#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/personality.h>
-#include <linux/suspend.h>
+#include <linux/freezer.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
unsigned long GOT;
};
-asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
-
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
asmlinkage int sys_sigsuspend(int history0, int history1, old_sigset_t mask)
{
- sigset_t saveset;
-
mask &= _BLOCKABLE;
spin_lock_irq(¤t->sighand->siglock);
- saveset = current->blocked;
+ current->saved_sigmask = current->blocked;
siginitset(¤t->blocked, mask);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- __frame->gr8 = -EINTR;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(__frame, &saveset))
- /* return the signal number as the return value of this function
- * - this is an utterly evil hack. syscalls should not invoke do_signal()
- * as entry.S sets regs->gr8 to the return value of the system call
- * - we can't just use sigpending() as we'd have to discard SIG_IGN signals
- * and call waitpid() if SIGCHLD needed discarding
- * - this only works on the i386 because it passes arguments to the signal
- * handler on the stack, and the return value in EAX is effectively
- * discarded
- */
- return __frame->gr8;
- }
-}
-
-asmlinkage int sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize)
-{
- sigset_t saveset, newset;
-
- /* XXX: Don't preclude handling different sized sigset_t's. */
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
-
- if (copy_from_user(&newset, unewset, sizeof(newset)))
- return -EFAULT;
- sigdelsetmask(&newset, ~_BLOCKABLE);
-
- spin_lock_irq(¤t->sighand->siglock);
- saveset = current->blocked;
- current->blocked = newset;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- __frame->gr8 = -EINTR;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(__frame, &saveset))
- /* return the signal number as the return value of this function
- * - this is an utterly evil hack. syscalls should not invoke do_signal()
- * as entry.S sets regs->gr8 to the return value of the system call
- * - we can't just use sigpending() as we'd have to discard SIG_IGN signals
- * and call waitpid() if SIGCHLD needed discarding
- * - this only works on the i386 because it passes arguments to the signal
- * handler on the stack, and the return value in EAX is effectively
- * discarded
- */
- return __frame->gr8;
- }
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ set_thread_flag(TIF_RESTORE_SIGMASK);
+ return -ERESTARTNOHAND;
}
asmlinkage int sys_sigaction(int sig,
struct sigframe
{
- void (*pretcode)(void);
+ __sigrestore_t pretcode;
int sig;
struct sigcontext sc;
unsigned long extramask[_NSIG_WORDS-1];
struct rt_sigframe
{
- void (*pretcode)(void);
+ __sigrestore_t pretcode;
int sig;
- struct siginfo *pinfo;
- void *puc;
+ struct siginfo __user *pinfo;
+ void __user *puc;
struct siginfo info;
struct ucontext uc;
uint32_t retcode[2];
* Determine which stack to use..
*/
static inline void __user *get_sigframe(struct k_sigaction *ka,
- struct pt_regs *regs,
size_t frame_size)
{
unsigned long sp;
/* Default to using normal stack */
- sp = regs->sp;
+ sp = __frame->sp;
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
- if (! on_sig_stack(sp))
+ if (! sas_ss_flags(sp))
sp = current->sas_ss_sp + current->sas_ss_size;
}
return (void __user *) ((sp - frame_size) & ~7UL);
+
} /* end get_sigframe() */
/*****************************************************************************/
/*
*
*/
-static void setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs * regs)
+static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set)
{
struct sigframe __user *frame;
int rsig;
- frame = get_sigframe(ka, regs, sizeof(*frame));
+ frame = get_sigframe(ka, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
* setlos #__NR_sigreturn,gr7
* tira gr0,0
*/
- if (__put_user((void (*)(void))frame->retcode, &frame->pretcode) ||
+ if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) ||
