target-xtensa: implement do_unassigned_access callback

Depending on access type raise either InstrPIFDataError or
LoadStorePIFDataError exception.
Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com>

target-xtensa/cpu-qom.h

@@ -85,6 +85,9 @@ static inline XtensaCPU *xtensa_env_get_cpu(const CPUXtensaState *env)
 
 void xtensa_cpu_do_interrupt(CPUState *cpu);
 bool xtensa_cpu_exec_interrupt(CPUState *cpu, int interrupt_request);
+void xtensa_cpu_do_unassigned_access(CPUState *cpu, hwaddr addr,
+                                     bool is_write, bool is_exec, int opaque,
+                                     unsigned size);
 void xtensa_cpu_dump_state(CPUState *cpu, FILE *f,
                            fprintf_function cpu_fprintf, int flags);
 hwaddr xtensa_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);

target-xtensa/cpu.c

@@ -151,6 +151,7 @@ static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
 #ifndef CONFIG_USER_ONLY
     cc->do_unaligned_access = xtensa_cpu_do_unaligned_access;
     cc->get_phys_page_debug = xtensa_cpu_get_phys_page_debug;
+    cc->do_unassigned_access = xtensa_cpu_do_unassigned_access;
 #endif
     cc->debug_excp_handler = xtensa_breakpoint_handler;
     dc->vmsd = &vmstate_xtensa_cpu;

target-xtensa/op_helper.c

@@ -71,6 +71,20 @@ void tlb_fill(CPUState *cs,
     }
 }
 
+void xtensa_cpu_do_unassigned_access(CPUState *cs, hwaddr addr,
+                                     bool is_write, bool is_exec, int opaque,
+                                     unsigned size)
+{
+    XtensaCPU *cpu = XTENSA_CPU(cs);
+    CPUXtensaState *env = &cpu->env;
+
+    HELPER(exception_cause_vaddr)(env, env->pc,
+                                  is_exec ?
+                                  INSTR_PIF_ADDR_ERROR_CAUSE :
+                                  LOAD_STORE_PIF_ADDR_ERROR_CAUSE,
+                                  is_exec ? addr : cs->mem_io_vaddr);
+}
+
 static void tb_invalidate_virtual_addr(CPUXtensaState *env, uint32_t vaddr)
 {
     uint32_t paddr;