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(SZ_4K); \ 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(SZ_4K); \ 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#else 122#define TRAMP_TEXT 123#endif 124 125/* 126 * The size of the PE/COFF section that covers the kernel image, which 127 * runs from _stext to _edata, must be a round multiple of the PE/COFF 128 * FileAlignment, which we set to its minimum value of 0x200. '_stext' 129 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned 130 * boundary should be sufficient. 131 */ 132PECOFF_FILE_ALIGNMENT = 0x200; 133 134#ifdef CONFIG_EFI 135#define PECOFF_EDATA_PADDING \ 136 .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } 137#else 138#define PECOFF_EDATA_PADDING 139#endif 140 141SECTIONS 142{ 143 /* 144 * XXX: The linker does not define how output sections are 145 * assigned to input sections when there are multiple statements 146 * matching the same input section name. There is no documented 147 * order of matching. 148 */ 149 DISCARDS 150 /DISCARD/ : { 151 *(.interp .dynamic) 152 *(.dynsym .dynstr .hash .gnu.hash) 153 } 154 155 . = KIMAGE_VADDR; 156 157 .head.text : { 158 _text = .; 159 HEAD_TEXT 160 } 161 .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */ 162 _stext = .; /* Text and read-only data */ 163 IRQENTRY_TEXT 164 SOFTIRQENTRY_TEXT 165 ENTRY_TEXT 166 TEXT_TEXT 167 SCHED_TEXT 168 CPUIDLE_TEXT 169 LOCK_TEXT 170 KPROBES_TEXT 171 HYPERVISOR_TEXT 172 IDMAP_TEXT 173 HIBERNATE_TEXT 174 KEXEC_TEXT 175 TRAMP_TEXT 176 *(.gnu.warning) 177 . = ALIGN(16); 178 *(.got) /* Global offset table */ 179 } 180 181 /* 182 * Make sure that the .got.plt is either completely empty or it 183 * contains only the lazy dispatch entries. 184 */ 185 .got.plt : { *(.got.plt) } 186 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 187 "Unexpected GOT/PLT entries detected!") 188 189 . = ALIGN(SEGMENT_ALIGN); 190 _etext = .; /* End of text section */ 191 192 /* everything from this point to __init_begin will be marked RO NX */ 193 RO_DATA(PAGE_SIZE) 194 195 HYPERVISOR_DATA_SECTIONS 196 197 idmap_pg_dir = .; 198 . += IDMAP_DIR_SIZE; 199 idmap_pg_end = .; 200 201#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 202 tramp_pg_dir = .; 203 . += PAGE_SIZE; 204#endif 205 206 reserved_pg_dir = .; 207 . += PAGE_SIZE; 208 209 swapper_pg_dir = .; 210 . += PAGE_SIZE; 211 212 . = ALIGN(SEGMENT_ALIGN); 213 __init_begin = .; 214 __inittext_begin = .; 215 216 INIT_TEXT_SECTION(8) 217 218 __exittext_begin = .; 219 .exit.text : { 220 EXIT_TEXT 221 } 222 __exittext_end = .; 223 224 . = ALIGN(4); 225 .altinstructions : { 226 __alt_instructions = .; 227 *(.altinstructions) 228 __alt_instructions_end = .; 229 } 230 231 . = ALIGN(SEGMENT_ALIGN); 232 __inittext_end = .; 233 __initdata_begin = .; 234 235 .init.data : { 236 INIT_DATA 237 INIT_SETUP(16) 238 INIT_CALLS 239 CON_INITCALL 240 INIT_RAM_FS 241 *(.init.altinstructions .init.bss) /* from the EFI stub */ 242 } 243 .exit.data : { 244 EXIT_DATA 245 } 246 247 PERCPU_SECTION(L1_CACHE_BYTES) 248 HYPERVISOR_PERCPU_SECTION 249 250 HYPERVISOR_RELOC_SECTION 251 252 .rela.dyn : ALIGN(8) { 253 *(.rela .rela*) 254 } 255 256 __rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR); 257 __rela_size = SIZEOF(.rela.dyn); 258 259#ifdef CONFIG_RELR 260 .relr.dyn : ALIGN(8) { 261 *(.relr.dyn) 262 } 263 264 __relr_offset = ABSOLUTE(ADDR(.relr.dyn) - KIMAGE_VADDR); 265 __relr_size = SIZEOF(.relr.dyn); 266#endif 267 268 . = ALIGN(SEGMENT_ALIGN); 269 __initdata_end = .; 270 __init_end = .; 271 272 _data = .; 273 _sdata = .; 274 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 275 276 /* 277 * Data written with the MMU off but read with the MMU on requires 278 * cache lines to be invalidated, discarding up to a Cache Writeback 279 * Granule (CWG) of data from the cache. Keep the section that 280 * requires this type of maintenance to be in its own Cache Writeback 281 * Granule (CWG) area so the cache maintenance operations don't 282 * interfere with adjacent data. 283 */ 284 .mmuoff.data.write : ALIGN(SZ_2K) { 285 __mmuoff_data_start = .; 286 *(.mmuoff.data.write) 287 } 288 . = ALIGN(SZ_2K); 289 .mmuoff.data.read : { 290 *(.mmuoff.data.read) 291 __mmuoff_data_end = .; 292 } 293 294 PECOFF_EDATA_PADDING 295 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 296 _edata = .; 297 298 BSS_SECTION(SBSS_ALIGN, 0, 0) 299 300 . = ALIGN(PAGE_SIZE); 301 init_pg_dir = .; 302 . += INIT_DIR_SIZE; 303 init_pg_end = .; 304 305 . = ALIGN(SEGMENT_ALIGN); 306 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 307 _end = .; 308 309 STABS_DEBUG 310 DWARF_DEBUG 311 ELF_DETAILS 312 313 HEAD_SYMBOLS 314 315 /* 316 * Sections that should stay zero sized, which is safer to 317 * explicitly check instead of blindly discarding. 318 */ 319 .plt : { 320 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 321 } 322 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 323 324 .data.rel.ro : { *(.data.rel.ro) } 325 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 326} 327 328#include "image-vars.h" 329 330/* 331 * The HYP init code and ID map text can't be longer than a page each. The 332 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 333 * it should also not cross a page boundary. 334 */ 335ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 336 "HYP init code too big") 337ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 338 "ID map text too big or misaligned") 339#ifdef CONFIG_HIBERNATION 340ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1)) 341 <= SZ_4K, "Hibernate exit text too big or misaligned") 342#endif 343#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 344ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE, 345 "Entry trampoline text too big") 346#endif 347#ifdef CONFIG_KVM 348ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 349#endif 350/* 351 * If padding is applied before .head.text, virt<->phys conversions will fail. 352 */ 353ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 354 355ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET, 356 "RESERVED_SWAPPER_OFFSET is wrong!") 357 358#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 359ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET, 360 "TRAMP_SWAPPER_OFFSET is wrong!") 361#endif 362 363#ifdef CONFIG_KEXEC_CORE 364/* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */ 365ASSERT(__relocate_new_kernel_end - (__relocate_new_kernel_start & ~(SZ_4K - 1)) 366 <= SZ_4K, "kexec relocation code is too big or misaligned") 367ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K, "KEXEC_CONTROL_PAGE_SIZE is broken") 368#endif 369