PPC: Add dcbtls emulation

The dcbtls instruction is able to lock data inside the L1 cache.

Unfortunately we don't emulate any caches, so we have to tell the guest
that its locking attempt failed.

However, by implementing the instruction we at least don't give the
guest a program exception which it definitely does not expect.

Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 7be776f161f914b0043b5843294018c14c2dd1f2..a2402835eb54db05e7ff7e2a4a5fbdd2bc7bcb78 100644 (file)
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -4481,6 +4481,17 @@ static void gen_dcbtst(DisasContext *ctx)
      */
 }
 
+/* dcbtls */
+static void gen_dcbtls(DisasContext *ctx)
+{
+    /* Always fails locking the cache */
+    TCGv t0 = tcg_temp_new();
+    gen_load_spr(t0, SPR_Exxx_L1CSR0);
+    tcg_gen_ori_tl(t0, t0, L1CSR0_CUL);
+    gen_store_spr(SPR_Exxx_L1CSR0, t0);
+    tcg_temp_free(t0);
+}
+
 /* dcbz */
 static void gen_dcbz(DisasContext *ctx)
 {
@@ -10215,6 +10226,7 @@ GEN_HANDLER(dcbi, 0x1F, 0x16, 0x0E, 0x03E00001, PPC_CACHE),
 GEN_HANDLER(dcbst, 0x1F, 0x16, 0x01, 0x03E00001, PPC_CACHE),
 GEN_HANDLER(dcbt, 0x1F, 0x16, 0x08, 0x00000001, PPC_CACHE),
 GEN_HANDLER(dcbtst, 0x1F, 0x16, 0x07, 0x00000001, PPC_CACHE),
+GEN_HANDLER_E(dcbtls, 0x1F, 0x06, 0x05, 0x02000001, PPC_BOOKE, PPC2_BOOKE206),
 GEN_HANDLER(dcbz, 0x1F, 0x16, 0x1F, 0x03C00001, PPC_CACHE_DCBZ),
 GEN_HANDLER(dst, 0x1F, 0x16, 0x0A, 0x01800001, PPC_ALTIVEC),
 GEN_HANDLER(dstst, 0x1F, 0x16, 0x0B, 0x02000001, PPC_ALTIVEC),