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(0)
  91                 LONG(0)
  92                 LONG(0)
  93         } :kernel :dummy
  94
  95 /*
  96  * Init sections discarded at runtime
  97  */
  98         . = ALIGN(PAGE_SIZE);
  99         __init_begin = .;
 100
 101         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
 102                 _sinittext = .;
 103                 INIT_TEXT
 104                 _einittext = .;
 105         } :kernel
 106
 107         /* .exit.text is discarded at runtime, not link time,
 108          * to deal with references from __bug_table
 109          */
 110         .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
 111                 EXIT_TEXT
 112         }
 113
 114         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
 115                 INIT_DATA
 116                 __vtop_table_begin = .;
 117                 *(.vtop_fixup);
 118                 __vtop_table_end = .;
 119                 __ptov_table_begin = .;
 120                 *(.ptov_fixup);
 121                 __ptov_table_end = .;
 122 #ifdef CONFIG_PPC_ISERIES
 123                 __dt_strings_start = .;
 124                 *(.dt_strings);
 125                 __dt_strings_end = .;
 126 #endif
 127         }
 128
 129         . = ALIGN(16);
 130         .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 131                 __setup_start = .;
 132                 *(.init.setup)
 133                 __setup_end = .;
 134         }
 135
 136         .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 137                 __initcall_start = .;
 138                 INITCALLS
 139                 __initcall_end = .;
 140                 }
 141
 142         .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 143                 __con_initcall_start = .;
 144                 *(.con_initcall.init)
 145                 __con_initcall_end = .;
 146         }
 147
 148         SECURITY_INIT
 149
 150         . = ALIGN(8);
 151         __ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
 152                 __start___ftr_fixup = .;
 153                 *(__ftr_fixup)
 154                 __stop___ftr_fixup = .;
 155         }
 156         . = ALIGN(8);
 157         __mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
 158                 __start___mmu_ftr_fixup = .;
 159                 *(__mmu_ftr_fixup)
 160                 __stop___mmu_ftr_fixup = .;
 161         }
 162         . = ALIGN(8);
 163         __lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
 164                 __start___lwsync_fixup = .;
 165                 *(__lwsync_fixup)
 166                 __stop___lwsync_fixup = .;
 167         }
 168 #ifdef CONFIG_PPC64
 169         . = ALIGN(8);
 170         __fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
 171                 __start___fw_ftr_fixup = .;
 172                 *(__fw_ftr_fixup)
 173                 __stop___fw_ftr_fixup = .;
 174         }
 175 #endif
 176 #ifdef CONFIG_BLK_DEV_INITRD
 177         . = ALIGN(PAGE_SIZE);
 178         .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 179                 __initramfs_start = .;
 180                 *(.init.ramfs)
 181                 __initramfs_end = .;
 182         }
 183 #endif
 184         . = ALIGN(PAGE_SIZE);
 185         .data.percpu  : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
 186                 __per_cpu_start = .;
 187                 *(.data.percpu.page_aligned)
 188                 *(.data.percpu)
 189                 *(.data.percpu.shared_aligned)
 190                 __per_cpu_end = .;
 191         }
 192
 193         . = ALIGN(8);
 194         .machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
 195                 __machine_desc_start = . ;
 196                 *(.machine.desc)
 197                 __machine_desc_end = . ;
 198         }
 199 #ifdef CONFIG_RELOCATABLE
 200         . = ALIGN(8);
 201         .dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET) { *(.dynsym) }
 202         .dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
 203         .dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
 204         {
 205                 __dynamic_start = .;
 206                 *(.dynamic)
 207         }
 208         .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
 209         .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
 210         .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
 211         {
 212                 __rela_dyn_start = .;
 213                 *(.rela*)
 214         }
 215 #endif
 216
 217         /* freed after init ends here */
 218         . = ALIGN(PAGE_SIZE);
 219         __init_end = .;
 220
 221 /*
 222  * And now the various read/write data
 223  */
 224
 225         . = ALIGN(PAGE_SIZE);
 226         _sdata = .;
 227
 228 #ifdef CONFIG_PPC32
 229         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 230                 DATA_DATA
 231                 *(.sdata)
 232                 *(.got.plt) *(.got)
 233         }
 234 #else
 235         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 236                 DATA_DATA
 237                 *(.data.rel*)
 238                 *(.toc1)
 239                 *(.branch_lt)
 240         }
 241
 242         .opd : AT(ADDR(.opd) - LOAD_OFFSET) {
 243                 *(.opd)
 244         }
 245
 246         .got : AT(ADDR(.got) - LOAD_OFFSET) {
 247                 __toc_start = .;
 248                 *(.got)
 249                 *(.toc)
 250         }
 251 #endif
 252
 253         . = ALIGN(PAGE_SIZE);
 254         _edata  =  .;
 255         PROVIDE32 (edata = .);
 256
 257         /* The initial task and kernel stack */
 258 #ifdef CONFIG_PPC32
 259         . = ALIGN(8192);
 260 #else
 261         . = ALIGN(16384);
 262 #endif
 263         .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
 264                 *(.data.init_task)
 265         }
 266
 267         . = ALIGN(PAGE_SIZE);
 268         .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
 269                 *(.data.page_aligned)
 270         }
 271
 272         .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
 273                 *(.data.cacheline_aligned)
 274         }
 275
 276         . = ALIGN(L1_CACHE_BYTES);
 277         .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
 278                 *(.data.read_mostly)
 279         }
 280
 281         . = ALIGN(PAGE_SIZE);
 282         .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
 283                 __nosave_begin = .;
 284                 *(.data.nosave)
 285                 . = ALIGN(PAGE_SIZE);
 286                 __nosave_end = .;
 287         }
 288
 289 /*
 290  * And finally the bss
 291  */
 292
 293         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 294                 __bss_start = .;
 295                 *(.sbss) *(.scommon)
 296                 *(.dynbss)
 297                 *(.bss)
 298                 *(COMMON)
 299                 __bss_stop = .;
 300         }
 301
 302         . = ALIGN(PAGE_SIZE);
 303         _end = . ;
 304         PROVIDE32 (end = .);
 305 }