| 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(...)
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| 9 | * OUTPUT_ARCH(...)
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| 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(...)
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| 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(PAGE_SIZE)
|
| 27 | * RW_DATA(...)
|
| 28 | * _edata = .;
|
| 29 | *
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| 30 | * EXCEPTION_TABLE(...)
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| 31 | *
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| 32 | * BSS_SECTION(0, 0, 0)
|
| 33 | * _end = .;
|
| 34 | *
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| 35 | * STABS_DEBUG
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| 36 | * DWARF_DEBUG
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| 37 | * ELF_DETAILS
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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 | * // __init_begin and __init_end should be page aligned, so that we can
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| 44 | * // free the whole .init memory
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| 45 | * [_stext, _etext] is the text section
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| 46 | * [_sdata, _edata] is the data section
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| 47 | *
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| 48 | * Some of the included output section have their own set of constants.
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| 49 | * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
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| 50 | * [__nosave_begin, __nosave_end] for the nosave data
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| 51 |
|
| 52 |
|
| 53 | #ifndef LOAD_OFFSET
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| 54 | #define LOAD_OFFSET 0
|
| 55 | #endif
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| 56 |
|
| 57 | |
| 58 | * Only some architectures want to have the .notes segment visible in
|
| 59 | * a separate PT_NOTE ELF Program Header. When this happens, it needs
|
| 60 | * to be visible in both the kernel text's PT_LOAD and the PT_NOTE
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| 61 | * Program Headers. In this case, though, the PT_LOAD needs to be made
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| 62 | * the default again so that all the following sections don't also end
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| 63 | * up in the PT_NOTE Program Header.
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| 64 |
|
| 65 | #ifdef EMITS_PT_NOTE
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| 66 | #define NOTES_HEADERS :text :note
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| 67 | #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text
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| 68 | #else
|
| 69 | #define NOTES_HEADERS
|
| 70 | #define NOTES_HEADERS_RESTORE
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| 71 | #endif
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| 72 |
|
| 73 | |
| 74 | * Some architectures have non-executable read-only exception tables.
|
| 75 | * They can be added to the RO_DATA segment by specifying their desired
|
| 76 | * alignment.
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| 77 |
|
| 78 | #ifdef RO_EXCEPTION_TABLE_ALIGN
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| 79 | #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
|
| 80 | #else
|
| 81 | #define RO_EXCEPTION_TABLE
|
| 82 | #endif
|
| 83 |
|
| 84 |
|
| 85 | #define ALIGN_FUNCTION() . = ALIGN(8)
|
| 86 |
|
| 87 | |
| 88 | * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
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| 89 | * generates .data.identifier sections, which need to be pulled in with
|
| 90 | * .data. We don't want to pull in .data..other sections, which Linux
|
| 91 | * has defined. Same for text and bss.
|
| 92 | *
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| 93 | * With LTO_CLANG, the linker also splits sections by default, so we need
|
| 94 | * these macros to combine the sections during the final link.
|
| 95 | *
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| 96 | * RODATA_MAIN is not used because existing code already defines .rodata.x
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| 97 | * sections to be brought in with rodata.
|
| 98 |
|
| 99 | #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG)
|
| 100 | #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
|
| 101 | #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L*
|
| 102 | #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
|
| 103 | #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
|
| 104 | #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral*
|
| 105 | #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
|
| 106 | #else
|
| 107 | #define TEXT_MAIN .text
|
| 108 | #define DATA_MAIN .data
|
| 109 | #define SDATA_MAIN .sdata
|
| 110 | #define RODATA_MAIN .rodata
|
| 111 | #define BSS_MAIN .bss
|
| 112 | #define SBSS_MAIN .sbss
|
| 113 | #endif
|
| 114 |
|
| 115 | |
| 116 | * GCC 4.5 and later have a 32 bytes section alignment for structures.
|
| 117 | * Except GCC 4.9, that feels the need to align on 64 bytes.
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| 118 |
|
| 119 | #define STRUCT_ALIGNMENT 32
|
| 120 | #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
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| 121 |
|
| 122 | |
| 123 | * The order of the sched class addresses are important, as they are
|
| 124 | * used to determine the order of the priority of each sched class in
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| 125 | * relation to each other.
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| 126 |
|
| 127 | #define SCHED_DATA \
|
| 128 | STRUCT_ALIGN(); \
|
| 129 | __begin_sched_classes = .; \
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| 130 | *(__idle_sched_class) \
|
| 131 | *(__fair_sched_class) \
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| 132 | *(__rt_sched_class) \
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| 133 | *(__dl_sched_class) \
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| 134 | *(__stop_sched_class) \
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| 135 | __end_sched_classes = .;
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| 136 |
|
| 137 | |
| 138 | * are handled as text/data or they can be discarded (which
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| 139 | * often happens at runtime)
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| 140 |
|
| 141 | #ifdef CONFIG_HOTPLUG_CPU
|
| 142 | #define CPU_KEEP(sec) *(.cpu##sec)
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| 143 | #define CPU_DISCARD(sec)
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| 144 | #else
|
| 145 | #define CPU_KEEP(sec)
|
| 146 | #define CPU_DISCARD(sec) *(.cpu##sec)
|
| 147 | #endif
|
| 148 |
|
| 149 | #if defined(CONFIG_MEMORY_HOTPLUG)
|
| 150 | #define MEM_KEEP(sec) *(.mem##sec)
|
| 151 | #define MEM_DISCARD(sec)
|
| 152 | #else
|
| 153 | #define MEM_KEEP(sec)
|
| 154 | #define MEM_DISCARD(sec) *(.mem##sec)
|
| 155 | #endif
|
| 156 |
|
| 157 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD
|
| 158 | |
| 159 | * The ftrace call sites are logged to a section whose name depends on the
|
| 160 | * compiler option used. A given kernel image will only use one, AKA
|
| 161 | * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
|
| 162 | * dependencies for FTRACE_CALLSITE_SECTION's definition.
|
| 163 | *
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| 164 | * Need to also make ftrace_stub_graph point to ftrace_stub
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| 165 | * so that the same stub location may have different protocols
|
| 166 | * and not mess up with C verifiers.
