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1133 lines
31 KiB
1133 lines
31 KiB
/* |
|
* Helper macros to support writing architecture specific |
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* linker scripts. |
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* |
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* A minimal linker scripts has following content: |
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* [This is a sample, architectures may have special requiriements] |
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* |
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* OUTPUT_FORMAT(...) |
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* OUTPUT_ARCH(...) |
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* ENTRY(...) |
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* SECTIONS |
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* { |
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* . = START; |
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* __init_begin = .; |
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* HEAD_TEXT_SECTION |
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* INIT_TEXT_SECTION(PAGE_SIZE) |
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* INIT_DATA_SECTION(...) |
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* PERCPU_SECTION(CACHELINE_SIZE) |
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* __init_end = .; |
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* |
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* _stext = .; |
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* TEXT_SECTION = 0 |
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* _etext = .; |
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* |
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* _sdata = .; |
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* RO_DATA(PAGE_SIZE) |
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* RW_DATA(...) |
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* _edata = .; |
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* |
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* EXCEPTION_TABLE(...) |
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* |
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* BSS_SECTION(0, 0, 0) |
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* _end = .; |
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* |
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* STABS_DEBUG |
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* DWARF_DEBUG |
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* ELF_DETAILS |
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* |
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* DISCARDS // must be the last |
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* } |
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* |
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* [__init_begin, __init_end] is the init section that may be freed after init |
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* // __init_begin and __init_end should be page aligned, so that we can |
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* // free the whole .init memory |
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* [_stext, _etext] is the text section |
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* [_sdata, _edata] is the data section |
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* |
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* Some of the included output section have their own set of constants. |
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* Examples are: [__initramfs_start, __initramfs_end] for initramfs and |
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* [__nosave_begin, __nosave_end] for the nosave data |
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*/ |
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|
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#ifndef LOAD_OFFSET |
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#define LOAD_OFFSET 0 |
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#endif |
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|
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/* |
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* Only some architectures want to have the .notes segment visible in |
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* a separate PT_NOTE ELF Program Header. When this happens, it needs |
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* to be visible in both the kernel text's PT_LOAD and the PT_NOTE |
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* Program Headers. In this case, though, the PT_LOAD needs to be made |
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* the default again so that all the following sections don't also end |
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* up in the PT_NOTE Program Header. |
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*/ |
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#ifdef EMITS_PT_NOTE |
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#define NOTES_HEADERS :text :note |
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#define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text |
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#else |
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#define NOTES_HEADERS |
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#define NOTES_HEADERS_RESTORE |
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#endif |
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|
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/* |
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* Some architectures have non-executable read-only exception tables. |
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* They can be added to the RO_DATA segment by specifying their desired |
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* alignment. |
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*/ |
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#ifdef RO_EXCEPTION_TABLE_ALIGN |
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#define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) |
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#else |
