Move clone() register setup to target specific code. Handle fork-like clone.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4623 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/syscall.c

@@ -2744,64 +2744,8 @@ int do_fork(CPUState *env, unsigned int flags, abi_ulong newsp)
         first_task_state = ts;
         /* we create a new CPU instance. */
         new_env = cpu_copy(env);
-#if defined(TARGET_I386)
-        if (!newsp)
-            newsp = env->regs[R_ESP];
-        new_env->regs[R_ESP] = newsp;
-        new_env->regs[R_EAX] = 0;
-#elif defined(TARGET_ARM)
-        if (!newsp)
-            newsp = env->regs[13];
-        new_env->regs[13] = newsp;
-        new_env->regs[0] = 0;
-#elif defined(TARGET_SPARC)
-        if (!newsp)
-            newsp = env->regwptr[22];
-        new_env->regwptr[22] = newsp;
-        new_env->regwptr[0] = 0;
-	/* XXXXX */
-        printf ("HELPME: %s:%d\n", __FILE__, __LINE__);
-#elif defined(TARGET_M68K)
-        if (!newsp)
-            newsp = env->aregs[7];
-        new_env->aregs[7] = newsp;
-        new_env->dregs[0] = 0;
-        /* ??? is this sufficient?  */
-#elif defined(TARGET_MIPS)
-        if (!newsp)
-            newsp = env->gpr[env->current_tc][29];
-        new_env->gpr[env->current_tc][29] = newsp;
-#elif defined(TARGET_PPC)
-        if (!newsp)
-            newsp = env->gpr[1];
-        new_env->gpr[1] = newsp;
-        {
-            int i;
-            for (i = 7; i < 32; i++)
-                new_env->gpr[i] = 0;
-        }
-#elif defined(TARGET_SH4)
-	if (!newsp)
-	  newsp = env->gregs[15];
-	new_env->gregs[15] = newsp;
-	/* XXXXX */
-#elif defined(TARGET_ALPHA)
-       if (!newsp)
-         newsp = env->ir[30];
-       new_env->ir[30] = newsp;
-        /* ? */
-        {
-            int i;
-            for (i = 7; i < 30; i++)
-                new_env->ir[i] = 0;
-        }
-#elif defined(TARGET_CRIS)
-	if (!newsp)
-	  newsp = env->regs[14];
-	new_env->regs[14] = newsp;
-#else
-#error unsupported target CPU
-#endif
+        /* Init regs that differ from the parent.  */
+        cpu_clone_regs(new_env, newsp);
         new_env->opaque = ts;
 #ifdef __ia64__
         ret = __clone2(clone_func, new_stack + NEW_STACK_SIZE, flags, new_env);
@@ -2813,6 +2757,9 @@ int do_fork(CPUState *env, unsigned int flags, abi_ulong newsp)
         if ((flags & ~CSIGNAL) != 0)
             return -EINVAL;
         ret = fork();
+        if (ret == 0) {
+            cpu_clone_regs(env, newsp);
+        }
     }
     return ret;
 }

target-alpha/cpu.h

@@ -311,6 +311,15 @@ static inline int cpu_mmu_index (CPUState *env)
     return (env->ps >> 3) & 3;
 }
 
+#if defined(CONFIG_USER_ONLY)
+static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
+{
+    if (!newsp)
+        env->ir[30] = newsp;
+    /* FIXME: Zero syscall return value.  */
+}
+#endif
+
 #include "cpu-all.h"
 
 enum {

target-arm/cpu.h

@@ -408,6 +408,15 @@ static inline int cpu_mmu_index (CPUState *env)
     return (env->uncached_cpsr & CPSR_M) == ARM_CPU_MODE_USR ? 1 : 0;
 }
 
+#if defined(CONFIG_USER_ONLY)
+static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
+{
+    if (!newsp)
+        env->regs[13] = newsp;
+    env->regs[0] = 0;
+}
+#endif
+
 #include "cpu-all.h"
 
 #endif

target-cris/cpu.h

@@ -218,6 +218,15 @@ static inline int cpu_mmu_index (CPUState *env)
 	return !!(env->pregs[PR_CCS] & U_FLAG);
 }
 
+#if defined(CONFIG_USER_ONLY)
+static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
+{
+    if (!newsp)
+        env->regs[14] = newsp;
+    env->regs[10] = 0;
+}
+#endif
+
 /* Support function regs.  */
 #define SFR_RW_GC_CFG      0][0
 #define SFR_RW_MM_CFG      env->pregs[PR_SRS]][0

target-i386/cpu.h

@@ -734,6 +734,15 @@ typedef struct CCTable {
 
 extern CCTable cc_table[];
 
+#if defined(CONFIG_USER_ONLY)
+static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
+{
+    if (!newsp)
+        env->regs[R_ESP] = newsp;
+    env->regs[R_EAX] = 0;
+}
+#endif
+
 #include "cpu-all.h"
 
 #include "svm.h"

target-m68k/cpu.h

@@ -226,6 +226,15 @@ static inline int cpu_mmu_index (CPUState *env)
     return (env->sr & SR_S) == 0 ? 1 : 0;
 }
 
+#if defined(CONFIG_USER_ONLY)
+static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
+{
+    if (!newsp)
+        env->aregs[7] = newsp;
+    env->dregs[0] = 0;
+}
+#endif
+
 #include "cpu-all.h"
 
 #endif

target-mips/cpu.h

@@ -500,6 +500,16 @@ static inline int cpu_mmu_index (CPUState *env)
     return env->hflags & MIPS_HFLAG_KSU;
 }
 
+#if defined(CONFIG_USER_ONLY)
+static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
+{
+    if (!newsp)
+        env->gpr[env->current_tc][29] = newsp;
+    env->gpr[env->current_tc][7] = 0;
+    env->gpr[env->current_tc][2] = 0;
+}
+#endif
+
 #include "cpu-all.h"
 
 /* Memory access type :

target-ppc/cpu.h

@@ -822,6 +822,17 @@ static inline int cpu_mmu_index (CPUState *env)
     return env->mmu_idx;
 }
 
+#if defined(CONFIG_USER_ONLY)
+static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
+{
+    int i;
+    if (!newsp)
+        env->gpr[1] = newsp;
+    for (i = 7; i < 32; i++)
+        env->gpr[i] = 0;
+}
+#endif
+
 #include "cpu-all.h"
 
 /*****************************************************************************/

target-sh4/cpu.h

@@ -143,6 +143,15 @@ static inline int cpu_mmu_index (CPUState *env)
     return (env->sr & SR_MD) == 0 ? 1 : 0;
 }
 
+#if defined(CONFIG_USER_ONLY)
+static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
+{
+    if (!newsp)
+        env->gregs[15] = newsp;
+    env->gregs[0] = 0;
+}
+#endif
+
 #include "cpu-all.h"
 
 /* Memory access type */

target-sparc/cpu.h

@@ -403,6 +403,18 @@ static inline int cpu_fpu_enabled(CPUState *env1)
 #endif
 }
 
+#if defined(CONFIG_USER_ONLY)
+static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
+{
+    if (!newsp)
+        env->regwptr[22] = newsp;
+    env->regwptr[0] = 0;
+    /* FIXME: Do we also need to clear CF?  */
+    /* XXXXX */
+    printf ("HELPME: %s:%d\n", __FILE__, __LINE__);
+}
+#endif
+
 #include "cpu-all.h"
 
 #endif