Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Signal support for 32-bit kernel builds |
| 2 | * |
| 3 | * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> |
| 4 | * Code was mostly borrowed from kernel/signal.c. |
| 5 | * See kernel/signal.c for additional Copyrights. |
| 6 | * |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | */ |
| 22 | |
| 23 | #include <linux/compat.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/unistd.h> |
| 27 | #include <linux/smp_lock.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/sched.h> |
| 30 | #include <linux/syscalls.h> |
| 31 | #include <linux/types.h> |
| 32 | #include <linux/errno.h> |
| 33 | |
| 34 | #include <asm/compat_signal.h> |
| 35 | #include <asm/uaccess.h> |
| 36 | |
| 37 | #include "signal32.h" |
| 38 | #include "sys32.h" |
| 39 | |
| 40 | #define DEBUG_COMPAT_SIG 0 |
| 41 | #define DEBUG_COMPAT_SIG_LEVEL 2 |
| 42 | |
| 43 | #if DEBUG_COMPAT_SIG |
| 44 | #define DBG(LEVEL, ...) \ |
| 45 | ((DEBUG_COMPAT_SIG_LEVEL >= LEVEL) \ |
| 46 | ? printk(__VA_ARGS__) : (void) 0) |
| 47 | #else |
| 48 | #define DBG(LEVEL, ...) |
| 49 | #endif |
| 50 | |
| 51 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 52 | |
| 53 | inline void |
| 54 | sigset_32to64(sigset_t *s64, compat_sigset_t *s32) |
| 55 | { |
| 56 | s64->sig[0] = s32->sig[0] | ((unsigned long)s32->sig[1] << 32); |
| 57 | } |
| 58 | |
| 59 | inline void |
| 60 | sigset_64to32(compat_sigset_t *s32, sigset_t *s64) |
| 61 | { |
| 62 | s32->sig[0] = s64->sig[0] & 0xffffffffUL; |
| 63 | s32->sig[1] = (s64->sig[0] >> 32) & 0xffffffffUL; |
| 64 | } |
| 65 | |
| 66 | static int |
| 67 | put_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz) |
| 68 | { |
| 69 | compat_sigset_t s; |
| 70 | |
| 71 | if (sz != sizeof *set) panic("put_sigset32()"); |
| 72 | sigset_64to32(&s, set); |
| 73 | |
| 74 | return copy_to_user(up, &s, sizeof s); |
| 75 | } |
| 76 | |
| 77 | static int |
| 78 | get_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz) |
| 79 | { |
| 80 | compat_sigset_t s; |
| 81 | int r; |
| 82 | |
| 83 | if (sz != sizeof *set) panic("put_sigset32()"); |
| 84 | |
| 85 | if ((r = copy_from_user(&s, up, sz)) == 0) { |
| 86 | sigset_32to64(set, &s); |
| 87 | } |
| 88 | |
| 89 | return r; |
| 90 | } |
| 91 | |
| 92 | int sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, compat_sigset_t __user *oset, |
| 93 | unsigned int sigsetsize) |
| 94 | { |
| 95 | sigset_t old_set, new_set; |
| 96 | int ret; |
| 97 | |
| 98 | if (set && get_sigset32(set, &new_set, sigsetsize)) |
| 99 | return -EFAULT; |
| 100 | |
| 101 | KERNEL_SYSCALL(ret, sys_rt_sigprocmask, how, set ? (sigset_t __user *)&new_set : NULL, |
| 102 | oset ? (sigset_t __user *)&old_set : NULL, sigsetsize); |
| 103 | |
| 104 | if (!ret && oset && put_sigset32(oset, &old_set, sigsetsize)) |
| 105 | return -EFAULT; |
| 106 | |
| 107 | return ret; |
| 108 | } |
| 109 | |
| 110 | |
| 111 | int sys32_rt_sigpending(compat_sigset_t __user *uset, unsigned int sigsetsize) |
| 112 | { |
| 113 | int ret; |
| 114 | sigset_t set; |
