arch/powerpc/kernel/vmlinux.lds.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifdef CONFIG_PPC64
   3 #define PROVIDE32(x)    PROVIDE(__unused__##x)
   4 #else
   5 #define PROVIDE32(x)    PROVIDE(x)
   6 #endif
   7 #include <asm/page.h>
   8 #include <asm-generic/vmlinux.lds.h>
   9 #include <asm/cache.h>
  10 #include <asm/thread_info.h>
  11
  12 #if defined(CONFIG_STRICT_KERNEL_RWX) && !defined(CONFIG_PPC32)
  13 #define STRICT_ALIGN_SIZE       (1 << 24)
  14 #else
  15 #define STRICT_ALIGN_SIZE       PAGE_SIZE
  16 #endif
  17
  18 ENTRY(_stext)
  19
  20 PHDRS {
  21         kernel PT_LOAD FLAGS(7); /* RWX */
  22         notes PT_NOTE FLAGS(0);
  23         dummy PT_NOTE FLAGS(0);
  24
  25         /* binutils < 2.18 has a bug that makes it misbehave when taking an
  26            ELF file with all segments at load address 0 as input.  This
  27            happens when running "strip" on vmlinux, because of the AT() magic
  28            in this linker script.  People using GCC >= 4.2 won't run into
  29            this problem, because the "build-id" support will put some data
  30            into the "notes" segment (at a non-zero load address).
  31
  32            To work around this, we force some data into both the "dummy"
  33            segment and the kernel segment, so the dummy segment will get a
  34            non-zero load address.  It's not enough to always create the
  35            "notes" segment, since if nothing gets assigned to it, its load
  36            address will be zero.  */
  37 }
  38
  39 #ifdef CONFIG_PPC64
  40 OUTPUT_ARCH(powerpc:common64)
  41 jiffies = jiffies_64;
  42 #else
  43 OUTPUT_ARCH(powerpc:common)
  44 jiffies = jiffies_64 + 4;
  45 #endif
  46 SECTIONS
  47 {
  48         . = KERNELBASE;
  49
  50 /*
  51  * Text, read only data and other permanent read-only sections
  52  */
  53
  54         _text = .;
  55         _stext = .;
  56
  57         /*
  58          * Head text.
  59          * This needs to be in its own output section to avoid ld placing
  60          * branch trampoline stubs randomly throughout the fixed sections,
  61          * which it will do (even if the branch comes from another section)
  62          * in order to optimize stub generation.
  63          */
  64         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {
  65 #ifdef CONFIG_PPC64
  66                 KEEP(*(.head.text.first_256B));
  67 #ifdef CONFIG_PPC_BOOK3E
  68 #else
  69                 KEEP(*(.head.text.real_vectors));
  70                 *(.head.text.real_trampolines);
  71                 KEEP(*(.head.text.virt_vectors));
  72                 *(.head.text.virt_trampolines);
  73 # if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
  74                 KEEP(*(.head.data.fwnmi_page));
  75 # endif
  76 #endif
  77 #else /* !CONFIG_PPC64 */
  78                 HEAD_TEXT
  79 #endif
  80         } :kernel
  81
  82         __head_end = .;
  83
  84 #ifdef CONFIG_PPC64
  85         /*
  86          * BLOCK(0) overrides the default output section alignment because
  87          * this needs to start right after .head.text in order for fixed
  88          * section placement to work.
  89          */
  90         .text BLOCK(0) : AT(ADDR(.text) - LOAD_OFFSET) {
  91 #ifdef CONFIG_LD_HEAD_STUB_CATCH
  92                 *(.linker_stub_catch);
  93                 . = . ;
  94 #endif
  95
  96 #else
  97         .text : AT(ADDR(.text) - LOAD_OFFSET) {
  98                 ALIGN_FUNCTION();
  99 #endif
 100                 /* careful! __ftr_alt_* sections need to be close to .text */
 101                 *(.text.hot .text .text.fixup .text.unlikely .fixup __ftr_alt_* .ref.text);
 102                 SCHED_TEXT
 103                 CPUIDLE_TEXT
 104                 LOCK_TEXT
 105                 KPROBES_TEXT
 106                 IRQENTRY_TEXT
 107                 SOFTIRQENTRY_TEXT
 108                 /*
 109                  * -Os builds call FP save/restore functions. The powerpc64
 110                  * linker generates those on demand in the .sfpr section.
