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 ALIGN_FUNCTION(); \ 97 __hibernate_exit_text_start = .; \ 98 *(.hibernate_exit.text) \ 99 __hibernate_exit_text_end = .; 100#else 101#define HIBERNATE_TEXT 102#endif 103 104#ifdef CONFIG_KEXEC_CORE 105#define KEXEC_TEXT \ 106 ALIGN_FUNCTION(); \ 107 __relocate_new_kernel_start = .; \ 108 *(.kexec_relocate.text) \ 109 __relocate_new_kernel_end = .; 110#else 111#define KEXEC_TEXT 112#endif 113 114#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 115#define TRAMP_TEXT \ 116 . = ALIGN(PAGE_SIZE); \ 117 __entry_tramp_text_start = .; \ 118 *(.entry.tramp.text) \ 119 . = ALIGN(PAGE_SIZE); \ 120 __entry_tramp_text_end = .; \ 121 *(.entry.tramp.rodata) 122#else 123#define TRAMP_TEXT 124#endif 125 126#ifdef CONFIG_UNWIND_TABLES 127#define UNWIND_DATA_SECTIONS \ 128 .eh_frame : { \ 129 __pi___eh_frame_start = .; \ 130 *(.eh_frame) \ 131 __pi___eh_frame_end = .; \ 132 } 133#else 134#define UNWIND_DATA_SECTIONS 135#endif 136 137/* 138 * The size of the PE/COFF section that covers the kernel image, which 139 * runs from _stext to _edata, must be a round multiple of the PE/COFF 140 * FileAlignment, which we set to its minimum value of 0x200. '_stext' 141 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 142 * boundary should be sufficient. 143 */ 144PECOFF_FILE_ALIGNMENT = 0x200; 145 146#ifdef CONFIG_EFI 147#define PECOFF_EDATA_PADDING \ 148 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 149#else 150#define PECOFF_EDATA_PADDING 151#endif 152 153SECTIONS 154{ 155 /* 156 * XXX: The linker does not define how output sections are 157 * assigned to input sections when there are multiple statements 158 * matching the same input section name. There is no documented 159 * order of matching. 160 */ 161 DISCARDS 162 /DISCARD/ : { 163 *(.interp .dynamic) 164 *(.dynsym .dynstr .hash .gnu.hash) 165 } 166 167 . = KIMAGE_VADDR; 168 169 .head.text : { 170 _text = .; 171 HEAD_TEXT 172 } 173 .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */ 174 _stext = .; /* Text and read-only data */ 175 IRQENTRY_TEXT 176 SOFTIRQENTRY_TEXT 177 ENTRY_TEXT 178 TEXT_TEXT 179 SCHED_TEXT 180 LOCK_TEXT 181 KPROBES_TEXT 182 HYPERVISOR_TEXT 183 *(.gnu.warning) 184 } 185 186 . = ALIGN(SEGMENT_ALIGN); 187 _etext = .; /* End of text section */ 188 189 /* everything from this point to __init_begin will be marked RO NX */ 190 RO_DATA(PAGE_SIZE) 191 192 HYPERVISOR_DATA_SECTIONS 193 194 .got : { *(.got) } 195 /* 196 * Make sure that the .got.plt is either completely empty or it 197 * contains only the lazy dispatch entries. 198 */ 199 .got.plt : { *(.got.plt) } 200 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 201 "Unexpected GOT/PLT entries detected!") 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 IDMAP_TEXT 209 . = ALIGN(PAGE_SIZE); 210 } 211 212 idmap_pg_dir = .; 213 . += PAGE_SIZE; 214 215#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 216 tramp_pg_dir = .; 217 . += PAGE_SIZE; 218#endif 219 220 reserved_pg_dir = .; 221 . += PAGE_SIZE; 222 223 swapper_pg_dir = .; 224 . += PAGE_SIZE; 225 226 . = ALIGN(SEGMENT_ALIGN); 227 __init_begin = .; 228 __inittext_begin = .; 229 230 INIT_TEXT_SECTION(8) 231 232 __exittext_begin = .; 233 .exit.text : { 234 EXIT_TEXT 235 } 236 __exittext_end = .; 237 238 . = ALIGN(4); 239 .altinstructions : { 240 __alt_instructions = .; 241 *(.altinstructions) 242 __alt_instructions_end = .; 243 } 244 245 UNWIND_DATA_SECTIONS 246 247 . = ALIGN(SEGMENT_ALIGN); 248 __inittext_end = .; 249 __initdata_begin = .; 250 251 init_idmap_pg_dir = .; 252 . += INIT_IDMAP_DIR_SIZE; 253 init_idmap_pg_end = .; 254 255 .init.data : { 256 INIT_DATA 257 INIT_SETUP(16) 258 INIT_CALLS 259 CON_INITCALL 260 INIT_RAM_FS 261 *(.init.altinstructions .init.bss) /* from the EFI stub */ 262 } 263 .exit.data : { 264 EXIT_DATA 265 } 266 267 PERCPU_SECTION(L1_CACHE_BYTES) 