| 1 | |
| 2 | * Helper macros to support writing architecture specific
|
| 3 | * linker scripts.
|
| 4 | *
|
| 5 | * A minimal linker scripts has following content:
|
| 6 | * [This is a sample, architectures may have special requiriements]
|
| 7 | *
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| 8 | * OUTPUT_FORMAT(...)
|
| 9 | * OUTPUT_ARCH(...)
|
| 10 | * ENTRY(...)
|
| 11 | * SECTIONS
|
| 12 | * {
|
| 13 | * . = START;
|
| 14 | * __init_begin = .;
|
| 15 | * HEAD_TEXT_SECTION
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| 16 | * INIT_TEXT_SECTION(PAGE_SIZE)
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| 17 | * INIT_DATA_SECTION(...)
|
| 18 | * PERCPU_SECTION(CACHELINE_SIZE)
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| 19 | * __init_end = .;
|
| 20 | *
|
| 21 | * _stext = .;
|
| 22 | * TEXT_SECTION = 0
|
| 23 | * _etext = .;
|
| 24 | *
|
| 25 | * _sdata = .;
|
| 26 | * RO_DATA_SECTION(PAGE_SIZE)
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| 27 | * RW_DATA_SECTION(...)
|
| 28 | * _edata = .;
|
| 29 | *
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| 30 | * EXCEPTION_TABLE(...)
|
| 31 | * NOTES
|
| 32 | *
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| 33 | * BSS_SECTION(0, 0, 0)
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| 34 | * _end = .;
|
| 35 | *
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| 36 | * STABS_DEBUG
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| 37 | * DWARF_DEBUG
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| 38 | *
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| 39 | * DISCARDS // must be the last
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| 40 | * }
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| 41 | *
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| 42 | * [__init_begin, __init_end] is the init section that may be freed after init
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| 43 | * [_stext, _etext] is the text section
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| 44 | * [_sdata, _edata] is the data section
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| 45 | *
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| 46 | * Some of the included output section have their own set of constants.
|
| 47 | * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
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| 48 | * [__nosave_begin, __nosave_end] for the nosave data
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| 49 |
|
| 50 |
|
| 51 | #ifndef LOAD_OFFSET
|
| 52 | #define LOAD_OFFSET 0
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| 53 | #endif
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| 54 |
|
| 55 | #ifndef SYMBOL_PREFIX
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| 56 | #define VMLINUX_SYMBOL(sym) sym
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| 57 | #else
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| 58 | #define PASTE2(x,y) x##y
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| 59 | #define PASTE(x,y) PASTE2(x,y)
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| 60 | #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
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| 61 | #endif
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| 62 |
|
| 63 |
|
| 64 | #define ALIGN_FUNCTION() . = ALIGN(8)
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| 65 |
|
| 66 | |
| 67 | * Align to a 32 byte boundary equal to the
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| 68 | * alignment gcc 4.5 uses for a struct
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| 69 |
|
| 70 | #define STRUCT_ALIGNMENT 32
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| 71 | #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
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| 72 |
|
| 73 | |
| 74 | * are handled as text/data or they can be discarded (which
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| 75 | * often happens at runtime)
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| 76 |
|
| 77 | #ifdef CONFIG_HOTPLUG
|
| 78 | #define DEV_KEEP(sec) *(.dev##sec)
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| 79 | #define DEV_DISCARD(sec)
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| 80 | #else
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| 81 | #define DEV_KEEP(sec)
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| 82 | #define DEV_DISCARD(sec) *(.dev##sec)
|
| 83 | #endif
|
| 84 |
|
| 85 | #ifdef CONFIG_HOTPLUG_CPU
|
| 86 | #define CPU_KEEP(sec) *(.cpu##sec)
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| 87 | #define CPU_DISCARD(sec)
