Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20190510' into staging

Add CPUClass::tlb_fill.
Improve tlb_vaddr_to_host for use by ARM SVE no-fault loads.

# gpg: Signature made Fri 10 May 2019 19:48:37 BST
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-tcg-20190510: (27 commits)
  tcg: Use tlb_fill probe from tlb_vaddr_to_host
  tcg: Remove CPUClass::handle_mmu_fault
  tcg: Use CPUClass::tlb_fill in cputlb.c
  target/xtensa: Convert to CPUClass::tlb_fill
  target/unicore32: Convert to CPUClass::tlb_fill
  target/tricore: Convert to CPUClass::tlb_fill
  target/tilegx: Convert to CPUClass::tlb_fill
  target/sparc: Convert to CPUClass::tlb_fill
  target/sh4: Convert to CPUClass::tlb_fill
  target/s390x: Convert to CPUClass::tlb_fill
  target/riscv: Convert to CPUClass::tlb_fill
  target/ppc: Convert to CPUClass::tlb_fill
  target/openrisc: Convert to CPUClass::tlb_fill
  target/nios2: Convert to CPUClass::tlb_fill
  target/moxie: Convert to CPUClass::tlb_fill
  target/mips: Convert to CPUClass::tlb_fill
  target/mips: Tidy control flow in mips_cpu_handle_mmu_fault
  target/mips: Pass a valid error to raise_mmu_exception for user-only
  target/microblaze: Convert to CPUClass::tlb_fill
  target/m68k: Convert to CPUClass::tlb_fill
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

4 files changed, 85 insertions, 107 deletions

diff --git a/target/nios2/cpu.c b/target/nios2/cpu.c
index fbfaa2c..186af49 100644
--- a/target/nios2/cpu.c
+++ b/target/nios2/cpu.c
@@ -200,9 +200,8 @@ static void nios2_cpu_class_init(ObjectClass *oc, void *data)
     cc->dump_state = nios2_cpu_dump_state;
     cc->set_pc = nios2_cpu_set_pc;
     cc->disas_set_info = nios2_cpu_disas_set_info;
-#ifdef CONFIG_USER_ONLY
-    cc->handle_mmu_fault = nios2_cpu_handle_mmu_fault;
-#else
+    cc->tlb_fill = nios2_cpu_tlb_fill;
+#ifndef CONFIG_USER_ONLY
     cc->do_unaligned_access = nios2_cpu_do_unaligned_access;
     cc->get_phys_page_debug = nios2_cpu_get_phys_page_debug;
 #endif
diff --git a/target/nios2/cpu.h b/target/nios2/cpu.h
index adc9072..35d3886 100644
--- a/target/nios2/cpu.h
+++ b/target/nios2/cpu.h
@@ -253,8 +253,9 @@ static inline int cpu_mmu_index(CPUNios2State *env, bool ifetch)
                                                   MMU_SUPERVISOR_IDX;
 }
 
-int nios2_cpu_handle_mmu_fault(CPUState *env, vaddr address, int size,
-                               int rw, int mmu_idx);
+bool nios2_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
+                        MMUAccessType access_type, int mmu_idx,
+                        bool probe, uintptr_t retaddr);
 
 static inline int cpu_interrupts_enabled(CPUNios2State *env)
 {
diff --git a/target/nios2/helper.c b/target/nios2/helper.c
index e01fc1f..ffb83fc 100644
--- a/target/nios2/helper.c
+++ b/target/nios2/helper.c
@@ -38,15 +38,12 @@ void nios2_cpu_do_interrupt(CPUState *cs)
     env->regs[R_EA] = env->regs[R_PC] + 4;
 }
 
-int nios2_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size,
-                               int rw, int mmu_idx)
+bool nios2_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
+                        MMUAccessType access_type, int mmu_idx,
+                        bool probe, uintptr_t retaddr)
 {
     cs->exception_index = 0xaa;
-    /* Page 0x1000 is kuser helper */
-    if (address < 0x1000 || address >= 0x2000) {
-        cpu_dump_state(cs, stderr, 0);
-    }
-    return 1;
+    cpu_loop_exit_restore(cs, retaddr);
 }
 
