Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
+9
-6
+9
-6
arch/x86/kvm/emulate.c
+9
-6
arch/x86/kvm/emulate.c
···
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ON64(FOP3E(op##q, rax, rdx, cl)) \
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FOP_END
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531
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-
FOP_START(salc)
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FOP_FUNC(salc)
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-
"pushf; sbb %al, %al; popf \n\t"
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-
FOP_RET(salc)
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-
FOP_END;
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+
static int em_salc(struct x86_emulate_ctxt *ctxt)
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+
{
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+
/*
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* Set AL 0xFF if CF is set, or 0x00 when clear.
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+
*/
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ctxt->dst.val = 0xFF * !!(ctxt->eflags & X86_EFLAGS_CF);
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return X86EMUL_CONTINUE;
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+
}
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/*
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* XXX: inoutclob user must know where the argument is being expanded.
···
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G(Src2CL | ByteOp, group2), G(Src2CL, group2),
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I(DstAcc | SrcImmUByte | No64, em_aam),
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I(DstAcc | SrcImmUByte | No64, em_aad),
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-
F(DstAcc | ByteOp | No64, em_salc),
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+
I(DstAcc | ByteOp | No64, em_salc),
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I(DstAcc | SrcXLat | ByteOp, em_mov),
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/* 0xD8 - 0xDF */
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N, E(0, &escape_d9), N, E(0, &escape_db), N, E(0, &escape_dd), N, N,