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arm64: introduce aarch64_insn_gen_data1()

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

Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Zi Shen Lim 2014-08-27 05:15:26 +01:00 committed by Will Deacon
parent 5fdc639a7a
commit 546dd36b44
2 changed files with 50 additions and 0 deletions
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13
arch/arm64/include/asm/insn.h
View file

@ -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);

37
arch/arm64/kernel/insn.c
View file

@ -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);
}