Gprof prooved the PowerPC emulation spent too much time in MSR load and store

routines. Coming back to a raw MSR storage model then speed-up the emulation.
Improve fast MSR updates (wrtee wrteei and mtriee cases).
Share rfi family instructions helpers code to avoid bug in duplicated code.
Allow entering halt mode as the result of a rfi instruction.
Add a new helper_regs.h file to avoid duplication of special registers
 manipulation routines (currently XER and MSR).


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3436 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 142 insertions, 0 deletions

diff --git a/target-ppc/helper_regs.h b/target-ppc/helper_regs.h
new file mode 100644
index 0000000..75a3ddd
--- /dev/null
+++ b/target-ppc/helper_regs.h
@@ -0,0 +1,142 @@
+/*
+ *  PowerPC emulation special registers manipulation helpers for qemu.
+ *
+ *  Copyright (c) 2003-2007 Jocelyn Mayer
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if !defined(__HELPER_REGS_H__)
+#define __HELPER_REGS_H__
+
+static always_inline target_ulong hreg_load_xer (CPUPPCState *env)
+{
+    return (xer_so << XER_SO) |
+        (xer_ov << XER_OV) |
+        (xer_ca << XER_CA) |
+        (xer_bc << XER_BC) |
+        (xer_cmp << XER_CMP);
+}
+
+static always_inline void hreg_store_xer (CPUPPCState *env, target_ulong value)
+{
+    xer_so = (value >> XER_SO) & 0x01;
+    xer_ov = (value >> XER_OV) & 0x01;
+    xer_ca = (value >> XER_CA) & 0x01;
+    xer_cmp = (value >> XER_CMP) & 0xFF;
+    xer_bc = (value >> XER_BC) & 0x7F;
+}
+
+/* Swap temporary saved registers with GPRs */
+static always_inline void hreg_swap_gpr_tgpr (CPUPPCState *env)
+{
+    ppc_gpr_t tmp;
+
+    tmp = env->gpr[0];
+    env->gpr[0] = env->tgpr[0];
+    env->tgpr[0] = tmp;
+    tmp = env->gpr[1];
+    env->gpr[1] = env->tgpr[1];
+    env->tgpr[1] = tmp;
+    tmp = env->gpr[2];
+    env->gpr[2] = env->tgpr[2];
+    env->tgpr[2] = tmp;
+    tmp = env->gpr[3];
+    env->gpr[3] = env->tgpr[3];
+    env->tgpr[3] = tmp;
+}
+
+static always_inline void hreg_compute_hflags (CPUPPCState *env)
+{
+    target_ulong hflags_mask;
+
+    /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */
+    hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) |
+        (1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) |
+        (1 << MSR_LE);
+#if defined (TARGET_PPC64)
+    hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF);
+#if defined (TARGET_PPC64H)
+    hflags_mask |= 1ULL << MSR_HV;
+    /* Precompute MMU index */
+    if (msr_pr == 0 && msr_hv != 0)
+        env->mmu_idx = 2;
+    else
+#endif
+#endif
+        env->mmu_idx = 1 - msr_pr;
+    env->hflags = env->msr & hflags_mask;
+}
+
+static always_inline int hreg_store_msr (CPUPPCState *env, target_ulong value)
+{
+    int enter_pm, excp;
+
+    excp = 0;
+    value &= env->msr_mask;
+#if !defined (CONFIG_USER_ONLY)
+    if (((value >> MSR_IR) & 1) != msr_ir ||
+        ((value >> MSR_DR) & 1) != msr_dr) {
+        /* Flush all tlb when changing translation mode */
+        tlb_flush(env, 1);
+        excp = POWERPC_EXCP_NONE;
+        env->interrupt_request |= CPU_INTERRUPT_EXITTB;
+    }
+    if (unlikely((env->flags & POWERPC_FLAG_TGPR) &&
+                 ((value ^ env->msr) & (1 << MSR_TGPR)))) {
+        /* Swap temporary saved registers with GPRs */
+        hreg_swap_gpr_tgpr(env);
+    }
+    if (unlikely((value >> MSR_EP) & 1) != msr_ep) {
+        /* Change the exception prefix on PowerPC 601 */
+        env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
+    }
+#endif
+    env->msr = value;
+    hreg_compute_hflags(env);
+    enter_pm = 0;
+#if !defined (CONFIG_USER_ONLY)
+    if (unlikely(msr_pow == 1)) {
+        switch (env->excp_model) {
+        case POWERPC_EXCP_603:
+        case POWERPC_EXCP_603E:
+        case POWERPC_EXCP_G2:
+            /* Don't handle SLEEP mode: we should disable all clocks...
+             * No dynamic power-management.
+             */
+            if ((env->spr[SPR_HID0] & 0x00C00000) != 0)
+                enter_pm = 1;
+            break;
+        case POWERPC_EXCP_604:
+            enter_pm = 1;
+            break;
+        case POWERPC_EXCP_7x0:
+            if ((env->spr[SPR_HID0] & 0x00E00000) != 0)
+                enter_pm = 1;
+            break;
+        default:
+            break;
+        }
+        if (enter_pm) {
+            env->halted = 1;
+            excp = EXCP_HALTED;
+        }
+    }
+#endif
+
+    return excp;
+}
+
+#endif /* !defined(__HELPER_REGS_H__) */