268 HYPERVISOR_PERCPU_SECTION 269 270 HYPERVISOR_RELOC_SECTION 271 272 .rela.dyn : ALIGN(8) { 273 __pi_rela_start = .; 274 *(.rela .rela*) 275 __pi_rela_end = .; 276 } 277 278 .relr.dyn : ALIGN(8) { 279 __pi_relr_start = .; 280 *(.relr.dyn) 281 __pi_relr_end = .; 282 } 283 284 . = ALIGN(SEGMENT_ALIGN); 285 __initdata_end = .; 286 __init_end = .; 287 288 _data = .; 289 _sdata = .; 290 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 291 292 /* 293 * Data written with the MMU off but read with the MMU on requires 294 * cache lines to be invalidated, discarding up to a Cache Writeback 295 * Granule (CWG) of data from the cache. Keep the section that 296 * requires this type of maintenance to be in its own Cache Writeback 297 * Granule (CWG) area so the cache maintenance operations don't 298 * interfere with adjacent data. 299 */ 300 .mmuoff.data.write : ALIGN(SZ_2K) { 301 __mmuoff_data_start = .; 302 *(.mmuoff.data.write) 303 } 304 . = ALIGN(SZ_2K); 305 .mmuoff.data.read : { 306 *(.mmuoff.data.read) 307 __mmuoff_data_end = .; 308 } 309 310 PECOFF_EDATA_PADDING 311 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 312 _edata = .; 313 314 /* start of zero-init region */ 315 BSS_SECTION(SBSS_ALIGN, 0, 0) 316 317 . = ALIGN(PAGE_SIZE); 318 init_pg_dir = .; 319 . += INIT_DIR_SIZE; 320 init_pg_end = .; 321 /* end of zero-init region */ 322 323 . += SZ_4K; /* stack for the early C runtime */ 324 early_init_stack = .; 325 326 . = ALIGN(SEGMENT_ALIGN); 327 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 328 _end = .; 329 330 STABS_DEBUG 331 DWARF_DEBUG 332 ELF_DETAILS 333 334 HEAD_SYMBOLS 335 336 /* 337 * Sections that should stay zero sized, which is safer to 338 * explicitly check instead of blindly discarding. 339 */ 340 .plt : { 341 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 342 } 343 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 344 345 .data.rel.ro : { *(.data.rel.ro) } 346 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 347} 348 349#include "image-vars.h" 350 351/* 352 * The HYP init code and ID map text can't be longer than a page each. The 353 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 354 * it should also not cross a page boundary. 355 */ 356ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 357 "HYP init code too big") 358ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 359 "ID map text too big or misaligned") 360#ifdef CONFIG_HIBERNATION 361ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K, 362 "Hibernate exit text is bigger than 4 KiB") 363ASSERT(__hibernate_exit_text_start == swsusp_arch_suspend_exit, 364 "Hibernate exit text does not start with swsusp_arch_suspend_exit") 365#endif 366#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 367ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE, 368 "Entry trampoline text too big") 369#endif 370#ifdef CONFIG_KVM 371ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 372#endif 373/* 374 * If padding is applied before .head.text, virt<->phys conversions will fail. 375 */ 376ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 377 378ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET, 379 "RESERVED_SWAPPER_OFFSET is wrong!") 380 381#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 382ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET, 383 "TRAMP_SWAPPER_OFFSET is wrong!") 384#endif 385 386#ifdef CONFIG_KEXEC_CORE 387/* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */ 388ASSERT(__relocate_new_kernel_end - __relocate_new_kernel_start <= SZ_4K, 389 "kexec relocation code is bigger than 4 KiB") 390ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K, "KEXEC_CONTROL_PAGE_SIZE is broken") 391ASSERT(__relocate_new_kernel_start == arm64_relocate_new_kernel, 392 "kexec control page does not start with arm64_relocate_new_kernel") 393#endif 394