|
| 167 |
|
| 168 | #define MCOUNT_REC() . = ALIGN(8); \
|
| 169 | __start_mcount_loc = .; \
|
| 170 | KEEP(*(__mcount_loc)) \
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| 171 | KEEP(*(__patchable_function_entries)) \
|
| 172 | __stop_mcount_loc = .; \
|
| 173 | ftrace_stub_graph = ftrace_stub;
|
| 174 | #else
|
| 175 | # ifdef CONFIG_FUNCTION_TRACER
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| 176 | # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub;
|
| 177 | # else
|
| 178 | # define MCOUNT_REC()
|
| 179 | # endif
|
| 180 | #endif
|
| 181 |
|
| 182 | #ifdef CONFIG_TRACE_BRANCH_PROFILING
|
| 183 | #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
|
| 184 | KEEP(*(_ftrace_annotated_branch)) \
|
| 185 | __stop_annotated_branch_profile = .;
|
| 186 | #else
|
| 187 | #define LIKELY_PROFILE()
|
| 188 | #endif
|
| 189 |
|
| 190 | #ifdef CONFIG_PROFILE_ALL_BRANCHES
|
| 191 | #define BRANCH_PROFILE() __start_branch_profile = .; \
|
| 192 | KEEP(*(_ftrace_branch)) \
|
| 193 | __stop_branch_profile = .;
|
| 194 | #else
|
| 195 | #define BRANCH_PROFILE()
|
| 196 | #endif
|
| 197 |
|
| 198 | #ifdef CONFIG_KPROBES
|
| 199 | #define KPROBE_BLACKLIST() . = ALIGN(8); \
|
| 200 | __start_kprobe_blacklist = .; \
|
| 201 | KEEP(*(_kprobe_blacklist)) \
|
| 202 | __stop_kprobe_blacklist = .;
|
| 203 | #else
|
| 204 | #define KPROBE_BLACKLIST()
|
| 205 | #endif
|
| 206 |
|
| 207 | #ifdef CONFIG_FUNCTION_ERROR_INJECTION
|
| 208 | #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
|
| 209 | __start_error_injection_whitelist = .; \
|
| 210 | KEEP(*(_error_injection_whitelist)) \
|
| 211 | __stop_error_injection_whitelist = .;
|
| 212 | #else
|
| 213 | #define ERROR_INJECT_WHITELIST()
|
| 214 | #endif
|
| 215 |
|
| 216 | #ifdef CONFIG_EVENT_TRACING
|
| 217 | #define FTRACE_EVENTS() . = ALIGN(8); \
|
| 218 | __start_ftrace_events = .; \
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| 219 | KEEP(*(_ftrace_events)) \
|
| 220 | __stop_ftrace_events = .; \
|
| 221 | __start_ftrace_eval_maps = .; \
|
| 222 | KEEP(*(_ftrace_eval_map)) \
|
| 223 | __stop_ftrace_eval_maps = .;
|
| 224 | #else
|
| 225 | #define FTRACE_EVENTS()
|
| 226 | #endif
|
| 227 |
|
| 228 | #ifdef CONFIG_TRACING
|
| 229 | #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
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| 230 | KEEP(*(__trace_printk_fmt)) \
|
| 231 | __stop___trace_bprintk_fmt = .;
|
| 232 | #define TRACEPOINT_STR() __start___tracepoint_str = .; \
|
| 233 | KEEP(*(__tracepoint_str)) \
|
| 234 | __stop___tracepoint_str = .;
|
| 235 | #else
|
| 236 | #define TRACE_PRINTKS()
|
| 237 | #define TRACEPOINT_STR()
|
| 238 | #endif
|
| 239 |
|
| 240 | #ifdef CONFIG_FTRACE_SYSCALLS
|
| 241 | #define TRACE_SYSCALLS() . = ALIGN(8); \
|
| 242 | __start_syscalls_metadata = .; \
|
| 243 | KEEP(*(__syscalls_metadata)) \
|
| 244 | __stop_syscalls_metadata = .;
|
| 245 | #else
|
| 246 | #define TRACE_SYSCALLS()
|
| 247 | #endif
|
| 248 |
|
| 249 | #ifdef CONFIG_BPF_EVENTS
|
| 250 | #define BPF_RAW_TP() STRUCT_ALIGN(); \
|
| 251 | __start__bpf_raw_tp = .; \
|
| 252 | KEEP(*(__bpf_raw_tp_map)) \
|
| 253 | __stop__bpf_raw_tp = .;
|
| 254 | #else
|
| 255 | #define BPF_RAW_TP()
|
| 256 | #endif
|
| 257 |
|
| 258 | #ifdef CONFIG_SERIAL_EARLYCON
|
| 259 | #define EARLYCON_TABLE() . = ALIGN(8); \
|
| 260 | __earlycon_table = .; \
|
| 261 | KEEP(*(__earlycon_table)) \
|
| 262 | __earlycon_table_end = .;
|
| 263 | #else
|
| 264 | #define EARLYCON_TABLE()
|
| 265 | #endif
|
| 266 |
|
| 267 | #ifdef CONFIG_SECURITY
|
| 268 | #define LSM_TABLE() . = ALIGN(8); \
|
| 269 | __start_lsm_info = .; \
|
| 270 | KEEP(*(.lsm_info.init)) \
|
| 271 | __end_lsm_info = .;
|
| 272 | #define EARLY_LSM_TABLE() . = ALIGN(8); \
|
| 273 | __start_early_lsm_info = .; \
|
| 274 | KEEP(*(.early_lsm_info.init)) \
|
| 275 | __end_early_lsm_info = .;
|
| 276 | #else
|
| 277 | #define LSM_TABLE()
|
| 278 | #define EARLY_LSM_TABLE()
|
| 279 | #endif
|
| 280 |
|
| 281 | #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
|
| 282 | #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
|
