microblaze: Trap on bus accesses to unmapped areas.

Signed-off-by: NEdgar E. Iglesias <edgar.iglesias@gmail.com>

exec.c

@@ -2492,7 +2492,7 @@ static uint32_t unassigned_mem_readb(void *opaque, target_phys_addr_t addr)
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
 #endif
-#if defined(TARGET_SPARC)
+#if defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 0, 0, 0, 1);
 #endif
     return 0;
@@ -2503,7 +2503,7 @@ static uint32_t unassigned_mem_readw(void *opaque, target_phys_addr_t addr)
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
 #endif
-#if defined(TARGET_SPARC)
+#if defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 0, 0, 0, 2);
 #endif
     return 0;
@@ -2514,7 +2514,7 @@ static uint32_t unassigned_mem_readl(void *opaque, target_phys_addr_t addr)
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
 #endif
-#if defined(TARGET_SPARC)
+#if defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 0, 0, 0, 4);
 #endif
     return 0;
@@ -2525,7 +2525,7 @@ static void unassigned_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%x\n", addr, val);
 #endif
-#if defined(TARGET_SPARC)
+#if defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 1, 0, 0, 1);
 #endif
 }
@@ -2535,7 +2535,7 @@ static void unassigned_mem_writew(void *opaque, target_phys_addr_t addr, uint32_
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%x\n", addr, val);
 #endif
-#if defined(TARGET_SPARC)
+#if defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 1, 0, 0, 2);
 #endif
 }
@@ -2545,7 +2545,7 @@ static void unassigned_mem_writel(void *opaque, target_phys_addr_t addr, uint32_
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%x\n", addr, val);
 #endif
-#if defined(TARGET_SPARC)
+#if defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 1, 0, 0, 4);
 #endif
 }

target-microblaze/cpu.h

@@ -323,4 +323,7 @@ static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
     env->iflags |= env->sregs[SR_MSR] & MSR_EE;
     *flags = env->iflags & IFLAGS_TB_MASK;
 }
+
+void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
+                          int is_asi, int size);
 #endif

target-microblaze/op_helper.c

@@ -245,3 +245,30 @@ void helper_mmu_write(uint32_t rn, uint32_t v)
     mmu_write(env, rn, v);
 }
 #endif
+
+void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
+                          int is_asi, int size)
+{
+    CPUState *saved_env;
+    /* XXX: hack to restore env in all cases, even if not called from
+       generated code */
+    saved_env = env;
+    env = cpu_single_env;
+    qemu_log("Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n",
+             addr, is_write, is_exec);
+    if (!(env->sregs[SR_MSR] & MSR_EE)) {
+        return;
+    }
+
+    if (is_exec) {
+        if (!(env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) {
+            env->sregs[SR_ESR] = ESR_EC_INSN_BUS;
+            helper_raise_exception(EXCP_HW_EXCP);
+        }
+    } else {
+        if (!(env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) {
+            env->sregs[SR_ESR] = ESR_EC_DATA_BUS;
+            helper_raise_exception(EXCP_HW_EXCP);
+        }
+    }
+}