1. 12 Oct, 2015 1 commit
  2. 17 Sep, 2015 1 commit
    • Will Deacon's avatar
      arm64: errata: add module build workaround for erratum #843419 · df057cc7
      Will Deacon authored
      Cortex-A53 processors <= r0p4 are affected by erratum #843419 which can
      lead to a memory access using an incorrect address in certain sequences
      headed by an ADRP instruction.
      There is a linker fix to generate veneers for ADRP instructions, but
      this doesn't work for kernel modules which are built as unlinked ELF
      This patch adds a new config option for the erratum which, when enabled,
      builds kernel modules with the mcmodel=large flag. This uses absolute
      addressing for all kernel symbols, thereby removing the use of ADRP as
      a PC-relative form of addressing. The ADRP relocs are removed from the
      module loader so that we fail to load any potentially affected modules.
      Cc: <stable@vger.kernel.org>
      Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
  3. 27 Jul, 2015 2 commits
  4. 17 Mar, 2015 1 commit
    • Steve Capper's avatar
      arm64: Adjust EFI libstub object include logic · ad08fd49
      Steve Capper authored
      Commit f4f75ad5 ("efi: efistub: Convert into static library")
      introduced a static library for EFI stub, libstub.
      The EFI libstub directory is referenced by the kernel build system via
      a obj subdirectory rule in:
      Unfortunately, arm64 also references the EFI libstub via:
      libs-$(CONFIG_EFI_STUB) += drivers/firmware/efi/libstub/
      If we're unlucky, the kernel build system can enter libstub via two
      simultaneous threads resulting in build failures such as:
      fixdep: error opening depfile: drivers/firmware/efi/libstub/.efi-stub-helper.o.d: No such file or directory
      scripts/Makefile.build:257: recipe for target 'drivers/firmware/efi/libstub/efi-stub-helper.o' failed
      make[1]: *** [drivers/firmware/efi/libstub/efi-stub-helper.o] Error 2
      Makefile:939: recipe for target 'drivers/firmware/efi/libstub' failed
      make: *** [drivers/firmware/efi/libstub] Error 2
      make: *** Waiting for unfinished jobs....
      This patch adjusts the arm64 Makefile to reference the compiled library
      explicitly (as is currently done in x86), rather than the directory.
      Fixes: f4f75ad5 efi: efistub: Convert into static library
      Signed-off-by: default avatarSteve Capper <steve.capper@linaro.org>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
  5. 20 Jan, 2015 1 commit
  6. 15 Jan, 2015 1 commit
    • Kevin Hao's avatar
      arm64: kill off the libgcc dependency · d67703a8
      Kevin Hao authored
      The arm64 kernel builds fine without the libgcc. Actually it should not
      be used at all in the kernel. The following are the reasons indicated
      by Russell King:
        Although libgcc is part of the compiler, libgcc is built with the
        expectation that it will be running in userland - it expects to link
        to a libc.  That's why you can't build libgcc without having the glibc
        headers around.
        Meanwhile, having the kernel build the compiler support functions that
        it needs ensures that (a) we know what compiler support functions are
        being used, (b) we know the implementation of those support functions
        are sane for use in the kernel, (c) we can build them with appropriate
        compiler flags for best performance, and (d) we remove an unnecessary
        dependency on the build toolchain.
      Signed-off-by: default avatarKevin Hao <haokexin@gmail.com>
      Acked-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
  7. 21 Oct, 2014 3 commits
  8. 02 Oct, 2014 1 commit
  9. 08 Sep, 2014 1 commit
  10. 19 Aug, 2014 1 commit
    • Ard Biesheuvel's avatar
      arm64: align randomized TEXT_OFFSET on 4 kB boundary · 4190312b
      Ard Biesheuvel authored
      When booting via UEFI, the kernel Image is loaded at a 4 kB boundary and
      the embedded EFI stub is executed in place. The EFI stub relocates the
      Image to reside TEXT_OFFSET bytes above a 2 MB boundary, and jumps into
      the kernel proper.
      In AArch64, PC relative symbol references are emitted using adrp/add or
      adrp/ldr pairs, where the offset into a 4 kB page is resolved using a
      separate :lo12: relocation. This implicitly assumes that the code will
      always be executed at the same relative offset with respect to a 4 kB
      boundary, or the references will point to the wrong address.
      This means we should link the kernel at a 4 kB aligned base address in
      order to remain compatible with the base address the UEFI loader uses
      when doing the initial load of Image. So update the code that generates
      TEXT_OFFSET to choose a multiple of 4 kB.
      At the same time, update the code so it chooses from the interval [0..2MB)
      as the author originally intended.
      Reviewed-by: default avatarMark Rutland <mark.rutland@arm.com>
      Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
  11. 18 Jul, 2014 1 commit
    • Ard Biesheuvel's avatar
      efi: efistub: Convert into static library · f4f75ad5
      Ard Biesheuvel authored
      This patch changes both x86 and arm64 efistub implementations
      from #including shared .c files under drivers/firmware/efi to
      building shared code as a static library.
      The x86 code uses a stub built into the boot executable which
      uncompresses the kernel at boot time. In this case, the library is
      linked into the decompressor.
      In the arm64 case, the stub is part of the kernel proper so the library
      is linked into the kernel proper as well.
      Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
  12. 10 Jul, 2014 1 commit
    • Mark Rutland's avatar
      arm64: Enable TEXT_OFFSET fuzzing · da57a369
      Mark Rutland authored
      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: default avatarMark Rutland <mark.rutland@arm.com>
      Acked-by: default avatarTom Rini <trini@ti.com>
      Acked-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
  13. 14 May, 2014 1 commit
  14. 25 Oct, 2013 1 commit
  15. 19 Jun, 2013 1 commit
  16. 12 Jun, 2013 1 commit
  17. 07 Jun, 2013 1 commit
  18. 10 Dec, 2012 1 commit
  19. 03 Dec, 2012 2 commits
  20. 17 Sep, 2012 1 commit