mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-14 14:34:28 +08:00
704439ddf9
Impact: disambiguate real .bss variables from .brk storage Add a .brk section after the .bss section. This has no effect on the final vmlinux, but it more clearly distinguishes the space taken by actual .bss symbols, and the variable space reserved by .brk users. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
299 lines
7.4 KiB
ArmAsm
299 lines
7.4 KiB
ArmAsm
/* ld script to make x86-64 Linux kernel
|
|
* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>;
|
|
*/
|
|
|
|
#define LOAD_OFFSET __START_KERNEL_map
|
|
|
|
#include <asm-generic/vmlinux.lds.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/page_types.h>
|
|
|
|
#undef i386 /* in case the preprocessor is a 32bit one */
|
|
|
|
OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
|
|
OUTPUT_ARCH(i386:x86-64)
|
|
ENTRY(phys_startup_64)
|
|
jiffies_64 = jiffies;
|
|
PHDRS {
|
|
text PT_LOAD FLAGS(5); /* R_E */
|
|
data PT_LOAD FLAGS(7); /* RWE */
|
|
user PT_LOAD FLAGS(7); /* RWE */
|
|
data.init PT_LOAD FLAGS(7); /* RWE */
|
|
#ifdef CONFIG_SMP
|
|
percpu PT_LOAD FLAGS(7); /* RWE */
|
|
#endif
|
|
data.init2 PT_LOAD FLAGS(7); /* RWE */
|
|
note PT_NOTE FLAGS(0); /* ___ */
|
|
}
|
|
SECTIONS
|
|
{
|
|
. = __START_KERNEL;
|
|
phys_startup_64 = startup_64 - LOAD_OFFSET;
|
|
.text : AT(ADDR(.text) - LOAD_OFFSET) {
|
|
_text = .; /* Text and read-only data */
|
|
/* First the code that has to be first for bootstrapping */
|
|
*(.text.head)
|
|
_stext = .;
|
|
/* Then the rest */
|
|
TEXT_TEXT
|
|
SCHED_TEXT
|
|
LOCK_TEXT
|
|
KPROBES_TEXT
|
|
IRQENTRY_TEXT
|
|
*(.fixup)
|
|
*(.gnu.warning)
|
|
_etext = .; /* End of text section */
|
|
} :text = 0x9090
|
|
|
|
NOTES :text :note
|
|
|
|
. = ALIGN(16); /* Exception table */
|
|
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
|
|
__start___ex_table = .;
|
|
*(__ex_table)
|
|
__stop___ex_table = .;
|
|
} :text = 0x9090
|
|
|
|
RODATA
|
|
|
|
. = ALIGN(PAGE_SIZE); /* Align data segment to page size boundary */
|
|
/* Data */
|
|
.data : AT(ADDR(.data) - LOAD_OFFSET) {
|
|
DATA_DATA
|
|
CONSTRUCTORS
|
|
_edata = .; /* End of data section */
|
|
} :data
|
|
|
|
|
|
.data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
|
|
. = ALIGN(PAGE_SIZE);
|
|
. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
|
|
*(.data.cacheline_aligned)
|
|
}
|
|
. = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
|
|
.data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
|
|
*(.data.read_mostly)
|
|
}
|
|
|
|
#define VSYSCALL_ADDR (-10*1024*1024)
|
|
#define VSYSCALL_PHYS_ADDR ((LOADADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
|
|
#define VSYSCALL_VIRT_ADDR ((ADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
|
|
|
|
#define VLOAD_OFFSET (VSYSCALL_ADDR - VSYSCALL_PHYS_ADDR)
|
|
#define VLOAD(x) (ADDR(x) - VLOAD_OFFSET)
|
|
|
|
#define VVIRT_OFFSET (VSYSCALL_ADDR - VSYSCALL_VIRT_ADDR)
|
|
#define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)
|
|
|
|
. = VSYSCALL_ADDR;
|
|
.vsyscall_0 : AT(VSYSCALL_PHYS_ADDR) { *(.vsyscall_0) } :user
|
|
__vsyscall_0 = VSYSCALL_VIRT_ADDR;
|
|
|
|
. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
|
|
.vsyscall_fn : AT(VLOAD(.vsyscall_fn)) { *(.vsyscall_fn) }
|
|
. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
|
|
.vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data))
|
|
{ *(.vsyscall_gtod_data) }
|
|
vsyscall_gtod_data = VVIRT(.vsyscall_gtod_data);
|
|
.vsyscall_clock : AT(VLOAD(.vsyscall_clock))
|
|
{ *(.vsyscall_clock) }
|
|
vsyscall_clock = VVIRT(.vsyscall_clock);
|
|
|
|
|
|
.vsyscall_1 ADDR(.vsyscall_0) + 1024: AT(VLOAD(.vsyscall_1))
|
|
{ *(.vsyscall_1) }
|
|
.vsyscall_2 ADDR(.vsyscall_0) + 2048: AT(VLOAD(.vsyscall_2))
|
|
{ *(.vsyscall_2) }
|
|
|
|
.vgetcpu_mode : AT(VLOAD(.vgetcpu_mode)) { *(.vgetcpu_mode) }
|
|
vgetcpu_mode = VVIRT(.vgetcpu_mode);
|
|
|
|
. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
|
|
.jiffies : AT(VLOAD(.jiffies)) { *(.jiffies) }
|
|
jiffies = VVIRT(.jiffies);
|
|
|
|
.vsyscall_3 ADDR(.vsyscall_0) + 3072: AT(VLOAD(.vsyscall_3))
|
|
{ *(.vsyscall_3) }
|
|
|
|
. = VSYSCALL_VIRT_ADDR + PAGE_SIZE;
|
|
|
|
#undef VSYSCALL_ADDR
|
|
#undef VSYSCALL_PHYS_ADDR
|
|
#undef VSYSCALL_VIRT_ADDR
|
|
#undef VLOAD_OFFSET
|
|
#undef VLOAD
|
|
#undef VVIRT_OFFSET
|
|
#undef VVIRT
|
|
|
|
.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
|
|
. = ALIGN(THREAD_SIZE); /* init_task */
