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#ifdef CONFIG_UNWIND_TABLES 125#define UNWIND_DATA_SECTIONS \ 126 .eh_frame : { \ 127 __eh_frame_start = .; \ 128 *(.eh_frame) \ 129 __eh_frame_end = .; \ 130 } 131#else 132#define UNWIND_DATA_SECTIONS 133#endif 134 135/* 136 * The size of the PE/COFF section that covers the kernel image, which 137 * runs from _stext to _edata, must be a round multiple of the PE/COFF 138 * FileAlignment, which we set to its minimum value of 0x200. '_stext' 139 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 140 * boundary should be sufficient. 141 */ 142PECOFF_FILE_ALIGNMENT = 0x200; 143 144#ifdef CONFIG_EFI 145#define PECOFF_EDATA_PADDING \ 146 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 147#else 148#define PECOFF_EDATA_PADDING 149#endif 150 151SECTIONS 152{ 153 /* 154 * XXX: The linker does not define how output sections are 155 * assigned to input sections when there are multiple statements 156 * matching the same input section name. There is no documented 157 * order of matching. 158 */ 159 DISCARDS 160 /DISCARD/ : { 161 *(.interp .dynamic) 162 *(.dynsym .dynstr .hash .gnu.hash) 163 } 164 165 . = KIMAGE_VADDR; 166 167 .head.text : { 168 _text = .; 169 HEAD_TEXT 170 } 171 .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */ 172 _stext = .; /* Text and read-only data */ 173 IRQENTRY_TEXT 174 SOFTIRQENTRY_TEXT 175 ENTRY_TEXT 176 TEXT_TEXT 177 SCHED_TEXT 178 LOCK_TEXT 179 KPROBES_TEXT 180 HYPERVISOR_TEXT 181 IDMAP_TEXT 182 *(.gnu.warning) 183 . = ALIGN(16); 184 *(.got) /* Global offset table */ 185 } 186 187 /* 188 * Make sure that the .got.plt is either completely empty or it 189 * contains only the lazy dispatch entries. 190 */ 191 .got.plt : { *(.got.plt) } 192 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 193 "Unexpected GOT/PLT entries detected!") 194 195 . = ALIGN(SEGMENT_ALIGN); 196 _etext = .; /* End of text section */ 197 198 /* everything from this point to __init_begin will be marked RO NX */ 199 RO_DATA(PAGE_SIZE) 200 201 HYPERVISOR_DATA_SECTIONS 202 203 /* code sections that are never executed via the kernel mapping */ 204 .rodata.text : { 205 TRAMP_TEXT 206 HIBERNATE_TEXT 207 KEXEC_TEXT 208 . = ALIGN(PAGE_SIZE); 209 } 210 211 idmap_pg_dir = .; 212 . += PAGE_SIZE; 213 214#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 215 tramp_pg_dir = .; 216 . += PAGE_SIZE; 217#endif 218 219 reserved_pg_dir = .; 220 . += PAGE_SIZE; 221 222 swapper_pg_dir = .; 223 . += PAGE_SIZE; 224 225 . = ALIGN(SEGMENT_ALIGN); 226 __init_begin = .; 227 __inittext_begin = .; 228 229 INIT_TEXT_SECTION(8) 230 231 __exittext_begin = .; 232 .exit.text : { 233 EXIT_TEXT 234 } 235 __exittext_end = .; 236 237 . = ALIGN(4); 238 .altinstructions : { 239 __alt_instructions = .; 240 *(.altinstructions) 241 __alt_instructions_end = .; 242 } 243 244 UNWIND_DATA_SECTIONS 245 246 . = ALIGN(SEGMENT_ALIGN); 247 __inittext_end = .; 248 __initdata_begin = .; 249 250 init_idmap_pg_dir = .; 251 . += INIT_IDMAP_DIR_SIZE; 252 init_idmap_pg_end = .; 253 254 .init.data : { 255 INIT_DATA 256 INIT_SETUP(16) 257 INIT_CALLS 258 CON_INITCALL 259 INIT_RAM_FS 260 *(.init.altinstructions .init.bss) /* from the EFI stub */ 261 } 262 .exit.data : { 263 EXIT_DATA 264 } 265 266 PERCPU_SECTION(L1_CACHE_BYTES) 267 HYPERVISOR_PERCPU_SECTION 268 269 HYPERVISOR_RELOC_SECTION 270 271 .rela.dyn : ALIGN(8) { 272 __rela_start = .; 273 *(.rela .rela*) 274 __rela_end = .; 275 } 276 277 .relr.dyn : ALIGN(8) { 278 __relr_start = .; 279 *(.relr.dyn) 280 __relr_end = .; 281 } 282 283 . = ALIGN(SEGMENT_ALIGN); 284 __initdata_end = .; 285 __init_end = .; 286 287 _data = .; 288 _sdata = .; 289 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 290 291 /* 292 * Data written with the MMU off but read with the MMU on requires 293 * cache lines to be invalidated, discarding up to a Cache Writeback 294 * Granule (CWG) of data from the cache. Keep the section that 295 * requires this type of maintenance to be in its own Cache Writeback 296 * Granule (CWG) area so the cache maintenance operations don't 297 * interfere with adjacent data. 298 */ 299 .mmuoff.data.write : ALIGN(SZ_2K) { 300 __mmuoff_data_start = .; 301 *(.mmuoff.data.write) 302 } 303 . = ALIGN(SZ_2K); 304 .mmuoff.data.read : { 305 *(.mmuoff.data.read) 306 __mmuoff_data_end = .; 307 } 308 309 PECOFF_EDATA_PADDING 310 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 311 _edata = .; 312 313 BSS_SECTION(SBSS_ALIGN, 0, 0) 314 315 . = ALIGN(PAGE_SIZE); 316 init_pg_dir = .; 317 . += INIT_DIR_SIZE; 318 init_pg_end = .; 319 320 . = ALIGN(SEGMENT_ALIGN); 321 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 322 _end = .; 323 324 STABS_DEBUG 325 DWARF_DEBUG 326 ELF_DETAILS 327 328 HEAD_SYMBOLS 329 330 /* 331 * Sections that should stay zero sized, which is safer to 332 * explicitly check instead of blindly discarding. 333 */ 334 .plt : { 335 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 336 } 337 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 338 339 .data.rel.ro : { *(.data.rel.ro) } 340 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 341} 342 343#include "image-vars.h" 344 345/* 346 * The HYP init code and ID map text can't be longer than a page each. The 347 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 348 * it should also not cross a page boundary. 349 */ 350ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 351 "HYP init code too big") 352ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 353 "ID map text too big or misaligned") 354#ifdef CONFIG_HIBERNATION 355ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K, 356 "Hibernate exit text is bigger than 4 KiB") 357#endif 358#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 359ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE, 360 "Entry trampoline text too big") 361#endif 362#ifdef CONFIG_KVM 363ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 364#endif 365/* 366 * If padding is applied before .head.text, virt<->phys conversions will fail. 367 */ 368ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 369 370ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET, 371 "RESERVED_SWAPPER_OFFSET is wrong!") 372 373#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 374ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET, 375 "TRAMP_SWAPPER_OFFSET is wrong!") 376#endif 377 378#ifdef CONFIG_KEXEC_CORE 379/* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */ 380ASSERT(__relocate_new_kernel_end - __relocate_new_kernel_start <= SZ_4K, 381 "kexec relocation code is bigger than 4 KiB") 382ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K, "KEXEC_CONTROL_PAGE_SIZE is broken") 383#endif 384