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_RODATA_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_DATA_SECTION \ 27 HYP_SECTION_NAME(.data) : { \ 28 . = ALIGN(PAGE_SIZE); \ 29 __hyp_data_start = .; \ 30 *(HYP_SECTION_NAME(.data)) \ 31 . = ALIGN(PAGE_SIZE); \ 32 __hyp_data_end = .; \ 33 } 34 35#define HYPERVISOR_PERCPU_SECTION \ 36 . = ALIGN(PAGE_SIZE); \ 37 HYP_SECTION_NAME(.data..percpu) : { \ 38 *(HYP_SECTION_NAME(.data..percpu)) \ 39 } 40 41#define HYPERVISOR_RELOC_SECTION \ 42 .hyp.reloc : ALIGN(4) { \ 43 __hyp_reloc_begin = .; \ 44 *(.hyp.reloc) \ 45 __hyp_reloc_end = .; \ 46 } 47 48#define BSS_FIRST_SECTIONS \ 49 __hyp_bss_start = .; \ 50 *(HYP_SECTION_NAME(.bss)) \ 51 . = ALIGN(PAGE_SIZE); \ 52 __hyp_bss_end = .; 53 54/* 55 * We require that __hyp_bss_start and __bss_start are aligned, and enforce it 56 * with an assertion. But the BSS_SECTION macro places an empty .sbss section 57 * between them, which can in some cases cause the linker to misalign them. To 58 * work around the issue, force a page alignment for __bss_start. 59 */ 60#define SBSS_ALIGN PAGE_SIZE 61#else /* CONFIG_KVM */ 62#define HYPERVISOR_EXTABLE 63#define HYPERVISOR_RODATA_SECTIONS 64#define HYPERVISOR_DATA_SECTION 65#define HYPERVISOR_PERCPU_SECTION 66#define HYPERVISOR_RELOC_SECTION 67#define SBSS_ALIGN 0 68#endif 69 70#define RO_EXCEPTION_TABLE_ALIGN 8 71#define RUNTIME_DISCARD_EXIT 72 73#include <asm-generic/vmlinux.lds.h> 74#include <asm/cache.h> 75#include <asm/kernel-pgtable.h> 76#include <asm/memory.h> 77#include <asm/page.h> 78 79#include "image.h" 80 81OUTPUT_ARCH(aarch64) 82ENTRY(_text) 83 84jiffies = jiffies_64; 85 86#define HYPERVISOR_TEXT \ 87 . = ALIGN(PAGE_SIZE); \ 88 __hyp_idmap_text_start = .; \ 89 *(.hyp.idmap.text) \ 90 __hyp_idmap_text_end = .; \ 91 __hyp_text_start = .; \ 92 *(.hyp.text) \ 93 HYPERVISOR_EXTABLE \ 94 . = ALIGN(PAGE_SIZE); \ 95 __hyp_text_end = .; 96 97#define IDMAP_TEXT \ 98 . = ALIGN(SZ_4K); \ 99 __idmap_text_start = .; \ 100 *(.idmap.text) \ 101 __idmap_text_end = .; 102 103#ifdef CONFIG_HIBERNATION 104#define HIBERNATE_TEXT \ 105 . = ALIGN(SZ_4K); \ 106 __hibernate_exit_text_start = .; \ 107 *(.hibernate_exit.text) \ 108 __hibernate_exit_text_end = .; 109#else 110#define HIBERNATE_TEXT 111#endif 112 113#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 114#define TRAMP_TEXT \ 115 . = ALIGN(PAGE_SIZE); \ 116 __entry_tramp_text_start = .; \ 117 *(.entry.tramp.text) \ 118 . = ALIGN(PAGE_SIZE); \ 119 __entry_tramp_text_end = .; 120#else 121#define TRAMP_TEXT 122#endif 123 124/* 125 * The size of the PE/COFF section that covers the kernel image, which 126 * runs from _stext to _edata, must be a round multiple of the PE/COFF 127 * FileAlignment, which we set to its minimum value of 0x200. '_stext' 128 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 129 * boundary should be sufficient. 130 */ 131PECOFF_FILE_ALIGNMENT = 0x200; 132 133#ifdef CONFIG_EFI 134#define PECOFF_EDATA_PADDING \ 135 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 136#else 137#define PECOFF_EDATA_PADDING 138#endif 139 140SECTIONS 141{ 142 /* 143 * XXX: The linker does not define how output sections are 144 * assigned to input sections when there are multiple statements 145 * matching the same input section name. There is no documented 146 * order of matching. 147 */ 148 DISCARDS 149 /DISCARD/ : { 150 *(.interp .dynamic) 151 *(.dynsym .dynstr .hash .gnu.hash) 152 } 153 154 . = KIMAGE_VADDR; 155 156 .head.text : { 157 _text = .; 158 HEAD_TEXT 159 } 160 .text : { /* Real text segment */ 161 _stext = .; /* Text and read-only data */ 162 IRQENTRY_TEXT 163 SOFTIRQENTRY_TEXT 164 ENTRY_TEXT 165 TEXT_TEXT 166 SCHED_TEXT 167 CPUIDLE_TEXT 168 LOCK_TEXT 169 KPROBES_TEXT 170 HYPERVISOR_TEXT 171 IDMAP_TEXT 172 HIBERNATE_TEXT 173 TRAMP_TEXT 174 *(.fixup) 175 *(.gnu.warning) 176 . = ALIGN(16); 177 *(.got) /* Global offset table */ 178 } 179 180 /* 181 * Make sure that the .got.plt is either completely empty or it 182 * contains only the lazy dispatch entries. 183 */ 184 .got.plt : { *(.got.plt) } 185 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 186 "Unexpected GOT/PLT entries detected!") 