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WSL2-Linux-Kernel/arch/arm64/kernel/vmlinux.lds.S

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ArmAsm
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arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
/*
* 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-generic/vmlinux.lds.h>
arm64: update linker script to increased L1_CACHE_BYTES value Bring the linker script in line with the recent increase of L1_CACHE_BYTES to 128. Replace the hardcoded value of 64 with the symbolic constant. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> [catalin.marinas@arm.com: fix up RW_DATA_SECTION as well] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-12-01 15:20:40 +03:00
#include <asm/cache.h>
arm64: Move swapper pagetable definitions Move the kernel pagetable (both swapper and idmap) definitions from the generic asm/page.h to a new file, asm/kernel-pgtable.h. This is mostly a cosmetic change, to clean up the asm/page.h to get rid of the arch specific details which are not needed by the generic code. Also renames the symbols to prevent conflicts. e.g, BLOCK_SHIFT => SWAPPER_BLOCK_SHIFT Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-10-19 16:19:27 +03:00
#include <asm/kernel-pgtable.h>
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
#include <asm/thread_info.h>
#include <asm/memory.h>
#include <asm/page.h>
arm64: add better page protections to arm64 Add page protections for arm64 similar to those in arm. This is for security reasons to prevent certain classes of exploits. The current method: - Map all memory as either RWX or RW. We round to the nearest section to avoid creating page tables before everything is mapped - Once everything is mapped, if either end of the RWX section should not be X, we split the PMD and remap as necessary - When initmem is to be freed, we change the permissions back to RW (using stop machine if necessary to flush the TLB) - If CONFIG_DEBUG_RODATA is set, the read only sections are set read only. Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Kees Cook <keescook@chromium.org> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-01-22 04:36:06 +03:00
#include <asm/pgtable.h>
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
arm64: Update the Image header Currently the kernel Image is stripped of everything past the initial stack, and at runtime the memory is initialised and used by the kernel. This makes the effective minimum memory footprint of the kernel larger than the size of the loaded binary, though bootloaders have no mechanism to identify how large this minimum memory footprint is. This makes it difficult to choose safe locations to place both the kernel and other binaries required at boot (DTB, initrd, etc), such that the kernel won't clobber said binaries or other reserved memory during initialisation. Additionally when big endian support was added the image load offset was overlooked, and is currently of an arbitrary endianness, which makes it difficult for bootloaders to make use of it. It seems that bootloaders aren't respecting the image load offset at present anyway, and are assuming that offset 0x80000 will always be correct. This patch adds an effective image size to the kernel header which describes the amount of memory from the start of the kernel Image binary which the kernel expects to use before detecting memory and handling any memory reservations. This can be used by bootloaders to choose suitable locations to load the kernel and/or other binaries such that the kernel will not clobber any memory unexpectedly. As before, memory reservations are required to prevent the kernel from clobbering these locations later. Both the image load offset and the effective image size are forced to be little-endian regardless of the native endianness of the kernel to enable bootloaders to load a kernel of arbitrary endianness. Bootloaders which wish to make use of the load offset can inspect the effective image size field for a non-zero value to determine if the offset is of a known endianness. To enable software to determine the endinanness of the kernel as may be required for certain use-cases, a new flags field (also little-endian) is added to the kernel header to export this information. The documentation is updated to clarify these details. To discourage future assumptions regarding the value of text_offset, the value at this point in time is removed from the main flow of the documentation (though kept as a compatibility note). Some minor formatting issues in the documentation are also corrected. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Tom Rini <trini@ti.com> Cc: Geoff Levand <geoff@infradead.org> Cc: Kevin Hilman <kevin.hilman@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-06-24 19:51:36 +04:00
#include "image.h"
arm64: vmlinux.lds.S: don't discard .exit.* sections at link-time .exit.* sections may be subject to patching by the new alternatives framework and so shouldn't be discarded at link-time. Without this patch, such a section will result in the following linker error: `.exit.text' referenced in section `.altinstructions' of drivers/built-in.o: defined in discarded section `.exit.text' of drivers/built-in.o Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-11-25 18:26:13 +03:00
/* .exit.text needed in case of alternative patching */
#define ARM_EXIT_KEEP(x) x
#define ARM_EXIT_DISCARD(x)
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
OUTPUT_ARCH(aarch64)
arm64: Fix linker script entry point Change the arm64 linker script ENTRY() command to define _text as the kernel entry point. The arm64 boot protocol specifies that the kernel must be entered at the beginning of the kernel image. The existing ENTRY() command defined the symbol stext as the entry point, which emitted an incorrect entry point, but would not cause a runtime error because the existing entry code immediately jumps to stext. Signed-off-by: Geoff Levand <geoff@infradead.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-05-16 21:26:01 +04:00
ENTRY(_text)
