Commit 539012dc authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Herbert Xu

crypto: x86/sha256-ssse3 - Fix RBP usage

Using RBP as a temporary register breaks frame pointer convention and
breaks stack traces when unwinding from an interrupt in the crypto code.

Swap the usages of R12 and RBP.  Use R12 for the TBL register, and use
RBP to store the pre-aligned stack pointer.
Reported-by: default avatarEric Biggers <ebiggers@google.com>
Reported-by: default avatarPeter Zijlstra <peterz@infradead.org>
Tested-by: default avatarEric Biggers <ebiggers@google.com>
Acked-by: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent d3dfbfe2
......@@ -95,7 +95,7 @@ SRND = %rsi # clobbers INP
c = %ecx
d = %r8d
e = %edx
TBL = %rbp
TBL = %r12
a = %eax
b = %ebx
......@@ -356,13 +356,13 @@ a = TMP_
ENTRY(sha256_transform_ssse3)
.align 32
pushq %rbx
pushq %rbp
pushq %r12
pushq %r13
pushq %r14
pushq %r15
pushq %r12
pushq %rbp
mov %rsp, %rbp
mov %rsp, %r12
subq $STACK_SIZE, %rsp
and $~15, %rsp
......@@ -462,13 +462,12 @@ loop2:
done_hash:
mov %r12, %rsp
popq %r12
mov %rbp, %rsp
popq %rbp
popq %r15
popq %r14
popq %r13
popq %rbp
popq %r12
popq %rbx
ret
......
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