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Subject[PATCH RFCv3 08/14] arm64: introduce aarch64_insn_gen_movewide()
Date
Introduce function to generate move wide (immediate) instructions.

Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
---
arch/arm64/include/asm/insn.h | 13 +++++++++++++
arch/arm64/kernel/insn.c | 43 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+)

diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
index 8fd31fc..49dec28 100644
--- a/arch/arm64/include/asm/insn.h
+++ b/arch/arm64/include/asm/insn.h
@@ -172,6 +172,12 @@ enum aarch64_insn_adsb_type {
AARCH64_INSN_ADSB_SUB_SETFLAGS
};

+enum aarch64_insn_movewide_type {
+ AARCH64_INSN_MOVEWIDE_ZERO,
+ AARCH64_INSN_MOVEWIDE_KEEP,
+ AARCH64_INSN_MOVEWIDE_INVERSE
+};
+
enum aarch64_insn_bitfield_type {
AARCH64_INSN_BITFIELD_MOVE,
AARCH64_INSN_BITFIELD_MOVE_UNSIGNED,
@@ -194,9 +200,12 @@ __AARCH64_INSN_FUNCS(add_imm, 0x7F000000, 0x11000000)
__AARCH64_INSN_FUNCS(adds_imm, 0x7F000000, 0x31000000)
__AARCH64_INSN_FUNCS(sub_imm, 0x7F000000, 0x51000000)
__AARCH64_INSN_FUNCS(subs_imm, 0x7F000000, 0x71000000)
+__AARCH64_INSN_FUNCS(movn, 0x7F800000, 0x12800000)
__AARCH64_INSN_FUNCS(sbfm, 0x7F800000, 0x13000000)
__AARCH64_INSN_FUNCS(bfm, 0x7F800000, 0x33000000)
+__AARCH64_INSN_FUNCS(movz, 0x7F800000, 0x52800000)
__AARCH64_INSN_FUNCS(ubfm, 0x7F800000, 0x53000000)
+__AARCH64_INSN_FUNCS(movk, 0x7F800000, 0x72800000)
__AARCH64_INSN_FUNCS(b, 0xFC000000, 0x14000000)
__AARCH64_INSN_FUNCS(bl, 0xFC000000, 0x94000000)
__AARCH64_INSN_FUNCS(cbz, 0xFE000000, 0x34000000)
@@ -252,6 +261,10 @@ u32 aarch64_insn_gen_bitfield(enum aarch64_insn_register dst,
int immr, int imms,
enum aarch64_insn_variant variant,
enum aarch64_insn_bitfield_type type);
+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);

bool aarch64_insn_hotpatch_safe(u32 old_insn, u32 new_insn);

diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c
index 01ed35c..1cb94b4 100644
--- a/arch/arm64/kernel/insn.c
+++ b/arch/arm64/kernel/insn.c
@@ -653,3 +653,46 @@ 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 < 0 || imm > 65535);
+
+ switch (variant) {
+ case AARCH64_INSN_VARIANT_32BIT:
+ BUG_ON(shift != 0 && shift != 16);
+ break;
+ case AARCH64_INSN_VARIANT_64BIT:
+ insn |= BIT(31);
+ 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);
+}
--
1.9.1


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