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| 88 | #else
|
| 89 | #define CPU_KEEP(sec)
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| 90 | #define CPU_DISCARD(sec) *(.cpu##sec)
|
| 91 | #endif
|
| 92 |
|
| 93 | #if defined(CONFIG_MEMORY_HOTPLUG)
|
| 94 | #define MEM_KEEP(sec) *(.mem##sec)
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| 95 | #define MEM_DISCARD(sec)
|
| 96 | #else
|
| 97 | #define MEM_KEEP(sec)
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| 98 | #define MEM_DISCARD(sec) *(.mem##sec)
|
| 99 | #endif
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| 100 |
|
| 101 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD
|
| 102 | #define MCOUNT_REC() . = ALIGN(8); \
|
| 103 | VMLINUX_SYMBOL(__start_mcount_loc) = .; \
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| 104 | *(__mcount_loc) \
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| 105 | VMLINUX_SYMBOL(__stop_mcount_loc) = .;
|
| 106 | #else
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| 107 | #define MCOUNT_REC()
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| 108 | #endif
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| 109 |
|
| 110 | #ifdef CONFIG_TRACE_BRANCH_PROFILING
|
| 111 | #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
|
| 112 | *(_ftrace_annotated_branch) \
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| 113 | VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
|
| 114 | #else
|
| 115 | #define LIKELY_PROFILE()
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| 116 | #endif
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| 117 |
|
| 118 | #ifdef CONFIG_PROFILE_ALL_BRANCHES
|
| 119 | #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
|
| 120 | *(_ftrace_branch) \
|
| 121 | VMLINUX_SYMBOL(__stop_branch_profile) = .;
|
| 122 | #else
|
| 123 | #define BRANCH_PROFILE()
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| 124 | #endif
|
| 125 |
|
| 126 | #ifdef CONFIG_EVENT_TRACING
|
| 127 | #define FTRACE_EVENTS() . = ALIGN(8); \
|
| 128 | VMLINUX_SYMBOL(__start_ftrace_events) = .; \
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| 129 | *(_ftrace_events) \
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| 130 | VMLINUX_SYMBOL(__stop_ftrace_events) = .;
|
| 131 | #else
|
| 132 | #define FTRACE_EVENTS()
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| 133 | #endif
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| 134 |
|
| 135 | #ifdef CONFIG_TRACING
|
| 136 | #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
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| 137 | *(__trace_printk_fmt) \
|
| 138 | VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
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| 139 | #else
|
| 140 | #define TRACE_PRINTKS()
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| 141 | #endif
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| 142 |
|
| 143 | #ifdef CONFIG_FTRACE_SYSCALLS
|
| 144 | #define TRACE_SYSCALLS() . = ALIGN(8); \
|
| 145 | VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
|
| 146 | *(__syscalls_metadata) \
|
| 147 | VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
|
| 148 | #else
|
| 149 | #define TRACE_SYSCALLS()
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| 150 | #endif
|
| 151 |
|
| 152 |
|
| 153 | #define KERNEL_DTB() \
|
| 154 | STRUCT_ALIGN(); \
|
| 155 | VMLINUX_SYMBOL(__dtb_start) = .; \
|
| 156 | *(.dtb.init.rodata) \
|
| 157 | VMLINUX_SYMBOL(__dtb_end) = .;
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| 158 |
|
| 159 |
|
| 160 | #define DATA_DATA \
|
| 161 | *(.data) \
|
| 162 | *(.ref.data) \
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| 163 | *(.data..shared_aligned) \
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| 164 | DEV_KEEP(init.data) \
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| 165 | DEV_KEEP(exit.data) \
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| 166 | CPU_KEEP(init.data) \
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| 167 | CPU_KEEP(exit.data) \
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| 168 | MEM_KEEP(init.data) \
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| 169 | MEM_KEEP(exit.data) \
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| 170 | STRUCT_ALIGN(); \
|
| 171 | *(__tracepoints) \
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| 172 | \
|
| 173 | . = ALIGN(8); \
|
| 174 | VMLINUX_SYMBOL(__start___jump_table) = .; \
|
| 175 | *(__jump_table) \
|
| 176 | VMLINUX_SYMBOL(__stop___jump_table) = .; \
|
| 177 | . = ALIGN(8); \
|
| 178 | VMLINUX_SYMBOL(__start___verbose) = .; \
|
| 179 | *(__verbose) \
|
