All of lore.kernel.org
 help / color / mirror / Atom feed
* [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c
@ 2020-10-06 16:33 ` Jeremy Linton
  0 siblings, 0 replies; 9+ messages in thread
From: Jeremy Linton @ 2020-10-06 16:33 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: linux-crypto, broonie, ardb, will, catalin.marinas, davem,
	herbert, linux-kernel, dave.martin, Jeremy Linton

The AES code uses a 'br x7' as part of a function called by
a macro. That branch needs a bti_j as a target. This results
in a panic as seen below. Using x16 (or x17) with an indirect
branch keeps the target bti_c.

  Bad mode in Synchronous Abort handler detected on CPU1, code 0x34000003 -- BTI
  CPU: 1 PID: 265 Comm: cryptomgr_test Not tainted 5.8.11-300.fc33.aarch64 #1
  pstate: 20400c05 (nzCv daif +PAN -UAO BTYPE=j-)
  pc : aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
  lr : aesbs_xts_encrypt+0x48/0xe0 [aes_neon_bs]
  sp : ffff80001052b730

  aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
   __xts_crypt+0xb0/0x2dc [aes_neon_bs]
   xts_encrypt+0x28/0x3c [aes_neon_bs]
  crypto_skcipher_encrypt+0x50/0x84
  simd_skcipher_encrypt+0xc8/0xe0
  crypto_skcipher_encrypt+0x50/0x84
  test_skcipher_vec_cfg+0x224/0x5f0
  test_skcipher+0xbc/0x120
  alg_test_skcipher+0xa0/0x1b0
  alg_test+0x3dc/0x47c
  cryptomgr_test+0x38/0x60

Fixes: 0e89640b640d ("crypto: arm64 - Use modern annotations for assembly functions")
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
 arch/arm64/crypto/aes-neonbs-core.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/crypto/aes-neonbs-core.S b/arch/arm64/crypto/aes-neonbs-core.S
index b357164379f6..63a52ad9a75c 100644
--- a/arch/arm64/crypto/aes-neonbs-core.S
+++ b/arch/arm64/crypto/aes-neonbs-core.S
@@ -788,7 +788,7 @@ SYM_FUNC_START_LOCAL(__xts_crypt8)
 
 0:	mov		bskey, x21
 	mov		rounds, x22
-	br		x7
+	br		x16
 SYM_FUNC_END(__xts_crypt8)
 
 	.macro		__xts_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7
@@ -806,7 +806,7 @@ SYM_FUNC_END(__xts_crypt8)
 	uzp1		v30.4s, v30.4s, v25.4s
 	ld1		{v25.16b}, [x24]
 
-99:	adr		x7, \do8
+99:	adr		x16, \do8
 	bl		__xts_crypt8
 
 	ldp		q16, q17, [sp, #.Lframe_local_offset]
-- 
2.25.4


^ permalink raw reply related	[flat|nested] 9+ messages in thread

* [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c
@ 2020-10-06 16:33 ` Jeremy Linton
  0 siblings, 0 replies; 9+ messages in thread
From: Jeremy Linton @ 2020-10-06 16:33 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: herbert, catalin.marinas, linux-kernel, Jeremy Linton, ardb,
	broonie, linux-crypto, will, davem, dave.martin

The AES code uses a 'br x7' as part of a function called by
a macro. That branch needs a bti_j as a target. This results
in a panic as seen below. Using x16 (or x17) with an indirect
branch keeps the target bti_c.

  Bad mode in Synchronous Abort handler detected on CPU1, code 0x34000003 -- BTI
  CPU: 1 PID: 265 Comm: cryptomgr_test Not tainted 5.8.11-300.fc33.aarch64 #1
  pstate: 20400c05 (nzCv daif +PAN -UAO BTYPE=j-)
  pc : aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
  lr : aesbs_xts_encrypt+0x48/0xe0 [aes_neon_bs]
  sp : ffff80001052b730

  aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
   __xts_crypt+0xb0/0x2dc [aes_neon_bs]
   xts_encrypt+0x28/0x3c [aes_neon_bs]
  crypto_skcipher_encrypt+0x50/0x84
  simd_skcipher_encrypt+0xc8/0xe0
  crypto_skcipher_encrypt+0x50/0x84
  test_skcipher_vec_cfg+0x224/0x5f0
  test_skcipher+0xbc/0x120
  alg_test_skcipher+0xa0/0x1b0
  alg_test+0x3dc/0x47c
  cryptomgr_test+0x38/0x60

