/* SPDX-License-Identifier: GPL-2.0 */
/*
* ld script to make ARM Linux kernel
* taken from the i386 version by Russell King
* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
*/
#include <asm/hyp_image.h>
#ifdef CONFIG_KVM
#define HYPERVISOR_EXTABLE \
. =
ALIGN(SZ_8); \
__start___kvm_ex_table = .; \
*(__kvm_ex_table) \
__stop___kvm_ex_table = .;
#define HYPERVISOR_RODATA_SECTIONS \
HYP_SECTION_NAME(.rodata) : { \
. =
ALIGN(PAGE_SIZE); \
__hyp_rodata_start = .; \
*(HYP_SECTION_NAME(.
data..ro_after_init)) \
*(HYP_SECTION_NAME(.rodata)) \
. =
ALIGN(PAGE_SIZE); \
__hyp_rodata_end = .; \
}
#define HYPERVISOR_DATA_SECTION \
HYP_SECTION_NAME(.
data) : { \
. =
ALIGN(PAGE_SIZE); \
__hyp_data_start = .; \
*(HYP_SECTION_NAME(.
data)) \
. =
ALIGN(PAGE_SIZE); \
__hyp_data_end = .; \
}
#define HYPERVISOR_PERCPU_SECTION \
. =
ALIGN(PAGE_SIZE); \
HYP_SECTION_NAME(.
data..percpu) : { \
*(HYP_SECTION_NAME(.
data..percpu)) \
}
#define HYPERVISOR_RELOC_SECTION \
.hyp.reloc :
ALIGN(4) { \
__hyp_reloc_begin = .; \
*(.hyp.reloc) \
__hyp_reloc_end = .; \
}
#define BSS_FIRST_SECTIONS \
__hyp_bss_start = .; \
*(HYP_SECTION_NAME(.bss)) \
. =
ALIGN(PAGE_SIZE); \
__hyp_bss_end = .;
/*
* We require that __hyp_bss_start and __bss_start are aligned, and enforce it
* with an assertion. But the BSS_SECTION macro places an empty .sbss section
* between them, which can in some cases cause the linker to misalign them. To
* work around the issue, force a page alignment for __bss_start.
*/
#define SBSS_ALIGN PAGE_SIZE
#else
/* CONFIG_KVM */
#define HYPERVISOR_EXTABLE
#define HYPERVISOR_RODATA_SECTIONS
#define HYPERVISOR_DATA_SECTION
#define HYPERVISOR_PERCPU_SECTION
#define HYPERVISOR_RELOC_SECTION
#define SBSS_ALIGN 0
#endif
#define RO_EXCEPTION_TABLE_ALIGN 4
#define RUNTIME_DISCARD_EXIT
#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/kernel-pgtable.h>
#include <asm/kexec.h>
#include <asm/memory.h>
#include <asm/page.h>
#include
"image.h"
OUTPUT_ARCH(aarch64)
ENTRY(_text)
jiffies = jiffies_64;
#define HYPERVISOR_TEXT \
. =
ALIGN(PAGE_SIZE); \
__hyp_idmap_text_start = .; \
*(.hyp.idmap.text) \
__hyp_idmap_text_end = .; \
__hyp_text_start = .; \
*(.hyp.text) \
HYPERVISOR_EXTABLE \
. =
ALIGN(PAGE_SIZE); \
__hyp_text_end = .;
#define IDMAP_TEXT \
. =
ALIGN(SZ_4K); \
__idmap_text_start = .; \
*(.idmap.text) \
__idmap_text_end = .;
#ifdef CONFIG_HIBERNATION
#define HIBERNATE_TEXT \
ALIGN_FUNCTION(); \
__hibernate_exit_text_start = .; \
*(.hibernate_exit.text) \
__hibernate_exit_text_end = .;
#else
#define HIBERNATE_TEXT
#endif
#ifdef CONFIG_KEXEC_CORE
#define KEXEC_TEXT \
ALIGN_FUNCTION(); \
__relocate_new_kernel_start = .; \
*(.kexec_relocate.text) \
__relocate_new_kernel_end = .;
#else
#define KEXEC_TEXT
#endif
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
#define TRAMP_TEXT \
. =
ALIGN(PAGE_SIZE); \
__entry_tramp_text_start = .; \
*(.entry.tramp.text) \
. =
ALIGN(PAGE_SIZE); \
__entry_tramp_text_end = .; \
*(.entry.tramp.rodata)
#else
#define TRAMP_TEXT
#endif
#ifdef CONFIG_UNWIND_TABLES
#define UNWIND_DATA_SECTIONS \
.eh_frame : { \
__pi___eh_frame_start = .; \
*(.eh_frame) \
__pi___eh_frame_end = .; \
}
#else
#define UNWIND_DATA_SECTIONS
#endif
/*
* The size of the PE/COFF section that covers the kernel image, which
* runs from _stext to _edata, must be a round multiple of the PE/COFF
* FileAlignment, which we set to its minimum value of 0x200. '_stext'
* itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
* boundary should be sufficient.
