diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2025-04-26 13:07:14 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-08-18 14:23:06 +0200 |
| commit | 77892e1fef34db650aa3de4be1d27267ca7f1330 (patch) | |
| tree | aaf74f7997792ba6b831c0eabf4b1713ca96de5b | |
| parent | 2d82acd7d6a7eba2ed2bf84ab7440c1ad7c27958 (diff) | |
KVM: x86: Convert em_salc() to C
Implement the SALC (Set AL if Carry) instruction in C.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Sean Christopherson <seanjc@google.com>
Link: https://lkml.kernel.org/r/20250714103440.634145269@infradead.org
| -rw-r--r-- | arch/x86/kvm/emulate.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 390b8a93cd2c..94008cd12f1e 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -529,11 +529,14 @@ static int fastop(struct x86_emulate_ctxt *ctxt, fastop_t fop); ON64(FOP3E(op##q, rax, rdx, cl)) \ FOP_END -FOP_START(salc) -FOP_FUNC(salc) -"pushf; sbb %al, %al; popf \n\t" -FOP_RET(salc) -FOP_END; +static int em_salc(struct x86_emulate_ctxt *ctxt) +{ + /* + * Set AL 0xFF if CF is set, or 0x00 when clear. + */ + ctxt->dst.val = 0xFF * !!(ctxt->eflags & X86_EFLAGS_CF); + return X86EMUL_CONTINUE; +} /* * XXX: inoutclob user must know where the argument is being expanded. @@ -4423,7 +4426,7 @@ static const struct opcode opcode_table[256] = { G(Src2CL | ByteOp, group2), G(Src2CL, group2), I(DstAcc | SrcImmUByte | No64, em_aam), I(DstAcc | SrcImmUByte | No64, em_aad), - F(DstAcc | ByteOp | No64, em_salc), + I(DstAcc | ByteOp | No64, em_salc), I(DstAcc | SrcXLat | ByteOp, em_mov), /* 0xD8 - 0xDF */ N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N, |