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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/avr32/kernel/signal.c
e883fa5eb8451148dfc95a589e26f42677dcc6a2
2 * Copyright (C) 2004-2006 Atmel Corporation
4 * Based on linux/arch/sh/kernel/signal.c
5 * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
6 * Copyright (C) 1991, 1992 Linus Torvalds
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/sched.h>
15 #include <linux/errno.h>
16 #include <linux/ptrace.h>
17 #include <linux/unistd.h>
18 #include <linux/freezer.h>
19 #include <linux/tracehook.h>
21 #include <asm/uaccess.h>
22 #include <asm/ucontext.h>
23 #include <asm/syscalls.h>
25 asmlinkage
int sys_sigaltstack(const stack_t __user
*uss
, stack_t __user
*uoss
,
28 return do_sigaltstack(uss
, uoss
, regs
->sp
);
35 unsigned long retcode
;
39 restore_sigcontext(struct pt_regs
*regs
, struct sigcontext __user
*sc
)
43 #define COPY(x) err |= __get_user(regs->x, &sc->x)
64 * Don't allow anyone to pretend they're running in supervisor
65 * mode or something...
67 err
|= !valid_user_regs(regs
);
73 asmlinkage
int sys_rt_sigreturn(struct pt_regs
*regs
)
75 struct rt_sigframe __user
*frame
;
78 /* Always make any pending restarted system calls return -EINTR */
79 current_thread_info()->restart_block
.fn
= do_no_restart_syscall
;
81 frame
= (struct rt_sigframe __user
*)regs
->sp
;
82 pr_debug("SIG return: frame = %p\n", frame
);
84 if (!access_ok(VERIFY_READ
, frame
, sizeof(*frame
)))
87 if (__copy_from_user(&set
, &frame
->uc
.uc_sigmask
, sizeof(set
)))
90 set_current_blocked(&set
);
92 if (restore_sigcontext(regs
, &frame
->uc
.uc_mcontext
))
95 if (do_sigaltstack(&frame
->uc
.uc_stack
, NULL
, regs
->sp
) == -EFAULT
)
98 pr_debug("Context restored: pc = %08lx, lr = %08lx, sp = %08lx\n",
99 regs
->pc
, regs
->lr
, regs
->sp
);
104 force_sig(SIGSEGV
, current
);
109 setup_sigcontext(struct sigcontext __user
*sc
, struct pt_regs
*regs
)
113 #define COPY(x) err |= __put_user(regs->x, &sc->x)
136 static inline void __user
*
137 get_sigframe(struct k_sigaction
*ka
, struct pt_regs
*regs
, int framesize
)
139 unsigned long sp
= regs
->sp
;
141 if ((ka
->sa
.sa_flags
& SA_ONSTACK
) && !sas_ss_flags(sp
))
142 sp
= current
->sas_ss_sp
+ current
->sas_ss_size
;
144 return (void __user
*)((sp
- framesize
) & ~3);
148 setup_rt_frame(int sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
149 sigset_t
*set
, struct pt_regs
*regs
)
151 struct rt_sigframe __user
*frame
;
154 frame
= get_sigframe(ka
, regs
, sizeof(*frame
));
156 if (!access_ok(VERIFY_WRITE
, frame
, sizeof (*frame
)))
160 * Set up the return code:
162 * mov r8, __NR_rt_sigreturn
165 * Note: This will blow up since we're using a non-executable
166 * stack. Better use SA_RESTORER.