Fixes: 0e89640b640d ("crypto: arm64 - Use modern annotations for assembly functions")
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
 arch/arm64/crypto/aes-neonbs-core.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/crypto/aes-neonbs-core.S b/arch/arm64/crypto/aes-neonbs-core.S
index b357164379f6..63a52ad9a75c 100644
--- a/arch/arm64/crypto/aes-neonbs-core.S
+++ b/arch/arm64/crypto/aes-neonbs-core.S
@@ -788,7 +788,7 @@ SYM_FUNC_START_LOCAL(__xts_crypt8)
 
 0:	mov		bskey, x21
 	mov		rounds, x22
-	br		x7
+	br		x16
 SYM_FUNC_END(__xts_crypt8)
 
 	.macro		__xts_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7
@@ -806,7 +806,7 @@ SYM_FUNC_END(__xts_crypt8)
 	uzp1		v30.4s, v30.4s, v25.4s
 	ld1		{v25.16b}, [x24]
 
-99:	adr		x7, \do8
+99:	adr		x16, \do8
 	bl		__xts_crypt8
 
 	ldp		q16, q17, [sp, #.Lframe_local_offset]
-- 
2.25.4


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 9+ messages in thread

* Re: [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c
  2020-10-06 16:33 ` Jeremy Linton
@ 2020-10-06 16:34   ` Ard Biesheuvel
  -1 siblings, 0 replies; 9+ messages in thread
From: Ard Biesheuvel @ 2020-10-06 16:34 UTC (permalink / raw)
  To: Jeremy Linton
  Cc: Linux ARM, Linux Crypto Mailing List, Mark Brown, Will Deacon,
	Catalin Marinas, David S. Miller, Herbert Xu,
	Linux Kernel Mailing List, Dave Martin

On Tue, 6 Oct 2020 at 18:33, Jeremy Linton <jeremy.linton@arm.com> wrote:
>
> The AES code uses a 'br x7' as part of a function called by
> a macro. That branch needs a bti_j as a target. This results
> in a panic as seen below. Using x16 (or x17) with an indirect
> branch keeps the target bti_c.
>
>   Bad mode in Synchronous Abort handler detected on CPU1, code 0x34000003 -- BTI
>   CPU: 1 PID: 265 Comm: cryptomgr_test Not tainted 5.8.11-300.fc33.aarch64 #1
>   pstate: 20400c05 (nzCv daif +PAN -UAO BTYPE=j-)
>   pc : aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
>   lr : aesbs_xts_encrypt+0x48/0xe0 [aes_neon_bs]
>   sp : ffff80001052b730
>
>   aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
>    __xts_crypt+0xb0/0x2dc [aes_neon_bs]
>    xts_encrypt+0x28/0x3c [aes_neon_bs]
>   crypto_skcipher_encrypt+0x50/0x84
>   simd_skcipher_encrypt+0xc8/0xe0
>   crypto_skcipher_encrypt+0x50/0x84
>   test_skcipher_vec_cfg+0x224/0x5f0
>   test_skcipher+0xbc/0x120
>   alg_test_skcipher+0xa0/0x1b0
>   alg_test+0x3dc/0x47c
>   cryptomgr_test+0x38/0x60
>
> Fixes: 0e89640b640d ("crypto: arm64 - Use modern annotations for assembly functions")
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

> ---
>  arch/arm64/crypto/aes-neonbs-core.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/crypto/aes-neonbs-core.S b/arch/arm64/crypto/aes-neonbs-core.S
> index b357164379f6..63a52ad9a75c 100644
> --- a/arch/arm64/crypto/aes-neonbs-core.S
> +++ b/arch/arm64/crypto/aes-neonbs-core.S
> @@ -788,7 +788,7 @@ SYM_FUNC_START_LOCAL(__xts_crypt8)
>
>  0:     mov             bskey, x21
>         mov             rounds, x22
> -       br              x7
> +       br              x16
>  SYM_FUNC_END(__xts_crypt8)
>
>         .macro          __xts_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7
> @@ -806,7 +806,7 @@ SYM_FUNC_END(__xts_crypt8)
>         uzp1            v30.4s, v30.4s, v25.4s
>         ld1             {v25.16b}, [x24]
>
> -99:    adr             x7, \do8
> +99:    adr             x16, \do8
>         bl              __xts_crypt8
>
>         ldp             q16, q17, [sp, #.Lframe_local_offset]
> --
> 2.25.4
>

