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#ifdef CONFIG_NVHE_EL2_TRACING 17#define HYPERVISOR_EVENT_IDS \ 18 . = ALIGN(PAGE_SIZE); \ 19 __hyp_event_ids_start = .; \ 20 *(HYP_SECTION_NAME(.event_ids)) \ 21 __hyp_event_ids_end = .; 22#else 23#define HYPERVISOR_EVENT_IDS 24#endif 25 26#define HYPERVISOR_RODATA_SECTIONS \ 27 HYP_SECTION_NAME(.rodata) : { \ 28 . = ALIGN(PAGE_SIZE); \ 29 __hyp_rodata_start = .; \ 30 *(HYP_SECTION_NAME(.data..ro_after_init)) \ 31 *(HYP_SECTION_NAME(.rodata)) \ 32 HYPERVISOR_EVENT_IDS \ 33 . = ALIGN(PAGE_SIZE); \ 34 __hyp_rodata_end = .; \ 35 } 36 37#define HYPERVISOR_DATA_SECTION \ 38 HYP_SECTION_NAME(.data) : { \ 39 . = ALIGN(PAGE_SIZE); \ 40 __hyp_data_start = .; \ 41 *(HYP_SECTION_NAME(.data)) \ 42 . = ALIGN(PAGE_SIZE); \ 43 __hyp_data_end = .; \ 44 } 45 46#define HYPERVISOR_PERCPU_SECTION \ 47 . = ALIGN(PAGE_SIZE); \ 48 HYP_SECTION_NAME(.data..percpu) : { \ 49 *(HYP_SECTION_NAME(.data..percpu)) \ 50 } 51 52#define HYPERVISOR_RELOC_SECTION \ 53 .hyp.reloc : ALIGN(4) { \ 54 __hyp_reloc_begin = .; \ 55 *(.hyp.reloc) \ 56 __hyp_reloc_end = .; \ 57 } 58 59#define BSS_FIRST_SECTIONS \ 60 __hyp_bss_start = .; \ 61 *(HYP_SECTION_NAME(.bss)) \ 62 . = ALIGN(PAGE_SIZE); \ 63 __hyp_bss_end = .; 64 65/* 66 * We require that __hyp_bss_start and __bss_start are aligned, and enforce it 67 * with an assertion. But the BSS_SECTION macro places an empty .sbss section 68 * between them, which can in some cases cause the linker to misalign them. To 69 * work around the issue, force a page alignment for __bss_start. 70 */ 71#define SBSS_ALIGN PAGE_SIZE 72#else /* CONFIG_KVM */ 73#define HYPERVISOR_EXTABLE 74#define HYPERVISOR_RODATA_SECTIONS 75#define HYPERVISOR_DATA_SECTION 76#define HYPERVISOR_PERCPU_SECTION 77#define HYPERVISOR_RELOC_SECTION 78#define SBSS_ALIGN 0 79#endif 80 81#define RO_EXCEPTION_TABLE_ALIGN 4 82#define RUNTIME_DISCARD_EXIT 83 84#include <asm-generic/vmlinux.lds.h> 85#include <asm/cache.h> 86#include <asm/kernel-pgtable.h> 87#include <asm/kexec.h> 88#include <asm/memory.h> 89#include <asm/page.h> 90 91#include "image.h" 92 93OUTPUT_ARCH(aarch64) 94ENTRY(_text) 95 96jiffies = jiffies_64; 97 98#define HYPERVISOR_TEXT \ 99 . = ALIGN(PAGE_SIZE); \ 100 __hyp_idmap_text_start = .; \ 101 *(.hyp.idmap.text) \ 102 __hyp_idmap_text_end = .; \ 103 __hyp_text_start = .; \ 104 *(.hyp.text) \ 105 HYPERVISOR_EXTABLE \ 106 . = ALIGN(PAGE_SIZE); \ 107 __hyp_text_end = .; 108 109#define IDMAP_TEXT \ 110 . = ALIGN(SZ_4K); \ 111 __idmap_text_start = .; \ 112 *(.idmap.text) \ 113 __idmap_text_end = .; 114 115#ifdef CONFIG_HIBERNATION 116#define HIBERNATE_TEXT \ 117 ALIGN_FUNCTION(); \ 118 __hibernate_exit_text_start = .; \ 119 *(.hibernate_exit.text) \ 120 __hibernate_exit_text_end = .; 121#else 122#define HIBERNATE_TEXT 123#endif 124 125#ifdef CONFIG_KEXEC_CORE 126#define KEXEC_TEXT \ 127 ALIGN_FUNCTION(); \ 128 __relocate_new_kernel_start = .; \ 129 *(.kexec_relocate.text) \ 130 __relocate_new_kernel_end = .; 131#else 132#define KEXEC_TEXT 133#endif 134 135#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 136#define TRAMP_TEXT \ 137 . = ALIGN(PAGE_SIZE); \ 138 __entry_tramp_text_start = .; \ 139 *(.entry.tramp.text) \ 140 . = ALIGN(PAGE_SIZE); \ 141 __entry_tramp_text_end = .; \ 142 *(.entry.tramp.rodata) 143#else 144#define TRAMP_TEXT 145#endif 146 147#ifdef CONFIG_UNWIND_TABLES 148#define UNWIND_DATA_SECTIONS \ 149 .eh_frame : { \ 150 __pi___eh_frame_start = .; \ 151 *(.eh_frame) \ 152 __pi___eh_frame_end = .; \ 153 } 154#else 155#define UNWIND_DATA_SECTIONS 156#endif 157 158/* 159 * The size of the PE/COFF section that covers the kernel image, which 160 * runs from _stext to _edata, must be a round multiple of the PE/COFF 161 * FileAlignment, which we set to its minimum value of 0x200. '_stext' 162 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 163 * boundary should be sufficient. 