[Qemu-devel] [PULL 20/27] target/sparc: Convert to CPUClass::tlb_fill

[Richard Henderson <richard.henderson@linaro.org>]

Cc: Artyom Tarasenko <atar4qemu@gmail.com>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/sparc/cpu.h         |  5 ++--
 target/sparc/cpu.c         |  5 ++--
 target/sparc/ldst_helper.c | 11 +-------
 target/sparc/mmu_helper.c  | 58 ++++++++++++++++++++++++--------------
 4 files changed, 43 insertions(+), 36 deletions(-)

diff --git a/target/sparc/cpu.h b/target/sparc/cpu.h
index 85b9665ccc..f31e8535df 100644
--- a/target/sparc/cpu.h
+++ b/target/sparc/cpu.h
@@ -579,8 +579,9 @@ void cpu_raise_exception_ra(CPUSPARCState *, int, uintptr_t) QEMU_NORETURN;
 void cpu_sparc_set_id(CPUSPARCState *env, unsigned int cpu);
 void sparc_cpu_list(void);
 /* mmu_helper.c */
-int sparc_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int size, int rw,
-                               int mmu_idx);
+bool sparc_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
+                        MMUAccessType access_type, int mmu_idx,
+                        bool probe, uintptr_t retaddr);
 target_ulong mmu_probe(CPUSPARCState *env, target_ulong address, int mmulev);
 void dump_mmu(CPUSPARCState *env);
 
diff --git a/target/sparc/cpu.c b/target/sparc/cpu.c
index 4654c2a6a0..f93ce72eb9 100644
--- a/target/sparc/cpu.c
+++ b/target/sparc/cpu.c
@@ -875,9 +875,8 @@ static void sparc_cpu_class_init(ObjectClass *oc, void *data)
     cc->synchronize_from_tb = sparc_cpu_synchronize_from_tb;
     cc->gdb_read_register = sparc_cpu_gdb_read_register;
     cc->gdb_write_register = sparc_cpu_gdb_write_register;
-#ifdef CONFIG_USER_ONLY
-    cc->handle_mmu_fault = sparc_cpu_handle_mmu_fault;
-#else
+    cc->tlb_fill = sparc_cpu_tlb_fill;
+#ifndef CONFIG_USER_ONLY
     cc->do_unassigned_access = sparc_cpu_unassigned_access;
     cc->do_unaligned_access = sparc_cpu_do_unaligned_access;
     cc->get_phys_page_debug = sparc_cpu_get_phys_page_debug;
diff --git a/target/sparc/ldst_helper.c b/target/sparc/ldst_helper.c
index a7fcb84ac0..2558c08a64 100644
--- a/target/sparc/ldst_helper.c
+++ b/target/sparc/ldst_helper.c
@@ -1925,18 +1925,9 @@ void QEMU_NORETURN sparc_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
     cpu_raise_exception_ra(env, TT_UNALIGNED, retaddr);
 }
 
-/* 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) */
-/* XXX: fix it to restore all registers */
 void tlb_fill(CPUState *cs, target_ulong addr, int size,
               MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
 {
-    int ret;
-
-    ret = sparc_cpu_handle_mmu_fault(cs, addr, size, access_type, mmu_idx);
-    if (ret) {
-        cpu_loop_exit_restore(cs, retaddr);
-    }
+    sparc_cpu_tlb_fill(cs, addr, size, access_type, mmu_idx, false, retaddr);
 }
 #endif
diff --git a/target/sparc/mmu_helper.c b/target/sparc/mmu_helper.c
index afcc5b617d..facc0c60e9 100644
--- a/target/sparc/mmu_helper.c
+++ b/target/sparc/mmu_helper.c
@@ -27,13 +27,14 @@
 
 #if defined(CONFIG_USER_ONLY)
 
-int sparc_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
-                               int mmu_idx)
+bool sparc_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
+                        MMUAccessType access_type, int mmu_idx,
+                        bool probe, uintptr_t retaddr)
 {
     SPARCCPU *cpu = SPARC_CPU(cs);
     CPUSPARCState *env = &cpu->env;
 
