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KVM: x86: Convert em_salc() to C

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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
This commit is contained in:
Peter Zijlstra 2025-04-26 13:07:14 +02:00
parent 2d82acd7d6
commit 77892e1fef
1 changed files with 9 additions and 6 deletions
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15
arch/x86/kvm/emulate.c
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@ -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,