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 8 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/memory.h> 67#include <asm/page.h> 68 69#include "image.h" 70 71OUTPUT_ARCH(aarch64) 72ENTRY(_text) 73 74jiffies = jiffies_64; 75 76#define HYPERVISOR_TEXT \ 77 . = ALIGN(PAGE_SIZE); \ 78 __hyp_idmap_text_start = .; \ 79 *(.hyp.idmap.text) \ 80 __hyp_idmap_text_end = .; \ 81 __hyp_text_start = .; \ 82 *(.hyp.text) \ 83 HYPERVISOR_EXTABLE \ 84 . = ALIGN(PAGE_SIZE); \ 85 __hyp_text_end = .; 86 87#define IDMAP_TEXT \ 88 . = ALIGN(SZ_4K); \ 89 __idmap_text_start = .; \ 90 *(.idmap.text) \ 91 __idmap_text_end = .; 92 93#ifdef CONFIG_HIBERNATION 94#define HIBERNATE_TEXT \ 95 . = ALIGN(SZ_4K); \ 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_UNMAP_KERNEL_AT_EL0 104#define TRAMP_TEXT \ 105 . = ALIGN(PAGE_SIZE); \ 106 __entry_tramp_text_start = .; \ 107 *(.entry.tramp.text) \ 108 . = ALIGN(PAGE_SIZE); \ 109 __entry_tramp_text_end = .; 110#else 111#define TRAMP_TEXT 112#endif 113 114/* 115 * The size of the PE/COFF section that covers the kernel image, which 116 * runs from _stext to _edata, must be a round multiple of the PE/COFF 117 * FileAlignment, which we set to its minimum value of 0x200. '_stext' 118 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 119 * boundary should be sufficient. 120 */ 121PECOFF_FILE_ALIGNMENT = 0x200; 122 123#ifdef CONFIG_EFI 124#define PECOFF_EDATA_PADDING \ 125 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 126#else 127#define PECOFF_EDATA_PADDING 128#endif 129 130SECTIONS 131{ 132 /* 133 * XXX: The linker does not define how output sections are 134 * assigned to input sections when there are multiple statements 135 * matching the same input section name. There is no documented 136 * order of matching. 137 */ 138 DISCARDS 139 /DISCARD/ : { 140 *(.interp .dynamic) 141 *(.dynsym .dynstr .hash .gnu.hash) 142 } 143 144 . = KIMAGE_VADDR; 145 146 .head.text : { 147 _text = .; 148 HEAD_TEXT 149 } 150 .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */ 151 _stext = .; /* Text and read-only data */ 152 IRQENTRY_TEXT 153 SOFTIRQENTRY_TEXT 154 ENTRY_TEXT 155 TEXT_TEXT 156 SCHED_TEXT 157 CPUIDLE_TEXT 158 LOCK_TEXT 159 KPROBES_TEXT 160 HYPERVISOR_TEXT 161 IDMAP_TEXT 162 HIBERNATE_TEXT 163 TRAMP_TEXT 164 *(.fixup) 165 *(.gnu.warning) 166 . = ALIGN(16); 167 *(.got) /* Global offset table */ 168 } 169 170 /* 171 * Make sure that the .got.plt is either completely empty or it 172 * contains only the lazy dispatch entries. 173 */ 174 .got.plt : { *(.got.plt) } 175 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 176 "Unexpected GOT/PLT entries detected!") 177 178 . = ALIGN(SEGMENT_ALIGN); 179 _etext = .; /* End of text section */ 180 181 /* everything from this point to __init_begin will be marked RO NX */ 182 RO_DATA(PAGE_SIZE) 183 184 HYPERVISOR_DATA_SECTIONS 185 186 idmap_pg_dir = .; 187 . += IDMAP_DIR_SIZE; 188 idmap_pg_end = .; 189 190#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 191 tramp_pg_dir = .; 192 . += PAGE_SIZE; 193#endif 194 195 reserved_pg_dir = .; 196 . += PAGE_SIZE; 197 198 swapper_pg_dir = .; 199 . += PAGE_SIZE; 200 201 . = ALIGN(SEGMENT_ALIGN); 202 __init_begin = .; 203 __inittext_begin = .; 204 205 INIT_TEXT_SECTION(8) 206 207 __exittext_begin = .; 208 .exit.text : { 209 EXIT_TEXT 210 } 211 __exittext_end = .; 212 213 . = ALIGN(4); 214 .altinstructions : { 215 __alt_instructions = .; 216 *(.altinstructions) 217 __alt_instructions_end = .; 218 } 219 220 . = ALIGN(SEGMENT_ALIGN); 221 __inittext_end = .; 