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Linux/arch/h8300/kernel/signal.c

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  1 /*
  2  *  linux/arch/h8300/kernel/signal.c
  3  *
  4  *  Copyright (C) 1991, 1992  Linus Torvalds
  5  *
  6  * This file is subject to the terms and conditions of the GNU General Public
  7  * License.  See the file COPYING in the main directory of this archive
  8  * for more details.
  9  */
 10 
 11 /*
 12  * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
 13  *                and David McCullough <davidm@snapgear.com>
 14  *
 15  * Based on
 16  * Linux/m68k by Hamish Macdonald
 17  */
 18 
 19 /*
 20  * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
 21  * Atari :-) Current limitation: Only one sigstack can be active at one time.
 22  * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
 23  * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
 24  * signal handlers!
 25  */
 26 
 27 #include <linux/sched.h>
 28 #include <linux/sched/task_stack.h>
 29 #include <linux/mm.h>
 30 #include <linux/kernel.h>
 31 #include <linux/signal.h>
 32 #include <linux/syscalls.h>
 33 #include <linux/errno.h>
 34 #include <linux/wait.h>
 35 #include <linux/ptrace.h>
 36 #include <linux/unistd.h>
 37 #include <linux/stddef.h>
 38 #include <linux/highuid.h>
 39 #include <linux/personality.h>
 40 #include <linux/tty.h>
 41 #include <linux/binfmts.h>
 42 #include <linux/tracehook.h>
 43 
 44 #include <asm/setup.h>
 45 #include <linux/uaccess.h>
 46 #include <asm/pgtable.h>
 47 #include <asm/traps.h>
 48 #include <asm/ucontext.h>
 49 
 50 /*
 51  * Do a signal return; undo the signal stack.
 52  *
 53  * Keep the return code on the stack quadword aligned!
 54  * That makes the cache flush below easier.
 55  */
 56 
 57 struct rt_sigframe {
 58         long dummy_er0;
 59         long dummy_vector;
 60 #if defined(CONFIG_CPU_H8S)
 61         short dummy_exr;
 62 #endif
 63         long dummy_pc;
 64         char *pretcode;
 65         struct siginfo *pinfo;
 66         void *puc;
 67         unsigned char retcode[8];
 68         struct siginfo info;
 69         struct ucontext uc;
 70         int sig;
 71 } __packed __aligned(2);
 72 
 73 static inline int
 74 restore_sigcontext(struct sigcontext *usc, int *pd0)
 75 {
 76         struct pt_regs *regs = current_pt_regs();
 77         int err = 0;
 78         unsigned int ccr;
 79         unsigned int usp;
 80         unsigned int er0;
 81 
 82         /* Always make any pending restarted system calls return -EINTR */
 83         current->restart_block.fn = do_no_restart_syscall;
 84 
 85         /* restore passed registers */
 86 #define COPY(r)  do { err |= get_user(regs->r, &usc->sc_##r); } while (0)
 87         COPY(er1);
 88         COPY(er2);
 89         COPY(er3);
 90         COPY(er5);
 91         COPY(pc);
 92         ccr = regs->ccr & 0x10;
 93         COPY(ccr);
 94 #undef COPY
 95         regs->ccr &= 0xef;
 96         regs->ccr |= ccr;
 97         regs->orig_er0 = -1;            /* disable syscall checks */
 98         err |= __get_user(usp, &usc->sc_usp);
 99         regs->sp = usp;
100 
101         err |= __get_user(er0, &usc->sc_er0);
102         *pd0 = er0;
103         return err;
104 }
105 
106 asmlinkage int sys_rt_sigreturn(void)
107 {
108         unsigned long usp = rdusp();
109         struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
110         sigset_t set;
111         int er0;
112 
113         if (!access_ok(frame, sizeof(*frame)))
114                 goto badframe;
115         if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
116                 goto badframe;
117 
118         set_current_blocked(&set);
119 
120         if (restore_sigcontext(&frame->uc.uc_mcontext, &er0))
121                 goto badframe;
122 
123         if (restore_altstack(&frame->uc.uc_stack))
124                 goto badframe;
125 
126         return er0;
127 
128 badframe:
129         force_sig(SIGSEGV, current);
130         return 0;
131 }
132 
133 static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
134                              unsigned long mask)
135 {
136         int err = 0;
137 
138         err |= __put_user(regs->er0, &sc->sc_er0);
139         err |= __put_user(regs->er1, &sc->sc_er1);
140         err |= __put_user(regs->er2, &sc->sc_er2);
141         err |= __put_user(regs->er3, &sc->sc_er3);
142         err |= __put_user(regs->er4, &sc->sc_er4);
143         err |= __put_user(regs->er5, &sc->sc_er5);
144         err |= __put_user(regs->er6, &sc->sc_er6);
145         err |= __put_user(rdusp(),   &sc->sc_usp);
146         err |= __put_user(regs->pc,  &sc->sc_pc);
147         err |= __put_user(regs->ccr, &sc->sc_ccr);
148         err |= __put_user(mask,      &sc->sc_mask);
149 
150         return err;
151 }
152 
153 static inline void __user *
