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Diffstat (limited to 'arch/arm64/kernel/vmlinux.lds.S')
-rw-r--r--arch/arm64/kernel/vmlinux.lds.S279
1 files changed, 211 insertions, 68 deletions
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 7fa008374907..ad6133b89e7a 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -5,40 +5,94 @@
* 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/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); \
+ . = 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 \
@@ -49,7 +103,7 @@ jiffies = jiffies_64;
#ifdef CONFIG_HIBERNATION
#define HIBERNATE_TEXT \
- . = ALIGN(SZ_4K); \
+ ALIGN_FUNCTION(); \
__hibernate_exit_text_start = .; \
*(.hibernate_exit.text) \
__hibernate_exit_text_end = .;
@@ -57,21 +111,43 @@ jiffies = jiffies_64;
#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_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'
+ * 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.
*/
@@ -92,78 +168,83 @@ 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 .gnu.hash)
- *(.eh_frame)
+ *(.ARM.attributes)
}
- . = 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
TEXT_TEXT
SCHED_TEXT
- CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
HYPERVISOR_TEXT
- IDMAP_TEXT
- HIBERNATE_TEXT
- TRAMP_TEXT
- *(.fixup)
*(.gnu.warning)
- . = ALIGN(16);
- *(.got) /* Global offset table */
}
. = 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_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);
+ }
- . = ALIGN(PAGE_SIZE);
idmap_pg_dir = .;
- . += IDMAP_DIR_SIZE;
+ . += PAGE_SIZE;
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
tramp_pg_dir = .;
. += PAGE_SIZE;
#endif
-#ifdef CONFIG_ARM64_SW_TTBR0_PAN
- reserved_ttbr0 = .;
- . += RESERVED_TTBR0_SIZE;
-#endif
+ reserved_pg_dir = .;
+ . += PAGE_SIZE;
+
swapper_pg_dir = .;
. += PAGE_SIZE;
- swapper_pg_end = .;
. = 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 : {
@@ -171,42 +252,60 @@ SECTIONS
*(.altinstructions)
__alt_instructions_end = .;
}
- .altinstr_replacement : {
- *(.altinstr_replacement)
- }
- . = ALIGN(PAGE_SIZE);
+ 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.rodata.* .init.bss) /* from the EFI stub */
+ *(.init.altinstructions .init.bss) /* from the EFI stub */
}
.exit.data : {
- ARM_EXIT_KEEP(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 = .;
}
- __rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR);
- __rela_size = SIZEOF(.rela.dyn);
+ .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_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
+ 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
@@ -230,38 +329,82 @@ SECTIONS
__pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
_edata = .;
- BSS_SECTION(0, 0, 0)
+ /* start of zero-init region */
+ BSS_SECTION(SBSS_ALIGN, 0, 0)
+ __pi___bss_start = __bss_start;
. = ALIGN(PAGE_SIZE);
- init_pg_dir = .;
+ __pi_init_pg_dir = .;
. += INIT_DIR_SIZE;
- init_pg_end = .;
+ __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,
- * 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")
+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) == PAGE_SIZE,
+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")
+ASSERT(__relocate_new_kernel_start == arm64_relocate_new_kernel,
+ "kexec control page does not start with arm64_relocate_new_kernel")
+#endif
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