__put_user(0x8efc0000|__NR_sigreturn, &frame->retcode[0]) ||
__put_user(0xc0700000, &frame->retcode[1]))
goto give_sigsegv;
}
/* set up registers for signal handler */
- regs->sp = (unsigned long) frame;
- regs->lr = (unsigned long) &frame->retcode;
- regs->gr8 = sig;
+ __frame->sp = (unsigned long) frame;
+ __frame->lr = (unsigned long) &frame->retcode;
+ __frame->gr8 = sig;
if (get_personality & FDPIC_FUNCPTRS) {
struct fdpic_func_descriptor __user *funcptr =
- (struct fdpic_func_descriptor *) ka->sa.sa_handler;
- __get_user(regs->pc, &funcptr->text);
- __get_user(regs->gr15, &funcptr->GOT);
+ (struct fdpic_func_descriptor __user *) ka->sa.sa_handler;
+ __get_user(__frame->pc, &funcptr->text);
+ __get_user(__frame->gr15, &funcptr->GOT);
} else {
- regs->pc = (unsigned long) ka->sa.sa_handler;
- regs->gr15 = 0;
+ __frame->pc = (unsigned long) ka->sa.sa_handler;
+ __frame->gr15 = 0;
}
set_fs(USER_DS);
+ /* the tracer may want to single-step inside the handler */
+ if (test_thread_flag(TIF_SINGLESTEP))
+ ptrace_notify(SIGTRAP);
+
#if DEBUG_SIG
printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
- sig, current->comm, current->pid, frame, regs->pc, frame->pretcode);
+ sig, current->comm, current->pid, frame, __frame->pc,
+ frame->pretcode);
#endif
- return;
+ return 0;
give_sigsegv:
- if (sig == SIGSEGV)
- ka->sa.sa_handler = SIG_DFL;
-
force_sig(SIGSEGV, current);
+ return -EFAULT;
+
} /* end setup_frame() */
/*****************************************************************************/
/*
*
*/
-static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs * regs)
+static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set)
{
struct rt_sigframe __user *frame;
int rsig;
- frame = get_sigframe(ka, regs, sizeof(*frame));
+ frame = get_sigframe(ka, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
/* Create the ucontext. */
if (__put_user(0, &frame->uc.uc_flags) ||
- __put_user(0, &frame->uc.uc_link) ||
- __put_user((void*)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
- __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
+ __put_user(NULL, &frame->uc.uc_link) ||
+ __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
+ __put_user(sas_ss_flags(__frame->sp), &frame->uc.uc_stack.ss_flags) ||
__put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size))
goto give_sigsegv;
* setlos #__NR_sigreturn,gr7
* tira gr0,0
*/
- if (__put_user((void (*)(void))frame->retcode, &frame->pretcode) ||
+ if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) ||
__put_user(0x8efc0000|__NR_rt_sigreturn, &frame->retcode[0]) ||
__put_user(0xc0700000, &frame->retcode[1]))
goto give_sigsegv;
}
/* Set up registers for signal handler */
- regs->sp = (unsigned long) frame;
- regs->lr = (unsigned long) &frame->retcode;
- regs->gr8 = sig;
- regs->gr9 = (unsigned long) &frame->info;
+ __frame->sp = (unsigned long) frame;
+ __frame->lr = (unsigned long) &frame->retcode;
+ __frame->gr8 = sig;
+ __frame->gr9 = (unsigned long) &frame->info;
if (get_personality & FDPIC_FUNCPTRS) {
- struct fdpic_func_descriptor *funcptr =
+ struct fdpic_func_descriptor __user *funcptr =
(struct fdpic_func_descriptor __user *) ka->sa.sa_handler;
- __get_user(regs->pc, &funcptr->text);
- __get_user(regs->gr15, &funcptr->GOT);
+ __get_user(__frame->pc, &funcptr->text);
+ __get_user(__frame->gr15, &funcptr->GOT);
} else {
- regs->pc = (unsigned long) ka->sa.sa_handler;
- regs->gr15 = 0;
+ __frame->pc = (unsigned long) ka->sa.sa_handler;
+ __frame->gr15 = 0;
}
set_fs(USER_DS);
+ /* the tracer may want to single-step inside the handler */
+ if (test_thread_flag(TIF_SINGLESTEP))
+ ptrace_notify(SIGTRAP);
+
#if DEBUG_SIG
printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
- sig, current->comm, current->pid, frame, regs->pc, frame->pretcode);
+ sig, current->comm, current->pid, frame, __frame->pc,
+ frame->pretcode);
#endif
- return;
+ return 0;
give_sigsegv:
- if (sig == SIGSEGV)
- ka->sa.sa_handler = SIG_DFL;
