+/*
+ * 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
-#ifndef VMLINUX_SYMBOL
-#define VMLINUX_SYMBOL(_sym_) _sym_
+#ifndef SYMBOL_PREFIX
+#define VMLINUX_SYMBOL(sym) sym
+#else
+#define PASTE2(x,y) x##y
+#define PASTE(x,y) PASTE2(x,y)
+#define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
#endif
/* Align . to a 8 byte boundary equals to maximum function alignment. */
#define ALIGN_FUNCTION() . = ALIGN(8)
+/*
+ * Align to a 32 byte boundary equal to the
+ * alignment gcc 4.5 uses for a struct
+ */
+#define STRUCT_ALIGN() . = ALIGN(32)
+
/* The actual configuration determine if the init/exit sections
* are handled as text/data or they can be discarded (which
* often happens at runtime)
#endif
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
-#define MCOUNT_REC() VMLINUX_SYMBOL(__start_mcount_loc) = .; \
+#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) \
CPU_KEEP(exit.data) \
MEM_KEEP(init.data) \
MEM_KEEP(exit.data) \
- . = ALIGN(8); \
- VMLINUX_SYMBOL(__start___markers) = .; \
- *(__markers) \
- VMLINUX_SYMBOL(__stop___markers) = .; \
+ . = ALIGN(32); \
VMLINUX_SYMBOL(__start___tracepoints) = .; \
*(__tracepoints) \
- VMLINUX_SYMBOL(__stop___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() \
+ \
+ STRUCT_ALIGN(); \
+ FTRACE_EVENTS() \
+ \
+ STRUCT_ALIGN(); \
+ 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 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)
-#define RO_DATA(align) \
+/*
+ * Read only Data
+ */
+#define RO_DATA_SECTION(align) \
. = ALIGN((align)); \
.rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__start_rodata) = .; \
} \
\
/* RapidIO route ops */ \
- .rio_route : AT(ADDR(.rio_route) - LOAD_OFFSET) { \
- VMLINUX_SYMBOL(__start_rio_route_ops) = .; \
- *(.rio_route_ops) \
- VMLINUX_SYMBOL(__end_rio_route_ops) = .; \
+ .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \
+ *(.rio_switch_ops) \
+ VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \
} \
\
TRACEDATA \
/* __*init sections */ \
__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
*(.ref.rodata) \
- MCOUNT_REC() \
DEV_KEEP(init.rodata) \
DEV_KEEP(exit.rodata) \
CPU_KEEP(init.rodata) \
} \
. = 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) { \
*(.text.hot) \
*(.text) \
*(.ref.text) \
- *(.text.init.refok) \
- *(.exit.text.refok) \
DEV_KEEP(init.text) \
DEV_KEEP(exit.text) \
CPU_KEEP(init.text) \
*(.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 : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
+ 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) \
- MEM_DISCARD(init.rodata) \
- /* implement dynamic printk debug */ \
- VMLINUX_SYMBOL(__start___verbose_strings) = .; \
- *(__verbose_strings) \
- VMLINUX_SYMBOL(__stop___verbose_strings) = .; \
- . = ALIGN(8); \
- VMLINUX_SYMBOL(__start___verbose) = .; \
- *(__verbose) \
- VMLINUX_SYMBOL(__stop___verbose) = .;
+ KERNEL_CTORS() \
+ *(.init.rodata) \
+ MCOUNT_REC() \
+ DEV_DISCARD(init.rodata) \
+ CPU_DISCARD(init.rodata) \
+ MEM_DISCARD(init.rodata)
#define INIT_TEXT \
*(.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) } \
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) = .; \
*(.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) \
+ *(.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) \
+ . = ALIGN(PAGE_SIZE); \
+ *(.data..percpu..page_aligned) \
+ *(.data..percpu..readmostly) \
+ *(.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); \
- VMLINUX_SYMBOL(__per_cpu_start) = .; \
- .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \
- *(.data.percpu.page_aligned) \
- *(.data.percpu) \
- *(.data.percpu.shared_aligned) \
- } \
- VMLINUX_SYMBOL(__per_cpu_end) = .;
+ .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__per_cpu_load) = .; \
+ VMLINUX_SYMBOL(__per_cpu_start) = .; \
+ *(.data..percpu..first) \
+ . = ALIGN(PAGE_SIZE); \
+ *(.data..percpu..page_aligned) \
+ *(.data..percpu..readmostly) \
+ *(.data..percpu) \
+ *(.data..percpu..shared_aligned) \
+ 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) = .;
Code Review / linux-2.6.git / blobdiff