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/hyp_image.h> 9#ifdef CONFIG_KVM 10#define HYPERVISOR_EXTABLE \ 11 . = ALIGN(SZ_8); \ 12 __start___kvm_ex_table = .; \ 13 *(__kvm_ex_table) \ 14 __stop___kvm_ex_table = .; 15 16#define HYPERVISOR_DATA_SECTIONS \ 17 HYP_SECTION_NAME(.rodata) : { \ 18 . = ALIGN(PAGE_SIZE); \ 19 __hyp_rodata_start = .; \ 20 *(HYP_SECTION_NAME(.data..ro_after_init)) \ 21 *(HYP_SECTION_NAME(.rodata)) \ 22 . = ALIGN(PAGE_SIZE); \ 23 __hyp_rodata_end = .; \ 24 } 25 26#define HYPERVISOR_PERCPU_SECTION \ 27 . = ALIGN(PAGE_SIZE); \ 28 HYP_SECTION_NAME(.data..percpu) : { \ 29 *(HYP_SECTION_NAME(.data..percpu)) \ 30 } 31 32#define HYPERVISOR_RELOC_SECTION \ 33 .hyp.reloc : ALIGN(4) { \ 34 __hyp_reloc_begin = .; \ 35 *(.hyp.reloc) \ 36 __hyp_reloc_end = .; \ 37 } 38 39#define BSS_FIRST_SECTIONS \ 40 __hyp_bss_start = .; \ 41 *(HYP_SECTION_NAME(.bss)) \ 42 . = ALIGN(PAGE_SIZE); \ 43 __hyp_bss_end = .; 44 45/* 46 * We require that __hyp_bss_start and __bss_start are aligned, and enforce it 47 * with an assertion. But the BSS_SECTION macro places an empty .sbss section 48 * between them, which can in some cases cause the linker to misalign them. To 49 * work around the issue, force a page alignment for __bss_start. 50 */ 51#define SBSS_ALIGN PAGE_SIZE 52#else /* CONFIG_KVM */ 53#define HYPERVISOR_EXTABLE 54#define HYPERVISOR_DATA_SECTIONS 55#define HYPERVISOR_PERCPU_SECTION 56#define HYPERVISOR_RELOC_SECTION 57#define SBSS_ALIGN 0 58#endif 59 60#define RO_EXCEPTION_TABLE_ALIGN 4 61#define RUNTIME_DISCARD_EXIT 62 63#include <asm-generic/vmlinux.lds.h> 64#include <asm/cache.h> 65#include <asm/kernel-pgtable.h> 66#include <asm/kexec.h> 67#include <asm/memory.h> 68#include <asm/page.h> 69 70#include "image.h" 71 72OUTPUT_ARCH(aarch64) 73ENTRY(_text) 74 75jiffies = jiffies_64; 76 77#define HYPERVISOR_TEXT \ 78 . = ALIGN(PAGE_SIZE); \ 79 __hyp_idmap_text_start = .; \ 80 *(.hyp.idmap.text) \ 81 __hyp_idmap_text_end = .; \ 82 __hyp_text_start = .; \ 83 *(.hyp.text) \ 84 HYPERVISOR_EXTABLE \ 85 . = ALIGN(PAGE_SIZE); \ 86 __hyp_text_end = .; 87 88#define IDMAP_TEXT \ 89 . = ALIGN(SZ_4K); \ 90 __idmap_text_start = .; \ 91 *(.idmap.text) \ 92 __idmap_text_end = .; 93 94#ifdef CONFIG_HIBERNATION 95#define HIBERNATE_TEXT \ 96 __hibernate_exit_text_start = .; \ 97 *(.hibernate_exit.text) \ 98 __hibernate_exit_text_end = .; 99#else 100#define HIBERNATE_TEXT 101#endif 102 103#ifdef CONFIG_KEXEC_CORE 104#define KEXEC_TEXT \ 105 __relocate_new_kernel_start = .; \ 106 *(.kexec_relocate.text) \ 107 __relocate_new_kernel_end = .; 108#else 109#define KEXEC_TEXT 110#endif 111 112#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 113#define TRAMP_TEXT \ 114 . = ALIGN(PAGE_SIZE); \ 115 __entry_tramp_text_start = .; \ 116 *(.entry.tramp.text) \ 117 . = ALIGN(PAGE_SIZE); \ 118 __entry_tramp_text_end = .; \ 119 *(.entry.tramp.rodata) 120#else 121#define TRAMP_TEXT 122#endif 123 124/* 125 * The size of the PE/COFF section that covers the kernel image, which 126 * runs from _stext to _edata, must be a round multiple of the PE/COFF 127 * FileAlignment, which we set to its minimum value of 0x200. '_stext' 128 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 129 * boundary should be sufficient. 