target/m68k: Convert to CPUClass::tlb_fill

Backports commit fe5f7b1b3a2317f598687218c348b54e02a75e1f from qemu

qemu/target/m68k/cpu.c

@@ -251,7 +251,7 @@ static void m68k_cpu_class_init(struct uc_struct *uc, ObjectClass *c, void *data
     cc->do_interrupt = m68k_cpu_do_interrupt;
     cc->cpu_exec_interrupt = m68k_cpu_exec_interrupt;
     cc->set_pc = m68k_cpu_set_pc;
-    cc->handle_mmu_fault = m68k_cpu_handle_mmu_fault;
+    cc->tlb_fill = m68k_cpu_tlb_fill;
 #if defined(CONFIG_SOFTMMU)
     cc->do_unassigned_access = m68k_cpu_unassigned_access;
     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;

qemu/target/m68k/cpu.h

@@ -537,8 +537,9 @@ static inline int cpu_mmu_index (CPUM68KState *env, bool ifetch)
     return (env->sr & SR_S) == 0 ? 1 : 0;
 }
 
-int m68k_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int size, int rw,
+bool m68k_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
-                              int mmu_idx);
+                       MMUAccessType access_type, int mmu_idx,
+                       bool probe, uintptr_t retaddr);
 void m68k_cpu_unassigned_access(CPUState *cs, hwaddr addr,
                                 bool is_write, bool is_exec, int is_asi,
                                 unsigned size);

qemu/target/m68k/helper.c

@@ -214,20 +214,7 @@ void m68k_switch_sp(CPUM68KState *env)
     env->current_sp = new_sp;
 }
 
-#if defined(CONFIG_USER_ONLY)
+#if !defined(CONFIG_USER_ONLY)
-
-int m68k_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
-                              int mmu_idx)
-{
-    M68kCPU *cpu = M68K_CPU(cs->uc, cs);
-
-    cs->exception_index = EXCP_ACCESS;
-    cpu->env.mmu.ar = address;
-    return 1;
-}
-
-#else
-
 /* MMU: 68040 only */
 
 static int check_TTR(uint32_t ttr, int *prot, target_ulong addr,
@@ -441,11 +428,36 @@ hwaddr m68k_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
     return phys_addr;
 }
 
-int m68k_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
+/*
-                              int mmu_idx)
+ * Notify CPU of a pending interrupt.  Prioritization and vectoring should
+ * be handled by the interrupt controller.  Real hardware only requests
+ * the vector when the interrupt is acknowledged by the CPU.  For
+ * simplicity we calculate it when the interrupt is signalled.
+ */
+void m68k_set_irq_level(M68kCPU *cpu, int level, uint8_t vector)
+{
+    CPUState *cs = CPU(cpu);
+    CPUM68KState *env = &cpu->env;
+
+    env->pending_level = level;
+    env->pending_vector = vector;
+    if (level) {
+        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+    } else {
+        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+    }
+}
+
+#endif
+
+bool m68k_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
+                       MMUAccessType qemu_access_type, int mmu_idx,
+                       bool probe, uintptr_t retaddr)
 {
     M68kCPU *cpu = M68K_CPU(cs->uc, cs);
     CPUM68KState *env = &cpu->env;
+
+#ifndef CONFIG_USER_ONLY
     hwaddr physical;
     int prot;
     int access_type;
@@ -458,32 +470,35 @@ int m68k_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
                      address & TARGET_PAGE_MASK,
                      PAGE_READ | PAGE_WRITE | PAGE_EXEC,
                      mmu_idx, TARGET_PAGE_SIZE);
-        return 0;
+        return true;
     }
 
-    if (rw == 2) {
+    if (qemu_access_type == MMU_INST_FETCH) {
         access_type = ACCESS_CODE;
-        rw = 0;
     } else {
         access_type = ACCESS_DATA;
-        if (rw) {
+        if (qemu_access_type == MMU_DATA_STORE) {
             access_type |= ACCESS_STORE;
         }
     }
-
     if (mmu_idx != MMU_USER_IDX) {
         access_type |= ACCESS_SUPER;
     }
 
     ret = get_physical_address(&cpu->env, &physical, &prot,
                                address, access_type, &page_size);
-    if (ret == 0) {
+    if (likely(ret == 0)) {
         address &= TARGET_PAGE_MASK;
         physical += address & (page_size - 1);
         tlb_set_page(cs, address, physical,
                      prot, mmu_idx, TARGET_PAGE_SIZE);
-        return 0;
+        return true;
     }
+
+    if (probe) {
+        return false;
+    }
+
     /* page fault */
     env->mmu.ssw = M68K_ATC_040;
     switch (size) {
@@ -508,29 +523,19 @@ int m68k_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
     if (!(access_type & ACCESS_STORE)) {
         env->mmu.ssw |= M68K_RW_040;
     }
-    env->mmu.ar = address;
+#endif
+
     cs->exception_index = EXCP_ACCESS;
-    return 1;
+    env->mmu.ar = address;
+    cpu_loop_exit_restore(cs, retaddr);
 }
 
-/* Notify CPU of a pending interrupt.  Prioritization and vectoring should
+#ifndef CONFIG_USER_ONLY
-   be handled by the interrupt controller.  Real hardware only requests
+void tlb_fill(CPUState *cs, target_ulong addr, int size,
-   the vector when the interrupt is acknowledged by the CPU.  For
+              MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
-   simplicitly we calculate it when the interrupt is signalled.  */
-void m68k_set_irq_level(M68kCPU *cpu, int level, uint8_t vector)
 {
-    CPUState *cs = CPU(cpu);
+    m68k_cpu_tlb_fill(cs, addr, size, access_type, mmu_idx, false, retaddr);
-    CPUM68KState *env = &cpu->env;
-
-    env->pending_level = level;
-    env->pending_vector = vector;
-    if (level) {
-        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
-    } else {
-        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
-    }
 }
-
 #endif
 
 uint32_t HELPER(bitrev)(uint32_t x)

qemu/target/m68k/op_helper.c

@@ -37,21 +37,6 @@ static inline void do_interrupt_m68k_hardirq(CPUM68KState *env)
 
 extern int semihosting_enabled;
 
-/* Try to fill the TLB and return an exception if error. If retaddr is
-   NULL, it means that the function was called in C code (i.e. not
-   from generated code or from helper.c) */
-void tlb_fill(CPUState *cs, target_ulong addr, int size,
-              MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
-{
-    int ret;
-
-    ret = m68k_cpu_handle_mmu_fault(cs, addr, size, access_type, mmu_idx);
-    if (unlikely(ret)) {
-        /* now we have a real cpu fault */
-        cpu_loop_exit_restore(cs, retaddr);
-    }
-}
-
 static void cf_rte(CPUM68KState *env)
 {
     uint32_t sp;