mirror of
https://github.com/torvalds/linux.git
synced 2024-11-26 22:21:42 +00:00
94a2bc0f61
This implements the runtime constant infrastructure for arm64, allowing the dcache d_hash() function to be generated using as a constant for hash table address followed by shift by a constant of the hash index. [ Fixed up to deal with the big-endian case as per Mark Rutland ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
397 lines
9.4 KiB
ArmAsm
397 lines
9.4 KiB
ArmAsm
/* 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_DATA_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_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_DATA_SECTIONS
|
|
#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)
|
|
}
|
|
|
|
. = 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_DATA_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 = .;
|
|
|
|
init_idmap_pg_dir = .;
|
|
. += INIT_IDMAP_DIR_SIZE;
|
|
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(shift, d_hash_shift)
|
|
RUNTIME_CONST(ptr, dentry_hashtable)
|
|
|
|
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 = .;
|
|
_sdata = .;
|
|
RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
|
|
|
|
/*
|
|
* 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)
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
init_pg_dir = .;
|
|
. += INIT_DIR_SIZE;
|
|
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 = .;
|
|
|
|
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!")
|
|
|
|
.data.rel.ro : { *(.data.rel.ro) }
|
|
ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO 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
|