1 files changed, 72 insertions, 166 deletions

diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c
index d54c6e53aba..9ee72fc8e0e 100644
--- a/arch/sparc/kernel/signal_32.c
+++ b/arch/sparc/kernel/signal_32.c
@@ -25,10 +25,10 @@
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
 #include <asm/cacheflush.h>	/* flush_sig_insns */
+#include <asm/switch_to.h>
 
 #include "sigutil.h"
-
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+#include "kernel.h"
 
 extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
 		   void *fpqueue, unsigned long *fpqdepth);
@@ -60,28 +60,6 @@ struct rt_signal_frame {
 #define SF_ALIGNEDSZ  (((sizeof(struct signal_frame) + 7) & (~7)))
 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
 
-static int _sigpause_common(old_sigset_t set)
-{
-	sigset_t blocked;
-
-	current->saved_sigmask = current->blocked;
-
-	set &= _BLOCKABLE;
-	siginitset(&blocked, set);
-	set_current_blocked(&blocked);
-
-	current->state = TASK_INTERRUPTIBLE;
-	schedule();
-	set_thread_flag(TIF_RESTORE_SIGMASK);
-
-	return -ERESTARTNOHAND;
-}
-
-asmlinkage int sys_sigsuspend(old_sigset_t set)
-{
-	return _sigpause_common(set);
-}
-
 asmlinkage void do_sigreturn(struct pt_regs *regs)
 {
 	struct signal_frame __user *sf;
@@ -139,7 +117,6 @@ asmlinkage void do_sigreturn(struct pt_regs *regs)
 	if (err)
 		goto segv_and_exit;
 
-	sigdelsetmask(&set, ~_BLOCKABLE);
 	set_current_blocked(&set);
 	return;
 
@@ -153,9 +130,7 @@ asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
 	unsigned int psr, pc, npc;
 	__siginfo_fpu_t __user *fpu_save;
 	__siginfo_rwin_t __user *rwin_save;
-	mm_segment_t old_fs;
 	sigset_t set;
-	stack_t st;
 	int err;
 
 	synchronize_user_stack();
@@ -183,8 +158,7 @@ asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
 	if (!err && fpu_save)
 		err |= restore_fpu_state(regs, fpu_save);
 	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
-	
-	err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
+	err |= restore_altstack(&sf->stack);
 	
 	if (err)
 		goto segv;
@@ -192,21 +166,12 @@ asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
 	regs->pc = pc;
 	regs->npc = npc;
 	
-	/* It is more difficult to avoid calling this function than to
-	 * call it and ignore errors.
-	 */
-	old_fs = get_fs();
-	set_fs(KERNEL_DS);
-	do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
-	set_fs(old_fs);
-
 	err |= __get_user(rwin_save, &sf->rwin_save);
 	if (!err && rwin_save) {
 		if (restore_rwin_state(rwin_save))
 			goto segv;
 	}
 
-	sigdelsetmask(&set, ~_BLOCKABLE);
 	set_current_blocked(&set);
 	return;
 segv:
@@ -216,16 +181,13 @@ segv:
 /* Checks if the fp is valid */
 static inline int invalid_frame_pointer(void __user *fp, int fplen)
 {
-	if ((((unsigned long) fp) & 7) ||
-	    !__access_ok((unsigned long)fp, fplen) ||
-	    ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
-	     ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
+	if ((((unsigned long) fp) & 7) || !__access_ok((unsigned long)fp, fplen))
 		return 1;
-	
+
 	return 0;
 }
 
-static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
+static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
 {
 	unsigned long sp = regs->u_regs[UREG_FP];
 
@@ -237,12 +199,7 @@ static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *re
 		return (void __user *) -1L;
 
 	/* This is the X/Open sanctioned signal stack switching.  */
-	if (sa->sa_flags & SA_ONSTACK) {
-		if (sas_ss_flags(sp) == 0)
-			sp = current->sas_ss_sp + current->sas_ss_size;
-	}
-
-	sp -= framesize;
+	sp = sigsp(sp, ksig) - framesize;
 
 	/* Always align the stack frame.  This handles two cases.  First,
 	 * sigaltstack need not be mindful of platform specific stack
@@ -255,8 +212,8 @@ static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *re
 	return (void __user *) sp;
 }
 
-static int setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
-		       int signo, sigset_t *oldset)
+static int setup_frame(struct ksignal *ksig, struct pt_regs *regs,
+		       sigset_t *oldset)
 {
 	struct signal_frame __user *sf;
 	int sigframe_size, err, wsaved;
@@ -274,10 +231,12 @@ static int setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
 		sigframe_size += sizeof(__siginfo_rwin_t);
 
 	sf = (struct signal_frame __user *)
-		get_sigframe(&ka->sa, regs, sigframe_size);
+		get_sigframe(ksig, regs, sigframe_size);
 
