[PATCH v4 07/18] target/s390x: Return exception from mmu_translate_real

[Richard Henderson <richard.henderson@linaro.org>]

Do not raise the exception directly within mmu_translate_real,
but pass it back so that caller may do so.

Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/s390x/internal.h    |  2 +-
 target/s390x/excp_helper.c |  4 ++--
 target/s390x/mmu_helper.c  | 15 ++++++---------
 3 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/target/s390x/internal.h b/target/s390x/internal.h
index c243fa725b..c4388aaf23 100644
--- a/target/s390x/internal.h
+++ b/target/s390x/internal.h
@@ -362,7 +362,7 @@ void probe_write_access(CPUS390XState *env, uint64_t addr, uint64_t len,
 int mmu_translate(CPUS390XState *env, target_ulong vaddr, int rw, uint64_t asc,
                   target_ulong *raddr, int *flags, bool exc);
 int mmu_translate_real(CPUS390XState *env, target_ulong raddr, int rw,
-                       target_ulong *addr, int *flags);
+                       target_ulong *addr, int *flags, uint64_t *tec);
 
 
 /* misc_helper.c */
diff --git a/target/s390x/excp_helper.c b/target/s390x/excp_helper.c
index ab2ed47fef..906b87c071 100644
--- a/target/s390x/excp_helper.c
+++ b/target/s390x/excp_helper.c
@@ -147,8 +147,8 @@ bool s390_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
         if (!(env->psw.mask & PSW_MASK_64)) {
             vaddr &= 0x7fffffff;
         }
-        fail = mmu_translate_real(env, vaddr, access_type, &raddr, &prot);
-        excp = 0; /* exception already raised */
+        excp = mmu_translate_real(env, vaddr, access_type, &raddr, &prot, &tec);
+        fail = excp;
     } else {
         g_assert_not_reached();
     }
diff --git a/target/s390x/mmu_helper.c b/target/s390x/mmu_helper.c
index a142663b0f..48ebc62497 100644
--- a/target/s390x/mmu_helper.c
+++ b/target/s390x/mmu_helper.c
@@ -555,15 +555,11 @@ void s390_cpu_virt_mem_handle_exc(S390CPU *cpu, uintptr_t ra)
  * @param rw     0 = read, 1 = write, 2 = code fetch
  * @param addr   the translated address is stored to this pointer
  * @param flags  the PAGE_READ/WRITE/EXEC flags are stored to this pointer
- * @return       0 if the translation was successful, < 0 if a fault occurred
+ * @return       0 = success, != 0, the exception to raise
  */
 int mmu_translate_real(CPUS390XState *env, target_ulong raddr, int rw,
-                       target_ulong *addr, int *flags)
+                       target_ulong *addr, int *flags, uint64_t *tec)
 {
-    /* Code accesses have an undefined ilc, let's use 2 bytes. */
-    const int ilen = (rw == MMU_INST_FETCH) ? 2 : ILEN_AUTO;
-    uint64_t tec = (raddr & TARGET_PAGE_MASK) |
-                   (rw == MMU_DATA_STORE ? FS_WRITE : FS_READ);
     const bool lowprot_enabled = env->cregs[0] & CR0_LOWPROT;
 
     *flags = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
@@ -572,9 +568,10 @@ int mmu_translate_real(CPUS390XState *env, target_ulong raddr, int rw,
         *flags |= PAGE_WRITE_INV;
         if (is_low_address(raddr) && rw == MMU_DATA_STORE) {
             /* LAP sets bit 56 */
-            tec |= 0x80;
-            trigger_access_exception(env, PGM_PROTECTION, ilen, tec);
-            return -EACCES;
+            *tec = (raddr & TARGET_PAGE_MASK)
+                 | (rw == MMU_DATA_STORE ? FS_WRITE : FS_READ)
+                 | 0x80;
+            return PGM_PROTECTION;
         }
     }
 
-- 
2.17.1