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Diffstat (limited to 'include/asm-generic/vmlinux.lds.h')
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 1189 |
1 files changed, 1189 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h new file mode 100644 index 000000000..b2988aa12 --- /dev/null +++ b/include/asm-generic/vmlinux.lds.h @@ -0,0 +1,1189 @@ +/* + * Helper macros to support writing architecture specific + * linker scripts. + * + * A minimal linker scripts has following content: + * [This is a sample, architectures may have special requirements] + * + * 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 + */ + +#include <asm-generic/codetag.lds.h> + +#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) + +/* + * Support -ffunction-sections by matching .text and .text.*, + * but exclude '.text..*', .text.startup[.*], and .text.exit[.*]. + * + * .text.startup and .text.startup.* are matched later by INIT_TEXT, and + * .text.exit and .text.exit.* are matched later by EXIT_TEXT, so they must be + * explicitly excluded here. + * + * Other .text.* sections that are typically grouped separately, such as + * .text.unlikely or .text.hot, must be matched explicitly before using + * TEXT_MAIN. + * + * NOTE: builds *with* and *without* -ffunction-sections are both supported by + * this single macro. Even with -ffunction-sections, there may be some objects + * NOT compiled with the flag due to the use of a specific Makefile override + * like cflags-y or AUTOFDO_PROFILE_foo.o. So this single catchall rule is + * needed to support mixed object builds. + * + * One implication is that functions named startup(), exit(), split(), + * unlikely(), hot(), and unknown() are not allowed in the kernel due to the + * ambiguity of their section names with -ffunction-sections. For example, + * .text.startup could be __attribute__((constructor)) code in a *non* + * ffunction-sections object, which should be placed in .init.text; or it could + * be an actual function named startup() in an ffunction-sections object, which + * should be placed in .text. The build will detect and complain about any such + * ambiguously named functions. + */ +#define TEXT_MAIN \ + .text \ + .text.[_0-9A-Za-df-rt-z]* \ + .text.s[_0-9A-Za-su-z]* .text.s .text.s.* \ + .text.st[_0-9A-Zb-z]* .text.st .text.st.* \ + .text.sta[_0-9A-Za-qs-z]* .text.sta .text.sta.* \ + .text.star[_0-9A-Za-su-z]* .text.star .text.star.* \ + .text.start[_0-9A-Za-tv-z]* .text.start .text.start.* \ + .text.startu[_0-9A-Za-oq-z]* .text.startu .text.startu.* \ + .text.startup[_0-9A-Za-z]* \ + .text.e[_0-9A-Za-wy-z]* .text.e .text.e.* \ + .text.ex[_0-9A-Za-hj-z]* .text.ex .text.ex.* \ + .text.exi[_0-9A-Za-su-z]* .text.exi .text.exi.* \ + .text.exit[_0-9A-Za-z]* + +/* + * Support -fdata-sections by matching .data, .data.*, and others, + * but exclude '.data..*'. + */ +#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data.rel.* .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..L* .bss..compoundliteral* +#define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* + +/* + * 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(); \ + __sched_class_highest = .; \ + *(__stop_sched_class) \ + *(__dl_sched_class) \ + *(__rt_sched_class) \ + *(__fair_sched_class) \ + *(__ext_sched_class) \ + *(__idle_sched_class) \ + __sched_class_lowest = .; + +/* The actual configuration determine if the init/exit sections + * are handled as text/data or they can be discarded (which + * often happens at runtime) + */ + +#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE +#define KEEP_PATCHABLE KEEP(*(__patchable_function_entries)) +#define PATCHABLE_DISCARDS +#else +#define KEEP_PATCHABLE +#define PATCHABLE_DISCARDS *(__patchable_function_entries) +#endif + +#ifndef CONFIG_ARCH_SUPPORTS_CFI +/* + * Simply points to ftrace_stub, but with the proper protocol. + * Defined by the linker script in linux/vmlinux.lds.h + */ +#define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub; +#else +#define FTRACE_STUB_HACK +#endif + +#ifdef CONFIG_DYNAMIC_FTRACE +/* + * 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. + * + * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func + * as some archs will have a different prototype for that function + * but ftrace_ops_list_func() will have a single prototype. + */ +#define MCOUNT_REC() . = ALIGN(8); \ + __start_mcount_loc = .; \ + KEEP(*(__mcount_loc)) \ + KEEP_PATCHABLE \ + __stop_mcount_loc = .; \ + FTRACE_STUB_HACK \ + ftrace_ops_list_func = arch_ftrace_ops_list_func; +#else +# ifdef CONFIG_FUNCTION_TRACER +# define MCOUNT_REC() FTRACE_STUB_HACK \ + ftrace_ops_list_func = arch_ftrace_ops_list_func; +# else +# define MCOUNT_REC() +# endif +#endif + +#define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \ + _BEGIN_##_label_ = .; \ + KEEP(*(_sec_)) \ + _END_##_label_ = .; + +#define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \ + _label_##_BEGIN_ = .; \ + KEEP(*(_sec_)) \ + _label_##_END_ = .; + +#define BOUNDED_SECTION_BY(_sec_, _label_) \ + BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) + +#define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec) + +#define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ + _HDR_##_label_ = .; \ + KEEP(*(.gnu.linkonce.##_sec_)) \ + BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) + +#define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ + _label_##_HDR_ = .; \ + KEEP(*(.gnu.linkonce.##_sec_)) \ + BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) + +#define HEADERED_SECTION_BY(_sec_, _label_) \ + HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) + +#define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec) + +#ifdef CONFIG_TRACE_BRANCH_PROFILING +#define LIKELY_PROFILE() \ + BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile) +#else +#define LIKELY_PROFILE() +#endif + +#ifdef CONFIG_PROFILE_ALL_BRANCHES +#define BRANCH_PROFILE() \ + BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile) +#else +#define BRANCH_PROFILE() +#endif + +#ifdef CONFIG_KPROBES +#define KPROBE_BLACKLIST() \ + . = ALIGN(8); \ + BOUNDED_SECTION(_kprobe_blacklist) +#else +#define KPROBE_BLACKLIST() +#endif + +#ifdef CONFIG_FUNCTION_ERROR_INJECTION +#define ERROR_INJECT_WHITELIST() \ + STRUCT_ALIGN(); \ + BOUNDED_SECTION(_error_injection_whitelist) +#else +#define ERROR_INJECT_WHITELIST() +#endif + +#ifdef CONFIG_EVENT_TRACING +#define FTRACE_EVENTS() \ + . = ALIGN(8); \ + BOUNDED_SECTION(_ftrace_events) \ + BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps) +#else +#define FTRACE_EVENTS() +#endif + +#ifdef CONFIG_TRACING +#define TRACE_PRINTKS() BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt) +#define TRACEPOINT_STR() BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str) +#else +#define TRACE_PRINTKS() +#define TRACEPOINT_STR() +#endif + +#ifdef CONFIG_FTRACE_SYSCALLS +#define TRACE_SYSCALLS() \ + . = ALIGN(8); \ + BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata) +#else +#define TRACE_SYSCALLS() +#endif + +#ifdef CONFIG_BPF_EVENTS +#define BPF_RAW_TP() STRUCT_ALIGN(); \ + BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp) +#else +#define BPF_RAW_TP() +#endif + +#ifdef CONFIG_SERIAL_EARLYCON +#define EARLYCON_TABLE() \ + . = ALIGN(8); \ + BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end) +#else +#define EARLYCON_TABLE() +#endif + +#ifdef CONFIG_SECURITY +#define LSM_TABLE() \ + . = ALIGN(8); \ + BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end) + +#define EARLY_LSM_TABLE() \ + . = ALIGN(8); \ + BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end) +#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); \ + BOUNDED_SECTION_POST_LABEL(__##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); \ + BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table, \ + __##name##_thermal_table,, _end) +#else +#define THERMAL_TABLE(name) +#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 */ \ + *(.data..unlikely) \ + __start_once = .; \ + *(.data..once) \ + __end_once = .; \ + *(.data..do_once) \ + STRUCT_ALIGN(); \ + *(__tracepoints) \ + /* implement dynamic printk debug */ \ + . = ALIGN(8); \ + BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \ + BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \ + CODETAG_SECTIONS() \ + LIKELY_PROFILE() \ + BRANCH_PROFILE() \ + TRACE_PRINTKS() \ + BPF_RAW_TP() \ + TRACEPOINT_STR() \ + KUNIT_TABLE() + +/* + * Data section helpers + */ +#define NOSAVE_DATA \ + . = ALIGN(PAGE_SIZE); \ + __nosave_begin = .; \ + *(.data..nosave) \ + . = ALIGN(PAGE_SIZE); \ + __nosave_end = .; + +#define CACHE_HOT_DATA(align) \ + . = ALIGN(align); \ + *(SORT_BY_ALIGNMENT(.data..hot.*)) \ + . = ALIGN(align); + +#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_stack = .; \ + init_thread_union = .; \ + init_stack = .; \ + KEEP(*(.data..init_thread_info)) \ + . = __start_init_stack + THREAD_SIZE; \ + __end_init_stack = .; + +#define JUMP_TABLE_DATA \ + . = ALIGN(8); \ + BOUNDED_SECTION_BY(__jump_table, ___jump_table) + +#ifdef CONFIG_HAVE_STATIC_CALL_INLINE +#define STATIC_CALL_DATA \ + . = ALIGN(8); \ + BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \ + BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key) +#else +#define STATIC_CALL_DATA +#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 \ + . = 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 \ + __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \ + BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \ + } +#else +#define KCFI_TRAPS +#endif +#endif + +/* + * Read only Data + */ +#define RO_DATA(align) \ + . = ALIGN((align)); \ + .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ + __start_rodata = .; \ + *(.rodata) *(.rodata.*) *(.data.rel.ro*) \ + SCHED_DATA \ + RO_AFTER_INIT_DATA /* Read only after init */ \ + . = ALIGN(8); \ + BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \ + *(__tracepoints_strings)/* Tracepoints: strings */ \ + } \ + \ + .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 */ \ + __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ + __start___ksymtab = .; \ + KEEP(*(SORT(___ksymtab+*))) \ + __stop___ksymtab = .; \ + } \ + \ + /* Kernel symbol CRC table */ \ + __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ + __start___kcrctab = .; \ + KEEP(*(SORT(___kcrctab+*))) \ + __stop___kcrctab = .; \ + } \ + \ + /* Kernel symbol flags table */ \ + __kflagstab : AT(ADDR(__kflagstab) - LOAD_OFFSET) { \ + __start___kflagstab = .; \ + KEEP(*(SORT(___kflagstab+*))) \ + __stop___kflagstab = .; \ + } \ + \ + /* 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) \ + } \ + \ + /* 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 = .; + +#define TEXT_SPLIT \ + __split_text_start = .; \ + *(.text.split .text.split.[0-9a-zA-Z_]*) \ + __split_text_end = .; + +#define TEXT_UNLIKELY \ + __unlikely_text_start = .; \ + *(.text.unlikely .text.unlikely.*) \ + __unlikely_text_end = .; + +#define TEXT_HOT \ + __hot_text_start = .; \ + *(.text.hot .text.hot.