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_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 HYPERVISOR_EVENTS 79#define SBSS_ALIGN 0 80#endif 81 82#define RO_EXCEPTION_TABLE_ALIGN 8 83#define RUNTIME_DISCARD_EXIT 84 85#include <asm-generic/vmlinux.lds.h> 86#include <asm/cache.h> 87#include <asm/kernel-pgtable.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(SZ_4K); \ 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_UNMAP_KERNEL_AT_EL0 126#define TRAMP_TEXT \ 127 . = ALIGN(PAGE_SIZE); \ 128 __entry_tramp_text_start = .; \ 129 *(.entry.tramp.text) \ 130 . = ALIGN(PAGE_SIZE); \ 131 __entry_tramp_text_end = .; 132#else 133#define TRAMP_TEXT 134#endif 135 136#ifdef CONFIG_UNWIND_TABLES 137#define UNWIND_DATA_SECTIONS \ 138 .eh_frame : { \ 139 __eh_frame_start = .; \ 140 *(.eh_frame) \ 141 __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 } 176 177 . = KIMAGE_VADDR; 178 179 .head.text : { 180 _text = .; 181 HEAD_TEXT 182 } 183 .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */ 184 _stext = .; /* Text and read-only data */ 185 IRQENTRY_TEXT 186 SOFTIRQENTRY_TEXT 187 ENTRY_TEXT 188 TEXT_TEXT 189 SCHED_TEXT 190 CPUIDLE_TEXT 191 LOCK_TEXT 192 KPROBES_TEXT 193 HYPERVISOR_TEXT 194 IDMAP_TEXT 195 HIBERNATE_TEXT 196 TRAMP_TEXT 197 *(.fixup) 198 *(.gnu.warning) 199 . = ALIGN(16); 200 *(.got) /* Global offset table */ 201 } 202 203 /* 204 * Make sure that the .got.plt is either completely empty or it 205 * contains only the lazy dispatch entries. 206 */ 207 .got.plt : { *(.got.plt) } 208 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 209 "Unexpected GOT/PLT entries detected!") 210 211 . = ALIGN(SEGMENT_ALIGN); 212 _etext = .; /* End of text section */ 213 214 /* everything from this point to __init_begin will be marked RO NX */ 215 RO_DATA(PAGE_SIZE) 216 217 HYPERVISOR_RODATA_SECTIONS 218 219#ifdef CONFIG_TRACING 220 .rodata.hyp_events : { 221 __hyp_events_start = .; 222 *(_hyp_events) 223 __hyp_events_end = .; 224 . = ALIGN(PAGE_SIZE); 225 } 226#endif 227 228 idmap_pg_dir = .; 229 . += IDMAP_DIR_SIZE; 230 idmap_pg_end = .; 231 232#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 233 tramp_pg_dir = .; 234 . += PAGE_SIZE; 235#endif 236 237 reserved_pg_dir = .; 238 . += PAGE_SIZE; 239 240 swapper_pg_dir = .; 241 . += PAGE_SIZE; 242 243 . = ALIGN(SEGMENT_ALIGN); 244 __init_begin = .; 245 __inittext_begin = .; 246 247 INIT_TEXT_SECTION(8) 248 249 __exittext_begin = .; 250 .exit.text : { 251 EXIT_TEXT 252 } 253 __exittext_end = .; 254 255 . = ALIGN(4); 256 .altinstructions : { 257 __alt_instructions = .; 258 *(.altinstructions) 259 __alt_instructions_end = .; 260 } 261 262 UNWIND_DATA_SECTIONS 263 264 . = ALIGN(SEGMENT_ALIGN); 265 __inittext_end = .; 266 __initdata_begin = .; 267 268 .init.data : { 269 INIT_DATA 270 INIT_SETUP(16) 271 INIT_CALLS 272 CON_INITCALL 273 INIT_RAM_FS 274 *(.init.altinstructions .init.bss) /* from the EFI stub */ 275 } 276 .exit.data : { 277 EXIT_DATA 278 } 279 280 PERCPU_SECTION(L1_CACHE_BYTES) 281 HYPERVISOR_PERCPU_SECTION 282 283 HYPERVISOR_RELOC_SECTION 284 285 .rela.dyn : ALIGN(8) { 286 *(.rela .rela*) 287 } 288 289 __rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR); 290 __rela_size = SIZEOF(.rela.dyn); 291 292#ifdef CONFIG_RELR 293 .relr.dyn : ALIGN(8) { 294 *(.relr.dyn) 295 } 296 297 __relr_offset = ABSOLUTE(ADDR(.relr.dyn) - KIMAGE_VADDR); 298 __relr_size = SIZEOF(.relr.dyn); 299#endif 300 301 . = ALIGN(SEGMENT_ALIGN); 302 __initdata_end = .; 303 __init_end = .; 304 305 _data = .; 306 _sdata = .; 307 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 308 309 HYPERVISOR_DATA_SECTION 310 311 /* 312 * Data written with the MMU off but read with the MMU on requires 313 * cache lines to be invalidated, discarding up to a Cache Writeback 314 * Granule (CWG) of data from the cache. Keep the section that 315 * requires this type of maintenance to be in its own Cache Writeback 316 * Granule (CWG) area so the cache maintenance operations don't 317 * interfere with adjacent data. 318 */ 319 .mmuoff.data.write : ALIGN(SZ_2K) { 320 __mmuoff_data_start = .; 321 *(.mmuoff.data.write) 322 } 323 . = ALIGN(SZ_2K); 324 .mmuoff.data.read : { 325 *(.mmuoff.data.read) 326 __mmuoff_data_end = .; 327 } 328 329 PECOFF_EDATA_PADDING 330 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 331 _edata = .; 332 333 BSS_SECTION(SBSS_ALIGN, 0, 0) 334 335 . = ALIGN(PAGE_SIZE); 336 init_pg_dir = .; 337 . += INIT_DIR_SIZE; 338 init_pg_end = .; 339 340 . = ALIGN(SEGMENT_ALIGN); 341 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 342 _end = .; 343 344 STABS_DEBUG 345 DWARF_DEBUG 346 ELF_DETAILS 347 348 HEAD_SYMBOLS 349 350 /* 351 * Sections that should stay zero sized, which is safer to 352 * explicitly check instead of blindly discarding. 353 */ 354 .plt : { 355 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 356 } 357 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 358 359 .data.rel.ro : { *(.data.rel.ro) } 360 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 361} 362 363#include "image-vars.h" 364 365/* 366 * The HYP init code and ID map text can't be longer than a page each. The 367 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 368 * it should also not cross a page boundary. 369 */ 370ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 371 "HYP init code too big") 372ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 373 "ID map text too big or misaligned") 374#ifdef CONFIG_HIBERNATION 375ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1)) 376 <= SZ_4K, "Hibernate exit text too big or misaligned") 377#endif 378#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 379ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE, 380 "Entry trampoline text too big") 381#endif 382#ifdef CONFIG_KVM 383ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 384#endif 385/* 386 * If padding is applied before .head.text, virt<->phys conversions will fail. 387 */ 388ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 389 390ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET, 391 "RESERVED_SWAPPER_OFFSET is wrong!") 392 393#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 394ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET, 395 "TRAMP_SWAPPER_OFFSET is wrong!") 396#endif 397