crypto: arm64/aes-neon - move literal data to .rodata section

Move the S-boxes and some other literals to the .rodata section where
it is safe from being exploited by speculative execution.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/arch/arm64/crypto/aes-neon.S b/arch/arm64/crypto/aes-neon.S
index f1e3aa2..1c7b45b 100644 (file)
--- a/arch/arm64/crypto/aes-neon.S
+++ b/arch/arm64/crypto/aes-neon.S
@@ -32,10 +32,10 @@
 
        /* preload the entire Sbox */
        .macro          prepare, sbox, shiftrows, temp
-       adr             \temp, \sbox
        movi            v12.16b, #0x1b
-       ldr             q13, \shiftrows
-       ldr             q14, .Lror32by8
+       ldr_l           q13, \shiftrows, \temp
+       ldr_l           q14, .Lror32by8, \temp
+       adr_l           \temp, \sbox
        ld1             {v16.16b-v19.16b}, [\temp], #64
        ld1             {v20.16b-v23.16b}, [\temp], #64
        ld1             {v24.16b-v27.16b}, [\temp], #64
@@ -272,7 +272,7 @@
 
 #include "aes-modes.S"
 
-       .text
+       .section        ".rodata", "a"
        .align          6
 .LForward_Sbox:
        .byte           0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5