LXR linux/arch/arm64/kernel/vmlinux.lds.S

   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