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| author |   Suzuki K Poulose <suzuki.poulose@arm.com> | 2016-09-09 14:07:12 +0100 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2016-09-09 15:03:28 +0100 |
| commit | 46084bc253e1acdd6c47846e91fc20f4ab4f1fec (patch) | |
| tree | 097e051f725f1bbdb6744172b9ad0041e797a92e /arch/arm64/kernel/insn.c | |
| parent | arm64: alternative: Disallow patching instructions using literals (diff) | |
| download | linux-dev-46084bc253e1acdd6c47846e91fc20f4ab4f1fec.tar.xz linux-dev-46084bc253e1acdd6c47846e91fc20f4ab4f1fec.zip | |
arm64: insn: Add helpers for adrp offsets
Adds helpers for decoding/encoding the PC relative addresses for adrp.
This will be used for handling dynamic patching of 'adrp' instructions
in alternative code patching.
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/insn.c')
| -rw-r--r-- | arch/arm64/kernel/insn.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c index 178488fc775f..6f2ac4fc66ca 100644 --- a/arch/arm64/kernel/insn.c +++ b/arch/arm64/kernel/insn.c @@ -1202,6 +1202,19 @@ u32 aarch64_set_branch_offset(u32 insn, s32 offset) BUG(); } +s32 aarch64_insn_adrp_get_offset(u32 insn) +{ + BUG_ON(!aarch64_insn_is_adrp(insn)); + return aarch64_insn_decode_immediate(AARCH64_INSN_IMM_ADR, insn) << 12; +} + +u32 aarch64_insn_adrp_set_offset(u32 insn, s32 offset) +{ + BUG_ON(!aarch64_insn_is_adrp(insn)); + return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_ADR, insn, + offset >> 12); +} + /* * Extract the Op/CR data from a msr/mrs instruction. */ |