[PULL 29/41] target/ppc: Simplify powerpc_excp_books

["Cédric Le Goater" <clg@kaod.org>]

From: Fabiano Rosas <farosas@linux.ibm.com>

Differences from the generic powerpc_excp code:

- Not BookE, so some MSR bits are cleared at interrupt dispatch;
- Always uses HV_EMU if the CPU has MSR_HV;
- Exceptions always delivered in 64 bit.

Exceptions used:

POWERPC_EXCP_ALIGN
POWERPC_EXCP_DECR
POWERPC_EXCP_DSEG
POWERPC_EXCP_DSI
POWERPC_EXCP_EXTERNAL
POWERPC_EXCP_FPU
POWERPC_EXCP_FU
POWERPC_EXCP_HDECR
POWERPC_EXCP_HDSI
POWERPC_EXCP_HISI
POWERPC_EXCP_HVIRT
POWERPC_EXCP_HV_EMU
POWERPC_EXCP_HV_FU
POWERPC_EXCP_ISEG
POWERPC_EXCP_ISI
POWERPC_EXCP_MAINT
POWERPC_EXCP_MCHECK
POWERPC_EXCP_PERFM
POWERPC_EXCP_PROGRAM
POWERPC_EXCP_RESET
POWERPC_EXCP_SDOOR_HV
POWERPC_EXCP_SYSCALL
POWERPC_EXCP_SYSCALL_VECTORED
POWERPC_EXCP_THERM
POWERPC_EXCP_TRACE
POWERPC_EXCP_VPU
POWERPC_EXCP_VPUA
POWERPC_EXCP_VSXU

POWERPC_EXCP_HV_MAINT
POWERPC_EXCP_SDOOR

(I added the two above that were not being considered. They used to be
"Invalid exception". Now they become "Unimplemented exception" which
is more accurate.)

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220124184605.999353-3-farosas@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/excp_helper.c | 161 ++++-----------------------------------
 1 file changed, 14 insertions(+), 147 deletions(-)

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index a2a605f8f59e..161b207bc7b8 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -551,6 +551,7 @@ static void powerpc_excp_40x(PowerPCCPU *cpu, int excp)
     powerpc_set_excp_state(cpu, vector, new_msr);
 }
 
+#ifdef TARGET_PPC64
 static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
 {
     CPUState *cs = CPU(cpu);
@@ -568,11 +569,7 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
                   excp, env->error_code);
 
     /* new srr1 value excluding must-be-zero bits */
-    if (excp_model == POWERPC_EXCP_BOOKE) {
-        msr = env->msr;
-    } else {
-        msr = env->msr & ~0x783f0000ULL;
-    }
+    msr = env->msr & ~0x783f0000ULL;
 
     /*
      * new interrupt handler msr preserves existing HV and ME unless
@@ -593,29 +590,13 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
     }
 
     /*
-     * Hypervisor emulation assistance interrupt only exists on server
-     * arch 2.05 server or later. We also don't want to generate it if
-     * we don't have HVB in msr_mask (PAPR mode).
+     * We don't want to generate a Hypervisor Emulation Assistance
+     * Interrupt if we don't have HVB in msr_mask (PAPR mode).
      */
-    if (excp == POWERPC_EXCP_HV_EMU
-#if defined(TARGET_PPC64)
-        && !(mmu_is_64bit(env->mmu_model) && (env->msr_mask & MSR_HVB))
-#endif /* defined(TARGET_PPC64) */
-
-    ) {
+    if (excp == POWERPC_EXCP_HV_EMU && !(env->msr_mask & MSR_HVB)) {
         excp = POWERPC_EXCP_PROGRAM;
     }
 
-#ifdef TARGET_PPC64
-    /*
-     * SPEU and VPU share the same IVOR but they exist in different
-     * processors. SPEU is e500v1/2 only and VPU is e6500 only.
-     */
-    if (excp_model == POWERPC_EXCP_BOOKE && excp == POWERPC_EXCP_VPU) {
-        excp = POWERPC_EXCP_SPEU;
-    }
-#endif
-
     vector = env->excp_vectors[excp];
     if (vector == (target_ulong)-1ULL) {
         cpu_abort(cs, "Raised an exception without defined vector %d\n",
@@ -625,22 +606,6 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
     vector |= env->excp_prefix;
 
