The following commit has been merged into the objtool/core branch of tip: Commit-ID: d61684b56edf369f0a6d388088d7c9d59f1618d4 Gitweb: https://git.kernel.org/tip/d61684b56edf369f0a6d388088d7c9d59f1618d4 Author: Josh Poimboeuf <jpoim...@redhat.com> AuthorDate: Wed, 24 Feb 2021 10:29:23 -06:00 Committer: Josh Poimboeuf <jpoim...@redhat.com> CommitterDate: Mon, 19 Apr 2021 12:36:36 -05:00
x86/crypto/sha512-avx: 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 <jpoim...@redhat.com> Tested-by: Ard Biesheuvel <a...@kernel.org> Acked-by: Ard Biesheuvel <a...@kernel.org> Tested-by: Sami Tolvanen <samitolva...@google.com> Acked-by: Peter Zijlstra (Intel) <pet...@infradead.org> Acked-by: Herbert Xu <herb...@gondor.apana.org.au> Link: https://lore.kernel.org/r/d36e9ea1c819d87fa89b3df3fa83e2a1ede18146.1614182415.git.jpoim...@redhat.com --- arch/x86/crypto/sha512-avx-asm.S | 41 ++++++++++++++----------------- 1 file changed, 19 insertions(+), 22 deletions(-) diff --git a/arch/x86/crypto/sha512-avx-asm.S b/arch/x86/crypto/sha512-avx-asm.S index 684d58c..3d8f0fd 100644 --- a/arch/x86/crypto/sha512-avx-asm.S +++ b/arch/x86/crypto/sha512-avx-asm.S @@ -76,14 +76,10 @@ tmp0 = %rax W_SIZE = 80*8 # W[t] + K[t] | W[t+1] + K[t+1] WK_SIZE = 2*8 -RSPSAVE_SIZE = 1*8 -GPRSAVE_SIZE = 5*8 frame_W = 0 frame_WK = frame_W + W_SIZE -frame_RSPSAVE = frame_WK + WK_SIZE -frame_GPRSAVE = frame_RSPSAVE + RSPSAVE_SIZE -frame_size = frame_GPRSAVE + GPRSAVE_SIZE +frame_size = frame_WK + WK_SIZE # Useful QWORD "arrays" for simpler memory references # MSG, DIGEST, K_t, W_t are arrays @@ -281,18 +277,18 @@ SYM_FUNC_START(sha512_transform_avx) test msglen, msglen je nowork + # Save GPRs + push %rbx + push %r12 + push %r13 + push %r14 + push %r15 + # Allocate Stack Space - mov %rsp, %rax + push %rbp + mov %rsp, %rbp sub $frame_size, %rsp and $~(0x20 - 1), %rsp - mov %rax, frame_RSPSAVE(%rsp) - - # Save GPRs - mov %rbx, frame_GPRSAVE(%rsp) - mov %r12, frame_GPRSAVE +8*1(%rsp) - mov %r13, frame_GPRSAVE +8*2(%rsp) - mov %r14, frame_GPRSAVE +8*3(%rsp) - mov %r15, frame_GPRSAVE +8*4(%rsp) updateblock: @@ -353,15 +349,16 @@ updateblock: dec msglen jnz updateblock - # Restore GPRs - mov frame_GPRSAVE(%rsp), %rbx - mov frame_GPRSAVE +8*1(%rsp), %r12 - mov frame_GPRSAVE +8*2(%rsp), %r13 - mov frame_GPRSAVE +8*3(%rsp), %r14 - mov frame_GPRSAVE +8*4(%rsp), %r15 - # Restore Stack Pointer - mov frame_RSPSAVE(%rsp), %rsp + mov %rbp, %rsp + pop %rbp + + # Restore GPRs + pop %r15 + pop %r14 + pop %r13 + pop %r12 + pop %rbx nowork: ret
