Commit 6098f2d5 authored by Zi Shen Lim's avatar Zi Shen Lim Committed by Will Deacon
Browse files

arm64: introduce aarch64_insn_gen_movewide() 



Introduce function to generate move wide (immediate) 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 4a89d2c9

arch/arm64/include/asm/insn.h

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

arch/arm64/kernel/insn.c

+43 −0
Original line number Diff line number Diff line
@@ -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);

}