mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 19:01:37 +00:00
2965faa5e0
There are two kexec load syscalls, kexec_load another and kexec_file_load. kexec_file_load has been splited as kernel/kexec_file.c. In this patch I split kexec_load syscall code to kernel/kexec.c. And add a new kconfig option KEXEC_CORE, so we can disable kexec_load and use kexec_file_load only, or vice verse. The original requirement is from Ted Ts'o, he want kexec kernel signature being checked with CONFIG_KEXEC_VERIFY_SIG enabled. But kexec-tools use kexec_load syscall can bypass the checking. Vivek Goyal proposed to create a common kconfig option so user can compile in only one syscall for loading kexec kernel. KEXEC/KEXEC_FILE selects KEXEC_CORE so that old config files still work. Because there's general code need CONFIG_KEXEC_CORE, so I updated all the architecture Kconfig with a new option KEXEC_CORE, and let KEXEC selects KEXEC_CORE in arch Kconfig. Also updated general kernel code with to kexec_load syscall. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Dave Young <dyoung@redhat.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Petr Tesarik <ptesarik@suse.cz> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Josh Boyer <jwboyer@fedoraproject.org> Cc: David Howells <dhowells@redhat.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
374 lines
8.9 KiB
ArmAsm
374 lines
8.9 KiB
ArmAsm
/*
|
|
* ld script for the x86 kernel
|
|
*
|
|
* Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
|
|
*
|
|
* Modernisation, unification and other changes and fixes:
|
|
* Copyright (C) 2007-2009 Sam Ravnborg <sam@ravnborg.org>
|
|
*
|
|
*
|
|
* Don't define absolute symbols until and unless you know that symbol
|
|
* value is should remain constant even if kernel image is relocated
|
|
* at run time. Absolute symbols are not relocated. If symbol value should
|
|
* change if kernel is relocated, make the symbol section relative and
|
|
* put it inside the section definition.
|
|
*/
|
|
|
|
#ifdef CONFIG_X86_32
|
|
#define LOAD_OFFSET __PAGE_OFFSET
|
|
#else
|
|
#define LOAD_OFFSET __START_KERNEL_map
|
|
#endif
|
|
|
|
#include <asm-generic/vmlinux.lds.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/page_types.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/boot.h>
|
|
|
|
#undef i386 /* in case the preprocessor is a 32bit one */
|
|
|
|
OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)
|
|
|
|
#ifdef CONFIG_X86_32
|
|
OUTPUT_ARCH(i386)
|
|
ENTRY(phys_startup_32)
|
|
jiffies = jiffies_64;
|
|
#else
|
|
OUTPUT_ARCH(i386:x86-64)
|
|
ENTRY(phys_startup_64)
|
|
jiffies_64 = jiffies;
|
|
#endif
|
|
|
|
#if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA)
|
|
/*
|
|
* On 64-bit, align RODATA to 2MB so that even with CONFIG_DEBUG_RODATA
|
|
* we retain large page mappings for boundaries spanning kernel text, rodata
|
|
* and data sections.
|
|
*
|
|
* However, kernel identity mappings will have different RWX permissions
|
|
* to the pages mapping to text and to the pages padding (which are freed) the
|
|
* text section. Hence kernel identity mappings will be broken to smaller
|
|
* pages. For 64-bit, kernel text and kernel identity mappings are different,
|
|
* so we can enable protection checks that come with CONFIG_DEBUG_RODATA,
|
|
* as well as retain 2MB large page mappings for kernel text.