| 180 | VMLINUX_SYMBOL(__stop___verbose) = .; \
|
| 181 | LIKELY_PROFILE() \
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| 182 | BRANCH_PROFILE() \
|
| 183 | TRACE_PRINTKS()
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| 184 |
|
| 185 | |
| 186 | * Data section helpers
|
| 187 |
|
| 188 | #define NOSAVE_DATA \
|
| 189 | . = ALIGN(PAGE_SIZE); \
|
| 190 | VMLINUX_SYMBOL(__nosave_begin) = .; \
|
| 191 | *(.data..nosave) \
|
| 192 | . = ALIGN(PAGE_SIZE); \
|
| 193 | VMLINUX_SYMBOL(__nosave_end) = .;
|
| 194 |
|
| 195 | #define PAGE_ALIGNED_DATA(page_align) \
|
| 196 | . = ALIGN(page_align); \
|
| 197 | *(.data..page_aligned)
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| 198 |
|
| 199 | #define READ_MOSTLY_DATA(align) \
|
| 200 | . = ALIGN(align); \
|
| 201 | *(.data..read_mostly) \
|
| 202 | . = ALIGN(align);
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| 203 |
|
| 204 | #define CACHELINE_ALIGNED_DATA(align) \
|
| 205 | . = ALIGN(align); \
|
| 206 | *(.data..cacheline_aligned)
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| 207 |
|
| 208 | #define INIT_TASK_DATA(align) \
|
| 209 | . = ALIGN(align); \
|
| 210 | *(.data..init_task)
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| 211 |
|
| 212 | |
| 213 | * Read only Data
|
| 214 |
|
| 215 | #define RO_DATA_SECTION(align) \
|
| 216 | . = ALIGN((align)); \
|
| 217 | .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
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| 218 | VMLINUX_SYMBOL(__start_rodata) = .; \
|
| 219 | *(.rodata) *(.rodata.*) \
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| 220 | *(__vermagic) \
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| 221 | . = ALIGN(8); \
|
| 222 | VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
|
| 223 | *(__tracepoints_ptrs) \
|
| 224 | VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
|
| 225 | *(__tracepoints_strings) \
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| 226 | } \
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| 227 | \
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| 228 | .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
|
| 229 | *(.rodata1) \
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| 230 | } \
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| 231 | \
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| 232 | BUG_TABLE \
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| 233 | \
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| 234 | \
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| 235 | .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
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| 236 | VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
|
| 237 | *(.pci_fixup_early) \
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| 238 | VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
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| 239 | VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
|
| 240 | *(.pci_fixup_header) \
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| 241 | VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
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| 242 | VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
|
| 243 | *(.pci_fixup_final) \
|
| 244 | VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
|
| 245 | VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
|
| 246 | *(.pci_fixup_enable) \
|
| 247 | VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
|
| 248 | VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
|
| 249 | *(.pci_fixup_resume) \
|
| 250 | VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
|
| 251 | VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
|
| 252 | *(.pci_fixup_resume_early) \
|
| 253 | VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
|
| 254 | VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
|
| 255 | *(.pci_fixup_suspend) \
|
| 256 | VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
|
| 257 | } \
|
| 258 | \
|
| 259 | \
|
| 260 | .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
|
| 261 | VMLINUX_SYMBOL(__start_builtin_fw) = .; \
|
| 262 | *(.builtin_fw) \
|
| 263 | VMLINUX_SYMBOL(__end_builtin_fw) = .; \
|
| 264 | } \
|
| 265 | \
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| 266 | \
|
| 267 | .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \
|
| 268 | VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \
|
| 269 | *(.rio_switch_ops) \
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| 270 | VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \
|
| 271 | } \
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| 272 | \
