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>
This commit is contained in:
Josh Poimboeuf 2016-01-21 16:49:18 -06:00 committed by Ingo Molnar
parent aec4d0e301
commit 68874ac330

View File

@ -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