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#define RO_EXCEPTION_TABLE |
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#endif |
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|
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/* Align . to a 8 byte boundary equals to maximum function alignment. */ |
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#define ALIGN_FUNCTION() . = ALIGN(8) |
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|
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/* |
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* LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which |
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* generates .data.identifier sections, which need to be pulled in with |
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* .data. We don't want to pull in .data..other sections, which Linux |
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* has defined. Same for text and bss. |
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* |
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* With LTO_CLANG, the linker also splits sections by default, so we need |
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* these macros to combine the sections during the final link. |
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* |
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* RODATA_MAIN is not used because existing code already defines .rodata.x |
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* sections to be brought in with rodata. |
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*/ |
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#if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG) |
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#define TEXT_MAIN .text .text.[0-9a-zA-Z_]* |
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#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L* |
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#define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* |
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#define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* |
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#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral* |
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#define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* |
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#else |
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#define TEXT_MAIN .text |
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#define DATA_MAIN .data |
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#define SDATA_MAIN .sdata |
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#define RODATA_MAIN .rodata |
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#define BSS_MAIN .bss |
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#define SBSS_MAIN .sbss |
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#endif |
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|
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/* |
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* GCC 4.5 and later have a 32 bytes section alignment for structures. |
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* Except GCC 4.9, that feels the need to align on 64 bytes. |
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*/ |
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#if __GNUC__ == 4 && __GNUC_MINOR__ == 9 |
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#define STRUCT_ALIGNMENT 64 |
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#else |
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#define STRUCT_ALIGNMENT 32 |
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#endif |
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#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) |
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|
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/* |
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* The order of the sched class addresses are important, as they are |
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* used to determine the order of the priority of each sched class in |
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* relation to each other. |
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*/ |
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#define SCHED_DATA \ |
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STRUCT_ALIGN(); \ |
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__begin_sched_classes = .; \ |
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*(__idle_sched_class) \ |
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*(__fair_sched_class) \ |
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*(__rt_sched_class) \ |
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*(__dl_sched_class) \ |
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*(__stop_sched_class) \ |
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__end_sched_classes = .; |
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|
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/* The actual configuration determine if the init/exit sections |
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* are handled as text/data or they can be discarded (which |
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* often happens at runtime) |
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*/ |
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#ifdef CONFIG_HOTPLUG_CPU |
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#define CPU_KEEP(sec) *(.cpu##sec) |
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#define CPU_DISCARD(sec) |
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#else |
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#define CPU_KEEP(sec) |
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#define CPU_DISCARD(sec) *(.cpu##sec) |
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#endif |
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|
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#if defined(CONFIG_MEMORY_HOTPLUG) |
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#define MEM_KEEP(sec) *(.mem##sec) |
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#define MEM_DISCARD(sec) |
