diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2020-12-07 18:10:34 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-11 13:36:45 +0100 |
| commit | 51a5438ce68c16d1f97fc4da9aa0d875ea0bbe37 (patch) | |
| tree | f8ef425512bc4178a7ee22bf03d3aade40599834 /arch/arm64/kernel/head.S | |
| parent | 735f3adc2b4b75cf8e6c554759346edf772939fd (diff) | |
arm64: assembler: make adr_l work in modules under KASLR
commit 41c066f2c4d436c535616fe182331766c57838f0 upstream
When CONFIG_RANDOMIZE_MODULE_REGION_FULL=y, the offset between loaded
modules and the core kernel may exceed 4 GB, putting symbols exported
by the core kernel out of the reach of the ordinary adrp/add instruction
pairs used to generate relative symbol references. So make the adr_l
macro emit a movz/movk sequence instead when executing in module context.
While at it, remove the pointless special case for the stack pointer.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
[ dannf: backported to v4.4 by replacing the 3-arg adr_l macro in head.S
with it's output, as this commit drops the 3-arg variant ]
Fixes: c042dd600f4e ("crypto: arm64/sha - avoid non-standard inline asm tricks")
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64/kernel/head.S')
| -rw-r--r-- | arch/arm64/kernel/head.S | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 6299a8a361ee..504bcc3a852f 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -424,7 +424,8 @@ __mmap_switched: str xzr, [x6], #8 // Clear BSS b 1b 2: - adr_l sp, initial_sp, x4 + adrp x4, initial_sp + add sp, x4, :lo12:initial_sp str_l x21, __fdt_pointer, x5 // Save FDT pointer str_l x24, memstart_addr, x6 // Save PHYS_OFFSET mov x29, #0 |