Introduce function to generate data-processing (1 source) instructions.
Signed-off-by: Zi Shen Lim <zlim....@gmail.com>
Acked-by: Will Deacon <will.dea...@arm.com>
---
arch/arm64/include/asm/insn.h | 13 +++++++++++++
arch/arm64/kernel/insn.c | 37 +++++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+)
diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
index c0a765d..246d214 100644
--- a/arch/arm64/include/asm/insn.h
+++ b/arch/arm64/include/asm/insn.h
@@ -185,6 +185,12 @@ enum aarch64_insn_bitfield_type {
AARCH64_INSN_BITFIELD_MOVE_SIGNED
};
+enum aarch64_insn_data1_type {
+ AARCH64_INSN_DATA1_REVERSE_16,
+ AARCH64_INSN_DATA1_REVERSE_32,
+ AARCH64_INSN_DATA1_REVERSE_64,
+};
+
#define __AARCH64_INSN_FUNCS(abbr, mask, val) \
static __always_inline bool aarch64_insn_is_##abbr(u32 code) \
{ return (code & (mask)) == (val); } \
@@ -211,6 +217,9 @@ __AARCH64_INSN_FUNCS(add, 0x7F200000, 0x0B000000)
__AARCH64_INSN_FUNCS(adds, 0x7F200000, 0x2B000000)
__AARCH64_INSN_FUNCS(sub, 0x7F200000, 0x4B000000)
__AARCH64_INSN_FUNCS(subs, 0x7F200000, 0x6B000000)
+__AARCH64_INSN_FUNCS(rev16, 0x7FFFFC00, 0x5AC00400)
+__AARCH64_INSN_FUNCS(rev32, 0x7FFFFC00, 0x5AC00800)
+__AARCH64_INSN_FUNCS(rev64, 0x7FFFFC00, 0x5AC00C00)
__AARCH64_INSN_FUNCS(b, 0xFC000000, 0x14000000)
__AARCH64_INSN_FUNCS(bl, 0xFC000000, 0x94000000)
__AARCH64_INSN_FUNCS(cbz, 0xFE000000, 0x34000000)
@@ -276,6 +285,10 @@ u32 aarch64_insn_gen_add_sub_shifted_reg(enum
aarch64_insn_register dst,
int shift,
enum aarch64_insn_variant variant,
enum aarch64_insn_adsb_type type);
+u32 aarch64_insn_gen_data1(enum aarch64_insn_register dst,
+ enum aarch64_insn_register src,
+ enum aarch64_insn_variant variant,
+ enum aarch64_insn_data1_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 d7a4dd4..81ef3b5 100644
--- a/arch/arm64/kernel/insn.c
+++ b/arch/arm64/kernel/insn.c
@@ -747,3 +747,40 @@ u32 aarch64_insn_gen_add_sub_shifted_reg(enum
aarch64_insn_register dst,
return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_6, insn, shift);
}
+
+u32 aarch64_insn_gen_data1(enum aarch64_insn_register dst,
+ enum aarch64_insn_register src,
+ enum aarch64_insn_variant variant,
+ enum aarch64_insn_data1_type type)
+{
+ u32 insn;
+
+ switch (type) {
+ case AARCH64_INSN_DATA1_REVERSE_16:
+ insn = aarch64_insn_get_rev16_value();
+ break;
+ case AARCH64_INSN_DATA1_REVERSE_32:
+ insn = aarch64_insn_get_rev32_value();
+ break;
+ case AARCH64_INSN_DATA1_REVERSE_64:
+ BUG_ON(variant != AARCH64_INSN_VARIANT_64BIT);
+ insn = aarch64_insn_get_rev64_value();
+ break;
+ default:
+ BUG_ON(1);
+ }
+
+ switch (variant) {
+ case AARCH64_INSN_VARIANT_32BIT:
+ break;
+ case AARCH64_INSN_VARIANT_64BIT:
+ insn |= AARCH64_INSN_SF_BIT;
+ break;
+ default:
+ BUG_ON(1);
+ }
+
+ insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
+
+ return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src);
+}
--
1.9.1
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