arch/powerpc/kernel/vmlinux.lds.S

   1 #ifdef CONFIG_PPC64
   2 #define PROVIDE32(x)    PROVIDE(__unused__##x)
   3 #else
   4 #define PROVIDE32(x)    PROVIDE(x)
   5 #endif
   6 #include <asm/page.h>
   7 #include <asm-generic/vmlinux.lds.h>
   8 #include <asm/cache.h>
   9
  10 ENTRY(_stext)
  11
  12 PHDRS {
  13         kernel PT_LOAD FLAGS(7); /* RWX */
  14         notes PT_NOTE FLAGS(0);
  15         dummy PT_NOTE FLAGS(0);
  16
  17         /* binutils < 2.18 has a bug that makes it misbehave when taking an
  18            ELF file with all segments at load address 0 as input.  This
  19            happens when running "strip" on vmlinux, because of the AT() magic
  20            in this linker script.  People using GCC >= 4.2 won't run into
  21            this problem, because the "build-id" support will put some data
  22            into the "notes" segment (at a non-zero load address).
  23
  24            To work around this, we force some data into both the "dummy"
  25            segment and the kernel segment, so the dummy segment will get a
  26            non-zero load address.  It's not enough to always create the
  27            "notes" segment, since if nothing gets assigned to it, its load
  28            address will be zero.  */
  29 }
  30
  31 #ifdef CONFIG_PPC64
  32 OUTPUT_ARCH(powerpc:common64)
  33 jiffies = jiffies_64;
  34 #else
  35 OUTPUT_ARCH(powerpc:common)
  36 jiffies = jiffies_64 + 4;
  37 #endif
  38 SECTIONS
  39 {
  40         /* Sections to be discarded. */
  41         /DISCARD/ : {
  42         *(.exitcall.exit)
  43         EXIT_DATA
  44         }
  45
  46         . = KERNELBASE;
  47
  48 /*
  49  * Text, read only data and other permanent read-only sections
  50  */
  51
  52         /* Text and gots */
  53         .text : AT(ADDR(.text) - LOAD_OFFSET) {
  54                 ALIGN_FUNCTION();
  55                 *(.text.head)
  56                 _text = .;
  57                 *(.text .fixup .text.init.refok .exit.text.refok __ftr_alt_*)
  58                 SCHED_TEXT
  59                 LOCK_TEXT
  60                 KPROBES_TEXT
  61
  62 #ifdef CONFIG_PPC32
  63                 *(.got1)
  64                 __got2_start = .;
  65                 *(.got2)
  66                 __got2_end = .;
  67 #endif /* CONFIG_PPC32 */
  68
  69         } :kernel
  70
  71         . = ALIGN(PAGE_SIZE);
  72         _etext = .;
  73         PROVIDE32 (etext = .);
  74
  75         /* Read-only data */
  76         RODATA
  77
  78         /* Exception & bug tables */
  79         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
  80                 __start___ex_table = .;
  81                 *(__ex_table)
  82                 __stop___ex_table = .;
  83         }
  84
  85         NOTES :kernel :notes
  86
  87         /* The dummy segment contents for the bug workaround mentioned above
  88            near PHDRS.  */
  89         .dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
  90                 LONG(0xf177)
  91         } :kernel :dummy
  92
  93 /*
  94  * Init sections discarded at runtime
  95  */
  96         . = ALIGN(PAGE_SIZE);
  97         __init_begin = .;
  98
  99         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
 100                 _sinittext = .;
 101                 INIT_TEXT
 102                 _einittext = .;
 103         } :kernel
 104
 105         /* .exit.text is discarded at runtime, not link time,
 106          * to deal with references from __bug_table
 107          */
 108         .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
 109                 EXIT_TEXT
 110         }
 111
 112         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
 113                 INIT_DATA
 114                 __vtop_table_begin = .;
 115                 *(.vtop_fixup);
 116                 __vtop_table_end = .;
 117                 __ptov_table_begin = .;
 118                 *(.ptov_fixup);
 119                 __ptov_table_end = .;
 120 #ifdef CONFIG_PPC_ISERIES
 121                 __dt_strings_start = .;
 122                 *(.dt_strings);
 123                 __dt_strings_end = .;
 124 #endif
 125         }
 126
 127         . = ALIGN(16);
 128         .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 129                 __setup_start = .;
 130                 *(.init.setup)
 131                 __setup_end = .;
 132         }
 133
 134         .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 135                 __initcall_start = .;
 136                 INITCALLS
 137                 __initcall_end = .;
 138                 }
 139
 140         .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 141                 __con_initcall_start = .;
 142                 *(.con_initcall.init)
 143                 __con_initcall_end = .;
 144         }
 145
 146         SECURITY_INIT
 147
 148         . = ALIGN(8);
 149         __ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
 150                 __start___ftr_fixup = .;
