Commit 546dd36b authored by Zi Shen Lim's avatar Zi Shen Lim Committed by Will Deacon
Browse files

arm64: introduce aarch64_insn_gen_data1() 



Introduce function to generate data-processing (1 source) instructions.

Signed-off-by: default avatarZi Shen Lim <zlim.lnx@gmail.com>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 5fdc639a

arch/arm64/include/asm/insn.h

+13 −0
Original line number Diff line number Diff line
@@ -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);

arch/arm64/kernel/insn.c

+37 −0
Original line number Diff line number Diff line
@@ -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);

}