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| 273 | TRACEDATA \
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| 274 | \
|
| 275 | \
|
| 276 | __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
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| 277 | VMLINUX_SYMBOL(__start___ksymtab) = .; \
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| 278 | *(SORT(___ksymtab+*)) \
|
| 279 | VMLINUX_SYMBOL(__stop___ksymtab) = .; \
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| 280 | } \
|
| 281 | \
|
| 282 | \
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| 283 | __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
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| 284 | VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
|
| 285 | *(SORT(___ksymtab_gpl+*)) \
|
| 286 | VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
|
| 287 | } \
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| 288 | \
|
| 289 | \
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| 290 | __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
|
| 291 | VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
|
| 292 | *(SORT(___ksymtab_unused+*)) \
|
| 293 | VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
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| 294 | } \
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| 295 | \
|
| 296 | \
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| 297 | __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
|
| 298 | VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
|
| 299 | *(SORT(___ksymtab_unused_gpl+*)) \
|
| 300 | VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
|
| 301 | } \
|
| 302 | \
|
| 303 | \
|
| 304 | __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
|
| 305 | VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
|
| 306 | *(SORT(___ksymtab_gpl_future+*)) \
|
| 307 | VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
|
| 308 | } \
|
| 309 | \
|
| 310 | \
|
| 311 | __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
|
| 312 | VMLINUX_SYMBOL(__start___kcrctab) = .; \
|
| 313 | *(SORT(___kcrctab+*)) \
|
| 314 | VMLINUX_SYMBOL(__stop___kcrctab) = .; \
|
| 315 | } \
|
| 316 | \
|
| 317 | \
|
| 318 | __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
|
| 319 | VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
|
| 320 | *(SORT(___kcrctab_gpl+*)) \
|
| 321 | VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
|
| 322 | } \
|
| 323 | \
|
| 324 | \
|
| 325 | __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
|
| 326 | VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
|
| 327 | *(SORT(___kcrctab_unused+*)) \
|
| 328 | VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
|
| 329 | } \
|
| 330 | \
|
| 331 | \
|
| 332 | __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
|
| 333 | VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
|
| 334 | *(SORT(___kcrctab_unused_gpl+*)) \
|
| 335 | VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
|
| 336 | } \
|
| 337 | \
|
| 338 | \
|
| 339 | __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
|
| 340 | VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
|
| 341 | *(SORT(___kcrctab_gpl_future+*)) \
|
| 342 | VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
|
| 343 | } \
|
| 344 | \
|
| 345 | \
|
| 346 | __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
|
| 347 | *(__ksymtab_strings) \
|
| 348 | } \
|
| 349 | \
|
| 350 | \
|
| 351 | __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
|
| 352 | *(.ref.rodata) \
|
| 353 | DEV_KEEP(init.rodata) \
|
| 354 | DEV_KEEP(exit.rodata) \
|
| 355 | CPU_KEEP(init.rodata) \
|
| 356 | CPU_KEEP(exit.rodata) \
|
| 357 | MEM_KEEP(init.rodata) \
|
| 358 | MEM_KEEP(exit.rodata) \
|
| 359 | } \
|
| 360 | \
|
| 361 | \
|
| 362 | __param : AT(ADDR(__param) - LOAD_OFFSET) { \
|
| 363 | VMLINUX_SYMBOL(__start___param) = .; \
|
| 364 | *(__param) \
|
| 365 | VMLINUX_SYMBOL(__stop___param) = .; \
|
| 366 | } \
|
| 367 | \
|
| 368 | \
|
| 369 | __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
|
| 370 | VMLINUX_SYMBOL(__start___modver) = .; \
|
| 371 | *(__modver) \
|
| 372 | VMLINUX_SYMBOL(__stop___modver) = .; \
|
| 373 | . = ALIGN((align)); \
|
| 374 | VMLINUX_SYMBOL(__end_rodata) = .; \
|
| 375 | } \
|
| 376 | . = ALIGN((align));
|
| 377 |
|
| 378 | |
| 379 | * All archs are supposed to use RO_DATA()
|
| 380 | #define RODATA RO_DATA_SECTION(4096)
|
| 381 | #define RO_DATA(align) RO_DATA_SECTION(align)
|
| 382 |
|
| 383 | #define SECURITY_INIT \
|
| 384 | .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
|
| 385 | VMLINUX_SYMBOL(__security_initcall_start) = .; \