*/
PECOFF_FILE_ALIGNMENT = 0x200;
#ifdef CONFIG_EFI
#define PECOFF_EDATA_PADDING \
.pecoff_edata_padding : { BYTE(0); . =
ALIGN(PECOFF_FILE_ALIGNMENT); }
#else
#define PECOFF_EDATA_PADDING
#endif
SECTIONS
{
/*
* XXX: The linker does not define how output sections are
* assigned to input sections when there are multiple statements
* matching the same input section name. There is no documented
* order of matching.
*/
DISCARDS
/DISCARD/ : {
*(.interp .dynamic)
*(.dynsym .dynstr .hash .gnu.hash)
*(.ARM.attributes)
}
. = KIMAGE_VADDR;
.head.text : {
_text = .;
HEAD_TEXT
}
.text :
ALIGN(SEGMENT_ALIGN) {
/* Real text segment */
_stext = .;
/* Text and read-only data */
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT
ENTRY_TEXT
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
KPROBES_TEXT
HYPERVISOR_TEXT
*(.gnu.warning)
}
. =
ALIGN(SEGMENT_ALIGN);
_etext = .;
/* End of text section */
/* everything from this point to __init_begin will be marked RO NX */
RO_DATA(PAGE_SIZE)
HYPERVISOR_RODATA_SECTIONS
.got : { *(.got) }
/*
* Make sure that the .got.plt is either completely empty or it
* contains only the lazy dispatch entries.
*/
.got.plt : { *(.got.plt) }
ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18,
"Unexpected GOT/PLT entries detected!")
/* code sections that are never executed via the kernel mapping */
.rodata.text : {
TRAMP_TEXT
HIBERNATE_TEXT
KEXEC_TEXT
IDMAP_TEXT
. =
ALIGN(PAGE_SIZE);
}
idmap_pg_dir = .;
. += PAGE_SIZE;
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
tramp_pg_dir = .;
. += PAGE_SIZE;
#endif
reserved_pg_dir = .;
. += PAGE_SIZE;
swapper_pg_dir = .;
. += PAGE_SIZE;
. =
ALIGN(SEGMENT_ALIGN);
__init_begin = .;
__inittext_begin = .;
INIT_TEXT_SECTION(8)
__exittext_begin = .;
.exit.text : {
EXIT_TEXT
}
__exittext_end = .;
. =
ALIGN(4);
.altinstructions : {
__alt_instructions = .;
*(.altinstructions)
__alt_instructions_end = .;
}
UNWIND_DATA_SECTIONS
. =
ALIGN(SEGMENT_ALIGN);
__inittext_end = .;
__initdata_begin = .;
__pi_init_idmap_pg_dir = .;
. += INIT_IDMAP_DIR_SIZE;
__pi_init_idmap_pg_end = .;
.init.
data : {
INIT_DATA
INIT_SETUP(16)
INIT_CALLS
CON_INITCALL
INIT_RAM_FS
*(.init.altinstructions .init.bss)
/* from the EFI stub */
}
.exit.
