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_RODATA_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_DATA_SECTION \ 27 HYP_SECTION_NAME(.data) : { \ 28 . = ALIGN(PAGE_SIZE); \ 29 __hyp_data_start = .; \ 30 *(HYP_SECTION_NAME(.data)) \ 31 . = ALIGN(PAGE_SIZE); \ 32 __hyp_data_end = .; \ 33 } 34 35#define HYPERVISOR_PERCPU_SECTION \ 36 . = ALIGN(PAGE_SIZE); \ 37 HYP_SECTION_NAME(.data..percpu) : { \ 38 *(HYP_SECTION_NAME(.data..percpu)) \ 39 } 40 41#define HYPERVISOR_RELOC_SECTION \ 42 .hyp.reloc : ALIGN(4) { \ 43 __hyp_reloc_begin = .; \ 44 *(.hyp.reloc) \ 45 __hyp_reloc_end = .; \ 46 } 47 48#define BSS_FIRST_SECTIONS \ 49 __hyp_bss_start = .; \ 50 *(HYP_SECTION_NAME(.bss)) \ 51 . = ALIGN(PAGE_SIZE); \ 52 __hyp_bss_end = .; 53 54/* 55 * We require that __hyp_bss_start and __bss_start are aligned, and enforce it 56 * with an assertion. But the BSS_SECTION macro places an empty .sbss section 57 * between them, which can in some cases cause the linker to misalign them. To 58 * work around the issue, force a page alignment for __bss_start. 59 */ 60#define SBSS_ALIGN PAGE_SIZE 61#else /* CONFIG_KVM */ 62#define HYPERVISOR_EXTABLE 63#define HYPERVISOR_RODATA_SECTIONS 64#define HYPERVISOR_DATA_SECTION 65#define HYPERVISOR_PERCPU_SECTION 66#define HYPERVISOR_RELOC_SECTION 67#define SBSS_ALIGN 0 68#endif 69 70#define RO_EXCEPTION_TABLE_ALIGN 4 71#define RUNTIME_DISCARD_EXIT 72 73#include <asm-generic/vmlinux.lds.h> 74#include <asm/cache.h> 75#include <asm/kernel-pgtable.h> 76#include <asm/kexec.h> 77#include <asm/memory.h> 78#include <asm/page.h> 79 80#include "image.h" 81 82OUTPUT_ARCH(aarch64) 83ENTRY(_text) 84 85jiffies = jiffies_64; 86 87#define HYPERVISOR_TEXT \ 88 . = ALIGN(PAGE_SIZE); \ 89 __hyp_idmap_text_start = .; \ 90 *(.hyp.idmap.text) \ 91 __hyp_idmap_text_end = .; \ 92 __hyp_text_start = .; \ 93 *(.hyp.text) \ 94 HYPERVISOR_EXTABLE \ 95 . = ALIGN(PAGE_SIZE); \ 96 __hyp_text_end = .; 97 98#define IDMAP_TEXT \ 99 . = ALIGN(SZ_4K); \ 100 __idmap_text_start = .; \ 101 *(.idmap.text) \ 102 __idmap_text_end = .; 103 104#ifdef CONFIG_HIBERNATION 105#define HIBERNATE_TEXT \ 106 ALIGN_FUNCTION(); \ 107 __hibernate_exit_text_start = .; \ 108 *(.hibernate_exit.text) \ 109 __hibernate_exit_text_end = .; 110#else 111#define HIBERNATE_TEXT 112#endif 113 114#ifdef CONFIG_KEXEC_CORE 115#define KEXEC_TEXT \ 116 ALIGN_FUNCTION(); \ 117 __relocate_new_kernel_start = .; \ 118 *(.kexec_relocate.text) \ 119 __relocate_new_kernel_end = .; 120#else 121#define KEXEC_TEXT 122#endif 123 124#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 125#define TRAMP_TEXT \ 126 . = ALIGN(PAGE_SIZE); \ 127 __entry_tramp_text_start = .; \ 128 *(.entry.tramp.text) \ 129 . = ALIGN(PAGE_SIZE); \ 130 __entry_tramp_text_end = .; \ 131 *(.entry.tramp.rodata) 132#else 133#define TRAMP_TEXT 134#endif 135 136#ifdef CONFIG_UNWIND_TABLES 137#define UNWIND_DATA_SECTIONS \ 138 .eh_frame : { \ 139 __pi___eh_frame_start = .; \ 140 *(.eh_frame) \ 141 __pi___eh_frame_end = .; \ 142 } 143#else 144#define UNWIND_DATA_SECTIONS 145#endif 146 147/* 148 * The size of the PE/COFF section that covers the kernel image, which 149 * runs from _stext to _edata, must be a round multiple of the PE/COFF 150 * FileAlignment, which we set to its minimum value of 0x200. '_stext' 151 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 152 * boundary should be sufficient. 