1153 lines
33 KiB
C
1153 lines
33 KiB
C
/*
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* 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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#ifndef LOAD_OFFSET
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#define LOAD_OFFSET 0
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#endif
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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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* 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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/* Align . function alignment. */
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#define ALIGN_FUNCTION() . = ALIGN(CONFIG_FUNCTION_ALIGNMENT)
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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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* 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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#define STRUCT_ALIGNMENT 32
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#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
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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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__sched_class_highest = .; \
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*(__stop_sched_class) \
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*(__dl_sched_class) \
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*(__rt_sched_class) \
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*(__fair_sched_class) \
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*(__idle_sched_class) \
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__sched_class_lowest = .;
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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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#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
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#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
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#define KEEP_PATCHABLE KEEP(*(__patchable_function_entries))
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#define PATCHABLE_DISCARDS
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#else
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#define KEEP_PATCHABLE
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#define PATCHABLE_DISCARDS *(__patchable_function_entries)
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#endif
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#ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG
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/*
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* Simply points to ftrace_stub, but with the proper protocol.
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* Defined by the linker script in linux/vmlinux.lds.h
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*/
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#define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub;
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#else
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#define FTRACE_STUB_HACK
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#endif
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#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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* ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
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* as some archs will have a different prototype for that function
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* but ftrace_ops_list_func() will have a single prototype.
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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 \
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__stop_mcount_loc = .; \
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FTRACE_STUB_HACK \
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ftrace_ops_list_func = arch_ftrace_ops_list_func;
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#else
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# ifdef CONFIG_FUNCTION_TRACER
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# define MCOUNT_REC() FTRACE_STUB_HACK \
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ftrace_ops_list_func = arch_ftrace_ops_list_func;
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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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#define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \
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_BEGIN_##_label_ = .; \
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KEEP(*(_sec_)) \
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_END_##_label_ = .;
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#define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \
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_label_##_BEGIN_ = .; \
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KEEP(*(_sec_)) \
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_label_##_END_ = .;
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#define BOUNDED_SECTION_BY(_sec_, _label_) \
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BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
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#define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec)
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#define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
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_HDR_##_label_ = .; \
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KEEP(*(.gnu.linkonce.##_sec_)) \
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BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)
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#define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
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_label_##_HDR_ = .; \
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KEEP(*(.gnu.linkonce.##_sec_)) \
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BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)
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#define HEADERED_SECTION_BY(_sec_, _label_) \
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HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
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#define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec)
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#ifdef CONFIG_TRACE_BRANCH_PROFILING
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#define LIKELY_PROFILE() \
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BOUNDED_SECTION_BY(_ftrace_annotated_branch, _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() \
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BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile)
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#else
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#define BRANCH_PROFILE()
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#endif
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#ifdef CONFIG_KPROBES
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#define KPROBE_BLACKLIST() \
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. = ALIGN(8); \
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BOUNDED_SECTION(_kprobe_blacklist)
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#else
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#define KPROBE_BLACKLIST()
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#endif
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#ifdef CONFIG_FUNCTION_ERROR_INJECTION
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#define ERROR_INJECT_WHITELIST() \
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STRUCT_ALIGN(); \
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BOUNDED_SECTION(_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() \
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. = ALIGN(8); \