164 */ 165PECOFF_FILE_ALIGNMENT = 0x200; 166 167#ifdef CONFIG_EFI 168#define PECOFF_EDATA_PADDING \ 169 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 170#else 171#define PECOFF_EDATA_PADDING 172#endif 173 174SECTIONS 175{ 176 /* 177 * XXX: The linker does not define how output sections are 178 * assigned to input sections when there are multiple statements 179 * matching the same input section name. There is no documented 180 * order of matching. 181 */ 182 DISCARDS 183 /DISCARD/ : { 184 *(.interp .dynamic) 185 *(.dynsym .dynstr .hash .gnu.hash) 186 *(.ARM.attributes) 187 } 188 189 . = KIMAGE_VADDR; 190 191 .head.text : { 192 _text = .; 193 HEAD_TEXT 194 } 195 .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */ 196 _stext = .; /* Text and read-only data */ 197 IRQENTRY_TEXT 198 SOFTIRQENTRY_TEXT 199 ENTRY_TEXT 200 TEXT_TEXT 201 SCHED_TEXT 202 LOCK_TEXT 203 KPROBES_TEXT 204 HYPERVISOR_TEXT 205 *(.gnu.warning) 206 } 207 208 . = ALIGN(SEGMENT_ALIGN); 209 _etext = .; /* End of text section */ 210 211 /* everything from this point to __init_begin will be marked RO NX */ 212 RO_DATA(PAGE_SIZE) 213 214 HYPERVISOR_RODATA_SECTIONS 215 216 .got : { *(.got) } 217 /* 218 * Make sure that the .got.plt is either completely empty or it 219 * contains only the lazy dispatch entries. 220 */ 221 .got.plt : { *(.got.plt) } 222 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 223 "Unexpected GOT/PLT entries detected!") 224 225 /* code sections that are never executed via the kernel mapping */ 226 .rodata.text : { 227 TRAMP_TEXT 228 HIBERNATE_TEXT 229 KEXEC_TEXT 230 IDMAP_TEXT 231 . = ALIGN(PAGE_SIZE); 232 } 233 234 idmap_pg_dir = .; 235 . += PAGE_SIZE; 236 237#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 238 tramp_pg_dir = .; 239 . += PAGE_SIZE; 240#endif 241 242 reserved_pg_dir = .; 243 . += PAGE_SIZE; 244 245 swapper_pg_dir = .; 246 . += PAGE_SIZE; 247 248 . = ALIGN(SEGMENT_ALIGN); 249 __init_begin = .; 250 __inittext_begin = .; 251 252 INIT_TEXT_SECTION(8) 253 254 __exittext_begin = .; 255 .exit.text : { 256 EXIT_TEXT 257 } 258 __exittext_end = .; 259 260 . = ALIGN(4); 261 .altinstructions : { 262 __alt_instructions = .; 263 *(.altinstructions) 264 __alt_instructions_end = .; 265 } 266 267 UNWIND_DATA_SECTIONS 268 269 . = ALIGN(SEGMENT_ALIGN); 270 __inittext_end = .; 271 __initdata_begin = .; 272 273 __pi_init_idmap_pg_dir = .; 274 . += INIT_IDMAP_DIR_SIZE; 275 __pi_init_idmap_pg_end = .; 276 277 .init.data : { 278 INIT_DATA 279 INIT_SETUP(16) 280 INIT_CALLS 281 CON_INITCALL 282 INIT_RAM_FS 283 *(.init.altinstructions .init.bss) /* from the EFI stub */ 284 } 285 .exit.data : { 286 EXIT_DATA 287 } 288 289 RUNTIME_CONST_VARIABLES 290 291 PERCPU_SECTION(L1_CACHE_BYTES) 292 HYPERVISOR_PERCPU_SECTION 293 294 HYPERVISOR_RELOC_SECTION 295 296 .rela.dyn : ALIGN(8) { 297 __pi_rela_start = .; 298 *(.rela .rela*) 299 __pi_rela_end = .; 300 } 301 302 .relr.dyn : ALIGN(8) { 303 __pi_relr_start = .; 304 *(.relr.dyn) 305 __pi_relr_end = .; 306 } 307 308 . = ALIGN(SEGMENT_ALIGN); 309 __initdata_end = .; 310 __init_end = .; 311 312 .data.rel.ro : { *(.data.rel.ro) } 313 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 314 315 _data = .; 316 _sdata = .; 317 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 318 319 HYPERVISOR_DATA_SECTION 320 321#ifdef CONFIG_NVHE_EL2_TRACING 322 .data.hyp_events : { 323 __hyp_events_start = .; 324 *(SORT(_hyp_events.