|
| 386 | *(.security_initcall.init) \
|
| 387 | VMLINUX_SYMBOL(__security_initcall_end) = .; \
|
| 388 | }
|
| 389 |
|
| 390 | |
| 391 | * during second ld run in second ld pass when generating System.map
|
| 392 | #define TEXT_TEXT \
|
| 393 | ALIGN_FUNCTION(); \
|
| 394 | *(.text.hot) \
|
| 395 | *(.text) \
|
| 396 | *(.ref.text) \
|
| 397 | DEV_KEEP(init.text) \
|
| 398 | DEV_KEEP(exit.text) \
|
| 399 | CPU_KEEP(init.text) \
|
| 400 | CPU_KEEP(exit.text) \
|
| 401 | MEM_KEEP(init.text) \
|
| 402 | MEM_KEEP(exit.text) \
|
| 403 | *(.text.unlikely)
|
| 404 |
|
| 405 |
|
| 406 | |
| 407 | * address even at second ld pass when generating System.map
|
| 408 | #define SCHED_TEXT \
|
| 409 | ALIGN_FUNCTION(); \
|
| 410 | VMLINUX_SYMBOL(__sched_text_start) = .; \
|
| 411 | *(.sched.text) \
|
| 412 | VMLINUX_SYMBOL(__sched_text_end) = .;
|
| 413 |
|
| 414 | |
| 415 | * address even at second ld pass when generating System.map
|
| 416 | #define LOCK_TEXT \
|
| 417 | ALIGN_FUNCTION(); \
|
| 418 | VMLINUX_SYMBOL(__lock_text_start) = .; \
|
| 419 | *(.spinlock.text) \
|
| 420 | VMLINUX_SYMBOL(__lock_text_end) = .;
|
| 421 |
|
| 422 | #define KPROBES_TEXT \
|
| 423 | ALIGN_FUNCTION(); \
|
| 424 | VMLINUX_SYMBOL(__kprobes_text_start) = .; \
|
| 425 | *(.kprobes.text) \
|
| 426 | VMLINUX_SYMBOL(__kprobes_text_end) = .;
|
| 427 |
|
| 428 | #define ENTRY_TEXT \
|
| 429 | ALIGN_FUNCTION(); \
|
| 430 | VMLINUX_SYMBOL(__entry_text_start) = .; \
|
| 431 | *(.entry.text) \
|
| 432 | VMLINUX_SYMBOL(__entry_text_end) = .;
|
| 433 |
|
| 434 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
| 435 | #define IRQENTRY_TEXT \
|
| 436 | ALIGN_FUNCTION(); \
|
| 437 | VMLINUX_SYMBOL(__irqentry_text_start) = .; \
|
| 438 | *(.irqentry.text) \
|
| 439 | VMLINUX_SYMBOL(__irqentry_text_end) = .;
|
| 440 | #else
|
| 441 | #define IRQENTRY_TEXT
|
| 442 | #endif
|
| 443 |
|
| 444 |
|
| 445 | #define HEAD_TEXT *(.head.text)
|
| 446 |
|
| 447 | #define HEAD_TEXT_SECTION \
|
| 448 | .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
|
| 449 | HEAD_TEXT \
|
| 450 | }
|
| 451 |
|
| 452 | |
| 453 | * Exception table
|
| 454 |
|
| 455 | #define EXCEPTION_TABLE(align) \
|
| 456 | . = ALIGN(align); \
|
| 457 | __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
|
| 458 | VMLINUX_SYMBOL(__start___ex_table) = .; \
|
| 459 | *(__ex_table) \
|
| 460 | VMLINUX_SYMBOL(__stop___ex_table) = .; \
|
| 461 | }
|
| 462 |
|
| 463 | |
| 464 | * Init task
|
| 465 |
|
| 466 | #define INIT_TASK_DATA_SECTION(align) \
|
| 467 | . = ALIGN(align); \
|
| 468 | .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
|
| 469 | INIT_TASK_DATA(align) \
|
| 470 | }
|
| 471 |
|
| 472 | #ifdef CONFIG_CONSTRUCTORS
|
| 473 | #define KERNEL_CTORS() . = ALIGN(8); \
|
| 474 | VMLINUX_SYMBOL(__ctors_start) = .; \
|
| 475 | *(.ctors) \
|
| 476 | VMLINUX_SYMBOL(__ctors_end) = .;
|
| 477 | #else
|
| 478 | #define KERNEL_CTORS()
|
| 479 | #endif
|
| 480 |
|
| 481 |
|
| 482 | #define INIT_DATA \
|
| 483 | *(.init.data) \
|
| 484 | DEV_DISCARD(init.data) \
|
| 485 | CPU_DISCARD(init.data) \
|
| 486 | MEM_DISCARD(init.data) \
|
| 487 | KERNEL_CTORS() \
|
| 488 | *(.init.rodata) \
|
| 489 | MCOUNT_REC() \
|
| 490 | FTRACE_EVENTS() \
|
| 491 | TRACE_SYSCALLS() \
|
| 492 | DEV_DISCARD(init.rodata) \
|
| 493 | CPU_DISCARD(init.rodata) \
|
| 494 | MEM_DISCARD(init.rodata) \
|
| 495 | KERNEL_DTB()
|
| 496 |
|
| 497 | #define INIT_TEXT \
|
| 498 | *(.init.text) \
|
| 499 | DEV_DISCARD(init.text) \
|
| 500 | CPU_DISCARD(init.text) \
|
| 501 | MEM_DISCARD(init.text)
|
| 502 |
|
| 503 | #define EXIT_DATA \
|
| 504 | *(.exit.data) \
|
| 505 | DEV_DISCARD(exit.data) \
|
| 506 | DEV_DISCARD(exit.rodata) \
|
| 507 | CPU_DISCARD(exit.data) \
|
| 508 | CPU_DISCARD(exit.rodata) \
|
| 509 | MEM_DISCARD(exit.data) \
|
| 510 | MEM_DISCARD(exit.rodata)
|
| 511 |
|
| 512 | #define EXIT_TEXT \
|
| 513 | *(.exit.text) \
|
| 514 | DEV_DISCARD(exit.text) \
|
| 515 | CPU_DISCARD(exit.text) \
|
| 516 | MEM_DISCARD(exit.text)
|
| 517 |
|
| 518 | #define EXIT_CALL \
|
| 519 | *(.exitcall.exit)
|
| 520 |
|
| 521 | |
| 522 | * bss (Block Started by Symbol) - uninitialized data
|
| 523 | * zeroed during startup
|
| 524 |
|
| 525 | #define SBSS(sbss_align) \
|
| 526 | . = ALIGN(sbss_align); \
|
| 527 | .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
|
| 528 | *(.sbss) \
|
| 529 | *(.scommon) \
|
| 530 | }
|
| 531 |
|
| 532 | #define BSS(bss_align) \
|
| 533 | . = ALIGN(bss_align); \
|
| 534 | .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
|
| 535 | *(.bss..page_aligned) \
|
| 536 | *(.dynbss) \
|
| 537 | *(.bss) \
|
| 538 | *(COMMON) \
|
| 539 | }
|
| 540 |
|
| 541 | |
| 542 | * DWARF debug sections.
