SH4: Signal handling for the user space emulator, by Magnus Damm.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3764 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/main.c

@@ -1617,6 +1617,9 @@ void cpu_loop (CPUState *env)
             env->gregs[0] = ret;
             env->pc += 2;
             break;
+        case EXCP_INTERRUPT:
+            /* just indicate that signals should be handled asap */
+            break;
         case EXCP_DEBUG:
             {
                 int sig;
@@ -1631,6 +1634,15 @@ void cpu_loop (CPUState *env)
                   }
             }
             break;
+	case 0xa0:
+	case 0xc0:
+            info.si_signo = SIGSEGV;
+            info.si_errno = 0;
+            info.si_code = TARGET_SEGV_MAPERR;
+            info._sifields._sigfault._addr = env->tea;
+            queue_signal(info.si_signo, &info);
+	    break;
+
         default:
             printf ("Unhandled trap: 0x%x\n", trapnr);
             cpu_dump_state(env, stderr, fprintf, 0);

linux-user/sh4/target_signal.h

@@ -21,4 +21,9 @@ typedef struct target_sigaltstack {
 #define TARGET_MINSIGSTKSZ    2048
 #define TARGET_SIGSTKSZ       8192
 
+static inline abi_ulong get_sp_from_cpustate(CPUSH4State *state)
+{
+    return state->gregs[15];
+}
+
 #endif /* TARGET_SIGNAL_H */

linux-user/signal.c

@@ -562,6 +562,12 @@ static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
     return 0;
 }
 
+static inline int current_exec_domain_sig(int sig)
+{
+    return /* current->exec_domain && current->exec_domain->signal_invmap
+	      && sig < 32 ? current->exec_domain->signal_invmap[sig] : */ sig;
+}
+
 #if defined(TARGET_I386) && TARGET_ABI_BITS == 32
 
 /* from the Linux kernel */
@@ -745,11 +751,7 @@ static void setup_frame(int sig, struct emulated_sigaction *ka,
 	if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
 		goto give_sigsegv;
 
-	err |= __put_user((/*current->exec_domain
-		           && current->exec_domain->signal_invmap
-		           && sig < 32
-		           ? current->exec_domain->signal_invmap[sig]
-		           : */ sig),
+	err |= __put_user(current_exec_domain_sig(sig),
 		          &frame->sig);
 	if (err)
 		goto give_sigsegv;
@@ -819,11 +821,7 @@ static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
 	if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
 		goto give_sigsegv;
 
-	err |= __put_user((/*current->exec_domain
-		    	   && current->exec_domain->signal_invmap
-		    	   && sig < 32
-		    	   ? current->exec_domain->signal_invmap[sig]
-			   : */sig),
+	err |= __put_user(current_exec_domain_sig(sig),
 			  &frame->sig);
         addr = frame_addr + offsetof(struct rt_sigframe, info);
 	err |= __put_user(addr, &frame->pinfo);
@@ -2406,6 +2404,309 @@ long do_rt_sigreturn(CPUState *env)
     return -TARGET_ENOSYS;
 }
 
