1 /*- 2 * Copyright (c) 1994-1995 S�ren Schmidt 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software withough specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $Id: linux_signal.c,v 1.13 1998/10/11 04:54:16 jdp Exp $ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/sysproto.h> 34 #include <sys/proc.h> 35 #include <sys/signalvar.h> 36 37 #include <i386/linux/linux.h> 38 #include <i386/linux/linux_proto.h> 39 #include <i386/linux/linux_util.h> 40 41 static sigset_t 42 linux_to_bsd_sigset(linux_sigset_t mask) { 43 int b, l; 44 sigset_t new = 0; 45 46 for (l = 1; l < LINUX_NSIG; l++) { 47 if (mask & (1 << (l - 1))) { 48 if ((b = linux_to_bsd_signal[l])) 49 new |= (1 << (b - 1)); 50 } 51 } 52 return new; 53 } 54 55 static linux_sigset_t 56 bsd_to_linux_sigset(sigset_t mask) { 57 int b, l; 58 sigset_t new = 0; 59 60 for (b = 1; b < NSIG; b++) { 61 if (mask & (1 << (b - 1))) { 62 if ((l = bsd_to_linux_signal[b])) 63 new |= (1 << (l - 1)); 64 } 65 } 66 return new; 67 } 68 69 static void 70 linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa) 71 { 72 bsa->sa_mask = linux_to_bsd_sigset(lsa->sa_mask); 73 bsa->sa_handler = lsa->sa_handler; 74 bsa->sa_flags = 0; 75 if (lsa->sa_flags & LINUX_SA_NOCLDSTOP) 76 bsa->sa_flags |= SA_NOCLDSTOP; 77 if (lsa->sa_flags & LINUX_SA_ONSTACK) 78 bsa->sa_flags |= SA_ONSTACK; 79 if (lsa->sa_flags & LINUX_SA_RESTART) 80 bsa->sa_flags |= SA_RESTART; 81 if (lsa->sa_flags & LINUX_SA_ONESHOT) 82 bsa->sa_flags |= SA_RESETHAND; 83 if (lsa->sa_flags & LINUX_SA_NOMASK) 84 bsa->sa_flags |= SA_NODEFER; 85 } 86 87 static void 88 bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa) 89 { 90 lsa->sa_handler = bsa->sa_handler; 91 lsa->sa_restorer = NULL; /* unsupported */ 92 lsa->sa_mask = bsd_to_linux_sigset(bsa->sa_mask); 93 lsa->sa_flags = 0; 94 if (bsa->sa_flags & SA_NOCLDSTOP) 95 lsa->sa_flags |= LINUX_SA_NOCLDSTOP; 96 if (bsa->sa_flags & SA_ONSTACK) 97 lsa->sa_flags |= LINUX_SA_ONSTACK; 98 if (bsa->sa_flags & SA_RESTART) 99 lsa->sa_flags |= LINUX_SA_RESTART; 100 if (bsa->sa_flags & SA_RESETHAND) 101 lsa->sa_flags |= LINUX_SA_ONESHOT; 102 if (bsa->sa_flags & SA_NODEFER) 103 lsa->sa_flags |= LINUX_SA_NOMASK; 104 } 105 106 int 107 linux_sigaction(struct proc *p, struct linux_sigaction_args *args) 108 { 109 linux_sigaction_t linux_sa; 110 struct sigaction *nsa = NULL, *osa = NULL, bsd_sa; 111 struct sigaction_args sa; 112 int error; 113 caddr_t sg = stackgap_init(); 114 115 #ifdef DEBUG 116 printf("Linux-emul(%ld): sigaction(%d, %p, %p)\n", 117 (long)p->p_pid, args->sig, (void *)args->nsa, (void *)args->osa); 118 #endif 119 if (args->sig <= 0 || args->sig >= LINUX_NSIG) 120 return EINVAL; 121 if (args->osa) 122 osa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction)); 123 124 if (args->nsa) { 125 nsa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction)); 126 if (error = copyin(args->nsa, &linux_sa, sizeof(linux_sigaction_t))) 127 return error; 128 linux_to_bsd_sigaction(&linux_sa, &bsd_sa); 129 if (error = copyout(&bsd_sa, nsa, sizeof(struct sigaction))) 130 return error; 131 } 132 sa.signum = linux_to_bsd_signal[args->sig]; 133 sa.nsa = nsa; 134 sa.osa = osa; 135 if ((error = sigaction(p, &sa))) 136 return error; 137 138 if (args->osa) { 139 if (error = copyin(osa, &bsd_sa, sizeof(struct sigaction))) 140 return error; 141 bsd_to_linux_sigaction(&bsd_sa, &linux_sa); 142 if (error = copyout(&linux_sa, args->osa, sizeof(linux_sigaction_t))) 143 return error; 144 } 145 return 0; 146 } 147 148 int 149 linux_signal(struct proc *p, struct linux_signal_args *args) 150 { 151 caddr_t sg; 152 struct sigaction_args sa_args; 153 struct sigaction *osa, *nsa, tmpsa; 154 int error; 155 156 #ifdef DEBUG 157 printf("Linux-emul(%ld): signal(%d, %p)\n", 158 (long)p->p_pid, args->sig, (void *)args->handler); 159 #endif 160 if (args->sig <= 0 || args->sig >= LINUX_NSIG) 161 return EINVAL; 162 sg = stackgap_init(); 163 nsa = stackgap_alloc(&sg, sizeof *nsa); 164 osa = stackgap_alloc(&sg, sizeof *osa); 165 166 tmpsa.sa_handler = args->handler; 167 tmpsa.sa_mask = (sigset_t) 0; 168 tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER; 169 if ((error = copyout(&tmpsa, nsa, sizeof tmpsa))) 170 return error; 171 172 sa_args.signum = linux_to_bsd_signal[args->sig]; 173 sa_args.osa = osa; 174 sa_args.nsa = nsa; 175 if ((error = sigaction(p, &sa_args))) 176 return error; 177 178 if ((error = copyin(osa, &tmpsa, sizeof *osa))) 179 return error; 180 181 p->p_retval[0] = (int)tmpsa.sa_handler; 182 183 return 0; 184 } 185 186 187 int 188 linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args) 189 { 190 int error, s; 191 sigset_t mask; 192 sigset_t omask; 193 194 #ifdef DEBUG 195 printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how); 196 #endif 197 198 p->p_retval[0] = 0; 199 200 if (args->omask != NULL) { 201 omask = bsd_to_linux_sigset(p->p_sigmask); 202 if (error = copyout(&omask, args->omask, sizeof(sigset_t))) 203 return error; 204 } 205 if (!(args->mask)) 206 return 0; 207 if (error = copyin(args->mask, &mask, sizeof(linux_sigset_t))) 208 return error; 209 210 mask = linux_to_bsd_sigset(mask); 211 s = splhigh(); 212 switch (args->how) { 213 case LINUX_SIG_BLOCK: 214 p->p_sigmask |= (mask & ~sigcantmask); 215 break; 216 case LINUX_SIG_UNBLOCK: 217 p->p_sigmask &= ~mask; 218 break; 219 case LINUX_SIG_SETMASK: 220 p->p_sigmask = (mask & ~sigcantmask); 221 break; 222 default: 223 error = EINVAL; 224 break; 225 } 226 splx(s); 227 return error; 228 } 229 230 int 231 linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args) 232 { 233 #ifdef DEBUG 234 printf("Linux-emul(%d): siggetmask()\n", p->p_pid); 235 #endif 236 p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask); 237 return 0; 238 } 239 240 int 241 linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args) 242 { 243 int s; 244 sigset_t mask; 245 246 #ifdef DEBUG 247 printf("Linux-emul(%ld): sigsetmask(%08lx)\n", 248 (long)p->p_pid, (unsigned long)args->mask); 249 #endif 250 p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask); 251 252 mask = linux_to_bsd_sigset(args->mask); 253 s = splhigh(); 254 p->p_sigmask = mask & ~sigcantmask; 255 splx(s); 256 return 0; 257 } 258 259 int 260 linux_sigpending(struct proc *p, struct linux_sigpending_args *args) 261 { 262 linux_sigset_t linux_sig; 263 264 #ifdef DEBUG 265 printf("Linux-emul(%d): sigpending(*)\n", p->p_pid); 266 #endif 267 linux_sig = bsd_to_linux_sigset(p->p_siglist & p->p_sigmask); 268 return copyout(&linux_sig, args->mask, sizeof(linux_sig)); 269 } 270 271 /* 272 * Linux has two extra args, restart and oldmask. We dont use these, 273 * but it seems that "restart" is actually a context pointer that 274 * enables the signal to happen with a different register set. 275 */ 276 int 277 linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args) 278 { 279 struct sigsuspend_args tmp; 280 281 #ifdef DEBUG 282 printf("Linux-emul(%ld): sigsuspend(%08lx)\n", 283 (long)p->p_pid, (unsigned long)args->mask); 284 #endif 285 tmp.mask = linux_to_bsd_sigset(args->mask); 286 return sigsuspend(p, &tmp); 287 } 288 289 int 290 linux_pause(struct proc *p, struct linux_pause_args *args) 291 { 292 struct sigsuspend_args tmp; 293 294 #ifdef DEBUG 295 printf("Linux-emul(%d): pause()\n", p->p_pid); 296 #endif 297 tmp.mask = p->p_sigmask; 298 return sigsuspend(p, &tmp); 299 } 300 301 int 302 linux_kill(struct proc *p, struct linux_kill_args *args) 303 { 304 struct kill_args /* { 305 int pid; 306 int signum; 307 } */ tmp; 308 309 #ifdef DEBUG 310 printf("Linux-emul(%d): kill(%d, %d)\n", 311 p->p_pid, args->pid, args->signum); 312 #endif 313 if (args->signum < 0 || args->signum >= LINUX_NSIG) 314 return EINVAL; 315 tmp.pid = args->pid; 316 tmp.signum = linux_to_bsd_signal[args->signum]; 317 return kill(p, &tmp); 318 } 319