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         . = 0;
  42         reloc_start = .;
  43
  44         . = KERNELBASE;
  45
  46 /*
  47  * Text, read only data and other permanent read-only sections
  48  */
  49
  50         /* Text and gots */
  51         .text : AT(ADDR(.text) - LOAD_OFFSET) {
  52                 ALIGN_FUNCTION();
  53                 HEAD_TEXT
  54                 _text = .;
  55                 /* careful! __ftr_alt_* sections need to be close to .text */
  56                 *(.text .fixup __ftr_alt_* .ref.text)
  57                 SCHED_TEXT
  58                 LOCK_TEXT
  59                 KPROBES_TEXT
  60                 IRQENTRY_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_TABLE(0)
  79
  80         NOTES :kernel :notes
  81
  82         /* The dummy segment contents for the bug workaround mentioned above
  83            near PHDRS.  */
  84         .dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
  85                 LONG(0)
  86                 LONG(0)
  87                 LONG(0)
  88         } :kernel :dummy
  89
  90 /*
  91  * Init sections discarded at runtime
  92  */
  93         . = ALIGN(PAGE_SIZE);
  94         __init_begin = .;
  95         INIT_TEXT_SECTION(PAGE_SIZE) :kernel
  96
  97         /* .exit.text is discarded at runtime, not link time,
  98          * to deal with references from __bug_table
  99          */
 100         .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
 101                 EXIT_TEXT
 102         }
 103
 104         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
 105                 INIT_DATA
 106                 __vtop_table_begin = .;
 107                 *(.vtop_fixup);
 108                 __vtop_table_end = .;
 109                 __ptov_table_begin = .;
 110                 *(.ptov_fixup);
 111                 __ptov_table_end = .;
 112 #ifdef CONFIG_PPC_ISERIES
 113                 __dt_strings_start = .;
 114                 *(.dt_strings);
 115                 __dt_strings_end = .;
 116 #endif
 117         }
 118
 119         .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 120                 INIT_SETUP(16)
 121         }
 122
 123         .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 124                 INIT_CALLS
 125         }
 126
 127         .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 128                 CON_INITCALL
 129         }
 130
 131         SECURITY_INIT
 132
 133         . = ALIGN(8);
 134         __ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
 135                 __start___ftr_fixup = .;
 136                 *(__ftr_fixup)
 137                 __stop___ftr_fixup = .;
 138         }
 139         . = ALIGN(8);
 140         __mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
 141                 __start___mmu_ftr_fixup = .;
 142                 *(__mmu_ftr_fixup)
 143                 __stop___mmu_ftr_fixup = .;
 144         }
 145         . = ALIGN(8);
 146         __lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
 147                 __start___lwsync_fixup = .;
 148                 *(__lwsync_fixup)
 149                 __stop___lwsync_fixup = .;
 150         }
 151 #ifdef CONFIG_PPC64
 152         . = ALIGN(8);
 153         __fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
 154                 __start___fw_ftr_fixup = .;
 155                 *(__fw_ftr_fixup)
 156                 __stop___fw_ftr_fixup = .;
 157         }
 158 #endif
 159         .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 160                 INIT_RAM_FS
 161         }
 162
 163         PERCPU(PAGE_SIZE)
 164
 165         . = ALIGN(8);
 166         .machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
 167                 __machine_desc_start = . ;
 168                 *(.machine.desc)
 169                 __machine_desc_end = . ;
 170         }
 171 #ifdef CONFIG_RELOCATABLE
 172         . = ALIGN(8);
 173         .dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET) { *(.dynsym) }
 174         .dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
 175         .dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
 176         {
 177                 __dynamic_start = .;
 178                 *(.dynamic)
 179         }
 180         .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
 181         .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
 182         .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
 183         {
 184                 __rela_dyn_start = .;
 185                 *(.rela*)
 186         }
 187 #endif
 188
 189         /* freed after init ends here */
 190         . = ALIGN(PAGE_SIZE);
 191         __init_end = .;
 192
 193 /*
 194  * And now the various read/write data
 195  */
 196
 197         . = ALIGN(PAGE_SIZE);
 198         _sdata = .;
 199
 200 #ifdef CONFIG_PPC32
 201         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 202                 DATA_DATA
 203                 *(.sdata)
 204                 *(.got.plt) *(.got)
 205         }
 206 #else
 207         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 208                 DATA_DATA
 209                 *(.data.rel*)
 210                 *(.toc1)
 211                 *(.branch_lt)
 212         }
 213
 214         .opd : AT(ADDR(.opd) - LOAD_OFFSET) {
 215                 *(.opd)
 216         }
 217
 218         .got : AT(ADDR(.got) - LOAD_OFFSET) {
 219                 __toc_start = .;
 220                 *(.got)
 221                 *(.toc)
 222         }
 223 #endif
 224
 225         /* The initial task and kernel stack */
 226         INIT_TASK_DATA_SECTION(THREAD_SIZE)
 227
 228         .data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
 229                 PAGE_ALIGNED_DATA(PAGE_SIZE)
 230         }
 231
 232         .data..cacheline_aligned : AT(ADDR(.data..cacheline_aligned) - LOAD_OFFSET) {
 233                 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
 234         }
 235
 236         .data..read_mostly : AT(ADDR(.data..read_mostly) - LOAD_OFFSET) {
 237                 READ_MOSTLY_DATA(L1_CACHE_BYTES)
 238         }
 239
 240         . = ALIGN(PAGE_SIZE);
 241         .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
 242                 NOSAVE_DATA
 243         }
 244
 245         . = ALIGN(PAGE_SIZE);
 246         _edata  =  .;
 247         PROVIDE32 (edata = .);
 248
 249 /*
 250  * And finally the bss
 251  */
 252
 253         BSS_SECTION(0, 0, 0)
 254
 255         . = ALIGN(PAGE_SIZE);
 256         _end = . ;
 257         PROVIDE32 (end = .);
 258
 259         /* Sections to be discarded. */
 260         DISCARDS
 261 }