+#elif defined(TARGET_SH4)
+
+/*
+ * code and data structures from linux kernel:
+ * include/asm-sh/sigcontext.h
+ * arch/sh/kernel/signal.c
+ */
+
+struct target_sigcontext {
+    target_ulong  oldmask;
+
+    /* CPU registers */
+    target_ulong  sc_gregs[16];
+    target_ulong  sc_pc;
+    target_ulong  sc_pr;
+    target_ulong  sc_sr;
+    target_ulong  sc_gbr;
+    target_ulong  sc_mach;
+    target_ulong  sc_macl;
+
+    /* FPU registers */
+    target_ulong  sc_fpregs[16];
+    target_ulong  sc_xfpregs[16];
+    unsigned int sc_fpscr;
+    unsigned int sc_fpul;
+    unsigned int sc_ownedfp;
+};
+
+struct target_sigframe
+{
+    struct target_sigcontext sc;
+    target_ulong extramask[TARGET_NSIG_WORDS-1];
+    uint16_t retcode[3];
+};
+
+
+struct target_ucontext {
+    target_ulong uc_flags;
+    struct target_ucontext *uc_link;
+    target_stack_t uc_stack;
+    struct target_sigcontext uc_mcontext;
+    target_sigset_t uc_sigmask;	/* mask last for extensibility */
+};
+
+struct target_rt_sigframe
+{
+    struct target_siginfo info;
+    struct target_ucontext uc;
+    uint16_t retcode[3];
+};
+
+
+#define MOVW(n)  (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */
+#define TRAP_NOARG 0xc310         /* Syscall w/no args (NR in R3) SH3/4 */
+
+static abi_ulong get_sigframe(struct emulated_sigaction *ka,
+                         unsigned long sp, size_t frame_size)
+{
+    if ((ka->sa.sa_flags & TARGET_SA_ONSTACK) && (sas_ss_flags(sp) == 0)) {
+        sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
+    }
+
+    return (sp - frame_size) & -8ul;
+}
+
+static int setup_sigcontext(struct target_sigcontext *sc,
+			    CPUState *regs, unsigned long mask)
+{
+    int err = 0;
+
+#define COPY(x)         err |= __put_user(regs->x, &sc->sc_##x)
+    COPY(gregs[0]); COPY(gregs[1]);
+    COPY(gregs[2]); COPY(gregs[3]);
+    COPY(gregs[4]); COPY(gregs[5]);
+    COPY(gregs[6]); COPY(gregs[7]);
+    COPY(gregs[8]); COPY(gregs[9]);
+    COPY(gregs[10]); COPY(gregs[11]);
+    COPY(gregs[12]); COPY(gregs[13]);
+    COPY(gregs[14]); COPY(gregs[15]);
+    COPY(gbr); COPY(mach);
+    COPY(macl); COPY(pr);
+    COPY(sr); COPY(pc);
+#undef COPY
+
+    /* todo: save FPU registers here */
+
+    /* non-iBCS2 extensions.. */
+    err |= __put_user(mask, &sc->oldmask);
+
+    return err;
+}
+
+static int restore_sigcontext(struct CPUState *regs,
+			      struct target_sigcontext *sc)
+{
+    unsigned int err = 0;
+
+#define COPY(x)         err |= __get_user(regs->x, &sc->sc_##x)
+    COPY(gregs[1]);
+    COPY(gregs[2]); COPY(gregs[3]);
+    COPY(gregs[4]); COPY(gregs[5]);
+    COPY(gregs[6]); COPY(gregs[7]);
+    COPY(gregs[8]); COPY(gregs[9]);
+    COPY(gregs[10]); COPY(gregs[11]);
+    COPY(gregs[12]); COPY(gregs[13]);
+    COPY(gregs[14]); COPY(gregs[15]);
+    COPY(gbr); COPY(mach);
+    COPY(macl); COPY(pr);
+    COPY(sr); COPY(pc);
+#undef COPY
+
+    /* todo: restore FPU registers here */
+
+    regs->tra = -1;         /* disable syscall checks */
+    return err;
+}
+
+static void setup_frame(int sig, struct emulated_sigaction *ka,
+			target_sigset_t *set, CPUState *regs)
+{
+    struct target_sigframe *frame;
+    abi_ulong frame_addr;
+    int i;
+    int err = 0;
+    int signal;
+
+    frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
+	goto give_sigsegv;
+
+    signal = current_exec_domain_sig(sig);
+
+    err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
+
+    for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
+        err |= __put_user(set->sig[i + 1], &frame->extramask[i]);
+    }
+
+    /* Set up to return from userspace.  If provided, use a stub
+       already in userspace.  */
+    if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
+        regs->pr = (unsigned long) ka->sa.sa_restorer;
+    } else {
+        /* Generate return code (system call to sigreturn) */
+        err |= __put_user(MOVW(2), &frame->retcode[0]);
+        err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
+        err |= __put_user((TARGET_NR_sigreturn), &frame->retcode[2]);
+        regs->pr = (unsigned long) frame->retcode;
+    }
+
+    if (err)
+        goto give_sigsegv;
+
+    /* Set up registers for signal handler */
+    regs->gregs[15] = (unsigned long) frame;
+    regs->gregs[4] = signal; /* Arg for signal handler */
+    regs->gregs[5] = 0;
+    regs->gregs[6] = (unsigned long) &frame->sc;
+    regs->pc = (unsigned long) ka->sa._sa_handler;
+
+    unlock_user_struct(frame, frame_addr, 1);
+    return;
+
+give_sigsegv:
+    unlock_user_struct(frame, frame_addr, 1);
+    force_sig(SIGSEGV);
+}
+
+static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