-	if (invalid_frame_pointer(sf, sigframe_size))
-		goto sigill_and_return;
+	if (invalid_frame_pointer(sf, sigframe_size)) {
+		do_exit(SIGILL);
+		return -EINVAL;
+	}
 
 	tail = sf + 1;
 
@@ -316,21 +275,21 @@ static int setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
 		err |= __copy_to_user(sf, rp, sizeof(struct reg_window32));
 	}
 	if (err)
-		goto sigsegv;
+		return err;
 	
 	/* 3. signal handler back-trampoline and parameters */
 	regs->u_regs[UREG_FP] = (unsigned long) sf;
-	regs->u_regs[UREG_I0] = signo;
+	regs->u_regs[UREG_I0] = ksig->sig;
 	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 	regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
 
 	/* 4. signal handler */
-	regs->pc = (unsigned long) ka->sa.sa_handler;
+	regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
 	regs->npc = (regs->pc + 4);
 
 	/* 5. return to kernel instructions */
-	if (ka->ka_restorer)
-		regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
+	if (ksig->ka.ka_restorer)
+		regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
 	else {
 		regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 
@@ -340,24 +299,16 @@ static int setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
 		/* t 0x10 */
 		err |= __put_user(0x91d02010, &sf->insns[1]);
 		if (err)
-			goto sigsegv;
+			return err;
 
 		/* Flush instruction space. */
 		flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 	}
 	return 0;
-
-sigill_and_return:
-	do_exit(SIGILL);
-	return -EINVAL;
-
-sigsegv:
-	force_sigsegv(signo, current);
-	return -EFAULT;
 }
 
-static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
-			  int signo, sigset_t *oldset, siginfo_t *info)
+static int setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs,
+			  sigset_t *oldset)
 {
 	struct rt_signal_frame __user *sf;
 	int sigframe_size, wsaved;
@@ -373,9 +324,11 @@ static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 	if (wsaved)
 		sigframe_size += sizeof(__siginfo_rwin_t);
 	sf = (struct rt_signal_frame __user *)
-		get_sigframe(&ka->sa, regs, sigframe_size);
-	if (invalid_frame_pointer(sf, sigframe_size))
-		goto sigill;
+		get_sigframe(ksig, regs, sigframe_size);
+	if (invalid_frame_pointer(sf, sigframe_size)) {
+		do_exit(SIGILL);
+		return -EINVAL;
+	}
 
 	tail = sf + 1;
 	err  = __put_user(regs->pc, &sf->regs.pc);
@@ -389,7 +342,7 @@ static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 	err |= __put_user(0, &sf->extra_size);
 
 	if (psr & PSR_EF) {
-		__siginfo_fpu_t *fp = tail;
+		__siginfo_fpu_t __user *fp = tail;
 		tail += sizeof(*fp);
 		err |= save_fpu_state(regs, fp);
 		err |= __put_user(fp, &sf->fpu_save);
@@ -397,7 +350,7 @@ static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 		err |= __put_user(0, &sf->fpu_save);
 	}
 	if (wsaved) {
-		__siginfo_rwin_t *rwp = tail;
+		__siginfo_rwin_t __user *rwp = tail;
 		tail += sizeof(*rwp);
 		err |= save_rwin_state(wsaved, rwp);
 		err |= __put_user(rwp, &sf->rwin_save);
@@ -407,9 +360,7 @@ static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 	err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
 	
 	/* Setup sigaltstack */
-	err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
-	err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
-	err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
+	err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
 	
 	if (!wsaved) {
 		err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
@@ -421,21 +372,21 @@ static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 		err |= __copy_to_user(sf, rp, sizeof(struct reg_window32));
 	}
 
-	err |= copy_siginfo_to_user(&sf->info, info);
+	err |= copy_siginfo_to_user(&sf->info, &ksig->info);
 
 	if (err)
-		goto sigsegv;
+		return err;
 
 	regs->u_regs[UREG_FP] = (unsigned long) sf;
-	regs->u_regs[UREG_I0] = signo;
+	regs->u_regs[UREG_I0] = ksig->sig;
 	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 	regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
 
-	regs->pc = (unsigned long) ka->sa.sa_handler;
+	regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
 	regs->npc = (regs->pc + 4);
 
-	if (ka->ka_restorer)
-		regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
+	if (ksig->ka.ka_restorer)
+		regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
 	else {
 		regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 
@@ -445,45 +396,25 @@ static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 		/* t 0x10 */
 		err |= __put_user(0x91d02010, &sf->insns[1]);
 		if (err)
-			goto sigsegv;
+			return err;
 
 		/* Flush instruction space. */
 		flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 	}
 	return 0;
-
-sigill:
-	do_exit(SIGILL);
-	return -EINVAL;
-
-sigsegv:
-	force_sigsegv(signo, current);
-	return -EFAULT;
 }
 