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
jiffies = jiffies_64;
arm64: KVM: HYP mode idmap support Add the necessary infrastructure for identity-mapped HYP page tables. Idmap-ed code must be in the ".hyp.idmap.text" linker section. The rest of the HYP ends up in ".hyp.text". Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-12-07 22:40:43 +04:00
#define HYPERVISOR_TEXT \
/* \
ARM, arm64: kvm: get rid of the bounce page The HYP init bounce page is a runtime construct that ensures that the HYP init code does not cross a page boundary. However, this is something we can do perfectly well at build time, by aligning the code appropriately. For arm64, we just align to 4 KB, and enforce that the code size is less than 4 KB, regardless of the chosen page size. For ARM, the whole code is less than 256 bytes, so we tweak the linker script to align at a power of 2 upper bound of the code size Note that this also fixes a benign off-by-one error in the original bounce page code, where a bounce page would be allocated unnecessarily if the code was exactly 1 page in size. On ARM, it also fixes an issue with very large kernels reported by Arnd Bergmann, where stub sections with linker emitted veneers could erroneously trigger the size/alignment ASSERT() in the linker script. Tested-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-03-19 19:42:26 +03:00
* 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) \
arm64: KVM: HYP mode idmap support Add the necessary infrastructure for identity-mapped HYP page tables. Idmap-ed code must be in the ".hyp.idmap.text" linker section. The rest of the HYP ends up in ".hyp.text". Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-12-07 22:40:43 +04:00
*/ \
ARM, arm64: kvm: get rid of the bounce page The HYP init bounce page is a runtime construct that ensures that the HYP init code does not cross a page boundary. However, this is something we can do perfectly well at build time, by aligning the code appropriately. For arm64, we just align to 4 KB, and enforce that the code size is less than 4 KB, regardless of the chosen page size. For ARM, the whole code is less than 256 bytes, so we tweak the linker script to align at a power of 2 upper bound of the code size Note that this also fixes a benign off-by-one error in the original bounce page code, where a bounce page would be allocated unnecessarily if the code was exactly 1 page in size. On ARM, it also fixes an issue with very large kernels reported by Arnd Bergmann, where stub sections with linker emitted veneers could erroneously trigger the size/alignment ASSERT() in the linker script. Tested-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-03-19 19:42:26 +03:00
. = ALIGN(SZ_4K); \
arm64: KVM: HYP mode idmap support Add the necessary infrastructure for identity-mapped HYP page tables. Idmap-ed code must be in the ".hyp.idmap.text" linker section. The rest of the HYP ends up in ".hyp.text". Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-12-07 22:40:43 +04:00
VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
*(.hyp.idmap.text) \
VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; \
VMLINUX_SYMBOL(__hyp_text_start) = .; \
*(.hyp.text) \
VMLINUX_SYMBOL(__hyp_text_end) = .;
arm64: reduce ID map to a single page Commit ea8c2e112445 ("arm64: Extend the idmap to the whole kernel image") changed the early page table code so that the entire kernel Image is covered by the identity map. This allows functions that need to enable or disable the MMU to reside anywhere in the kernel Image. However, this change has the unfortunate side effect that the Image cannot cross a physical 512 MB alignment boundary anymore, since the early page table code cannot deal with the Image crossing a /virtual/ 512 MB alignment boundary. So instead, reduce the ID map to a single page, that is populated by the contents of the .idmap.text section. Only three functions reside there at the moment: __enable_mmu(), cpu_resume_mmu() and cpu_reset(). If new code is introduced that needs to manipulate the MMU state, it should be added to this section as well. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-06-01 14:40:33 +03:00
#define IDMAP_TEXT \
. = ALIGN(SZ_4K); \
VMLINUX_SYMBOL(__idmap_text_start) = .; \
*(.idmap.text) \
VMLINUX_SYMBOL(__idmap_text_end) = .;
arm64: kernel: Add support for hibernate/suspend-to-disk Add support for hibernate/suspend-to-disk. Suspend borrows code from cpu_suspend() to write cpu state onto the stack, before calling swsusp_save() to save the memory image. Restore creates a set of temporary page tables, covering only the linear map, copies the restore code to a 'safe' page, then uses the copy to restore the memory image. The copied code executes in the lower half of the address space, and once complete, restores the original kernel's page tables. It then calls into cpu_resume(), and follows the normal cpu_suspend() path back into the suspend code. To restore a kernel using KASLR, the address of the page tables, and cpu_resume() are stored in the hibernate arch-header and the el2 vectors are pivotted via the 'safe' page in low memory. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Kevin Hilman <khilman@baylibre.com> # Tested on Juno R2 Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-27 19:47:12 +03:00
#ifdef CONFIG_HIBERNATION
#define HIBERNATE_TEXT \
. = ALIGN(SZ_4K); \
VMLINUX_SYMBOL(__hibernate_exit_text_start) = .;\
*(.hibernate_exit.text) \
VMLINUX_SYMBOL(__hibernate_exit_text_end) = .;
#else
#define HIBERNATE_TEXT
#endif
arm64/efi: set PE/COFF file alignment to 512 bytes Change our PE/COFF header to use the minimum file alignment of 512 bytes (0x200), as mandated by the PE/COFF spec v8.3 Also update the linker script so that the Image file itself is also a round multiple of FileAlignment. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Roy Franz <roy.franz@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-10 20:42:55 +04:00
/*
* 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
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
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.
