diff options
Diffstat (limited to 'arch/arm64/kernel/vmlinux.lds.S')
| -rw-r--r-- | arch/arm64/kernel/vmlinux.lds.S | 275 |
1 files changed, 203 insertions, 72 deletions
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index fe56c268a7d9..45131e354e27 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -1,65 +1,130 @@ +/* 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/thread_info.h> +#include <asm/kexec.h> #include <asm/memory.h> #include <asm/page.h> -#include <asm/pgtable.h> #include "image.h" -/* .exit.text needed in case of alternative patching */ -#define ARM_EXIT_KEEP(x) x -#define ARM_EXIT_DISCARD(x) - OUTPUT_ARCH(aarch64) ENTRY(_text) jiffies = jiffies_64; #define HYPERVISOR_TEXT \ - /* \ - * Align to 4 KB so that \ - * a) the HYP vector table is at its minimum \ - * alignment of 2048 bytes \ - * b) the HYP init code will not cross a page \ - * boundary if its size does not exceed \ - * 4 KB (see related ASSERT() below) \ - */ \ - . = ALIGN(SZ_4K); \ - VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \ + . = ALIGN(PAGE_SIZE); \ + __hyp_idmap_text_start = .; \ *(.hyp.idmap.text) \ - VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; \ - VMLINUX_SYMBOL(__hyp_text_start) = .; \ + __hyp_idmap_text_end = .; \ + __hyp_text_start = .; \ *(.hyp.text) \ - VMLINUX_SYMBOL(__hyp_text_end) = .; + HYPERVISOR_EXTABLE \ + . = ALIGN(PAGE_SIZE); \ + __hyp_text_end = .; #define IDMAP_TEXT \ . = ALIGN(SZ_4K); \ - VMLINUX_SYMBOL(__idmap_text_start) = .; \ + __idmap_text_start = .; \ *(.idmap.text) \ - VMLINUX_SYMBOL(__idmap_text_end) = .; + __idmap_text_end = .; #ifdef CONFIG_HIBERNATION #define HIBERNATE_TEXT \ - . = ALIGN(SZ_4K); \ - VMLINUX_SYMBOL(__hibernate_exit_text_start) = .;\ + __hibernate_exit_text_start = .; \ *(.hibernate_exit.text) \ - VMLINUX_SYMBOL(__hibernate_exit_text_end) = .; + __hibernate_exit_text_end = .; #else #define HIBERNATE_TEXT #endif +#ifdef CONFIG_KEXEC_CORE +#define KEXEC_TEXT \ + __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 + /* * 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' + * 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. */ @@ -80,27 +145,20 @@ SECTIONS * matching the same input section name. There is no documented * order of matching. */ + DISCARDS /DISCARD/ : { - ARM_EXIT_DISCARD(EXIT_TEXT) - ARM_EXIT_DISCARD(EXIT_DATA) - EXIT_CALL - *(.discard) - *(.discard.*) *(.interp .dynamic) - *(.dynsym .dynstr .hash) + *(.dynsym .dynstr .hash .gnu.hash) } - . = KIMAGE_VADDR + TEXT_OFFSET; + . = KIMAGE_VADDR; .head.text : { _text = .; HEAD_TEXT } - .text : { /* Real text segment */ + .text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */ _stext = .; /* Text and read-only data */ - __exception_text_start = .; - *(.exception.text) - __exception_text_end = .; IRQENTRY_TEXT SOFTIRQENTRY_TEXT ENTRY_TEXT @@ -111,28 +169,60 @@ SECTIONS KPROBES_TEXT HYPERVISOR_TEXT IDMAP_TEXT - HIBERNATE_TEXT - *(.fixup) *(.gnu.warning) . = ALIGN(16); *(.got) /* Global offset table */ } + /* + * 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!") + . = ALIGN(SEGMENT_ALIGN); _etext = .; /* End of text section */ - RO_DATA(PAGE_SIZE) /* everything from this point to */ - EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */ - NOTES + /* everything from this point to __init_begin will be marked RO NX */ + RO_DATA(PAGE_SIZE) + + HYPERVISOR_DATA_SECTIONS + + /* code sections that are never executed via the kernel mapping */ + .rodata.text : { + TRAMP_TEXT + HIBERNATE_TEXT + KEXEC_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 : { - ARM_EXIT_KEEP(EXIT_TEXT) + EXIT_TEXT } + __exittext_end = .; . = ALIGN(4); .altinstructions : { @@ -140,35 +230,43 @@ SECTIONS *(.altinstructions) __alt_instructions_end = .; } - .altinstr_replacement : { - *(.altinstr_replacement) - } - . = ALIGN(PAGE_SIZE); + . = 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 - SECURITY_INITCALL INIT_RAM_FS - *(.init.rodata.* .init.bss) /* from the EFI stub */ + *(.init.altinstructions .init.bss) /* from the EFI stub */ } .exit.data : { - ARM_EXIT_KEEP(EXIT_DATA) + EXIT_DATA } PERCPU_SECTION(L1_CACHE_BYTES) + HYPERVISOR_PERCPU_SECTION + + HYPERVISOR_RELOC_SECTION - .rela : ALIGN(8) { + .rela.dyn : ALIGN(8) { + __rela_start = .; *(.rela .rela*) + __rela_end = .; } - __rela_offset = ABSOLUTE(ADDR(.rela) - KIMAGE_VADDR); - __rela_size = SIZEOF(.rela); + .relr.dyn : ALIGN(8) { + __relr_start = .; + *(.relr.dyn) + __relr_end = .; + } . = ALIGN(SEGMENT_ALIGN); __initdata_end = .; @@ -176,7 +274,7 @@ SECTIONS _data = .; _sdata = .; - RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) + RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) /* * Data written with the MMU off but read with the MMU on requires @@ -200,41 +298,74 @@ SECTIONS __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); _edata = .; - BSS_SECTION(0, 0, 0) + BSS_SECTION(SBSS_ALIGN, 0, 0) . = ALIGN(PAGE_SIZE); - idmap_pg_dir = .; - . += IDMAP_DIR_SIZE; - swapper_pg_dir = .; - . += SWAPPER_DIR_SIZE; - -#ifdef CONFIG_ARM64_SW_TTBR0_PAN - reserved_ttbr0 = .; - . += RESERVED_TTBR0_SIZE; -#endif + init_pg_dir = .; + . += INIT_DIR_SIZE; + init_pg_end = .; + . = 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, - * and should not cross a page boundary. + * 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 & ~(SZ_4K - 1)) <= SZ_4K, - "HYP init code too big or misaligned") +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 - 1)) - <= SZ_4K, "Hibernate exit text too big or misaligned") +ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K, + "Hibernate exit text is bigger than 4 KiB") +#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 + TEXT_OFFSET), "HEAD is misaligned") +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") +#endif |