 #else /* !CONFIG_USER_ONLY */
@@ -203,89 +200,6 @@ void nios2_cpu_do_interrupt(CPUState *cs)
     }
 }
 
-static int cpu_nios2_handle_virtual_page(
-    CPUState *cs, target_ulong address, int rw, int mmu_idx)
-{
-    Nios2CPU *cpu = NIOS2_CPU(cs);
-    CPUNios2State *env = &cpu->env;
-    target_ulong vaddr, paddr;
-    Nios2MMULookup lu;
-    unsigned int hit;
-    hit = mmu_translate(env, &lu, address, rw, mmu_idx);
-    if (hit) {
-        vaddr = address & TARGET_PAGE_MASK;
-        paddr = lu.paddr + vaddr - lu.vaddr;
-
-        if (((rw == 0) && (lu.prot & PAGE_READ)) ||
-            ((rw == 1) && (lu.prot & PAGE_WRITE)) ||
-            ((rw == 2) && (lu.prot & PAGE_EXEC))) {
-
-            tlb_set_page(cs, vaddr, paddr, lu.prot,
-                         mmu_idx, TARGET_PAGE_SIZE);
-            return 0;
-        } else {
-            /* Permission violation */
-            cs->exception_index = (rw == 0) ? EXCP_TLBR :
-                                               ((rw == 1) ? EXCP_TLBW :
-                                                            EXCP_TLBX);
-        }
-    } else {
-        cs->exception_index = EXCP_TLBD;
-    }
-
-    if (rw == 2) {
-        env->regs[CR_TLBMISC] &= ~CR_TLBMISC_D;
-    } else {
-        env->regs[CR_TLBMISC] |= CR_TLBMISC_D;
-    }
-    env->regs[CR_PTEADDR] &= CR_PTEADDR_PTBASE_MASK;
-    env->regs[CR_PTEADDR] |= (address >> 10) & CR_PTEADDR_VPN_MASK;
-    env->mmu.pteaddr_wr = env->regs[CR_PTEADDR];
-    env->regs[CR_BADADDR] = address;
-    return 1;
-}
-
-int nios2_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size,
-                               int rw, int mmu_idx)
-{
-    Nios2CPU *cpu = NIOS2_CPU(cs);
-    CPUNios2State *env = &cpu->env;
-
-    if (cpu->mmu_present) {
-        if (MMU_SUPERVISOR_IDX == mmu_idx) {
-            if (address >= 0xC0000000) {
-                /* Kernel physical page - TLB bypassed */
-                address &= TARGET_PAGE_MASK;
-                tlb_set_page(cs, address, address, PAGE_BITS,
-                             mmu_idx, TARGET_PAGE_SIZE);
-            } else if (address >= 0x80000000) {
-                /* Kernel virtual page */
-                return cpu_nios2_handle_virtual_page(cs, address, rw, mmu_idx);
-            } else {
-                /* User virtual page */
-                return cpu_nios2_handle_virtual_page(cs, address, rw, mmu_idx);
-            }
-        } else {
-            if (address >= 0x80000000) {
-                /* Illegal access from user mode */
-                cs->exception_index = EXCP_SUPERA;
-                env->regs[CR_BADADDR] = address;
-                return 1;
-            } else {
-                /* User virtual page */
-                return cpu_nios2_handle_virtual_page(cs, address, rw, mmu_idx);
-            }
-        }
-    } else {
-        /* No MMU */
-        address &= TARGET_PAGE_MASK;
-        tlb_set_page(cs, address, address, PAGE_BITS,
-                     mmu_idx, TARGET_PAGE_SIZE);
-    }
-
-    return 0;
-}
-
 hwaddr nios2_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
 {
     Nios2CPU *cpu = NIOS2_CPU(cs);
@@ -321,4 +235,80 @@ void nios2_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