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#else |
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#define MEM_KEEP(sec) |
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#define MEM_DISCARD(sec) *(.mem##sec) |
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#endif |
|
|
|
#ifdef CONFIG_FTRACE_MCOUNT_RECORD |
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/* |
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* The ftrace call sites are logged to a section whose name depends on the |
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* compiler option used. A given kernel image will only use one, AKA |
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* FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header |
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* dependencies for FTRACE_CALLSITE_SECTION's definition. |
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* |
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* Need to also make ftrace_stub_graph point to ftrace_stub |
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* so that the same stub location may have different protocols |
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* and not mess up with C verifiers. |
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*/ |
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#define MCOUNT_REC() . = ALIGN(8); \ |
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__start_mcount_loc = .; \ |
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KEEP(*(__mcount_loc)) \ |
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KEEP(*(__patchable_function_entries)) \ |
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__stop_mcount_loc = .; \ |
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ftrace_stub_graph = ftrace_stub; |
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#else |
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# ifdef CONFIG_FUNCTION_TRACER |
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# define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; |
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# else |
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# define MCOUNT_REC() |
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# endif |
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#endif |
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|
|
#ifdef CONFIG_TRACE_BRANCH_PROFILING |
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#define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ |
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KEEP(*(_ftrace_annotated_branch)) \ |
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__stop_annotated_branch_profile = .; |
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#else |
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#define LIKELY_PROFILE() |
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#endif |
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|
|
#ifdef CONFIG_PROFILE_ALL_BRANCHES |
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#define BRANCH_PROFILE() __start_branch_profile = .; \ |
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KEEP(*(_ftrace_branch)) \ |
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__stop_branch_profile = .; |
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#else |
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#define BRANCH_PROFILE() |
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#endif |
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|
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#ifdef CONFIG_KPROBES |
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#define KPROBE_BLACKLIST() . = ALIGN(8); \ |
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__start_kprobe_blacklist = .; \ |
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KEEP(*(_kprobe_blacklist)) \ |
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__stop_kprobe_blacklist = .; |
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#else |
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#define KPROBE_BLACKLIST() |
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#endif |
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|
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#ifdef CONFIG_FUNCTION_ERROR_INJECTION |
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#define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ |
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__start_error_injection_whitelist = .; \ |
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KEEP(*(_error_injection_whitelist)) \ |
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__stop_error_injection_whitelist = .; |
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#else |
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#define ERROR_INJECT_WHITELIST() |
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#endif |
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|
|
#ifdef CONFIG_EVENT_TRACING |
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#define FTRACE_EVENTS() . = ALIGN(8); \ |
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__start_ftrace_events = .; \ |
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KEEP(*(_ftrace_events)) \ |
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__stop_ftrace_events = .; \ |
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__start_ftrace_eval_maps = .; \ |
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KEEP(*(_ftrace_eval_map)) \ |
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__stop_ftrace_eval_maps = .; |
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#else |
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#define FTRACE_EVENTS() |
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#endif |
|
|
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#ifdef CONFIG_TRACING |
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#define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ |
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KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ |
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__stop___trace_bprintk_fmt = .; |
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#define TRACEPOINT_STR() __start___tracepoint_str = .; \ |