222 __initdata_begin = .; 223 224 .init.data : { 225 INIT_DATA 226 INIT_SETUP(16) 227 INIT_CALLS 228 CON_INITCALL 229 INIT_RAM_FS 230 *(.init.altinstructions .init.bss) /* from the EFI stub */ 231 } 232 .exit.data : { 233 EXIT_DATA 234 } 235 236 PERCPU_SECTION(L1_CACHE_BYTES) 237 HYPERVISOR_PERCPU_SECTION 238 239 HYPERVISOR_RELOC_SECTION 240 241 .rela.dyn : ALIGN(8) { 242 *(.rela .rela*) 243 } 244 245 __rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR); 246 __rela_size = SIZEOF(.rela.dyn); 247 248#ifdef CONFIG_RELR 249 .relr.dyn : ALIGN(8) { 250 *(.relr.dyn) 251 } 252 253 __relr_offset = ABSOLUTE(ADDR(.relr.dyn) - KIMAGE_VADDR); 254 __relr_size = SIZEOF(.relr.dyn); 255#endif 256 257 . = ALIGN(SEGMENT_ALIGN); 258 __initdata_end = .; 259 __init_end = .; 260 261 _data = .; 262 _sdata = .; 263 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 264 265 /* 266 * Data written with the MMU off but read with the MMU on requires 267 * cache lines to be invalidated, discarding up to a Cache Writeback 268 * Granule (CWG) of data from the cache. Keep the section that 269 * requires this type of maintenance to be in its own Cache Writeback 270 * Granule (CWG) area so the cache maintenance operations don't 271 * interfere with adjacent data. 272 */ 273 .mmuoff.data.write : ALIGN(SZ_2K) { 274 __mmuoff_data_start = .; 275 *(.mmuoff.data.write) 276 } 277 . = ALIGN(SZ_2K); 278 .mmuoff.data.read : { 279 *(.mmuoff.data.read) 280 __mmuoff_data_end = .; 281 } 282 283 PECOFF_EDATA_PADDING 284 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 285 _edata = .; 286 287 BSS_SECTION(SBSS_ALIGN, 0, 0) 288 289 . = ALIGN(PAGE_SIZE); 290 init_pg_dir = .; 291 . += INIT_DIR_SIZE; 292 init_pg_end = .; 293 294 . = ALIGN(SEGMENT_ALIGN); 295 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 296 _end = .; 297 298 STABS_DEBUG 299 DWARF_DEBUG 300 ELF_DETAILS 301 302 HEAD_SYMBOLS 303 304 /* 305 * Sections that should stay zero sized, which is safer to 306 * explicitly check instead of blindly discarding. 307 */ 308 .plt : { 309 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 310 } 311 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 312 313 .data.rel.ro : { *(.data.rel.ro) } 314 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 315} 316 317#include "image-vars.h" 318 319/* 320 * The HYP init code and ID map text can't be longer than a page each. The 321 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 322 * it should also not cross a page boundary. 323 */ 324ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 325 "HYP init code too big") 326ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 327 "ID map text too big or misaligned") 328#ifdef CONFIG_HIBERNATION 329ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1)) 330 <= SZ_4K, "Hibernate exit text too big or misaligned") 331#endif 332#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 333ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) == PAGE_SIZE, 334 "Entry trampoline text too big") 335#endif 336#ifdef CONFIG_KVM 337ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 338#endif 339/* 340 * If padding is applied before .head.text, virt<->phys conversions will fail. 341 */ 342ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 343 344ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET, 345 "RESERVED_SWAPPER_OFFSET is wrong!") 346 347#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 348ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET, 349 "TRAMP_SWAPPER_OFFSET is wrong!") 350#endif 351