arch/parisc/kernel/signal32.c

   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/config.h>
  24 #include <linux/compat.h>
  25 #include <linux/slab.h>
  26 #include <linux/module.h>
  27 #include <linux/unistd.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/init.h>
  30 #include <linux/sched.h>
  31 #include <linux/syscalls.h>
  32 #include <linux/types.h>
  33 #include <linux/errno.h>
  34
  35 #include <asm/compat_signal.h>
  36 #include <asm/uaccess.h>
  37
  38 #include "signal32.h"
  39 #include "sys32.h"
  40
  41 #define DEBUG_COMPAT_SIG 0
  42 #define DEBUG_COMPAT_SIG_LEVEL 2
  43
  44 #if DEBUG_COMPAT_SIG
  45 #define DBG(LEVEL, ...) \
  46         ((DEBUG_COMPAT_SIG_LEVEL >= LEVEL) \
  47         ? printk(__VA_ARGS__) : (void) 0)
  48 #else
  49 #define DBG(LEVEL, ...)
  50 #endif
  51
  52 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  53
  54 inline void
  55 sigset_32to64(sigset_t *s64, compat_sigset_t *s32)
  56 {
  57         s64->sig[0] = s32->sig[0] | ((unsigned long)s32->sig[1] << 32);
  58 }
  59
  60 inline void
  61 sigset_64to32(compat_sigset_t *s32, sigset_t *s64)
  62 {
  63         s32->sig[0] = s64->sig[0] & 0xffffffffUL;
  64         s32->sig[1] = (s64->sig[0] >> 32) & 0xffffffffUL;
  65 }
  66
  67 static int
  68 put_sigset32(compat_sigset_t *up, sigset_t *set, size_t sz)
  69 {
  70         compat_sigset_t s;
  71
  72         if (sz != sizeof *set) panic("put_sigset32()");
  73         sigset_64to32(&s, set);
  74
  75         return copy_to_user(up, &s, sizeof s);
  76 }
  77
  78 static int
  79 get_sigset32(compat_sigset_t *up, sigset_t *set, size_t sz)
  80 {
  81         compat_sigset_t s;
  82         int r;
  83
  84         if (sz != sizeof *set) panic("put_sigset32()");
  85
  86         if ((r = copy_from_user(&s, up, sz)) == 0) {
  87                 sigset_32to64(set, &s);
  88         }
  89
  90         return r;
  91 }
  92
  93 int sys32_rt_sigprocmask(int how, compat_sigset_t *set, compat_sigset_t *oset,
  94                                     unsigned int sigsetsize)
  95 {
  96         sigset_t old_set, new_set;
  97         int ret;
  98
  99         if (set && get_sigset32(set, &new_set, sigsetsize))
 100                 return -EFAULT;
 101
 102         KERNEL_SYSCALL(ret, sys_rt_sigprocmask, how, set ? &new_set : NULL,
 103                                  oset ? &old_set : NULL, sigsetsize);
 104
 105         if (!ret && oset && put_sigset32(oset, &old_set, sigsetsize))
 106                 return -EFAULT;
 107
 108         return ret;
 109 }
 110
 111
 112 int sys32_rt_sigpending(compat_sigset_t *uset, unsigned int sigsetsize)
 113 {
 114         int ret;
 115         sigset_t set;
 116
 117         KERNEL_SYSCALL(ret, sys_rt_sigpending, &set, sigsetsize);
 118
 119         if (!ret && put_sigset32(uset, &set, sigsetsize))
 120                 return -EFAULT;
 121
 122         return ret;
 123 }
 124
 125 long
 126 sys32_rt_sigaction(int sig, const struct sigaction32 *act, struct sigaction32 *oact,
 127                  size_t sigsetsize)
 128 {
 129         struct k_sigaction32 new_sa32, old_sa32;
 130         struct k_sigaction new_sa, old_sa;
 131         int ret = -EINVAL;
 132
 133         if (act) {
 134                 if (copy_from_user(&new_sa32.sa, act, sizeof new_sa32.sa))
 135                         return -EFAULT;
 136                 new_sa.sa.sa_handler = (__sighandler_t)(unsigned long)new_sa32.sa.sa_handler;
 137                 new_sa.sa.sa_flags = new_sa32.sa.sa_flags;
 138                 sigset_32to64(&new_sa.sa.sa_mask, &new_sa32.sa.sa_mask);
 139         }
 140
 141         ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
 142
 143         if (!ret && oact) {
 144                 sigset_64to32(&old_sa32.sa.sa_mask, &old_sa.sa.sa_mask);
 145                 old_sa32.sa.sa_flags = old_sa.sa.sa_flags;
 146                 old_sa32.sa.sa_handler = (__sighandler_t32)(unsigned long)old_sa.sa.sa_handler;
 147                 if (copy_to_user(oact, &old_sa32.sa, sizeof old_sa32.sa))