*/
/DISCARD/ : {
ARM_EXIT_DISCARD(EXIT_TEXT)
ARM_EXIT_DISCARD(EXIT_DATA)
EXIT_CALL
*(.discard)
*(.discard.*)
arm64: add support for building vmlinux as a relocatable PIE binary This implements CONFIG_RELOCATABLE, which links the final vmlinux image with a dynamic relocation section, allowing the early boot code to perform a relocation to a different virtual address at runtime. This is a prerequisite for KASLR (CONFIG_RANDOMIZE_BASE). Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-01-26 11:13:44 +03:00
*(.interp .dynamic)
arm64: relocatable: suppress R_AARCH64_ABS64 relocations in vmlinux The linker routines that we rely on to produce a relocatable PIE binary treat it as a shared ELF object in some ways, i.e., it emits symbol based R_AARCH64_ABS64 relocations into the final binary since doing so would be appropriate when linking a shared library that is subject to symbol preemption. (This means that an executable can override certain symbols that are exported by a shared library it is linked with, and that the shared library *must* update all its internal references as well, and point them to the version provided by the executable.) Symbol preemption does not occur for OS hosted PIE executables, let alone for vmlinux, and so we would prefer to get rid of these symbol based relocations. This would allow us to simplify the relocation routines, and to strip the .dynsym, .dynstr and .hash sections from the binary. (Note that these are tiny, and are placed in the .init segment, but they clutter up the vmlinux binary.) Note that these R_AARCH64_ABS64 relocations are only emitted for absolute references to symbols defined in the linker script, all other relocatable quantities are covered by anonymous R_AARCH64_RELATIVE relocations that simply list the offsets to all 64-bit values in the binary that need to be fixed up based on the offset between the link time and run time addresses. Fortunately, GNU ld has a -Bsymbolic option, which is intended for shared libraries to allow them to ignore symbol preemption, and unconditionally bind all internal symbol references to its own definitions. So set it for our PIE binary as well, and get rid of the asoociated sections and the relocation code that processes them. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [will: fixed conflict with __dynsym_offset linker script entry] Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-07-24 15:00:13 +03:00
*(.dynsym .dynstr .hash)
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
}
arm64: introduce KIMAGE_VADDR as the virtual base of the kernel region This introduces the preprocessor symbol KIMAGE_VADDR which will serve as the symbolic virtual base of the kernel region, i.e., the kernel's virtual offset will be KIMAGE_VADDR + TEXT_OFFSET. For now, we define it as being equal to PAGE_OFFSET, but in the future, it will be moved below it once we move the kernel virtual mapping out of the linear mapping. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-02-16 15:52:36 +03:00
. = KIMAGE_VADDR + TEXT_OFFSET;
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
.head.text : {
_text = .;
HEAD_TEXT
}
.text : { /* Real text segment */
_stext = .; /* Text and read-only data */
__exception_text_start = .;
*(.exception.text)
__exception_text_end = .;
IRQENTRY_TEXT
arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections KASAN needs to know whether the allocation happens in an IRQ handler. This lets us strip everything below the IRQ entry point to reduce the number of unique stack traces needed to be stored. Move the definition of __irq_entry to <linux/interrupt.h> so that the users don't need to pull in <linux/ftrace.h>. Also introduce the __softirq_entry macro which is similar to __irq_entry, but puts the corresponding functions to the .softirqentry.text section. Signed-off-by: Alexander Potapenko <glider@google.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Andrey Konovalov <adech.fo@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Konstantin Serebryany <kcc@google.com> Cc: Dmitry Chernenkov <dmitryc@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-03-26 00:22:05 +03:00
SOFTIRQENTRY_TEXT
arm64: Treat all entry code as non-kprobe-able Entry symbols are not kprobe safe. So blacklist them for kprobing. Signed-off-by: Pratyush Anand <panand@redhat.com> Signed-off-by: David A. Long <dave.long@linaro.org> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> [catalin.marinas@arm.com: Do not include syscall wrappers in .entry.text] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-07-08 19:35:50 +03:00
ENTRY_TEXT
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
TEXT_TEXT
SCHED_TEXT
nmi_backtrace: generate one-line reports for idle cpus When doing an nmi backtrace of many cores, most of which are idle, the output is a little overwhelming and very uninformative. Suppress messages for cpus that are idling when they are interrupted and just emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN". We do this by grouping all the cpuidle code together into a new .cpuidle.text section, and then checking the address of the interrupted PC to see if it lies within that section. This commit suitably tags x86 and tile idle routines, and only adds in the minimal framework for other architectures. Link: http://lkml.kernel.org/r/1472487169-14923-5-git-send-email-cmetcalf@mellanox.com Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Daniel Thompson <daniel.thompson@linaro.org> [arm] Tested-by: Petr Mladek <pmladek@suse.com> Cc: Aaron Tomlin <atomlin@redhat.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-08 03:02:55 +03:00
CPUIDLE_TEXT
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
LOCK_TEXT
arm64: Kprobes with single stepping support Add support for basic kernel probes(kprobes) and jump probes (jprobes) for ARM64. Kprobes utilizes software breakpoint and single step debug exceptions supported on ARM v8. A software breakpoint is placed at the probe address to trap the kernel execution into the kprobe handler. ARM v8 supports enabling single stepping before the break exception return (ERET), with next PC in exception return address (ELR_EL1). The kprobe handler prepares an executable memory slot for out-of-line execution with a copy of the original instruction being probed, and enables single stepping. The PC is set to the out-of-line slot address before the ERET. With this scheme, the instruction is executed with the exact same register context except for the PC (and DAIF) registers. Debug mask (PSTATE.D) is enabled only when single stepping a recursive kprobe, e.g.: during kprobes reenter so that probed instruction can be single stepped within the kprobe handler -exception- context. The recursion depth of kprobe is always 2, i.e. upon probe re-entry, any further re-entry is prevented by not calling handlers and the case counted as a missed kprobe). Single stepping from the x-o-l slot has a drawback for PC-relative accesses like branching and symbolic literals access as the offset from the new PC (slot address) may not be ensured to fit in the immediate value of the opcode. Such instructions need simulation, so reject probing them. Instructions generating exceptions or cpu mode change are rejected for probing. Exclusive load/store instructions are rejected too. Additionally, the code is checked to see if it is inside an exclusive load/store sequence (code from Pratyush). System instructions are mostly enabled for stepping, except MSR/MRS accesses to "DAIF" flags in PSTATE, which are not safe for probing. This also changes arch/arm64/include/asm/ptrace.h to use include/asm-generic/ptrace.h. Thanks to Steve Capper and Pratyush Anand for several suggested Changes. Signed-off-by: Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com> Signed-off-by: David A. Long <dave.long@linaro.org> Signed-off-by: Pratyush Anand <panand@redhat.com> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-07-08 19:35:48 +03:00