     env->regs[CR_EXCEPTION] = EXCP_UNALIGN << 2;
     helper_raise_exception(env, EXCP_UNALIGN);
 }
+
+bool nios2_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
+                        MMUAccessType access_type, int mmu_idx,
+                        bool probe, uintptr_t retaddr)
+{
+    Nios2CPU *cpu = NIOS2_CPU(cs);
+    CPUNios2State *env = &cpu->env;
+    unsigned int excp = EXCP_TLBD;
+    target_ulong vaddr, paddr;
+    Nios2MMULookup lu;
+    unsigned int hit;
+
+    if (!cpu->mmu_present) {
+        /* No MMU */
+        address &= TARGET_PAGE_MASK;
+        tlb_set_page(cs, address, address, PAGE_BITS,
+                     mmu_idx, TARGET_PAGE_SIZE);
+        return true;
+    }
+
+    if (MMU_SUPERVISOR_IDX == mmu_idx) {
+        if (address >= 0xC0000000) {
+            /* Kernel physical page - TLB bypassed */
+            address &= TARGET_PAGE_MASK;
+            tlb_set_page(cs, address, address, PAGE_BITS,
+                         mmu_idx, TARGET_PAGE_SIZE);
+            return true;
+        }
+    } else {
+        if (address >= 0x80000000) {
+            /* Illegal access from user mode */
+            if (probe) {
+                return false;
+            }
+            cs->exception_index = EXCP_SUPERA;
+            env->regs[CR_BADADDR] = address;
+            cpu_loop_exit_restore(cs, retaddr);
+        }
+    }
+
+    /* Virtual page.  */
+    hit = mmu_translate(env, &lu, address, access_type, mmu_idx);
+    if (hit) {
+        vaddr = address & TARGET_PAGE_MASK;
+        paddr = lu.paddr + vaddr - lu.vaddr;
+
+        if (((access_type == MMU_DATA_LOAD) && (lu.prot & PAGE_READ)) ||
+            ((access_type == MMU_DATA_STORE) && (lu.prot & PAGE_WRITE)) ||
+            ((access_type == MMU_INST_FETCH) && (lu.prot & PAGE_EXEC))) {
+            tlb_set_page(cs, vaddr, paddr, lu.prot,
+                         mmu_idx, TARGET_PAGE_SIZE);
+            return true;
+        }
+
+        /* Permission violation */
+        excp = (access_type == MMU_DATA_LOAD ? EXCP_TLBR :
+                access_type == MMU_DATA_STORE ? EXCP_TLBW : EXCP_TLBX);
+    }
+
+    if (probe) {
+        return false;
+    }
+
+    if (access_type == MMU_INST_FETCH) {
+        env->regs[CR_TLBMISC] &= ~CR_TLBMISC_D;
+    } else {
+        env->regs[CR_TLBMISC] |= CR_TLBMISC_D;
+    }
+    env->regs[CR_PTEADDR] &= CR_PTEADDR_PTBASE_MASK;
+    env->regs[CR_PTEADDR] |= (address >> 10) & CR_PTEADDR_VPN_MASK;
+    env->mmu.pteaddr_wr = env->regs[CR_PTEADDR];
+
+    cs->exception_index = excp;
+    env->regs[CR_BADADDR] = address;
+    cpu_loop_exit_restore(cs, retaddr);
+}
 #endif /* !CONFIG_USER_ONLY */
diff --git a/target/nios2/mmu.c b/target/nios2/mmu.c
index 5acf442..47fa474 100644
--- a/target/nios2/mmu.c
+++ b/target/nios2/mmu.c
@@ -36,18 +36,6 @@
 #define MMU_LOG(x)
 #endif
 
-void tlb_fill(CPUState *cs, target_ulong addr, int size,
-              MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
-{
-    int ret;
-
-    ret = nios2_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);
-    }
-}
-
 void mmu_read_debug(CPUNios2State *env, uint32_t rn)
 {
     switch (rn) {