|
|
*/
|
|
#define X64_ALIGN_DEBUG_RODATA_BEGIN . = ALIGN(HPAGE_SIZE);
|
|
|
|
#define X64_ALIGN_DEBUG_RODATA_END \
|
|
. = ALIGN(HPAGE_SIZE); \
|
|
__end_rodata_hpage_align = .;
|
|
|
|
#else
|
|
|
|
#define X64_ALIGN_DEBUG_RODATA_BEGIN
|
|
#define X64_ALIGN_DEBUG_RODATA_END
|
|
|
|
#endif
|
|
|
|
PHDRS {
|
|
text PT_LOAD FLAGS(5); /* R_E */
|
|
data PT_LOAD FLAGS(6); /* RW_ */
|
|
#ifdef CONFIG_X86_64
|
|
#ifdef CONFIG_SMP
|
|
percpu PT_LOAD FLAGS(6); /* RW_ */
|
|
#endif
|
|
init PT_LOAD FLAGS(7); /* RWE */
|
|
#endif
|
|
note PT_NOTE FLAGS(0); /* ___ */
|
|
}
|
|
|
|
SECTIONS
|
|
{
|
|
#ifdef CONFIG_X86_32
|
|
. = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
|
|
phys_startup_32 = startup_32 - LOAD_OFFSET;
|
|
#else
|
|
. = __START_KERNEL;
|
|
phys_startup_64 = startup_64 - LOAD_OFFSET;
|
|
#endif
|
|
|
|
/* Text and read-only data */
|
|
.text : AT(ADDR(.text) - LOAD_OFFSET) {
|
|
_text = .;
|
|
/* bootstrapping code */
|
|
HEAD_TEXT
|
|
. = ALIGN(8);
|
|
_stext = .;
|
|
TEXT_TEXT
|
|
SCHED_TEXT
|
|
LOCK_TEXT
|
|
KPROBES_TEXT
|
|
ENTRY_TEXT
|
|
IRQENTRY_TEXT
|
|
*(.fixup)
|
|
*(.gnu.warning)
|
|
/* End of text section */
|
|
_etext = .;
|
|
} :text = 0x9090
|
|
|
|
NOTES :text :note
|
|
|
|
EXCEPTION_TABLE(16) :text = 0x9090
|
|
|
|
#if defined(CONFIG_DEBUG_RODATA)
|
|
/* .text should occupy whole number of pages */
|
|
. = ALIGN(PAGE_SIZE);
|
|
#endif
|
|
X64_ALIGN_DEBUG_RODATA_BEGIN
|
|
RO_DATA(PAGE_SIZE)
|
|
X64_ALIGN_DEBUG_RODATA_END
|
|
|
|
/* Data */
|
|
.data : AT(ADDR(.data) - LOAD_OFFSET) {
|
|
/* Start of data section */
|
|
_sdata = .;
|
|
|
|
/* init_task */
|
|
INIT_TASK_DATA(THREAD_SIZE)
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/* 32 bit has nosave before _edata */
|
|
NOSAVE_DATA
|
|
#endif
|
|
|
|
PAGE_ALIGNED_DATA(PAGE_SIZE)
|
|
|
|
CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
|
|
|
|
DATA_DATA
|
|
CONSTRUCTORS
|
|
|
|
/* rarely changed data like cpu maps */
|
|
READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES)
|
|
|
|
/* End of data section */
|
|
_edata = .;
|
|
} :data
|
|
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
__vvar_page = .;
|
|
|
|
.vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {
|
|
/* work around gold bug 13023 */
|
|
__vvar_beginning_hack = .;
|
|
|
|
/* Place all vvars at the offsets in asm/vvar.h. */
|
|
#define EMIT_VVAR(name, offset) \
|
|
. = __vvar_beginning_hack + offset; \
|
|
*(.vvar_ ## name)
|
|
#define __VVAR_KERNEL_LDS
|
|
#include <asm/vvar.h>
|
|
#undef __VVAR_KERNEL_LDS
|
|
#undef EMIT_VVAR
|
|
|
|
/*
|
|
* Pad the rest of the page with zeros. Otherwise the loader
|
|
* can leave garbage here.
|
|
*/
|
|
. = __vvar_beginning_hack + PAGE_SIZE;
|
|
} :data
|
|
|
|
. = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);
|
|
|
|
/* Init code and data - will be freed after init */
|
|
. = ALIGN(PAGE_SIZE);
|
|
.init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) {
|
|
__init_begin = .; /* paired with __init_end */
|
|
}
|
|
|
|
#if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
|
|
/*
|
|
* percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the
|
|
* output PHDR, so the next output section - .init.text - should
|
|
* start another segment - init.
