[Qemu-devel] [PATCH 1/2] s390x: Diag308 move common parameter checking into function

[Janosch Frank <frankja@linux.ibm.com>]

Let's make that switch statement a bit shorter.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 target/s390x/diag.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/target/s390x/diag.c b/target/s390x/diag.c
index acb0f3d4af..cfd7222ddd 100644
--- a/target/s390x/diag.c
+++ b/target/s390x/diag.c
@@ -53,6 +53,22 @@ int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
 #define DIAG_308_RC_NO_CONF         0x0102
 #define DIAG_308_RC_INVALID         0x0402
 
+static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t addr,
+                              uintptr_t ra)
+{
+    if ((r1 & 1) || (addr & 0x0fffULL)) {
+        s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
+        return -EINVAL;
+    }
+    if (!address_space_access_valid(&address_space_memory, addr,
+                                    sizeof(IplParameterBlock), true,
+                                    MEMTXATTRS_UNSPECIFIED)) {
+        s390_program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO, ra);
+        return -EFAULT;
+    }
+    return 0;
+}
+
 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
 {
     CPUState *cs = CPU(s390_env_get_cpu(env));
@@ -81,14 +97,7 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
         s390_ipl_reset_request(cs, S390_RESET_REIPL);
         break;
     case 5:
-        if ((r1 & 1) || (addr & 0x0fffULL)) {
-            s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
-            return;
-        }
-        if (!address_space_access_valid(&address_space_memory, addr,
-                                        sizeof(IplParameterBlock), false,
-                                        MEMTXATTRS_UNSPECIFIED)) {
-            s390_program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO, ra);
+        if (diag308_parm_check(env, r1, addr, ra)) {
             return;
         }
         iplb = g_new0(IplParameterBlock, 1);
@@ -111,14 +120,7 @@ out:
         g_free(iplb);
         return;
     case 6:
-        if ((r1 & 1) || (addr & 0x0fffULL)) {
-            s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
-            return;
-        }
-        if (!address_space_access_valid(&address_space_memory, addr,
-                                        sizeof(IplParameterBlock), true,
-                                        MEMTXATTRS_UNSPECIFIED)) {
-            s390_program_interrupt(env, PGM_ADDRESSING, ILEN_AUTO, ra);
+        if (diag308_parm_check(env, r1, addr, ra)) {
             return;
         }
         iplb = s390_ipl_get_iplb();
-- 
2.14.3