|
|
*(.data.init_task)
|
|
}:data.init
|
|
|
|
.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
|
|
. = ALIGN(PAGE_SIZE);
|
|
*(.data.page_aligned)
|
|
}
|
|
|
|
.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
|
|
/* might get freed after init */
|
|
. = ALIGN(PAGE_SIZE);
|
|
__smp_alt_begin = .;
|
|
__smp_locks = .;
|
|
*(.smp_locks)
|
|
__smp_locks_end = .;
|
|
. = ALIGN(PAGE_SIZE);
|
|
__smp_alt_end = .;
|
|
}
|
|
|
|
. = ALIGN(PAGE_SIZE); /* Init code and data */
|
|
__init_begin = .; /* paired with __init_end */
|
|
.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
|
|
_sinittext = .;
|
|
INIT_TEXT
|
|
_einittext = .;
|
|
}
|
|
.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
|
|
__initdata_begin = .;
|
|
INIT_DATA
|
|
__initdata_end = .;
|
|
}
|
|
|
|
.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
|
|
. = ALIGN(16);
|
|
__setup_start = .;
|
|
*(.init.setup)
|
|
__setup_end = .;
|
|
}
|
|
.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
|
|
__initcall_start = .;
|
|
INITCALLS
|
|
__initcall_end = .;
|
|
}
|
|
.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
|
|
__con_initcall_start = .;
|
|
*(.con_initcall.init)
|
|
__con_initcall_end = .;
|
|
}
|
|
.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
|
|
__x86_cpu_dev_start = .;
|
|
*(.x86_cpu_dev.init)
|
|
__x86_cpu_dev_end = .;
|
|
}
|
|
SECURITY_INIT
|
|
|
|
. = ALIGN(8);
|
|
.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
|
|
__parainstructions = .;
|
|
*(.parainstructions)
|
|
__parainstructions_end = .;
|
|
}
|
|
|
|
.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
|
|
. = ALIGN(8);
|
|
__alt_instructions = .;
|
|
*(.altinstructions)
|
|
__alt_instructions_end = .;
|
|
}
|
|
.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
|
|
*(.altinstr_replacement)
|
|
}
|
|
/* .exit.text is discard at runtime, not link time, to deal with references
|
|
from .altinstructions and .eh_frame */
|
|
.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
|
|
EXIT_TEXT
|
|
}
|
|
.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
|
|
EXIT_DATA
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
. = ALIGN(PAGE_SIZE);
|
|
.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
|
|
__initramfs_start = .;
|
|
*(.init.ramfs)
|
|
__initramfs_end = .;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the
|
|
* output PHDR, so the next output section - __data_nosave - should
|
|
* start another section data.init2. Also, pda should be at the head of
|
|
* percpu area. Preallocate it and define the percpu offset symbol
|
|
* so that it can be accessed as a percpu variable.
|
|
*/
|
|
. = ALIGN(PAGE_SIZE);
|
|
PERCPU_VADDR(0, :percpu)
|
|
#else
|
|
PERCPU(PAGE_SIZE)
|
|
#endif
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
__init_end = .;
|
|
|
|
.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
|
|
. = ALIGN(PAGE_SIZE);
|
|
__nosave_begin = .;
|
|
*(.data.nosave)
|
|
. = ALIGN(PAGE_SIZE);
|
|
__nosave_end = .;
|
|
} :data.init2 /* use another section data.init2, see PERCPU_VADDR() above */
|
|
|
|
.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
|
|
. = ALIGN(PAGE_SIZE);
|
|
__bss_start = .; /* BSS */
|
|
*(.bss.page_aligned)
|
|
*(.bss)
|
|
__bss_stop = .;
|
|
}
|
|
|
|
.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
|
|
. = ALIGN(PAGE_SIZE);
|
|
__brk_base = . ;
|
|
. += 64 * 1024 ; /* 64k alignment slop space */
|
|
*(.brk_reservation) /* areas brk users have reserved */
|
|
__brk_limit = . ;
|
|
}
|
|
|
|
_end = . ;
|
|
|
|
/* Sections to be discarded */
|
|
/DISCARD/ : {
|
|
*(.exitcall.exit)
|
|
*(.eh_frame)
|
|
*(.discard)
|
|
}
|
|
|
|
STABS_DEBUG
|
|
|
|
DWARF_DEBUG
|
|
}
|
|
|
|
/*
|
|
* Per-cpu symbols which need to be offset from __per_cpu_load
|
|
* for the boot processor.
|
|
*/
|
|
#define INIT_PER_CPU(x) init_per_cpu__##x = per_cpu__##x + __per_cpu_load
|
|
INIT_PER_CPU(gdt_page);
|
|
INIT_PER_CPU(irq_stack_union);
|
|
|
|
/*
|
|
* Build-time check on the image size:
|
|
*/
|
|
ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
|
|
"kernel image bigger than KERNEL_IMAGE_SIZE")
|
|
|
|
#ifdef CONFIG_SMP
|
|
ASSERT((per_cpu__irq_stack_union == 0),
|
|
"irq_stack_union is not at start of per-cpu area");
|
|
#endif
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
#include <asm/kexec.h>
|
|
|
|
ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
|
|
"kexec control code size is too big")
|
|
#endif
|