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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 <asm/registers.h>
 25 #include <asm/thread_info.h>
 26 #include <asm/unistd.h>
 27 #include <asm/uaccess.h>
 28 #include <asm/ucontext.h>
 29 #include <asm/cacheflush.h>
 30 #include <asm/signal.h>
 31 #include <asm/vdso.h>
 32 
 33 struct rt_sigframe {
 34         unsigned long tramp[2];
 35         struct siginfo info;
 36         struct ucontext uc;
 37 };
 38 
 39 static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
 40                           size_t frame_size)
 41 {
 42         unsigned long sp = sigsp(regs->r29, ksig);
 43 
 44         return (void __user *)((sp - frame_size) & ~(sizeof(long long) - 1));
 45 }
 46 
 47 static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
 48 {
 49         unsigned long tmp;
 50         int err = 0;
 51 
 52         err |= copy_to_user(&sc->sc_regs.r0, &regs->r00,
 53                             32*sizeof(unsigned long));
 54 
 55         err |= __put_user(regs->sa0, &sc->sc_regs.sa0);
 56         err |= __put_user(regs->lc0, &sc->sc_regs.lc0);
 57         err |= __put_user(regs->sa1, &sc->sc_regs.sa1);
 58         err |= __put_user(regs->lc1, &sc->sc_regs.lc1);
 59         err |= __put_user(regs->m0, &sc->sc_regs.m0);
 60         err |= __put_user(regs->m1, &sc->sc_regs.m1);
 61         err |= __put_user(regs->usr, &sc->sc_regs.usr);
 62         err |= __put_user(regs->preds, &sc->sc_regs.p3_0);
 63         err |= __put_user(regs->gp, &sc->sc_regs.gp);
 64         err |= __put_user(regs->ugp, &sc->sc_regs.ugp);
 65 #if CONFIG_HEXAGON_ARCH_VERSION >= 4
 66         err |= __put_user(regs->cs0, &sc->sc_regs.cs0);
 67         err |= __put_user(regs->cs1, &sc->sc_regs.cs1);
 68 #endif
 69         tmp = pt_elr(regs); err |= __put_user(tmp, &sc->sc_regs.pc);
 70         tmp = pt_cause(regs); err |= __put_user(tmp, &sc->sc_regs.cause);
 71         tmp = pt_badva(regs); err |= __put_user(tmp, &sc->sc_regs.badva);
 72 
 73         return err;
 74 }
 75 
 76 static int restore_sigcontext(struct pt_regs *regs,
 77                               struct sigcontext __user *sc)
 78 {
 79         unsigned long tmp;
 80         int err = 0;
 81 
 82         err |= copy_from_user(&regs->r00, &sc->sc_regs.r0,
 83                               32 * sizeof(unsigned long));
 84 
 85         err |= __get_user(regs->sa0, &sc->sc_regs.sa0);
 86         err |= __get_user(regs->lc0, &sc->sc_regs.lc0);
 87         err |= __get_user(regs->sa1, &sc->sc_regs.sa1);
 88         err |= __get_user(regs->lc1, &sc->sc_regs.lc1);
 89         err |= __get_user(regs->m0, &sc->sc_regs.m0);
 90         err |= __get_user(regs->m1, &sc->sc_regs.m1);
 91         err |= __get_user(regs->usr, &sc->sc_regs.usr);
 92         err |= __get_user(regs->preds, &sc->sc_regs.p3_0);
 93         err |= __get_user(regs->gp, &sc->sc_regs.gp);
 94         err |= __get_user(regs->ugp, &sc->sc_regs.ugp);
 95 #if CONFIG_HEXAGON_ARCH_VERSION >= 4
 96         err |= __get_user(regs->cs0, &sc->sc_regs.cs0);
 97         err |= __get_user(regs->cs1, &sc->sc_regs.cs1);
 98 #endif
 99         err |= __get_user(tmp, &sc->sc_regs.pc); pt_set_elr(regs, tmp);
100 
101         return err;
102 }
103 
104 /*
105  * Setup signal stack frame with siginfo structure
106  */
107 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
108                           struct pt_regs *regs)
109 {
110         int err = 0;
111         struct rt_sigframe __user *frame;
112         struct hexagon_vdso *vdso = current->mm->context.vdso;
113 
114         frame = get_sigframe(ksig, regs, sizeof(struct rt_sigframe));
115 
116         if (!access_ok(VERIFY_WRITE, frame, sizeof(struct rt_sigframe)))
117                 return -EFAULT;
118 
119         if (copy_siginfo_to_user(&frame->info, &ksig->info))
120                 return -EFAULT;
121 
122         /* The on-stack signal trampoline is no longer executed;
123          * however, the libgcc signal frame unwinding code checks for
124          * the presence of these two numeric magic values.