|
| 543 | * Symbols in the DWARF debugging sections are relative to
|
| 544 | * the beginning of the section so we begin them at 0.
|
| 545 |
|
| 546 | #define DWARF_DEBUG \
|
| 547 | \
|
| 548 | .debug 0 : { *(.debug) } \
|
| 549 | .line 0 : { *(.line) } \
|
| 550 | \
|
| 551 | .debug_srcinfo 0 : { *(.debug_srcinfo) } \
|
| 552 | .debug_sfnames 0 : { *(.debug_sfnames) } \
|
| 553 | \
|
| 554 | .debug_aranges 0 : { *(.debug_aranges) } \
|
| 555 | .debug_pubnames 0 : { *(.debug_pubnames) } \
|
| 556 | \
|
| 557 | .debug_info 0 : { *(.debug_info \
|
| 558 | .gnu.linkonce.wi.*) } \
|
| 559 | .debug_abbrev 0 : { *(.debug_abbrev) } \
|
| 560 | .debug_line 0 : { *(.debug_line) } \
|
| 561 | .debug_frame 0 : { *(.debug_frame) } \
|
| 562 | .debug_str 0 : { *(.debug_str) } \
|
| 563 | .debug_loc 0 : { *(.debug_loc) } \
|
| 564 | .debug_macinfo 0 : { *(.debug_macinfo) } \
|
| 565 | \
|
| 566 | .debug_weaknames 0 : { *(.debug_weaknames) } \
|
| 567 | .debug_funcnames 0 : { *(.debug_funcnames) } \
|
| 568 | .debug_typenames 0 : { *(.debug_typenames) } \
|
| 569 | .debug_varnames 0 : { *(.debug_varnames) } \
|
| 570 |
|
| 571 |
|
| 572 | #define STABS_DEBUG \
|
| 573 | .stab 0 : { *(.stab) } \
|
| 574 | .stabstr 0 : { *(.stabstr) } \
|
| 575 | .stab.excl 0 : { *(.stab.excl) } \
|
| 576 | .stab.exclstr 0 : { *(.stab.exclstr) } \
|
| 577 | .stab.index 0 : { *(.stab.index) } \
|
| 578 | .stab.indexstr 0 : { *(.stab.indexstr) } \
|
| 579 | .comment 0 : { *(.comment) }
|
| 580 |
|
| 581 | #ifdef CONFIG_GENERIC_BUG
|
| 582 | #define BUG_TABLE \
|
| 583 | . = ALIGN(8); \
|
| 584 | __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
|
| 585 | VMLINUX_SYMBOL(__start___bug_table) = .; \
|
| 586 | *(__bug_table) \
|
| 587 | VMLINUX_SYMBOL(__stop___bug_table) = .; \
|
| 588 | }
|
| 589 | #else
|
| 590 | #define BUG_TABLE
|
| 591 | #endif
|
| 592 |
|
| 593 | #ifdef CONFIG_PM_TRACE
|
| 594 | #define TRACEDATA \
|
| 595 | . = ALIGN(4); \
|
| 596 | .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
|
| 597 | VMLINUX_SYMBOL(__tracedata_start) = .; \
|
| 598 | *(.tracedata) \
|
| 599 | VMLINUX_SYMBOL(__tracedata_end) = .; \
|
| 600 | }
|
| 601 | #else
|
| 602 | #define TRACEDATA
|
| 603 | #endif
|
| 604 |
|
| 605 | #define NOTES \
|
| 606 | .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
|
| 607 | VMLINUX_SYMBOL(__start_notes) = .; \
|
| 608 | *(.note.*) \
|
| 609 | VMLINUX_SYMBOL(__stop_notes) = .; \
|
| 610 | }
|
| 611 |
|
| 612 | #define INIT_SETUP(initsetup_align) \
|
| 613 | . = ALIGN(initsetup_align); \
|
| 614 | VMLINUX_SYMBOL(__setup_start) = .; \
|
| 615 | *(.init.setup) \
|
| 616 | VMLINUX_SYMBOL(__setup_end) = .;
|
| 617 |
|
| 618 | #define INITCALLS \
|
| 619 | *(.initcallearly.init) \
|
| 620 | VMLINUX_SYMBOL(__early_initcall_end) = .; \
|
| 621 | *(.initcall0.init) \
|
| 622 | *(.initcall0s.init) \
|
| 623 | *(.initcall1.init) \
|
| 624 | *(.initcall1s.init) \
|
| 625 | *(.initcall2.init) \
|
| 626 | *(.initcall2s.init) \
|
| 627 | *(.initcall3.init) \
|
| 628 | *(.initcall3s.init) \
|
| 629 | *(.initcall4.init) \
|
| 630 | *(.initcall4s.init) \
|
| 631 | *(.initcall5.init) \
|
