* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
*/
+#include <linux/list.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
+#include <linux/personality.h>
+#include <linux/binfmts.h>
+#include <linux/suspend.h>
#include <linux/kernel.h>
+#include <linux/ptrace.h>
#include <linux/signal.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
#include <linux/errno.h>
+#include <linux/sched.h>
#include <linux/wait.h>
-#include <linux/unistd.h>
-#include <linux/stddef.h>
-#include <linux/personality.h>
-#include <linux/suspend.h>
-#include <linux/ptrace.h>
#include <linux/elf.h>
-#include <linux/binfmts.h>
+#include <linux/smp.h>
+#include <linux/mm.h>
+
#include <asm/processor.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/i387.h>
#include <asm/vdso.h>
+
#include "sigframe.h"
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
+
return -ERESTARTNOHAND;
}
-asmlinkage int
+asmlinkage int
sys_sigaction(int sig, const struct old_sigaction __user *act,
struct old_sigaction __user *oact)
{
if (act) {
old_sigset_t mask;
+
if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
return -EFAULT;
+
__get_user(new_ka.sa.sa_flags, &act->sa_flags);
__get_user(mask, &act->sa_mask);
siginitset(&new_ka.sa.sa_mask, mask);
__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
return -EFAULT;
+
__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
}
return ret;
}
-asmlinkage int
-sys_sigaltstack(unsigned long bx)
+asmlinkage int sys_sigaltstack(unsigned long bx)
{
- /* This is needed to make gcc realize it doesn't own the "struct pt_regs" */
+ /*
+ * This is needed to make gcc realize it doesn't own the
+ * "struct pt_regs"
+ */
struct pt_regs *regs = (struct pt_regs *)&bx;
const stack_t __user *uss = (const stack_t __user *)bx;
stack_t __user *uoss = (stack_t __user *)regs->cx;
#define GET_SEG(seg) \
{ unsigned short tmp; \
err |= __get_user(tmp, &sc->seg); \
- loadsegment(seg,tmp); }
+ loadsegment(seg, tmp); }
GET_SEG(gs);
COPY_SEG(fs);
COPY(dx); COPY(cx); COPY(ip);
COPY_SEG_STRICT(cs);
COPY_SEG_STRICT(ss);
-
+
{
unsigned int tmpflags;
+
err |= __get_user(tmpflags, &sc->flags);
- regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
+ regs->flags = (regs->flags & ~FIX_EFLAGS) |
+ (tmpflags & FIX_EFLAGS);
regs->orig_ax = -1; /* disable syscall checks */
}
{
- struct _fpstate __user * buf;
+ struct _fpstate __user *buf;
+
err |= __get_user(buf, &sc->fpstate);
if (buf) {
if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
err |= restore_i387(buf);
} else {
struct task_struct *me = current;
+
if (used_math()) {
clear_fpu(me);
clear_used_math();
asmlinkage unsigned long sys_sigreturn(unsigned long __unused)
{
- struct pt_regs *regs = (struct pt_regs *) &__unused;
- struct sigframe __user *frame = (struct sigframe __user *)(regs->sp - 8);
- sigset_t set;
+ struct sigframe __user *frame;
+ struct pt_regs *regs;
unsigned long ax;
+ sigset_t set;
+
+ regs = (struct pt_regs *) &__unused;
+ frame = (struct sigframe __user *)(regs->sp - 8);
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
- if (__get_user(set.sig[0], &frame->sc.oldmask)
- || (_NSIG_WORDS > 1
+ if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1
&& __copy_from_user(&set.sig[1], &frame->extramask,
sizeof(frame->extramask))))
goto badframe;
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
-
+
if (restore_sigcontext(regs, &frame->sc, &ax))
goto badframe;
return ax;
}
force_sig(SIGSEGV, current);
+
return 0;
-}
+}
asmlinkage int sys_rt_sigreturn(unsigned long __unused)
{
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
-
+
if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
goto badframe;
badframe:
force_sig(SIGSEGV, current);
return 0;
-}
+}
/*
* Set up a signal frame.
*/
-
static int
setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
struct pt_regs *regs, unsigned long mask)
tmp = save_i387(fpstate);
if (tmp < 0)
- err = 1;
+ err = 1;
else
- err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
+ err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
/* non-iBCS2 extensions.. */
err |= __put_user(mask, &sc->oldmask);
* Determine which stack to use..
