Implement PowerPC slbmfee and slbmfev instructions

For a 64-bit PowerPC target, qemu correctly implements translation
through the segment lookaside buffer.  Likewise it supports the
slbmte instruction which is used to load entries into the SLB.

However, it does not emulate the slbmfee and slbmfev instructions
which read SLB entries back into registers.  Because these are
only occasionally used in guests (mostly for debugging) we get
away with it.

However, given the recent SLB cleanups, it becomes quite easy to
implement these, and thereby allow, amongst other things, a guest
Linux to use xmon's command to dump the SLB.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 36ca34228633efe1028c6351ec0d6bd1d15f13bb..f293f859762d22f7b748290e91404bc158837c46 100644 (file)
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -779,6 +779,8 @@ void ppc_store_asr (CPUPPCState *env, target_ulong value);
 target_ulong ppc_load_slb (CPUPPCState *env, int slb_nr);
 target_ulong ppc_load_sr (CPUPPCState *env, int sr_nr);
 int ppc_store_slb (CPUPPCState *env, target_ulong rb, target_ulong rs);
+int ppc_load_slb_esid (CPUPPCState *env, target_ulong rb, target_ulong *rt);
+int ppc_load_slb_vsid (CPUPPCState *env, target_ulong rb, target_ulong *rt);
 #endif /* defined(TARGET_PPC64) */
 void ppc_store_sr (CPUPPCState *env, int srnum, target_ulong value);
 #endif /* !defined(CONFIG_USER_ONLY) */

diff --git a/target-ppc/helper.c b/target-ppc/helper.c
index 452a35cb484d15ea1fb5d6d71aec41c99c949de4..b9621d2dd0c51a737fb4f3b9a5385533cc661150 100644 (file)
--- a/target-ppc/helper.c
+++ b/target-ppc/helper.c
@@ -774,6 +774,32 @@ int ppc_store_slb (CPUPPCState *env, target_ulong rb, target_ulong rs)
 
     return 0;
 }
+
+int ppc_load_slb_esid (CPUPPCState *env, target_ulong rb, target_ulong *rt)
+{
+    int slot = rb & 0xfff;
+    ppc_slb_t *slb = &env->slb[slot];
+
+    if (slot >= env->slb_nr) {
+        return -1;
+    }
+
+    *rt = slb->esid;
+    return 0;
+}
+
+int ppc_load_slb_vsid (CPUPPCState *env, target_ulong rb, target_ulong *rt)
+{
+    int slot = rb & 0xfff;
+    ppc_slb_t *slb = &env->slb[slot];
+
+    if (slot >= env->slb_nr) {
+        return -1;
+    }
+
+    *rt = slb->vsid;
+    return 0;
+}
 #endif /* defined(TARGET_PPC64) */
 
 /* Perform segment based translation */

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index d512cb00e266e44e89c9141cfa0f9f6df0e4920f..1a69cf876c952613a2b5f5452d54d4b7ee24fc2b 100644 (file)
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -341,6 +341,8 @@ DEF_HELPER_FLAGS_0(tlbia, TCG_CALL_CONST, void)
 DEF_HELPER_FLAGS_1(tlbie, TCG_CALL_CONST, void, tl)
 #if defined(TARGET_PPC64)
 DEF_HELPER_FLAGS_2(store_slb, TCG_CALL_CONST, void, tl, tl)
+DEF_HELPER_1(load_slb_esid, tl, tl)
+DEF_HELPER_1(load_slb_vsid, tl, tl)
 DEF_HELPER_FLAGS_0(slbia, TCG_CALL_CONST, void)
 DEF_HELPER_FLAGS_1(slbie, TCG_CALL_CONST, void, tl)
 #endif

diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index bf41627b213fc6ce0e9f9f2c539e692acacb615a..bdb1f1732a530c7b9b22c6feb290b8112e2c588f 100644 (file)
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -3753,6 +3753,26 @@ void helper_store_slb (target_ulong rb, target_ulong rs)
     }
 }
 
+target_ulong helper_load_slb_esid (target_ulong rb)
+{
+    target_ulong rt;
+
+    if (ppc_load_slb_esid(env, rb, &rt) < 0) {
+        helper_raise_exception_err(POWERPC_EXCP_PROGRAM, POWERPC_EXCP_INVAL);
+    }
+    return rt;
+}
+
+target_ulong helper_load_slb_vsid (target_ulong rb)
+{
+    target_ulong rt;
+
+    if (ppc_load_slb_vsid(env, rb, &rt) < 0) {
+        helper_raise_exception_err(POWERPC_EXCP_PROGRAM, POWERPC_EXCP_INVAL);
+    }
+    return rt;
+}
+
 void helper_slbia (void)
 {
     ppc_slb_invalidate_all(env);

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 49eab284a478a5f94f266ecaa839f48897468463..425250832753a3d0637cdeb2037f2424677d2df1 100644 (file)
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -4227,6 +4227,33 @@ static void gen_slbmte(DisasContext *ctx)
 #endif
 }
 
+static void gen_slbmfee(DisasContext *ctx)
+{
+#if defined(CONFIG_USER_ONLY)
+    gen_inval_exception(ctx, POWERPC_EXCP_PRIV_REG);
+#else
+    if (unlikely(!ctx->mem_idx)) {
+        gen_inval_exception(ctx, POWERPC_EXCP_PRIV_REG);
+        return;
+    }
+    gen_helper_load_slb_esid(cpu_gpr[rS(ctx->opcode)],
+                             cpu_gpr[rB(ctx->opcode)]);
+#endif
+}
+
+static void gen_slbmfev(DisasContext *ctx)
+{
+#if defined(CONFIG_USER_ONLY)
+    gen_inval_exception(ctx, POWERPC_EXCP_PRIV_REG);
+#else
+    if (unlikely(!ctx->mem_idx)) {
+        gen_inval_exception(ctx, POWERPC_EXCP_PRIV_REG);
+        return;
+    }
+    gen_helper_load_slb_vsid(cpu_gpr[rS(ctx->opcode)],
+                             cpu_gpr[rB(ctx->opcode)]);
+#endif
+}
 #endif /* defined(TARGET_PPC64) */
 
 /***                      Lookaside buffer management                      ***/
@@ -8300,7 +8327,9 @@ GEN_HANDLER2(mfsrin_64b, "mfsrin", 0x1F, 0x13, 0x14, 0x001F0001,
 GEN_HANDLER2(mtsr_64b, "mtsr", 0x1F, 0x12, 0x06, 0x0010F801, PPC_SEGMENT_64B),
 GEN_HANDLER2(mtsrin_64b, "mtsrin", 0x1F, 0x12, 0x07, 0x001F0001,
              PPC_SEGMENT_64B),
-GEN_HANDLER2(slbmte, "slbmte", 0x1F, 0x12, 0x0C, 0x00000000, PPC_SEGMENT_64B),
+GEN_HANDLER2(slbmte, "slbmte", 0x1F, 0x12, 0x0C, 0x001F0001, PPC_SEGMENT_64B),
+GEN_HANDLER2(slbmfee, "slbmfee", 0x1F, 0x13, 0x1C, 0x001F0001, PPC_SEGMENT_64B),
+GEN_HANDLER2(slbmfev, "slbmfev", 0x1F, 0x13, 0x1A, 0x001F0001, PPC_SEGMENT_64B),
 #endif
 GEN_HANDLER(tlbia, 0x1F, 0x12, 0x0B, 0x03FFFC01, PPC_MEM_TLBIA),
 GEN_HANDLER(tlbiel, 0x1F, 0x12, 0x08, 0x03FF0001, PPC_MEM_TLBIE),