summaryrefslogtreecommitdiffstats
path: root/arch/arm64/kernel/vmlinux.lds.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/kernel/vmlinux.lds.S')
-rw-r--r--arch/arm64/kernel/vmlinux.lds.S371
1 files changed, 371 insertions, 0 deletions
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
new file mode 100644
index 000000000..45131e354
--- /dev/null
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -0,0 +1,371 @@
+/* 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 \
+ __hibernate_exit_text_start = .; \
+ *(.hibernate_exit.text) \
+ __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'
+ * 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
+ CPUIDLE_TEXT
+ LOCK_TEXT
+ KPROBES_TEXT
+ HYPERVISOR_TEXT
+ IDMAP_TEXT
+ *(.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 */
+
+ /* 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 : {
+ EXIT_TEXT
+ }
+ __exittext_end = .;
+
+ . = ALIGN(4);
+ .altinstructions : {
+ __alt_instructions = .;
+ *(.altinstructions)
+ __alt_instructions_end = .;
+ }
+
+ . = 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
+ }
+
+ PERCPU_SECTION(L1_CACHE_BYTES)
+ HYPERVISOR_PERCPU_SECTION
+
+ HYPERVISOR_RELOC_SECTION
+
+ .rela.dyn : ALIGN(8) {
+ __rela_start = .;
+ *(.rela .rela*)
+ __rela_end = .;
+ }
+
+ .relr.dyn : ALIGN(8) {
+ __relr_start = .;
+ *(.relr.dyn)
+ __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 = .;
+
+ BSS_SECTION(SBSS_ALIGN, 0, 0)
+
+ . = ALIGN(PAGE_SIZE);
+ 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. 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")
+#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")
+#endif