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KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ |
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__stop___tracepoint_str = .; |
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#else |
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#define TRACE_PRINTKS() |
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#define TRACEPOINT_STR() |
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#endif |
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|
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#ifdef CONFIG_FTRACE_SYSCALLS |
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#define TRACE_SYSCALLS() . = ALIGN(8); \ |
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__start_syscalls_metadata = .; \ |
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KEEP(*(__syscalls_metadata)) \ |
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__stop_syscalls_metadata = .; |
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#else |
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#define TRACE_SYSCALLS() |
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#endif |
|
|
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#ifdef CONFIG_BPF_EVENTS |
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#define BPF_RAW_TP() STRUCT_ALIGN(); \ |
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__start__bpf_raw_tp = .; \ |
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KEEP(*(__bpf_raw_tp_map)) \ |
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__stop__bpf_raw_tp = .; |
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#else |
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#define BPF_RAW_TP() |
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#endif |
|
|
|
#ifdef CONFIG_SERIAL_EARLYCON |
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#define EARLYCON_TABLE() . = ALIGN(8); \ |
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__earlycon_table = .; \ |
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KEEP(*(__earlycon_table)) \ |
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__earlycon_table_end = .; |
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#else |
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#define EARLYCON_TABLE() |
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#endif |
|
|
|
#ifdef CONFIG_SECURITY |
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#define LSM_TABLE() . = ALIGN(8); \ |
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__start_lsm_info = .; \ |
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KEEP(*(.lsm_info.init)) \ |
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__end_lsm_info = .; |
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#define EARLY_LSM_TABLE() . = ALIGN(8); \ |
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__start_early_lsm_info = .; \ |
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KEEP(*(.early_lsm_info.init)) \ |
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__end_early_lsm_info = .; |
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#else |
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#define LSM_TABLE() |
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#define EARLY_LSM_TABLE() |
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#endif |
|
|
|
#define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) |
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#define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) |
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#define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) |
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#define _OF_TABLE_0(name) |
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#define _OF_TABLE_1(name) \ |
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. = ALIGN(8); \ |
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__##name##_of_table = .; \ |
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KEEP(*(__##name##_of_table)) \ |
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KEEP(*(__##name##_of_table_end)) |
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|
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#define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) |
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#define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) |
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#define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) |
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#define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) |
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#define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) |
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#define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) |
|
|
|
#ifdef CONFIG_ACPI |
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#define ACPI_PROBE_TABLE(name) \ |
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. = ALIGN(8); \ |
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__##name##_acpi_probe_table = .; \ |
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KEEP(*(__##name##_acpi_probe_table)) \ |
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__##name##_acpi_probe_table_end = .; |
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#else |
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#define ACPI_PROBE_TABLE(name) |
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#endif |
|
|
|
#ifdef CONFIG_THERMAL |
|
#define THERMAL_TABLE(name) \ |
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. = ALIGN(8); \ |
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__##name##_thermal_table = .; \ |
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KEEP(*(__##name##_thermal_table)) \ |
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__##name##_thermal_table_end = .; |
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#else |
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#define THERMAL_TABLE(name) |
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#endif |
|
|
|
#ifdef CONFIG_DTPM |
|
#define DTPM_TABLE() \ |
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. = ALIGN(8); \ |
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__dtpm_table = .; \ |