-    if (rw & 2) {
+    if (access_type == MMU_INST_FETCH) {
         cs->exception_index = TT_TFAULT;
     } else {
         cs->exception_index = TT_DFAULT;
@@ -43,7 +44,7 @@ int sparc_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
         env->mmuregs[4] = address;
 #endif
     }
-    return 1;
+    cpu_loop_exit_restore(cs, retaddr);
 }
 
 #else
@@ -208,8 +209,9 @@ static int get_physical_address(CPUSPARCState *env, hwaddr *physical,
 }
 
 /* Perform address translation */
-int sparc_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
-                               int mmu_idx)
+bool sparc_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
+                        MMUAccessType access_type, int mmu_idx,
+                        bool probe, uintptr_t retaddr)
 {
     SPARCCPU *cpu = SPARC_CPU(cs);
     CPUSPARCState *env = &cpu->env;
@@ -218,16 +220,26 @@ int sparc_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
     target_ulong page_size;
     int error_code = 0, prot, access_index;
 
+    /*
+     * TODO: If we ever need tlb_vaddr_to_host for this target,
+     * then we must figure out how to manipulate FSR and FAR
+     * when both MMU_NF and probe are set.  In the meantime,
+     * do not support this use case.
+     */
+    assert(!probe);
+
     address &= TARGET_PAGE_MASK;
     error_code = get_physical_address(env, &paddr, &prot, &access_index,
-                                      address, rw, mmu_idx, &page_size);
+                                      address, access_type,
+                                      mmu_idx, &page_size);
     vaddr = address;
-    if (error_code == 0) {
+    if (likely(error_code == 0)) {
         qemu_log_mask(CPU_LOG_MMU,
-                "Translate at %" VADDR_PRIx " -> " TARGET_FMT_plx ", vaddr "
-                TARGET_FMT_lx "\n", address, paddr, vaddr);
+                      "Translate at %" VADDR_PRIx " -> "
+                      TARGET_FMT_plx ", vaddr " TARGET_FMT_lx "\n",
+                      address, paddr, vaddr);
         tlb_set_page(cs, vaddr, paddr, prot, mmu_idx, page_size);
-        return 0;
+        return true;
     }
 
     if (env->mmuregs[3]) { /* Fault status register */
@@ -243,14 +255,14 @@ int sparc_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
            switching to normal mode. */
         prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
         tlb_set_page(cs, vaddr, paddr, prot, mmu_idx, TARGET_PAGE_SIZE);
-        return 0;
+        return true;
     } else {
-        if (rw & 2) {
+        if (access_type == MMU_INST_FETCH) {
             cs->exception_index = TT_TFAULT;
         } else {
             cs->exception_index = TT_DFAULT;
         }
-        return 1;
+        cpu_loop_exit_restore(cs, retaddr);
     }
 }
 
@@ -713,8 +725,9 @@ static int get_physical_address(CPUSPARCState *env, hwaddr *physical,
 }
 
 /* Perform address translation */
-int sparc_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
-                               int mmu_idx)
+bool sparc_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
+                        MMUAccessType access_type, int mmu_idx,
+                        bool probe, uintptr_t retaddr)
 {
     SPARCCPU *cpu = SPARC_CPU(cs);
     CPUSPARCState *env = &cpu->env;
@@ -725,8 +738,9 @@ int sparc_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
 
     address &= TARGET_PAGE_MASK;
     error_code = get_physical_address(env, &paddr, &prot, &access_index,
-                                      address, rw, mmu_idx, &page_size);
-    if (error_code == 0) {
+                                      address, access_type,
+                                      mmu_idx, &page_size);
+    if (likely(error_code == 0)) {
         vaddr = address;
 
         trace_mmu_helper_mmu_fault(address, paddr, mmu_idx, env->tl,
@@ -734,10 +748,12 @@ int sparc_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
                                    env->dmmu.mmu_secondary_context);
 
         tlb_set_page(cs, vaddr, paddr, prot, mmu_idx, page_size);
-        return 0;
+        return true;
     }
-    /* XXX */
-    return 1;
+    if (probe) {
+        return false;
+    }
+    cpu_loop_exit_restore(cs, retaddr);
 }
 
 void dump_mmu(CPUSPARCState *env)
-- 
2.17.1