+                           target_siginfo_t *info,
+			   target_sigset_t *set, CPUState *regs)
+{
+    struct target_rt_sigframe *frame;
+    abi_ulong frame_addr;
+    int i;
+    int err = 0;
+    int signal;
+
+    frame_addr = get_sigframe(ka, regs->gregs[15], sizeof(*frame));
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
+	goto give_sigsegv;
+
+    signal = current_exec_domain_sig(sig);
+
+    err |= copy_siginfo_to_user(&frame->info, info);
+
+    /* Create the ucontext.  */
+    err |= __put_user(0, &frame->uc.uc_flags);
+    err |= __put_user(0, (unsigned long *)&frame->uc.uc_link);
+    err |= __put_user((void *)target_sigaltstack_used.ss_sp,
+		      &frame->uc.uc_stack.ss_sp);
+    err |= __put_user(sas_ss_flags(regs->gregs[15]),
+		      &frame->uc.uc_stack.ss_flags);
+    err |= __put_user(target_sigaltstack_used.ss_size,
+		      &frame->uc.uc_stack.ss_size);
+    err |= setup_sigcontext(&frame->uc.uc_mcontext,
+			    regs, set->sig[0]);
+    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
+        err |= __put_user(set->sig[i], &frame->uc.uc_sigmask.sig[i]);
+    }
+
+    /* Set up to return from userspace.  If provided, use a stub
+       already in userspace.  */
+    if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
+        regs->pr = (unsigned long) ka->sa.sa_restorer;
+    } else {
+        /* Generate return code (system call to sigreturn) */
+        err |= __put_user(MOVW(2), &frame->retcode[0]);
+        err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
+        err |= __put_user((TARGET_NR_rt_sigreturn), &frame->retcode[2]);
+        regs->pr = (unsigned long) frame->retcode;
+    }
+
+    if (err)
+        goto give_sigsegv;
+
+    /* Set up registers for signal handler */
+    regs->gregs[15] = (unsigned long) frame;
+    regs->gregs[4] = signal; /* Arg for signal handler */
+    regs->gregs[5] = (unsigned long) &frame->info;
+    regs->gregs[6] = (unsigned long) &frame->uc;
+    regs->pc = (unsigned long) ka->sa._sa_handler;
+
+    unlock_user_struct(frame, frame_addr, 1);
+    return;
+
+give_sigsegv:
+    unlock_user_struct(frame, frame_addr, 1);
+    force_sig(SIGSEGV);
+}
+
+long do_sigreturn(CPUState *regs)
+{
+    struct target_sigframe *frame;
+    abi_ulong frame_addr;
+    sigset_t blocked;
+    target_sigset_t target_set;
+    int i;
+    int err = 0;
+
+#if defined(DEBUG_SIGNAL)
+    fprintf(stderr, "do_sigreturn\n");
+#endif
+    frame_addr = regs->gregs[15];
+    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1))
+   	goto badframe;
+
+    err |= __get_user(target_set.sig[0], &frame->sc.oldmask);
+    for(i = 1; i < TARGET_NSIG_WORDS; i++) {
+        err |= (__get_user(target_set.sig[i], &frame->extramask[i - 1]));
+    }
+
+    if (err)
+        goto badframe;
+
+    target_to_host_sigset_internal(&blocked, &target_set);
+    sigprocmask(SIG_SETMASK, &blocked, NULL);
+
+    if (restore_sigcontext(regs, &frame->sc))
+        goto badframe;
+
+    unlock_user_struct(frame, frame_addr, 0);
+    return regs->gregs[0];
+
+badframe:
+    unlock_user_struct(frame, frame_addr, 0);
+    force_sig(TARGET_SIGSEGV);
+    return 0;
+}
+
+long do_rt_sigreturn(CPUState *regs)
+{
+    struct target_rt_sigframe *frame;
+    abi_ulong frame_addr;
+    sigset_t blocked;
+
+#if defined(DEBUG_SIGNAL)
+    fprintf(stderr, "do_rt_sigreturn\n");
+#endif
+    frame_addr = regs->gregs[15];
+    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1))
+   	goto badframe;
+
+    target_to_host_sigset(&blocked, &frame->uc.uc_sigmask);
+    sigprocmask(SIG_SETMASK, &blocked, NULL);
+
+    if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
+        goto badframe;
+
+    if (do_sigaltstack(frame_addr +
+		       offsetof(struct target_rt_sigframe, uc.uc_stack),
+		       0, get_sp_from_cpustate(regs)) == -EFAULT)
+        goto badframe;
+
+    unlock_user_struct(frame, frame_addr, 0);
+    return regs->gregs[0];
+
+badframe:
+    unlock_user_struct(frame, frame_addr, 0);
+    force_sig(TARGET_SIGSEGV);
+    return 0;
+}
+
 #else
 
 static void setup_frame(int sig, struct emulated_sigaction *ka,

target-sh4/helper.c

@@ -40,16 +40,16 @@ int cpu_sh4_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
 			     int mmu_idx, int is_softmmu)
 {
     env->tea = address;
+    env->exception_index = 0;
     switch (rw) {
     case 0:
+	env->tea = address;
         env->exception_index = 0x0a0;
         break;
     case 1:
+	env->tea = address;
         env->exception_index = 0x0c0;
         break;
-    case 2:
-        env->exception_index = 0x0a0;
-        break;
     }
     return 1;
 }