| 283 | #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
|
| 284 | #define _OF_TABLE_0(name)
|
| 285 | #define _OF_TABLE_1(name) \
|
| 286 | . = ALIGN(8); \
|
| 287 | __##name##_of_table = .; \
|
| 288 | KEEP(*(__##name##_of_table)) \
|
| 289 | KEEP(*(__##name##_of_table_end))
|
| 290 |
|
| 291 | #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
|
| 292 | #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
|
| 293 | #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
|
| 294 | #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
|
| 295 | #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
|
| 296 | #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
|
| 297 |
|
| 298 | #ifdef CONFIG_ACPI
|
| 299 | #define ACPI_PROBE_TABLE(name) \
|
| 300 | . = ALIGN(8); \
|
| 301 | __##name##_acpi_probe_table = .; \
|
| 302 | KEEP(*(__##name##_acpi_probe_table)) \
|
| 303 | __##name##_acpi_probe_table_end = .;
|
| 304 | #else
|
| 305 | #define ACPI_PROBE_TABLE(name)
|
| 306 | #endif
|
| 307 |
|
| 308 | #ifdef CONFIG_THERMAL
|
| 309 | #define THERMAL_TABLE(name) \
|
| 310 | . = ALIGN(8); \
|
| 311 | __##name##_thermal_table = .; \
|
| 312 | KEEP(*(__##name##_thermal_table)) \
|
| 313 | __##name##_thermal_table_end = .;
|
| 314 | #else
|
| 315 | #define THERMAL_TABLE(name)
|
| 316 | #endif
|
| 317 |
|
| 318 | #ifdef CONFIG_DTPM
|
| 319 | #define DTPM_TABLE() \
|
| 320 | . = ALIGN(8); \
|
| 321 | __dtpm_table = .; \
|
| 322 | KEEP(*(__dtpm_table)) \
|
| 323 | __dtpm_table_end = .;
|
| 324 | #else
|
| 325 | #define DTPM_TABLE()
|
| 326 | #endif
|
| 327 |
|
| 328 | #define KERNEL_DTB() \
|
| 329 | STRUCT_ALIGN(); \
|
| 330 | __dtb_start = .; \
|
| 331 | KEEP(*(.dtb.init.rodata)) \
|
| 332 | __dtb_end = .;
|
| 333 |
|
| 334 | |
| 335 | * .data section
|
| 336 |
|
| 337 | #define DATA_DATA \
|
| 338 | *(.xiptext) \
|
| 339 | *(DATA_MAIN) \
|
| 340 | *(.ref.data) \
|
| 341 | *(.data..shared_aligned) \
|
| 342 | MEM_KEEP(init.data*) \
|
| 343 | MEM_KEEP(exit.data*) \
|
| 344 | *(.data.unlikely) \
|
| 345 | __start_once = .; \
|
| 346 | *(.data.once) \
|
| 347 | __end_once = .; \
|
| 348 | STRUCT_ALIGN(); \
|
| 349 | *(__tracepoints) \
|
| 350 | \
|
| 351 | . = ALIGN(8); \
|
| 352 | __start___dyndbg = .; \
|
| 353 | KEEP(*(__dyndbg)) \
|
| 354 | __stop___dyndbg = .; \
|
| 355 | LIKELY_PROFILE() \
|
| 356 | BRANCH_PROFILE() \
|
| 357 | TRACE_PRINTKS() \
|
| 358 | BPF_RAW_TP() \
|
| 359 | TRACEPOINT_STR()
|
| 360 |
|
| 361 | |
| 362 | * Data section helpers
|
| 363 |
|
| 364 | #define NOSAVE_DATA \
|
| 365 | . = ALIGN(PAGE_SIZE); \
|
| 366 | __nosave_begin = .; \
|
| 367 | *(.data..nosave) \
|
| 368 | . = ALIGN(PAGE_SIZE); \
|
| 369 | __nosave_end = .;
|
| 370 |
|
| 371 | #define PAGE_ALIGNED_DATA(page_align) \
|
| 372 | . = ALIGN(page_align); \
|
| 373 | *(.data..page_aligned) \
|
| 374 | . = ALIGN(page_align);
|
| 375 |
|
| 376 | #define READ_MOSTLY_DATA(align) \
|
| 377 | . = ALIGN(align); \
|
| 378 | *(.data..read_mostly) \
|
| 379 | . = ALIGN(align);
|
| 380 |
|
| 381 | #define CACHELINE_ALIGNED_DATA(align) \
|
| 382 | . = ALIGN(align); \
|
| 383 | *(.data..cacheline_aligned)
|
| 384 |
|
| 385 | #define INIT_TASK_DATA(align) \
|
| 386 | . = ALIGN(align); \
|
| 387 | __start_init_task = .; \
|
| 388 | init_thread_union = .; \
|
| 389 | init_stack = .; \
|
| 390 | KEEP(*(.data..init_task)) \
|
| 391 | KEEP(*(.data..init_thread_info)) \
|
| 392 | . = __start_init_task + THREAD_SIZE; \
|
| 393 | __end_init_task = .;
|
| 394 |
|
| 395 | #define JUMP_TABLE_DATA \
|
| 396 | . = ALIGN(8); \
|
| 397 | __start___jump_table = .; \
|
| 398 | KEEP(*(__jump_table)) \
|
| 399 | __stop___jump_table = .;
|
| 400 |
|
| 401 | #define STATIC_CALL_DATA \
|
| 402 | . = ALIGN(8); \
|
| 403 | __start_static_call_sites = .; \
|
| 404 | KEEP(*(.static_call_sites)) \
|
| 405 | __stop_static_call_sites = .; \
|
| 406 | __start_static_call_tramp_key = .; \
|
| 407 | KEEP(*(.static_call_tramp_key)) \
|
| 408 | __stop_static_call_tramp_key = .;
|
| 409 |
|
| 410 | |
| 411 | * Allow architectures to handle ro_after_init data on their
|
| 412 | * own by defining an empty RO_AFTER_INIT_DATA.
