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TOMOYO Linux Cross Reference
Linux/arch/hexagon/kernel/signal.c

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  1 /*
  2  * Signal support for Hexagon processor
  3  *
  4  * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 and
  8  * only version 2 as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 18  * 02110-1301, USA.
 19  */
 20 
 21 #include <linux/linkage.h>
 22 #include <linux/syscalls.h>
 23 #include <linux/tracehook.h>
 24 #include <linux/sched/task_stack.h>
 25 
 26 #include <asm/registers.h>
 27 #include <asm/thread_info.h>
 28 #include <asm/unistd.h>
 29 #include <linux/uaccess.h>
 30 #include <asm/ucontext.h>
 31 #include <asm/cacheflush.h>
 32 #include <asm/signal.h>
 33 #include <asm/vdso.h>
 34 
 35 struct rt_sigframe {
 36         unsigned long tramp[2];
 37         struct siginfo info;
 38         struct ucontext uc;
 39 };
 40 
 41 static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
 42                           size_t frame_size)
 43 {
 44         unsigned long sp = sigsp(regs->r29, ksig);
 45 
 46         return (void __user *)((sp - frame_size) & ~(sizeof(long long) - 1));
 47 }
 48 
 49 static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
 50 {
 51         unsigned long tmp;
 52         int err = 0;
 53 
 54         err |= copy_to_user(&sc->sc_regs.r0, &regs->r00,
 55                             32*sizeof(unsigned long));
 56 
 57         err |= __put_user(regs->sa0, &sc->sc_regs.sa0);
 58         err |= __put_user(regs->lc0, &sc->sc_regs.lc0);
 59         err |= __put_user(regs->sa1, &sc->sc_regs.sa1);
 60         err |= __put_user(regs->lc1, &sc->sc_regs.lc1);
 61         err |= __put_user(regs->m0, &sc->sc_regs.m0);
 62         err |= __put_user(regs->m1, &sc->sc_regs.m1);
 63         err |= __put_user(regs->usr, &sc->sc_regs.usr);
 64         err |= __put_user(regs->preds, &sc->sc_regs.p3_0);
 65         err |= __put_user(regs->gp, &sc->sc_regs.gp);
 66         err |= __put_user(regs->ugp, &sc->sc_regs.ugp);
 67 #if CONFIG_HEXAGON_ARCH_VERSION >= 4
 68         err |= __put_user(regs->cs0, &sc->sc_regs.cs0);
 69         err |= __put_user(regs->cs1, &sc->sc_regs.cs1);
 70 #endif
 71         tmp = pt_elr(regs); err |= __put_user(tmp, &sc->sc_regs.pc);
 72         tmp = pt_cause(regs); err |= __put_user(tmp, &sc->sc_regs.cause);
 73         tmp = pt_badva(regs); err |= __put_user(tmp, &sc->sc_regs.badva);
 74 
 75         return err;
 76 }
 77 
 78 static int restore_sigcontext(struct pt_regs *regs,
 79                               struct sigcontext __user *sc)
 80 {
 81         unsigned long tmp;
 82         int err = 0;
 83 
 84         err |= copy_from_user(&regs->r00, &sc->sc_regs.r0,
 85                               32 * sizeof(unsigned long));
 86 
 87         err |= __get_user(regs->sa0, &sc->sc_regs.sa0);
 88         err |= __get_user(regs->lc0, &sc->sc_regs.lc0);
 89         err |= __get_user(regs->sa1, &sc->sc_regs.sa1);
 90         err |= __get_user(regs->lc1, &sc->sc_regs.lc1);
 91         err |= __get_user(regs->m0, &sc->sc_regs.m0);
 92         err |= __get_user(regs->m1, &sc->sc_regs.m1);
 93         err |= __get_user(regs->usr, &sc->sc_regs.usr);
 94         err |= __get_user(regs->preds, &sc->sc_regs.p3_0);
 95         err |= __get_user(regs->gp, &sc->sc_regs.gp);
 96         err |= __get_user(regs->ugp, &sc->sc_regs.ugp);
 97 #if CONFIG_HEXAGON_ARCH_VERSION >= 4
 98         err |= __get_user(regs->cs0, &sc->sc_regs.cs0);
 99         err |= __get_user(regs->cs1, &sc->sc_regs.cs1);
100 #endif
101         err |= __get_user(tmp, &sc->sc_regs.pc); pt_set_elr(regs, tmp);
102 
103         return err;
104 }
105 
106 /*
107  * Setup signal stack frame with siginfo structure
108  */
109 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
110                           struct pt_regs *regs)
111 {
112         int err = 0;
113         struct rt_sigframe __user *frame;
114         struct hexagon_vdso *vdso = current->mm->context.vdso;
115 
116         frame = get_sigframe(ksig, regs, sizeof(struct rt_sigframe));
117 
118         if (!access_ok(frame, sizeof(struct rt_sigframe)))
119                 return -EFAULT;
120 
121         if (copy_siginfo_to_user(&frame->info, &ksig->info))
122                 return -EFAULT;
123 
124         /* The on-stack signal trampoline is no longer executed;
125          * however, the libgcc signal frame unwinding code checks for
126          * the presence of these two numeric magic values.