130 */ 131PECOFF_FILE_ALIGNMENT = 0x200; 132 133#ifdef CONFIG_EFI 134#define PECOFF_EDATA_PADDING \ 135 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 136#else 137#define PECOFF_EDATA_PADDING 138#endif 139 140SECTIONS 141{ 142 /* 143 * XXX: The linker does not define how output sections are 144 * assigned to input sections when there are multiple statements 145 * matching the same input section name. There is no documented 146 * order of matching. 147 */ 148 DISCARDS 149 /DISCARD/ : { 150 *(.interp .dynamic) 151 *(.dynsym .dynstr .hash .gnu.hash) 152 } 153 154 . = KIMAGE_VADDR; 155 156 .head.text : { 157 _text = .; 158 HEAD_TEXT 159 } 160 .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */ 161 _stext = .; /* Text and read-only data */ 162 IRQENTRY_TEXT 163 SOFTIRQENTRY_TEXT 164 ENTRY_TEXT 165 TEXT_TEXT 166 SCHED_TEXT 167 CPUIDLE_TEXT 168 LOCK_TEXT 169 KPROBES_TEXT 170 HYPERVISOR_TEXT 171 IDMAP_TEXT 172 *(.gnu.warning) 173 . = ALIGN(16); 174 *(.got) /* Global offset table */ 175 } 176 177 /* 178 * Make sure that the .got.plt is either completely empty or it 179 * contains only the lazy dispatch entries. 180 */ 181 .got.plt : { *(.got.plt) } 182 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 183 "Unexpected GOT/PLT entries detected!") 184 185 . = ALIGN(SEGMENT_ALIGN); 186 _etext = .; /* End of text section */ 187 188 /* everything from this point to __init_begin will be marked RO NX */ 189 RO_DATA(PAGE_SIZE) 190 191 HYPERVISOR_DATA_SECTIONS 192 193 /* code sections that are never executed via the kernel mapping */ 194 .rodata.text : { 195 TRAMP_TEXT 196 HIBERNATE_TEXT 197 KEXEC_TEXT 198 . = ALIGN(PAGE_SIZE); 199 } 200 201 idmap_pg_dir = .; 202 . += PAGE_SIZE; 203 204#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 205 tramp_pg_dir = .; 206 . += PAGE_SIZE; 207#endif 208 209 reserved_pg_dir = .; 210 . += PAGE_SIZE; 211 212 swapper_pg_dir = .; 213 . += PAGE_SIZE; 214 215 . = ALIGN(SEGMENT_ALIGN); 216 __init_begin = .; 217 __inittext_begin = .; 218 219 INIT_TEXT_SECTION(8) 220 221 __exittext_begin = .; 222 .exit.text : { 223 EXIT_TEXT 224 } 225 __exittext_end = .; 226 227 . = ALIGN(4); 228 .altinstructions : { 229 __alt_instructions = .; 230 *(.altinstructions) 231 __alt_instructions_end = .; 232 } 233 234 . = ALIGN(SEGMENT_ALIGN); 235 __inittext_end = .; 236 __initdata_begin = .; 237 238 init_idmap_pg_dir = .; 239 . += INIT_IDMAP_DIR_SIZE; 240 init_idmap_pg_end = .; 241 242 .init.data : { 243 INIT_DATA 244 INIT_SETUP(16) 245 INIT_CALLS 246 CON_INITCALL 247 INIT_RAM_FS 248 *(.init.altinstructions .init.bss) /* from the EFI stub */ 249 } 250 .exit.data : { 251 EXIT_DATA 252 } 253 254 PERCPU_SECTION(L1_CACHE_BYTES) 255 HYPERVISOR_PERCPU_SECTION 256 257 HYPERVISOR_RELOC_SECTION 258 259 .rela.dyn : ALIGN(8) { 260 __rela_start = .; 261 *(.rela .rela*) 262 __rela_end = .; 263 } 264 265 .relr.dyn : ALIGN(8) { 266 __relr_start = .; 267 *(.relr.dyn) 268 __relr_end = .; 269 } 270 271 . = ALIGN(SEGMENT_ALIGN); 