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c
@ 2020-10-06 16:34   ` Ard Biesheuvel
  0 siblings, 0 replies; 9+ messages in thread
From: Ard Biesheuvel @ 2020-10-06 16:34 UTC (permalink / raw)
  To: Jeremy Linton
  Cc: Herbert Xu, Catalin Marinas, Linux Kernel Mailing List,
	Dave Martin, Mark Brown, Linux Crypto Mailing List, Will Deacon,
	David S. Miller, Linux ARM

On Tue, 6 Oct 2020 at 18:33, Jeremy Linton <jeremy.linton@arm.com> wrote:
>
> The AES code uses a 'br x7' as part of a function called by
> a macro. That branch needs a bti_j as a target. This results
> in a panic as seen below. Using x16 (or x17) with an indirect
> branch keeps the target bti_c.
>
>   Bad mode in Synchronous Abort handler detected on CPU1, code 0x34000003 -- BTI
>   CPU: 1 PID: 265 Comm: cryptomgr_test Not tainted 5.8.11-300.fc33.aarch64 #1
>   pstate: 20400c05 (nzCv daif +PAN -UAO BTYPE=j-)
>   pc : aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
>   lr : aesbs_xts_encrypt+0x48/0xe0 [aes_neon_bs]
>   sp : ffff80001052b730
>
>   aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
>    __xts_crypt+0xb0/0x2dc [aes_neon_bs]
>    xts_encrypt+0x28/0x3c [aes_neon_bs]
>   crypto_skcipher_encrypt+0x50/0x84
>   simd_skcipher_encrypt+0xc8/0xe0
>   crypto_skcipher_encrypt+0x50/0x84
>   test_skcipher_vec_cfg+0x224/0x5f0
>   test_skcipher+0xbc/0x120
>   alg_test_skcipher+0xa0/0x1b0
>   alg_test+0x3dc/0x47c
>   cryptomgr_test+0x38/0x60
>
> Fixes: 0e89640b640d ("crypto: arm64 - Use modern annotations for assembly functions")
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

> ---
>  arch/arm64/crypto/aes-neonbs-core.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/crypto/aes-neonbs-core.S b/arch/arm64/crypto/aes-neonbs-core.S
> index b357164379f6..63a52ad9a75c 100644
> --- a/arch/arm64/crypto/aes-neonbs-core.S
> +++ b/arch/arm64/crypto/aes-neonbs-core.S
> @@ -788,7 +788,7 @@ SYM_FUNC_START_LOCAL(__xts_crypt8)
>
>  0:     mov             bskey, x21
>         mov             rounds, x22
> -       br              x7
> +       br              x16
>  SYM_FUNC_END(__xts_crypt8)
>
>         .macro          __xts_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7
> @@ -806,7 +806,7 @@ SYM_FUNC_END(__xts_crypt8)
>         uzp1            v30.4s, v30.4s, v25.4s
>         ld1             {v25.16b}, [x24]
>
> -99:    adr             x7, \do8
> +99:    adr             x16, \do8
>         bl              __xts_crypt8
>
>         ldp             q16, q17, [sp, #.Lframe_local_offset]
> --
> 2.25.4
>

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c
  2020-10-06 16:33 ` Jeremy Linton
@ 2020-10-06 16:39   ` Mark Brown
  -1 siblings, 0 replies; 9+ messages in thread
From: Mark Brown @ 2020-10-06 16:39 UTC (permalink / raw)
  To: Jeremy Linton
  Cc: linux-arm-kernel, linux-crypto, ardb, will, catalin.marinas,
	davem, herbert, linux-kernel, dave.martin

[-- Attachment #1: Type: text/plain, Size: 331 bytes --]

On Tue, Oct 06, 2020 at 11:33:26AM -0500, Jeremy Linton wrote:
> The AES code uses a 'br x7' as part of a function called by
> a macro. That branch needs a bti_j as a target. This results
> in a panic as seen below. Using x16 (or x17) with an indirect
> branch keeps the target bti_c.

Reviewed-by: Mark Brown <broonie@kernel.org>

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c
@ 2020-10-06 16:39   ` Mark Brown
  0 siblings, 0 replies; 9+ messages in thread
From: Mark Brown @ 2020-10-06 16:39 UTC (permalink / raw)
  To: Jeremy Linton
  Cc: herbert, catalin.marinas, linux-kernel, ardb, linux-crypto, will,
	davem, linux-arm-kernel, dave.martin


[-- Attachment #1.1: Type: text/plain, Size: 331 bytes --]

On Tue, Oct 06, 2020 at 11:33:26AM -0500, Jeremy Linton wrote:
> The AES code uses a 'br x7' as part of a function called by
> a macro. That branch needs a bti_j as a target. This results
> in a panic as seen below. Using x16 (or x17) with an indirect
> branch keeps the target bti_c.

