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Date: Mon, 18 Sep 2017 14:42:05 -0500 From: Josh Poimboeuf <jpoimboe@...hat.com> To: Herbert Xu <herbert@...dor.apana.org.au>, "David S. Miller" <davem@...emloft.net> Cc: x86@...nel.org, linux-kernel@...r.kernel.org, Tim Chen <tim.c.chen@...ux.intel.com>, Mathias Krause <minipli@...glemail.com>, Jussi Kivilinna <jussi.kivilinna@....fi>, Peter Zijlstra <peterz@...radead.org>, linux-crypto@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>, Andy Lutomirski <luto@...nel.org>, Jiri Slaby <jslaby@...e.cz> Subject: [PATCH v2 06/12] x86/crypto: Fix RBP usage in sha1_avx2_x86_64_asm.S 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. Reported-by: Eric Biggers <ebiggers@...gle.com> Reported-by: Peter Zijlstra <peterz@...radead.org> Tested-by: Eric Biggers <ebiggers@...gle.com> Acked-by: Eric Biggers <ebiggers@...gle.com> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com> --- 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 -- 2.13.5
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