     switch (excp) {
-    case POWERPC_EXCP_CRITICAL:    /* Critical input                         */
-        switch (excp_model) {
-        case POWERPC_EXCP_40x:
-            srr0 = SPR_40x_SRR2;
-            srr1 = SPR_40x_SRR3;
-            break;
-        case POWERPC_EXCP_BOOKE:
-            srr0 = SPR_BOOKE_CSRR0;
-            srr1 = SPR_BOOKE_CSRR1;
-            break;
-        case POWERPC_EXCP_G2:
-            break;
-        default:
-            goto excp_invalid;
-        }
-        break;
     case POWERPC_EXCP_MCHECK:    /* Machine check exception                  */
         if (msr_me == 0) {
             /*
@@ -817,50 +782,8 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
         env->ctr = msr;
         break;
     case POWERPC_EXCP_FPU:       /* Floating-point unavailable exception     */
-    case POWERPC_EXCP_APU:       /* Auxiliary processor unavailable          */
     case POWERPC_EXCP_DECR:      /* Decrementer exception                    */
         break;
-    case POWERPC_EXCP_FIT:       /* Fixed-interval timer interrupt           */
-        /* FIT on 4xx */
-        trace_ppc_excp_print("FIT");
-        break;
-    case POWERPC_EXCP_WDT:       /* Watchdog timer interrupt                 */
-        trace_ppc_excp_print("WDT");
-        switch (excp_model) {
-        case POWERPC_EXCP_BOOKE:
-            srr0 = SPR_BOOKE_CSRR0;
-            srr1 = SPR_BOOKE_CSRR1;
-            break;
-        default:
-            break;
-        }
-        break;
-    case POWERPC_EXCP_DTLB:      /* Data TLB error                           */
-    case POWERPC_EXCP_ITLB:      /* Instruction TLB error                    */
-        break;
-    case POWERPC_EXCP_DEBUG:     /* Debug interrupt                          */
-        if (env->flags & POWERPC_FLAG_DE) {
-            /* FIXME: choose one or the other based on CPU type */
-            srr0 = SPR_BOOKE_DSRR0;
-            srr1 = SPR_BOOKE_DSRR1;
-
-            env->spr[SPR_BOOKE_CSRR0] = env->nip;
-            env->spr[SPR_BOOKE_CSRR1] = msr;
-
-            /* DBSR already modified by caller */
-        } else {
-            cpu_abort(cs, "Debug exception triggered on unsupported model\n");
-        }
-        break;
-    case POWERPC_EXCP_SPEU:   /* SPE/embedded floating-point unavailable/VPU  */
-        env->spr[SPR_BOOKE_ESR] = ESR_SPV;
-        break;
-    case POWERPC_EXCP_DOORI:     /* Embedded doorbell interrupt              */
-        break;
-    case POWERPC_EXCP_DOORCI:    /* Embedded doorbell critical interrupt     */
-        srr0 = SPR_BOOKE_CSRR0;
-        srr1 = SPR_BOOKE_CSRR1;
-        break;
     case POWERPC_EXCP_RESET:     /* System reset exception                   */
         /* A power-saving exception sets ME, otherwise it is unchanged */
         if (msr_pow) {
@@ -890,8 +813,6 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
         /* fall through */
     case POWERPC_EXCP_HDECR:     /* Hypervisor decrementer exception         */
     case POWERPC_EXCP_HDSI:      /* Hypervisor data storage exception        */
-    case POWERPC_EXCP_HDSEG:     /* Hypervisor data segment exception        */
-    case POWERPC_EXCP_HISEG:     /* Hypervisor instruction segment exception */
     case POWERPC_EXCP_SDOOR_HV:  /* Hypervisor Doorbell interrupt            */
     case POWERPC_EXCP_HV_EMU:
     case POWERPC_EXCP_HVIRT:     /* Hypervisor virtualization                */
@@ -903,70 +824,25 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
     case POWERPC_EXCP_VPU:       /* Vector unavailable exception             */
     case POWERPC_EXCP_VSXU:       /* VSX unavailable exception               */
     case POWERPC_EXCP_FU:         /* Facility unavailable exception          */
-#ifdef TARGET_PPC64
         env->spr[SPR_FSCR] |= ((target_ulong)env->error_code << 56);
-#endif
         break;
     case POWERPC_EXCP_HV_FU:     /* Hypervisor Facility Unavailable Exception */
-#ifdef TARGET_PPC64
         env->spr[SPR_HFSCR] |= ((target_ulong)env->error_code << FSCR_IC_POS);
         srr0 = SPR_HSRR0;
         srr1 = SPR_HSRR1;
         new_msr |= (target_ulong)MSR_HVB;