153 */ 154PECOFF_FILE_ALIGNMENT = 0x200; 155 156#ifdef CONFIG_EFI 157#define PECOFF_EDATA_PADDING \ 158 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 159#else 160#define PECOFF_EDATA_PADDING 161#endif 162 163SECTIONS 164{ 165 /* 166 * XXX: The linker does not define how output sections are 167 * assigned to input sections when there are multiple statements 168 * matching the same input section name. There is no documented 169 * order of matching. 170 */ 171 DISCARDS 172 /DISCARD/ : { 173 *(.interp .dynamic) 174 *(.dynsym .dynstr .hash .gnu.hash) 175 *(.ARM.attributes) 176 } 177 178 . = KIMAGE_VADDR; 179 180 .head.text : { 181 _text = .; 182 HEAD_TEXT 183 } 184 .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */ 185 _stext = .; /* Text and read-only data */ 186 IRQENTRY_TEXT 187 SOFTIRQENTRY_TEXT 188 ENTRY_TEXT 189 TEXT_TEXT 190 SCHED_TEXT 191 LOCK_TEXT 192 KPROBES_TEXT 193 HYPERVISOR_TEXT 194 *(.gnu.warning) 195 } 196 197 . = ALIGN(SEGMENT_ALIGN); 198 _etext = .; /* End of text section */ 199 200 /* everything from this point to __init_begin will be marked RO NX */ 201 RO_DATA(PAGE_SIZE) 202 203 HYPERVISOR_RODATA_SECTIONS 204 205 .got : { *(.got) } 206 /* 207 * Make sure that the .got.plt is either completely empty or it 208 * contains only the lazy dispatch entries. 209 */ 210 .got.plt : { *(.got.plt) } 211 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 212 "Unexpected GOT/PLT entries detected!") 213 214 /* code sections that are never executed via the kernel mapping */ 215 .rodata.text : { 216 TRAMP_TEXT 217 HIBERNATE_TEXT 218 KEXEC_TEXT 219 IDMAP_TEXT 220 . = ALIGN(PAGE_SIZE); 221 } 222 223 idmap_pg_dir = .; 224 . += PAGE_SIZE; 225 226#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 227 tramp_pg_dir = .; 228 . += PAGE_SIZE; 229#endif 230 231 reserved_pg_dir = .; 232 . += PAGE_SIZE; 233 234 swapper_pg_dir = .; 235 . += PAGE_SIZE; 236 237 . = ALIGN(SEGMENT_ALIGN); 238 __init_begin = .; 239 __inittext_begin = .; 240 241 INIT_TEXT_SECTION(8) 242 243 __exittext_begin = .; 244 .exit.text : { 245 EXIT_TEXT 246 } 247 __exittext_end = .; 248 249 . = ALIGN(4); 250 .altinstructions : { 251 __alt_instructions = .; 252 *(.altinstructions) 253 __alt_instructions_end = .; 254 } 255 256 UNWIND_DATA_SECTIONS 257 258 . = ALIGN(SEGMENT_ALIGN); 259 __inittext_end = .; 260 __initdata_begin = .; 261 262 __pi_init_idmap_pg_dir = .; 263 . += INIT_IDMAP_DIR_SIZE; 264 __pi_init_idmap_pg_end = .; 265 266 .init.data : { 267 INIT_DATA 268 INIT_SETUP(16) 269 INIT_CALLS 270 CON_INITCALL 271 INIT_RAM_FS 272 *(.init.altinstructions .init.bss) /* from the EFI stub */ 273 } 274 .exit.data : { 275 EXIT_DATA 276 } 277 278 RUNTIME_CONST_VARIABLES 279 280 PERCPU_SECTION(L1_CACHE_BYTES) 281 HYPERVISOR_PERCPU_SECTION 282 283 HYPERVISOR_RELOC_SECTION 284 285 .rela.dyn : ALIGN(8) { 286 __pi_rela_start = .; 287 *(.rela .rela*) 288 __pi_rela_end = .; 289 } 290 291 .relr.dyn : ALIGN(8) { 292 __pi_relr_start = .; 293 *(.relr.dyn) 294 __pi_relr_end = .; 295 } 296 297 . = ALIGN(SEGMENT_ALIGN); 298 __initdata_end = .; 299 __init_end = .; 300 301 .data.rel.ro : { *(.data.rel.ro) } 302 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 303 304 _data = .; 305 _sdata = .; 306 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 307 308 HYPERVISOR_DATA_SECTION 309 310 /* 311 * Data written with the MMU off but read with the MMU on requires 312 * cache lines to be invalidated, discarding up to a Cache Writeback 313 * Granule (CWG) of data from the cache. Keep the section that 314 * requires this type of maintenance to be in its own Cache Writeback 315 * Granule (CWG) area so the cache maintenance operations don't 316 * interfere with adjacent data. 317 */ 318 .mmuoff.data.write : ALIGN(SZ_2K) { 319 __mmuoff_data_start = .; 320 *(.mmuoff.data.write) 321 } 322 . = ALIGN(SZ_2K); 323 .mmuoff.data.read : { 324 *(.mmuoff.data.read) 325 __mmuoff_data_end = .; 326 } 327 328 PECOFF_EDATA_PADDING 329 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 330 _edata = .; 331 332 /* start of zero-init region */ 333 BSS_SECTION(SBSS_ALIGN, 0, 0) 334 __pi___bss_start = __bss_start; 335 336 . = ALIGN(PAGE_SIZE); 337 __pi_init_pg_dir = .; 338 . += INIT_DIR_SIZE; 339 __pi_init_pg_end = .; 340 /* end of zero-init region */ 341 342 . += SZ_4K; /* stack for the early C runtime */ 343 early_init_stack = .; 344 345 . = ALIGN(SEGMENT_ALIGN); 346 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 347 _end = .; 348 __pi__end = .; 349 350 STABS_DEBUG 351 DWARF_DEBUG 352 ELF_DETAILS 353 354 HEAD_SYMBOLS 355 356 /* 357 * Sections that should stay zero sized, which is safer to 358 * explicitly check instead of blindly discarding. 359 */ 360 .plt : { 361 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 362 } 363 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 364} 365 366#include "image-vars.h" 367 368/* 369 * The HYP init code and ID map text can't be longer than a page each. The 370 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 371 * it should also not cross a page boundary. 372 */ 373ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 374 "HYP init code too big") 375ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 376 "ID map text too big or misaligned") 377#ifdef CONFIG_HIBERNATION 378ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K, 379 "Hibernate exit text is bigger than 4 KiB") 380ASSERT(__hibernate_exit_text_start == swsusp_arch_suspend_exit, 381 "Hibernate exit text does not start with swsusp_arch_suspend_exit") 382#endif 383#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 384ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE, 385 "Entry trampoline text too big") 386#endif 387#ifdef CONFIG_KVM 388ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 389#endif 390/* 391 * If padding is applied before .head.text, virt<->phys conversions will fail. 392 */ 393ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 394 395ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET, 396 "RESERVED_SWAPPER_OFFSET is wrong!") 397 398#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 399ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET, 400 "TRAMP_SWAPPER_OFFSET is wrong!") 401#endif 402 403#ifdef CONFIG_KEXEC_CORE 404/* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */ 405ASSERT(__relocate_new_kernel_end - __relocate_new_kernel_start <= SZ_4K, 406 "kexec relocation code is bigger than 4 KiB") 407ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K, "KEXEC_CONTROL_PAGE_SIZE is broken") 408ASSERT(__relocate_new_kernel_start == arm64_relocate_new_kernel, 409 "kexec control page does not start with arm64_relocate_new_kernel") 410#endif 411