 151                 *(__ftr_fixup)
 152                 __stop___ftr_fixup = .;
 153         }
 154         . = ALIGN(8);
 155         __mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
 156                 __start___mmu_ftr_fixup = .;
 157                 *(__mmu_ftr_fixup)
 158                 __stop___mmu_ftr_fixup = .;
 159         }
 160         . = ALIGN(8);
 161         __lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
 162                 __start___lwsync_fixup = .;
 163                 *(__lwsync_fixup)
 164                 __stop___lwsync_fixup = .;
 165         }
 166 #ifdef CONFIG_PPC64
 167         . = ALIGN(8);
 168         __fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
 169                 __start___fw_ftr_fixup = .;
 170                 *(__fw_ftr_fixup)
 171                 __stop___fw_ftr_fixup = .;
 172         }
 173 #endif
 174 #ifdef CONFIG_BLK_DEV_INITRD
 175         . = ALIGN(PAGE_SIZE);
 176         .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 177                 __initramfs_start = .;
 178                 *(.init.ramfs)
 179                 __initramfs_end = .;
 180         }
 181 #endif
 182         . = ALIGN(PAGE_SIZE);
 183         .data.percpu  : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
 184                 __per_cpu_start = .;
 185                 *(.data.percpu)
 186                 *(.data.percpu.shared_aligned)
 187                 __per_cpu_end = .;
 188         }
 189
 190         . = ALIGN(8);
 191         .machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
 192                 __machine_desc_start = . ;
 193                 *(.machine.desc)
 194                 __machine_desc_end = . ;
 195         }
 196 #ifdef CONFIG_RELOCATABLE
 197         . = ALIGN(8);
 198         .dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET) { *(.dynsym) }
 199         .dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
 200         .dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
 201         {
 202                 __dynamic_start = .;
 203                 *(.dynamic)
 204         }
 205         .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
 206         .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
 207         .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
 208         {
 209                 __rela_dyn_start = .;
 210                 *(.rela*)
 211         }
 212 #endif
 213
 214         /* freed after init ends here */
 215         . = ALIGN(PAGE_SIZE);
 216         __init_end = .;
 217
 218 /*
 219  * And now the various read/write data
 220  */
 221
 222         . = ALIGN(PAGE_SIZE);
 223         _sdata = .;
 224
 225 #ifdef CONFIG_PPC32
 226         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 227                 DATA_DATA
 228                 *(.sdata)
 229                 *(.got.plt) *(.got)
 230         }
 231 #else
 232         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 233                 DATA_DATA
 234                 *(.data.rel*)
 235                 *(.toc1)
 236                 *(.branch_lt)
 237         }
 238
 239         .opd : AT(ADDR(.opd) - LOAD_OFFSET) {
 240                 *(.opd)
 241         }
 242
 243         .got : AT(ADDR(.got) - LOAD_OFFSET) {
 244                 __toc_start = .;
 245                 *(.got)
 246                 *(.toc)
 247         }
 248 #endif
 249
 250         . = ALIGN(PAGE_SIZE);
 251         _edata  =  .;
 252         PROVIDE32 (edata = .);
 253
 254         /* The initial task and kernel stack */
 255 #ifdef CONFIG_PPC32
 256         . = ALIGN(8192);
 257 #else
 258         . = ALIGN(16384);
 259 #endif
 260         .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
 261                 *(.data.init_task)
 262         }
 263
 264         . = ALIGN(PAGE_SIZE);
 265         .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
 266                 *(.data.page_aligned)
 267         }
 268
 269         .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
 270                 *(.data.cacheline_aligned)
 271         }
 272
 273         . = ALIGN(L1_CACHE_BYTES);
 274         .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
 275                 *(.data.read_mostly)
 276         }
 277
 278         . = ALIGN(PAGE_SIZE);
 279         .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
 280                 __nosave_begin = .;
 281                 *(.data.nosave)
 282                 . = ALIGN(PAGE_SIZE);
 283                 __nosave_end = .;
 284         }
 285
 286 /*
 287  * And finally the bss
 288  */
 289
 290         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 291                 __bss_start = .;
 292                 *(.sbss) *(.scommon)
 293                 *(.dynbss)
 294                 *(.bss)
 295                 *(COMMON)
 296                 __bss_stop = .;
 297         }
 298
 299         . = ALIGN(PAGE_SIZE);
 300         _end = . ;
 301         PROVIDE32 (end = .);
 302 }