KPROBES_TEXT
arm64: KVM: HYP mode idmap support Add the necessary infrastructure for identity-mapped HYP page tables. Idmap-ed code must be in the ".hyp.idmap.text" linker section. The rest of the HYP ends up in ".hyp.text". Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-12-07 22:40:43 +04:00
HYPERVISOR_TEXT
arm64: reduce ID map to a single page Commit ea8c2e112445 ("arm64: Extend the idmap to the whole kernel image") changed the early page table code so that the entire kernel Image is covered by the identity map. This allows functions that need to enable or disable the MMU to reside anywhere in the kernel Image. However, this change has the unfortunate side effect that the Image cannot cross a physical 512 MB alignment boundary anymore, since the early page table code cannot deal with the Image crossing a /virtual/ 512 MB alignment boundary. So instead, reduce the ID map to a single page, that is populated by the contents of the .idmap.text section. Only three functions reside there at the moment: __enable_mmu(), cpu_resume_mmu() and cpu_reset(). If new code is introduced that needs to manipulate the MMU state, it should be added to this section as well. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-06-01 14:40:33 +03:00
IDMAP_TEXT
arm64: kernel: Add support for hibernate/suspend-to-disk Add support for hibernate/suspend-to-disk. Suspend borrows code from cpu_suspend() to write cpu state onto the stack, before calling swsusp_save() to save the memory image. Restore creates a set of temporary page tables, covering only the linear map, copies the restore code to a 'safe' page, then uses the copy to restore the memory image. The copied code executes in the lower half of the address space, and once complete, restores the original kernel's page tables. It then calls into cpu_resume(), and follows the normal cpu_suspend() path back into the suspend code. To restore a kernel using KASLR, the address of the page tables, and cpu_resume() are stored in the hibernate arch-header and the el2 vectors are pivotted via the 'safe' page in low memory. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Kevin Hilman <khilman@baylibre.com> # Tested on Juno R2 Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-27 19:47:12 +03:00
HIBERNATE_TEXT
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
*(.fixup)
*(.gnu.warning)
. = ALIGN(16);
*(.got) /* Global offset table */
}
arm64: simplify kernel segment mapping granularity The mapping of the kernel consist of four segments, each of which is mapped with different permission attributes and/or lifetimes. To optimize the TLB and translation table footprint, we define various opaque constants in the linker script that resolve to different aligment values depending on the page size and whether CONFIG_DEBUG_ALIGN_RODATA is set. Considering that - a 4 KB granule kernel benefits from a 64 KB segment alignment (due to the fact that it allows the use of the contiguous bit), - the minimum alignment of the .data segment is THREAD_SIZE already, not PAGE_SIZE (i.e., we already have padding between _data and the start of the .data payload in many cases), - 2 MB is a suitable alignment value on all granule sizes, either for mapping directly (level 2 on 4 KB), or via the contiguous bit (level 3 on 16 KB and 64 KB), - anything beyond 2 MB exceeds the minimum alignment mandated by the boot protocol, and can only be mapped efficiently if the physical alignment happens to be the same, we can simplify this by standardizing on 64 KB (or 2 MB) explicitly, i.e., regardless of granule size, all segments are aligned either to 64 KB, or to 2 MB if CONFIG_DEBUG_ALIGN_RODATA=y. This also means we can drop the Kconfig dependency of CONFIG_DEBUG_ALIGN_RODATA on CONFIG_ARM64_4K_PAGES. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-03-30 18:43:09 +03:00
. = ALIGN(SEGMENT_ALIGN);
arm64: mm: fix location of _etext As Kees Cook notes in the ARM counterpart of this patch [0]: The _etext position is defined to be the end of the kernel text code, and should not include any part of the data segments. This interferes with things that might check memory ranges and expect executable code up to _etext. In particular, Kees is referring to the HARDENED_USERCOPY patch set [1], which rejects attempts to call copy_to_user() on kernel ranges containing executable code, but does allow access to the .rodata segment. Regardless of whether one may or may not agree with the distinction, it makes sense for _etext to have the same meaning across architectures. So let's put _etext where it belongs, between .text and .rodata, and fix up existing references to use __init_begin instead, which unlike _end_rodata includes the exception and notes sections as well. The _etext references in kaslr.c are left untouched, since its references to [_stext, _etext) are meant to capture potential jump instruction targets, and so disregarding .rodata is actually an improvement here. [0] http://article.gmane.org/gmane.linux.kernel/2245084 [1] http://thread.gmane.org/gmane.linux.kernel.hardened.devel/2502 Reported-by: Kees Cook <keescook@chromium.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-06-23 16:53:17 +03:00
_etext = .; /* End of text section */
RO_DATA(PAGE_SIZE) /* everything from this point to */
EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */
arm64: move elf notes into readonly segment The current vmlinux.lds.S places the notes sections between the end of rw data and start of bss. This means that _edata doesn't really point to the end of data. Since notes are read-only, this patch moves them to the read-only segment so that _edata does point to the end of initialized rw data. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-08-23 19:16:42 +04:00
NOTES
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
arm64: simplify kernel segment mapping granularity The mapping of the kernel consist of four segments, each of which is mapped with different permission attributes and/or lifetimes. To optimize the TLB and translation table footprint, we define various opaque constants in the linker script that resolve to different aligment values depending on the page size and whether CONFIG_DEBUG_ALIGN_RODATA is set. Considering that - a 4 KB granule kernel benefits from a 64 KB segment alignment (due to the fact that it allows the use of the contiguous bit), - the minimum alignment of the .data segment is THREAD_SIZE already, not PAGE_SIZE (i.e., we already have padding between _data and the start of the .data payload in many cases), - 2 MB is a suitable alignment value on all granule sizes, either for mapping directly (level 2 on 4 KB), or via the contiguous bit (level 3 on 16 KB and 64 KB), - anything beyond 2 MB exceeds the minimum alignment mandated by the boot protocol, and can only be mapped efficiently if the physical alignment happens to be the same, we can simplify this by standardizing on 64 KB (or 2 MB) explicitly, i.e., regardless of granule size, all segments are aligned either to 64 KB, or to 2 MB if CONFIG_DEBUG_ALIGN_RODATA=y. This also means we can drop the Kconfig dependency of CONFIG_DEBUG_ALIGN_RODATA on CONFIG_ARM64_4K_PAGES. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-03-30 18:43:09 +03:00
