On 08/29/2017 11:05 AM, Josh Poimboeuf wrote: > Using RBP as a temporary register breaks frame pointer convention and > breaks stack traces when unwinding from an interrupt in the crypto code. > > Use R11 instead of RBP. Since R11 isn't a callee-saved register, it > doesn't need to be saved and restored on the stack. These changes seem okay. Thanks. Tim > > Reported-by: Eric Biggers <ebiggers@xxxxxxxxxx> > Reported-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> > --- > arch/x86/crypto/sha1_avx2_x86_64_asm.S | 4 +--- > 1 file changed, 1 insertion(+), 3 deletions(-) > > diff --git a/arch/x86/crypto/sha1_avx2_x86_64_asm.S b/arch/x86/crypto/sha1_avx2_x86_64_asm.S > index 1eab79c9ac48..9f712a7dfd79 100644 > --- a/arch/x86/crypto/sha1_avx2_x86_64_asm.S > +++ b/arch/x86/crypto/sha1_avx2_x86_64_asm.S > @@ -89,7 +89,7 @@ > #define REG_RE %rdx > #define REG_RTA %r12 > #define REG_RTB %rbx > -#define REG_T1 %ebp > +#define REG_T1 %r11d > #define xmm_mov vmovups > #define avx2_zeroupper vzeroupper > #define RND_F1 1 > @@ -637,7 +637,6 @@ _loop3: > ENTRY(\name) > > push %rbx > - push %rbp > push %r12 > push %r13 > push %r14 > @@ -673,7 +672,6 @@ _loop3: > pop %r14 > pop %r13 > pop %r12 > - pop %rbp > pop %rbx > > ret >