272 __initdata_end = .; 273 __init_end = .; 274 275 _data = .; 276 _sdata = .; 277 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 278 279 /* 280 * Data written with the MMU off but read with the MMU on requires 281 * cache lines to be invalidated, discarding up to a Cache Writeback 282 * Granule (CWG) of data from the cache. Keep the section that 283 * requires this type of maintenance to be in its own Cache Writeback 284 * Granule (CWG) area so the cache maintenance operations don't 285 * interfere with adjacent data. 286 */ 287 .mmuoff.data.write : ALIGN(SZ_2K) { 288 __mmuoff_data_start = .; 289 *(.mmuoff.data.write) 290 } 291 . = ALIGN(SZ_2K); 292 .mmuoff.data.read : { 293 *(.mmuoff.data.read) 294 __mmuoff_data_end = .; 295 } 296 297 PECOFF_EDATA_PADDING 298 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 299 _edata = .; 300 301 BSS_SECTION(SBSS_ALIGN, 0, 0) 302 303 . = ALIGN(PAGE_SIZE); 304 init_pg_dir = .; 305 . += INIT_DIR_SIZE; 306 init_pg_end = .; 307 308 . = ALIGN(SEGMENT_ALIGN); 309 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 310 _end = .; 311 312 STABS_DEBUG 313 DWARF_DEBUG 314 ELF_DETAILS 315 316 HEAD_SYMBOLS 317 318 /* 319 * Sections that should stay zero sized, which is safer to 320 * explicitly check instead of blindly discarding. 321 */ 322 .plt : { 323 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 324 } 325 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 326 327 .data.rel.ro : { *(.data.rel.ro) } 328 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 329} 330 331#include "image-vars.h" 332 333/* 334 * The HYP init code and ID map text can't be longer than a page each. The 335 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 336 * it should also not cross a page boundary. 337 */ 338ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 339 "HYP init code too big") 340ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 341 "ID map text too big or misaligned") 342#ifdef CONFIG_HIBERNATION 343ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K, 344 "Hibernate exit text is bigger than 4 KiB") 345#endif 346#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 347ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE, 348 "Entry trampoline text too big") 349#endif 350#ifdef CONFIG_KVM 351ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 352#endif 353/* 354 * If padding is applied before .head.text, virt<->phys conversions will fail. 355 */ 356ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 357 358ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET, 359 "RESERVED_SWAPPER_OFFSET is wrong!") 360 361#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 362ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET, 363 "TRAMP_SWAPPER_OFFSET is wrong!") 364#endif 365 366#ifdef CONFIG_KEXEC_CORE 367/* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */ 368ASSERT(__relocate_new_kernel_end - __relocate_new_kernel_start <= SZ_4K, 369 "kexec relocation code is bigger than 4 KiB") 370ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K, "KEXEC_CONTROL_PAGE_SIZE is broken") 371#endif 372