Reviewed-by: Mark Brown <broonie@kernel.org>

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

[-- Attachment #2: Type: text/plain, Size: 176 bytes --]

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c
  2020-10-06 16:33 ` Jeremy Linton
                   ` (2 preceding siblings ...)
  (?)
@ 2020-10-06 17:31 ` Catalin Marinas
  -1 siblings, 0 replies; 9+ messages in thread
From: Catalin Marinas @ 2020-10-06 17:31 UTC (permalink / raw)
  To: linux-arm-kernel, Jeremy Linton
  Cc: Will Deacon, davem, herbert, linux-kernel, dave.martin, ardb,
	linux-crypto, broonie

On Tue, 6 Oct 2020 11:33:26 -0500, Jeremy Linton wrote:
> The AES code uses a 'br x7' as part of a function called by
> a macro. That branch needs a bti_j as a target. This results
> in a panic as seen below. Using x16 (or x17) with an indirect
> branch keeps the target bti_c.
> 
>   Bad mode in Synchronous Abort handler detected on CPU1, code 0x34000003 -- BTI
>   CPU: 1 PID: 265 Comm: cryptomgr_test Not tainted 5.8.11-300.fc33.aarch64 #1
>   pstate: 20400c05 (nzCv daif +PAN -UAO BTYPE=j-)
>   pc : aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
>   lr : aesbs_xts_encrypt+0x48/0xe0 [aes_neon_bs]
>   sp : ffff80001052b730
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] crypto: arm64: Use x16 with indirect branch to bti_c
      https://git.kernel.org/arm64/c/39e4716caa59

-- 
Catalin


^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c
  2020-10-06 16:33 ` Jeremy Linton
@ 2020-10-07  8:49   ` Dave Martin
  -1 siblings, 0 replies; 9+ messages in thread
From: Dave Martin @ 2020-10-07  8:49 UTC (permalink / raw)
  To: Jeremy Linton
  Cc: linux-arm-kernel, herbert, catalin.marinas, linux-kernel, ardb,
	broonie, linux-crypto, will, davem

On Tue, Oct 06, 2020 at 11:33:26AM -0500, Jeremy Linton wrote:
> The AES code uses a 'br x7' as part of a function called by
> a macro. That branch needs a bti_j as a target. This results
> in a panic as seen below. Using x16 (or x17) with an indirect
> branch keeps the target bti_c.
> 
>   Bad mode in Synchronous Abort handler detected on CPU1, code 0x34000003 -- BTI
>   CPU: 1 PID: 265 Comm: cryptomgr_test Not tainted 5.8.11-300.fc33.aarch64 #1
>   pstate: 20400c05 (nzCv daif +PAN -UAO BTYPE=j-)
>   pc : aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
>   lr : aesbs_xts_encrypt+0x48/0xe0 [aes_neon_bs]
>   sp : ffff80001052b730
> 
>   aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
>    __xts_crypt+0xb0/0x2dc [aes_neon_bs]
>    xts_encrypt+0x28/0x3c [aes_neon_bs]
>   crypto_skcipher_encrypt+0x50/0x84
>   simd_skcipher_encrypt+0xc8/0xe0
>   crypto_skcipher_encrypt+0x50/0x84
>   test_skcipher_vec_cfg+0x224/0x5f0
>   test_skcipher+0xbc/0x120
>   alg_test_skcipher+0xa0/0x1b0
>   alg_test+0x3dc/0x47c
>   cryptomgr_test+0x38/0x60
> 
> Fixes: 0e89640b640d ("crypto: arm64 - Use modern annotations for assembly functions")
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>

Reviewed-by: Dave Martin <Dave.Martin@arm.com>

Note, if we ended up with any veneered function calls in the mix while
x16 is live, this register could get clobbered.

Given the self-contained nature of this code though, it seems highly
unlikely that we will ever have multiple code sections of external calls
here.

