{linux,bsd}-user: Introduce get_task_state()

A CPU's TaskState is stored in the CPUState's void *opaque field,
accessing which is somewhat awkward due to having to use a cast.
Introduce a wrapper and use it everywhere.

Suggested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240219141628.246823-3-iii@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240305121005.3528075-4-alex.bennee@linaro.org>

bsd-user/bsd-file.h

@@ -641,7 +641,7 @@ static abi_long do_bsd_readlink(CPUArchState *env, abi_long arg1,
     }
     if (strcmp(p1, "/proc/curproc/file") == 0) {
         CPUState *cpu = env_cpu(env);
-        TaskState *ts = (TaskState *)cpu->opaque;
+        TaskState *ts = get_task_state(cpu);
         strncpy(p2, ts->bprm->fullpath, arg3);
         ret = MIN((abi_long)strlen(ts->bprm->fullpath), arg3);
     } else {

bsd-user/qemu.h

@@ -117,6 +117,11 @@ typedef struct TaskState {
     struct target_sigaltstack sigaltstack_used;
 } __attribute__((aligned(16))) TaskState;
 
+static inline TaskState *get_task_state(CPUState *cs)
+{
+    return cs->opaque;
+}
+
 void stop_all_tasks(void);
 extern const char *interp_prefix;
 extern const char *qemu_uname_release;

bsd-user/signal.c

@@ -319,7 +319,7 @@ void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
 
 int block_signals(void)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
     sigset_t set;
 
     /*
@@ -359,7 +359,7 @@ void dump_core_and_abort(int target_sig)
 {
     CPUState *cpu = thread_cpu;
     CPUArchState *env = cpu_env(cpu);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     int core_dumped = 0;
     int host_sig;
     struct sigaction act;
@@ -421,7 +421,7 @@ void queue_signal(CPUArchState *env, int sig, int si_type,
                   target_siginfo_t *info)
 {
     CPUState *cpu = env_cpu(env);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
 
     trace_user_queue_signal(env, sig);
 
@@ -476,7 +476,7 @@ void force_sig_fault(int sig, int code, abi_ulong addr)
 static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
 {
     CPUState *cpu = thread_cpu;
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     target_siginfo_t tinfo;
     ucontext_t *uc = puc;
     struct emulated_sigtable *k;
@@ -585,7 +585,7 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
 /* compare to kern/kern_sig.c sys_sigaltstack() and kern_sigaltstack() */
 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
     int ret;
     target_stack_t oss;
 
@@ -714,7 +714,7 @@ int do_sigaction(int sig, const struct target_sigaction *act,
 static inline abi_ulong get_sigframe(struct target_sigaction *ka,
         CPUArchState *env, size_t frame_size)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
     abi_ulong sp;
 
     /* Use default user stack */
@@ -789,7 +789,7 @@ static int reset_signal_mask(target_ucontext_t *ucontext)
     int i;
     sigset_t blocked;
     target_sigset_t target_set;
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
 
     for (i = 0; i < TARGET_NSIG_WORDS; i++) {
         __get_user(target_set.__bits[i], &ucontext->uc_sigmask.__bits[i]);
@@ -839,7 +839,7 @@ badframe:
 
 void signal_init(void)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
     struct sigaction act;
     struct sigaction oact;
     int i;
@@ -878,7 +878,7 @@ static void handle_pending_signal(CPUArchState *env, int sig,
                                   struct emulated_sigtable *k)
 {
     CPUState *cpu = env_cpu(env);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     struct target_sigaction *sa;
     int code;
     sigset_t set;
@@ -967,7 +967,7 @@ void process_pending_signals(CPUArchState *env)
     int sig;
     sigset_t *blocked_set, set;
     struct emulated_sigtable *k;
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
 
     while (qatomic_read(&ts->signal_pending)) {
         sigfillset(&set);

gdbstub/user-target.c

@@ -204,7 +204,7 @@ int gdb_target_signal_to_gdb(int sig)
 
 int gdb_get_cpu_index(CPUState *cpu)
 {
-    TaskState *ts = (TaskState *) cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     return ts ? ts->ts_tid : -1;
 }
 
@@ -399,7 +399,7 @@ void gdb_handle_query_xfer_exec_file(GArray *params, void *user_ctx)
         return;
     }
 
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     if (!ts || !ts->bprm || !ts->bprm->filename) {
         gdb_put_packet("E00");
         return;

include/user/safe-syscall.h

@@ -134,7 +134,7 @@ extern char safe_syscall_start[];
 extern char safe_syscall_end[];
 
 #define safe_syscall(...)                                                 \
-    safe_syscall_base(&((TaskState *)thread_cpu->opaque)->signal_pending, \
+    safe_syscall_base(&get_task_state(thread_cpu)->signal_pending,        \
                       __VA_ARGS__)
 
