linux-user/m68k/signal.c

   1 /*
   2  *  Emulation of Linux signals
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   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 as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "qemu/osdep.h"
  20 #include "qemu.h"
  21 #include "signal-common.h"
  22 #include "linux-user/trace.h"
  23
  24 struct target_sigcontext {
  25     abi_ulong  sc_mask;
  26     abi_ulong  sc_usp;
  27     abi_ulong  sc_d0;
  28     abi_ulong  sc_d1;
  29     abi_ulong  sc_a0;
  30     abi_ulong  sc_a1;
  31     unsigned short sc_sr;
  32     abi_ulong  sc_pc;
  33 };
  34
  35 struct target_sigframe
  36 {
  37     abi_ulong pretcode;
  38     int sig;
  39     int code;
  40     abi_ulong psc;
  41     char retcode[8];
  42     abi_ulong extramask[TARGET_NSIG_WORDS-1];
  43     struct target_sigcontext sc;
  44 };
  45
  46 typedef int target_greg_t;
  47 #define TARGET_NGREG 18
  48 typedef target_greg_t target_gregset_t[TARGET_NGREG];
  49
  50 typedef struct target_fpregset {
  51     int f_fpcntl[3];
  52     int f_fpregs[8*3];
  53 } target_fpregset_t;
  54
  55 struct target_mcontext {
  56     int version;
  57     target_gregset_t gregs;
  58     target_fpregset_t fpregs;
  59 };
  60
  61 #define TARGET_MCONTEXT_VERSION 2
  62
  63 struct target_ucontext {
  64     abi_ulong tuc_flags;
  65     abi_ulong tuc_link;
  66     target_stack_t tuc_stack;
  67     struct target_mcontext tuc_mcontext;
  68     abi_long tuc_filler[80];
  69     target_sigset_t tuc_sigmask;
  70 };
  71
  72 struct target_rt_sigframe
  73 {
  74     abi_ulong pretcode;
  75     int sig;
  76     abi_ulong pinfo;
  77     abi_ulong puc;
  78     char retcode[8];
  79     struct target_siginfo info;
  80     struct target_ucontext uc;
  81 };
  82
  83 static void setup_sigcontext(struct target_sigcontext *sc, CPUM68KState *env,
  84                              abi_ulong mask)
  85 {
  86     uint32_t sr = (env->sr & 0xff00) | cpu_m68k_get_ccr(env);
  87     __put_user(mask, &sc->sc_mask);
  88     __put_user(env->aregs[7], &sc->sc_usp);
  89     __put_user(env->dregs[0], &sc->sc_d0);
  90     __put_user(env->dregs[1], &sc->sc_d1);
  91     __put_user(env->aregs[0], &sc->sc_a0);
  92     __put_user(env->aregs[1], &sc->sc_a1);
  93     __put_user(sr, &sc->sc_sr);
  94     __put_user(env->pc, &sc->sc_pc);
  95 }
  96
  97 static void
  98 restore_sigcontext(CPUM68KState *env, struct target_sigcontext *sc)
  99 {
 100     int temp;
 101
 102     __get_user(env->aregs[7], &sc->sc_usp);
 103     __get_user(env->dregs[0], &sc->sc_d0);
 104     __get_user(env->dregs[1], &sc->sc_d1);
 105     __get_user(env->aregs[0], &sc->sc_a0);
 106     __get_user(env->aregs[1], &sc->sc_a1);
 107     __get_user(env->pc, &sc->sc_pc);
 108     __get_user(temp, &sc->sc_sr);
 109     cpu_m68k_set_ccr(env, temp);
 110 }
 111
 112 /*
 113  * Determine which stack to use..
 114  */
 115 static inline abi_ulong
 116 get_sigframe(struct target_sigaction *ka, CPUM68KState *regs,
 117              size_t frame_size)
 118 {
 119     abi_ulong sp;
 120
 121     sp = target_sigsp(get_sp_from_cpustate(regs), ka);
 122
 123
 124     return ((sp - frame_size) & -8UL);
 125 }
 126
 127 void setup_frame(int sig, struct target_sigaction *ka,
 128                  target_sigset_t *set, CPUM68KState *env)
 129 {
 130     struct target_sigframe *frame;
 131     abi_ulong frame_addr;
 132     abi_ulong retcode_addr;
 133     abi_ulong sc_addr;
 134     int i;
 135
 136     frame_addr = get_sigframe(ka, env, sizeof *frame);
 137     trace_user_setup_frame(env, frame_addr);
 138     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 139         goto give_sigsegv;
 140     }
 141
 142     __put_user(sig, &frame->sig);
 143
 144     sc_addr = frame_addr + offsetof(struct target_sigframe, sc);
 145     __put_user(sc_addr, &frame->psc);
 146
 147     setup_sigcontext(&frame->sc, env, set->sig[0]);
 148
 149     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 150         __put_user(set->sig[i], &frame->extramask[i - 1]);
 151     }
 152
 153     /* Set up to return from userspace.  */
 154
 155     retcode_addr = frame_addr + offsetof(struct target_sigframe, retcode);
 156     __put_user(retcode_addr, &frame->pretcode);
 157
 158     /* moveq #,d0; trap #0 */
 159
 160     __put_user(0x70004e40 + (TARGET_NR_sigreturn << 16),
 161                (uint32_t *)(frame->retcode));
 162
 163     /* Set up to return from userspace */
 164
 165     env->aregs[7] = frame_addr;
 166     env->pc = ka->_sa_handler;
 167
 168     unlock_user_struct(frame, frame_addr, 1);
 169     return;
 170
 171 give_sigsegv:
