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[PULL,069/118] PPC: Add dcbtls emulation

Message ID 1401885899-16524-70-git-send-email-agraf@suse.de
State New
Headers show

Commit Message

Alexander Graf June 4, 2014, 12:44 p.m. UTC 
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>
---
 target-ppc/translate.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 6aede79..e205e0c 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -4480,6 +4480,17 @@  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)
 {
@@ -10214,6 +10225,7 @@  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),