mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 01:34:14 +08:00
d9dedc1385
The 64-bit vDSO image is in a special ".vdso" section for no reason I can determine. Furthermore, the location of the vdso_end symbol includes some wrongly-calculated padding space in the image, which is then (correctly) rounded to page size, resulting in an extra page of zeros in the image mapped in to user processes. This changes it to put the vdso.so image into normal initdata as we have always done for the 32-bit vDSO images. The extra padding is gone, so the user VMA is one page instead of two. The image that was already copied around at boot time is now in initdata, so we recover that wasted space after boot. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
255 lines
6.2 KiB
ArmAsm
255 lines
6.2 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/page.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;
|
|
_proxy_pda = 1;
|
|
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 */
|
|
note PT_NOTE FLAGS(4); /* R__ */
|
|
}
|
|
SECTIONS
|
|
{
|
|
. = __START_KERNEL;
|
|
phys_startup_64 = startup_64 - LOAD_OFFSET;
|
|
_text = .; /* Text and read-only data */
|
|
.text : AT(ADDR(.text) - LOAD_OFFSET) {
|
|
/* First the code that has to be first for bootstrapping */
|
|
*(.text.head)
|
|
_stext = .;
|
|
/* Then the rest */
|
|
TEXT_TEXT
|
|
SCHED_TEXT
|
|
LOCK_TEXT
|
|
KPROBES_TEXT
|
|
*(.fixup)
|
|
*(.gnu.warning)
|
|
_etext = .; /* End of text section */
|
|
} :text = 0x9090
|
|
|
|
. = ALIGN(16); /* Exception table */
|
|
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
|
|
__start___ex_table = .;
|
|
*(__ex_table)
|
|
__stop___ex_table = .;
|
|
}
|
|
|
|
NOTES :text :note
|
|
|
|
BUG_TABLE :text
|
|
|
|
RODATA
|
|
|
|
. = ALIGN(4);
|
|
.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {
|
|
__tracedata_start = .;
|
|
*(.tracedata)
|
|
__tracedata_end = .;
|
|
}
|
|
|
|
. = ALIGN(PAGE_SIZE); /* Align data segment to page size boundary */
|
|
/* Data */
|
|
.data : AT(ADDR(.data) - LOAD_OFFSET) {
|
|
DATA_DATA
|
|
CONSTRUCTORS
|
|
} :data
|
|
|
|
_edata = .; /* End of data section */
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
|
|
.data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
|
|
*(.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
|
|
|
|
. = ALIGN(THREAD_SIZE); /* init_task */
|
|
.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
|
|
*(.data.init_task)
|
|
}:data.init
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
|
|
*(.data.page_aligned)
|
|
}
|
|
|
|
/* might get freed after init */
|
|
. = ALIGN(PAGE_SIZE);
|
|
__smp_alt_begin = .;
|
|
__smp_locks = .;
|
|
.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
|
|
*(.smp_locks)
|
|
}
|
|
__smp_locks_end = .;
|
|
. = ALIGN(PAGE_SIZE);
|
|
__smp_alt_end = .;
|
|
|
|
. = ALIGN(PAGE_SIZE); /* Init code and data */
|
|
__init_begin = .;
|
|
.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 = .;
|
|
}
|
|
|
|
. = ALIGN(16);
|
|
__setup_start = .;
|
|
.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { *(.init.setup) }
|
|
__setup_end = .;
|
|
__initcall_start = .;
|
|
.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
|
|
INITCALLS
|
|
}
|
|
__initcall_end = .;
|
|
__con_initcall_start = .;
|
|
.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
|
|
*(.con_initcall.init)
|
|
}
|
|
__con_initcall_end = .;
|
|
__x86cpuvendor_start = .;
|
|
.x86cpuvendor.init : AT(ADDR(.x86cpuvendor.init) - LOAD_OFFSET) {
|
|
*(.x86cpuvendor.init)
|
|
}
|
|
__x86cpuvendor_end = .;
|
|
SECURITY_INIT
|
|
|
|
. = ALIGN(8);
|
|
.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
|
|
__parainstructions = .;
|
|
*(.parainstructions)
|
|
__parainstructions_end = .;
|
|
}
|
|
|
|
. = ALIGN(8);
|
|
__alt_instructions = .;
|
|
.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
|
|
*(.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);
|
|
__initramfs_start = .;
|
|
.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
|
|
__initramfs_end = .;
|
|
#endif
|
|
|
|
PERCPU(PAGE_SIZE)
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
__init_end = .;
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
__nosave_begin = .;
|
|
.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) { *(.data.nosave) }
|
|
. = ALIGN(PAGE_SIZE);
|
|
__nosave_end = .;
|
|
|
|
__bss_start = .; /* BSS */
|
|
.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
|
|
*(.bss.page_aligned)
|
|
*(.bss)
|
|
}
|
|
__bss_stop = .;
|
|
|
|
_end = . ;
|
|
|
|
/* Sections to be discarded */
|
|
/DISCARD/ : {
|
|
*(.exitcall.exit)
|
|
*(.eh_frame)
|
|
}
|
|
|
|
STABS_DEBUG
|
|
|
|
DWARF_DEBUG
|
|
}
|
|
|
|
/*
|
|
* Build-time check on the image size:
|
|
*/
|
|
ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
|
|
"kernel image bigger than KERNEL_IMAGE_SIZE")
|