|
| 413 |
|
| 414 | #ifndef RO_AFTER_INIT_DATA
|
| 415 | #define RO_AFTER_INIT_DATA \
|
| 416 | . = ALIGN(8); \
|
| 417 | __start_ro_after_init = .; \
|
| 418 | *(.data..ro_after_init) \
|
| 419 | JUMP_TABLE_DATA \
|
| 420 | STATIC_CALL_DATA \
|
| 421 | __end_ro_after_init = .;
|
| 422 | #endif
|
| 423 |
|
| 424 | |
| 425 | * Read only Data
|
| 426 |
|
| 427 | #define RO_DATA(align) \
|
| 428 | . = ALIGN((align)); \
|
| 429 | .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
|
| 430 | __start_rodata = .; \
|
| 431 | *(.rodata) *(.rodata.*) \
|
| 432 | SCHED_DATA \
|
| 433 | RO_AFTER_INIT_DATA \
|
| 434 | . = ALIGN(8); \
|
| 435 | __start___tracepoints_ptrs = .; \
|
| 436 | KEEP(*(__tracepoints_ptrs)) \
|
| 437 | __stop___tracepoints_ptrs = .; \
|
| 438 | *(__tracepoints_strings) \
|
| 439 | } \
|
| 440 | \
|
| 441 | .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
|
| 442 | *(.rodata1) \
|
| 443 | } \
|
| 444 | \
|
| 445 | \
|
| 446 | .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
|
| 447 | __start_pci_fixups_early = .; \
|
| 448 | KEEP(*(.pci_fixup_early)) \
|
| 449 | __end_pci_fixups_early = .; \
|
| 450 | __start_pci_fixups_header = .; \
|
| 451 | KEEP(*(.pci_fixup_header)) \
|
| 452 | __end_pci_fixups_header = .; \
|
| 453 | __start_pci_fixups_final = .; \
|
| 454 | KEEP(*(.pci_fixup_final)) \
|
| 455 | __end_pci_fixups_final = .; \
|
| 456 | __start_pci_fixups_enable = .; \
|
| 457 | KEEP(*(.pci_fixup_enable)) \
|
| 458 | __end_pci_fixups_enable = .; \
|
| 459 | __start_pci_fixups_resume = .; \
|
| 460 | KEEP(*(.pci_fixup_resume)) \
|
| 461 | __end_pci_fixups_resume = .; \
|
| 462 | __start_pci_fixups_resume_early = .; \
|
| 463 | KEEP(*(.pci_fixup_resume_early)) \
|
| 464 | __end_pci_fixups_resume_early = .; \
|
| 465 | __start_pci_fixups_suspend = .; \
|
| 466 | KEEP(*(.pci_fixup_suspend)) \
|
| 467 | __end_pci_fixups_suspend = .; \
|
| 468 | __start_pci_fixups_suspend_late = .; \
|
| 469 | KEEP(*(.pci_fixup_suspend_late)) \
|
| 470 | __end_pci_fixups_suspend_late = .; \
|
| 471 | } \
|
| 472 | \
|
| 473 | \
|
| 474 | .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \
|
| 475 | __start_builtin_fw = .; \
|
| 476 | KEEP(*(.builtin_fw)) \
|
| 477 | __end_builtin_fw = .; \
|
| 478 | } \
|
| 479 | \
|
| 480 | TRACEDATA \
|
| 481 | \
|
| 482 | PRINTK_INDEX \
|
| 483 | \
|
| 484 | \
|
| 485 | __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
|
| 486 | __start___ksymtab = .; \
|
| 487 | KEEP(*(SORT(___ksymtab+*))) \
|
| 488 | __stop___ksymtab = .; \
|
| 489 | } \
|
| 490 | \
|
| 491 | \
|
| 492 | __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
|
| 493 | __start___ksymtab_gpl = .; \
|
| 494 | KEEP(*(SORT(___ksymtab_gpl+*))) \
|
| 495 | __stop___ksymtab_gpl = .; \
|
| 496 | } \
|
| 497 | \
|
| 498 | \
|
| 499 | __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
|
| 500 | __start___kcrctab = .; \
|
| 501 | KEEP(*(SORT(___kcrctab+*))) \
|
| 502 | __stop___kcrctab = .; \
|
| 503 | } \
|
| 504 | \
|
| 505 | \
|
| 506 | __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
|
| 507 | __start___kcrctab_gpl = .; \
|
| 508 | KEEP(*(SORT(___kcrctab_gpl+*))) \
|
| 509 | __stop___kcrctab_gpl = .; \
|
| 510 | } \
|
| 511 | \
|
| 512 | \
|
| 513 | __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
|
| 514 | *(__ksymtab_strings) \
|
| 515 | } \
|
| 516 | \
|
| 517 | \
|
| 518 | __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
|
| 519 | *(.ref.rodata) \
|
| 520 | MEM_KEEP(init.rodata) \
|
| 521 | MEM_KEEP(exit.rodata) \
|
| 522 | } \
|
| 523 | \
|
| 524 | \
|
| 525 | __param : AT(ADDR(__param) - LOAD_OFFSET) { \
|
| 526 | __start___param = .; \
|
| 527 | KEEP(*(__param)) \
|
| 528 | __stop___param = .; \
|
| 529 | } \
|
| 530 | \
|
| 531 | \
|
| 532 | __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
|
| 533 | __start___modver = .; \
|
| 534 | KEEP(*(__modver)) \
|
| 535 | __stop___modver = .; \
|
| 536 | } \
|
| 537 | \
|
| 538 | RO_EXCEPTION_TABLE \
|
| 539 | NOTES \
|
| 540 | BTF \
|
| 541 | \
|
| 542 | . = ALIGN((align)); \
|
| 543 | __end_rodata = .;
|
| 544 |
|
| 545 |
|
| 546 | |
| 547 | * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI)
|
| 548 | * jump table entries.
|
| 549 |
|
| 550 | #ifdef CONFIG_CFI_CLANG
|
| 551 | #define TEXT_CFI_JT \
|
| 552 | . = ALIGN(PMD_SIZE); \
|
| 553 | __cfi_jt_start = .; \
|
| 554 | *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \
|
| 555 | . = ALIGN(PMD_SIZE); \
|
| 556 | __cfi_jt_end = .;
|
| 557 | #else
|
| 558 | #define TEXT_CFI_JT
|
| 559 | #endif
|
| 560 |
|
| 561 | |
| 562 | * Non-instrumentable text section
|
| 563 |
|
| 564 | #define NOINSTR_TEXT \
|
| 565 | ALIGN_FUNCTION(); \
|
| 566 | __noinstr_text_start = .; \
|
| 567 | *(.noinstr.text) \
|
| 568 | __noinstr_text_end = .;
|
| 569 |
|
| 570 | |
| 571 | * .text section. Map to function alignment to avoid address changes
|
| 572 | * during second ld run in second ld pass when generating System.map
|
| 573 | *
|
| 574 | * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
|
| 575 | * code elimination is enabled, so these sections should be converted
|
| 576 | * to use ".." first.