|
|
*/
|
|
PERCPU_VADDR(INTERNODE_CACHE_BYTES, 0, :percpu)
|
|
ASSERT(SIZEOF(.data..percpu) < CONFIG_PHYSICAL_START,
|
|
"per-CPU data too large - increase CONFIG_PHYSICAL_START")
|
|
#endif
|
|
|
|
INIT_TEXT_SECTION(PAGE_SIZE)
|
|
#ifdef CONFIG_X86_64
|
|
:init
|
|
#endif
|
|
|
|
INIT_DATA_SECTION(16)
|
|
|
|
.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
|
|
__x86_cpu_dev_start = .;
|
|
*(.x86_cpu_dev.init)
|
|
__x86_cpu_dev_end = .;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_INTEL_MID
|
|
.x86_intel_mid_dev.init : AT(ADDR(.x86_intel_mid_dev.init) - \
|
|
LOAD_OFFSET) {
|
|
__x86_intel_mid_dev_start = .;
|
|
*(.x86_intel_mid_dev.init)
|
|
__x86_intel_mid_dev_end = .;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* start address and size of operations which during runtime
|
|
* can be patched with virtualization friendly instructions or
|
|
* baremetal native ones. Think page table operations.
|
|
* Details in paravirt_types.h
|
|
*/
|
|
. = ALIGN(8);
|
|
.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
|
|
__parainstructions = .;
|
|
*(.parainstructions)
|
|
__parainstructions_end = .;
|
|
}
|
|
|
|
/*
|
|
* struct alt_inst entries. From the header (alternative.h):
|
|
* "Alternative instructions for different CPU types or capabilities"
|
|
* Think locking instructions on spinlocks.
|
|
*/
|
|
. = ALIGN(8);
|
|
.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
|
|
__alt_instructions = .;
|
|
*(.altinstructions)
|
|
__alt_instructions_end = .;
|
|
}
|
|
|
|
/*
|
|
* And here are the replacement instructions. The linker sticks
|
|
* them as binary blobs. The .altinstructions has enough data to
|
|
* get the address and the length of them to patch the kernel safely.
|
|
*/
|
|
.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
|
|
*(.altinstr_replacement)
|
|
}
|
|
|
|
/*
|
|
* struct iommu_table_entry entries are injected in this section.
|
|
* It is an array of IOMMUs which during run time gets sorted depending
|
|
* on its dependency order. After rootfs_initcall is complete
|
|
* this section can be safely removed.
|
|
*/
|
|
.iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
|
|
__iommu_table = .;
|
|
*(.iommu_table)
|
|
__iommu_table_end = .;
|
|
}
|
|
|
|
. = ALIGN(8);
|
|
.apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {
|
|
__apicdrivers = .;
|
|
*(.apicdrivers);
|
|
__apicdrivers_end = .;
|
|
}
|
|
|
|
. = ALIGN(8);
|
|
/*
|
|
* .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
|
|
}
|
|
|
|
#if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP)
|
|
PERCPU_SECTION(INTERNODE_CACHE_BYTES)
|
|
#endif
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
|
|
/* freed after init ends here */
|
|
.init.end : AT(ADDR(.init.end) - LOAD_OFFSET) {
|
|
__init_end = .;
|
|
}
|
|
|
|
/*
|
|
* smp_locks might be freed after init
|
|
* start/end must be page aligned
|
|
*/
|
|
. = ALIGN(PAGE_SIZE);
|
|
.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
|
|
__smp_locks = .;
|
|
*(.smp_locks)
|
|
. = ALIGN(PAGE_SIZE);
|
|
__smp_locks_end = .;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
|
|
NOSAVE_DATA
|
|
}
|
|
#endif
|
|
|
|
/* BSS */
|
|
. = ALIGN(PAGE_SIZE);
|
|
.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
|
|
__bss_start = .;
|
|
*(.bss..page_aligned)
|
|
*(.bss)
|
|
. = ALIGN(PAGE_SIZE);
|
|
__bss_stop = .;
|
|
}
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
|
|
__brk_base = .;
|
|
. += 64 * 1024; /* 64k alignment slop space */
|
|
*(.brk_reservation) /* areas brk users have reserved */
|
|
__brk_limit = .;
|
|
}
|
|
|
|
_end = .;
|
|
|
|
STABS_DEBUG
|
|
DWARF_DEBUG
|
|
|
|
/* Sections to be discarded */
|
|
DISCARDS
|
|
/DISCARD/ : { *(.eh_frame) }
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
|
|
*/
|
|
. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
|
|
"kernel image bigger than KERNEL_IMAGE_SIZE");
|
|
#else
|
|
/*
|
|
* 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 = 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((irq_stack_union == 0),
|
|
"irq_stack_union is not at start of per-cpu area");
|
|
#endif
|
|
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
#include <asm/kexec.h>
|
|
|
|
. = ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
|
|
"kexec control code size is too big");
|
|
#endif
|
|
|