[Qemu-devel] [PATCH] SPARC: Fix Leon3 cache control

[Fabien Chouteau]

The "leon3_cache_control_int" (op_helper.c) function is called within leon3.c
which leads to segfault error with the global "env".

Now cache control is a CPU feature and everything is handled in op_helper.c.

Signed-off-by: Fabien Chouteau <address@hidden>
---
 hw/leon3.c               |    1 -
 target-sparc/cpu.h       |    4 ++--
 target-sparc/helper.c    |    2 +-
 target-sparc/op_helper.c |   23 +++++++++++++++++------
 4 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/hw/leon3.c b/hw/leon3.c
index 69d8f3b..aaf26fd 100644
--- a/hw/leon3.c
+++ b/hw/leon3.c
@@ -59,7 +59,6 @@ static void main_cpu_reset(void *opaque)
 static void leon3_irq_ack(void *irq_manager, int intno)
 {
     grlib_irqmp_ack((DeviceState *)irq_manager, intno);
-    leon3_cache_control_int();
 }
 
 static void leon3_set_pil_in(void *opaque, uint32_t pil_in)
diff --git a/target-sparc/cpu.h b/target-sparc/cpu.h
index 6f5990b..8141b32 100644
--- a/target-sparc/cpu.h
+++ b/target-sparc/cpu.h
@@ -268,6 +268,8 @@ typedef struct sparc_def_t {
 #define CPU_FEATURE_GL           (1 << 13)
 #define CPU_FEATURE_TA0_SHUTDOWN (1 << 14) /* Shutdown on "ta 0x0" */
 #define CPU_FEATURE_ASR17        (1 << 15)
+#define CPU_FEATURE_CACHE_CTRL   (1 << 16)
+
 #ifndef TARGET_SPARC64
 #define CPU_DEFAULT_FEATURES (CPU_FEATURE_FLOAT | CPU_FEATURE_SWAP |  \
                               CPU_FEATURE_MUL | CPU_FEATURE_DIV |     \
@@ -477,8 +479,6 @@ int cpu_cwp_inc(CPUState *env1, int cwp);
 int cpu_cwp_dec(CPUState *env1, int cwp);
 void cpu_set_cwp(CPUState *env1, int new_cwp);
 
-void leon3_cache_control_int(void);
-
 /* sun4m.c, sun4u.c */
 void cpu_check_irqs(CPUSPARCState *env);
 
diff --git a/target-sparc/helper.c b/target-sparc/helper.c
index 2f3d1e6..b2d4d70 100644
--- a/target-sparc/helper.c
+++ b/target-sparc/helper.c
@@ -1289,7 +1289,7 @@ static const sparc_def_t sparc_defs[] = {
         .mmu_trcr_mask = 0xffffffff,
         .nwindows = 8,
         .features = CPU_DEFAULT_FEATURES | CPU_FEATURE_TA0_SHUTDOWN |
-        CPU_FEATURE_ASR17,
+        CPU_FEATURE_ASR17 | CPU_FEATURE_CACHE_CTRL,
     },
 #endif
 };
diff --git a/target-sparc/op_helper.c b/target-sparc/op_helper.c
index d3e1b63..698c159 100644
--- a/target-sparc/op_helper.c
+++ b/target-sparc/op_helper.c
@@ -1653,7 +1653,7 @@ static void dump_asi(const char *txt, target_ulong addr, 
int asi, int size,
 
 /* Leon3 cache control */
 
-void leon3_cache_control_int(void)
+static void leon3_cache_control_int(void)
 {
     uint32_t state = 0;
 
@@ -1741,7 +1741,7 @@ static uint64_t leon3_cache_control_ld(target_ulong addr, 
int size)
         DPRINTF_CACHE_CONTROL("read unknown register %08x\n", addr);
         break;
     };
-    DPRINTF_CACHE_CONTROL("st addr:%08x, ret:%" PRIx64 ", size:%d\n",
+    DPRINTF_CACHE_CONTROL("ld addr:%08x, ret:0x%" PRIx64 ", size:%d\n",
                           addr, ret, size);
     return ret;
 }
@@ -1760,7 +1760,9 @@ uint64_t helper_ld_asi(target_ulong addr, int asi, int 
size, int sign)
         case 0x00:          /* Leon3 Cache Control */
         case 0x08:          /* Leon3 Instruction Cache config */
         case 0x0C:          /* Leon3 Date Cache config */
-            ret = leon3_cache_control_ld(addr, size);
+            if (env->def->features & CPU_FEATURE_CACHE_CTRL) {
+                ret = leon3_cache_control_ld(addr, size);
+            }
             break;
         case 0x01c00a00: /* MXCC control register */
             if (size == 8)
@@ -1994,7 +1996,9 @@ void helper_st_asi(target_ulong addr, uint64_t val, int 
asi, int size)
         case 0x00:          /* Leon3 Cache Control */
         case 0x08:          /* Leon3 Instruction Cache config */
         case 0x0C:          /* Leon3 Date Cache config */
-            leon3_cache_control_st(addr, val, size);
+            if (env->def->features & CPU_FEATURE_CACHE_CTRL) {
+                leon3_cache_control_st(addr, val, size);
+            }
             break;
 
         case 0x01c00000: /* MXCC stream data register 0 */
@@ -4325,9 +4329,16 @@ void do_interrupt(CPUState *env)
 
 #if !defined(CONFIG_USER_ONLY)
     /* IRQ acknowledgment */
-    if ((intno & ~15) == TT_EXTINT && env->qemu_irq_ack != NULL) {
-        env->qemu_irq_ack(env->irq_manager, intno);
+    if ((intno & ~15) == TT_EXTINT) {
+        if (env->qemu_irq_ack != NULL) {
+            env->qemu_irq_ack(env->irq_manager, intno);
+        }
+
+        if (env->def->features & CPU_FEATURE_CACHE_CTRL) {
+            leon3_cache_control_int();
+        }
     }
+
 #endif
 }
 #endif
-- 
1.7.1