 #endif

linux-user/aarch64/cpu_loop.c

@@ -189,7 +189,7 @@ void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 {
     ARMCPU *cpu = env_archcpu(env);
     CPUState *cs = env_cpu(env);
-    TaskState *ts = cs->opaque;
+    TaskState *ts = get_task_state(cs);
     struct image_info *info = ts->info;
     int i;
 

linux-user/arm/cpu_loop.c

@@ -263,7 +263,7 @@ static bool insn_is_linux_bkpt(uint32_t opcode, bool is_thumb)
 
 static bool emulate_arm_fpa11(CPUARMState *env, uint32_t opcode)
 {
-    TaskState *ts = env_cpu(env)->opaque;
+    TaskState *ts = get_task_state(env_cpu(env));
     int rc = EmulateAll(opcode, &ts->fpa, env);
     int raise, enabled;
 
@@ -514,7 +514,7 @@ void cpu_loop(CPUARMState *env)
 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 {
     CPUState *cpu = env_cpu(env);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     struct image_info *info = ts->info;
     int i;
 

linux-user/arm/signal.c

@@ -177,7 +177,7 @@ setup_return(CPUARMState *env, struct target_sigaction *ka, int usig,
     abi_ulong handler = 0;
     abi_ulong handler_fdpic_GOT = 0;
     abi_ulong retcode;
-    bool is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info);
+    bool is_fdpic = info_is_fdpic(get_task_state(thread_cpu)->info);
     bool is_rt = ka->sa_flags & TARGET_SA_SIGINFO;
     bool thumb;
 

linux-user/cris/cpu_loop.c

@@ -72,7 +72,7 @@ void cpu_loop(CPUCRISState *env)
 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 {
     CPUState *cpu = env_cpu(env);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     struct image_info *info = ts->info;
 
     env->regs[0] = regs->r0;

linux-user/elfload.c

@@ -4404,7 +4404,7 @@ static int wmr_write_region(void *opaque, target_ulong start,
 static int elf_core_dump(int signr, const CPUArchState *env)
 {
     const CPUState *cpu = env_cpu((CPUArchState *)env);
-    const TaskState *ts = (const TaskState *)cpu->opaque;
+    const TaskState *ts = (const TaskState *)get_task_state((CPUState *)cpu);
     struct rlimit dumpsize;
     CountAndSizeRegions css;
     off_t offset, note_offset, data_offset;

linux-user/hppa/signal.c

@@ -112,7 +112,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
     abi_ulong frame_addr, sp, haddr;
     struct target_rt_sigframe *frame;
     int i;
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
 
     sp = get_sp_from_cpustate(env);
     if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) {

linux-user/linuxload.c

@@ -89,7 +89,7 @@ static int prepare_binprm(struct linux_binprm *bprm)
 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
                               abi_ulong stringp, int push_ptr)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
     int n = sizeof(abi_ulong);
     abi_ulong envp;
     abi_ulong argv;

linux-user/m68k/cpu_loop.c

@@ -95,7 +95,7 @@ void cpu_loop(CPUM68KState *env)
 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 {
     CPUState *cpu = env_cpu(env);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     struct image_info *info = ts->info;
 
     env->pc = regs->pc;

linux-user/m68k/target_cpu.h

@@ -37,7 +37,7 @@ static inline void cpu_clone_regs_parent(CPUM68KState *env, unsigned flags)
 static inline void cpu_set_tls(CPUM68KState *env, target_ulong newtls)
 {
     CPUState *cs = env_cpu(env);
-    TaskState *ts = cs->opaque;
+    TaskState *ts = get_task_state(cs);
 
     ts->tp_value = newtls;
 }

linux-user/mips/cpu_loop.c

@@ -214,7 +214,7 @@ done_syscall:
 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 {
     CPUState *cpu = env_cpu(env);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     struct image_info *info = ts->info;
     int i;
 

linux-user/ppc/signal.c

@@ -486,7 +486,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
     int i, err = 0;
 #if defined(TARGET_PPC64)
     struct target_sigcontext *sc = 0;
-    struct image_info *image = ((TaskState *)thread_cpu->opaque)->info;
+    struct image_info *image = get_task_state(thread_cpu)->info;
 #endif
 
     rt_sf_addr = get_sigframe(ka, env, sizeof(*rt_sf));
@@ -673,7 +673,7 @@ abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx,
     }
 
     if (uold_ctx) {
-        TaskState *ts = (TaskState *)thread_cpu->opaque;
+        TaskState *ts = get_task_state(thread_cpu);
 
         if (!lock_user_struct(VERIFY_WRITE, uctx, uold_ctx, 1)) {
             return -TARGET_EFAULT;

linux-user/qemu.h

@@ -162,6 +162,11 @@ typedef struct TaskState {
     uint64_t start_boottime;
 } TaskState;
 
