cpu: Add CPUArchState pointer to CPUState

The target-specific ENV_GET_CPU() macros have allowed us to navigate
from CPUArchState to CPUState. The reverse direction was not supported.
Avoid introducing CPU_GET_ENV() macros by initializing an untyped
pointer that is initialized in derived instance_init functions.

The field may not be called "env" due to it being poisoned.

Acked-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andreas Färber <afaerber@suse.de>

include/qom/cpu.h

@@ -71,6 +71,7 @@ struct kvm_run;
  * @created: Indicates whether the CPU thread has been successfully created.
  * @stop: Indicates a pending stop request.
  * @stopped: Indicates the CPU has been artificially stopped.
+ * @env_ptr: Pointer to subclass-specific CPUArchState field.
  * @current_tb: Currently executing TB.
  * @kvm_fd: vCPU file descriptor for KVM.
  *
@@ -100,6 +101,7 @@ struct CPUState {
     bool stopped;
     volatile sig_atomic_t exit_request;
 
+    void *env_ptr; /* CPUArchState */
     struct TranslationBlock *current_tb;
 
     int kvm_fd;

target-alpha/cpu.c

@@ -233,9 +233,11 @@ static const TypeInfo ev68_cpu_type_info = {
 
 static void alpha_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     AlphaCPU *cpu = ALPHA_CPU(obj);
     CPUAlphaState *env = &cpu->env;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
     tlb_flush(env, 1);
 

target-arm/cpu.c

@@ -134,9 +134,11 @@ static inline void set_feature(CPUARMState *env, int feature)
 
 static void arm_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     ARMCPU *cpu = ARM_CPU(obj);
     static bool inited;
 
+    cs->env_ptr = &cpu->env;
     cpu_exec_init(&cpu->env);
     cpu->cp_regs = g_hash_table_new_full(g_int_hash, g_int_equal,
                                          g_free, g_free);

target-cris/cpu.c

@@ -146,11 +146,13 @@ static void cris_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void cris_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     CRISCPU *cpu = CRIS_CPU(obj);
     CRISCPUClass *ccc = CRIS_CPU_GET_CLASS(obj);
     CPUCRISState *env = &cpu->env;
     static bool tcg_initialized;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     env->pregs[PR_VR] = ccc->vr;

target-i386/cpu.c

@@ -2164,6 +2164,7 @@ static void x86_cpu_initfn(Object *obj)
     CPUX86State *env = &cpu->env;
     static int inited;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     object_property_add(obj, "family", "int",

target-lm32/cpu.c

@@ -56,10 +56,12 @@ static void lm32_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void lm32_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     LM32CPU *cpu = LM32_CPU(obj);
     CPULM32State *env = &cpu->env;
     static bool tcg_initialized;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     env->flags = 0;

target-m68k/cpu.c

@@ -154,10 +154,12 @@ static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void m68k_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     M68kCPU *cpu = M68K_CPU(obj);
     CPUM68KState *env = &cpu->env;
     static bool inited;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     if (tcg_enabled() && !inited) {

target-microblaze/cpu.c

@@ -98,10 +98,12 @@ static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void mb_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     MicroBlazeCPU *cpu = MICROBLAZE_CPU(obj);
     CPUMBState *env = &cpu->env;
     static bool tcg_initialized;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     set_float_rounding_mode(float_round_nearest_even, &env->fp_status);

target-mips/cpu.c

@@ -55,9 +55,11 @@ static void mips_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void mips_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     MIPSCPU *cpu = MIPS_CPU(obj);
     CPUMIPSState *env = &cpu->env;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     if (tcg_enabled()) {

target-openrisc/cpu.c

@@ -75,9 +75,11 @@ static void openrisc_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void openrisc_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     OpenRISCCPU *cpu = OPENRISC_CPU(obj);
     static int inited;
 
+    cs->env_ptr = &cpu->env;
     cpu_exec_init(&cpu->env);
 
 #ifndef CONFIG_USER_ONLY

target-ppc/translate_init.c

@@ -10529,11 +10529,13 @@ static void ppc_cpu_reset(CPUState *s)
 
 static void ppc_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     PowerPCCPU *cpu = POWERPC_CPU(obj);
     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
     CPUPPCState *env = &cpu->env;
     ppc_def_t *def = pcc->info;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     env->msr_mask = def->msr_mask;

target-s390x/cpu.c

@@ -110,6 +110,7 @@ static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void s390_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     S390CPU *cpu = S390_CPU(obj);
     CPUS390XState *env = &cpu->env;
     static bool inited;
@@ -118,6 +119,7 @@ static void s390_cpu_initfn(Object *obj)
     struct tm tm;
 #endif
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 #if !defined(CONFIG_USER_ONLY)
     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);

target-sh4/cpu.c

@@ -67,9 +67,11 @@ static void superh_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void superh_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     SuperHCPU *cpu = SUPERH_CPU(obj);
     CPUSH4State *env = &cpu->env;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     env->movcal_backup_tail = &(env->movcal_backup);

target-sparc/cpu.c

@@ -860,9 +860,11 @@ static void sparc_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void sparc_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     SPARCCPU *cpu = SPARC_CPU(obj);
     CPUSPARCState *env = &cpu->env;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     if (tcg_enabled()) {

target-unicore32/cpu.c

@@ -93,10 +93,12 @@ static void uc32_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void uc32_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     UniCore32CPU *cpu = UNICORE32_CPU(obj);
     CPUUniCore32State *env = &cpu->env;
     static bool inited;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
 #ifdef CONFIG_USER_ONLY

target-xtensa/cpu.c

@@ -69,10 +69,12 @@ static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp)
 
 static void xtensa_cpu_initfn(Object *obj)
 {
+    CPUState *cs = CPU(obj);
     XtensaCPU *cpu = XTENSA_CPU(obj);
     CPUXtensaState *env = &cpu->env;
     static bool tcg_inited;
 
+    cs->env_ptr = env;
     cpu_exec_init(env);
 
     if (tcg_enabled() && !tcg_inited) {