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 #include <asm/thread_info.h>
  10
  11 ENTRY(_stext)
  12
  13 PHDRS {
  14         kernel PT_LOAD FLAGS(7); /* RWX */
  15         notes PT_NOTE FLAGS(0);
  16         dummy PT_NOTE FLAGS(0);
  17
  18         /* binutils < 2.18 has a bug that makes it misbehave when taking an
  19            ELF file with all segments at load address 0 as input.  This
  20            happens when running "strip" on vmlinux, because of the AT() magic
  21            in this linker script.  People using GCC >= 4.2 won't run into
  22            this problem, because the "build-id" support will put some data
  23            into the "notes" segment (at a non-zero load address).
  24
  25            To work around this, we force some data into both the "dummy"
  26            segment and the kernel segment, so the dummy segment will get a
  27            non-zero load address.  It's not enough to always create the
  28            "notes" segment, since if nothing gets assigned to it, its load
  29            address will be zero.  */
  30 }
  31
  32 #ifdef CONFIG_PPC64
  33 OUTPUT_ARCH(powerpc:common64)
  34 jiffies = jiffies_64;
  35 #else
  36 OUTPUT_ARCH(powerpc:common)
  37 jiffies = jiffies_64 + 4;
  38 #endif
  39 SECTIONS
  40 {
  41         . = KERNELBASE;
  42
  43 /*
  44  * Text, read only data and other permanent read-only sections
  45  */
  46
  47         /* Text and gots */
  48         .text : AT(ADDR(.text) - LOAD_OFFSET) {
  49                 ALIGN_FUNCTION();
  50                 HEAD_TEXT
  51                 _text = .;
  52                 /* careful! __ftr_alt_* sections need to be close to .text */
  53                 *(.text .fixup __ftr_alt_* .ref.text)
  54                 SCHED_TEXT
  55                 LOCK_TEXT
  56                 KPROBES_TEXT
  57                 IRQENTRY_TEXT
  58                 SOFTIRQENTRY_TEXT
  59
  60 #ifdef CONFIG_PPC32
  61                 *(.got1)
  62                 __got2_start = .;
  63                 *(.got2)
  64                 __got2_end = .;
  65 #endif /* CONFIG_PPC32 */
  66
  67         } :kernel
  68
  69         . = ALIGN(PAGE_SIZE);
  70         _etext = .;
  71         PROVIDE32 (etext = .);
  72
  73         /* Read-only data */
  74         RODATA
  75
  76         EXCEPTION_TABLE(0)
  77
  78         NOTES :kernel :notes
  79
  80         /* The dummy segment contents for the bug workaround mentioned above
  81            near PHDRS.  */
  82         .dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
  83                 LONG(0)
  84                 LONG(0)
  85                 LONG(0)
  86         } :kernel :dummy
  87
  88 /*
  89  * Init sections discarded at runtime
  90  */
  91         . = ALIGN(PAGE_SIZE);
  92         __init_begin = .;
  93         INIT_TEXT_SECTION(PAGE_SIZE) :kernel
  94
  95         /* .exit.text is discarded at runtime, not link time,
  96          * to deal with references from __bug_table
  97          */
  98         .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
  99                 EXIT_TEXT
 100         }
 101
 102         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
 103                 INIT_DATA
 104                 __vtop_table_begin = .;
 105                 *(.vtop_fixup);
 106                 __vtop_table_end = .;
 107                 __ptov_table_begin = .;
 108                 *(.ptov_fixup);
 109                 __ptov_table_end = .;
 110         }
 111
 112         .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 113                 INIT_SETUP(16)
 114         }
 115
 116         .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 117                 INIT_CALLS
 118         }
 119
 120         .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 121                 CON_INITCALL
 122         }
 123
 124         SECURITY_INIT
 125
 126         . = ALIGN(8);
 127         __ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
 128                 __start___ftr_fixup = .;
 129                 *(__ftr_fixup)
 130                 __stop___ftr_fixup = .;
 131         }
 132         . = ALIGN(8);
 133         __mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
 134                 __start___mmu_ftr_fixup = .;
 135                 *(__mmu_ftr_fixup)
 136                 __stop___mmu_ftr_fixup = .;