. = ALIGN(SEGMENT_ALIGN);
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
__init_begin = .;
arm64: mmu: apply strict permissions to .init.text and .init.data To avoid having mappings that are writable and executable at the same time, split the init region into a .init.text region that is mapped read-only, and a .init.data region that is mapped non-executable. This is possible now that the alternative patching occurs via the linear mapping, and the linear alias of the init region is always mapped writable (but never executable). Since the alternatives descriptions themselves are read-only data, move those into the .init.text region. Reviewed-by: Laura Abbott <labbott@redhat.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2017-03-09 23:52:03 +03:00
__inittext_begin = .;
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
INIT_TEXT_SECTION(8)
.exit.text : {
ARM_EXIT_KEEP(EXIT_TEXT)
}
arm64: add better page protections to arm64 Add page protections for arm64 similar to those in arm. This is for security reasons to prevent certain classes of exploits. The current method: - Map all memory as either RWX or RW. We round to the nearest section to avoid creating page tables before everything is mapped - Once everything is mapped, if either end of the RWX section should not be X, we split the PMD and remap as necessary - When initmem is to be freed, we change the permissions back to RW (using stop machine if necessary to flush the TLB) - If CONFIG_DEBUG_RODATA is set, the read only sections are set read only. Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Kees Cook <keescook@chromium.org> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-01-22 04:36:06 +03:00
arm64: mmu: apply strict permissions to .init.text and .init.data To avoid having mappings that are writable and executable at the same time, split the init region into a .init.text region that is mapped read-only, and a .init.data region that is mapped non-executable. This is possible now that the alternative patching occurs via the linear mapping, and the linear alias of the init region is always mapped writable (but never executable). Since the alternatives descriptions themselves are read-only data, move those into the .init.text region. Reviewed-by: Laura Abbott <labbott@redhat.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2017-03-09 23:52:03 +03:00
. = ALIGN(4);
.altinstructions : {
__alt_instructions = .;
*(.altinstructions)
__alt_instructions_end = .;
}
.altinstr_replacement : {
*(.altinstr_replacement)
}
. = ALIGN(PAGE_SIZE);
__inittext_end = .;
__initdata_begin = .;
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
.init.data : {
INIT_DATA
INIT_SETUP(16)
INIT_CALLS
CON_INITCALL
SECURITY_INITCALL
INIT_RAM_FS
arm64/vmlinux.lds.S: Handle .init.rodata.xxx and .init.bss sections The EFI stub is typically built into the decompressor (x86, ARM) so none of its symbols are annotated as __init. However, on arm64, the stub is linked into the kernel proper, and the code is __init annotated at the section level by prepending all names of SHF_ALLOC sections with '.init'. This results in section names like .init.rodata.str1.8 (for string literals) and .init.bss (which is tiny), both of which can be moved into the .init.data output section. Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1455712566-16727-6-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-02-17 15:35:58 +03:00
*(.init.rodata.* .init.bss) /* from the EFI stub */
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
}
.exit.data : {
ARM_EXIT_KEEP(EXIT_DATA)
}
arm64: update linker script to increased L1_CACHE_BYTES value Bring the linker script in line with the recent increase of L1_CACHE_BYTES to 128. Replace the hardcoded value of 64 with the symbolic constant. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> [catalin.marinas@arm.com: fix up RW_DATA_SECTION as well] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-12-01 15:20:40 +03:00
PERCPU_SECTION(L1_CACHE_BYTES)
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
arm64: add support for building vmlinux as a relocatable PIE binary This implements CONFIG_RELOCATABLE, which links the final vmlinux image with a dynamic relocation section, allowing the early boot code to perform a relocation to a different virtual address at runtime. This is a prerequisite for KASLR (CONFIG_RANDOMIZE_BASE). Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-01-26 11:13:44 +03:00
.rela : ALIGN(8) {
*(.rela .rela*)
}
arm64: add alternative runtime patching With a blatant copy of some x86 bits we introduce the alternative runtime patching "framework" to arm64. This is quite basic for now and we only provide the functions we need at this time. This is connected to the newly introduced feature bits. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-11-14 18:54:08 +03:00
arm64: vmlinux.lds: make __rela_offset and __dynsym_offset ABSOLUTE Due to the untyped KIMAGE_VADDR constant, the linker may not notice that the __rela_offset and __dynsym_offset expressions are absolute values (i.e., are not subject to relocation). This does not matter for KASLR, but it does confuse kallsyms in relative mode, since it uses the lowest non-absolute symbol address as the anchor point, and expects all other symbol addresses to be within 4 GB of it. Fix this by qualifying these expressions as ABSOLUTE() explicitly. Fixes: 0cd3defe0af4 ("arm64: kernel: perform relocation processing from ID map") Cc: <stable@vger.kernel.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-07-28 17:15:14 +03:00
__rela_offset = ABSOLUTE(ADDR(.rela) - KIMAGE_VADDR);
arm64: kernel: perform relocation processing from ID map Refactor the relocation processing so that the code executes from the ID map while accessing the relocation tables via the virtual mapping. This way, we can use literals containing virtual addresses as before, instead of having to use convoluted absolute expressions. For symmetry with the secondary code path, the relocation code and the subsequent jump to the virtual entry point are implemented in a function called __primary_switch(), and __mmap_switched() is renamed to __primary_switched(). Also, the call sequence in stext() is aligned with the one in secondary_startup(), by replacing the awkward 'adr_l lr' and 'b cpu_setup' sequence with a simple branch and link. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-18 18:09:43 +03:00
