target/m68k: Switch to transaction_failed hook

Switch the m68k target from the old unassigned_access hook
to the transaction_failed hook.

The notable difference is that rather than it being called
for all physical memory accesses which fail (including
those made by DMA devices or by the gdbstub), it is only
called for those made by the CPU via its MMU. (In previous
commits we put in explicit checks for the direct physical
loads made by the target/m68k code which will no longer
be handled by calling the unassigned_access hook.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20181210165636.28366-4-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

target/m68k/cpu.c

@@ -271,7 +271,7 @@ static void m68k_cpu_class_init(ObjectClass *c, void *data)
     cc->gdb_write_register = m68k_cpu_gdb_write_register;
     cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
 #if defined(CONFIG_SOFTMMU)
-    cc->do_unassigned_access = m68k_cpu_unassigned_access;
+    cc->do_transaction_failed = m68k_cpu_transaction_failed;
     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
 #endif
     cc->disas_set_info = m68k_cpu_disas_set_info;

target/m68k/cpu.h

@@ -544,9 +544,10 @@ static inline int cpu_mmu_index (CPUM68KState *env, bool ifetch)
 
 int m68k_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int size, int rw,
                               int mmu_idx);
-void m68k_cpu_unassigned_access(CPUState *cs, hwaddr addr,
-                                bool is_write, bool is_exec, int is_asi,
-                                unsigned size);
+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);
 
 #include "exec/cpu-all.h"
 

target/m68k/op_helper.c

@@ -454,19 +454,15 @@ static inline void do_interrupt_m68k_hardirq(CPUM68KState *env)
     do_interrupt_all(env, 1);
 }
 
-void m68k_cpu_unassigned_access(CPUState *cs, hwaddr addr, bool is_write,
-                                bool is_exec, int is_asi, unsigned size)
+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)
 {
     M68kCPU *cpu = M68K_CPU(cs);
     CPUM68KState *env = &cpu->env;
-#ifdef DEBUG_UNASSIGNED
-    qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n",
-             addr, is_write, is_exec);
-#endif
-    if (env == NULL) {
-        /* when called from gdb, env is NULL */
-        return;
-    }
+
+    cpu_restore_state(cs, retaddr, true);
 
     if (m68k_feature(env, M68K_FEATURE_M68040)) {
         env->mmu.mmusr = 0;
@@ -476,7 +472,7 @@ void m68k_cpu_unassigned_access(CPUState *cs, hwaddr addr, bool is_write,
         if (env->sr & SR_S) { /* SUPERVISOR */
             env->mmu.ssw |= M68K_TM_040_SUPER;
         }
-        if (is_exec) { /* instruction or data */
+        if (access_type == MMU_INST_FETCH) { /* instruction or data */
             env->mmu.ssw |= M68K_TM_040_CODE;
         } else {
             env->mmu.ssw |= M68K_TM_040_DATA;
@@ -494,7 +490,7 @@ void m68k_cpu_unassigned_access(CPUState *cs, hwaddr addr, bool is_write,
             break;
         }
 
-        if (!is_write) {
+        if (access_type != MMU_DATA_STORE) {
             env->mmu.ssw |= M68K_RW_040;
         }