|
| 577 |
|
| 578 | #define TEXT_TEXT \
|
| 579 | ALIGN_FUNCTION(); \
|
| 580 | *(.text.hot .text.hot.*) \
|
| 581 | *(TEXT_MAIN .text.fixup) \
|
| 582 | *(.text.unlikely .text.unlikely.*) \
|
| 583 | *(.text.unknown .text.unknown.*) \
|
| 584 | NOINSTR_TEXT \
|
| 585 | *(.text..refcount) \
|
| 586 | *(.ref.text) \
|
| 587 | *(.text.asan.* .text.tsan.*) \
|
| 588 | TEXT_CFI_JT \
|
| 589 | MEM_KEEP(init.text*) \
|
| 590 | MEM_KEEP(exit.text*) \
|
| 591 |
|
| 592 |
|
| 593 | |
| 594 | * address even at second ld pass when generating System.map
|
| 595 | #define SCHED_TEXT \
|
| 596 | ALIGN_FUNCTION(); \
|
| 597 | __sched_text_start = .; \
|
| 598 | *(.sched.text) \
|
| 599 | __sched_text_end = .;
|
| 600 |
|
| 601 | |
| 602 | * address even at second ld pass when generating System.map
|
| 603 | #define LOCK_TEXT \
|
| 604 | ALIGN_FUNCTION(); \
|
| 605 | __lock_text_start = .; \
|
| 606 | *(.spinlock.text) \
|
| 607 | __lock_text_end = .;
|
| 608 |
|
| 609 | #define CPUIDLE_TEXT \
|
| 610 | ALIGN_FUNCTION(); \
|
| 611 | __cpuidle_text_start = .; \
|
| 612 | *(.cpuidle.text) \
|
| 613 | __cpuidle_text_end = .;
|
| 614 |
|
| 615 | #define KPROBES_TEXT \
|
| 616 | ALIGN_FUNCTION(); \
|
| 617 | __kprobes_text_start = .; \
|
| 618 | *(.kprobes.text) \
|
| 619 | __kprobes_text_end = .;
|
| 620 |
|
| 621 | #define ENTRY_TEXT \
|
| 622 | ALIGN_FUNCTION(); \
|
| 623 | __entry_text_start = .; \
|
| 624 | *(.entry.text) \
|
| 625 | __entry_text_end = .;
|
| 626 |
|
| 627 | #define IRQENTRY_TEXT \
|
| 628 | ALIGN_FUNCTION(); \
|
| 629 | __irqentry_text_start = .; \
|
| 630 | *(.irqentry.text) \
|
| 631 | __irqentry_text_end = .;
|
| 632 |
|
| 633 | #define SOFTIRQENTRY_TEXT \
|
| 634 | ALIGN_FUNCTION(); \
|
| 635 | __softirqentry_text_start = .; \
|
| 636 | *(.softirqentry.text) \
|
| 637 | __softirqentry_text_end = .;
|
| 638 |
|
| 639 | #define STATIC_CALL_TEXT \
|
| 640 | ALIGN_FUNCTION(); \
|
| 641 | __static_call_text_start = .; \
|
| 642 | *(.static_call.text) \
|
| 643 | __static_call_text_end = .;
|
| 644 |
|
| 645 |
|
| 646 | #define HEAD_TEXT KEEP(*(.head.text))
|
| 647 |
|
| 648 | #define HEAD_TEXT_SECTION \
|
| 649 | .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
|
| 650 | HEAD_TEXT \
|
| 651 | }
|
| 652 |
|
| 653 | |
| 654 | * Exception table
|
| 655 |
|
| 656 | #define EXCEPTION_TABLE(align) \
|
| 657 | . = ALIGN(align); \
|
| 658 | __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
|
| 659 | __start___ex_table = .; \
|
| 660 | KEEP(*(__ex_table)) \
|
| 661 | __stop___ex_table = .; \
|
| 662 | }
|
| 663 |
|
| 664 | |
| 665 | * .BTF
|
| 666 |
|
| 667 | #ifdef CONFIG_DEBUG_INFO_BTF
|
| 668 | #define BTF \
|
| 669 | .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
|
| 670 | __start_BTF = .; \
|
| 671 | KEEP(*(.BTF)) \
|
| 672 | __stop_BTF = .; \
|
| 673 | } \
|
| 674 | . = ALIGN(4); \
|
| 675 | .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \
|
| 676 | *(.BTF_ids) \
|
| 677 | }
|
| 678 | #else
|
| 679 | #define BTF
|
| 680 | #endif
|
| 681 |
|
| 682 | |
| 683 | * Init task
|
| 684 |
|
| 685 | #define INIT_TASK_DATA_SECTION(align) \
|
| 686 | . = ALIGN(align); \
|
| 687 | .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
|
| 688 | INIT_TASK_DATA(align) \
|
| 689 | }
|
| 690 |
|
| 691 | #ifdef CONFIG_CONSTRUCTORS
|
| 692 | #define KERNEL_CTORS() . = ALIGN(8); \
|
| 693 | __ctors_start = .; \
|
| 694 | KEEP(*(SORT(.ctors.*))) \
|
| 695 | KEEP(*(.ctors)) \
|
| 696 | KEEP(*(SORT(.init_array.*))) \
|
| 697 | KEEP(*(.init_array)) \
|
| 698 | __ctors_end = .;
|
| 699 | #else
|
| 700 | #define KERNEL_CTORS()
|
| 701 | #endif
|
| 702 |
|
| 703 |
|
| 704 | #define INIT_DATA \
|
| 705 | KEEP(*(SORT(___kentry+*))) \
|
| 706 | *(.init.data init.data.*) \
|
| 707 | MEM_DISCARD(init.data*) \
|
| 708 | KERNEL_CTORS() \
|
| 709 | MCOUNT_REC() \
|
| 710 | *(.init.rodata .init.rodata.*) \
|
| 711 | FTRACE_EVENTS() \
|
| 712 | TRACE_SYSCALLS() \
|
| 713 | KPROBE_BLACKLIST() \
|
| 714 | ERROR_INJECT_WHITELIST() \
|
| 715 | MEM_DISCARD(init.rodata) \
|
| 716 | CLK_OF_TABLES() \
|
| 717 | RESERVEDMEM_OF_TABLES() \
|
| 718 | TIMER_OF_TABLES() \
|
| 719 | CPU_METHOD_OF_TABLES() \
|
| 720 | CPUIDLE_METHOD_OF_TABLES() \
|
| 721 | KERNEL_DTB() \
|
| 722 | IRQCHIP_OF_MATCH_TABLE() \
|
| 723 | ACPI_PROBE_TABLE(irqchip) \
|
| 724 | ACPI_PROBE_TABLE(timer) \
|
| 725 | THERMAL_TABLE(governor) \
|
| 726 | DTPM_TABLE() \
|
| 727 | EARLYCON_TABLE() \
|
| 728 | LSM_TABLE() \
|
| 729 | EARLY_LSM_TABLE() \
|
| 730 | KUNIT_TABLE()
|
| 731 |
|
| 732 | #define INIT_TEXT \
|
| 733 | *(.init.text .init.text.*) \
|
| 734 | *(.text.startup) \
|
| 735 | MEM_DISCARD(init.text*)
|
| 736 |
|
| 737 | #define EXIT_DATA \
|
| 738 | *(.exit.data .exit.data.*) \
|
| 739 | *(.fini_array .fini_array.*) \
|
| 740 | *(.dtors .dtors.*) \
|
| 741 | MEM_DISCARD(exit.data*) \
|
| 742 | MEM_DISCARD(exit.rodata*)
|
| 743 |
|
| 744 | #define EXIT_TEXT \
|
| 745 | *(.exit.text) \
|
| 746 | *(.text.exit) \
|
| 747 | MEM_DISCARD(exit.text)
|
| 748 |
|
| 749 | #define EXIT_CALL \
|
| 750 | *(.exitcall.exit)
|
| 751 |
|
| 752 | |
| 753 | * bss (Block Started by Symbol) - uninitialized data
|
| 754 | * zeroed during startup
|
| 755 |
|
| 756 | #define SBSS(sbss_align) \
|
| 757 | . = ALIGN(sbss_align); \
|
| 758 | .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
|
| 759 | *(.dynsbss) \
|
| 760 | *(SBSS_MAIN) \
|
| 761 | *(.scommon) \
|
| 762 | }
|
| 763 |
|
| 764 | |
| 765 | * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
|
| 766 | * sections to the front of bss.