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KEEP(*(__dtpm_table)) \ |
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__dtpm_table_end = .; |
|
#else |
|
#define DTPM_TABLE() |
|
#endif |
|
|
|
#define KERNEL_DTB() \ |
|
STRUCT_ALIGN(); \ |
|
__dtb_start = .; \ |
|
KEEP(*(.dtb.init.rodata)) \ |
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__dtb_end = .; |
|
|
|
/* |
|
* .data section |
|
*/ |
|
#define DATA_DATA \ |
|
*(.xiptext) \ |
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*(DATA_MAIN) \ |
|
*(.ref.data) \ |
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*(.data..shared_aligned) /* percpu related */ \ |
|
MEM_KEEP(init.data*) \ |
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MEM_KEEP(exit.data*) \ |
|
*(.data.unlikely) \ |
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__start_once = .; \ |
|
*(.data.once) \ |
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__end_once = .; \ |
|
STRUCT_ALIGN(); \ |
|
*(__tracepoints) \ |
|
/* implement dynamic printk debug */ \ |
|
. = ALIGN(8); \ |
|
__start___dyndbg = .; \ |
|
KEEP(*(__dyndbg)) \ |
|
__stop___dyndbg = .; \ |
|
LIKELY_PROFILE() \ |
|
BRANCH_PROFILE() \ |
|
TRACE_PRINTKS() \ |
|
BPF_RAW_TP() \ |
|
TRACEPOINT_STR() |
|
|
|
/* |
|
* Data section helpers |
|
*/ |
|
#define NOSAVE_DATA \ |
|
. = ALIGN(PAGE_SIZE); \ |
|
__nosave_begin = .; \ |
|
*(.data..nosave) \ |
|
. = ALIGN(PAGE_SIZE); \ |
|
__nosave_end = .; |
|
|
|
#define PAGE_ALIGNED_DATA(page_align) \ |
|
. = ALIGN(page_align); \ |
|
*(.data..page_aligned) \ |
|
. = ALIGN(page_align); |
|
|
|
#define READ_MOSTLY_DATA(align) \ |
|
. = ALIGN(align); \ |
|
*(.data..read_mostly) \ |
|
. = ALIGN(align); |
|
|
|
#define CACHELINE_ALIGNED_DATA(align) \ |
|
. = ALIGN(align); \ |
|
*(.data..cacheline_aligned) |
|
|
|
#define INIT_TASK_DATA(align) \ |
|
. = ALIGN(align); \ |
|
__start_init_task = .; \ |
|
init_thread_union = .; \ |
|
init_stack = .; \ |
|
KEEP(*(.data..init_task)) \ |
|
KEEP(*(.data..init_thread_info)) \ |
|
. = __start_init_task + THREAD_SIZE; \ |
|
__end_init_task = .; |
|
|
|
#define JUMP_TABLE_DATA \ |
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. = ALIGN(8); \ |
|
__start___jump_table = .; \ |
|
KEEP(*(__jump_table)) \ |
|
__stop___jump_table = .; |
|
|
|
#define STATIC_CALL_DATA \ |
|
. = ALIGN(8); \ |
|
__start_static_call_sites = .; \ |
|
KEEP(*(.static_call_sites)) \ |
|
__stop_static_call_sites = .; \ |
|
__start_static_call_tramp_key = .; \ |
|
KEEP(*(.static_call_tramp_key)) \ |
|
__stop_static_call_tramp_key = .; |
|
|
|
/* |
|
* Allow architectures to handle ro_after_init data on their |
|
* own by defining an empty RO_AFTER_INIT_DATA. |
|
*/ |
|
#ifndef RO_AFTER_INIT_DATA |
|
#define RO_AFTER_INIT_DATA \ |
|
. = ALIGN(8); \ |
|
__start_ro_after_init = .; \ |
|
*(.data..ro_after_init) \ |
|
JUMP_TABLE_DATA \ |
|
STATIC_CALL_DATA \ |
|
__end_ro_after_init = .; |
|
#endif |
|
|
|
/* |
|
* Read only Data |
|
*/ |
|
#define RO_DATA(align) \ |
|
. = ALIGN((align)); \ |
|
.rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ |
|
__start_rodata = .; \ |
|
*(.rodata) *(.rodata.*) \ |
|
SCHED_DATA \ |
|
RO_AFTER_INIT_DATA /* Read only after init */ \ |
|
. = ALIGN(8); \ |
|
__start___tracepoints_ptrs = .; \ |
|
KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ |
|
__stop___tracepoints_ptrs = .; \ |
|
*(__tracepoints_strings)/* Tracepoints: strings */ \ |
|
} \ |
|
\ |
|
.rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ |
|
*(.rodata1) \ |
|
} \ |
|
\ |
|
/* PCI quirks */ \ |
|
.pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ |
|
__start_pci_fixups_early = .; \ |
|
KEEP(*(.pci_fixup_early)) \ |
|
__end_pci_fixups_early = .; \ |
|
__start_pci_fixups_header = .; \ |
|
KEEP(*(.pci_fixup_header)) \ |
|
__end_pci_fixups_header = .; \ |
|
__start_pci_fixups_final = .; \ |
|
KEEP(*(.pci_fixup_final)) \ |
|
__end_pci_fixups_final = .; \ |
|
__start_pci_fixups_enable = .; \ |
|
KEEP(*(.pci_fixup_enable)) \ |
|
__end_pci_fixups_enable = .; \ |
|
__start_pci_fixups_resume = .; \ |
|
KEEP(*(.pci_fixup_resume)) \ |
|
__end_pci_fixups_resume = .; \ |
|
__start_pci_fixups_resume_early = .; \ |
|
KEEP(*(.pci_fixup_resume_early)) \ |
|
__end_pci_fixups_resume_early = .; \ |
|
__start_pci_fixups_suspend = .; \ |
|
KEEP(*(.pci_fixup_suspend)) \ |
|
__end_pci_fixups_suspend = .; \ |
|
__start_pci_fixups_suspend_late = .; \ |
|
KEEP(*(.pci_fixup_suspend_late)) \ |
|
__end_pci_fixups_suspend_late = .; \ |
|
} \ |
|
\ |
|
/* Built-in firmware blobs */ \ |
|
.builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ |
|
__start_builtin_fw = .; \ |
|
KEEP(*(.builtin_fw)) \ |
|
__end_builtin_fw = .; \ |
|
} \ |
|
\ |
|
TRACEDATA \ |
|
\ |
|
/* Kernel symbol table: Normal symbols */ \ |
|
__ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ |
|
__start___ksymtab = .; \ |
|
KEEP(*(SORT(___ksymtab+*))) \ |
|
__stop___ksymtab = .; \ |
|
} \ |
|
\ |
|
/* Kernel symbol table: GPL-only symbols */ \ |
|
__ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ |
|
__start___ksymtab_gpl = .; \ |
|
KEEP(*(SORT(___ksymtab_gpl+*))) \ |
|
__stop___ksymtab_gpl = .; \ |
|
} \ |
|
\ |
|
/* Kernel symbol table: Normal symbols */ \ |
|
__kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ |
|
__start___kcrctab = .; \ |
|
KEEP(*(SORT(___kcrctab+*))) \ |
|
__stop___kcrctab = .; \ |
|
} \ |
|
\ |
|
/* Kernel symbol table: GPL-only symbols */ \ |
|
__kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ |
|
__start___kcrctab_gpl = .; \ |
|
KEEP(*(SORT(___kcrctab_gpl+*))) \ |
|
__stop___kcrctab_gpl = .; \ |
|
} \ |
|
\ |
|
/* Kernel symbol table: strings */ \ |
|
__ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ |
|
*(__ksymtab_strings) \ |
|
} \ |
|
\ |
|
/* __*init sections */ \ |
|
__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ |
|
*(.ref.rodata) \ |
|
MEM_KEEP(init.rodata) \ |
|
MEM_KEEP(exit.rodata) \ |
|
} \ |
|
\ |
|
/* Built-in module parameters. */ \ |
|
__param : AT(ADDR(__param) - LOAD_OFFSET) { \ |
|
__start___param = .; \ |
|
KEEP(*(__param)) \ |
|
__stop___param = .; \ |
|
} \ |
|
\ |
|
/* Built-in module versions. */ \ |
|
__modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ |
|
__start___modver = .; \ |
|
KEEP(*(__modver)) \ |
|
__stop___modver = .; \ |
|
} \ |
|
\ |
|
RO_EXCEPTION_TABLE \ |
|
NOTES \ |
|
BTF \ |
|
\ |
|
. = ALIGN((align)); \ |
|
__end_rodata = .; |
|
|
|
/* |
|
* Non-instrumentable text section |