*) \ + __hot_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 symbols with a fixed pattern (for example, + * .text.hot or .text.unlikely). Match those before TEXT_MAIN to ensure + * they get grouped together. + * + * Also placing .text.hot section at the beginning of a page, this + * would help the TLB performance. + */ +#define TEXT_TEXT \ + ALIGN_FUNCTION(); \ + *(.text.asan.* .text.tsan.*) \ + *(.text.unknown .text.unknown.*) \ + TEXT_SPLIT \ + TEXT_UNLIKELY \ + . = ALIGN(PAGE_SIZE); \ + TEXT_HOT \ + *(TEXT_MAIN .text.fixup) \ + NOINSTR_TEXT \ + *(.ref.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 \ + . = ALIGN(PAGE_SIZE); \ + .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ + BOUNDED_SECTION_BY(.BTF, _BTF) \ + } \ + . = ALIGN(PAGE_SIZE); \ + .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.*) \ + KERNEL_CTORS() \ + MCOUNT_REC() \ + *(.init.rodata .init.rodata.*) \ + FTRACE_EVENTS() \ + TRACE_SYSCALLS() \ + KPROBE_BLACKLIST() \ + ERROR_INJECT_WHITELIST() \ + 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 .text.startup.*) + +#define EXIT_DATA \ + *(.exit.data .exit.data.*) \ + *(.fini_array .fini_array.*) \ + *(.dtors .dtors.*) + +#define EXIT_TEXT \ + *(.exit.text) \ + *(.text.exit .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) } + +#ifdef CONFIG_KLP_BUILD +#define KLP_SYMID \ + .klp.symid 0 : { *(.klp.symid) } +#else +#define KLP_SYMID +#endif + +/* Required sections not related to debugging. */ +#define ELF_DETAILS \ + .comment 0 : { *(.comment) } \ + .symtab 0 : { *(.symtab) } \ + .strtab 0 : { *(.strtab) } \ + .shstrtab 0 : { *(.shstrtab) } \ + KLP_SYMID + +#define MODINFO \ + .modinfo : { *(.modinfo) . = ALIGN(8); } + +#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) + +#define NAMED_SECTION(name) \ + . = ALIGN(8); \ + name : AT(ADDR(name) - LOAD_OFFSET) \ + { BOUNDED_SECTION_PRE_LABEL(name, name, __start_, __stop_) } + +#define RUNTIME_CONST(t,x) NAMED_SECTION(runtime_##t##_##x) + +#define RUNTIME_CONST_VARIABLES \ + RUNTIME_CONST(shift, d_hash_shift) \ + RUNTIME_CONST(ptr, dentry_hashtable) \ + RUNTIME_CONST(ptr, __dentry_cache) \ + RUNTIME_CONST(ptr, __names_cache) \ + RUNTIME_CONST(ptr, __filp_cache) \ + RUNTIME_CONST(ptr, __bfilp_cache) \ + RUNTIME_CONST(shift, __futex_shift) \ + RUNTIME_CONST(mask, __futex_mask) \ + RUNTIME_CONST(ptr, __futex_queues) + +/* 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 + +#ifdef CONFIG_PROPELLER_CLANG +#define PROPELLER_DATA \ + .llvm_bb_addr_map : { *(.llvm_bb_addr_map) } +#else +#define PROPELLER_DATA +#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) \ + *(.no_trim_symbol) \ + /* ld.bfd warns about .gnu.version* even when not emitted */ \ + *(.gnu.version*) \ + *(__tracepoint_check) \ + +#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 = .; \ + . = ALIGN(PAGE_SIZE); \ + *(.data..percpu..page_aligned) \ + . = ALIGN(cacheline); \ + __per_cpu_hot_start = .; \ + *(SORT_BY_ALIGNMENT(.data..percpu..hot.*)) \ + __per_cpu_hot_end = .; \ + . = ALIGN(cacheline); \ + *(.data..percpu..read_mostly) \ + . = ALIGN(cacheline); \ + *(.data..percpu) \ + *(.data..percpu..shared_aligned) \ + PERCPU_DECRYPTED_SECTION \ + __per_cpu_end = .; + +/** + * PERCPU_SECTION - define output section for percpu area + * @cacheline: cacheline size + * + * 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. + */ +#define PERCPU_SECTION(cacheline) \ + . = ALIGN(PAGE_SIZE); \ + .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ + 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) \ + CACHE_HOT_DATA(cacheline) \ + 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 = .; |