 111                  * .sfpr gets placed at the beginning of a group of input
 112                  * sections, which can break start-of-text offset if it is
 113                  * included with the main text sections, so put it by itself.
 114                  */
 115                 *(.sfpr);
 116                 MEM_KEEP(init.text)
 117                 MEM_KEEP(exit.text)
 118
 119 #ifdef CONFIG_PPC32
 120                 *(.got1)
 121                 __got2_start = .;
 122                 *(.got2)
 123                 __got2_end = .;
 124 #endif /* CONFIG_PPC32 */
 125
 126         } :kernel
 127
 128         . = ALIGN(PAGE_SIZE);
 129         _etext = .;
 130         PROVIDE32 (etext = .);
 131
 132         /* Read-only data */
 133         RO_DATA(PAGE_SIZE)
 134
 135 #ifdef CONFIG_PPC64
 136         . = ALIGN(8);
 137         __rfi_flush_fixup : AT(ADDR(__rfi_flush_fixup) - LOAD_OFFSET) {
 138                 __start___rfi_flush_fixup = .;
 139                 *(__rfi_flush_fixup)
 140                 __stop___rfi_flush_fixup = .;
 141         }
 142 #endif
 143
 144         EXCEPTION_TABLE(0)
 145
 146         NOTES :kernel :notes
 147
 148         /* The dummy segment contents for the bug workaround mentioned above
 149            near PHDRS.  */
 150         .dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
 151                 LONG(0)
 152                 LONG(0)
 153                 LONG(0)
 154         } :kernel :dummy
 155
 156 /*
 157  * Init sections discarded at runtime
 158  */
 159         . = ALIGN(STRICT_ALIGN_SIZE);
 160         __init_begin = .;
 161         INIT_TEXT_SECTION(PAGE_SIZE) :kernel
 162
 163         /* .exit.text is discarded at runtime, not link time,
 164          * to deal with references from __bug_table
 165          */
 166         .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
 167                 EXIT_TEXT
 168         }
 169
 170         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
 171                 INIT_DATA
 172                 __vtop_table_begin = .;
 173                 *(.vtop_fixup);
 174                 __vtop_table_end = .;
 175                 __ptov_table_begin = .;
 176                 *(.ptov_fixup);
 177                 __ptov_table_end = .;
 178         }
 179
 180         .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 181                 INIT_SETUP(16)
 182         }
 183
 184         .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 185                 INIT_CALLS
 186         }
 187
 188         .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 189                 CON_INITCALL
 190         }
 191
 192         SECURITY_INIT
 193
 194         . = ALIGN(8);
 195         __ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
 196                 __start___ftr_fixup = .;
 197                 *(__ftr_fixup)
 198                 __stop___ftr_fixup = .;
 199         }
 200         . = ALIGN(8);
 201         __mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
 202                 __start___mmu_ftr_fixup = .;
 203                 *(__mmu_ftr_fixup)
 204                 __stop___mmu_ftr_fixup = .;
 205         }
 206         . = ALIGN(8);
 207         __lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
 208                 __start___lwsync_fixup = .;
 209                 *(__lwsync_fixup)
 210                 __stop___lwsync_fixup = .;
 211         }
 212 #ifdef CONFIG_PPC64
 213         . = ALIGN(8);
 214         __fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
 215                 __start___fw_ftr_fixup = .;
 216                 *(__fw_ftr_fixup)
 217                 __stop___fw_ftr_fixup = .;
 218         }
 219 #endif
 220         .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 221                 INIT_RAM_FS
 222         }
 223
 224         PERCPU_SECTION(L1_CACHE_BYTES)
 225
 226         . = ALIGN(8);