*)) 325 __hyp_events_end = .; 326 } 327#endif 328 /* 329 * Data written with the MMU off but read with the MMU on requires 330 * cache lines to be invalidated, discarding up to a Cache Writeback 331 * Granule (CWG) of data from the cache. Keep the section that 332 * requires this type of maintenance to be in its own Cache Writeback 333 * Granule (CWG) area so the cache maintenance operations don't 334 * interfere with adjacent data. 335 */ 336 .mmuoff.data.write : ALIGN(SZ_2K) { 337 __mmuoff_data_start = .; 338 *(.mmuoff.data.write) 339 } 340 . = ALIGN(SZ_2K); 341 .mmuoff.data.read : { 342 *(.mmuoff.data.read) 343 __mmuoff_data_end = .; 344 } 345 346 PECOFF_EDATA_PADDING 347 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 348 _edata = .; 349 350 /* start of zero-init region */ 351 BSS_SECTION(SBSS_ALIGN, 0, 0) 352 __pi___bss_start = __bss_start; 353 354 . = ALIGN(PAGE_SIZE); 355 __pi_init_pg_dir = .; 356 . += INIT_DIR_SIZE; 357 __pi_init_pg_end = .; 358 /* end of zero-init region */ 359 360 . += SZ_4K; /* stack for the early C runtime */ 361 early_init_stack = .; 362 363 . = ALIGN(SEGMENT_ALIGN); 364 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 365 _end = .; 366 __pi__end = .; 367 368 STABS_DEBUG 369 DWARF_DEBUG 370 MODINFO 371 ELF_DETAILS 372 373 HEAD_SYMBOLS 374 375 /* 376 * Sections that should stay zero sized, which is safer to 377 * explicitly check instead of blindly discarding. 378 */ 379 .plt : { 380 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 381 } 382 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 383} 384 385#include "image-vars.h" 386 387/* 388 * The HYP init code and ID map text can't be longer than a page each. The 389 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 390 * it should also not cross a page boundary. 391 */ 392ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 393 "HYP init code too big") 394ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 395 "ID map text too big or misaligned") 396#ifdef CONFIG_HIBERNATION 397ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K, 398 "Hibernate exit text is bigger than 4 KiB") 399ASSERT(__hibernate_exit_text_start == swsusp_arch_suspend_exit, 400 "Hibernate exit text does not start with swsusp_arch_suspend_exit") 401#endif 402#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 403ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE, 404 "Entry trampoline text too big") 405#endif 406#ifdef CONFIG_KVM 407ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 408#endif 409/* 410 * If padding is applied before .head.text, virt<->phys conversions will fail. 411 */ 412ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 413 414ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET, 415 "RESERVED_SWAPPER_OFFSET is wrong!") 416 417#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 418ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET, 419 "TRAMP_SWAPPER_OFFSET is wrong!") 420#endif 421 422#ifdef CONFIG_KEXEC_CORE 423/* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */ 424ASSERT(__relocate_new_kernel_end - __relocate_new_kernel_start <= SZ_4K, 425 "kexec relocation code is bigger than 4 KiB") 426ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K, "KEXEC_CONTROL_PAGE_SIZE is broken") 427ASSERT(__relocate_new_kernel_start == arm64_relocate_new_kernel, 428 "kexec control page does not start with arm64_relocate_new_kernel") 429#endif 430