__rela_size = SIZEOF(.rela);
arm64: simplify kernel segment mapping granularity The mapping of the kernel consist of four segments, each of which is mapped with different permission attributes and/or lifetimes. To optimize the TLB and translation table footprint, we define various opaque constants in the linker script that resolve to different aligment values depending on the page size and whether CONFIG_DEBUG_ALIGN_RODATA is set. Considering that - a 4 KB granule kernel benefits from a 64 KB segment alignment (due to the fact that it allows the use of the contiguous bit), - the minimum alignment of the .data segment is THREAD_SIZE already, not PAGE_SIZE (i.e., we already have padding between _data and the start of the .data payload in many cases), - 2 MB is a suitable alignment value on all granule sizes, either for mapping directly (level 2 on 4 KB), or via the contiguous bit (level 3 on 16 KB and 64 KB), - anything beyond 2 MB exceeds the minimum alignment mandated by the boot protocol, and can only be mapped efficiently if the physical alignment happens to be the same, we can simplify this by standardizing on 64 KB (or 2 MB) explicitly, i.e., regardless of granule size, all segments are aligned either to 64 KB, or to 2 MB if CONFIG_DEBUG_ALIGN_RODATA=y. This also means we can drop the Kconfig dependency of CONFIG_DEBUG_ALIGN_RODATA on CONFIG_ARM64_4K_PAGES. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-03-30 18:43:09 +03:00
. = ALIGN(SEGMENT_ALIGN);
arm64: mmu: apply strict permissions to .init.text and .init.data To avoid having mappings that are writable and executable at the same time, split the init region into a .init.text region that is mapped read-only, and a .init.data region that is mapped non-executable. This is possible now that the alternative patching occurs via the linear mapping, and the linear alias of the init region is always mapped writable (but never executable). Since the alternatives descriptions themselves are read-only data, move those into the .init.text region. Reviewed-by: Laura Abbott <labbott@redhat.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2017-03-09 23:52:03 +03:00
__initdata_end = .;
arm64: mm: fold alternatives into .init Currently we treat the alternatives separately from other data that's only used during initialisation, using separate .altinstructions and .altinstr_replacement linker sections. These are freed for general allocation separately from .init*. This is problematic as: * We do not remove execute permissions, as we do for .init, leaving the memory executable. * We pad between them, making the kernel Image bianry up to PAGE_SIZE bytes larger than necessary. This patch moves the two sections into the contiguous region used for .init*. This saves some memory, ensures that we remove execute permissions, and allows us to remove some code made redundant by this reorganisation. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Andre Przywara <andre.przywara@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Jeremy Linton <jeremy.linton@arm.com> Cc: Laura Abbott <labbott@fedoraproject.org> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-12-09 15:44:38 +03:00
__init_end = .;
arm64: use generic RW_DATA_SECTION macro in linker script The .data section in the arm64 linker script currently lacks a definition for page-aligned data. This leads to a .page_aligned section being placed between the end of data and start of bss. This patch corrects that by using the generic RW_DATA_SECTION macro which includes support for page-aligned data. Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-11-04 20:38:47 +04:00
_data = .;
_sdata = .;
arm64: add basic VMAP_STACK support This patch enables arm64 to be built with vmap'd task and IRQ stacks. As vmap'd stacks are mapped at page granularity, stacks must be a multiple of PAGE_SIZE. This means that a 64K page kernel must use stacks of at least 64K in size. To minimize the increase in Image size, IRQ stacks are dynamically allocated at boot time, rather than embedding the boot CPU's IRQ stack in the kernel image. This patch was co-authored by Ard Biesheuvel and Mark Rutland. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Tested-by: Laura Abbott <labbott@redhat.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com>
2017-07-21 16:25:33 +03:00
RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
arm64: vmlinux.ld: Add mmuoff data sections and move mmuoff text into idmap Resume from hibernate needs to clean any text executed by the kernel with the MMU off to the PoC. Collect these functions together into the .idmap.text section as all this code is tightly coupled and also needs the same cleaning after resume. Data is more complicated, secondary_holding_pen_release is written with the MMU on, clean and invalidated, then read with the MMU off. In contrast __boot_cpu_mode is written with the MMU off, the corresponding cache line is invalidated, so when we read it with the MMU on we don't get stale data. These cache maintenance operations conflict with each other if the values are within a Cache Writeback Granule (CWG) of each other. Collect the data into two sections .mmuoff.data.read and .mmuoff.data.write, the linker script ensures mmuoff.data.write section is aligned to the architectural maximum CWG of 2KB. Signed-off-by: James Morse <james.morse@arm.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-08-24 20:27:29 +03:00
/*
* 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 = .;
}
arm64/efi: set PE/COFF file alignment to 512 bytes Change our PE/COFF header to use the minimum file alignment of 512 bytes (0x200), as mandated by the PE/COFF spec v8.3 Also update the linker script so that the Image file itself is also a round multiple of FileAlignment. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Roy Franz <roy.franz@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-10-10 20:42:55 +04:00
PECOFF_EDATA_PADDING
arm64: efi: split Image code and data into separate PE/COFF sections To prevent unintended modifications to the kernel text (malicious or otherwise) while running the EFI stub, describe the kernel image as two separate sections: a .text section with read-execute permissions, covering .text, .rodata and .init.text, and a .data section with read-write permissions, covering .init.data, .data and .bss. This relies on the firmware to actually take the section permission flags into account, but this is something that is currently being implemented in EDK2, which means we will likely start seeing it in the wild between one and two years from now. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2017-03-23 22:00:51 +03:00
__pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
arm64: use generic RW_DATA_SECTION macro in linker script The .data section in the arm64 linker script currently lacks a definition for page-aligned data. This leads to a .page_aligned section being placed between the end of data and start of bss. This patch corrects that by using the generic RW_DATA_SECTION macro which includes support for page-aligned data. Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-11-04 20:38:47 +04:00
_edata = .;
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
BSS_SECTION(0, 0, 0)
arm64: place initial page tables above the kernel Currently we place swapper_pg_dir and idmap_pg_dir below the kernel image, between PHYS_OFFSET and (PHYS_OFFSET + TEXT_OFFSET). However, bootloaders may use portions of this memory below the kernel and we do not parse the memory reservation list until after the MMU has been enabled. As such we may clobber some memory a bootloader wishes to have preserved. To enable the use of all of this memory by bootloaders (when the required memory reservations are communicated to the kernel) it is necessary to move our initial page tables elsewhere. As we currently have an effectively unbound requirement for memory at the end of the kernel image for .bss, we can place the page tables here. This patch moves the initial page table to the end of the kernel image, after the BSS. As they do not consist of any initialised data they will be stripped from the kernel Image as with the BSS. The BSS clearing routine is updated to stop at __bss_stop rather than _end so as to not clobber the page tables, and memory reservations made redundant by the new organisation are removed. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Laura Abbott <lauraa@codeaurora.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-06-24 19:51:35 +04:00
