+/*
+ * 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(PAGE_SIZE)
+ * __init_end = .;
+ *
+ * _stext = .;
+ * TEXT_SECTION = 0
+ * _etext = .;
+ *
+ * _sdata = .;
+ * RO_DATA_SECTION(PAGE_SIZE)
+ * RW_DATA_SECTION(...)
+ * _edata = .;
+ *
+ * EXCEPTION_TABLE(...)
+ * NOTES
+ *
+ * BSS_SECTION(0, 0, 0)
+ * _end = .;
+ *
+ * STABS_DEBUG
+ * DWARF_DEBUG
+ *
+ * DISCARDS // must be the last
+ * }
+ *
+ * [__init_begin, __init_end] is the init section that may be freed after init
+ * [_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
#define MEM_DISCARD(sec) *(.mem##sec)
#endif
+#ifdef CONFIG_FTRACE_MCOUNT_RECORD
+#define MCOUNT_REC() . = ALIGN(8); \
+ VMLINUX_SYMBOL(__start_mcount_loc) = .; \
+ *(__mcount_loc) \
+ VMLINUX_SYMBOL(__stop_mcount_loc) = .;
+#else
+#define MCOUNT_REC()
+#endif
+
+#ifdef CONFIG_TRACE_BRANCH_PROFILING
+#define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
+ *(_ftrace_annotated_branch) \
+ VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
+#else
+#define LIKELY_PROFILE()
+#endif
+
+#ifdef CONFIG_PROFILE_ALL_BRANCHES
+#define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
+ *(_ftrace_branch) \
+ VMLINUX_SYMBOL(__stop_branch_profile) = .;
+#else
+#define BRANCH_PROFILE()
+#endif
+
+#ifdef CONFIG_EVENT_TRACING
+#define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .; \
+ *(_ftrace_events) \
+ VMLINUX_SYMBOL(__stop_ftrace_events) = .;
+#else
+#define FTRACE_EVENTS()
+#endif
+
+#ifdef CONFIG_TRACING
+#define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
+ *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
+ VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
+#else
+#define TRACE_PRINTKS()
+#endif
+
+#ifdef CONFIG_FTRACE_SYSCALLS
+#define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
+ *(__syscalls_metadata) \
+ VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
+#else
+#define TRACE_SYSCALLS()
+#endif
/* .data section */
#define DATA_DATA \
*(.data) \
- *(.data.init.refok) \
*(.ref.data) \
DEV_KEEP(init.data) \
DEV_KEEP(exit.data) \
. = ALIGN(8); \
VMLINUX_SYMBOL(__start___markers) = .; \
*(__markers) \
- VMLINUX_SYMBOL(__stop___markers) = .;
+ VMLINUX_SYMBOL(__stop___markers) = .; \
+ . = ALIGN(32); \
+ VMLINUX_SYMBOL(__start___tracepoints) = .; \
+ *(__tracepoints) \
+ VMLINUX_SYMBOL(__stop___tracepoints) = .; \
+ /* implement dynamic printk debug */ \
+ . = ALIGN(8); \
+ VMLINUX_SYMBOL(__start___verbose) = .; \
+ *(__verbose) \
+ VMLINUX_SYMBOL(__stop___verbose) = .; \
+ LIKELY_PROFILE() \
+ BRANCH_PROFILE() \
+ TRACE_PRINTKS() \
+ FTRACE_EVENTS() \
+ TRACE_SYSCALLS()
+
+/*
+ * Data section helpers
+ */
+#define NOSAVE_DATA \
+ . = ALIGN(PAGE_SIZE); \
+ VMLINUX_SYMBOL(__nosave_begin) = .; \
+ *(.data.nosave) \
+ . = ALIGN(PAGE_SIZE); \
+ VMLINUX_SYMBOL(__nosave_end) = .;
+
+#define PAGE_ALIGNED_DATA(page_align) \
+ . = ALIGN(page_align); \
+ *(.data.page_aligned)
-#define RO_DATA(align) \
+#define READ_MOSTLY_DATA(align) \
+ . = ALIGN(align); \
+ *(.data.read_mostly)
+
+#define CACHELINE_ALIGNED_DATA(align) \
+ . = ALIGN(align); \
+ *(.data.cacheline_aligned)
+
+#define INIT_TASK_DATA(align) \
+ . = ALIGN(align); \
+ *(.data.init_task)
+
+/*
+ * Read only Data
+ */
+#define RO_DATA_SECTION(align) \
. = ALIGN((align)); \
.rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start_rodata) = .; \
*(.rodata) *(.rodata.*) \
*(__vermagic) /* Kernel version magic */ \
*(__markers_strings) /* Markers: strings */ \
+ *(__tracepoints_strings)/* Tracepoints: strings */ \
} \
\
.rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
*(.pci_fixup_resume) \
VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
+ VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
+ *(.pci_fixup_resume_early) \
+ VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
+ VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
+ *(.pci_fixup_suspend) \
+ VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
+ } \
+ \
+ /* Built-in firmware blobs */ \
+ .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start_builtin_fw) = .; \
+ *(.builtin_fw) \
+ VMLINUX_SYMBOL(__end_builtin_fw) = .; \
} \
\
/* RapidIO route ops */ \
} \
. = ALIGN((align));
-/* RODATA provided for backward compatibility.
