2 * Common signal handling code for both 32 and 64 bits
4 * Copyright (c) 2007 Benjamin Herrenschmidt, IBM Coproration
5 * Extracted from signal_32.c and signal_64.c
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License. See the file README.legal in the main directory of
9 * this archive for more details.
12 #include <linux/ptrace.h>
13 #include <linux/signal.h>
14 #include <asm/unistd.h>
20 static inline int is_32bit_task(void)
22 return test_thread_flag(TIF_32BIT
);
25 static inline int is_32bit_task(void)
33 * Restore the user process's signal mask
35 void restore_sigmask(sigset_t
*set
)
37 sigdelsetmask(set
, ~_BLOCKABLE
);
38 spin_lock_irq(¤t
->sighand
->siglock
);
39 current
->blocked
= *set
;
41 spin_unlock_irq(¤t
->sighand
->siglock
);
44 static void check_syscall_restart(struct pt_regs
*regs
, struct k_sigaction
*ka
,
47 unsigned long ret
= regs
->gpr
[3];
51 if (TRAP(regs
) != 0x0C00)
54 /* error signalled ? */
55 if (!(regs
->ccr
& 0x10000000))
59 case ERESTART_RESTARTBLOCK
:
61 /* ERESTARTNOHAND means that the syscall should only be
62 * restarted if there was no handler for the signal, and since
63 * we only get here if there is a handler, we dont restart.
65 restart
= !has_handler
;
68 /* ERESTARTSYS means to restart the syscall if there is no
69 * handler or the handler was registered with SA_RESTART
71 restart
= !has_handler
|| (ka
->sa
.sa_flags
& SA_RESTART
) != 0;
74 /* ERESTARTNOINTR means that the syscall should be
75 * called again after the signal handler returns.
82 if (ret
== ERESTART_RESTARTBLOCK
)
83 regs
->gpr
[0] = __NR_restart_syscall
;
85 regs
->gpr
[3] = regs
->orig_gpr3
;
89 regs
->result
= -EINTR
;
91 regs
->ccr
|= 0x10000000;
95 int do_signal(sigset_t
*oldset
, struct pt_regs
*regs
)
99 struct k_sigaction ka
;
101 int is32
= is_32bit_task();
103 if (test_thread_flag(TIF_RESTORE_SIGMASK
))
104 oldset
= ¤t
->saved_sigmask
;
106 oldset
= ¤t
->blocked
;
108 signr
= get_signal_to_deliver(&info
, &ka
, regs
, NULL
);
110 /* Is there any syscall restart business here ? */
111 check_syscall_restart(regs
, &ka
, signr
> 0);
114 /* No signal to deliver -- put the saved sigmask back */
115 if (test_thread_flag(TIF_RESTORE_SIGMASK
)) {
116 clear_thread_flag(TIF_RESTORE_SIGMASK
);
117 sigprocmask(SIG_SETMASK
, ¤t
->saved_sigmask
, NULL
);
119 return 0; /* no signals delivered */
124 * Reenable the DABR before delivering the signal to
125 * user space. The DABR will have been cleared if it
126 * triggered inside the kernel.
128 if (current
->thread
.dabr
)
129 set_dabr(current
->thread
.dabr
);
135 if ((ka
.sa
.sa_flags
& SA_ONSTACK
) &&
136 current
->sas_ss_size
&& !on_sig_stack(regs
->gpr
[1]))
137 newsp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
139 newsp
= regs
->gpr
[1];
141 if (ka
.sa
.sa_flags
& SA_SIGINFO
)
142 ret
= handle_rt_signal32(signr
, &ka
, &info
, oldset
,
145 ret
= handle_signal32(signr
, &ka
, &info
, oldset
,
149 ret
= handle_rt_signal64(signr
, &ka
, &info
, oldset
, regs
);
154 spin_lock_irq(¤t
->sighand
->siglock
);
155 sigorsets(¤t
->blocked
, ¤t
->blocked
,
157 if (!(ka
.sa
.sa_flags
& SA_NODEFER
))
158 sigaddset(¤t
->blocked
, signr
);
160 spin_unlock_irq(¤t
->sighand
->siglock
);
163 * A signal was successfully delivered; the saved sigmask is in
164 * its frame, and we can clear the TIF_RESTORE_SIGMASK flag.
166 if (test_thread_flag(TIF_RESTORE_SIGMASK
))
167 clear_thread_flag(TIF_RESTORE_SIGMASK
);
173 long sys_sigaltstack(const stack_t __user
*uss
, stack_t __user
*uoss
,
174 unsigned long r5
, unsigned long r6
, unsigned long r7
,
175 unsigned long r8
, struct pt_regs
*regs
)
177 return do_sigaltstack(uss
, uoss
, regs
->gpr
[1]);
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