+static inline TaskState *get_task_state(CPUState *cs)
+{
+    return cs->opaque;
+}
+
 abi_long do_brk(abi_ulong new_brk);
 int do_guest_openat(CPUArchState *cpu_env, int dirfd, const char *pathname,
                     int flags, mode_t mode, bool safe);

linux-user/riscv/cpu_loop.c

@@ -97,7 +97,7 @@ void cpu_loop(CPURISCVState *env)
 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 {
     CPUState *cpu = env_cpu(env);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     struct image_info *info = ts->info;
 
     env->pc = regs->sepc;

linux-user/signal-common.h

@@ -113,7 +113,7 @@ int process_sigsuspend_mask(sigset_t **pset, target_ulong sigset,
 static inline void finish_sigsuspend_mask(int ret)
 {
     if (ret != -QEMU_ERESTARTSYS) {
-        TaskState *ts = (TaskState *)thread_cpu->opaque;
+        TaskState *ts = get_task_state(thread_cpu);
         ts->in_sigsuspend = 1;
     }
 }

linux-user/signal.c

@@ -172,7 +172,7 @@ void target_to_host_old_sigset(sigset_t *sigset,
 
 int block_signals(void)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
     sigset_t set;
 
     /* It's OK to block everything including SIGSEGV, because we won't
@@ -194,7 +194,7 @@ int block_signals(void)
  */
 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
 
     if (oldset) {
         *oldset = ts->signal_mask;
@@ -237,7 +237,7 @@ int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset)
  */
 void set_sigmask(const sigset_t *set)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
 
     ts->signal_mask = *set;
 }
@@ -246,7 +246,7 @@ void set_sigmask(const sigset_t *set)
 
 int on_sig_stack(unsigned long sp)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
 
     return (sp - ts->sigaltstack_used.ss_sp
             < ts->sigaltstack_used.ss_size);
@@ -254,7 +254,7 @@ int on_sig_stack(unsigned long sp)
 
 int sas_ss_flags(unsigned long sp)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
 
     return (ts->sigaltstack_used.ss_size == 0 ? SS_DISABLE
             : on_sig_stack(sp) ? SS_ONSTACK : 0);
@@ -265,7 +265,7 @@ abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka)
     /*
      * This is the X/Open sanctioned signal stack switching.
      */
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
 
     if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) {
         return ts->sigaltstack_used.ss_sp + ts->sigaltstack_used.ss_size;
@@ -275,7 +275,7 @@ abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka)
 
 void target_save_altstack(target_stack_t *uss, CPUArchState *env)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
 
     __put_user(ts->sigaltstack_used.ss_sp, &uss->ss_sp);
     __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &uss->ss_flags);
@@ -284,7 +284,7 @@ void target_save_altstack(target_stack_t *uss, CPUArchState *env)
 
 abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
     size_t minstacksize = TARGET_MINSIGSTKSZ;
     target_stack_t ss;
 
@@ -571,7 +571,7 @@ static void signal_table_init(void)
 
 void signal_init(void)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
     struct sigaction act, oact;
 
     /* initialize signal conversion tables */
@@ -730,7 +730,7 @@ static G_NORETURN
 void dump_core_and_abort(CPUArchState *env, int target_sig)
 {
     CPUState *cpu = env_cpu(env);
-    TaskState *ts = (TaskState *)cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     int host_sig, core_dumped = 0;
 
     /* On exit, undo the remapping of SIGABRT. */
@@ -769,7 +769,7 @@ void queue_signal(CPUArchState *env, int sig, int si_type,
                   target_siginfo_t *info)
 {
     CPUState *cpu = env_cpu(env);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
 
     trace_user_queue_signal(env, sig);
 
@@ -954,7 +954,7 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
 {
     CPUState *cpu = thread_cpu;
     CPUArchState *env = cpu_env(cpu);
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     target_siginfo_t tinfo;
     host_sigcontext *uc = puc;
     struct emulated_sigtable *k;
@@ -1174,7 +1174,7 @@ static void handle_pending_signal(CPUArchState *cpu_env, int sig,
     sigset_t set;
     target_sigset_t target_old_set;
     struct target_sigaction *sa;
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
 
     trace_user_handle_signal(cpu_env, sig);
     /* dequeue signal */
@@ -1256,7 +1256,7 @@ void process_pending_signals(CPUArchState *cpu_env)
 {
     CPUState *cpu = env_cpu(cpu_env);
     int sig;
-    TaskState *ts = cpu->opaque;
+    TaskState *ts = get_task_state(cpu);
     sigset_t set;
     sigset_t *blocked_set;
 
@@ -1316,7 +1316,7 @@ void process_pending_signals(CPUArchState *cpu_env)
 int process_sigsuspend_mask(sigset_t **pset, target_ulong sigset,
                             target_ulong sigsize)
 {
-    TaskState *ts = (TaskState *)thread_cpu->opaque;
+    TaskState *ts = get_task_state(thread_cpu);
     sigset_t *host_set = &ts->sigsuspend_mask;
     target_sigset_t *target_sigset;