| 632 | *(.initcall5s.init) \
|
| 633 | *(.initcallrootfs.init) \
|
| 634 | *(.initcall6.init) \
|
| 635 | *(.initcall6s.init) \
|
| 636 | *(.initcall7.init) \
|
| 637 | *(.initcall7s.init)
|
| 638 |
|
| 639 | #define INIT_CALLS \
|
| 640 | VMLINUX_SYMBOL(__initcall_start) = .; \
|
| 641 | INITCALLS \
|
| 642 | VMLINUX_SYMBOL(__initcall_end) = .;
|
| 643 |
|
| 644 | #define CON_INITCALL \
|
| 645 | VMLINUX_SYMBOL(__con_initcall_start) = .; \
|
| 646 | *(.con_initcall.init) \
|
| 647 | VMLINUX_SYMBOL(__con_initcall_end) = .;
|
| 648 |
|
| 649 | #define SECURITY_INITCALL \
|
| 650 | VMLINUX_SYMBOL(__security_initcall_start) = .; \
|
| 651 | *(.security_initcall.init) \
|
| 652 | VMLINUX_SYMBOL(__security_initcall_end) = .;
|
| 653 |
|
| 654 | #ifdef CONFIG_BLK_DEV_INITRD
|
| 655 | #define INIT_RAM_FS \
|
| 656 | . = ALIGN(4); \
|
| 657 | VMLINUX_SYMBOL(__initramfs_start) = .; \
|
| 658 | *(.init.ramfs) \
|
| 659 | . = ALIGN(8); \
|
| 660 | *(.init.ramfs.info)
|
| 661 | #else
|
| 662 | #define INIT_RAM_FS
|
| 663 | #endif
|
| 664 |
|
| 665 | |
| 666 | * Default discarded sections.
|
| 667 | *
|
| 668 | * Some archs want to discard exit text/data at runtime rather than
|
| 669 | * link time due to cross-section references such as alt instructions,
|
| 670 | * bug table, eh_frame, etc. DISCARDS must be the last of output
|
| 671 | * section definitions so that such archs put those in earlier section
|
| 672 | * definitions.
|
| 673 |
|
| 674 | #define DISCARDS \
|
| 675 | /DISCARD/ : { \
|
| 676 | EXIT_TEXT \
|
| 677 | EXIT_DATA \
|
| 678 | EXIT_CALL \
|
| 679 | *(.discard) \
|
| 680 | *(.discard.*) \
|
| 681 | }
|
| 682 |
|
| 683 | |
| 684 | * PERCPU_INPUT - the percpu input sections
|
| 685 | * @cacheline: cacheline size
|
| 686 | *
|
| 687 | * The core percpu section names and core symbols which do not rely
|
| 688 | * directly upon load addresses.
|
| 689 | *
|
| 690 | * @cacheline is used to align subsections to avoid false cacheline
|
| 691 | * sharing between subsections for different purposes.
|
| 692 |
|
| 693 | #define PERCPU_INPUT(cacheline) \
|
| 694 | VMLINUX_SYMBOL(__per_cpu_start) = .; \
|
| 695 | *(.data..percpu..first) \
|
| 696 | . = ALIGN(PAGE_SIZE); \
|
| 697 | *(.data..percpu..page_aligned) \
|
| 698 | . = ALIGN(cacheline); \
|
| 699 | *(.data..percpu..readmostly) \
|
| 700 | . = ALIGN(cacheline); \
|
| 701 | *(.data..percpu) \
|
| 702 | *(.data..percpu..shared_aligned) \
|
| 703 | VMLINUX_SYMBOL(__per_cpu_end) = .;
|
| 704 |
|
| 705 | |
| 706 | * PERCPU_VADDR - define output section for percpu area
|
| 707 | * @cacheline: cacheline size
|
| 708 | * @vaddr: explicit base address (optional)
|
| 709 | * @phdr: destination PHDR (optional)
|
| 710 | *
|
| 711 | * Macro which expands to output section for percpu area.
|
| 712 | *
|
| 713 | * @cacheline is used to align subsections to avoid false cacheline
|
| 714 | * sharing between subsections for different purposes.
|
| 715 | *
|
| 716 | * If @vaddr is not blank, it specifies explicit base address and all
|
| 717 | * percpu symbols will be offset from the given address. If blank,
|
| 718 | * @vaddr always equals @laddr + LOAD_OFFSET.
