[PATCH RFCv3 12/14] arm64: introduce aarch64_insn_gen_data3()

From: Zi Shen Lim
Date: Tue Jul 15 2014 - 02:30:04 EST


Introduce function to generate data-processing (3 source) instructions.

Signed-off-by: Zi Shen Lim <zlim.lnx@xxxxxxxxx>
---
arch/arm64/include/asm/insn.h | 14 ++++++++++++++
arch/arm64/kernel/insn.c | 42 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+)

diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
index 367245f..36e8465 100644
--- a/arch/arm64/include/asm/insn.h
+++ b/arch/arm64/include/asm/insn.h
@@ -79,6 +79,7 @@ enum aarch64_insn_register_type {
AARCH64_INSN_REGTYPE_RT2,
AARCH64_INSN_REGTYPE_RM,
AARCH64_INSN_REGTYPE_RD,
+ AARCH64_INSN_REGTYPE_RA,
};

enum aarch64_insn_register {
@@ -200,6 +201,11 @@ enum aarch64_insn_data2_type {
AARCH64_INSN_DATA2_RORV,
};

+enum aarch64_insn_data3_type {
+ AARCH64_INSN_DATA3_MADD,
+ AARCH64_INSN_DATA3_MSUB,
+};
+
#define __AARCH64_INSN_FUNCS(abbr, mask, val) \
static __always_inline bool aarch64_insn_is_##abbr(u32 code) \
{ return (code & (mask)) == (val); } \
@@ -226,6 +232,8 @@ __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(madd, 0x7FE08000, 0x1B000000)
+__AARCH64_INSN_FUNCS(msub, 0x7FE08000, 0x1B008000)
__AARCH64_INSN_FUNCS(udiv, 0x7FE0FC00, 0x1AC00800)
__AARCH64_INSN_FUNCS(sdiv, 0x7FE0FC00, 0x1AC00C00)
__AARCH64_INSN_FUNCS(lslv, 0x7FE0FC00, 0x1AC02000)
@@ -309,6 +317,12 @@ u32 aarch64_insn_gen_data2(enum aarch64_insn_register dst,
enum aarch64_insn_register reg,
enum aarch64_insn_variant variant,
enum aarch64_insn_data2_type type);
+u32 aarch64_insn_gen_data3(enum aarch64_insn_register dst,
+ enum aarch64_insn_register src,
+ enum aarch64_insn_register reg1,
+ enum aarch64_insn_register reg2,
+ enum aarch64_insn_variant variant,
+ enum aarch64_insn_data3_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 7778b18..01664e3 100644
--- a/arch/arm64/kernel/insn.c
+++ b/arch/arm64/kernel/insn.c
@@ -299,6 +299,7 @@ static u32 aarch64_insn_encode_register(enum aarch64_insn_register_type type,
shift = 5;
break;
case AARCH64_INSN_REGTYPE_RT2:
+ case AARCH64_INSN_REGTYPE_RA:
shift = 10;
break;
case AARCH64_INSN_REGTYPE_RM:
@@ -830,3 +831,44 @@ u32 aarch64_insn_gen_data2(enum aarch64_insn_register dst,

return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, reg);
}
+
+u32 aarch64_insn_gen_data3(enum aarch64_insn_register dst,
+ enum aarch64_insn_register src,
+ enum aarch64_insn_register reg1,
+ enum aarch64_insn_register reg2,
+ enum aarch64_insn_variant variant,
+ enum aarch64_insn_data3_type type)
+{
+ u32 insn;
+
+ switch (type) {
+ case AARCH64_INSN_DATA3_MADD:
+ insn = aarch64_insn_get_madd_value();
+ break;
+ case AARCH64_INSN_DATA3_MSUB:
+ insn = aarch64_insn_get_msub_value();
+ break;
+ default:
+ BUG_ON(1);
+ }
+
+ switch (variant) {
+ case AARCH64_INSN_VARIANT_32BIT:
+ break;
+ case AARCH64_INSN_VARIANT_64BIT:
+ insn |= BIT(31);
+ break;
+ default:
+ BUG_ON(1);
+ }
+
+ insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst);
+
+ insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RA, insn, src);
+
+ insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn,
+ reg1);
+
+ return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn,
+ reg2);
+}
--
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/