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BOUNDED_SECTION(_ftrace_events) \
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BOUNDED_SECTION_BY(_ftrace_eval_map, _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() BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt)
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#define TRACEPOINT_STR() BOUNDED_SECTION_BY(__tracepoint_str, ___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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#ifdef CONFIG_FTRACE_SYSCALLS
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#define TRACE_SYSCALLS() \
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. = ALIGN(8); \
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BOUNDED_SECTION_BY(__syscalls_metadata, _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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BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp)
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#else
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#define BPF_RAW_TP()
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#endif
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#ifdef CONFIG_SERIAL_EARLYCON
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#define EARLYCON_TABLE() \
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. = ALIGN(8); \
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BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end)
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#else
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#define EARLYCON_TABLE()
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#endif
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#ifdef CONFIG_SECURITY
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#define LSM_TABLE() \
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. = ALIGN(8); \
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BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end)
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#define EARLY_LSM_TABLE() \
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. = ALIGN(8); \
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BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end)
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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
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#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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#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)
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#ifdef CONFIG_ACPI
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#define ACPI_PROBE_TABLE(name) \
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. = ALIGN(8); \
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BOUNDED_SECTION_POST_LABEL(__##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
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#ifdef CONFIG_THERMAL
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#define THERMAL_TABLE(name) \
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. = ALIGN(8); \
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BOUNDED_SECTION_POST_LABEL(__##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
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#define KERNEL_DTB() \
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STRUCT_ALIGN(); \
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__dtb_start = .; \
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KEEP(*(.dtb.init.rodata)) \
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__dtb_end = .;
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/*
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* .data section
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*/
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#define DATA_DATA \
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*(.xiptext) \
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*(DATA_MAIN) \
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*(.data..decrypted) \
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*(.ref.data) \
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*(.data..shared_aligned) /* percpu related */ \
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MEM_KEEP(init.data*) \
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*(.data.unlikely) \
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__start_once = .; \
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*(.data.once) \
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__end_once = .; \
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STRUCT_ALIGN(); \
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*(__tracepoints) \
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/* implement dynamic printk debug */ \
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. = ALIGN(8); \
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BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \
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BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \
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LIKELY_PROFILE() \
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BRANCH_PROFILE() \
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TRACE_PRINTKS() \
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BPF_RAW_TP() \
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TRACEPOINT_STR() \
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KUNIT_TABLE()
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|
/*
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* Data section helpers
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*/
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#define NOSAVE_DATA \
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. = ALIGN(PAGE_SIZE); \
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__nosave_begin = .; \
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*(.data..nosave) \
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. = ALIGN(PAGE_SIZE); \
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__nosave_end = .;
|
|
|
|
#define PAGE_ALIGNED_DATA(page_align) \
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. = ALIGN(page_align); \
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|
*(.data..page_aligned) \
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. = ALIGN(page_align);
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|
|
|
#define READ_MOSTLY_DATA(align) \
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. = ALIGN(align); \
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*(.data..read_mostly) \
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. = ALIGN(align);
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|
|
|
#define CACHELINE_ALIGNED_DATA(align) \
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. = ALIGN(align); \
|
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*(.data..cacheline_aligned)
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|
|
|
#define INIT_TASK_DATA(align) \
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. = 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); \
|
|
BOUNDED_SECTION_BY(__jump_table, ___jump_table)
|
|
|
|
#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
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|
#define STATIC_CALL_DATA \
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|
. = ALIGN(8); \
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|
BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \
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|
BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key)
|
|
#else
|
|
#define STATIC_CALL_DATA
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|
#endif
|
|
|
|
/*
|
|
* 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 \
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|
. = ALIGN(8); \
|
|
__start_ro_after_init = .; \
|
|
*(.data..ro_after_init) \
|
|
JUMP_TABLE_DATA \
|
|
STATIC_CALL_DATA \
|
|
__end_ro_after_init = .;
|
|
#endif
|
|
|
|
/*
|
|
* .kcfi_traps contains a list KCFI trap locations.