force_sig(SIGSEGV, current);
+ return -EFAULT;
} /* end setup_rt_frame() */
/*
* OK, we're invoking a handler
*/
-static void handle_signal(unsigned long sig, siginfo_t *info,
- struct k_sigaction *ka, sigset_t *oldset,
- struct pt_regs *regs)
+static int handle_signal(unsigned long sig, siginfo_t *info,
+ struct k_sigaction *ka, sigset_t *oldset)
{
+ int ret;
+
/* Are we from a system call? */
- if (in_syscall(regs)) {
+ if (in_syscall(__frame)) {
/* If so, check system call restarting.. */
- switch (regs->gr8) {
+ switch (__frame->gr8) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
- regs->gr8 = -EINTR;
+ __frame->gr8 = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
- regs->gr8 = -EINTR;
+ __frame->gr8 = -EINTR;
break;
}
+
/* fallthrough */
case -ERESTARTNOINTR:
- regs->gr8 = regs->orig_gr8;
- regs->pc -= 4;
+ __frame->gr8 = __frame->orig_gr8;
+ __frame->pc -= 4;
}
}
/* Set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
- setup_rt_frame(sig, ka, info, oldset, regs);
+ ret = setup_rt_frame(sig, ka, info, oldset);
else
- setup_frame(sig, ka, oldset, regs);
+ ret = setup_frame(sig, ka, oldset);
+
+ if (ret == 0) {
+ spin_lock_irq(¤t->sighand->siglock);
+ sigorsets(¤t->blocked, ¤t->blocked,
+ &ka->sa.sa_mask);
+ if (!(ka->sa.sa_flags & SA_NODEFER))
+ sigaddset(¤t->blocked, sig);
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+ }
+
+ return ret;
- spin_lock_irq(¤t->sighand->siglock);
- sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
- if (!(ka->sa.sa_flags & SA_NODEFER))
- sigaddset(¤t->blocked, sig);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
} /* end handle_signal() */
/*****************************************************************************/
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
-int do_signal(struct pt_regs *regs, sigset_t *oldset)
+static void do_signal(void)
{
struct k_sigaction ka;
siginfo_t info;
+ sigset_t *oldset;
int signr;
/*
* kernel mode. Just return without doing anything
* if so.
*/
- if (!user_mode(regs))
- return 1;
+ if (!user_mode(__frame))
+ return;
if (try_to_freeze())
goto no_signal;
- if (!oldset)
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = ¤t->saved_sigmask;
+ else
oldset = ¤t->blocked;
- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+ signr = get_signal_to_deliver(&info, &ka, __frame, NULL);
if (signr > 0) {
- handle_signal(signr, &info, &ka, oldset, regs);
- return 1;
+ if (handle_signal(signr, &info, &ka, oldset) == 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);
+ }
+
+ return;
}
- no_signal:
+no_signal:
/* Did we come from a system call? */
- if (regs->syscallno >= 0) {
+ if (__frame->syscallno >= 0) {
/* Restart the system call - no handlers present */
- if (regs->gr8 == -ERESTARTNOHAND ||
- regs->gr8 == -ERESTARTSYS ||
- regs->gr8 == -ERESTARTNOINTR) {
- regs->gr8 = regs->orig_gr8;
- regs->pc -= 4;
- }
+ switch (__frame->gr8) {
+ case -ERESTARTNOHAND:
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
+ __frame->gr8 = __frame->orig_gr8;
+ __frame->pc -= 4;
+ break;
- if (regs->gr8 == -ERESTART_RESTARTBLOCK){
- regs->gr8 = __NR_restart_syscall;
- regs->pc -= 4;
+ case -ERESTART_RESTARTBLOCK:
+ __frame->gr8 = __NR_restart_syscall;
+ __frame->pc -= 4;
+ break;
}
}
- return 0;
+ /* 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);
+ sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
+ }
+
} /* end do_signal() */
/*****************************************************************************/
/*
* notification of userspace execution resumption
- * - triggered by current->work.notify_resume
+ * - triggered by the TIF_WORK_MASK flags
*/
asmlinkage void do_notify_resume(__u32 thread_info_flags)
{
clear_thread_flag(TIF_SINGLESTEP);
/* deal with pending signal delivery */
- if (thread_info_flags & _TIF_SIGPENDING)
- do_signal(__frame, NULL);
+ if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+ do_signal();
} /* end do_notify_resume() */
projects / linux-drm-fsl-dcu.git / blobdiff