+/* RODATA & RO_DATA provided for backward compatibility.
* All archs are supposed to use RO_DATA() */
-#define RODATA RO_DATA(4096)
+#define RODATA RO_DATA_SECTION(4096)
+#define RO_DATA(align) RO_DATA_SECTION(align)
#define SECURITY_INIT \
.security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
* during second ld run in second ld pass when generating System.map */
#define TEXT_TEXT \
ALIGN_FUNCTION(); \
+ *(.text.hot) \
*(.text) \
*(.ref.text) \
- *(.text.init.refok) \
- *(.exit.text.refok) \
DEV_KEEP(init.text) \
DEV_KEEP(exit.text) \
CPU_KEEP(init.text) \
CPU_KEEP(exit.text) \
MEM_KEEP(init.text) \
- MEM_KEEP(exit.text)
+ MEM_KEEP(exit.text) \
+ *(.text.unlikely)
/* sched.text is aling to function alignment to secure we have same
*(.kprobes.text) \
VMLINUX_SYMBOL(__kprobes_text_end) = .;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+#define IRQENTRY_TEXT \
+ ALIGN_FUNCTION(); \
+ VMLINUX_SYMBOL(__irqentry_text_start) = .; \
+ *(.irqentry.text) \
+ VMLINUX_SYMBOL(__irqentry_text_end) = .;
+#else
+#define IRQENTRY_TEXT
+#endif
+
/* Section used for early init (in .S files) */
#define HEAD_TEXT *(.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) { \
+ VMLINUX_SYMBOL(__start___ex_table) = .; \
+ *(__ex_table) \
+ VMLINUX_SYMBOL(__stop___ex_table) = .; \
+ }
+
+/*
+ * Init task
+ */
+#define INIT_TASK_DATA_SECTION(align) \
+ . = ALIGN(align); \
+ .data.init_task : { \
+ INIT_TASK_DATA(align) \
+ }
+
+#ifdef CONFIG_CONSTRUCTORS
+#define KERNEL_CTORS() . = ALIGN(8); \
+ VMLINUX_SYMBOL(__ctors_start) = .; \
+ *(.ctors) \
+ VMLINUX_SYMBOL(__ctors_end) = .;
+#else
+#define KERNEL_CTORS()
+#endif
+
/* init and exit section handling */
#define INIT_DATA \
*(.init.data) \
DEV_DISCARD(init.data) \
- DEV_DISCARD(init.rodata) \
CPU_DISCARD(init.data) \
- CPU_DISCARD(init.rodata) \
MEM_DISCARD(init.data) \
+ KERNEL_CTORS() \
+ *(.init.rodata) \
+ MCOUNT_REC() \
+ DEV_DISCARD(init.rodata) \
+ CPU_DISCARD(init.rodata) \
MEM_DISCARD(init.rodata)
#define INIT_TEXT \
CPU_DISCARD(exit.text) \
MEM_DISCARD(exit.text)
- /* DWARF debug sections.
