[PATCH 1/2] target/m68k: implement do_unaligned_access callback for m68k CPUs

[Mark Cave-Ayland]

For m68k CPUs that do not support unaligned accesses, any such access should
cause the CPU to raise an Address Error exception.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>
---
 target/m68k/cpu.c       |  1 +
 target/m68k/cpu.h       |  4 ++++
 target/m68k/op_helper.c | 11 +++++++++++
 3 files changed, 16 insertions(+)

diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
index efd6bbded8..25e95f9f68 100644
--- a/target/m68k/cpu.c
+++ b/target/m68k/cpu.c
@@ -538,6 +538,7 @@ static const TCGCPUOps m68k_tcg_ops = {
     .cpu_exec_interrupt = m68k_cpu_exec_interrupt,
     .do_interrupt = m68k_cpu_do_interrupt,
     .do_transaction_failed = m68k_cpu_transaction_failed,
+    .do_unaligned_access = m68k_cpu_do_unaligned_access,
 #endif /* !CONFIG_USER_ONLY */
 };
 
diff --git a/target/m68k/cpu.h b/target/m68k/cpu.h
index b5bbeedb7a..d4c9531b1c 100644
--- a/target/m68k/cpu.h
+++ b/target/m68k/cpu.h
@@ -590,6 +590,10 @@ void m68k_cpu_transaction_failed(CPUState *cs, hwaddr 
physaddr, vaddr addr,
                                  unsigned size, MMUAccessType access_type,
                                  int mmu_idx, MemTxAttrs attrs,
                                  MemTxResult response, uintptr_t retaddr);
+G_NORETURN void m68k_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
+                                             MMUAccessType access_type,
+                                             int mmu_idx,
+                                             uintptr_t retaddr);
 #endif
 
 #include "exec/cpu-all.h"
diff --git a/target/m68k/op_helper.c b/target/m68k/op_helper.c
index 15bad5dd46..417b691d8d 100644
--- a/target/m68k/op_helper.c
+++ b/target/m68k/op_helper.c
@@ -558,6 +558,17 @@ raise_exception_format2(CPUM68KState *env, int tt, int 
ilen, uintptr_t raddr)
     cpu_loop_exit(cs);
 }
 
+#if !defined(CONFIG_USER_ONLY)
+G_NORETURN void m68k_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
+                                             MMUAccessType access_type,
+                                             int mmu_idx, uintptr_t retaddr)
+{
+    CPUM68KState *env = cpu_env(cs);
+
+    raise_exception(env, EXCP_ADDRESS);
+}
+#endif
+
 void HELPER(divuw)(CPUM68KState *env, int destr, uint32_t den, int ilen)
 {
     uint32_t num = env->dregs[destr];
-- 
2.39.2