ppc: Don't update NIP in facility unavailable interrupts

This is no longer necessary as the helpers will properly retrieve
the return address when needed. Also remove gen_update_current_nip()
which didn't seem to make much sense to me.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

target-ppc/cpu.h

@@ -1202,7 +1202,6 @@ extern const struct VMStateDescription vmstate_ppc_cpu;
 PowerPCCPU *cpu_ppc_init(const char *cpu_model);
 void ppc_translate_init(void);
 const char *ppc_cpu_lookup_alias(const char *alias);
-void gen_update_current_nip(void *opaque);
 /* you can call this signal handler from your SIGBUS and SIGSEGV
    signal handlers to inform the virtual CPU of exceptions. non zero
    is returned if the signal was handled by the virtual CPU.  */

target-ppc/misc_helper.c

@@ -39,15 +39,16 @@ void helper_store_dump_spr(CPUPPCState *env, uint32_t sprn)
 
 #ifdef TARGET_PPC64
 static void raise_fu_exception(CPUPPCState *env, uint32_t bit,
-                               uint32_t sprn, uint32_t cause)
+                               uint32_t sprn, uint32_t cause,
+                               uintptr_t raddr)
 {
     qemu_log("Facility SPR %d is unavailable (SPR FSCR:%d)\n", sprn, bit);
 
     env->spr[SPR_FSCR] &= ~((target_ulong)FSCR_IC_MASK << FSCR_IC_POS);
     cause &= FSCR_IC_MASK;
     env->spr[SPR_FSCR] |= (target_ulong)cause << FSCR_IC_POS;
 
-    helper_raise_exception_err(env, POWERPC_EXCP_FU, 0);
+    raise_exception_err_ra(env, POWERPC_EXCP_FU, 0, raddr);
 }
 #endif
 
@@ -59,7 +60,7 @@ void helper_fscr_facility_check(CPUPPCState *env, uint32_t bit,
         /* Facility is enabled, continue */
         return;
     }
-    raise_fu_exception(env, bit, sprn, cause);
+    raise_fu_exception(env, bit, sprn, cause, GETPC());
 #endif
 }
 
@@ -71,7 +72,7 @@ void helper_msr_facility_check(CPUPPCState *env, uint32_t bit,
         /* Facility is enabled, continue */
         return;
     }
-    raise_fu_exception(env, bit, sprn, cause);
+    raise_fu_exception(env, bit, sprn, cause, GETPC());
 #endif
 }
 

target-ppc/translate.c

@@ -266,13 +266,6 @@ static inline void gen_update_nip(DisasContext *ctx, target_ulong nip)
     tcg_gen_movi_tl(cpu_nip, nip);
 }
 
-void gen_update_current_nip(void *opaque)
-{
-    DisasContext *ctx = opaque;
-
-    tcg_gen_movi_tl(cpu_nip, ctx->nip);
-}
-
 static void gen_exception_err(DisasContext *ctx, uint32_t excp, uint32_t error)
 {
     TCGv_i32 t0, t1;

target-ppc/translate_init.c

@@ -7470,7 +7470,6 @@ static void gen_fscr_facility_check(DisasContext *ctx, int facility_sprn,
     TCGv_i32 t2 = tcg_const_i32(sprn);
     TCGv_i32 t3 = tcg_const_i32(cause);
 
-    gen_update_current_nip(ctx);
     gen_helper_fscr_facility_check(cpu_env, t1, t2, t3);
 
     tcg_temp_free_i32(t3);
@@ -7485,7 +7484,6 @@ static void gen_msr_facility_check(DisasContext *ctx, int facility_sprn,
     TCGv_i32 t2 = tcg_const_i32(sprn);
     TCGv_i32 t3 = tcg_const_i32(cause);
 
-    gen_update_current_nip(ctx);
     gen_helper_msr_facility_check(cpu_env, t1, t2, t3);
 
     tcg_temp_free_i32(t3);