- Symbols in the DWARF debugging sections are relative to
- the beginning of the section so we begin them at 0. */
+#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) { \
+ *(.sbss) \
+ *(.scommon) \
+ }
+
+#define BSS(bss_align) \
+ . = ALIGN(bss_align); \
+ .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
+ *(.bss.page_aligned) \
+ *(.dynbss) \
+ *(.bss) \
+ *(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) } \
#define BUG_TABLE \
. = ALIGN(8); \
__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
- __start___bug_table = .; \
+ VMLINUX_SYMBOL(__start___bug_table) = .; \
*(__bug_table) \
- __stop___bug_table = .; \
+ VMLINUX_SYMBOL(__stop___bug_table) = .; \
}
#else
#define BUG_TABLE
#define TRACEDATA \
. = ALIGN(4); \
.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
- __tracedata_start = .; \
+ VMLINUX_SYMBOL(__tracedata_start) = .; \
*(.tracedata) \
- __tracedata_end = .; \
+ VMLINUX_SYMBOL(__tracedata_end) = .; \
}
#else
#define TRACEDATA
VMLINUX_SYMBOL(__stop_notes) = .; \
}
+#define INIT_SETUP(initsetup_align) \
+ . = ALIGN(initsetup_align); \
+ VMLINUX_SYMBOL(__setup_start) = .; \
+ *(.init.setup) \
+ VMLINUX_SYMBOL(__setup_end) = .;
+
#define INITCALLS \
+ *(.initcallearly.init) \
+ VMLINUX_SYMBOL(__early_initcall_end) = .; \
*(.initcall0.init) \
*(.initcall0s.init) \
*(.initcall1.init) \
*(.initcall7.init) \
*(.initcall7s.init)
+#define INIT_CALLS \
+ VMLINUX_SYMBOL(__initcall_start) = .; \
+ INITCALLS \
+ VMLINUX_SYMBOL(__initcall_end) = .;
+
+#define CON_INITCALL \
+ VMLINUX_SYMBOL(__con_initcall_start) = .; \
+ *(.con_initcall.init) \
+ VMLINUX_SYMBOL(__con_initcall_end) = .;
+
+#define SECURITY_INITCALL \
+ VMLINUX_SYMBOL(__security_initcall_start) = .; \
+ *(.security_initcall.init) \
+ VMLINUX_SYMBOL(__security_initcall_end) = .;
+
+#ifdef CONFIG_BLK_DEV_INITRD
+#define INIT_RAM_FS \
+ . = ALIGN(PAGE_SIZE); \
+ VMLINUX_SYMBOL(__initramfs_start) = .; \
+ *(.init.ramfs) \
+ VMLINUX_SYMBOL(__initramfs_end) = .;
+#else
+#define INIT_RAM_FS
+#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.
+ */
+#define DISCARDS \
+ /DISCARD/ : { \
+ EXIT_TEXT \
+ EXIT_DATA \
+ EXIT_CALL \
+ *(.discard) \
+ }
+
+/**
+ * PERCPU_VADDR - define output section for percpu area
+ * @vaddr: explicit base address (optional)
+ * @phdr: destination PHDR (optional)
+ *
+ * Macro which expands to output section for percpu area. 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().
+ */
+#define PERCPU_VADDR(vaddr, phdr) \
+ VMLINUX_SYMBOL(__per_cpu_load) = .; \
+ .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
+ - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__per_cpu_start) = .; \
+ *(.data.percpu.first) \
+ *(.data.percpu.page_aligned) \
+ *(.data.percpu) \
+ *(.data.percpu.shared_aligned) \
+ VMLINUX_SYMBOL(__per_cpu_end) = .; \
+ } phdr \
+ . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu);
+
+/**
+ * PERCPU - define output section for percpu area, simple version
+ * @align: required alignment
+ *
+ * Align to @align and outputs output section for percpu area. This
+ * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
+ * __per_cpu_start will be identical.
+ *
+ * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
+ * that __per_cpu_load is defined as a relative symbol against
+ * .data.percpu which is required for relocatable x86_32
+ * configuration.
+ */
#define PERCPU(align) \
. = ALIGN(align); \
- __per_cpu_start = .; \
- .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \
+ .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__per_cpu_load) = .; \
+ VMLINUX_SYMBOL(__per_cpu_start) = .; \
+ *(.data.percpu.first) \
+ *(.data.percpu.page_aligned) \
*(.data.percpu) \
*(.data.percpu.shared_aligned) \
- } \
- __per_cpu_end = .;
+ VMLINUX_SYMBOL(__per_cpu_end) = .; \
+ }
+
+
+/*
+ * 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 requirment of PAGE_ALIGNED_DATA.
+ *
+ * use 0 as page_align if page_aligned data is not used */
+#define RW_DATA_SECTION(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 \
+ }
+
+#define INIT_TEXT_SECTION(inittext_align) \
+ . = ALIGN(inittext_align); \
+ .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(_sinittext) = .; \
+ INIT_TEXT \
+ VMLINUX_SYMBOL(_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 \
+ SECURITY_INITCALL \
+ INIT_RAM_FS \
+ }
+
+#define BSS_SECTION(sbss_align, bss_align, stop_align) \
+ . = ALIGN(sbss_align); \
+ VMLINUX_SYMBOL(__bss_start) = .; \
+ SBSS(sbss_align) \
+ BSS(bss_align) \
+ . = ALIGN(stop_align); \
+ VMLINUX_SYMBOL(__bss_stop) = .;