. = ALIGN(PAGE_SIZE);
idmap_pg_dir = .;
. += IDMAP_DIR_SIZE;
swapper_pg_dir = .;
. += SWAPPER_DIR_SIZE;
arm64: Introduce uaccess_{disable,enable} functionality based on TTBR0_EL1 This patch adds the uaccess macros/functions to disable access to user space by setting TTBR0_EL1 to a reserved zeroed page. Since the value written to TTBR0_EL1 must be a physical address, for simplicity this patch introduces a reserved_ttbr0 page at a constant offset from swapper_pg_dir. The uaccess_disable code uses the ttbr1_el1 value adjusted by the reserved_ttbr0 offset. Enabling access to user is done by restoring TTBR0_EL1 with the value from the struct thread_info ttbr0 variable. Interrupts must be disabled during the uaccess_ttbr0_enable code to ensure the atomicity of the thread_info.ttbr0 read and TTBR0_EL1 write. This patch also moves the get_thread_info asm macro from entry.S to assembler.h for reuse in the uaccess_ttbr0_* macros. Cc: Will Deacon <will.deacon@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Kees Cook <keescook@chromium.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-07-01 18:53:00 +03:00
#ifdef CONFIG_ARM64_SW_TTBR0_PAN
reserved_ttbr0 = .;
. += RESERVED_TTBR0_SIZE;
#endif
arm64: efi: split Image code and data into separate PE/COFF sections To prevent unintended modifications to the kernel text (malicious or otherwise) while running the EFI stub, describe the kernel image as two separate sections: a .text section with read-execute permissions, covering .text, .rodata and .init.text, and a .data section with read-write permissions, covering .init.data, .data and .bss. This relies on the firmware to actually take the section permission flags into account, but this is something that is currently being implemented in EDK2, which means we will likely start seeing it in the wild between one and two years from now. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2017-03-23 22:00:51 +03:00
__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
_end = .;
STABS_DEBUG
arm64: Update the Image header Currently the kernel Image is stripped of everything past the initial stack, and at runtime the memory is initialised and used by the kernel. This makes the effective minimum memory footprint of the kernel larger than the size of the loaded binary, though bootloaders have no mechanism to identify how large this minimum memory footprint is. This makes it difficult to choose safe locations to place both the kernel and other binaries required at boot (DTB, initrd, etc), such that the kernel won't clobber said binaries or other reserved memory during initialisation. Additionally when big endian support was added the image load offset was overlooked, and is currently of an arbitrary endianness, which makes it difficult for bootloaders to make use of it. It seems that bootloaders aren't respecting the image load offset at present anyway, and are assuming that offset 0x80000 will always be correct. This patch adds an effective image size to the kernel header which describes the amount of memory from the start of the kernel Image binary which the kernel expects to use before detecting memory and handling any memory reservations. This can be used by bootloaders to choose suitable locations to load the kernel and/or other binaries such that the kernel will not clobber any memory unexpectedly. As before, memory reservations are required to prevent the kernel from clobbering these locations later. Both the image load offset and the effective image size are forced to be little-endian regardless of the native endianness of the kernel to enable bootloaders to load a kernel of arbitrary endianness. Bootloaders which wish to make use of the load offset can inspect the effective image size field for a non-zero value to determine if the offset is of a known endianness. To enable software to determine the endinanness of the kernel as may be required for certain use-cases, a new flags field (also little-endian) is added to the kernel header to export this information. The documentation is updated to clarify these details. To discourage future assumptions regarding the value of text_offset, the value at this point in time is removed from the main flow of the documentation (though kept as a compatibility note). Some minor formatting issues in the documentation are also corrected. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Tom Rini <trini@ti.com> Cc: Geoff Levand <geoff@infradead.org> Cc: Kevin Hilman <kevin.hilman@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-06-24 19:51:36 +04:00
HEAD_SYMBOLS
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
2012-04-20 17:45:54 +04:00
}
arm64: KVM: HYP mode idmap support Add the necessary infrastructure for identity-mapped HYP page tables. Idmap-ed code must be in the ".hyp.idmap.text" linker section. The rest of the HYP ends up in ".hyp.text". Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-12-07 22:40:43 +04:00
/*
arm64: reduce ID map to a single page Commit ea8c2e112445 ("arm64: Extend the idmap to the whole kernel image") changed the early page table code so that the entire kernel Image is covered by the identity map. This allows functions that need to enable or disable the MMU to reside anywhere in the kernel Image. However, this change has the unfortunate side effect that the Image cannot cross a physical 512 MB alignment boundary anymore, since the early page table code cannot deal with the Image crossing a /virtual/ 512 MB alignment boundary. So instead, reduce the ID map to a single page, that is populated by the contents of the .idmap.text section. Only three functions reside there at the moment: __enable_mmu(), cpu_resume_mmu() and cpu_reset(). If new code is introduced that needs to manipulate the MMU state, it should be added to this section as well. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-06-01 14:40:33 +03:00
* The HYP init code and ID map text can't be longer than a page each,
ARM, arm64: kvm: get rid of the bounce page The HYP init bounce page is a runtime construct that ensures that the HYP init code does not cross a page boundary. However, this is something we can do perfectly well at build time, by aligning the code appropriately. For arm64, we just align to 4 KB, and enforce that the code size is less than 4 KB, regardless of the chosen page size. For ARM, the whole code is less than 256 bytes, so we tweak the linker script to align at a power of 2 upper bound of the code size Note that this also fixes a benign off-by-one error in the original bounce page code, where a bounce page would be allocated unnecessarily if the code was exactly 1 page in size. On ARM, it also fixes an issue with very large kernels reported by Arnd Bergmann, where stub sections with linker emitted veneers could erroneously trigger the size/alignment ASSERT() in the linker script. Tested-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-03-19 19:42:26 +03:00
* and should not cross a page boundary.