|
| 719 | *
|
| 720 | * @phdr defines the output PHDR to use if not blank. Be warned that
|
| 721 | * output PHDR is sticky. If @phdr is specified, the next output
|
| 722 | * section in the linker script will go there too. @phdr should have
|
| 723 | * a leading colon.
|
| 724 | *
|
| 725 | * Note that this macros defines __per_cpu_load as an absolute symbol.
|
| 726 | * If there is no need to put the percpu section at a predetermined
|
| 727 | * address, use PERCPU_SECTION.
|
| 728 |
|
| 729 | #define PERCPU_VADDR(cacheline, vaddr, phdr) \
|
| 730 | VMLINUX_SYMBOL(__per_cpu_load) = .; \
|
| 731 | .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
|
| 732 | - LOAD_OFFSET) { \
|
| 733 | PERCPU_INPUT(cacheline) \
|
| 734 | } phdr \
|
| 735 | . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
|
| 736 |
|
| 737 | |
| 738 | * PERCPU_SECTION - define output section for percpu area, simple version
|
| 739 | * @cacheline: cacheline size
|
| 740 | *
|
| 741 | * Align to PAGE_SIZE and outputs output section for percpu area. This
|
| 742 | * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
|
| 743 | * __per_cpu_start will be identical.
|
| 744 | *
|
| 745 | * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
|
| 746 | * except that __per_cpu_load is defined as a relative symbol against
|
| 747 | * .data..percpu which is required for relocatable x86_32 configuration.
|
| 748 |
|
| 749 | #define PERCPU_SECTION(cacheline) \
|
| 750 | . = ALIGN(PAGE_SIZE); \
|
| 751 | .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
|
| 752 | VMLINUX_SYMBOL(__per_cpu_load) = .; \
|
| 753 | PERCPU_INPUT(cacheline) \
|
| 754 | }
|
| 755 |
|
| 756 |
|
| 757 | |
| 758 | * Definition of the high level *_SECTION macros
|
| 759 | * They will fit only a subset of the architectures
|
| 760 |
|
| 761 |
|
| 762 |
|
| 763 | |
| 764 | * Writeable data.
|
| 765 | * All sections are combined in a single .data section.
|
| 766 | * The sections following CONSTRUCTORS are arranged so their
|
| 767 | * typical alignment matches.
|
| 768 | * A cacheline is typical/always less than a PAGE_SIZE so
|
| 769 | * the sections that has this restriction (or similar)
|
| 770 | * is located before the ones requiring PAGE_SIZE alignment.
|
| 771 | * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
|
| 772 | * matches the requirement of PAGE_ALIGNED_DATA.
|
| 773 | *
|
| 774 | * use 0 as page_align if page_aligned data is not used
|
| 775 | #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
|
| 776 | . = ALIGN(PAGE_SIZE); \
|
| 777 | .data : AT(ADDR(.data) - LOAD_OFFSET) { \
|
| 778 | INIT_TASK_DATA(inittask) \
|
| 779 | NOSAVE_DATA \
|
| 780 | PAGE_ALIGNED_DATA(pagealigned) \
|
| 781 | CACHELINE_ALIGNED_DATA(cacheline) \
|
| 782 | READ_MOSTLY_DATA(cacheline) \
|
| 783 | DATA_DATA \
|
| 784 | CONSTRUCTORS \
|
| 785 | }
|
| 786 |
|
| 787 | #define INIT_TEXT_SECTION(inittext_align) \
|
| 788 | . = ALIGN(inittext_align); \
|
| 789 | .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
|
| 790 | VMLINUX_SYMBOL(_sinittext) = .; \
|
| 791 | INIT_TEXT \
|
| 792 | VMLINUX_SYMBOL(_einittext) = .; \
|
| 793 | }
|
| 794 |
|
| 795 | #define INIT_DATA_SECTION(initsetup_align) \
|
| 796 | .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
|
| 797 | INIT_DATA \
|
| 798 | INIT_SETUP(initsetup_align) \
|
| 799 | INIT_CALLS \
|
| 800 | CON_INITCALL \
|
| 801 | SECURITY_INITCALL \
|
| 802 | INIT_RAM_FS \
|
| 803 | }
|
| 804 |
|
| 805 | #define BSS_SECTION(sbss_align, bss_align, stop_align) \
|
| 806 | . = ALIGN(sbss_align); \
|
| 807 | VMLINUX_SYMBOL(__bss_start) = .; \
|
| 808 | SBSS(sbss_align) \
|
| 809 | BSS(bss_align) \
|
| 810 | . = ALIGN(stop_align); \
|
| 811 | VMLINUX_SYMBOL(__bss_stop) = .;
|