 137         }
 138         . = ALIGN(8);
 139         __lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
 140                 __start___lwsync_fixup = .;
 141                 *(__lwsync_fixup)
 142                 __stop___lwsync_fixup = .;
 143         }
 144 #ifdef CONFIG_PPC64
 145         . = ALIGN(8);
 146         __fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
 147                 __start___fw_ftr_fixup = .;
 148                 *(__fw_ftr_fixup)
 149                 __stop___fw_ftr_fixup = .;
 150         }
 151 #endif
 152         .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 153                 INIT_RAM_FS
 154         }
 155
 156         PERCPU_SECTION(L1_CACHE_BYTES)
 157
 158         . = ALIGN(8);
 159         .machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
 160                 __machine_desc_start = . ;
 161                 *(.machine.desc)
 162                 __machine_desc_end = . ;
 163         }
 164 #ifdef CONFIG_RELOCATABLE
 165         . = ALIGN(8);
 166         .dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET)
 167         {
 168 #ifdef CONFIG_RELOCATABLE_PPC32
 169                 __dynamic_symtab = .;
 170 #endif
 171                 *(.dynsym)
 172         }
 173         .dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
 174         .dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
 175         {
 176                 __dynamic_start = .;
 177                 *(.dynamic)
 178         }
 179         .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
 180         .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
 181         .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
 182         {
 183                 __rela_dyn_start = .;
 184                 *(.rela*)
 185         }
 186 #endif
 187         /* .exit.data is discarded at runtime, not link time,
 188          * to deal with references from .exit.text
 189          */
 190         .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
 191                 EXIT_DATA
 192         }
 193
 194         /* freed after init ends here */
 195         . = ALIGN(PAGE_SIZE);
 196         __init_end = .;
 197
 198 /*
 199  * And now the various read/write data
 200  */
 201
 202         . = ALIGN(PAGE_SIZE);
 203         _sdata = .;
 204
 205 #ifdef CONFIG_PPC32
 206         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 207                 DATA_DATA
 208                 *(.sdata)
 209                 *(.got.plt) *(.got)
 210         }
 211 #else
 212         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 213                 DATA_DATA
 214                 *(.data.rel*)
 215                 *(.toc1)
 216                 *(.branch_lt)
 217         }
 218
 219         .opd : AT(ADDR(.opd) - LOAD_OFFSET) {
 220                 *(.opd)
 221         }
 222
 223         . = ALIGN(256);
 224         .got : AT(ADDR(.got) - LOAD_OFFSET) {
 225                 __toc_start = .;
 226 #ifndef CONFIG_RELOCATABLE
 227                 __prom_init_toc_start = .;
 228                 arch/powerpc/kernel/prom_init.o*(.toc .got)
 229                 __prom_init_toc_end = .;
 230 #endif
 231                 *(.got)
 232                 *(.toc)
 233         }
 234 #endif
 235
 236         /* The initial task and kernel stack */
 237         INIT_TASK_DATA_SECTION(THREAD_SIZE)
 238
 239         .data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
 240                 PAGE_ALIGNED_DATA(PAGE_SIZE)
 241         }
 242
 243         .data..cacheline_aligned : AT(ADDR(.data..cacheline_aligned) - LOAD_OFFSET) {
 244                 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
 245         }
 246
 247         .data..read_mostly : AT(ADDR(.data..read_mostly) - LOAD_OFFSET) {
 248                 READ_MOSTLY_DATA(L1_CACHE_BYTES)
 249         }
 250
 251         . = ALIGN(PAGE_SIZE);
 252         .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
 253                 NOSAVE_DATA
 254         }
 255
 256         . = ALIGN(PAGE_SIZE);
 257         _edata  =  .;
 258         PROVIDE32 (edata = .);
 259
 260 /*
 261  * And finally the bss
 262  */
 263
 264         BSS_SECTION(0, 0, 0)
 265
 266         . = ALIGN(PAGE_SIZE);
 267         _end = . ;
 268         PROVIDE32 (end = .);
 269
 270         /* Sections to be discarded. */
 271         DISCARDS
 272 }