Cheers
---Dave

> ---
>  arch/arm64/crypto/aes-neonbs-core.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/crypto/aes-neonbs-core.S b/arch/arm64/crypto/aes-neonbs-core.S
> index b357164379f6..63a52ad9a75c 100644
> --- a/arch/arm64/crypto/aes-neonbs-core.S
> +++ b/arch/arm64/crypto/aes-neonbs-core.S
> @@ -788,7 +788,7 @@ SYM_FUNC_START_LOCAL(__xts_crypt8)
>  
>  0:	mov		bskey, x21
>  	mov		rounds, x22
> -	br		x7
> +	br		x16
>  SYM_FUNC_END(__xts_crypt8)
>  
>  	.macro		__xts_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7
> @@ -806,7 +806,7 @@ SYM_FUNC_END(__xts_crypt8)
>  	uzp1		v30.4s, v30.4s, v25.4s
>  	ld1		{v25.16b}, [x24]
>  
> -99:	adr		x7, \do8
> +99:	adr		x16, \do8
>  	bl		__xts_crypt8
>  
>  	ldp		q16, q17, [sp, #.Lframe_local_offset]
> -- 
> 2.25.4
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c
@ 2020-10-07  8:49   ` Dave Martin
  0 siblings, 0 replies; 9+ messages in thread
From: Dave Martin @ 2020-10-07  8:49 UTC (permalink / raw)
  To: Jeremy Linton
  Cc: herbert, catalin.marinas, linux-kernel, davem, broonie,
	linux-crypto, will, ardb, linux-arm-kernel

On Tue, Oct 06, 2020 at 11:33:26AM -0500, Jeremy Linton wrote:
> The AES code uses a 'br x7' as part of a function called by
> a macro. That branch needs a bti_j as a target. This results
> in a panic as seen below. Using x16 (or x17) with an indirect
> branch keeps the target bti_c.
> 
>   Bad mode in Synchronous Abort handler detected on CPU1, code 0x34000003 -- BTI
>   CPU: 1 PID: 265 Comm: cryptomgr_test Not tainted 5.8.11-300.fc33.aarch64 #1
>   pstate: 20400c05 (nzCv daif +PAN -UAO BTYPE=j-)
>   pc : aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
>   lr : aesbs_xts_encrypt+0x48/0xe0 [aes_neon_bs]
>   sp : ffff80001052b730
> 
>   aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs]
>    __xts_crypt+0xb0/0x2dc [aes_neon_bs]
>    xts_encrypt+0x28/0x3c [aes_neon_bs]
>   crypto_skcipher_encrypt+0x50/0x84
>   simd_skcipher_encrypt+0xc8/0xe0
>   crypto_skcipher_encrypt+0x50/0x84
>   test_skcipher_vec_cfg+0x224/0x5f0
>   test_skcipher+0xbc/0x120
>   alg_test_skcipher+0xa0/0x1b0
>   alg_test+0x3dc/0x47c
>   cryptomgr_test+0x38/0x60
> 
> Fixes: 0e89640b640d ("crypto: arm64 - Use modern annotations for assembly functions")
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>

Reviewed-by: Dave Martin <Dave.Martin@arm.com>

Note, if we ended up with any veneered function calls in the mix while
x16 is live, this register could get clobbered.

Given the self-contained nature of this code though, it seems highly
unlikely that we will ever have multiple code sections of external calls
here.

Cheers
---Dave

> ---
>  arch/arm64/crypto/aes-neonbs-core.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/crypto/aes-neonbs-core.S b/arch/arm64/crypto/aes-neonbs-core.S
> index b357164379f6..63a52ad9a75c 100644
> --- a/arch/arm64/crypto/aes-neonbs-core.S
> +++ b/arch/arm64/crypto/aes-neonbs-core.S
> @@ -788,7 +788,7 @@ SYM_FUNC_START_LOCAL(__xts_crypt8)
>  
>  0:	mov		bskey, x21
>  	mov		rounds, x22
> -	br		x7
> +	br		x16
>  SYM_FUNC_END(__xts_crypt8)
>  
>  	.macro		__xts_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7
> @@ -806,7 +806,7 @@ SYM_FUNC_END(__xts_crypt8)
>  	uzp1		v30.4s, v30.4s, v25.4s
>  	ld1		{v25.16b}, [x24]
>  
> -99:	adr		x7, \do8
> +99:	adr		x16, \do8
>  	bl		__xts_crypt8
>  
>  	ldp		q16, q17, [sp, #.Lframe_local_offset]
> -- 
> 2.25.4
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2020-10-07  8:50 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-06 16:33 [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c Jeremy Linton
2020-10-06 16:33 ` Jeremy Linton
2020-10-06 16:34 ` Ard Biesheuvel
2020-10-06 16:34   ` Ard Biesheuvel
2020-10-06 16:39 ` Mark Brown
2020-10-06 16:39   ` Mark Brown
2020-10-06 17:31 ` [PATCH " Catalin Marinas
2020-10-07  8:49 ` [BUG][PATCH " Dave Martin
2020-10-07  8:49   ` Dave Martin

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.