125          */
126         err |= __put_user(0x7800d166, &frame->tramp[0]);
127         err |= __put_user(0x5400c004, &frame->tramp[1]);
128         err |= setup_sigcontext(regs, &frame->uc.uc_mcontext);
129         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
130         err |= __save_altstack(&frame->uc.uc_stack, user_stack_pointer(regs));
131         if (err)
132                 return -EFAULT;
133 
134         /* Load r0/r1 pair with signumber/siginfo pointer... */
135         regs->r0100 = ((unsigned long long)((unsigned long)&frame->info) << 32)
136                 | (unsigned long long)ksig->sig;
137         regs->r02 = (unsigned long) &frame->uc;
138         regs->r31 = (unsigned long) vdso->rt_signal_trampoline;
139         pt_psp(regs) = (unsigned long) frame;
140         pt_set_elr(regs, (unsigned long)ksig->ka.sa.sa_handler);
141 
142         return 0;
143 }
144 
145 /*
146  * Setup invocation of signal handler
147  */
148 static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
149 {
150         int ret;
151 
152         /*
153          * If we're handling a signal that aborted a system call,
154          * set up the error return value before adding the signal
155          * frame to the stack.
156          */
157 
158         if (regs->syscall_nr >= 0) {
159                 switch (regs->r00) {
160                 case -ERESTART_RESTARTBLOCK:
161                 case -ERESTARTNOHAND:
162                         regs->r00 = -EINTR;
163                         break;
164                 case -ERESTARTSYS:
165                         if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
166                                 regs->r00 = -EINTR;
167                                 break;
168                         }
169                         /* Fall through */
170                 case -ERESTARTNOINTR:
171                         regs->r06 = regs->syscall_nr;
172                         pt_set_elr(regs, pt_elr(regs) - 4);
173                         regs->r00 = regs->restart_r0;
174                         break;
175                 default:
176                         break;
177                 }
178         }
179 
180         /*
181          * Set up the stack frame; not doing the SA_SIGINFO thing.  We
182          * only set up the rt_frame flavor.
183          */
184         /* If there was an error on setup, no signal was delivered. */
185         ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
186 
187         signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
188 }
189 
190 /*
191  * Called from return-from-event code.
192  */
193 void do_signal(struct pt_regs *regs)
194 {
195         struct ksignal ksig;
196 
197         if (!user_mode(regs))
198                 return;
199 
200         if (get_signal(&ksig)) {
201                 handle_signal(&ksig, regs);
202                 return;
203         }
204 
205         /*
206          * No (more) signals; if we came from a system call, handle the restart.
207          */
208 
209         if (regs->syscall_nr >= 0) {
210                 switch (regs->r00) {
211                 case -ERESTARTNOHAND:
212                 case -ERESTARTSYS:
213                 case -ERESTARTNOINTR:
214                         regs->r06 = regs->syscall_nr;
215                         break;
216                 case -ERESTART_RESTARTBLOCK:
217                         regs->r06 = __NR_restart_syscall;
218                         break;
219                 default:
220                         goto no_restart;
221                 }
222                 pt_set_elr(regs, pt_elr(regs) - 4);
223                 regs->r00 = regs->restart_r0;
224         }
225 
226 no_restart:
227         /* If there's no signal to deliver, put the saved sigmask back */
228         restore_saved_sigmask();
229 }
230 
231 /*
232  * Architecture-specific wrappers for signal-related system calls
233  */
234 
235 asmlinkage int sys_rt_sigreturn(void)
236 {
237         struct pt_regs *regs = current_pt_regs();
238         struct rt_sigframe __user *frame;
239         sigset_t blocked;
240 
241         /* Always make any pending restarted system calls return -EINTR */
242         current->restart_block.fn = do_no_restart_syscall;
243 
244         frame = (struct rt_sigframe __user *)pt_psp(regs);
245         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
246                 goto badframe;
247         if (__copy_from_user(&blocked, &frame->uc.uc_sigmask, sizeof(blocked)))
248                 goto badframe;
249 
250         set_current_blocked(&blocked);
251 
252         if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
253                 goto badframe;
254 
255         /* Restore the user's stack as well */
256         pt_psp(regs) = regs->r29;
257 
258         regs->syscall_nr = -1;
259 
260         if (restore_altstack(&frame->uc.uc_stack))
261                 goto badframe;
262 
263         return regs->r00;
264 
265 badframe:
266         force_sig(SIGSEGV, current);
267         return 0;
268 }
269 

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