The following commit has been merged into the objtool/core branch of tip: Commit-ID: 27d26793f2105281d9374928448142777cef6f74 Gitweb: https://git.kernel.org/tip/27d26793f2105281d9374928448142777cef6f74 Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> AuthorDate: Wed, 24 Feb 2021 10:29:25 -06:00 Committer: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> CommitterDate: Mon, 19 Apr 2021 12:36:37 -05:00 x86/crypto/sha512-ssse3: 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@xxxxxxxxxx> Tested-by: Ard Biesheuvel <ardb@xxxxxxxxxx> Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx> Tested-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Acked-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/6ecaaac9f3828fbb903513bf90c34a08380a8e35.1614182415.git.jpoimboe@xxxxxxxxxx --- arch/x86/crypto/sha512-ssse3-asm.S | 41 +++++++++++++---------------- 1 file changed, 19 insertions(+), 22 deletions(-) diff --git a/arch/x86/crypto/sha512-ssse3-asm.S b/arch/x86/crypto/sha512-ssse3-asm.S index 50812af..bd51c90 100644 --- a/arch/x86/crypto/sha512-ssse3-asm.S +++ b/arch/x86/crypto/sha512-ssse3-asm.S @@ -74,14 +74,10 @@ tmp0 = %rax W_SIZE = 80*8 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 @@ -283,18 +279,18 @@ SYM_FUNC_START(sha512_transform_ssse3) 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: @@ -355,15 +351,16 @@ 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
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