 227         .machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
 228                 __machine_desc_start = . ;
 229                 *(.machine.desc)
 230                 __machine_desc_end = . ;
 231         }
 232 #ifdef CONFIG_RELOCATABLE
 233         . = ALIGN(8);
 234         .dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET)
 235         {
 236 #ifdef CONFIG_PPC32
 237                 __dynamic_symtab = .;
 238 #endif
 239                 *(.dynsym)
 240         }
 241         .dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
 242         .dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
 243         {
 244                 __dynamic_start = .;
 245                 *(.dynamic)
 246         }
 247         .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
 248         .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
 249         .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
 250         {
 251                 __rela_dyn_start = .;
 252                 *(.rela*)
 253         }
 254 #endif
 255         /* .exit.data is discarded at runtime, not link time,
 256          * to deal with references from .exit.text
 257          */
 258         .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
 259                 EXIT_DATA
 260         }
 261
 262         /* freed after init ends here */
 263         . = ALIGN(PAGE_SIZE);
 264         __init_end = .;
 265
 266 /*
 267  * And now the various read/write data
 268  */
 269
 270         . = ALIGN(PAGE_SIZE);
 271         _sdata = .;
 272
 273 #ifdef CONFIG_PPC32
 274         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 275                 DATA_DATA
 276                 *(.sdata)
 277                 *(.sdata2)
 278                 *(.got.plt) *(.got)
 279                 *(.plt)
 280         }
 281 #else
 282         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 283                 DATA_DATA
 284                 *(.data.rel*)
 285                 *(.toc1)
 286                 *(.branch_lt)
 287         }
 288
 289         .opd : AT(ADDR(.opd) - LOAD_OFFSET) {
 290                 *(.opd)
 291         }
 292
 293         . = ALIGN(256);
 294         .got : AT(ADDR(.got) - LOAD_OFFSET) {
 295                 __toc_start = .;
 296 #ifndef CONFIG_RELOCATABLE
 297                 __prom_init_toc_start = .;
 298                 arch/powerpc/kernel/prom_init.o*(.toc .got)
 299                 __prom_init_toc_end = .;
 300 #endif
 301                 *(.got)
 302                 *(.toc)
 303         }
 304 #endif
 305
 306         /* The initial task and kernel stack */
 307         INIT_TASK_DATA_SECTION(THREAD_SIZE)
 308
 309         .data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
 310                 PAGE_ALIGNED_DATA(PAGE_SIZE)
 311         }
 312
 313         .data..cacheline_aligned : AT(ADDR(.data..cacheline_aligned) - LOAD_OFFSET) {
 314                 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
 315         }
 316
 317         .data..read_mostly : AT(ADDR(.data..read_mostly) - LOAD_OFFSET) {
 318                 READ_MOSTLY_DATA(L1_CACHE_BYTES)
 319         }
 320
 321         . = ALIGN(PAGE_SIZE);
 322         .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
 323                 NOSAVE_DATA
 324         }
 325
 326         BUG_TABLE
 327
 328         . = ALIGN(PAGE_SIZE);
 329         _edata  =  .;
 330         PROVIDE32 (edata = .);
 331
 332 /*
 333  * And finally the bss
 334  */
 335
 336         BSS_SECTION(0, 0, 0)
 337
 338         . = ALIGN(PAGE_SIZE);
 339         _end = . ;
 340         PROVIDE32 (end = .);
 341
 342         STABS_DEBUG
 343
 344         DWARF_DEBUG
 345
 346         DISCARDS
 347         /DISCARD/ : {
 348                 *(*.EMB.apuinfo)
 349                 *(.glink .iplt .plt .rela* .comment)
 350                 *(.gnu.version*)
 351                 *(.gnu.attributes)
 352                 *(.eh_frame)
 353         }
 354 }