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authorJosh Poimboeuf <jpoimboe@redhat.com>2021-02-24 19:29:20 +0300
committerJosh Poimboeuf <jpoimboe@redhat.com>2021-04-19 20:36:35 +0300
commit35a0067d2c02a7c35466db5f207b7b9265de84d9 (patch)
tree5bf28a4a40596c6fa434020e9f832a291d133395 /arch/x86/crypto
parent2b02ed55482a1c5c310a7f53707292fcf1601e7a (diff)
downloadlinux-35a0067d2c02a7c35466db5f207b7b9265de84d9.tar.xz
x86/crypto/sha_ni: Standardize stack alignment prologue
Use a more standard prologue for saving the stack pointer before realigning the stack. This enables ORC unwinding by allowing objtool to understand the stack realignment. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Tested-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Tested-by: Sami Tolvanen <samitolvanen@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Link: https://lore.kernel.org/r/5033e1a79867dff1b18e1b4d0783c38897d3f223.1614182415.git.jpoimboe@redhat.com
Diffstat (limited to 'arch/x86/crypto')
-rw-r--r--arch/x86/crypto/sha1_ni_asm.S8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/crypto/sha1_ni_asm.S b/arch/x86/crypto/sha1_ni_asm.S
index 11efe3a45a1f..5d8415f482bd 100644
--- a/arch/x86/crypto/sha1_ni_asm.S
+++ b/arch/x86/crypto/sha1_ni_asm.S
@@ -59,8 +59,6 @@
#define DATA_PTR %rsi /* 2nd arg */
#define NUM_BLKS %rdx /* 3rd arg */
-#define RSPSAVE %rax
-
/* gcc conversion */
#define FRAME_SIZE 32 /* space for 2x16 bytes */
@@ -96,7 +94,8 @@
.text
.align 32
SYM_FUNC_START(sha1_ni_transform)
- mov %rsp, RSPSAVE
+ push %rbp
+ mov %rsp, %rbp
sub $FRAME_SIZE, %rsp
and $~0xF, %rsp
@@ -288,7 +287,8 @@ SYM_FUNC_START(sha1_ni_transform)
pextrd $3, E0, 1*16(DIGEST_PTR)
.Ldone_hash:
- mov RSPSAVE, %rsp
+ mov %rbp, %rsp
+ pop %rbp
ret
SYM_FUNC_END(sha1_ni_transform)