*/
static inline void __user *
-get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
+get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
{
unsigned long sp;
if (ka->sa.sa_flags & SA_ONSTACK) {
if (sas_ss_flags(sp) == 0)
sp = current->sas_ss_sp + current->sas_ss_size;
- }
-
- /* This is the legacy signal stack switching. */
- else if ((regs->ss & 0xffff) != __USER_DS &&
- !(ka->sa.sa_flags & SA_RESTORER) &&
- ka->sa.sa_restorer) {
- sp = (unsigned long) ka->sa.sa_restorer;
+ } else {
+ /* This is the legacy signal stack switching. */
+ if ((regs->ss & 0xffff) != __USER_DS &&
+ !(ka->sa.sa_flags & SA_RESTORER) &&
+ ka->sa.sa_restorer)
+ sp = (unsigned long) ka->sa.sa_restorer;
}
sp -= frame_size;
- /* Align the stack pointer according to the i386 ABI,
- * i.e. so that on function entry ((sp + 4) & 15) == 0. */
+ /*
+ * Align the stack pointer according to the i386 ABI,
+ * i.e. so that on function entry ((sp + 4) & 15) == 0.
+ */
sp = ((sp + 4) & -16ul) - 4;
+
return (void __user *) sp;
}
-/* These symbols are defined with the addresses in the vsyscall page.
- See vsyscall-sigreturn.S. */
+/*
+ * These symbols are defined with the addresses in the vsyscall page.
+ * See vsyscall-sigreturn.S.
+ */
extern void __user __kernel_sigreturn;
extern void __user __kernel_rt_sigreturn;
-static int 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 pt_regs *regs)
{
- void __user *restorer;
struct sigframe __user *frame;
+ void __user *restorer;
int err = 0;
int usig;
/* Set up to return from userspace. */
err |= __put_user(restorer, &frame->pretcode);
-
+
/*
- * This is popl %eax ; movl $,%eax ; int $0x80
+ * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
*
* WE DO NOT USE IT ANY MORE! It's only left here for historical
* reasons and because gdb uses it as a signature to notice
goto give_sigsegv;
/* Set up registers for signal handler */
- regs->sp = (unsigned long) frame;
- regs->ip = (unsigned long) ka->sa.sa_handler;
- regs->ax = (unsigned long) sig;
+ regs->sp = (unsigned long)frame;
+ regs->ip = (unsigned long)ka->sa.sa_handler;
+ regs->ax = (unsigned long)sig;
regs->dx = 0;
regs->cx = 0;
}
static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs * regs)
+ sigset_t *set, struct pt_regs *regs)
{
- void __user *restorer;
struct rt_sigframe __user *frame;
+ void __user *restorer;
int err = 0;
int usig;
&frame->uc.uc_stack.ss_flags);
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
- regs, set->sig[0]);
+ regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
goto give_sigsegv;
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
err |= __put_user(restorer, &frame->pretcode);
-
+
/*
- * This is movl $,%ax ; int $0x80
+ * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
*
* WE DO NOT USE IT ANY MORE! It's only left here for historical
* reasons and because gdb uses it as a signature to notice
goto give_sigsegv;
/* Set up registers for signal handler */
- regs->sp = (unsigned long) frame;
- regs->ip = (unsigned long) ka->sa.sa_handler;
- regs->ax = (unsigned long) usig;
- regs->dx = (unsigned long) &frame->info;
- regs->cx = (unsigned long) &frame->uc;
+ regs->sp = (unsigned long)frame;
+ regs->ip = (unsigned long)ka->sa.sa_handler;
+ regs->ax = (unsigned long)usig;
+ regs->dx = (unsigned long)&frame->info;
+ regs->cx = (unsigned long)&frame->uc;
regs->ds = __USER_DS;
regs->es = __USER_DS;
}
/*
- * OK, we're invoking a handler
- */
-
+ * OK, we're invoking a handler:
+ */
static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
else
ret = setup_frame(sig, ka, oldset, regs);
- 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);
- }
+ if (ret)
+ return ret;
- 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);
+
+ return 0;
}
/*
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
- /* Re-enable any watchpoints before delivering the
+ /*
+ * Re-enable any watchpoints before delivering the
* signal to user space. The processor register will
* have been cleared if the watchpoint triggered
* inside the kernel.
if (current->thread.debugreg7)
set_debugreg(current->thread.debugreg7, 7);
- /* Whee! Actually deliver the signal. */
+ /* Whee! Actually deliver the signal. */
if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
- /* a signal was successfully delivered; the saved
+ /*
+ * 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 */
+ * clear the TIF_RESTORE_SIGMASK flag
+ */
if (test_thread_flag(TIF_RESTORE_SIGMASK))
clear_thread_flag(TIF_RESTORE_SIGMASK);
}
-
return;
}
* notification of userspace execution resumption
* - triggered by the TIF_WORK_MASK flags
*/
-void do_notify_resume(struct pt_regs *regs, void *unused,
- __u32 thread_info_flags)
+void
+do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
{
/* Pending single-step? */
if (thread_info_flags & _TIF_SINGLESTEP) {
if (thread_info_flags & _TIF_HRTICK_RESCHED)
hrtick_resched();
-
+
clear_thread_flag(TIF_IRET);
}
projects / firefly-linux-kernel-4.4.55.git / commitdiff