diff mbox

arm64: insn: fix compare-and-branch encodings

Message ID 369053df4298c754061e47068834bd9640b0841b.1424273599.git.robin.murphy@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Robin Murphy Feb. 18, 2015, 3:40 p.m. UTC
Fix cbz/cbnz having the mask offset by a bit, and add encodings for
tbz/tbnz so that all branch forms are represented.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
---
 arch/arm64/include/asm/insn.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Robin Murphy Feb. 18, 2015, 4:08 p.m. UTC | #1
Oops, missed some CCs...

On 18/02/15 15:40, Robin Murphy wrote:
> Fix cbz/cbnz having the mask offset by a bit, and add encodings for
> tbz/tbnz so that all branch forms are represented.
>
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
> Acked-by: Will Deacon <will.deacon@arm.com>
> ---
>   arch/arm64/include/asm/insn.h | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
> index e2ff32a..d2f4942 100644
> --- a/arch/arm64/include/asm/insn.h
> +++ b/arch/arm64/include/asm/insn.h
> @@ -264,8 +264,10 @@ __AARCH64_INSN_FUNCS(ands,	0x7F200000, 0x6A000000)
>   __AARCH64_INSN_FUNCS(bics,	0x7F200000, 0x6A200000)
>   __AARCH64_INSN_FUNCS(b,		0xFC000000, 0x14000000)
>   __AARCH64_INSN_FUNCS(bl,	0xFC000000, 0x94000000)
> -__AARCH64_INSN_FUNCS(cbz,	0xFE000000, 0x34000000)
> -__AARCH64_INSN_FUNCS(cbnz,	0xFE000000, 0x35000000)
> +__AARCH64_INSN_FUNCS(cbz,	0x7F000000, 0x34000000)
> +__AARCH64_INSN_FUNCS(cbnz,	0x7F000000, 0x35000000)
> +__AARCH64_INSN_FUNCS(tbz,	0x7F000000, 0x36000000)
> +__AARCH64_INSN_FUNCS(tbnz,	0x7F000000, 0x37000000)
>   __AARCH64_INSN_FUNCS(bcond,	0xFF000010, 0x54000000)
>   __AARCH64_INSN_FUNCS(svc,	0xFFE0001F, 0xD4000001)
>   __AARCH64_INSN_FUNCS(hvc,	0xFFE0001F, 0xD4000002)
>
Zi Shen Lim Feb. 19, 2015, 7:33 p.m. UTC | #2
On Wed, Feb 18, 2015 at 8:08 AM, Robin Murphy <robin.murphy@arm.com> wrote:
> Oops, missed some CCs...
>
> On 18/02/15 15:40, Robin Murphy wrote:
>>
>> Fix cbz/cbnz having the mask offset by a bit, and add encodings for
>> tbz/tbnz so that all branch forms are represented.
>>
>> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
>> Acked-by: Will Deacon <will.deacon@arm.com>
>> ---
>>   arch/arm64/include/asm/insn.h | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
>> index e2ff32a..d2f4942 100644
>> --- a/arch/arm64/include/asm/insn.h
>> +++ b/arch/arm64/include/asm/insn.h
>> @@ -264,8 +264,10 @@ __AARCH64_INSN_FUNCS(ands, 0x7F200000, 0x6A000000)
>>   __AARCH64_INSN_FUNCS(bics,    0x7F200000, 0x6A200000)
>>   __AARCH64_INSN_FUNCS(b,               0xFC000000, 0x14000000)
>>   __AARCH64_INSN_FUNCS(bl,      0xFC000000, 0x94000000)
>> -__AARCH64_INSN_FUNCS(cbz,      0xFE000000, 0x34000000)
>> -__AARCH64_INSN_FUNCS(cbnz,     0xFE000000, 0x35000000)
>> +__AARCH64_INSN_FUNCS(cbz,      0x7F000000, 0x34000000)
>> +__AARCH64_INSN_FUNCS(cbnz,     0x7F000000, 0x35000000)
>> +__AARCH64_INSN_FUNCS(tbz,      0x7F000000, 0x36000000)
>> +__AARCH64_INSN_FUNCS(tbnz,     0x7F000000, 0x37000000)
>>   __AARCH64_INSN_FUNCS(bcond,   0xFF000010, 0x54000000)
>>   __AARCH64_INSN_FUNCS(svc,     0xFFE0001F, 0xD4000001)
>>   __AARCH64_INSN_FUNCS(hvc,     0xFFE0001F, 0xD4000002)
>>

Looks good to me, as described in ARMv8 ARM.

Acked-by: Zi Shen Lim <zlim.lnx@gmail.com>
diff mbox

Patch

diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
index e2ff32a..d2f4942 100644
--- a/arch/arm64/include/asm/insn.h
+++ b/arch/arm64/include/asm/insn.h
@@ -264,8 +264,10 @@  __AARCH64_INSN_FUNCS(ands,	0x7F200000, 0x6A000000)
 __AARCH64_INSN_FUNCS(bics,	0x7F200000, 0x6A200000)
 __AARCH64_INSN_FUNCS(b,		0xFC000000, 0x14000000)
 __AARCH64_INSN_FUNCS(bl,	0xFC000000, 0x94000000)
-__AARCH64_INSN_FUNCS(cbz,	0xFE000000, 0x34000000)
-__AARCH64_INSN_FUNCS(cbnz,	0xFE000000, 0x35000000)
+__AARCH64_INSN_FUNCS(cbz,	0x7F000000, 0x34000000)
+__AARCH64_INSN_FUNCS(cbnz,	0x7F000000, 0x35000000)
+__AARCH64_INSN_FUNCS(tbz,	0x7F000000, 0x36000000)
+__AARCH64_INSN_FUNCS(tbnz,	0x7F000000, 0x37000000)
 __AARCH64_INSN_FUNCS(bcond,	0xFF000010, 0x54000000)
 __AARCH64_INSN_FUNCS(svc,	0xFFE0001F, 0xD4000001)
 __AARCH64_INSN_FUNCS(hvc,	0xFFE0001F, 0xD4000002)