168 #if __NR_rt_sigreturn > 127
169 # error __NR_rt_sigreturn must be < 127 to fit in a short mov
171 err
= __put_user(0x3008d733 | (__NR_rt_sigreturn
<< 20),
174 err
|= copy_siginfo_to_user(&frame
->info
, info
);
176 /* Set up the ucontext */
177 err
|= __put_user(0, &frame
->uc
.uc_flags
);
178 err
|= __put_user(NULL
, &frame
->uc
.uc_link
);
179 err
|= __put_user((void __user
*)current
->sas_ss_sp
,
180 &frame
->uc
.uc_stack
.ss_sp
);
181 err
|= __put_user(sas_ss_flags(regs
->sp
),
182 &frame
->uc
.uc_stack
.ss_flags
);
183 err
|= __put_user(current
->sas_ss_size
,
184 &frame
->uc
.uc_stack
.ss_size
);
185 err
|= setup_sigcontext(&frame
->uc
.uc_mcontext
, regs
);
186 err
|= __copy_to_user(&frame
->uc
.uc_sigmask
, set
, sizeof(*set
));
192 regs
->r11
= (unsigned long) &frame
->info
;
193 regs
->r10
= (unsigned long) &frame
->uc
;
194 regs
->sp
= (unsigned long) frame
;
195 if (ka
->sa
.sa_flags
& SA_RESTORER
)
196 regs
->lr
= (unsigned long)ka
->sa
.sa_restorer
;
198 printk(KERN_NOTICE
"[%s:%d] did not set SA_RESTORER\n",
199 current
->comm
, current
->pid
);
200 regs
->lr
= (unsigned long) &frame
->retcode
;
203 pr_debug("SIG deliver [%s:%d]: sig=%d sp=0x%lx pc=0x%lx->0x%p lr=0x%lx\n",
204 current
->comm
, current
->pid
, sig
, regs
->sp
,
205 regs
->pc
, ka
->sa
.sa_handler
, regs
->lr
);
207 regs
->pc
= (unsigned long) ka
->sa
.sa_handler
;
213 static inline void setup_syscall_restart(struct pt_regs
*regs
)
215 if (regs
->r12
== -ERESTART_RESTARTBLOCK
)
216 regs
->r8
= __NR_restart_syscall
;
218 regs
->r12
= regs
->r12_orig
;
223 handle_signal(unsigned long sig
, struct k_sigaction
*ka
, siginfo_t
*info
,
224 struct pt_regs
*regs
, int syscall
)
229 * Set up the stack frame
231 ret
= setup_rt_frame(sig
, ka
, info
, sigmask_to_save(), regs
);
234 * Check that the resulting registers are sane
236 ret
|= !valid_user_regs(regs
);
239 * Block the signal if we were successful.
242 force_sigsegv(sig
, current
);
244 block_sigmask(ka
, sig
);
248 * Note that 'init' is a special process: it doesn't get signals it
249 * doesn't want to handle. Thus you cannot kill init even with a
250 * SIGKILL even by mistake.
252 static void do_signal(struct pt_regs
*regs
, int syscall
)
256 struct k_sigaction ka
;
259 * We want the common case to go fast, which is why we may in
260 * certain cases get here from kernel mode. Just return
261 * without doing anything if so.
263 if (!user_mode(regs
))
266 signr
= get_signal_to_deliver(&info
, &ka
, regs
, NULL
);
269 case -ERESTART_RESTARTBLOCK
:
270 case -ERESTARTNOHAND
:
277 if (signr
> 0 && !(ka
.sa
.sa_flags
& SA_RESTART
)) {
282 case -ERESTARTNOINTR
:
283 setup_syscall_restart(regs
);
288 /* No signal to deliver -- put the saved sigmask back */
289 restore_saved_sigmask();
293 handle_signal(signr
, &ka
, &info
, regs
, syscall
);
296 asmlinkage
void do_notify_resume(struct pt_regs
*regs
, struct thread_info
*ti
)
300 if ((sysreg_read(SR
) & MODE_MASK
) == MODE_SUPERVISOR
)
303 if (ti
->flags
& _TIF_SIGPENDING
))
304 do_signal(regs
, syscall
);
306 if (ti
->flags
& _TIF_NOTIFY_RESUME
) {
307 clear_thread_flag(TIF_NOTIFY_RESUME
);
308 tracehook_notify_resume(regs
);