         new_msr |= env->msr & ((target_ulong)1 << MSR_RI);
-#endif
-        break;
-    case POWERPC_EXCP_PIT:       /* Programmable interval timer interrupt    */
-        trace_ppc_excp_print("PIT");
-        break;
-    case POWERPC_EXCP_IFTLB:     /* Instruction fetch TLB error              */
-    case POWERPC_EXCP_DLTLB:     /* Data load TLB miss                       */
-    case POWERPC_EXCP_DSTLB:     /* Data store TLB miss                      */
-        switch (excp_model) {
-        case POWERPC_EXCP_602:
-        case POWERPC_EXCP_603:
-        case POWERPC_EXCP_G2:
-            /* Swap temporary saved registers with GPRs */
-            if (!(new_msr & ((target_ulong)1 << MSR_TGPR))) {
-                new_msr |= (target_ulong)1 << MSR_TGPR;
-                hreg_swap_gpr_tgpr(env);
-            }
-            /* fall through */
-        case POWERPC_EXCP_7x5:
-            ppc_excp_debug_sw_tlb(env, excp);
-
-            msr |= env->crf[0] << 28;
-            msr |= env->error_code; /* key, D/I, S/L bits */
-            /* Set way using a LRU mechanism */
-            msr |= ((env->last_way + 1) & (env->nb_ways - 1)) << 17;
-            break;
-        default:
-            cpu_abort(cs, "Invalid TLB miss exception\n");
-            break;
-        }
         break;
-    case POWERPC_EXCP_EFPDI:     /* Embedded floating-point data interrupt   */
-    case POWERPC_EXCP_EFPRI:     /* Embedded floating-point round interrupt  */
-    case POWERPC_EXCP_EPERFM:    /* Embedded performance monitor interrupt   */
-    case POWERPC_EXCP_IO:        /* IO error exception                       */
-    case POWERPC_EXCP_RUNM:      /* Run mode exception                       */
-    case POWERPC_EXCP_EMUL:      /* Emulation trap exception                 */
-    case POWERPC_EXCP_FPA:       /* Floating-point assist exception          */
-    case POWERPC_EXCP_DABR:      /* Data address breakpoint                  */
-    case POWERPC_EXCP_IABR:      /* Instruction address breakpoint           */
-    case POWERPC_EXCP_SMI:       /* System management interrupt              */
     case POWERPC_EXCP_THERM:     /* Thermal interrupt                        */
     case POWERPC_EXCP_PERFM:     /* Embedded performance monitor interrupt   */
     case POWERPC_EXCP_VPUA:      /* Vector assist exception                  */
-    case POWERPC_EXCP_SOFTP:     /* Soft patch exception                     */
     case POWERPC_EXCP_MAINT:     /* Maintenance exception                    */
-    case POWERPC_EXCP_MEXTBR:    /* Maskable external breakpoint             */
-    case POWERPC_EXCP_NMEXTBR:   /* Non maskable external breakpoint         */
+    case POWERPC_EXCP_SDOOR:     /* Doorbell interrupt                       */
+    case POWERPC_EXCP_HV_MAINT:  /* Hypervisor Maintenance exception         */
         cpu_abort(cs, "%s exception not implemented\n",
                   powerpc_excp_name(excp));
         break;
     default:
-    excp_invalid:
         cpu_abort(cs, "Invalid PowerPC exception %d. Aborting\n", excp);
         break;
     }
@@ -991,22 +867,7 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
         new_msr |= (target_ulong)1 << MSR_LE;
     }
 
-#if defined(TARGET_PPC64)
-    if (excp_model == POWERPC_EXCP_BOOKE) {
-        if (env->spr[SPR_BOOKE_EPCR] & EPCR_ICM) {
-            /* Cat.64-bit: EPCR.ICM is copied to MSR.CM */
-            new_msr |= (target_ulong)1 << MSR_CM;
-        } else {
-            vector = (uint32_t)vector;
-        }
-    } else {
-        if (!msr_isf && !mmu_is_64bit(env->mmu_model)) {
-            vector = (uint32_t)vector;
-        } else {
-            new_msr |= (target_ulong)1 << MSR_SF;
-        }
-    }
-#endif
+    new_msr |= (target_ulong)1 << MSR_SF;
 
     if (excp != POWERPC_EXCP_SYSCALL_VECTORED) {
         /* Save PC */
@@ -1021,6 +882,12 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
 
     powerpc_set_excp_state(cpu, vector, new_msr);
 }
+#else
+static inline void powerpc_excp_books(PowerPCCPU *cpu, int excp)
+{
+    g_assert_not_reached();
+}
+#endif
 
 /*
  * Note that this function should be greatly optimized when called
-- 
2.34.1