|
|
*/
|
|
#ifndef KCFI_TRAPS
|
|
#ifdef CONFIG_ARCH_USES_CFI_TRAPS
|
|
#define KCFI_TRAPS \
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__kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \
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BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \
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|
}
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#else
|
|
#define KCFI_TRAPS
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|
#endif
|
|
#endif
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|
|
|
/*
|
|
* 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); \
|
|
BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \
|
|
*(__tracepoints_strings)/* Tracepoints: strings */ \
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|
} \
|
|
\
|
|
.rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
|
|
*(.rodata1) \
|
|
} \
|
|
\
|
|
/* PCI quirks */ \
|
|
.pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early, _pci_fixups_early, __start, __end) \
|
|
BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \
|
|
BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final, _pci_fixups_final, __start, __end) \
|
|
BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \
|
|
BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \
|
|
BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \
|
|
BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \
|
|
BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \
|
|
} \
|
|
\
|
|
FW_LOADER_BUILT_IN_DATA \
|
|
TRACEDATA \
|
|
\
|
|
PRINTK_INDEX \
|
|
\
|
|
/* 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) \
|
|
} \
|
|
\
|
|
/* Built-in module parameters. */ \
|
|
__param : AT(ADDR(__param) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_BY(__param, ___param) \
|
|
} \
|
|
\
|
|
/* Built-in module versions. */ \
|
|
__modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_BY(__modver, ___modver) \
|
|
} \
|
|
\
|
|
KCFI_TRAPS \
|
|
\
|
|
RO_EXCEPTION_TABLE \
|
|
NOTES \
|
|
BTF \
|
|
\
|
|
. = ALIGN((align)); \
|
|
__end_rodata = .;
|
|
|
|
|
|
/*
|
|
* Non-instrumentable text section
|
|
*/
|
|
#define NOINSTR_TEXT \
|
|
ALIGN_FUNCTION(); \
|
|
__noinstr_text_start = .; \
|
|
*(.noinstr.text) \
|
|
__cpuidle_text_start = .; \
|
|
*(.cpuidle.text) \
|
|
__cpuidle_text_end = .; \
|
|
__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 \
|
|
*(.ref.text) \
|
|
*(.text.asan.* .text.tsan.*) \
|
|
MEM_KEEP(init.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 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) { \
|
|
BOUNDED_SECTION_BY(__ex_table, ___ex_table) \
|
|
}
|
|
|
|
/*
|
|
* .BTF
|
|
*/
|
|
#ifdef CONFIG_DEBUG_INFO_BTF
|
|
#define BTF \
|
|
.BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_BY(.BTF, _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) \
|
|
EARLYCON_TABLE() \
|
|
LSM_TABLE() \
|
|
EARLY_LSM_TABLE() \
|
|
KUNIT_INIT_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.*) \
|
|
|
|
#define EXIT_TEXT \
|
|
*(.exit.text) \
|
|
*(.text.exit) \
|
|
|
|
#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) { \
|
|
BOUNDED_SECTION_BY(__bug_table, ___bug_table) \
|
|
}
|
|
#else
|
|
#define BUG_TABLE
|
|
#endif
|
|
|
|
#ifdef CONFIG_UNWINDER_ORC
|
|
#define ORC_UNWIND_TABLE \
|
|
.orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_BY(.orc_header, _orc_header) \
|
|
} \
|
|
. = ALIGN(4); \
|
|
.orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \
|
|
} \
|
|
. = ALIGN(2); \
|
|
.orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \
|
|
} \
|
|
text_size = _etext - _stext; \
|
|
. = ALIGN(4); \
|
|
.orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
|
|
orc_lookup = .; \
|
|
. += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \
|
|
LOOKUP_BLOCK_SIZE) + 1) * 4; \
|
|
orc_lookup_end = .; \
|
|
}
|
|
#else
|
|
#define ORC_UNWIND_TABLE
|
|
#endif
|
|
|
|
/* Built-in firmware blobs */
|
|
#ifdef CONFIG_FW_LOADER
|
|
#define FW_LOADER_BUILT_IN_DATA \
|
|
.builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \
|
|
BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \
|
|
}
|
|
#else
|
|
#define FW_LOADER_BUILT_IN_DATA
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM_TRACE
|
|
#define TRACEDATA \
|
|
. = ALIGN(4); \
|
|
.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \
|
|
}
|
|
#else
|
|
#define TRACEDATA
|
|
#endif
|
|
|
|
#ifdef CONFIG_PRINTK_INDEX
|
|
#define PRINTK_INDEX \
|
|
.printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_BY(.printk_index, _printk_index) \
|
|
}
|
|
#else
|
|
#define PRINTK_INDEX
|
|
#endif
|
|
|
|
/*
|
|
* Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler.
|
|
* Otherwise, the type of .notes section would become PROGBITS instead of NOTES.
|
|
*
|
|
* Also, discard .note.gnu.property, otherwise it forces the notes section to
|
|
* be 8-byte aligned which causes alignment mismatches with the kernel's custom
|
|
* 4-byte aligned notes.
