diff options
| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2016-01-21 16:49:18 -0600 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-02-24 08:35:42 +0100 |
| commit | 68874ac3304ade7ed5ebb12af00d6b9bbbca0a16 (patch) | |
| tree | 80821f6357e7a7fa65498ae4b7bcc58a827b30d9 /arch/x86/crypto | |
| parent | aec4d0e301f17bb143341c82cc44685b8af0b945 (diff) | |
x86/asm/crypto: Don't use RBP as a scratch register
The frame pointer (RBP) is getting clobbered in
sha1_mb_mgr_submit_avx2() before a function call, which can mess up
stack traces. Use R12 instead.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Bernd Petrovitsch <bernd@petrovitsch.priv.at>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Chris J Arges <chris.j.arges@canonical.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Pedro Alves <palves@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: live-patching@vger.kernel.org
Link: http://lkml.kernel.org/r/15a3eb7ebe68e37755927915f45e4f0bde4d18c5.1453405861.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/crypto')
| -rw-r--r-- | arch/x86/crypto/sha-mb/sha1_mb_mgr_submit_avx2.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/crypto/sha-mb/sha1_mb_mgr_submit_avx2.S b/arch/x86/crypto/sha-mb/sha1_mb_mgr_submit_avx2.S index a5a14c62d843..c3b944781d3f 100644 --- a/arch/x86/crypto/sha-mb/sha1_mb_mgr_submit_avx2.S +++ b/arch/x86/crypto/sha-mb/sha1_mb_mgr_submit_avx2.S @@ -86,8 +86,8 @@ job_rax = %rax len = %rax DWORD_len = %eax -lane = %rbp -tmp3 = %rbp +lane = %r12 +tmp3 = %r12 tmp = %r9 DWORD_tmp = %r9d @@ -99,7 +99,7 @@ lane_data = %r10 # arg 2 : rdx : job ENTRY(sha1_mb_mgr_submit_avx2) push %rbx - push %rbp + push %r12 mov _unused_lanes(state), unused_lanes mov unused_lanes, lane @@ -190,7 +190,7 @@ len_is_0: movl DWORD_tmp, _result_digest+1*16(job_rax) return: - pop %rbp + pop %r12 pop %rbx ret |