| 115 | |
| 116 | KERNEL_SYSCALL(ret, sys_rt_sigpending, (sigset_t __user *)&set, sigsetsize); |
| 117 | |
| 118 | if (!ret && put_sigset32(uset, &set, sigsetsize)) |
| 119 | return -EFAULT; |
| 120 | |
| 121 | return ret; |
| 122 | } |
| 123 | |
| 124 | long |
| 125 | sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, struct sigaction32 __user *oact, |
| 126 | size_t sigsetsize) |
| 127 | { |
| 128 | struct k_sigaction32 new_sa32, old_sa32; |
| 129 | struct k_sigaction new_sa, old_sa; |
| 130 | int ret = -EINVAL; |
| 131 | |
| 132 | if (act) { |
| 133 | if (copy_from_user(&new_sa32.sa, act, sizeof new_sa32.sa)) |
| 134 | return -EFAULT; |
| 135 | new_sa.sa.sa_handler = (__sighandler_t)(unsigned long)new_sa32.sa.sa_handler; |
| 136 | new_sa.sa.sa_flags = new_sa32.sa.sa_flags; |
| 137 | sigset_32to64(&new_sa.sa.sa_mask, &new_sa32.sa.sa_mask); |
| 138 | } |
| 139 | |
| 140 | ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL); |
| 141 | |
| 142 | if (!ret && oact) { |
| 143 | sigset_64to32(&old_sa32.sa.sa_mask, &old_sa.sa.sa_mask); |
| 144 | old_sa32.sa.sa_flags = old_sa.sa.sa_flags; |
| 145 | old_sa32.sa.sa_handler = (__sighandler_t32)(unsigned long)old_sa.sa.sa_handler; |
| 146 | if (copy_to_user(oact, &old_sa32.sa, sizeof old_sa32.sa)) |
| 147 | return -EFAULT; |
| 148 | } |
| 149 | return ret; |
| 150 | } |
| 151 | |
| 152 | int |
| 153 | do_sigaltstack32 (const compat_stack_t __user *uss32, compat_stack_t __user *uoss32, unsigned long sp) |
| 154 | { |
| 155 | compat_stack_t ss32, oss32; |
| 156 | stack_t ss, oss; |
| 157 | stack_t *ssp = NULL, *ossp = NULL; |
| 158 | int ret; |
| 159 | |
| 160 | if (uss32) { |
| 161 | if (copy_from_user(&ss32, uss32, sizeof ss32)) |
| 162 | return -EFAULT; |
| 163 | |
| 164 | ss.ss_sp = (void __user *)(unsigned long)ss32.ss_sp; |
| 165 | ss.ss_flags = ss32.ss_flags; |
| 166 | ss.ss_size = ss32.ss_size; |
| 167 | |
| 168 | ssp = &ss; |
| 169 | } |
| 170 | |
| 171 | if (uoss32) |
| 172 | ossp = &oss; |
| 173 | |
| 174 | KERNEL_SYSCALL(ret, do_sigaltstack, (const stack_t __user *)ssp, (stack_t __user *)ossp, sp); |
| 175 | |
| 176 | if (!ret && uoss32) { |
| 177 | oss32.ss_sp = (unsigned int)(unsigned long)oss.ss_sp; |
| 178 | oss32.ss_flags = oss.ss_flags; |
| 179 | oss32.ss_size = oss.ss_size; |
| 180 | if (copy_to_user(uoss32, &oss32, sizeof *uoss32)) |
| 181 | return -EFAULT; |
| 182 | } |
| 183 | |
| 184 | return ret; |
| 185 | } |
| 186 | |
| 187 | long |
| 188 | restore_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf, |
| 189 | struct pt_regs *regs) |
| 190 | { |
| 191 | long err = 0; |
| 192 | compat_uint_t compat_reg; |
| 193 | compat_uint_t compat_regt; |
| 194 | int regn; |
| 195 | |
| 196 | /* When loading 32-bit values into 64-bit registers make |
| 197 | sure to clear the upper 32-bits */ |
| 198 | DBG(2,"restore_sigcontext32: PER_LINUX32 process\n"); |
| 199 | DBG(2,"restore_sigcontext32: sc = 0x%p, rf = 0x%p, regs = 0x%p\n", sc, rf, regs); |
| 200 | DBG(2,"restore_sigcontext32: compat_sigcontext is %#lx bytes\n", sizeof(*sc)); |
