crypto: x86/chacha20 - satisfy stack validation 2.0
authorJason A. Donenfeld <Jason@zx2c4.com>
Sun, 8 Oct 2017 20:50:53 +0000 (22:50 +0200)
committerHerbert Xu <herbert@gondor.apana.org.au>
Thu, 12 Oct 2017 14:51:16 +0000 (22:51 +0800)
commit4635742d1cef5ee5f217f89310a8782ebb4e25dd
tree21f54e060311132e108c05b48686ca3d2e3d4db0
parentb61907bb42409adf9b3120f741af7c57dd7e3db2
crypto: x86/chacha20 - satisfy stack validation 2.0

The new stack validator in objdump doesn't like directly assigning r11
to rsp, warning with something like:

warning: objtool: chacha20_4block_xor_ssse3()+0xa: unsupported stack pointer realignment
warning: objtool: chacha20_8block_xor_avx2()+0x6: unsupported stack pointer realignment

This fixes things up to use code similar to gcc's DRAP register, so that
objdump remains happy.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Fixes: baa41469a7b9 ("objtool: Implement stack validation 2.0")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
arch/x86/crypto/chacha20-avx2-x86_64.S
arch/x86/crypto/chacha20-ssse3-x86_64.S