127          */
128         err |= __put_user(0x7800d166, &frame->tramp[0]);
129         err |= __put_user(0x5400c004, &frame->tramp[1]);
130         err |= setup_sigcontext(regs, &frame->uc.uc_mcontext);
131         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
132         err |= __save_altstack(&frame->uc.uc_stack, user_stack_pointer(regs));
133         if (err)
134                 return -EFAULT;
135 
136         /* Load r0/r1 pair with signumber/siginfo pointer... */
137         regs->r0100 = ((unsigned long long)((unsigned long)&frame->info) << 32)
138                 | (unsigned long long)ksig->sig;
139         regs->r02 = (unsigned long) &frame->uc;
140         regs->r31 = (unsigned long) vdso->rt_signal_trampoline;
141         pt_psp(regs) = (unsigned long) frame;
142         pt_set_elr(regs, (unsigned long)ksig->ka.sa.sa_handler);
143 
144         return 0;
145 }
146 
147 /*
148  * Setup invocation of signal handler
149  */
150 static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
151 {
152         int ret;
153 
154         /*
155          * If we're handling a signal that aborted a system call,
156          * set up the error return value before adding the signal
157          * frame to the stack.
158          */
159 
160         if (regs->syscall_nr >= 0) {
161                 switch (regs->r00) {
162                 case -ERESTART_RESTARTBLOCK:
163                 case -ERESTARTNOHAND:
164                         regs->r00 = -EINTR;
165                         break;
166                 case -ERESTARTSYS:
167                         if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
168                                 regs->r00 = -EINTR;
169                                 break;
170                         }
171                         /* Fall through */
172                 case -ERESTARTNOINTR:
173                         regs->r06 = regs->syscall_nr;
174                         pt_set_elr(regs, pt_elr(regs) - 4);
175                         regs->r00 = regs->restart_r0;
176                         break;
177                 default:
178                         break;
179                 }
180         }
181 
182         /*
183          * Set up the stack frame; not doing the SA_SIGINFO thing.  We
184          * only set up the rt_frame flavor.
185          */
186         /* If there was an error on setup, no signal was delivered. */
187         ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
188 
189         signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
190 }
191 
192 /*
193  * Called from return-from-event code.
194  */
195 void do_signal(struct pt_regs *regs)
196 {
197         struct ksignal ksig;
198 
199         if (!user_mode(regs))
200                 return;
201 
202         if (get_signal(&ksig)) {
203                 handle_signal(&ksig, regs);
204                 return;
205         }
206 
207         /*
208          * No (more) signals; if we came from a system call, handle the restart.
209          */
210 
211         if (regs->syscall_nr >= 0) {
212                 switch (regs->r00) {
213                 case -ERESTARTNOHAND:
214                 case -ERESTARTSYS:
215                 case -ERESTARTNOINTR:
216                         regs->r06 = regs->syscall_nr;
217                         break;
218                 case -ERESTART_RESTARTBLOCK:
219                         regs->r06 = __NR_restart_syscall;
220                         break;
221                 default:
222                         goto no_restart;
223                 }
224                 pt_set_elr(regs, pt_elr(regs) - 4);
225                 regs->r00 = regs->restart_r0;
226         }
227 
228 no_restart:
229         /* If there's no signal to deliver, put the saved sigmask back */
230         restore_saved_sigmask();
231 }
232 
233 /*
234  * Architecture-specific wrappers for signal-related system calls
235  */
236 
237 asmlinkage int sys_rt_sigreturn(void)
238 {
239         struct pt_regs *regs = current_pt_regs();
240         struct rt_sigframe __user *frame;
241         sigset_t blocked;
242 
243         /* Always make any pending restarted system calls return -EINTR */
244         current->restart_block.fn = do_no_restart_syscall;
245 
246         frame = (struct rt_sigframe __user *)pt_psp(regs);
247         if (!access_ok(frame, sizeof(*frame)))
248                 goto badframe;
249         if (__copy_from_user(&blocked, &frame->uc.uc_sigmask, sizeof(blocked)))
250                 goto badframe;
251 
252         set_current_blocked(&blocked);
253 
254         if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
255                 goto badframe;
256 
257         /* Restore the user's stack as well */
258         pt_psp(regs) = regs->r29;
259 
260         regs->syscall_nr = -1;
261 
262         if (restore_altstack(&frame->uc.uc_stack))
263                 goto badframe;
264 
265         return regs->r00;
266 
267 badframe:
268         force_sig(SIGSEGV, current);
269         return 0;
270 }
271 

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