| 201 | for(regn=0; regn < 32; regn++){ |
| 202 | err |= __get_user(compat_reg,&sc->sc_gr[regn]); |
| 203 | regs->gr[regn] = compat_reg; |
| 204 | /* Load upper half */ |
| 205 | err |= __get_user(compat_regt,&rf->rf_gr[regn]); |
| 206 | regs->gr[regn] = ((u64)compat_regt << 32) | (u64)compat_reg; |
| 207 | DBG(3,"restore_sigcontext32: gr%02d = %#lx (%#x / %#x)\n", |
| 208 | regn, regs->gr[regn], compat_regt, compat_reg); |
| 209 | } |
| 210 | DBG(2,"restore_sigcontext32: sc->sc_fr = 0x%p (%#lx)\n",sc->sc_fr, sizeof(sc->sc_fr)); |
| 211 | /* XXX: BE WARNED FR's are 64-BIT! */ |
| 212 | err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); |
| 213 | |
| 214 | /* Better safe than sorry, pass __get_user two things of |
| 215 | the same size and let gcc do the upward conversion to |
| 216 | 64-bits */ |
| 217 | err |= __get_user(compat_reg, &sc->sc_iaoq[0]); |
| 218 | /* Load upper half */ |
| 219 | err |= __get_user(compat_regt, &rf->rf_iaoq[0]); |
| 220 | regs->iaoq[0] = ((u64)compat_regt << 32) | (u64)compat_reg; |
| 221 | DBG(2,"restore_sigcontext32: upper half of iaoq[0] = %#lx\n", compat_regt); |
| 222 | DBG(2,"restore_sigcontext32: sc->sc_iaoq[0] = %p => %#x\n", |
| 223 | &sc->sc_iaoq[0], compat_reg); |
| 224 | |
| 225 | err |= __get_user(compat_reg, &sc->sc_iaoq[1]); |
| 226 | /* Load upper half */ |
| 227 | err |= __get_user(compat_regt, &rf->rf_iaoq[1]); |
| 228 | regs->iaoq[1] = ((u64)compat_regt << 32) | (u64)compat_reg; |
| 229 | DBG(2,"restore_sigcontext32: upper half of iaoq[1] = %#lx\n", compat_regt); |
| 230 | DBG(2,"restore_sigcontext32: sc->sc_iaoq[1] = %p => %#x\n", |
| 231 | &sc->sc_iaoq[1],compat_reg); |
| 232 | DBG(2,"restore_sigcontext32: iaoq is %#lx / %#lx\n", |
| 233 | regs->iaoq[0],regs->iaoq[1]); |
| 234 | |
| 235 | err |= __get_user(compat_reg, &sc->sc_iasq[0]); |
| 236 | /* Load the upper half for iasq */ |
| 237 | err |= __get_user(compat_regt, &rf->rf_iasq[0]); |
| 238 | regs->iasq[0] = ((u64)compat_regt << 32) | (u64)compat_reg; |
| 239 | DBG(2,"restore_sigcontext32: upper half of iasq[0] = %#lx\n", compat_regt); |
| 240 | |
| 241 | err |= __get_user(compat_reg, &sc->sc_iasq[1]); |
| 242 | /* Load the upper half for iasq */ |
| 243 | err |= __get_user(compat_regt, &rf->rf_iasq[1]); |
| 244 | regs->iasq[1] = ((u64)compat_regt << 32) | (u64)compat_reg; |
| 245 | DBG(2,"restore_sigcontext32: upper half of iasq[1] = %#lx\n", compat_regt); |
| 246 | DBG(2,"restore_sigcontext32: iasq is %#lx / %#lx\n", |
| 247 | regs->iasq[0],regs->iasq[1]); |
| 248 | |
| 249 | err |= __get_user(compat_reg, &sc->sc_sar); |
| 250 | /* Load the upper half for sar */ |
| 251 | err |= __get_user(compat_regt, &rf->rf_sar); |
| 252 | regs->sar = ((u64)compat_regt << 32) | (u64)compat_reg; |
| 253 | DBG(2,"restore_sigcontext32: upper_half & sar = %#lx\n", compat_regt); |
| 254 | DBG(2,"restore_sigcontext32: sar is %#lx\n", regs->sar); |
| 255 | DBG(2,"restore_sigcontext32: r28 is %ld\n", regs->gr[28]); |
| 256 | |