|
| 767 |
|
| 768 | #ifndef BSS_FIRST_SECTIONS
|
| 769 | #define BSS_FIRST_SECTIONS
|
| 770 | #endif
|
| 771 |
|
| 772 | #define BSS(bss_align) \
|
| 773 | . = ALIGN(bss_align); \
|
| 774 | .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
|
| 775 | BSS_FIRST_SECTIONS \
|
| 776 | . = ALIGN(PAGE_SIZE); \
|
| 777 | *(.bss..page_aligned) \
|
| 778 | . = ALIGN(PAGE_SIZE); \
|
| 779 | *(.dynbss) \
|
| 780 | *(BSS_MAIN) \
|
| 781 | *(COMMON) \
|
| 782 | }
|
| 783 |
|
| 784 | |
| 785 | * DWARF debug sections.
|
| 786 | * Symbols in the DWARF debugging sections are relative to
|
| 787 | * the beginning of the section so we begin them at 0.
|
| 788 |
|
| 789 | #define DWARF_DEBUG \
|
| 790 | \
|
| 791 | .debug 0 : { *(.debug) } \
|
| 792 | .line 0 : { *(.line) } \
|
| 793 | \
|
| 794 | .debug_srcinfo 0 : { *(.debug_srcinfo) } \
|
| 795 | .debug_sfnames 0 : { *(.debug_sfnames) } \
|
| 796 | \
|
| 797 | .debug_aranges 0 : { *(.debug_aranges) } \
|
| 798 | .debug_pubnames 0 : { *(.debug_pubnames) } \
|
| 799 | \
|
| 800 | .debug_info 0 : { *(.debug_info \
|
| 801 | .gnu.linkonce.wi.*) } \
|
| 802 | .debug_abbrev 0 : { *(.debug_abbrev) } \
|
| 803 | .debug_line 0 : { *(.debug_line) } \
|
| 804 | .debug_frame 0 : { *(.debug_frame) } \
|
| 805 | .debug_str 0 : { *(.debug_str) } \
|
| 806 | .debug_loc 0 : { *(.debug_loc) } \
|
| 807 | .debug_macinfo 0 : { *(.debug_macinfo) } \
|
| 808 | .debug_pubtypes 0 : { *(.debug_pubtypes) } \
|
| 809 | \
|
| 810 | .debug_ranges 0 : { *(.debug_ranges) } \
|
| 811 | \
|
| 812 | .debug_weaknames 0 : { *(.debug_weaknames) } \
|
| 813 | .debug_funcnames 0 : { *(.debug_funcnames) } \
|
| 814 | .debug_typenames 0 : { *(.debug_typenames) } \
|
| 815 | .debug_varnames 0 : { *(.debug_varnames) } \
|
| 816 | \
|
| 817 | .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
|
| 818 | .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
|
| 819 | \
|
| 820 | .debug_types 0 : { *(.debug_types) } \
|
| 821 | \
|
| 822 | .debug_addr 0 : { *(.debug_addr) } \
|
| 823 | .debug_line_str 0 : { *(.debug_line_str) } \
|
| 824 | .debug_loclists 0 : { *(.debug_loclists) } \
|
| 825 | .debug_macro 0 : { *(.debug_macro) } \
|
| 826 | .debug_names 0 : { *(.debug_names) } \
|
| 827 | .debug_rnglists 0 : { *(.debug_rnglists) } \
|
| 828 | .debug_str_offsets 0 : { *(.debug_str_offsets) }
|
| 829 |
|
| 830 |
|
| 831 | #define STABS_DEBUG \
|
| 832 | .stab 0 : { *(.stab) } \
|
| 833 | .stabstr 0 : { *(.stabstr) } \
|
| 834 | .stab.excl 0 : { *(.stab.excl) } \
|
| 835 | .stab.exclstr 0 : { *(.stab.exclstr) } \
|
| 836 | .stab.index 0 : { *(.stab.index) } \
|
| 837 | .stab.indexstr 0 : { *(.stab.indexstr) }
|
| 838 |
|
| 839 |
|
| 840 | #define ELF_DETAILS \
|
| 841 | .comment 0 : { *(.comment) } \
|
| 842 | .symtab 0 : { *(.symtab) } \
|
| 843 | .strtab 0 : { *(.strtab) } \
|
| 844 | .shstrtab 0 : { *(.shstrtab) }
|
| 845 |
|
| 846 | #ifdef CONFIG_GENERIC_BUG
|
| 847 | #define BUG_TABLE \
|
| 848 | . = ALIGN(8); \
|
| 849 | __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
|
| 850 | __start___bug_table = .; \
|
| 851 | KEEP(*(__bug_table)) \
|
| 852 | __stop___bug_table = .; \
|
| 853 | }
|
| 854 | #else
|
| 855 | #define BUG_TABLE
|
| 856 | #endif
|
| 857 |
|
| 858 | #ifdef CONFIG_UNWINDER_ORC
|
| 859 | #define ORC_UNWIND_TABLE \
|
| 860 | . = ALIGN(4); \
|
| 861 | .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
|
| 862 | __start_orc_unwind_ip = .; \
|
| 863 | KEEP(*(.orc_unwind_ip)) \
|
| 864 | __stop_orc_unwind_ip = .; \
|
| 865 | } \
|
| 866 | . = ALIGN(2); \
|
| 867 | .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
|
| 868 | __start_orc_unwind = .; \
|
| 869 | KEEP(*(.orc_unwind)) \
|
| 870 | __stop_orc_unwind = .; \
|
| 871 | } \
|
| 872 | . = ALIGN(4); \
|
| 873 | .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
|
| 874 | orc_lookup = .; \
|
| 875 | . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
|
| 876 | LOOKUP_BLOCK_SIZE) + 1) * 4; \
|
| 877 | orc_lookup_end = .; \
|
| 878 | }
|
| 879 | #else
|
| 880 | #define ORC_UNWIND_TABLE
|
| 881 | #endif
|
| 882 |
|
| 883 | #ifdef CONFIG_PM_TRACE
|
| 884 | #define TRACEDATA \
|
| 885 | . = ALIGN(4); \
|
| 886 | .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
|
| 887 | __tracedata_start = .; \
|
| 888 | KEEP(*(.tracedata)) \
|
| 889 | __tracedata_end = .; \
|
| 890 | }
|
| 891 | #else
|
| 892 | #define TRACEDATA
|
| 893 | #endif
|
| 894 |
|
| 895 | #ifdef CONFIG_PRINTK_INDEX
|
| 896 | #define PRINTK_INDEX \
|
| 897 | .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \
|