|
|
*/
|
|
#define NOTES \
|
|
/DISCARD/ : { \
|
|
*(.note.GNU-stack) \
|
|
*(.note.gnu.property) \
|
|
} \
|
|
.notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
|
|
BOUNDED_SECTION_BY(.note.*, _notes) \
|
|
} NOTES_HEADERS \
|
|
NOTES_HEADERS_RESTORE
|
|
|
|
#define INIT_SETUP(initsetup_align) \
|
|
. = ALIGN(initsetup_align); \
|
|
BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _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 \
|
|
BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end)
|
|
|
|
/* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
|
|
#define KUNIT_TABLE() \
|
|
. = ALIGN(8); \
|
|
BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end)
|
|
|
|
/* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
|
|
#define KUNIT_INIT_TABLE() \
|
|
. = ALIGN(8); \
|
|
BOUNDED_SECTION_POST_LABEL(.kunit_init_test_suites, \
|
|
__kunit_init_suites, _start, _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://llvm.org/pr46478
|
|
*/
|
|
#ifdef CONFIG_UNWIND_TABLES
|
|
#define DISCARD_EH_FRAME
|
|
#else
|
|
#define DISCARD_EH_FRAME *(.eh_frame)
|
|
#endif
|
|
#if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
|
|
# ifdef CONFIG_CONSTRUCTORS
|
|
# define SANITIZER_DISCARDS \
|
|
DISCARD_EH_FRAME
|
|
# else
|
|
# define SANITIZER_DISCARDS \
|
|
*(.init_array) *(.init_array.*) \
|
|
DISCARD_EH_FRAME
|
|
# endif
|
|
#else
|
|
# define SANITIZER_DISCARDS
|
|
#endif
|
|
|
|
#define COMMON_DISCARDS \
|
|
SANITIZER_DISCARDS \
|
|
PATCHABLE_DISCARDS \
|
|
*(.discard) \
|
|
*(.discard.*) \
|
|
*(.export_symbol) \
|
|
*(.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
|
|
* typical alignment matches.
|
|
* A cacheline is typical/always less than a PAGE_SIZE so
|
|
* the sections that has this restriction (or similar)
|
|
* is located before the ones requiring PAGE_SIZE alignment.
|
|
* NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
|
|
* matches the requirement of PAGE_ALIGNED_DATA.
|
|
*
|
|
* use 0 as page_align if page_aligned data is not used */
|
|
#define RW_DATA(cacheline, pagealigned, inittask) \
|
|
. = ALIGN(PAGE_SIZE); \
|
|
.data : AT(ADDR(.data) - LOAD_OFFSET) { \
|
|
INIT_TASK_DATA(inittask) \
|
|
NOSAVE_DATA \
|
|
PAGE_ALIGNED_DATA(pagealigned) \
|
|
CACHELINE_ALIGNED_DATA(cacheline) \
|
|
READ_MOSTLY_DATA(cacheline) \
|
|
DATA_DATA \
|
|
CONSTRUCTORS \
|
|
} \
|
|
BUG_TABLE \
|
|
|
|
#define INIT_TEXT_SECTION(inittext_align) \
|
|
. = ALIGN(inittext_align); \
|
|
.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
|
|
_sinittext = .; \
|
|
INIT_TEXT \
|
|
_einittext = .; \
|
|
}
|
|
|
|
#define INIT_DATA_SECTION(initsetup_align) \
|
|
.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
|
|
INIT_DATA \
|
|
INIT_SETUP(initsetup_align) \
|
|
INIT_CALLS \
|
|
CON_INITCALL \
|
|
INIT_RAM_FS \
|
|
}
|
|
|
|
#define BSS_SECTION(sbss_align, bss_align, stop_align) \
|
|
. = ALIGN(sbss_align); \
|
|
__bss_start = .; \
|
|
SBSS(sbss_align) \
|
|
BSS(bss_align) \
|
|
. = ALIGN(stop_align); \
|
|
__bss_stop = .;
|