|
*/ |
|
#define NOINSTR_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
__noinstr_text_start = .; \ |
|
*(.noinstr.text) \ |
|
__noinstr_text_end = .; |
|
|
|
/* |
|
* .text section. Map to function alignment to avoid address changes |
|
* during second ld run in second ld pass when generating System.map |
|
* |
|
* TEXT_MAIN here will match .text.fixup and .text.unlikely if dead |
|
* code elimination is enabled, so these sections should be converted |
|
* to use ".." first. |
|
*/ |
|
#define TEXT_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
*(.text.hot .text.hot.*) \ |
|
*(TEXT_MAIN .text.fixup) \ |
|
*(.text.unlikely .text.unlikely.*) \ |
|
*(.text.unknown .text.unknown.*) \ |
|
NOINSTR_TEXT \ |
|
*(.text..refcount) \ |
|
*(.ref.text) \ |
|
MEM_KEEP(init.text*) \ |
|
MEM_KEEP(exit.text*) \ |
|
|
|
|
|
/* sched.text is aling to function alignment to secure we have same |
|
* address even at second ld pass when generating System.map */ |
|
#define SCHED_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
__sched_text_start = .; \ |
|
*(.sched.text) \ |
|
__sched_text_end = .; |
|
|
|
/* spinlock.text is aling to function alignment to secure we have same |
|
* address even at second ld pass when generating System.map */ |
|
#define LOCK_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
__lock_text_start = .; \ |
|
*(.spinlock.text) \ |
|
__lock_text_end = .; |
|
|
|
#define CPUIDLE_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
__cpuidle_text_start = .; \ |
|
*(.cpuidle.text) \ |
|
__cpuidle_text_end = .; |
|
|
|
#define KPROBES_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
__kprobes_text_start = .; \ |
|
*(.kprobes.text) \ |
|
__kprobes_text_end = .; |
|
|
|
#define ENTRY_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
__entry_text_start = .; \ |
|
*(.entry.text) \ |
|
__entry_text_end = .; |
|
|
|
#define IRQENTRY_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
__irqentry_text_start = .; \ |
|
*(.irqentry.text) \ |
|
__irqentry_text_end = .; |
|
|
|
#define SOFTIRQENTRY_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
__softirqentry_text_start = .; \ |
|
*(.softirqentry.text) \ |
|
__softirqentry_text_end = .; |
|
|
|
#define STATIC_CALL_TEXT \ |
|
ALIGN_FUNCTION(); \ |
|
__static_call_text_start = .; \ |
|
*(.static_call.text) \ |
|
__static_call_text_end = .; |
|
|
|
/* Section used for early init (in .S files) */ |
|
#define HEAD_TEXT KEEP(*(.head.text)) |
|
|
|
#define HEAD_TEXT_SECTION \ |
|
.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ |
|
HEAD_TEXT \ |
|
} |
|
|
|
/* |
|
* Exception table |
|
*/ |
|
#define EXCEPTION_TABLE(align) \ |
|
. = ALIGN(align); \ |
|
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ |
|
__start___ex_table = .; \ |
|
KEEP(*(__ex_table)) \ |
|
__stop___ex_table = .; \ |
|
} |
|
|
|
/* |
|
* .BTF |
|
*/ |
|
#ifdef CONFIG_DEBUG_INFO_BTF |
|
#define BTF \ |
|
.BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ |
|
__start_BTF = .; \ |
|
KEEP(*(.BTF)) \ |
|
__stop_BTF = .; \ |
|
} \ |
|
. = ALIGN(4); \ |
|
.BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ |
|
*(.BTF_ids) \ |
|
} |
|
#else |
|
#define BTF |
|
#endif |
|
|
|
/* |
|
* Init task |
|
*/ |
|
#define INIT_TASK_DATA_SECTION(align) \ |
|
. = ALIGN(align); \ |
|
.data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ |
|
INIT_TASK_DATA(align) \ |
|
} |
|
|
|
#ifdef CONFIG_CONSTRUCTORS |
|
#define KERNEL_CTORS() . = ALIGN(8); \ |
|
__ctors_start = .; \ |
|
KEEP(*(SORT(.ctors.*))) \ |
|
KEEP(*(.ctors)) \ |
|
KEEP(*(SORT(.init_array.*))) \ |
|
KEEP(*(.init_array)) \ |
|
__ctors_end = .; |
|
#else |
|
#define KERNEL_CTORS() |
|
#endif |
|
|
|
/* init and exit section handling */ |
|
#define INIT_DATA \ |
|
KEEP(*(SORT(___kentry+*))) \ |
|
*(.init.data init.data.*) \ |
|
MEM_DISCARD(init.data*) \ |
|
KERNEL_CTORS() \ |
|
MCOUNT_REC() \ |
|
*(.init.rodata .init.rodata.*) \ |
|
FTRACE_EVENTS() \ |
|
TRACE_SYSCALLS() \ |
|
KPROBE_BLACKLIST() \ |
|
ERROR_INJECT_WHITELIST() \ |
|
MEM_DISCARD(init.rodata) \ |
|
CLK_OF_TABLES() \ |
|
RESERVEDMEM_OF_TABLES() \ |
|
TIMER_OF_TABLES() \ |
|
CPU_METHOD_OF_TABLES() \ |
|
CPUIDLE_METHOD_OF_TABLES() \ |
|
KERNEL_DTB() \ |
|
IRQCHIP_OF_MATCH_TABLE() \ |
|
ACPI_PROBE_TABLE(irqchip) \ |
|
ACPI_PROBE_TABLE(timer) \ |
|
THERMAL_TABLE(governor) \ |
|
DTPM_TABLE() \ |
|
EARLYCON_TABLE() \ |
|
LSM_TABLE() \ |
|
EARLY_LSM_TABLE() \ |
|
KUNIT_TABLE() |
|
|
|
#define INIT_TEXT \ |
|
*(.init.text .init.text.*) \ |
|
*(.text.startup) \ |
|
MEM_DISCARD(init.text*) |
|
|
|
#define EXIT_DATA \ |
|
*(.exit.data .exit.data.*) \ |
|
*(.fini_array .fini_array.*) \ |
|
*(.dtors .dtors.*) \ |
|
MEM_DISCARD(exit.data*) \ |
|
MEM_DISCARD(exit.rodata*) |
|
|
|
#define EXIT_TEXT \ |
|
*(.exit.text) \ |
|
*(.text.exit) \ |
|
MEM_DISCARD(exit.text) |
|
|
|
#define EXIT_CALL \ |
|
*(.exitcall.exit) |
|
|
|
/* |
|
* bss (Block Started by Symbol) - uninitialized data |
|
* zeroed during startup |
|
*/ |
|
#define SBSS(sbss_align) \ |
|
. = ALIGN(sbss_align); \ |
|
.sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ |
|
*(.dynsbss) \ |
|
*(SBSS_MAIN) \ |
|
*(.scommon) \ |
|
} |
|
|
|
/* |
|
* Allow archectures to redefine BSS_FIRST_SECTIONS to add extra |
|
* sections to the front of bss. |
|
*/ |
|
#ifndef BSS_FIRST_SECTIONS |
|
#define BSS_FIRST_SECTIONS |
|
#endif |
|
|
|
#define BSS(bss_align) \ |
|
. = ALIGN(bss_align); \ |
|
.bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ |
|
BSS_FIRST_SECTIONS \ |
|
. = ALIGN(PAGE_SIZE); \ |
|
*(.bss..page_aligned) \ |
|
. = ALIGN(PAGE_SIZE); \ |
|
*(.dynbss) \ |
|
*(BSS_MAIN) \ |
|
*(COMMON) \ |
|
} |
|
|
|
/* |
|
* DWARF debug sections. |
|
* Symbols in the DWARF debugging sections are relative to |
|
* the beginning of the section so we begin them at 0. |
|
*/ |
|
#define DWARF_DEBUG \ |
|
/* DWARF 1 */ \ |
|
.debug 0 : { *(.debug) } \ |
|
.line 0 : { *(.line) } \ |
|
/* GNU DWARF 1 extensions */ \ |
|
.debug_srcinfo 0 : { *(.debug_srcinfo) } \ |
|
.debug_sfnames 0 : { *(.debug_sfnames) } \ |
|
/* DWARF 1.1 and DWARF 2 */ \ |
|
.debug_aranges 0 : { *(.debug_aranges) } \ |
|
.debug_pubnames 0 : { *(.debug_pubnames) } \ |
|
/* DWARF 2 */ \ |
|
.debug_info 0 : { *(.debug_info \ |
|
.gnu.linkonce.wi.*) } \ |
|
.debug_abbrev 0 : { *(.debug_abbrev) } \ |
|
.debug_line 0 : { *(.debug_line) } \ |
|
.debug_frame 0 : { *(.debug_frame) } \ |
|
.debug_str 0 : { *(.debug_str) } \ |
