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                 HEAD_TEXT
  56                 _text = .;
  57                 /* careful! __ftr_alt_* sections need to be close to .text */
  58                 *(.text .fixup __ftr_alt_* .ref.text)
  59                 SCHED_TEXT
  60                 LOCK_TEXT
  61                 KPROBES_TEXT
  62                 IRQENTRY_TEXT
  63
  64 #ifdef CONFIG_PPC32
  65                 *(.got1)
  66                 __got2_start = .;
  67                 *(.got2)
  68                 __got2_end = .;
  69 #endif /* CONFIG_PPC32 */
  70
  71         } :kernel
  72
  73         . = ALIGN(PAGE_SIZE);
  74         _etext = .;
  75         PROVIDE32 (etext = .);
  76
  77         /* Read-only data */
  78         RODATA
  79
  80         /* Exception & bug tables */
  81         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
  82                 __start___ex_table = .;
  83                 *(__ex_table)
  84                 __stop___ex_table = .;
  85         }
  86
  87         NOTES :kernel :notes
  88
  89         /* The dummy segment contents for the bug workaround mentioned above
  90            near PHDRS.  */
  91         .dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
  92                 LONG(0)
  93                 LONG(0)
  94                 LONG(0)
  95         } :kernel :dummy
  96
  97 /*
  98  * Init sections discarded at runtime
  99  */
 100         . = ALIGN(PAGE_SIZE);
 101         __init_begin = .;
 102
 103         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
 104                 _sinittext = .;
 105                 INIT_TEXT
 106                 _einittext = .;
 107         } :kernel
 108
 109         /* .exit.text is discarded at runtime, not link time,
 110          * to deal with references from __bug_table
 111          */
 112         .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
 113                 EXIT_TEXT
 114         }
 115
 116         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
 117                 INIT_DATA
 118                 __vtop_table_begin = .;
 119                 *(.vtop_fixup);
 120                 __vtop_table_end = .;
 121                 __ptov_table_begin = .;
 122                 *(.ptov_fixup);
 123                 __ptov_table_end = .;
 124 #ifdef CONFIG_PPC_ISERIES
 125                 __dt_strings_start = .;
 126                 *(.dt_strings);
 127                 __dt_strings_end = .;
 128 #endif
 129         }
 130
 131         . = ALIGN(16);
 132         .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 133                 __setup_start = .;
 134                 *(.init.setup)
 135                 __setup_end = .;
 136         }
 137
 138         .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 139                 __initcall_start = .;
 140                 INITCALLS
 141                 __initcall_end = .;
 142                 }
 143
 144         .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 145                 __con_initcall_start = .;
 146                 *(.con_initcall.init)
 147                 __con_initcall_end = .;
 148         }
 149
 150         SECURITY_INIT
 151
 152         . = ALIGN(8);
 153         __ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
 154                 __start___ftr_fixup = .;
 155                 *(__ftr_fixup)
 156                 __stop___ftr_fixup = .;
 157         }
 158         . = ALIGN(8);
 159         __mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
 160                 __start___mmu_ftr_fixup = .;
 161                 *(__mmu_ftr_fixup)
 162                 __stop___mmu_ftr_fixup = .;
 163         }
 164         . = ALIGN(8);
 165         __lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
 166                 __start___lwsync_fixup = .;
 167                 *(__lwsync_fixup)
 168                 __stop___lwsync_fixup = .;
 169         }
 170 #ifdef CONFIG_PPC64
 171         . = ALIGN(8);
 172         __fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
 173                 __start___fw_ftr_fixup = .;
 174                 *(__fw_ftr_fixup)
 175                 __stop___fw_ftr_fixup = .;
 176         }
 177 #endif
 178 #ifdef CONFIG_BLK_DEV_INITRD
 179         . = ALIGN(PAGE_SIZE);
 180         .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 181                 __initramfs_start = .;
 182                 *(.init.ramfs)
 183                 __initramfs_end = .;
 184         }
 185 #endif
 186         PERCPU(PAGE_SIZE)
 187
 188         . = ALIGN(8);
 189         .machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
 190                 __machine_desc_start = . ;
 191                 *(.machine.desc)
 192                 __machine_desc_end = . ;
 193         }
 194 #ifdef CONFIG_RELOCATABLE
 195         . = ALIGN(8);
 196         .dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET) { *(.dynsym) }
 197         .dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
 198         .dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
 199         {
 200                 __dynamic_start = .;
 201                 *(.dynamic)
 202         }
 203         .hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
 204         .interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
 205         .rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
 206         {
 207                 __rela_dyn_start = .;
 208                 *(.rela*)
 209         }
 210 #endif
 211
 212         /* freed after init ends here */
 213         . = ALIGN(PAGE_SIZE);
 214         __init_end = .;
 215
 216 /*
 217  * And now the various read/write data
 218  */
 219
 220         . = ALIGN(PAGE_SIZE);
 221         _sdata = .;
 222
 223 #ifdef CONFIG_PPC32
 224         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 225                 DATA_DATA
 226                 *(.sdata)
 227                 *(.got.plt) *(.got)
 228         }
 229 #else
 230         .data : AT(ADDR(.data) - LOAD_OFFSET) {
 231                 DATA_DATA
 232                 *(.data.rel*)
 233                 *(.toc1)
 234                 *(.branch_lt)
 235         }
 236
 237         .opd : AT(ADDR(.opd) - LOAD_OFFSET) {
 238                 *(.opd)
 239         }
 240
 241         .got : AT(ADDR(.got) - LOAD_OFFSET) {
 242                 __toc_start = .;
 243                 *(.got)
 244                 *(.toc)
 245         }
 246 #endif
 247
 248         . = ALIGN(PAGE_SIZE);
 249         _edata  =  .;
 250         PROVIDE32 (edata = .);
 251
 252         /* The initial task and kernel stack */
 253 #ifdef CONFIG_PPC32
 254         . = ALIGN(8192);
 255 #else
 256         . = ALIGN(16384);
 257 #endif
 258         .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
 259                 *(.data.init_task)
 260         }
 261
 262         . = ALIGN(PAGE_SIZE);
 263         .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
 264                 *(.data.page_aligned)
 265         }
 266
 267         . = ALIGN(L1_CACHE_BYTES);
 268         .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
 269                 *(.data.cacheline_aligned)
 270         }
 271
 272         . = ALIGN(L1_CACHE_BYTES);
 273         .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
 274                 *(.data.read_mostly)
 275         }
 276
 277         . = ALIGN(PAGE_SIZE);
 278         .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
 279                 __nosave_begin = .;
 280                 *(.data.nosave)
 281                 . = ALIGN(PAGE_SIZE);
 282                 __nosave_end = .;
 283         }
 284
 285 /*
 286  * And finally the bss
 287  */
 288
 289         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 290                 __bss_start = .;
 291                 *(.sbss) *(.scommon)
 292                 *(.dynbss)
 293                 *(.bss)
 294                 *(COMMON)
 295                 __bss_stop = .;
 296         }
 297
 298         . = ALIGN(PAGE_SIZE);
 299         _end = . ;
 300         PROVIDE32 (end = .);
 301 }