| 898 | __start_printk_index = .; \
|
| 899 | *(.printk_index) \
|
| 900 | __stop_printk_index = .; \
|
| 901 | }
|
| 902 | #else
|
| 903 | #define PRINTK_INDEX
|
| 904 | #endif
|
| 905 |
|
| 906 | #define NOTES \
|
| 907 | .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
|
| 908 | __start_notes = .; \
|
| 909 | KEEP(*(.note.*)) \
|
| 910 | __stop_notes = .; \
|
| 911 | } NOTES_HEADERS \
|
| 912 | NOTES_HEADERS_RESTORE
|
| 913 |
|
| 914 | #define INIT_SETUP(initsetup_align) \
|
| 915 | . = ALIGN(initsetup_align); \
|
| 916 | __setup_start = .; \
|
| 917 | KEEP(*(.init.setup)) \
|
| 918 | __setup_end = .;
|
| 919 |
|
| 920 | #define INIT_CALLS_LEVEL(level) \
|
| 921 | __initcall##level##_start = .; \
|
| 922 | KEEP(*(.initcall##level##.init)) \
|
| 923 | KEEP(*(.initcall##level##s.init)) \
|
| 924 |
|
| 925 | #define INIT_CALLS \
|
| 926 | __initcall_start = .; \
|
| 927 | KEEP(*(.initcallearly.init)) \
|
| 928 | INIT_CALLS_LEVEL(0) \
|
| 929 | INIT_CALLS_LEVEL(1) \
|
| 930 | INIT_CALLS_LEVEL(2) \
|
| 931 | INIT_CALLS_LEVEL(3) \
|
| 932 | INIT_CALLS_LEVEL(4) \
|
| 933 | INIT_CALLS_LEVEL(5) \
|
| 934 | INIT_CALLS_LEVEL(rootfs) \
|
| 935 | INIT_CALLS_LEVEL(6) \
|
| 936 | INIT_CALLS_LEVEL(7) \
|
| 937 | __initcall_end = .;
|
| 938 |
|
| 939 | #define CON_INITCALL \
|
| 940 | __con_initcall_start = .; \
|
| 941 | KEEP(*(.con_initcall.init)) \
|
| 942 | __con_initcall_end = .;
|
| 943 |
|
| 944 |
|
| 945 | #define KUNIT_TABLE() \
|
| 946 | . = ALIGN(8); \
|
| 947 | __kunit_suites_start = .; \
|
| 948 | KEEP(*(.kunit_test_suites)) \
|
| 949 | __kunit_suites_end = .;
|
| 950 |
|
| 951 | #ifdef CONFIG_BLK_DEV_INITRD
|
| 952 | #define INIT_RAM_FS \
|
| 953 | . = ALIGN(4); \
|
| 954 | __initramfs_start = .; \
|
| 955 | KEEP(*(.init.ramfs)) \
|
| 956 | . = ALIGN(8); \
|
| 957 | KEEP(*(.init.ramfs.info))
|
| 958 | #else
|
| 959 | #define INIT_RAM_FS
|
| 960 | #endif
|
| 961 |
|
| 962 | |
| 963 | * Memory encryption operates on a page basis. Since we need to clear
|
| 964 | * the memory encryption mask for this section, it needs to be aligned
|
| 965 | * on a page boundary and be a page-size multiple in length.
|
| 966 | *
|
| 967 | * Note: We use a separate section so that only this section gets
|
| 968 | * decrypted to avoid exposing more than we wish.
|
| 969 |
|
| 970 | #ifdef CONFIG_AMD_MEM_ENCRYPT
|
| 971 | #define PERCPU_DECRYPTED_SECTION \
|
| 972 | . = ALIGN(PAGE_SIZE); \
|
| 973 | *(.data..decrypted) \
|
| 974 | *(.data..percpu..decrypted) \
|
| 975 | . = ALIGN(PAGE_SIZE);
|
| 976 | #else
|
| 977 | #define PERCPU_DECRYPTED_SECTION
|
| 978 | #endif
|
| 979 |
|
| 980 |
|
| 981 | |
| 982 | * Default discarded sections.
|
| 983 | *
|
| 984 | * Some archs want to discard exit text/data at runtime rather than
|
| 985 | * link time due to cross-section references such as alt instructions,
|
| 986 | * bug table, eh_frame, etc. DISCARDS must be the last of output
|
| 987 | * section definitions so that such archs put those in earlier section
|
| 988 | * definitions.
|
| 989 |
|
| 990 | #ifdef RUNTIME_DISCARD_EXIT
|
| 991 | #define EXIT_DISCARDS
|
| 992 | #else
|
| 993 | #define EXIT_DISCARDS \
|
| 994 | EXIT_TEXT \
|
| 995 | EXIT_DATA
|
| 996 | #endif
|
| 997 |
|
| 998 | |
| 999 | * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
|
| 1000 | * -fsanitize=thread produce unwanted sections (.eh_frame
|
| 1001 | * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
|
| 1002 | * keep any .init_array.* sections.
|
| 1003 | * https://bugs.llvm.org/show_bug.cgi?id=46478
|
| 1004 |
|
| 1005 | #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \
|
| 1006 | defined(CONFIG_CFI_CLANG)
|
| 1007 | # ifdef CONFIG_CONSTRUCTORS
|
| 1008 | # define SANITIZER_DISCARDS \
|
| 1009 | *(.eh_frame)
|
| 1010 | # else
|
| 1011 | # define SANITIZER_DISCARDS \
|
| 1012 | *(.init_array) *(.init_array.*) \
|
| 1013 | *(.eh_frame)
|
| 1014 | # endif
|
| 1015 | #else
|
| 1016 | # define SANITIZER_DISCARDS
|
| 1017 | #endif
|
| 1018 |
|
| 1019 | #define COMMON_DISCARDS \
|
| 1020 | SANITIZER_DISCARDS \
|
| 1021 | *(.discard) \
|
| 1022 | *(.discard.*) \
|
| 1023 | *(.modinfo) \
|
| 1024 | \
|
| 1025 | *(.gnu.version*) \
|
| 1026 |
|
| 1027 | #define DISCARDS \
|
| 1028 | /DISCARD/ : { \
|
| 1029 | EXIT_DISCARDS \
|
| 1030 | EXIT_CALL \
|
| 1031 | COMMON_DISCARDS \
|
| 1032 | }
|
| 1033 |
|
| 1034 | |
| 1035 | * PERCPU_INPUT - the percpu input sections
|
| 1036 | * @cacheline: cacheline size
|
| 1037 | *
|
| 1038 | * The core percpu section names and core symbols which do not rely
|
| 1039 | * directly upon load addresses.