154 get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size)
155 {
156         return (void __user *)((sigsp(rdusp(), ksig) - frame_size) & -8UL);
157 }
158 
159 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
160                           struct pt_regs *regs)
161 {
162         struct rt_sigframe *frame;
163         int err = 0;
164         unsigned char *ret;
165 
166         frame = get_sigframe(ksig, regs, sizeof(*frame));
167 
168         if (!access_ok(frame, sizeof(*frame)))
169                 return -EFAULT;
170 
171         if (ksig->ka.sa.sa_flags & SA_SIGINFO)
172                 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
173 
174         /* Create the ucontext.  */
175         err |= __put_user(0, &frame->uc.uc_flags);
176         err |= __put_user(0, &frame->uc.uc_link);
177         err |= __save_altstack(&frame->uc.uc_stack, rdusp());
178         err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
179         err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
180         if (err)
181                 return -EFAULT;
182 
183         /* Set up to return from userspace.  */
184         ret = (unsigned char *)&frame->retcode;
185         if (ksig->ka.sa.sa_flags & SA_RESTORER)
186                 ret = (unsigned char *)(ksig->ka.sa.sa_restorer);
187         else {
188                 /* sub.l er0,er0; mov.b #__NR_rt_sigreturn,r0l; trapa #0 */
189                 err |= __put_user(0x1a80f800 + (__NR_rt_sigreturn & 0xff),
190                                   (unsigned long *)(frame->retcode + 0));
191                 err |= __put_user(0x5700,
192                                   (unsigned short *)(frame->retcode + 4));
193         }
194         err |= __put_user(ret, &frame->pretcode);
195 
196         if (err)
197                 return -EFAULT;
198 
199         /* Set up registers for signal handler */
200         regs->sp  = (unsigned long)frame;
201         regs->pc  = (unsigned long)ksig->ka.sa.sa_handler;
202         regs->er0 = ksig->sig;
203         regs->er1 = (unsigned long)&(frame->info);
204         regs->er2 = (unsigned long)&frame->uc;
205         regs->er5 = current->mm->start_data;    /* GOT base */
206 
207         return 0;
208 }
209 
210 static void
211 handle_restart(struct pt_regs *regs, struct k_sigaction *ka)
212 {
213         switch (regs->er0) {
214         case -ERESTARTNOHAND:
215                 if (!ka)
216                         goto do_restart;
217                 regs->er0 = -EINTR;
218                 break;
219         case -ERESTART_RESTARTBLOCK:
220                 if (!ka) {
221                         regs->er0 = __NR_restart_syscall;
222                         regs->pc -= 2;
223                 } else
224                         regs->er0 = -EINTR;
225                 break;
226         case -ERESTARTSYS:
227                 if (!(ka->sa.sa_flags & SA_RESTART)) {
228                         regs->er0 = -EINTR;
229                         break;
230                 }
231                 /* fallthrough */
232         case -ERESTARTNOINTR:
233 do_restart:
234                 regs->er0 = regs->orig_er0;
235                 regs->pc -= 2;
236                 break;
237         }
238 }
239 
240 /*
241  * OK, we're invoking a handler
242  */
243 static void
244 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
245 {
246         sigset_t *oldset = sigmask_to_save();
247         int ret;
248         /* are we from a system call? */
249         if (regs->orig_er0 >= 0)
250                 handle_restart(regs, &ksig->ka);
251 
252         ret = setup_rt_frame(ksig, oldset, regs);
253 
254         signal_setup_done(ret, ksig, 0);
255 }
256 
257 /*
258  * Note that 'init' is a special process: it doesn't get signals it doesn't
259  * want to handle. Thus you cannot kill init even with a SIGKILL even by
260  * mistake.
261  */
262 static void do_signal(struct pt_regs *regs)
263 {
264         struct ksignal ksig;
265 
266         current->thread.esp0 = (unsigned long) regs;
267 
268         if (get_signal(&ksig)) {
269                 /* Whee!  Actually deliver the signal.  */
270                 handle_signal(&ksig, regs);
271                 return;
272         }
273         /* Did we come from a system call? */
274         if (regs->orig_er0 >= 0)
275                 handle_restart(regs, NULL);
276 
277         /* If there's no signal to deliver, we just restore the saved mask.  */
278         restore_saved_sigmask();
279 }
280 
281 asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
282 {
283         if (thread_info_flags & _TIF_SIGPENDING)
284                 do_signal(regs);
285 
286         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
287                 clear_thread_flag(TIF_NOTIFY_RESUME);
288                 tracehook_notify_resume(regs);
289         }
290 }
291 

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