118 ENTRY_TEXT 119 TEXT_TEXT 120 SCHED_TEXT 121 CPUIDLE_TEXT 122 LOCK_TEXT 123 KPROBES_TEXT 124 HYPERVISOR_TEXT 125 IDMAP_TEXT 126 HIBERNATE_TEXT 127 TRAMP_TEXT 128 *(.fixup) 129 *(.gnu.warning) 130 . = ALIGN(16); 131 *(.got) /* Global offset table */ 132 } 133 134 . = ALIGN(SEGMENT_ALIGN); 135 _etext = .; /* End of text section */ 136 137 RO_DATA(PAGE_SIZE) /* everything from this point to */ 138 EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */ 139 NOTES 140 141 . = ALIGN(PAGE_SIZE); 142 idmap_pg_dir = .; 143 . += IDMAP_DIR_SIZE; 144 145#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 146 tramp_pg_dir = .; 147 . += PAGE_SIZE; 148#endif 149 150#ifdef CONFIG_ARM64_SW_TTBR0_PAN 151 reserved_ttbr0 = .; 152 . += RESERVED_TTBR0_SIZE; 153#endif 154 swapper_pg_dir = .; 155 . += PAGE_SIZE; 156 swapper_pg_end = .; 157 158 . = ALIGN(SEGMENT_ALIGN); 159 __init_begin = .; 160 __inittext_begin = .; 161 162 INIT_TEXT_SECTION(8) 163 .exit.text : { 164 ARM_EXIT_KEEP(EXIT_TEXT) 165 } 166 167 . = ALIGN(4); 168 .altinstructions : { 169 __alt_instructions = .; 170 *(.altinstructions) 171 __alt_instructions_end = .; 172 } 173 .altinstr_replacement : { 174 *(.altinstr_replacement) 175 } 176 177 . = ALIGN(PAGE_SIZE); 178 __inittext_end = .; 179 __initdata_begin = .; 180 181 .init.data : { 182 INIT_DATA 183 INIT_SETUP(16) 184 INIT_CALLS 185 CON_INITCALL 186 INIT_RAM_FS 187 *(.init.rodata.* .init.bss) /* from the EFI stub */ 188 } 189 .exit.data : { 190 ARM_EXIT_KEEP(EXIT_DATA) 191 } 192 193 PERCPU_SECTION(L1_CACHE_BYTES) 194 195 .rela : ALIGN(8) { 196 *(.rela .rela*) 197 } 198 199 __rela_offset = ABSOLUTE(ADDR(.rela) - KIMAGE_VADDR); 200 __rela_size = SIZEOF(.rela); 201 202 . = ALIGN(SEGMENT_ALIGN); 203 __initdata_end = .; 204 __init_end = .; 205 206 _data = .; 207 _sdata = .; 208 RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 209 210 /* 211 * Data written with the MMU off but read with the MMU on requires 212 * cache lines to be invalidated, discarding up to a Cache Writeback 213 * Granule (CWG) of data from the cache. Keep the section that 214 * requires this type of maintenance to be in its own Cache Writeback 215 * Granule (CWG) area so the cache maintenance operations don't 216 * interfere with adjacent data. 217 */ 218 .mmuoff.data.write : ALIGN(SZ_2K) { 219 __mmuoff_data_start = .; 220 *(.mmuoff.data.write) 221 } 222 . = ALIGN(SZ_2K); 223 .mmuoff.data.read : { 224 *(.mmuoff.data.read) 225 __mmuoff_data_end = .; 226 } 227 228 PECOFF_EDATA_PADDING 229 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 230 _edata = .; 231 232 BSS_SECTION(0, 0, 0) 233 234 . = ALIGN(PAGE_SIZE); 235 init_pg_dir = .; 236 . += INIT_DIR_SIZE; 237 init_pg_end = .; 238 239 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 240 _end = .; 241 242 STABS_DEBUG 243 244 HEAD_SYMBOLS 245} 246 247/* 248 * The HYP init code and ID map text can't be longer than a page each, 249 * and should not cross a page boundary. 250 */ 251ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 252 "HYP init code too big or misaligned") 253ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 254 "ID map text too big or misaligned") 255#ifdef CONFIG_HIBERNATION 256ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1)) 257 <= SZ_4K, "Hibernate exit text too big or misaligned") 258#endif 259#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 260ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) == PAGE_SIZE, 261 "Entry trampoline text too big") 262#endif 263/* 264 * If padding is applied before .head.text, virt<->phys conversions will fail. 265 */ 266ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned") 267