|
.debug_loc 0 : { *(.debug_loc) } \ |
|
.debug_macinfo 0 : { *(.debug_macinfo) } \ |
|
.debug_pubtypes 0 : { *(.debug_pubtypes) } \ |
|
/* DWARF 3 */ \ |
|
.debug_ranges 0 : { *(.debug_ranges) } \ |
|
/* SGI/MIPS DWARF 2 extensions */ \ |
|
.debug_weaknames 0 : { *(.debug_weaknames) } \ |
|
.debug_funcnames 0 : { *(.debug_funcnames) } \ |
|
.debug_typenames 0 : { *(.debug_typenames) } \ |
|
.debug_varnames 0 : { *(.debug_varnames) } \ |
|
/* GNU DWARF 2 extensions */ \ |
|
.debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ |
|
.debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ |
|
/* DWARF 4 */ \ |
|
.debug_types 0 : { *(.debug_types) } \ |
|
/* DWARF 5 */ \ |
|
.debug_addr 0 : { *(.debug_addr) } \ |
|
.debug_line_str 0 : { *(.debug_line_str) } \ |
|
.debug_loclists 0 : { *(.debug_loclists) } \ |
|
.debug_macro 0 : { *(.debug_macro) } \ |
|
.debug_names 0 : { *(.debug_names) } \ |
|
.debug_rnglists 0 : { *(.debug_rnglists) } \ |
|
.debug_str_offsets 0 : { *(.debug_str_offsets) } |
|
|
|
/* Stabs debugging sections. */ |
|
#define STABS_DEBUG \ |
|
.stab 0 : { *(.stab) } \ |
|
.stabstr 0 : { *(.stabstr) } \ |
|
.stab.excl 0 : { *(.stab.excl) } \ |
|
.stab.exclstr 0 : { *(.stab.exclstr) } \ |
|
.stab.index 0 : { *(.stab.index) } \ |
|
.stab.indexstr 0 : { *(.stab.indexstr) } |
|
|
|
/* Required sections not related to debugging. */ |
|
#define ELF_DETAILS \ |
|
.comment 0 : { *(.comment) } \ |
|
.symtab 0 : { *(.symtab) } \ |
|
.strtab 0 : { *(.strtab) } \ |
|
.shstrtab 0 : { *(.shstrtab) } |
|
|
|
#ifdef CONFIG_GENERIC_BUG |
|
#define BUG_TABLE \ |
|
. = ALIGN(8); \ |
|
__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ |
|
__start___bug_table = .; \ |
|
KEEP(*(__bug_table)) \ |
|
__stop___bug_table = .; \ |
|
} |
|
#else |
|
#define BUG_TABLE |
|
#endif |
|
|
|
#ifdef CONFIG_UNWINDER_ORC |
|
#define ORC_UNWIND_TABLE \ |
|
. = ALIGN(4); \ |
|
.orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ |
|
__start_orc_unwind_ip = .; \ |
|
KEEP(*(.orc_unwind_ip)) \ |
|
__stop_orc_unwind_ip = .; \ |
|
} \ |
|
. = ALIGN(2); \ |
|
.orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ |
|
__start_orc_unwind = .; \ |
|
KEEP(*(.orc_unwind)) \ |
|
__stop_orc_unwind = .; \ |
|
} \ |
|
. = ALIGN(4); \ |
|
.orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ |
|
orc_lookup = .; \ |
|
. += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ |
|
LOOKUP_BLOCK_SIZE) + 1) * 4; \ |
|
orc_lookup_end = .; \ |
|
} |
|
#else |
|
#define ORC_UNWIND_TABLE |
|
#endif |
|
|
|
#ifdef CONFIG_PM_TRACE |
|
#define TRACEDATA \ |
|
. = ALIGN(4); \ |
|
.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ |
|
__tracedata_start = .; \ |
|
KEEP(*(.tracedata)) \ |
|
__tracedata_end = .; \ |
|
} |
|
#else |
|
#define TRACEDATA |
|
#endif |
|
|
|
#define NOTES \ |
|
.notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ |
|
__start_notes = .; \ |
|
KEEP(*(.note.*)) \ |
|
__stop_notes = .; \ |
|
} NOTES_HEADERS \ |
|
NOTES_HEADERS_RESTORE |
|
|
|
#define INIT_SETUP(initsetup_align) \ |
|
. = ALIGN(initsetup_align); \ |
|
__setup_start = .; \ |
|
KEEP(*(.init.setup)) \ |
|
__setup_end = .; |
|
|
|
#define INIT_CALLS_LEVEL(level) \ |
|
__initcall##level##_start = .; \ |
|
KEEP(*(.initcall##level##.init)) \ |
|
KEEP(*(.initcall##level##s.init)) \ |
|
|
|
#define INIT_CALLS \ |
|
__initcall_start = .; \ |
|
KEEP(*(.initcallearly.init)) \ |
|
INIT_CALLS_LEVEL(0) \ |
|
INIT_CALLS_LEVEL(1) \ |
|
INIT_CALLS_LEVEL(2) \ |
|
INIT_CALLS_LEVEL(3) \ |
|
INIT_CALLS_LEVEL(4) \ |
|
INIT_CALLS_LEVEL(5) \ |
|
INIT_CALLS_LEVEL(rootfs) \ |
|
INIT_CALLS_LEVEL(6) \ |
|
INIT_CALLS_LEVEL(7) \ |
|
__initcall_end = .; |
|
|
|
#define CON_INITCALL \ |
|
__con_initcall_start = .; \ |
|
KEEP(*(.con_initcall.init)) \ |
|
__con_initcall_end = .; |
|
|
|
/* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ |
|
#define KUNIT_TABLE() \ |
|
. = ALIGN(8); \ |
|
__kunit_suites_start = .; \ |
|
KEEP(*(.kunit_test_suites)) \ |
|
__kunit_suites_end = .; |
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD |
|
#define INIT_RAM_FS \ |
|
. = ALIGN(4); \ |
|
__initramfs_start = .; \ |
|
KEEP(*(.init.ramfs)) \ |
|
. = ALIGN(8); \ |
|
KEEP(*(.init.ramfs.info)) |
|
#else |
|
#define INIT_RAM_FS |
|
#endif |
|
|
|
/* |
|
* Memory encryption operates on a page basis. Since we need to clear |
|
* the memory encryption mask for this section, it needs to be aligned |
|
* on a page boundary and be a page-size multiple in length. |
|
* |
|
* Note: We use a separate section so that only this section gets |
|
* decrypted to avoid exposing more than we wish. |
|
*/ |
|
#ifdef CONFIG_AMD_MEM_ENCRYPT |
|
#define PERCPU_DECRYPTED_SECTION \ |
|
. = ALIGN(PAGE_SIZE); \ |
|
*(.data..percpu..decrypted) \ |
|
. = ALIGN(PAGE_SIZE); |
|
#else |
|
#define PERCPU_DECRYPTED_SECTION |
|
#endif |
|
|
|
|
|
/* |
|
* Default discarded sections. |
|
* |
|
* Some archs want to discard exit text/data at runtime rather than |
|
* link time due to cross-section references such as alt instructions, |
|
* bug table, eh_frame, etc. DISCARDS must be the last of output |
|
* section definitions so that such archs put those in earlier section |
|
* definitions. |
|
*/ |
|
#ifdef RUNTIME_DISCARD_EXIT |
|
#define EXIT_DISCARDS |
|
#else |
|
#define EXIT_DISCARDS \ |
|
EXIT_TEXT \ |
|
EXIT_DATA |
|
#endif |
|
|
|
/* |
|
* Clang's -fprofile-arcs, -fsanitize=kernel-address, and |
|
* -fsanitize=thread produce unwanted sections (.eh_frame |
|
* and .init_array.*), but CONFIG_CONSTRUCTORS wants to |
|
* keep any .init_array.* sections. |
|
* https://bugs.llvm.org/show_bug.cgi?id=46478 |
|
*/ |
|
#if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) |
|
# ifdef CONFIG_CONSTRUCTORS |
|
# define SANITIZER_DISCARDS \ |
|
*(.eh_frame) |
|
# else |
|
# define SANITIZER_DISCARDS \ |
|
*(.init_array) *(.init_array.*) \ |
|
*(.eh_frame) |
|
# endif |
|
#else |
|
# define SANITIZER_DISCARDS |
|
#endif |
|
|
|
#define COMMON_DISCARDS \ |
|
SANITIZER_DISCARDS \ |
|
*(.discard) \ |
|
*(.discard.*) \ |
|
*(.modinfo) \ |
|
/* ld.bfd warns about .gnu.version* even when not emitted */ \ |
|
*(.gnu.version*) \ |
|
|
|
#define DISCARDS \ |
|
/DISCARD/ : { \ |
|
EXIT_DISCARDS \ |
|
EXIT_CALL \ |
|
COMMON_DISCARDS \ |
|
} |
|
|
|
/** |
|
* PERCPU_INPUT - the percpu input sections |
|
* @cacheline: cacheline size |
|
* |
|
* The core percpu section names and core symbols which do not rely |
