return do_sigaltstack(uss, uoss, regs->sp);
}
+#define COPY(x) { \
+ err |= __get_user(regs->x, &sc->x); \
+}
+
+#define COPY_SEG(seg) { \
+ unsigned short tmp; \
+ err |= __get_user(tmp, &sc->seg); \
+ regs->seg = tmp; \
+}
+
+#define COPY_SEG_STRICT(seg) { \
+ unsigned short tmp; \
+ err |= __get_user(tmp, &sc->seg); \
+ regs->seg = tmp | 3; \
+}
+
+#define GET_SEG(seg) { \
+ unsigned short tmp; \
+ err |= __get_user(tmp, &sc->seg); \
+ loadsegment(seg, tmp); \
+}
/*
* Do a signal return; undo the signal stack.
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
unsigned long *pax)
{
+ void __user *buf;
+ unsigned int tmpflags;
unsigned int err = 0;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
-#define COPY(x) err |= __get_user(regs->x, &sc->x)
-
-#define COPY_SEG(seg) \
- { unsigned short tmp; \
- err |= __get_user(tmp, &sc->seg); \
- regs->seg = tmp; }
-
-#define COPY_SEG_STRICT(seg) \
- { unsigned short tmp; \
- err |= __get_user(tmp, &sc->seg); \
- regs->seg = tmp|3; }
-
-#define GET_SEG(seg) \
- { unsigned short tmp; \
- err |= __get_user(tmp, &sc->seg); \
- loadsegment(seg, tmp); }
-
GET_SEG(gs);
COPY_SEG(fs);
COPY_SEG(es);
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->orig_ax = -1; /* disable syscall checks */
- err |= __get_user(tmpflags, &sc->flags);
- regs->flags = (regs->flags & ~FIX_EFLAGS) |
- (tmpflags & FIX_EFLAGS);
- regs->orig_ax = -1; /* disable syscall checks */
- }
-
- {
- void __user *buf;
-
- err |= __get_user(buf, &sc->fpstate);
- err |= restore_i387_xstate(buf);
- }
+ err |= __get_user(buf, &sc->fpstate);
+ err |= restore_i387_xstate(buf);
err |= __get_user(*pax, &sc->ax);
return err;
return 0;
}
-asmlinkage int sys_rt_sigreturn(unsigned long __unused)
+static long do_rt_sigreturn(struct pt_regs *regs)
{
- struct pt_regs *regs = (struct pt_regs *)&__unused;
struct rt_sigframe __user *frame;
unsigned long ax;
sigset_t set;
return ax;
badframe:
- signal_fault(regs, frame, "rt sigreturn");
+ signal_fault(regs, frame, "rt_sigreturn");
return 0;
}
+asmlinkage int sys_rt_sigreturn(unsigned long __unused)
+{
+ struct pt_regs *regs = (struct pt_regs *)&__unused;
+
+ return do_rt_sigreturn(regs);
+}
+
/*
* Set up a signal frame.
*/
}
static int
-setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
- struct pt_regs *regs)
+__setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
+ struct pt_regs *regs)
{
struct sigframe __user *frame;
void __user *restorer;
int err = 0;
- int usig;
void __user *fpstate = NULL;
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
-
- usig = current_thread_info()->exec_domain
- && current_thread_info()->exec_domain->signal_invmap
- && sig < 32
- ? current_thread_info()->exec_domain->signal_invmap[sig]
- : sig;
+ return -EFAULT;
- err = __put_user(usig, &frame->sig);
- if (err)
- goto give_sigsegv;
+ if (__put_user(sig, &frame->sig))
+ return -EFAULT;
- err = setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]);
- if (err)
- goto give_sigsegv;
+ if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
+ return -EFAULT;
if (_NSIG_WORDS > 1) {
- err = __copy_to_user(&frame->extramask, &set->sig[1],
- sizeof(frame->extramask));
- if (err)
- goto give_sigsegv;
+ if (__copy_to_user(&frame->extramask, &set->sig[1],
+ sizeof(frame->extramask)))
+ return -EFAULT;
}
if (current->mm->context.vdso)
err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Set up registers for signal handler */
regs->sp = (unsigned long)frame;
regs->cs = __USER_CS;
return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}
-static int 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 pt_regs *regs)
{
struct rt_sigframe __user *frame;
void __user *restorer;
int err = 0;
- int usig;
void __user *fpstate = NULL;
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
-
- usig = current_thread_info()->exec_domain
- && current_thread_info()->exec_domain->signal_invmap
- && sig < 32
- ? current_thread_info()->exec_domain->signal_invmap[sig]
- : sig;
+ return -EFAULT;
- err |= __put_user(usig, &frame->sig);
+ err |= __put_user(sig, &frame->sig);
err |= __put_user(&frame->info, &frame->pinfo);
err |= __put_user(&frame->uc, &frame->puc);
err |= copy_siginfo_to_user(&frame->info, info);
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Create the ucontext. */
if (cpu_has_xsave)
regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Set up to return from userspace. */
restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* 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->ax = (unsigned long)sig;
regs->dx = (unsigned long)&frame->info;
regs->cx = (unsigned long)&frame->uc;
regs->cs = __USER_CS;
return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}
/*
* OK, we're invoking a handler:
*/
+static int signr_convert(int sig)
+{
+ struct thread_info *info = current_thread_info();
+
+ if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32)
+ return info->exec_domain->signal_invmap[sig];
+ return sig;
+}
+
+#define is_ia32 1
+#define ia32_setup_frame __setup_frame
+#define ia32_setup_rt_frame __setup_rt_frame
+
+static int
+setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
+{
+ int usig = signr_convert(sig);
+ int ret;
+
+ /* Set up the stack frame */
+ if (is_ia32) {
+ if (ka->sa.sa_flags & SA_SIGINFO)
+ ret = ia32_setup_rt_frame(usig, ka, info, set, regs);
+ else
+ ret = ia32_setup_frame(usig, ka, set, regs);
+ } else
+ ret = __setup_rt_frame(sig, ka, info, set, regs);
+
+ if (ret) {
+ force_sigsegv(sig, current);
+ return -EFAULT;
+ }
+
+ return ret;
+}
+
static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
regs->flags &= ~X86_EFLAGS_TF;
- /* Set up the stack frame */
- if (ka->sa.sa_flags & SA_SIGINFO)
- ret = setup_rt_frame(sig, ka, info, oldset, regs);
- else
- ret = setup_frame(sig, ka, oldset, regs);
+ ret = setup_rt_frame(sig, ka, info, oldset, regs);
if (ret)
return ret;
+#ifdef CONFIG_X86_64
+ /*
+ * This has nothing to do with segment registers,
+ * despite the name. This magic affects uaccess.h
+ * macros' behavior. Reset it to the normal setting.
+ */
+ set_fs(USER_DS);
+#endif
+
/*
* Clear the direction flag as per the ABI for function entry.
*/
void
do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
{
+#if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE)
+ /* notify userspace of pending MCEs */
+ if (thread_info_flags & _TIF_MCE_NOTIFY)
+ mce_notify_user();
+#endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
+
/* deal with pending signal delivery */
if (thread_info_flags & _TIF_SIGPENDING)
do_signal(regs);
tracehook_notify_resume(regs);
}
+#ifdef CONFIG_X86_32
clear_thread_flag(TIF_IRET);
+#endif /* CONFIG_X86_32 */
}
void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
git.samba.org / sfrench / cifs-2.6.git / blobdiff