-static inline int
-handle_signal(unsigned long signr, struct k_sigaction *ka,
-	      siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
+static inline void
+handle_signal(struct ksignal *ksig, struct pt_regs *regs)
 {
-	sigset_t blocked;
+	sigset_t *oldset = sigmask_to_save();
 	int err;
 
-	if (ka->sa.sa_flags & SA_SIGINFO)
-		err = setup_rt_frame(ka, regs, signr, oldset, info);
+	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
+		err = setup_rt_frame(ksig, regs, oldset);
 	else
-		err = setup_frame(ka, regs, signr, oldset);
-
-	if (err)
-		return err;
-
-	sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
-	if (!(ka->sa.sa_flags & SA_NOMASK))
-		sigaddset(&blocked, signr);
-	set_current_blocked(&blocked);
-
-	tracehook_signal_handler(signr, info, ka, regs, 0);
-
-	return 0;
+		err = setup_frame(ksig, regs, oldset);
+	signal_setup_done(err, ksig, 0);
 }
 
 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
@@ -513,11 +444,9 @@ static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
  */
 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
 {
-	struct k_sigaction ka;
+	struct ksignal ksig;
 	int restart_syscall;
-	sigset_t *oldset;
-	siginfo_t info;
-	int signr;
+	bool has_handler;
 
 	/* It's a lot of work and synchronization to add a new ptrace
 	 * register for GDB to save and restore in order to get
@@ -540,12 +469,7 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
 	if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C))
 		regs->u_regs[UREG_G6] = orig_i0;
 
-	if (test_thread_flag(TIF_RESTORE_SIGMASK))
-		oldset = &current->saved_sigmask;
-	else
-		oldset = &current->blocked;
-
-	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+	has_handler = get_signal(&ksig);
 
 	/* If the debugger messes with the program counter, it clears
 	 * the software "in syscall" bit, directing us to not perform
@@ -557,64 +481,46 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
 		orig_i0 = regs->u_regs[UREG_G6];
 	}
 
-
-	if (signr > 0) {
+	if (has_handler) {
 		if (restart_syscall)
-			syscall_restart(orig_i0, regs, &ka.sa);
-		if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
-			/* a signal was successfully delivered; the saved
-			 * sigmask will have been stored in the signal frame,
-			 * and will be restored by sigreturn, so we can simply
-			 * clear the TIF_RESTORE_SIGMASK flag.
-			 */
-			if (test_thread_flag(TIF_RESTORE_SIGMASK))
-				clear_thread_flag(TIF_RESTORE_SIGMASK);
+			syscall_restart(orig_i0, regs, &ksig.ka.sa);
+		handle_signal(&ksig, regs);
+	} else {
+		if (restart_syscall) {
+			switch (regs->u_regs[UREG_I0]) {
+			case ERESTARTNOHAND:
+	     		case ERESTARTSYS:
+			case ERESTARTNOINTR:
+				/* replay the system call when we are done */
+				regs->u_regs[UREG_I0] = orig_i0;
+				regs->pc -= 4;
+				regs->npc -= 4;
+				pt_regs_clear_syscall(regs);
+			case ERESTART_RESTARTBLOCK:
+				regs->u_regs[UREG_G1] = __NR_restart_syscall;
+				regs->pc -= 4;
+				regs->npc -= 4;
+				pt_regs_clear_syscall(regs);
+			}
 		}
-		return;
-	}
-	if (restart_syscall &&
-	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
-	     regs->u_regs[UREG_I0] == ERESTARTSYS ||
-	     regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
-		/* replay the system call when we are done */
-		regs->u_regs[UREG_I0] = orig_i0;
-		regs->pc -= 4;
-		regs->npc -= 4;
-		pt_regs_clear_syscall(regs);
-	}
-	if (restart_syscall &&
-	    regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
-		regs->u_regs[UREG_G1] = __NR_restart_syscall;
-		regs->pc -= 4;
-		regs->npc -= 4;
-		pt_regs_clear_syscall(regs);
-	}
-
-	/* if there's no signal to deliver, we just put the saved sigmask
-	 * back
-	 */
-	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
-		clear_thread_flag(TIF_RESTORE_SIGMASK);
-		set_current_blocked(&current->saved_sigmask);
+		restore_saved_sigmask();
 	}
 }
 
 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0,
 		      unsigned long thread_info_flags)
 {
-	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+	if (thread_info_flags & _TIF_SIGPENDING)
 		do_signal(regs, orig_i0);
 	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
 		clear_thread_flag(TIF_NOTIFY_RESUME);
 		tracehook_notify_resume(regs);
-		if (current->replacement_session_keyring)
-			key_replace_session_keyring();
 	}
 }
 
-asmlinkage int
-do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
-		unsigned long sp)
+asmlinkage int do_sys_sigstack(struct sigstack __user *ssptr,
+                               struct sigstack __user *ossptr,
+                               unsigned long sp)
 {
 	int ret = -EFAULT;