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Edit File: vmlinux.lds.h

/* * Helper macros to support writing architecture specific * linker scripts. * * A minimal linker scripts has following content: * [This is a sample, architectures may have special requiriements] * * OUTPUT_FORMAT(...) * OUTPUT_ARCH(...) * ENTRY(...) * SECTIONS * { * . = START; * __init_begin = .; * HEAD_TEXT_SECTION * INIT_TEXT_SECTION(PAGE_SIZE) * INIT_DATA_SECTION(...) * PERCPU_SECTION(CACHELINE_SIZE) * __init_end = .; * * _stext = .; * TEXT_SECTION = 0 * _etext = .; * * _sdata = .; * RO_DATA(PAGE_SIZE) * RW_DATA(...) * _edata = .; * * EXCEPTION_TABLE(...) * * BSS_SECTION(0, 0, 0) * _end = .; * * STABS_DEBUG * DWARF_DEBUG * ELF_DETAILS * * DISCARDS // must be the last * } * * [__init_begin, __init_end] is the init section that may be freed after init * // __init_begin and __init_end should be page aligned, so that we can * // free the whole .init memory * [_stext, _etext] is the text section * [_sdata, _edata] is the data section * * Some of the included output section have their own set of constants. * Examples are: [__initramfs_start, __initramfs_end] for initramfs and * [__nosave_begin, __nosave_end] for the nosave data */ #ifndef LOAD_OFFSET #define LOAD_OFFSET 0 #endif /* * Only some architectures want to have the .notes segment visible in * a separate PT_NOTE ELF Program Header. When this happens, it needs * to be visible in both the kernel text's PT_LOAD and the PT_NOTE * Program Headers. In this case, though, the PT_LOAD needs to be made * the default again so that all the following sections don't also end * up in the PT_NOTE Program Header. */ #ifdef EMITS_PT_NOTE #define NOTES_HEADERS :text :note #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text #else #define NOTES_HEADERS #define NOTES_HEADERS_RESTORE #endif /* * Some architectures have non-executable read-only exception tables. * They can be added to the RO_DATA segment by specifying their desired * alignment. */ #ifdef RO_EXCEPTION_TABLE_ALIGN #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) #else #define RO_EXCEPTION_TABLE #endif /* Align . function alignment. */ #define ALIGN_FUNCTION() . = ALIGN(CONFIG_FUNCTION_ALIGNMENT) /* * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which * generates .data.identifier sections, which need to be pulled in with * .data. We don't want to pull in .data..other sections, which Linux * has defined. Same for text and bss. * * With LTO_CLANG, the linker also splits sections by default, so we need * these macros to combine the sections during the final link. * * RODATA_MAIN is not used because existing code already defines .rodata.x * sections to be brought in with rodata. */ #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG) #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L* #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral* #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* #else #define TEXT_MAIN .text #define DATA_MAIN .data #define SDATA_MAIN .sdata #define RODATA_MAIN .rodata #define BSS_MAIN .bss #define SBSS_MAIN .sbss #endif /* * GCC 4.5 and later have a 32 bytes section alignment for structures. * Except GCC 4.9, that feels the need to align on 64 bytes. */ #define STRUCT_ALIGNMENT 32 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) /* * The order of the sched class addresses are important, as they are * used to determine the order of the priority of each sched class in * relation to each other. */ #define SCHED_DATA \ STRUCT_ALIGN(); \ __begin_sched_classes = .; \ *(__idle_sched_class) \ *(__fair_sched_class) \ *(__rt_sched_class) \ *(__dl_sched_class) \ *(__stop_sched_class) \ __end_sched_classes = .; /* The actual configuration determine if the init/exit sections * are handled as text/data or they can be discarded (which * often happens at runtime) */ #ifdef CONFIG_HOTPLUG_CPU #define CPU_KEEP(sec) *(.cpu##sec) #define CPU_DISCARD(sec) #else #define CPU_KEEP(sec) #define CPU_DISCARD(sec) *(.cpu##sec) #endif #if defined(CONFIG_MEMORY_HOTPLUG) #define MEM_KEEP(sec) *(.mem##sec) #define MEM_DISCARD(sec) #else #define MEM_KEEP(sec) #define MEM_DISCARD(sec) *(.mem##sec) #endif #ifdef CONFIG_FTRACE_MCOUNT_RECORD /* * The ftrace call sites are logged to a section whose name depends on the * compiler option used. A given kernel image will only use one, AKA * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header * dependencies for FTRACE_CALLSITE_SECTION's definition. * * Need to also make ftrace_stub_graph point to ftrace_stub * so that the same stub location may have different protocols * and not mess up with C verifiers. */ #define MCOUNT_REC() . = ALIGN(8); \ __start_mcount_loc = .; \ KEEP(*(__mcount_loc)) \ KEEP(*(__patchable_function_entries)) \ __stop_mcount_loc = .; \ ftrace_stub_graph = ftrace_stub; #else # ifdef CONFIG_FUNCTION_TRACER # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; # else # define MCOUNT_REC() # endif #endif #ifdef CONFIG_TRACE_BRANCH_PROFILING #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ KEEP(*(_ftrace_annotated_branch)) \ __stop_annotated_branch_profile = .; #else #define LIKELY_PROFILE() #endif #ifdef CONFIG_PROFILE_ALL_BRANCHES #define BRANCH_PROFILE() __start_branch_profile = .; \ KEEP(*(_ftrace_branch)) \ __stop_branch_profile = .; #else #define BRANCH_PROFILE() #endif #ifdef CONFIG_KPROBES #define KPROBE_BLACKLIST() . = ALIGN(8); \ __start_kprobe_blacklist = .; \ KEEP(*(_kprobe_blacklist)) \ __stop_kprobe_blacklist = .; #else #define KPROBE_BLACKLIST() #endif #ifdef CONFIG_FUNCTION_ERROR_INJECTION #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ __start_error_injection_whitelist = .; \ KEEP(*(_error_injection_whitelist)) \ __stop_error_injection_whitelist = .; #else #define ERROR_INJECT_WHITELIST() #endif #ifdef CONFIG_EVENT_TRACING #define FTRACE_EVENTS() . = ALIGN(8); \ __start_ftrace_events = .; \ KEEP(*(_ftrace_events)) \ __stop_ftrace_events = .; \ __start_ftrace_eval_maps = .; \ KEEP(*(_ftrace_eval_map)) \ __stop_ftrace_eval_maps = .; #else #define FTRACE_EVENTS() #endif #ifdef CONFIG_TRACING #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ __stop___trace_bprintk_fmt = .; #define TRACEPOINT_STR() __start___tracepoint_str = .; \ KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ __stop___tracepoint_str = .; #else #define TRACE_PRINTKS() #define TRACEPOINT_STR() #endif #ifdef CONFIG_FTRACE_SYSCALLS #define TRACE_SYSCALLS() . = ALIGN(8); \ __start_syscalls_metadata = .; \ KEEP(*(__syscalls_metadata)) \ __stop_syscalls_metadata = .; #else #define TRACE_SYSCALLS() #endif #ifdef CONFIG_BPF_EVENTS #define BPF_RAW_TP() STRUCT_ALIGN(); \ __start__bpf_raw_tp = .; \ KEEP(*(__bpf_raw_tp_map)) \ __stop__bpf_raw_tp = .; #else #define BPF_RAW_TP() #endif #ifdef CONFIG_SERIAL_EARLYCON #define EARLYCON_TABLE() . = ALIGN(8); \ __earlycon_table = .; \ KEEP(*(__earlycon_table)) \ __earlycon_table_end = .; #else #define EARLYCON_TABLE() #endif #ifdef CONFIG_SECURITY #define LSM_TABLE() . = ALIGN(8); \ __start_lsm_info = .; \ KEEP(*(.lsm_info.init)) \ __end_lsm_info = .; #define EARLY_LSM_TABLE() . = ALIGN(8); \ __start_early_lsm_info = .; \ KEEP(*(.early_lsm_info.init)) \ __end_early_lsm_info = .; #else #define LSM_TABLE() #define EARLY_LSM_TABLE() #endif #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) #define _OF_TABLE_0(name) #define _OF_TABLE_1(name) \ . = ALIGN(8); \ __##name##_of_table = .; \ KEEP(*(__##name##_of_table)) \ KEEP(*(__##name##_of_table_end)) #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) #ifdef CONFIG_ACPI #define ACPI_PROBE_TABLE(name) \ . = ALIGN(8); \ __##name##_acpi_probe_table = .; \ KEEP(*(__##name##_acpi_probe_table)) \ __##name##_acpi_probe_table_end = .; #else #define ACPI_PROBE_TABLE(name) #endif #ifdef CONFIG_THERMAL #define THERMAL_TABLE(name) \ . = ALIGN(8); \ __##name##_thermal_table = .; \ KEEP(*(__##name##_thermal_table)) \ __##name##_thermal_table_end = .; #else #define THERMAL_TABLE(name) #endif #ifdef CONFIG_DTPM #define DTPM_TABLE() \ . = ALIGN(8); \ __dtpm_table = .; \ KEEP(*(__dtpm_table)) \ __dtpm_table_end = .; #else #define DTPM_TABLE() #endif #define KERNEL_DTB() \ STRUCT_ALIGN(); \ __dtb_start = .; \ KEEP(*(.dtb.init.rodata)) \ __dtb_end = .; /* * .data section */ #define DATA_DATA \ *(.xiptext) \ *(DATA_MAIN) \ *(.data..decrypted) \ *(.ref.data) \ *(.data..shared_aligned) /* percpu related */ \ MEM_KEEP(init.data*) \ MEM_KEEP(exit.data*) \ *(.data.unlikely) \ __start_once = .; \ *(.data.once) \ __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 \ . = 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 \ \ 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) \ 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 = .; /* * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI) * jump table entries. */ #ifdef CONFIG_CFI_CLANG #define TEXT_CFI_JT \ ALIGN_FUNCTION(); \ __cfi_jt_start = .; \ *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \ __cfi_jt_end = .; #else #define TEXT_CFI_JT #endif /* * 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) \ *(.text.asan.* .text.tsan.*) \ TEXT_CFI_JT \ 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 #ifdef CONFIG_PRINTK_INDEX #define PRINTK_INDEX \ .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ __start_printk_index = .; \ *(.printk_index) \ __stop_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. */ #define NOTES \ /DISCARD/ : { *(.note.GNU-stack) } \ .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) || \ defined(CONFIG_CFI_CLANG) # 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 * 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 = .;