187 188 . = ALIGN(SEGMENT_ALIGN); 189 _etext = .; /* End of text section */ 190 191 /* everything from this point to __init_begin will be marked RO NX */ 192 RO_DATA(PAGE_SIZE) 193 194 HYPERVISOR_RODATA_SECTIONS 195 196 idmap_pg_dir = .; 197 . += IDMAP_DIR_SIZE; 198 idmap_pg_end = .; 199 200#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 201 tramp_pg_dir = .; 202 . += PAGE_SIZE; 203#endif 204 205 reserved_pg_dir = .; 206 . += PAGE_SIZE; 207 208 swapper_pg_dir = .; 209 . += PAGE_SIZE; 210 211 . = ALIGN(SEGMENT_ALIGN); 212 __init_begin = .; 213 __inittext_begin = .; 214 215 INIT_TEXT_SECTION(8) 216 217 __exittext_begin = .; 218 .exit.text : { 219 EXIT_TEXT 220 } 221 __exittext_end = .; 222 223 . = ALIGN(4); 224 .altinstructions : { 225 __alt_instructions = .; 226 *(.altinstructions) 227 __alt_instructions_end = .; 228 } 229 230 . = ALIGN(SEGMENT_ALIGN); 231 __inittext_end = .; 232 __initdata_begin = .; 233 234 .init.data : { 235 INIT_DATA 236 INIT_SETUP(16) 237 INIT_CALLS 238 CON_INITCALL 239 INIT_RAM_FS 240 *(.init.altinstructions .init.rodata.* .init.bss) /* from the EFI stub */ 241 } 242 .exit.data : { 243 EXIT_DATA 244 } 245 246 PERCPU_SECTION(L1_CACHE_BYTES) 247 HYPERVISOR_PERCPU_SECTION 248 249 HYPERVISOR_RELOC_SECTION 250 251 .rela.dyn : ALIGN(8) { 252 *(.rela .rela*) 253 } 254 255 __rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR); 256 __rela_size = SIZEOF(.rela.dyn); 257 258#ifdef CONFIG_RELR 259 .relr.dyn : ALIGN(8) { 260 *(.relr.dyn) 261 } 262 263 __relr_offset = ABSOLUTE(ADDR(.relr.dyn) - KIMAGE_VADDR); 264 __relr_size = SIZEOF(.relr.dyn); 265#endif 266 267 . = ALIGN(SEGMENT_ALIGN); 268 __initdata_end = .; 269 __init_end = .; 270 271 _data = .; 272 _sdata = .; 273 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 274 275 HYPERVISOR_DATA_SECTION 276 277 /* 278 * Data written with the MMU off but read with the MMU on requires 279 * cache lines to be invalidated, discarding up to a Cache Writeback 280 * Granule (CWG) of data from the cache. Keep the section that 281 * requires this type of maintenance to be in its own Cache Writeback 282 * Granule (CWG) area so the cache maintenance operations don't 283 * interfere with adjacent data. 284 */ 285 .mmuoff.data.write : ALIGN(SZ_2K) { 286 __mmuoff_data_start = .; 287 *(.mmuoff.data.write) 288 } 289 . = ALIGN(SZ_2K); 290 .mmuoff.data.read : { 291 *(.mmuoff.data.read) 292 __mmuoff_data_end = .; 293 } 294 295 PECOFF_EDATA_PADDING 296 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 297 _edata = .; 298 299 BSS_SECTION(SBSS_ALIGN, 0, 0) 300 301 . = ALIGN(PAGE_SIZE); 302 init_pg_dir = .; 303 . += INIT_DIR_SIZE; 304 init_pg_end = .; 305 306 . = ALIGN(SEGMENT_ALIGN); 307 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 308 _end = .; 309 310 STABS_DEBUG 311 DWARF_DEBUG 312 ELF_DETAILS 313 314 HEAD_SYMBOLS 315 316 /* 317 * Sections that should stay zero sized, which is safer to 318 * explicitly check instead of blindly discarding. 319 */ 320 .plt : { 321 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 322 } 323 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 324 325 .data.rel.ro : { *(.data.rel.ro) } 326 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 327} 328 329#include "image-vars.h" 330 331/* 332 * The HYP init code and ID map text can't be longer than a page each. The 333 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 334 * it should also not cross a page boundary. 335 */ 336ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 337 "HYP init code too big") 338ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 339 "ID map text too big or misaligned") 340#ifdef CONFIG_HIBERNATION 341ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1)) 342 <= SZ_4K, "Hibernate exit text too big or misaligned") 343#endif 344#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 345ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE, 346 "Entry trampoline text too big") 347#endif 348#ifdef CONFIG_KVM 349ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 350#endif 351/* 352 * If padding is applied before .head.text, virt<->phys conversions will fail. 353 */ 354ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 355