target/*helper: don't check retaddr before calling cpu_restore_state

cpu_restore_state officially supports being passed an address it can't
resolve the state for. As a result the checks in the helpers are
superfluous and can be removed. This makes the code consistent with
other users of cpu_restore_state.

Of course this does nothing to address what to do if cpu_restore_state
can't resolve the state but so far it seems this is handled elsewhere.

The change was made with included coccinelle script.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
[rth: Fixed up comment indentation.  Added second hunk to script to
combine cpu_restore_state and cpu_loop_exit.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

scripts/coccinelle/cpu_restore_state.cocci

@@ -0,0 +1,19 @@
+// Remove unneeded tests before calling cpu_restore_state
+//
+// spatch --macro-file scripts/cocci-macro-file.h \
+//        --sp-file ./scripts/coccinelle/cpu_restore_state.cocci \
+//        --keep-comments --in-place --use-gitgrep --dir target
+@@
+expression A;
+expression C;
+@@
+-if (A) {
+     cpu_restore_state(C, A);
+-}
+@@
+expression A;
+expression C;
+@@
+- cpu_restore_state(C, A);
+- cpu_loop_exit(C);
++ cpu_loop_exit_restore(C, A);

target/alpha/mem_helper.c

@@ -34,9 +34,7 @@ void alpha_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
     uint64_t pc;
     uint32_t insn;
 
-    if (retaddr) {
+    cpu_restore_state(cs, retaddr);
-        cpu_restore_state(cs, retaddr);
-    }
 
     pc = env->pc;
     insn = cpu_ldl_code(env, pc);
@@ -58,9 +56,7 @@ void alpha_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
     AlphaCPU *cpu = ALPHA_CPU(cs);
     CPUAlphaState *env = &cpu->env;
 
-    if (retaddr) {
+    cpu_restore_state(cs, retaddr);
-        cpu_restore_state(cs, retaddr);
-    }
 
     env->trap_arg0 = addr;
     env->trap_arg1 = access_type == MMU_DATA_STORE ? 1 : 0;
@@ -80,11 +76,8 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
 
     ret = alpha_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
     if (unlikely(ret != 0)) {
-        if (retaddr) {
-            cpu_restore_state(cs, retaddr);
-        }
         /* Exception index and error code are already set */
-        cpu_loop_exit(cs);
+        cpu_loop_exit_restore(cs, retaddr);
     }
 }
 #endif /* CONFIG_USER_ONLY */

target/arm/op_helper.c

@@ -182,10 +182,8 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
     if (unlikely(ret)) {
         ARMCPU *cpu = ARM_CPU(cs);
 
-        if (retaddr) {
+        /* now we have a real cpu fault */
-            /* now we have a real cpu fault */
+        cpu_restore_state(cs, retaddr);
-            cpu_restore_state(cs, retaddr);
-        }
 
         deliver_fault(cpu, addr, access_type, mmu_idx, &fi);
     }
@@ -199,10 +197,8 @@ void arm_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr,
     ARMCPU *cpu = ARM_CPU(cs);
     ARMMMUFaultInfo fi = {};
 
-    if (retaddr) {
+    /* now we have a real cpu fault */
-        /* now we have a real cpu fault */
+    cpu_restore_state(cs, retaddr);
-        cpu_restore_state(cs, retaddr);
-    }
 
     fi.type = ARMFault_Alignment;
     deliver_fault(cpu, vaddr, access_type, mmu_idx, &fi);
@@ -221,10 +217,8 @@ void arm_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
     ARMCPU *cpu = ARM_CPU(cs);
     ARMMMUFaultInfo fi = {};
 
-    if (retaddr) {
+    /* now we have a real cpu fault */
-        /* now we have a real cpu fault */
+    cpu_restore_state(cs, retaddr);
-        cpu_restore_state(cs, retaddr);
-    }
 
     /* The EA bit in syndromes and fault status registers is an
      * IMPDEF classification of external aborts. ARM implementations

target/i386/svm_helper.c

@@ -584,9 +584,7 @@ void cpu_vmexit(CPUX86State *env, uint32_t exit_code, uint64_t exit_info_1,
 {
     CPUState *cs = CPU(x86_env_get_cpu(env));
 
