linux-user/i386: Split out maybe_handle_vm86_trap

Reduce the number of ifdefs within cpu_loop().

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220107213243.212806-10-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/i386/cpu_loop.c

@@ -198,6 +198,17 @@ static void emulate_vsyscall(CPUX86State *env)
 }
 #endif
 
+static bool maybe_handle_vm86_trap(CPUX86State *env, int trapnr)
+{
+#ifndef TARGET_X86_64
+    if (env->eflags & VM_MASK) {
+        handle_vm86_trap(env, trapnr);
+        return true;
+    }
+#endif
+    return false;
+}
+
 void cpu_loop(CPUX86State *env)
 {
     CPUState *cs = env_cpu(env);
@@ -259,12 +270,9 @@ void cpu_loop(CPUX86State *env)
             break;
         case EXCP0D_GPF:
             /* XXX: potential problem if ABI32 */
-#ifndef TARGET_X86_64
-            if (env->eflags & VM_MASK) {
-                handle_vm86_fault(env);
+            if (maybe_handle_vm86_trap(env, trapnr)) {
                 break;
             }
-#endif
             gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0);
             break;
         case EXCP0E_PAGE:
@@ -274,22 +282,16 @@ void cpu_loop(CPUX86State *env)
                        env->cr[2]);
             break;
         case EXCP00_DIVZ:
-#ifndef TARGET_X86_64
-            if (env->eflags & VM_MASK) {
-                handle_vm86_trap(env, trapnr);
+            if (maybe_handle_vm86_trap(env, trapnr)) {
                 break;
             }
-#endif
             gen_signal(env, TARGET_SIGFPE, TARGET_FPE_INTDIV, env->eip);
             break;
         case EXCP01_DB:
         case EXCP03_INT3:
-#ifndef TARGET_X86_64
-            if (env->eflags & VM_MASK) {
-                handle_vm86_trap(env, trapnr);
+            if (maybe_handle_vm86_trap(env, trapnr)) {
                 break;
             }
-#endif
             if (trapnr == EXCP01_DB) {
                 gen_signal(env, TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->eip);
             } else {
@@ -298,12 +300,9 @@ void cpu_loop(CPUX86State *env)
             break;
         case EXCP04_INTO:
         case EXCP05_BOUND:
-#ifndef TARGET_X86_64
-            if (env->eflags & VM_MASK) {
-                handle_vm86_trap(env, trapnr);
+            if (maybe_handle_vm86_trap(env, trapnr)) {
                 break;
             }
-#endif
             gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0);
             break;
         case EXCP06_ILLOP: