diff --git a/exec-all.h b/exec-all.h
index 7c2d29f..6d3ae77 100644
--- a/exec-all.h
+++ b/exec-all.h
@@ -322,7 +322,7 @@ static inline tb_page_addr_t get_page_addr_code(CPUState *env1, target_ulong add
     }
     pd = env1->tlb_table[mmu_idx][page_index].addr_code & ~TARGET_PAGE_MASK;
     if (pd > IO_MEM_ROM && !(pd & IO_MEM_ROMD)) {
-#if defined(TARGET_SPARC) || defined(TARGET_MIPS)
+#if defined(TARGET_ALPHA) || defined(TARGET_MIPS) || defined(TARGET_SPARC)
         do_unassigned_access(addr, 0, 1, 0, 4);
 #else
         cpu_abort(env1, "Trying to execute code outside RAM or ROM at 0x" TARGET_FMT_lx "\n", addr);
diff --git a/exec.c b/exec.c
index c82ff70..c8b053f 100644
--- a/exec.c
+++ b/exec.c
@@ -3094,7 +3094,7 @@ 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) || defined(TARGET_MICROBLAZE)
+#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 0, 0, 0, 1);
 #endif
     return 0;
@@ -3105,7 +3105,7 @@ 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) || defined(TARGET_MICROBLAZE)
+#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 0, 0, 0, 2);
 #endif
     return 0;
@@ -3116,7 +3116,7 @@ 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) || defined(TARGET_MICROBLAZE)
+#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 0, 0, 0, 4);
 #endif
     return 0;
@@ -3127,7 +3127,7 @@ void unassigned_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%x\n", addr, val);
 #endif
-#if defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
+#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 1, 0, 0, 1);
 #endif
 }
@@ -3137,7 +3137,7 @@ void unassigned_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%x\n", addr, val);
 #endif
-#if defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
+#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 1, 0, 0, 2);
 #endif
 }
@@ -3147,7 +3147,7 @@ void unassigned_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 #ifdef DEBUG_UNASSIGNED
     printf("Unassigned mem write " TARGET_FMT_plx " = 0x%x\n", addr, val);
 #endif
-#if defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
+#if defined(TARGET_ALPHA) || defined(TARGET_SPARC) || defined(TARGET_MICROBLAZE)
     do_unassigned_access(addr, 1, 0, 0, 4);
 #endif
 }
diff --git a/target-alpha/cpu.h b/target-alpha/cpu.h
index bb76edb..59b3bc3 100644
--- a/target-alpha/cpu.h
+++ b/target-alpha/cpu.h
@@ -429,7 +429,11 @@ void do_interrupt (CPUState *env);
 
 uint64_t cpu_alpha_load_fpcr (CPUState *env);
 void cpu_alpha_store_fpcr (CPUState *env, uint64_t val);
-extern void swap_shadow_regs(CPUState *env);
+#ifndef CONFIG_USER_ONLY
+void swap_shadow_regs(CPUState *env);
+extern QEMU_NORETURN void do_unassigned_access(target_phys_addr_t addr,
+                                               int, int, int, int);
+#endif
 
 /* Bits in TB->FLAGS that control how translation is processed.  */
 enum {
diff --git a/target-alpha/op_helper.c b/target-alpha/op_helper.c
index 03b5091..91ef90a 100644
--- a/target-alpha/op_helper.c
+++ b/target-alpha/op_helper.c
@@ -1265,7 +1265,33 @@ uint64_t helper_stq_c_phys(uint64_t p, uint64_t v)
     return ret;
 }
 
+static void QEMU_NORETURN do_unaligned_access(target_ulong addr, int is_write,
+                                              int is_user, void *retaddr)
+{
+    uint64_t pc;
+    uint32_t insn;
+
+    do_restore_state(retaddr);
+
+    pc = env->pc;
+    insn = ldl_code(pc);
+
+    env->trap_arg0 = addr;
+    env->trap_arg1 = insn >> 26;                /* opcode */
+    env->trap_arg2 = (insn >> 21) & 31;         /* dest regno */
+    helper_excp(EXCP_UNALIGN, 0);
+}
+
+void QEMU_NORETURN do_unassigned_access(target_phys_addr_t addr, int is_write,
+                                        int is_exec, int unused, int size)
+{
+    env->trap_arg0 = addr;
+    env->trap_arg1 = is_write;
+    dynamic_excp(EXCP_MCHK, 0);
+}
+
 #define MMUSUFFIX _mmu
+#define ALIGNED_ONLY
 
 #define SHIFT 0
 #include "softmmu_template.h"