 148                         return -EFAULT;
 149         }
 150         return ret;
 151 }
 152
 153 int
 154 do_sigaltstack32 (const compat_stack_t *uss32, compat_stack_t *uoss32, unsigned long sp)
 155 {
 156         compat_stack_t ss32, oss32;
 157         stack_t ss, oss;
 158         stack_t *ssp = NULL, *ossp = NULL;
 159         int ret;
 160
 161         if (uss32) {
 162                 if (copy_from_user(&ss32, uss32, sizeof ss32))
 163                         return -EFAULT;
 164
 165                 ss.ss_sp = (void *)(unsigned long)ss32.ss_sp;
 166                 ss.ss_flags = ss32.ss_flags;
 167                 ss.ss_size = ss32.ss_size;
 168
 169                 ssp = &ss;
 170         }
 171
 172         if (uoss32)
 173                 ossp = &oss;
 174
 175         KERNEL_SYSCALL(ret, do_sigaltstack, ssp, ossp, sp);
 176
 177         if (!ret && uoss32) {
 178                 oss32.ss_sp = (unsigned int)(unsigned long)oss.ss_sp;
 179                 oss32.ss_flags = oss.ss_flags;
 180                 oss32.ss_size = oss.ss_size;
 181                 if (copy_to_user(uoss32, &oss32, sizeof *uoss32))
 182                         return -EFAULT;
 183         }
 184
 185         return ret;
 186 }
 187
 188 long
 189 restore_sigcontext32(struct compat_sigcontext *sc, struct compat_regfile * rf,
 190                 struct pt_regs *regs)
 191 {
 192         long err = 0;
 193         compat_uint_t compat_reg;
 194         compat_uint_t compat_regt;
 195         int regn;
 196
 197         /* When loading 32-bit values into 64-bit registers make
 198            sure to clear the upper 32-bits */
 199         DBG(2,"restore_sigcontext32: PER_LINUX32 process\n");
 200         DBG(2,"restore_sigcontext32: sc = 0x%p, rf = 0x%p, regs = 0x%p\n", sc, rf, regs);
 201         DBG(2,"restore_sigcontext32: compat_sigcontext is %#lx bytes\n", sizeof(*sc));
 202         for(regn=0; regn < 32; regn++){
 203                 err |= __get_user(compat_reg,&sc->sc_gr[regn]);
 204                 regs->gr[regn] = compat_reg;
 205                 /* Load upper half */
 206                 err |= __get_user(compat_regt,&rf->rf_gr[regn]);
 207                 regs->gr[regn] = ((u64)compat_regt << 32) | (u64)compat_reg;
 208                 DBG(3,"restore_sigcontext32: gr%02d = %#lx (%#x / %#x)\n",
 209                                 regn, regs->gr[regn], compat_regt, compat_reg);
 210         }
 211         DBG(2,"restore_sigcontext32: sc->sc_fr = 0x%p (%#lx)\n",sc->sc_fr, sizeof(sc->sc_fr));
 212         /* XXX: BE WARNED FR's are 64-BIT! */
 213         err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
 214
 215         /* Better safe than sorry, pass __get_user two things of
 216            the same size and let gcc do the upward conversion to
 217            64-bits */
 218         err |= __get_user(compat_reg, &sc->sc_iaoq[0]);
 219         /* Load upper half */
 220         err |= __get_user(compat_regt, &rf->rf_iaoq[0]);
 221         regs->iaoq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
 222         DBG(2,"restore_sigcontext32: upper half of iaoq[0] = %#lx\n", compat_regt);
 223         DBG(2,"restore_sigcontext32: sc->sc_iaoq[0] = %p => %#x\n",
 224                         &sc->sc_iaoq[0], compat_reg);
 225
 226         err |= __get_user(compat_reg, &sc->sc_iaoq[1]);
 227         /* Load upper half */
 228         err |= __get_user(compat_regt, &rf->rf_iaoq[1]);
 229         regs->iaoq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
 230         DBG(2,"restore_sigcontext32: upper half of iaoq[1] = %#lx\n", compat_regt);
 231         DBG(2,"restore_sigcontext32: sc->sc_iaoq[1] = %p => %#x\n",
 232                         &sc->sc_iaoq[1],compat_reg);
 233         DBG(2,"restore_sigcontext32: iaoq is %#lx / %#lx\n",
 234                         regs->iaoq[0],regs->iaoq[1]);
 235
 236         err |= __get_user(compat_reg, &sc->sc_iasq[0]);
 237         /* Load the upper half for iasq */
 238         err |= __get_user(compat_regt, &rf->rf_iasq[0]);
 239         regs->iasq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
 240         DBG(2,"restore_sigcontext32: upper half of iasq[0] = %#lx\n", compat_regt);
 241
 242         err |= __get_user(compat_reg, &sc->sc_iasq[1]);
 243         /* Load the upper half for iasq */
 244         err |= __get_user(compat_regt, &rf->rf_iasq[1]);
 245         regs->iasq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
 246         DBG(2,"restore_sigcontext32: upper half of iasq[1] = %#lx\n", compat_regt);
 247         DBG(2,"restore_sigcontext32: iasq is %#lx / %#lx\n",
 248                 regs->iasq[0],regs->iasq[1]);
 249
 250         err |= __get_user(compat_reg, &sc->sc_sar);
 251         /* Load the upper half for sar */
 252         err |= __get_user(compat_regt, &rf->rf_sar);
 253         regs->sar = ((u64)compat_regt << 32) | (u64)compat_reg;
 254         DBG(2,"restore_sigcontext32: upper_half & sar = %#lx\n", compat_regt);
 255         DBG(2,"restore_sigcontext32: sar is %#lx\n", regs->sar);
 256         DBG(2,"restore_sigcontext32: r28 is %ld\n", regs->gr[28]);
 257
 258         return err;
 259 }
 260
 261 /*
 262  * Set up the sigcontext structure for this process.
 263  * This is not an easy task if the kernel is 64-bit, it will require
 264  * that we examine the process personality to determine if we need to
 265  * truncate for a 32-bit userspace.
 266  */
 267 long
 268 setup_sigcontext32(struct compat_sigcontext *sc, struct compat_regfile * rf,
 269                 struct pt_regs *regs, int in_syscall)
 270 {
 271         compat_int_t flags = 0;
 272         long err = 0;
 273         compat_uint_t compat_reg;
 274         compat_uint_t compat_regb;
 275         int regn;
 276
 277         if (on_sig_stack((unsigned long) sc))
 278                 flags |= PARISC_SC_FLAG_ONSTACK;
 279
 280         if (in_syscall) {
 281
 282                 DBG(1,"setup_sigcontext32: in_syscall\n");
 283
 284                 flags |= PARISC_SC_FLAG_IN_SYSCALL;
 285                 /* Truncate gr31 */
 286                 compat_reg = (compat_uint_t)(regs->gr[31]);
 287                 /* regs->iaoq is undefined in the syscall return path */
 288                 err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
 289                 DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
 290                                 &sc->sc_iaoq[0], compat_reg);
 291
 292                 /* Store upper half */
 293                 compat_reg = (compat_uint_t)(regs->gr[32] >> 32);
 294                 err |= __put_user(compat_reg, &rf->rf_iaoq[0]);
 295                 DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
 296
 297
 298                 compat_reg = (compat_uint_t)(regs->gr[31]+4);
 299                 err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
 300                 DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
 301                                 &sc->sc_iaoq[1], compat_reg);
 302                 /* Store upper half */
 303                 compat_reg = (compat_uint_t)((regs->gr[32]+4) >> 32);
 304                 err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
 305                 DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
 306
 307                 /* Truncate sr3 */
 308                 compat_reg = (compat_uint_t)(regs->sr[3]);
 309                 err |= __put_user(compat_reg, &sc->sc_iasq[0]);
 310                 err |= __put_user(compat_reg, &sc->sc_iasq[1]);
 311
 312                 /* Store upper half */
 313                 compat_reg = (compat_uint_t)(regs->sr[3] >> 32);
 314                 err |= __put_user(compat_reg, &rf->rf_iasq[0]);
 315                 err |= __put_user(compat_reg, &rf->rf_iasq[1]);
 316
 317                 DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
 318                 DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);
 319                 DBG(1,"setup_sigcontext32: iaoq %#lx / %#lx\n",
 320                         regs->gr[31], regs->gr[31]+4);
 321
 322         } else {
 323
 324                 compat_reg = (compat_uint_t)(regs->iaoq[0]);