data : {
EXIT_DATA
}
RUNTIME_CONST_VARIABLES
PERCPU_SECTION(L1_CACHE_BYTES)
HYPERVISOR_PERCPU_SECTION
HYPERVISOR_RELOC_SECTION
.rela.dyn :
ALIGN(8) {
__pi_rela_start = .;
*(.rela .rela*)
__pi_rela_end = .;
}
.relr.dyn :
ALIGN(8) {
__pi_relr_start = .;
*(.relr.dyn)
__pi_relr_end = .;
}
. =
ALIGN(SEGMENT_ALIGN);
__initdata_end = .;
__init_end = .;
.
data.rel.ro : { *(.
data.rel.ro) }
ASSERT(SIZEOF(.
data.rel.ro) == 0,
"Unexpected RELRO detected!")
_
data = .;
_sdata = .;
RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
HYPERVISOR_DATA_SECTION
/*
* Data written with the MMU off but read with the MMU on requires
* cache lines to be invalidated, discarding up to a Cache Writeback
* Granule (CWG) of data from the cache. Keep the section that
* requires this type of maintenance to be in its own Cache Writeback
* Granule (CWG) area so the cache maintenance operations don't
* interfere with adjacent data.
*/
.mmuoff.
data.write :
ALIGN(SZ_2K) {
__mmuoff_data_start = .;
*(.mmuoff.
data.write)
}
. =
ALIGN(SZ_2K);
.mmuoff.
data.read : {
*(.mmuoff.
data.read)
__mmuoff_data_end = .;
}
PECOFF_EDATA_PADDING
__pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
_edata = .;
/* start of zero-init region */
BSS_SECTION(SBSS_ALIGN, 0, 0)
__pi___bss_start = __bss_start;
. =
ALIGN(PAGE_SIZE);
__pi_init_pg_dir = .;
. += INIT_DIR_SIZE;
__pi_init_pg_end = .;
/* end of zero-init region */
. += SZ_4K;
/* stack for the early C runtime */
early_init_stack = .;
. =
ALIGN(SEGMENT_ALIGN);
__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
_end = .;
__pi__end = .;
STABS_DEBUG
DWARF_DEBUG
ELF_DETAILS
HEAD_SYMBOLS
/*
* Sections that should stay zero sized, which is safer to
* explicitly check instead of blindly discarding.
*/
.plt : {
*(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
}
ASSERT(SIZEOF(.plt) == 0,
"Unexpected run-time procedure linkages detected!")
}
#include
"image-vars.h"
/*
* The HYP init code and ID map text can't be longer than a page each. The
* former is page-aligned, but the latter may not be with 16K or 64K pages, so
* it should also not cross a page boundary.
*/
ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE,
"HYP init code too big")
ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
"ID map text too big or misaligned")
#ifdef CONFIG_HIBERNATION
ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K,
"Hibernate exit text is bigger than 4 KiB")
ASSERT(__hibernate_exit_text_start == swsusp_arch_suspend_exit,
"Hibernate exit text does not start with swsusp_arch_suspend_exit")
#endif
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE,
"Entry trampoline text too big")
#endif
#ifdef CONFIG_KVM
ASSERT(__hyp_bss_start == __bss_start,
"HYP and Host BSS are misaligned")
#endif
/*
* If padding is applied before .head.text, virt<->phys conversions will fail.
*/
ASSERT(_text == KIMAGE_VADDR,
"HEAD is misaligned")
ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET,
"RESERVED_SWAPPER_OFFSET is wrong!")
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET,
"TRAMP_SWAPPER_OFFSET is wrong!")
#endif
#ifdef CONFIG_KEXEC_CORE
/* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */
ASSERT(__relocate_new_kernel_end - __relocate_new_kernel_start <= SZ_4K,
"kexec relocation code is bigger than 4 KiB")
ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K,
"KEXEC_CONTROL_PAGE_SIZE is broken")
ASSERT(__relocate_new_kernel_start == arm64_relocate_new_kernel,
"kexec control page does not start with arm64_relocate_new_kernel")
#endif