| 257 | return err; |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | * Set up the sigcontext structure for this process. |
| 262 | * This is not an easy task if the kernel is 64-bit, it will require |
| 263 | * that we examine the process personality to determine if we need to |
| 264 | * truncate for a 32-bit userspace. |
| 265 | */ |
| 266 | long |
| 267 | setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf, |
| 268 | struct pt_regs *regs, int in_syscall) |
| 269 | { |
| 270 | compat_int_t flags = 0; |
| 271 | long err = 0; |
| 272 | compat_uint_t compat_reg; |
| 273 | compat_uint_t compat_regb; |
| 274 | int regn; |
| 275 | |
| 276 | if (on_sig_stack((unsigned long) sc)) |
| 277 | flags |= PARISC_SC_FLAG_ONSTACK; |
| 278 | |
| 279 | if (in_syscall) { |
| 280 | |
| 281 | DBG(1,"setup_sigcontext32: in_syscall\n"); |
| 282 | |
| 283 | flags |= PARISC_SC_FLAG_IN_SYSCALL; |
| 284 | /* Truncate gr31 */ |
| 285 | compat_reg = (compat_uint_t)(regs->gr[31]); |
| 286 | /* regs->iaoq is undefined in the syscall return path */ |
| 287 | err |= __put_user(compat_reg, &sc->sc_iaoq[0]); |
| 288 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n", |
| 289 | &sc->sc_iaoq[0], compat_reg); |
| 290 | |
| 291 | /* Store upper half */ |
| 292 | compat_reg = (compat_uint_t)(regs->gr[32] >> 32); |
| 293 | err |= __put_user(compat_reg, &rf->rf_iaoq[0]); |
| 294 | DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg); |
| 295 | |
| 296 | |
| 297 | compat_reg = (compat_uint_t)(regs->gr[31]+4); |
| 298 | err |= __put_user(compat_reg, &sc->sc_iaoq[1]); |
| 299 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n", |
| 300 | &sc->sc_iaoq[1], compat_reg); |
| 301 | /* Store upper half */ |
| 302 | compat_reg = (compat_uint_t)((regs->gr[32]+4) >> 32); |
| 303 | err |= __put_user(compat_reg, &rf->rf_iaoq[1]); |
| 304 | DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg); |
| 305 | |
| 306 | /* Truncate sr3 */ |
| 307 | compat_reg = (compat_uint_t)(regs->sr[3]); |
| 308 | err |= __put_user(compat_reg, &sc->sc_iasq[0]); |
| 309 | err |= __put_user(compat_reg, &sc->sc_iasq[1]); |
| 310 | |
| 311 | /* Store upper half */ |
| 312 | compat_reg = (compat_uint_t)(regs->sr[3] >> 32); |
| 313 | err |= __put_user(compat_reg, &rf->rf_iasq[0]); |
| 314 | err |= __put_user(compat_reg, &rf->rf_iasq[1]); |
| 315 | |
| 316 | DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg); |
| 317 | DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg); |
| 318 | DBG(1,"setup_sigcontext32: iaoq %#lx / %#lx\n", |
| 319 | regs->gr[31], regs->gr[31]+4); |
| 320 | |
| 321 | } else { |
| 322 | |
| 323 | compat_reg = (compat_uint_t)(regs->iaoq[0]); |
| 324 | err |= __put_user(compat_reg, &sc->sc_iaoq[0]); |
| 325 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n", |
| 326 | &sc->sc_iaoq[0], compat_reg); |
| 327 | /* Store upper half */ |
| 328 | compat_reg = (compat_uint_t)(regs->iaoq[0] >> 32); |
| 329 | err |= __put_user(compat_reg, &rf->rf_iaoq[0]); |
| 330 | DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg); |
| 331 | |
| 332 | compat_reg = (compat_uint_t)(regs->iaoq[1]); |