 325                 err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
 326                 DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
 327                                 &sc->sc_iaoq[0], compat_reg);
 328                 /* Store upper half */
 329                 compat_reg = (compat_uint_t)(regs->iaoq[0] >> 32);
 330                 err |= __put_user(compat_reg, &rf->rf_iaoq[0]);
 331                 DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
 332
 333                 compat_reg = (compat_uint_t)(regs->iaoq[1]);
 334                 err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
 335                 DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
 336                                 &sc->sc_iaoq[1], compat_reg);
 337                 /* Store upper half */
 338                 compat_reg = (compat_uint_t)(regs->iaoq[1] >> 32);
 339                 err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
 340                 DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
 341
 342
 343                 compat_reg = (compat_uint_t)(regs->iasq[0]);
 344                 err |= __put_user(compat_reg, &sc->sc_iasq[0]);
 345                 DBG(2,"setup_sigcontext32: sc->sc_iasq[0] = %p <= %#x\n",
 346                                 &sc->sc_iasq[0], compat_reg);
 347                 /* Store upper half */
 348                 compat_reg = (compat_uint_t)(regs->iasq[0] >> 32);
 349                 err |= __put_user(compat_reg, &rf->rf_iasq[0]);
 350                 DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
 351
 352
 353                 compat_reg = (compat_uint_t)(regs->iasq[1]);
 354                 err |= __put_user(compat_reg, &sc->sc_iasq[1]);
 355                 DBG(2,"setup_sigcontext32: sc->sc_iasq[1] = %p <= %#x\n",
 356                                 &sc->sc_iasq[1], compat_reg);
 357                 /* Store upper half */
 358                 compat_reg = (compat_uint_t)(regs->iasq[1] >> 32);
 359                 err |= __put_user(compat_reg, &rf->rf_iasq[1]);
 360                 DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);
 361
 362                 /* Print out the IAOQ for debugging */
 363                 DBG(1,"setup_sigcontext32: ia0q %#lx / %#lx\n",
 364                         regs->iaoq[0], regs->iaoq[1]);
 365         }
 366
 367         err |= __put_user(flags, &sc->sc_flags);
 368
 369         DBG(1,"setup_sigcontext32: Truncating general registers.\n");
 370
 371         for(regn=0; regn < 32; regn++){
 372                 /* Truncate a general register */
 373                 compat_reg = (compat_uint_t)(regs->gr[regn]);
 374                 err |= __put_user(compat_reg, &sc->sc_gr[regn]);
 375                 /* Store upper half */
 376                 compat_regb = (compat_uint_t)(regs->gr[regn] >> 32);
 377                 err |= __put_user(compat_regb, &rf->rf_gr[regn]);
 378
 379                 /* DEBUG: Write out the "upper / lower" register data */
 380                 DBG(2,"setup_sigcontext32: gr%02d = %#x / %#x\n", regn,
 381                                 compat_regb, compat_reg);
 382         }
 383
 384         /* Copy the floating point registers (same size)
 385            XXX: BE WARNED FR's are 64-BIT! */
 386         DBG(1,"setup_sigcontext32: Copying from regs to sc, "
 387               "sc->sc_fr size = %#lx, regs->fr size = %#lx\n",
 388                 sizeof(regs->fr), sizeof(sc->sc_fr));
 389         err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
 390
 391         compat_reg = (compat_uint_t)(regs->sar);
 392         err |= __put_user(compat_reg, &sc->sc_sar);
 393         DBG(2,"setup_sigcontext32: sar is %#x\n", compat_reg);
 394         /* Store upper half */
 395         compat_reg = (compat_uint_t)(regs->sar >> 32);
 396         err |= __put_user(compat_reg, &rf->rf_sar);
 397         DBG(2,"setup_sigcontext32: upper half sar = %#x\n", compat_reg);
 398         DBG(1,"setup_sigcontext32: r28 is %ld\n", regs->gr[28]);
 399
 400         return err;
 401 }