-    if (retaddr) {
+    cpu_restore_state(cs, retaddr);
-        cpu_restore_state(cs, retaddr);
-    }
 
     qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmexit(%08x, %016" PRIx64 ", %016"
                   PRIx64 ", " TARGET_FMT_lx ")!\n",

target/lm32/op_helper.c

@@ -151,11 +151,8 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
 
     ret = lm32_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
     if (unlikely(ret)) {
-        if (retaddr) {
+        /* now we have a real cpu fault */
-            /* now we have a real cpu fault */
+        cpu_loop_exit_restore(cs, retaddr);
-            cpu_restore_state(cs, retaddr);
-        }
-        cpu_loop_exit(cs);
     }
 }
 #endif

target/m68k/op_helper.c

@@ -46,11 +46,8 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
 
     ret = m68k_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
     if (unlikely(ret)) {
-        if (retaddr) {
+        /* now we have a real cpu fault */
-            /* now we have a real cpu fault */
+        cpu_loop_exit_restore(cs, retaddr);
-            cpu_restore_state(cs, retaddr);
-        }
-        cpu_loop_exit(cs);
     }
 }
 

target/microblaze/op_helper.c

@@ -40,11 +40,8 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
 
     ret = mb_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
     if (unlikely(ret)) {
-        if (retaddr) {
+        /* now we have a real cpu fault */
-            /* now we have a real cpu fault */
+        cpu_loop_exit_restore(cs, retaddr);
-            cpu_restore_state(cs, retaddr);
-        }
-        cpu_loop_exit(cs);
     }
 }
 #endif

target/moxie/helper.c

@@ -36,9 +36,7 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
 
     ret = moxie_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
     if (unlikely(ret)) {
-        if (retaddr) {
+        cpu_restore_state(cs, retaddr);
-            cpu_restore_state(cs, retaddr);
-        }
     }
     cpu_loop_exit(cs);
 }

target/nios2/mmu.c

@@ -42,11 +42,8 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
 
     ret = nios2_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
     if (unlikely(ret)) {
-        if (retaddr) {
+        /* now we have a real cpu fault */
-            /* now we have a real cpu fault */
+        cpu_loop_exit_restore(cs, retaddr);
-            cpu_restore_state(cs, retaddr);
-        }
-        cpu_loop_exit(cs);
     }
 }
 

target/openrisc/mmu_helper.c

@@ -33,12 +33,8 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
     ret = openrisc_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
 
     if (ret) {
-        if (retaddr) {
-            /* now we have a real cpu fault.  */
-            cpu_restore_state(cs, retaddr);
-        }
         /* Raise Exception.  */
-        cpu_loop_exit(cs);
+        cpu_loop_exit_restore(cs, retaddr);
     }
 }
 #endif

target/tricore/op_helper.c

@@ -31,9 +31,7 @@ raise_exception_sync_internal(CPUTriCoreState *env, uint32_t class, int tin,
 {
     CPUState *cs = CPU(tricore_env_get_cpu(env));
     /* in case we come from a helper-call we need to restore the PC */
-    if (pc) {
+    cpu_restore_state(cs, pc);
-        cpu_restore_state(cs, pc);
-    }
 
     /* Tin is loaded into d[15] */
     env->gpr_d[15] = tin;
@@ -2804,13 +2802,8 @@ static inline void QEMU_NORETURN do_raise_exception_err(CPUTriCoreState *env,
     CPUState *cs = CPU(tricore_env_get_cpu(env));
     cs->exception_index = exception;
     env->error_code = error_code;
-
+    /* now we have a real cpu fault */
-    if (pc) {
+    cpu_loop_exit_restore(cs, pc);
-        /* now we have a real cpu fault */
-        cpu_restore_state(cs, pc);
-    }
-
-    cpu_loop_exit(cs);
 }
 
 void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,

target/unicore32/op_helper.c

@@ -251,11 +251,8 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
 
     ret = uc32_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
     if (unlikely(ret)) {
-        if (retaddr) {
+        /* now we have a real cpu fault */
-            /* now we have a real cpu fault */
+        cpu_loop_exit_restore(cs, retaddr);
-            cpu_restore_state(cs, retaddr);
-        }
-        cpu_loop_exit(cs);
     }
 }
 #endif