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/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 *(.gnu.warning) 165 . = ALIGN(16); 166 *(.got) /* Global offset table */ 167 } 168 169 /* 170 * Make sure that the .got.plt is either completely empty or it 171 * contains only the lazy dispatch entries. 172 */ 173 .got.plt : { *(.got.plt) } 174 ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, 175 "Unexpected GOT/PLT entries detected!") 176 177 . = ALIGN(SEGMENT_ALIGN); 178 _etext = .; /* End of text section */ 179 180 /* everything from this point to __init_begin will be marked RO NX */ 181 RO_DATA(PAGE_SIZE) 182 183 HYPERVISOR_DATA_SECTIONS 184 185 idmap_pg_dir = .; 186 . += IDMAP_DIR_SIZE; 187 idmap_pg_end = .; 188 189#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 190 tramp_pg_dir = .; 191 . += PAGE_SIZE; 192#endif 193 194 reserved_pg_dir = .; 195 . += PAGE_SIZE; 196 197 swapper_pg_dir = .; 198 . += PAGE_SIZE; 199 200 . = ALIGN(SEGMENT_ALIGN); 201 __init_begin = .; 202 __inittext_begin = .; 203 204 INIT_TEXT_SECTION(8) 205 206 __exittext_begin = .; 207 .exit.text : { 208 EXIT_TEXT 209 } 210 __exittext_end = .; 211 212 . = ALIGN(4); 213 .altinstructions : { 214 __alt_instructions = .; 215 *(.altinstructions) 216 __alt_instructions_end = .; 217 } 218 219 . = ALIGN(SEGMENT_ALIGN); 220 __inittext_end = .; 221 __initdata_begin = .; 222 223 .init.data : { 224 INIT_DATA 225 INIT_SETUP(16) 226 INIT_CALLS 227 CON_INITCALL 228 INIT_RAM_FS 229 *(.init.altinstructions .init.bss) /* from the EFI stub */ 230 } 231 .exit.data : { 232 EXIT_DATA 233 } 234 235 PERCPU_SECTION(L1_CACHE_BYTES) 236 HYPERVISOR_PERCPU_SECTION 237 238 HYPERVISOR_RELOC_SECTION 239 240 .rela.dyn : ALIGN(8) { 241 *(.rela .rela*) 242 } 243 244 __rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR); 245 __rela_size = SIZEOF(.rela.dyn); 246 247#ifdef CONFIG_RELR 248 .relr.dyn : ALIGN(8) { 249 *(.relr.dyn) 250 } 251 252 __relr_offset = ABSOLUTE(ADDR(.relr.dyn) - KIMAGE_VADDR); 253 __relr_size = SIZEOF(.relr.dyn); 254#endif 255 256 . = ALIGN(SEGMENT_ALIGN); 257 __initdata_end = .; 258 __init_end = .; 259 260 _data = .; 261 _sdata = .; 262 RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) 263 264 /* 265 * Data written with the MMU off but read with the MMU on requires 266 * cache lines to be invalidated, discarding up to a Cache Writeback 267 * Granule (CWG) of data from the cache. Keep the section that 268 * requires this type of maintenance to be in its own Cache Writeback 269 * Granule (CWG) area so the cache maintenance operations don't 270 * interfere with adjacent data. 271 */ 272 .mmuoff.data.write : ALIGN(SZ_2K) { 273 __mmuoff_data_start = .; 274 *(.mmuoff.data.write) 275 } 276 . = ALIGN(SZ_2K); 277 .mmuoff.data.read : { 278 *(.mmuoff.data.read) 279 __mmuoff_data_end = .; 280 } 281 282 PECOFF_EDATA_PADDING 283 __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); 284 _edata = .; 285 286 BSS_SECTION(SBSS_ALIGN, 0, 0) 287 288 . = ALIGN(PAGE_SIZE); 289 init_pg_dir = .; 290 . += INIT_DIR_SIZE; 291 init_pg_end = .; 292 293 . = ALIGN(SEGMENT_ALIGN); 294 __pecoff_data_size = ABSOLUTE(. - __initdata_begin); 295 _end = .; 296 297 STABS_DEBUG 298 DWARF_DEBUG 299 ELF_DETAILS 300 301 HEAD_SYMBOLS 302 303 /* 304 * Sections that should stay zero sized, which is safer to 305 * explicitly check instead of blindly discarding. 306 */ 307 .plt : { 308 *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt) 309 } 310 ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 311 312 .data.rel.ro : { *(.data.rel.ro) } 313 ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!") 314} 315 316#include "image-vars.h" 317 318/* 319 * The HYP init code and ID map text can't be longer than a page each. The 320 * former is page-aligned, but the latter may not be with 16K or 64K pages, so 321 * it should also not cross a page boundary. 322 */ 323ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE, 324 "HYP init code too big") 325ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, 326 "ID map text too big or misaligned") 327#ifdef CONFIG_HIBERNATION 328ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1)) 329 <= SZ_4K, "Hibernate exit text too big or misaligned") 330#endif 331#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 332ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) == PAGE_SIZE, 333 "Entry trampoline text too big") 334#endif 335#ifdef CONFIG_KVM 336ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned") 337#endif 338/* 339 * If padding is applied before .head.text, virt<->phys conversions will fail. 340 */ 341ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned") 342 343ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET, 344 "RESERVED_SWAPPER_OFFSET is wrong!") 345 346#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 347ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET, 348 "TRAMP_SWAPPER_OFFSET is wrong!") 349#endif 350