diff options
| author | Zi Shen Lim <zlim.lnx@gmail.com> | 2014-08-27 05:15:24 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2014-09-08 14:39:20 +0100 |
| commit | 6098f2d5c7a349d388499503bb129d0088870dd6 (patch) | |
| tree | 70ff3f52dd09dd02ca5768e113a5ee24795b314c /arch/arm64/kernel | |
| parent | 4a89d2c98e1efadd135015668c499ae1bbd2131f (diff) | |
arm64: introduce aarch64_insn_gen_movewide()
Introduce function to generate move wide (immediate) instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/insn.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c index e07d026e75d8..7aa278404b80 100644 --- a/arch/arm64/kernel/insn.c +++ b/arch/arm64/kernel/insn.c @@ -655,3 +655,46 @@ u32 aarch64_insn_gen_bitfield(enum aarch64_insn_register dst, return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_S, insn, imms); } + +u32 aarch64_insn_gen_movewide(enum aarch64_insn_register dst, + int imm, int shift, + enum aarch64_insn_variant variant, + enum aarch64_insn_movewide_type type) +{ + u32 insn; + + switch (type) { + case AARCH64_INSN_MOVEWIDE_ZERO: + insn = aarch64_insn_get_movz_value(); + break; + case AARCH64_INSN_MOVEWIDE_KEEP: + insn = aarch64_insn_get_movk_value(); + break; + case AARCH64_INSN_MOVEWIDE_INVERSE: + insn = aarch64_insn_get_movn_value(); + break; + default: + BUG_ON(1); + } + + BUG_ON(imm & ~(SZ_64K - 1)); + + switch (variant) { + case AARCH64_INSN_VARIANT_32BIT: + BUG_ON(shift != 0 && shift != 16); + break; + case AARCH64_INSN_VARIANT_64BIT: + insn |= AARCH64_INSN_SF_BIT; + BUG_ON(shift != 0 && shift != 16 && shift != 32 && + shift != 48); + break; + default: + BUG_ON(1); + } + + insn |= (shift >> 4) << 21; + + insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); + + return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_16, insn, imm); +} |