aboutsummaryrefslogtreecommitdiff
path: root/arch/arm64/kernel
diff options
context:
space:
mode:
authorZi Shen Lim2014-08-27 05:15:24 +0100
committerWill Deacon2014-09-08 14:39:20 +0100
commit6098f2d5c7a349d388499503bb129d0088870dd6 (patch)
tree70ff3f52dd09dd02ca5768e113a5ee24795b314c /arch/arm64/kernel
parent4a89d2c98e1efadd135015668c499ae1bbd2131f (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.c43
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);
+}