| 333 | err |= __put_user(compat_reg, &sc->sc_iaoq[1]); |
| 334 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n", |
| 335 | &sc->sc_iaoq[1], compat_reg); |
| 336 | /* Store upper half */ |
| 337 | compat_reg = (compat_uint_t)(regs->iaoq[1] >> 32); |
| 338 | err |= __put_user(compat_reg, &rf->rf_iaoq[1]); |
| 339 | DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg); |
| 340 | |
| 341 | |
| 342 | compat_reg = (compat_uint_t)(regs->iasq[0]); |
| 343 | err |= __put_user(compat_reg, &sc->sc_iasq[0]); |
| 344 | DBG(2,"setup_sigcontext32: sc->sc_iasq[0] = %p <= %#x\n", |
| 345 | &sc->sc_iasq[0], compat_reg); |
| 346 | /* Store upper half */ |
| 347 | compat_reg = (compat_uint_t)(regs->iasq[0] >> 32); |
| 348 | err |= __put_user(compat_reg, &rf->rf_iasq[0]); |
| 349 | DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg); |
| 350 | |
| 351 | |
| 352 | compat_reg = (compat_uint_t)(regs->iasq[1]); |
| 353 | err |= __put_user(compat_reg, &sc->sc_iasq[1]); |
| 354 | DBG(2,"setup_sigcontext32: sc->sc_iasq[1] = %p <= %#x\n", |
| 355 | &sc->sc_iasq[1], compat_reg); |
| 356 | /* Store upper half */ |
| 357 | compat_reg = (compat_uint_t)(regs->iasq[1] >> 32); |
| 358 | err |= __put_user(compat_reg, &rf->rf_iasq[1]); |
| 359 | DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg); |
| 360 | |
| 361 | /* Print out the IAOQ for debugging */ |
| 362 | DBG(1,"setup_sigcontext32: ia0q %#lx / %#lx\n", |
| 363 | regs->iaoq[0], regs->iaoq[1]); |
| 364 | } |
| 365 | |
| 366 | err |= __put_user(flags, &sc->sc_flags); |
| 367 | |
| 368 | DBG(1,"setup_sigcontext32: Truncating general registers.\n"); |
| 369 | |
| 370 | for(regn=0; regn < 32; regn++){ |
| 371 | /* Truncate a general register */ |
| 372 | compat_reg = (compat_uint_t)(regs->gr[regn]); |
| 373 | err |= __put_user(compat_reg, &sc->sc_gr[regn]); |
| 374 | /* Store upper half */ |
| 375 | compat_regb = (compat_uint_t)(regs->gr[regn] >> 32); |
| 376 | err |= __put_user(compat_regb, &rf->rf_gr[regn]); |
| 377 | |
| 378 | /* DEBUG: Write out the "upper / lower" register data */ |
| 379 | DBG(2,"setup_sigcontext32: gr%02d = %#x / %#x\n", regn, |
| 380 | compat_regb, compat_reg); |
| 381 | } |
| 382 | |
| 383 | /* Copy the floating point registers (same size) |
| 384 | XXX: BE WARNED FR's are 64-BIT! */ |
| 385 | DBG(1,"setup_sigcontext32: Copying from regs to sc, " |
| 386 | "sc->sc_fr size = %#lx, regs->fr size = %#lx\n", |
| 387 | sizeof(regs->fr), sizeof(sc->sc_fr)); |
| 388 | err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); |
| 389 | |
| 390 | compat_reg = (compat_uint_t)(regs->sar); |
| 391 | err |= __put_user(compat_reg, &sc->sc_sar); |
| 392 | DBG(2,"setup_sigcontext32: sar is %#x\n", compat_reg); |
| 393 | /* Store upper half */ |
| 394 | compat_reg = (compat_uint_t)(regs->sar >> 32); |
| 395 | err |= __put_user(compat_reg, &rf->rf_sar); |
| 396 | DBG(2,"setup_sigcontext32: upper half sar = %#x\n", compat_reg); |
| 397 | DBG(1,"setup_sigcontext32: r28 is %ld\n", regs->gr[28]); |
| 398 | |
| 399 | return err; |
| 400 | } |