arm64: KVM: HYP mode idmap support Add the necessary infrastructure for identity-mapped HYP page tables. Idmap-ed code must be in the ".hyp.idmap.text" linker section. The rest of the HYP ends up in ".hyp.text". Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-12-07 22:40:43 +04:00
*/
ARM, arm64: kvm: get rid of the bounce page The HYP init bounce page is a runtime construct that ensures that the HYP init code does not cross a page boundary. However, this is something we can do perfectly well at build time, by aligning the code appropriately. For arm64, we just align to 4 KB, and enforce that the code size is less than 4 KB, regardless of the chosen page size. For ARM, the whole code is less than 256 bytes, so we tweak the linker script to align at a power of 2 upper bound of the code size Note that this also fixes a benign off-by-one error in the original bounce page code, where a bounce page would be allocated unnecessarily if the code was exactly 1 page in size. On ARM, it also fixes an issue with very large kernels reported by Arnd Bergmann, where stub sections with linker emitted veneers could erroneously trigger the size/alignment ASSERT() in the linker script. Tested-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2015-03-19 19:42:26 +03:00
ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
"HYP init code too big or misaligned")
arm64: reduce ID map to a single page Commit ea8c2e112445 ("arm64: Extend the idmap to the whole kernel image") changed the early page table code so that the entire kernel Image is covered by the identity map. This allows functions that need to enable or disable the MMU to reside anywhere in the kernel Image. However, this change has the unfortunate side effect that the Image cannot cross a physical 512 MB alignment boundary anymore, since the early page table code cannot deal with the Image crossing a /virtual/ 512 MB alignment boundary. So instead, reduce the ID map to a single page, that is populated by the contents of the .idmap.text section. Only three functions reside there at the moment: __enable_mmu(), cpu_resume_mmu() and cpu_reset(). If new code is introduced that needs to manipulate the MMU state, it should be added to this section as well. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-06-01 14:40:33 +03:00
ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
"ID map text too big or misaligned")
arm64: kernel: Add support for hibernate/suspend-to-disk Add support for hibernate/suspend-to-disk. Suspend borrows code from cpu_suspend() to write cpu state onto the stack, before calling swsusp_save() to save the memory image. Restore creates a set of temporary page tables, covering only the linear map, copies the restore code to a 'safe' page, then uses the copy to restore the memory image. The copied code executes in the lower half of the address space, and once complete, restores the original kernel's page tables. It then calls into cpu_resume(), and follows the normal cpu_suspend() path back into the suspend code. To restore a kernel using KASLR, the address of the page tables, and cpu_resume() are stored in the hibernate arch-header and the el2 vectors are pivotted via the 'safe' page in low memory. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Kevin Hilman <khilman@baylibre.com> # Tested on Juno R2 Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-27 19:47:12 +03:00
#ifdef CONFIG_HIBERNATION
ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1))
<= SZ_4K, "Hibernate exit text too big or misaligned")
#endif
arm64: Enable TEXT_OFFSET fuzzing The arm64 Image header contains a text_offset field which bootloaders are supposed to read to determine the offset (from a 2MB aligned "start of memory" per booting.txt) at which to load the kernel. The offset is not well respected by bootloaders at present, and due to the lack of variation there is little incentive to support it. This is unfortunate for the sake of future kernels where we may wish to vary the text offset (even zeroing it). This patch adds options to arm64 to enable fuzz-testing of text_offset. CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET forces the text offset to a random 16-byte aligned value value in the range [0..2MB) upon a build of the kernel. It is recommended that distribution kernels enable randomization to test bootloaders such that any compliance issues can be fixed early. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Tom Rini <trini@ti.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-06-24 19:51:37 +04:00
/*
* If padding is applied before .head.text, virt<->phys conversions will fail.
*/
arm64: introduce KIMAGE_VADDR as the virtual base of the kernel region This introduces the preprocessor symbol KIMAGE_VADDR which will serve as the symbolic virtual base of the kernel region, i.e., the kernel's virtual offset will be KIMAGE_VADDR + TEXT_OFFSET. For now, we define it as being equal to PAGE_OFFSET, but in the future, it will be moved below it once we move the kernel virtual mapping out of the linear mapping. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-02-16 15:52:36 +03:00
ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")