target/ppc: Simplify powerpc_excp_booke

Differences from the generic powerpc_excp code:

- No MSR bits are cleared at interrupt dispatch;
- No MSR_HV;
- No power saving states;
- No Hypervisor Emulation Assistance;
- SPEU needs special handling;
- Big endian only;
- Both 64 and 32 bits;
- No System call vectored;
- No Alternate Interrupt Location.

Exceptions used:

POWERPC_EXCP_ALIGN
POWERPC_EXCP_APU
POWERPC_EXCP_CRITICAL
POWERPC_EXCP_DEBUG
POWERPC_EXCP_DECR
POWERPC_EXCP_DSI
POWERPC_EXCP_DTLB
POWERPC_EXCP_EFPDI
POWERPC_EXCP_EFPRI
POWERPC_EXCP_EXTERNAL
POWERPC_EXCP_FIT
POWERPC_EXCP_FPU
POWERPC_EXCP_ISI
POWERPC_EXCP_ITLB
POWERPC_EXCP_MCHECK
POWERPC_EXCP_PROGRAM
POWERPC_EXCP_RESET
POWERPC_EXCP_SPEU
POWERPC_EXCP_SYSCALL
POWERPC_EXCP_WDT

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Message-Id: <20220128224018.1228062-3-farosas@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

1 files changed, 14 insertions, 151 deletions

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index 1571ab6496..596c16a678 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -761,42 +761,23 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
                   " => %s (%d) error=%02x\n", env->nip, powerpc_excp_name(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;
 
     /*
-     * new interrupt handler msr preserves existing HV and ME unless
+     * new interrupt handler msr preserves existing ME unless
      * explicitly overriden
      */
-    new_msr = env->msr & (((target_ulong)1 << MSR_ME) | MSR_HVB);
+    new_msr = env->msr & ((target_ulong)1 << MSR_ME);
 
     /* target registers */
     srr0 = SPR_SRR0;
     srr1 = SPR_SRR1;
 
     /*
-     * check for special resume at 0x100 from doze/nap/sleep/winkle on
-     * P7/P8/P9
-     */
-    if (env->resume_as_sreset) {
-        excp = powerpc_reset_wakeup(cs, env, excp, &msr);
-    }
-
-    /*
      * 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).
+     * arch 2.05 server or later.
      */
-    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) {
         excp = POWERPC_EXCP_PROGRAM;
     }
 
@@ -805,7 +786,7 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
      * 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) {
+    if (excp == POWERPC_EXCP_VPU) {
         excp = POWERPC_EXCP_SPEU;
     }
 #endif
@@ -998,18 +979,6 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
             new_msr |= (target_ulong)MSR_HVB;
         }
         break;
-    case POWERPC_EXCP_SYSCALL_VECTORED: /* scv exception                     */
-        lev = env->error_code;
-        dump_syscall(env);
-        env->nip += 4;
-        new_msr |= env->msr & ((target_ulong)1 << MSR_EE);
-        new_msr |= env->msr & ((target_ulong)1 << MSR_RI);
-
-        vector += lev * 0x20;
-
-        env->lr = env->nip;
-        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                    */
@@ -1049,12 +1018,6 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
     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) {
@@ -1075,87 +1038,8 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
             }
         }
         break;
-    case POWERPC_EXCP_DSEG:      /* Data segment exception                   */
-    case POWERPC_EXCP_ISEG:      /* Instruction segment exception            */
-    case POWERPC_EXCP_TRACE:     /* Trace exception                          */
-        break;
-    case POWERPC_EXCP_HISI:      /* Hypervisor instruction storage exception */
-        msr |= env->error_code;
-        /* 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                */
-        srr0 = SPR_HSRR0;
-        srr1 = SPR_HSRR1;
-        new_msr |= (target_ulong)MSR_HVB;
-        new_msr |= env->msr & ((target_ulong)1 << MSR_RI);
-        break;
-    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         */
         cpu_abort(cs, "%s exception not implemented\n",
                   powerpc_excp_name(excp));
         break;
@@ -1177,41 +1061,20 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
         }
     }
 
-    /*
-     * Sort out endianness of interrupt, this differs depending on the
-     * CPU, the HV mode, etc...
-     */
-    if (ppc_interrupts_little_endian(cpu, !!(new_msr & MSR_HVB))) {
-        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;
-        }
+    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 {
-        if (!msr_isf && !mmu_is_64bit(env->mmu_model)) {
-            vector = (uint32_t)vector;
-        } else {
-            new_msr |= (target_ulong)1 << MSR_SF;
-        }
+        vector = (uint32_t)vector;
     }
 #endif
 
-    if (excp != POWERPC_EXCP_SYSCALL_VECTORED) {
-        /* Save PC */
-        env->spr[srr0] = env->nip;
-
-        /* Save MSR */
-        env->spr[srr1] = msr;
-    }
+    /* Save PC */
+    env->spr[srr0] = env->nip;
 
-    /* This can update new_msr and vector if AIL applies */
-    ppc_excp_apply_ail(cpu, excp_model, excp, msr, &new_msr, &vector);
+    /* Save MSR */
+    env->spr[srr1] = msr;
 
     powerpc_set_excp_state(cpu, vector, new_msr);
 }