|
| 1040 | *
|
| 1041 | * @cacheline is used to align subsections to avoid false cacheline
|
| 1042 | * sharing between subsections for different purposes.
|
| 1043 |
|
| 1044 | #define PERCPU_INPUT(cacheline) \
|
| 1045 | __per_cpu_start = .; \
|
| 1046 | *(.data..percpu..first) \
|
| 1047 | . = ALIGN(PAGE_SIZE); \
|
| 1048 | *(.data..percpu..page_aligned) \
|
| 1049 | . = ALIGN(cacheline); \
|
| 1050 | *(.data..percpu..read_mostly) \
|
| 1051 | . = ALIGN(cacheline); \
|
| 1052 | *(.data..percpu) \
|
| 1053 | *(.data..percpu..shared_aligned) \
|
| 1054 | PERCPU_DECRYPTED_SECTION \
|
| 1055 | __per_cpu_end = .;
|
| 1056 |
|
| 1057 | |
| 1058 | * PERCPU_VADDR - define output section for percpu area
|
| 1059 | * @cacheline: cacheline size
|
| 1060 | * @vaddr: explicit base address (optional)
|
| 1061 | * @phdr: destination PHDR (optional)
|
| 1062 | *
|
| 1063 | * Macro which expands to output section for percpu area.
|
| 1064 | *
|
| 1065 | * @cacheline is used to align subsections to avoid false cacheline
|
| 1066 | * sharing between subsections for different purposes.
|
| 1067 | *
|
| 1068 | * If @vaddr is not blank, it specifies explicit base address and all
|
| 1069 | * percpu symbols will be offset from the given address. If blank,
|
| 1070 | * @vaddr always equals @laddr + LOAD_OFFSET.
|
| 1071 | *
|
| 1072 | * @phdr defines the output PHDR to use if not blank. Be warned that
|
| 1073 | * output PHDR is sticky. If @phdr is specified, the next output
|
| 1074 | * section in the linker script will go there too. @phdr should have
|
| 1075 | * a leading colon.
|
| 1076 | *
|
| 1077 | * Note that this macros defines __per_cpu_load as an absolute symbol.
|
| 1078 | * If there is no need to put the percpu section at a predetermined
|
| 1079 | * address, use PERCPU_SECTION.
|
| 1080 |
|
| 1081 | #define PERCPU_VADDR(cacheline, vaddr, phdr) \
|
| 1082 | __per_cpu_load = .; \
|
| 1083 | .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
|
| 1084 | PERCPU_INPUT(cacheline) \
|
| 1085 | } phdr \
|
| 1086 | . = __per_cpu_load + SIZEOF(.data..percpu);
|
| 1087 |
|
| 1088 | |
| 1089 | * PERCPU_SECTION - define output section for percpu area, simple version
|
| 1090 | * @cacheline: cacheline size
|
| 1091 | *
|
| 1092 | * Align to PAGE_SIZE and outputs output section for percpu area. This
|
| 1093 | * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
|
| 1094 | * __per_cpu_start will be identical.
|
| 1095 | *
|
| 1096 | * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
|
| 1097 | * except that __per_cpu_load is defined as a relative symbol against
|
| 1098 | * .data..percpu which is required for relocatable x86_32 configuration.
|
| 1099 |
|
| 1100 | #define PERCPU_SECTION(cacheline) \
|
| 1101 | . = ALIGN(PAGE_SIZE); \
|
| 1102 | .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
|
| 1103 | __per_cpu_load = .; \
|
| 1104 | PERCPU_INPUT(cacheline) \
|
| 1105 | }
|
| 1106 |
|
| 1107 |
|
| 1108 | |
| 1109 | * Definition of the high level *_SECTION macros
|
| 1110 | * They will fit only a subset of the architectures
|
| 1111 |
|
| 1112 |
|
| 1113 |
|
| 1114 | |
| 1115 | * Writeable data.
|
| 1116 | * All sections are combined in a single .data section.
|
| 1117 | * The sections following CONSTRUCTORS are arranged so their
|
| 1118 | * typical alignment matches.
|
| 1119 | * A cacheline is typical/always less than a PAGE_SIZE so
|
| 1120 | * the sections that has this restriction (or similar)
|
| 1121 | * is located before the ones requiring PAGE_SIZE alignment.
|
| 1122 | * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
|
| 1123 | * matches the requirement of PAGE_ALIGNED_DATA.
|
| 1124 | *
|
| 1125 | * use 0 as page_align if page_aligned data is not used
|
| 1126 | #define RW_DATA(cacheline, pagealigned, inittask) \
|
| 1127 | . = ALIGN(PAGE_SIZE); \
|
| 1128 | .data : AT(ADDR(.data) - LOAD_OFFSET) { \
|
| 1129 | INIT_TASK_DATA(inittask) \
|
| 1130 | NOSAVE_DATA \
|
| 1131 | PAGE_ALIGNED_DATA(pagealigned) \
|
| 1132 | CACHELINE_ALIGNED_DATA(cacheline) \
|
| 1133 | READ_MOSTLY_DATA(cacheline) \
|
| 1134 | DATA_DATA \
|
| 1135 | CONSTRUCTORS \
|
| 1136 | } \
|
| 1137 | BUG_TABLE \
|
| 1138 |
|
| 1139 | #define INIT_TEXT_SECTION(inittext_align) \
|
| 1140 | . = ALIGN(inittext_align); \
|
| 1141 | .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
|
| 1142 | _sinittext = .; \
|
| 1143 | INIT_TEXT \
|
| 1144 | _einittext = .; \
|
| 1145 | }
|
| 1146 |
|
| 1147 | #define INIT_DATA_SECTION(initsetup_align) \
|
| 1148 | .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
|
| 1149 | INIT_DATA \
|
| 1150 | INIT_SETUP(initsetup_align) \
|
| 1151 | INIT_CALLS \
|
| 1152 | CON_INITCALL \
|
| 1153 | INIT_RAM_FS \
|
| 1154 | }
|
| 1155 |
|
| 1156 | #define BSS_SECTION(sbss_align, bss_align, stop_align) \
|
| 1157 | . = ALIGN(sbss_align); \
|
| 1158 | __bss_start = .; \
|
| 1159 | SBSS(sbss_align) \
|
| 1160 | BSS(bss_align) \
|
| 1161 | . = ALIGN(stop_align); \
|
| 1162 | __bss_stop = .;
|