|
* directly upon load addresses. |
|
* |
|
* @cacheline is used to align subsections to avoid false cacheline |
|
* sharing between subsections for different purposes. |
|
*/ |
|
#define PERCPU_INPUT(cacheline) \ |
|
__per_cpu_start = .; \ |
|
*(.data..percpu..first) \ |
|
. = ALIGN(PAGE_SIZE); \ |
|
*(.data..percpu..page_aligned) \ |
|
. = ALIGN(cacheline); \ |
|
*(.data..percpu..read_mostly) \ |
|
. = ALIGN(cacheline); \ |
|
*(.data..percpu) \ |
|
*(.data..percpu..shared_aligned) \ |
|
PERCPU_DECRYPTED_SECTION \ |
|
__per_cpu_end = .; |
|
|
|
/** |
|
* PERCPU_VADDR - define output section for percpu area |
|
* @cacheline: cacheline size |
|
* @vaddr: explicit base address (optional) |
|
* @phdr: destination PHDR (optional) |
|
* |
|
* Macro which expands to output section for percpu area. |
|
* |
|
* @cacheline is used to align subsections to avoid false cacheline |
|
* sharing between subsections for different purposes. |
|
* |
|
* If @vaddr is not blank, it specifies explicit base address and all |
|
* percpu symbols will be offset from the given address. If blank, |
|
* @vaddr always equals @laddr + LOAD_OFFSET. |
|
* |
|
* @phdr defines the output PHDR to use if not blank. Be warned that |
|
* output PHDR is sticky. If @phdr is specified, the next output |
|
* section in the linker script will go there too. @phdr should have |
|
* a leading colon. |
|
* |
|
* Note that this macros defines __per_cpu_load as an absolute symbol. |
|
* If there is no need to put the percpu section at a predetermined |
|
* address, use PERCPU_SECTION. |
|
*/ |
|
#define PERCPU_VADDR(cacheline, vaddr, phdr) \ |
|
__per_cpu_load = .; \ |
|
.data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ |
|
PERCPU_INPUT(cacheline) \ |
|
} phdr \ |
|
. = __per_cpu_load + SIZEOF(.data..percpu); |
|
|
|
/** |
|
* PERCPU_SECTION - define output section for percpu area, simple version |
|
* @cacheline: cacheline size |
|
* |
|
* Align to PAGE_SIZE and outputs output section for percpu area. This |
|
* macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and |
|
* __per_cpu_start will be identical. |
|
* |
|
* This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) |
|
* except that __per_cpu_load is defined as a relative symbol against |
|
* .data..percpu which is required for relocatable x86_32 configuration. |
|
*/ |
|
#define PERCPU_SECTION(cacheline) \ |
|
. = ALIGN(PAGE_SIZE); \ |
|
.data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ |
|
__per_cpu_load = .; \ |
|
PERCPU_INPUT(cacheline) \ |
|
} |
|
|
|
|
|
/* |
|
* Definition of the high level *_SECTION macros |
|
* They will fit only a subset of the architectures |
|
*/ |
|
|
|
|
|
/* |
|
* Writeable data. |
|
* All sections are combined in a single .data section. |
|
* The sections following CONSTRUCTORS are arranged so their |
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* typical alignment matches. |
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* A cacheline is typical/always less than a PAGE_SIZE so |
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* the sections that has this restriction (or similar) |
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* is located before the ones requiring PAGE_SIZE alignment. |
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* NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which |
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* matches the requirement of PAGE_ALIGNED_DATA. |
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* |
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* use 0 as page_align if page_aligned data is not used */ |
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#define RW_DATA(cacheline, pagealigned, inittask) \ |
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. = ALIGN(PAGE_SIZE); \ |
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.data : AT(ADDR(.data) - LOAD_OFFSET) { \ |
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INIT_TASK_DATA(inittask) \ |
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NOSAVE_DATA \ |
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PAGE_ALIGNED_DATA(pagealigned) \ |
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CACHELINE_ALIGNED_DATA(cacheline) \ |
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READ_MOSTLY_DATA(cacheline) \ |
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DATA_DATA \ |
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CONSTRUCTORS \ |
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} \ |
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BUG_TABLE \ |
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#define INIT_TEXT_SECTION(inittext_align) \ |
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. = ALIGN(inittext_align); \ |
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.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ |
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_sinittext = .; \ |
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INIT_TEXT \ |
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_einittext = .; \ |
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} |
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#define INIT_DATA_SECTION(initsetup_align) \ |
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.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ |
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INIT_DATA \ |
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INIT_SETUP(initsetup_align) \ |
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INIT_CALLS \ |
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CON_INITCALL \ |
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INIT_RAM_FS \ |
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} |
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#define BSS_SECTION(sbss_align, bss_align, stop_align) \ |
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. = ALIGN(sbss_align); \ |
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__bss_start = .; \ |
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SBSS(sbss_align) \ |
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BSS(bss_align) \ |
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. = ALIGN(stop_align); \ |
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__bss_stop = .;
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