 172     force_sigsegv(sig);
 173 }
 174
 175 static inline void target_rt_save_fpu_state(struct target_ucontext *uc,
 176                                            CPUM68KState *env)
 177 {
 178     int i;
 179     target_fpregset_t *fpregs = &uc->tuc_mcontext.fpregs;
 180
 181     __put_user(env->fpcr, &fpregs->f_fpcntl[0]);
 182     __put_user(env->fpsr, &fpregs->f_fpcntl[1]);
 183     /* fpiar is not emulated */
 184
 185     for (i = 0; i < 8; i++) {
 186         uint32_t high = env->fregs[i].d.high << 16;
 187         __put_user(high, &fpregs->f_fpregs[i * 3]);
 188         __put_user(env->fregs[i].d.low,
 189                    (uint64_t *)&fpregs->f_fpregs[i * 3 + 1]);
 190     }
 191 }
 192
 193 static inline int target_rt_setup_ucontext(struct target_ucontext *uc,
 194                                            CPUM68KState *env)
 195 {
 196     target_greg_t *gregs = uc->tuc_mcontext.gregs;
 197     uint32_t sr = (env->sr & 0xff00) | cpu_m68k_get_ccr(env);
 198
 199     __put_user(TARGET_MCONTEXT_VERSION, &uc->tuc_mcontext.version);
 200     __put_user(env->dregs[0], &gregs[0]);
 201     __put_user(env->dregs[1], &gregs[1]);
 202     __put_user(env->dregs[2], &gregs[2]);
 203     __put_user(env->dregs[3], &gregs[3]);
 204     __put_user(env->dregs[4], &gregs[4]);
 205     __put_user(env->dregs[5], &gregs[5]);
 206     __put_user(env->dregs[6], &gregs[6]);
 207     __put_user(env->dregs[7], &gregs[7]);
 208     __put_user(env->aregs[0], &gregs[8]);
 209     __put_user(env->aregs[1], &gregs[9]);
 210     __put_user(env->aregs[2], &gregs[10]);
 211     __put_user(env->aregs[3], &gregs[11]);
 212     __put_user(env->aregs[4], &gregs[12]);
 213     __put_user(env->aregs[5], &gregs[13]);
 214     __put_user(env->aregs[6], &gregs[14]);
 215     __put_user(env->aregs[7], &gregs[15]);
 216     __put_user(env->pc, &gregs[16]);
 217     __put_user(sr, &gregs[17]);
 218
 219     target_rt_save_fpu_state(uc, env);
 220
 221     return 0;
 222 }
 223
 224 static inline void target_rt_restore_fpu_state(CPUM68KState *env,
 225                                                struct target_ucontext *uc)
 226 {
 227     int i;
 228     target_fpregset_t *fpregs = &uc->tuc_mcontext.fpregs;
 229     uint32_t fpcr;
 230
 231     __get_user(fpcr, &fpregs->f_fpcntl[0]);
 232     cpu_m68k_set_fpcr(env, fpcr);
 233     __get_user(env->fpsr, &fpregs->f_fpcntl[1]);
 234     /* fpiar is not emulated */
 235
 236     for (i = 0; i < 8; i++) {
 237         uint32_t high;
 238         __get_user(high, &fpregs->f_fpregs[i * 3]);
 239         env->fregs[i].d.high = high >> 16;
 240         __get_user(env->fregs[i].d.low,
 241                    (uint64_t *)&fpregs->f_fpregs[i * 3 + 1]);
 242     }
 243 }
 244
 245 static inline int target_rt_restore_ucontext(CPUM68KState *env,
 246                                              struct target_ucontext *uc)
 247 {
 248     int temp;
 249     target_greg_t *gregs = uc->tuc_mcontext.gregs;
 250
 251     __get_user(temp, &uc->tuc_mcontext.version);
 252     if (temp != TARGET_MCONTEXT_VERSION)
 253         goto badframe;
 254
 255     /* restore passed registers */
 256     __get_user(env->dregs[0], &gregs[0]);
 257     __get_user(env->dregs[1], &gregs[1]);
 258     __get_user(env->dregs[2], &gregs[2]);
 259     __get_user(env->dregs[3], &gregs[3]);
 260     __get_user(env->dregs[4], &gregs[4]);
 261     __get_user(env->dregs[5], &gregs[5]);
 262     __get_user(env->dregs[6], &gregs[6]);
 263     __get_user(env->dregs[7], &gregs[7]);
 264     __get_user(env->aregs[0], &gregs[8]);
 265     __get_user(env->aregs[1], &gregs[9]);
 266     __get_user(env->aregs[2], &gregs[10]);
 267     __get_user(env->aregs[3], &gregs[11]);
 268     __get_user(env->aregs[4], &gregs[12]);
 269     __get_user(env->aregs[5], &gregs[13]);
 270     __get_user(env->aregs[6], &gregs[14]);
 271     __get_user(env->aregs[7], &gregs[15]);
 272     __get_user(env->pc, &gregs[16]);
 273     __get_user(temp, &gregs[17]);
 274     cpu_m68k_set_ccr(env, temp);
 275
 276     target_rt_restore_fpu_state(env, uc);
 277
 278     return 0;
 279
 280 badframe:
 281     return 1;
 282 }
 283
 284 void setup_rt_frame(int sig, struct target_sigaction *ka,
 285                     target_siginfo_t *info,
 286                     target_sigset_t *set, CPUM68KState *env)
 287 {
 288     struct target_rt_sigframe *frame;
 289     abi_ulong frame_addr;
 290     abi_ulong retcode_addr;
 291     abi_ulong info_addr;
 292     abi_ulong uc_addr;
 293     int err = 0;
 294     int i;
 295
 296     frame_addr = get_sigframe(ka, env, sizeof *frame);
 297     trace_user_setup_rt_frame(env, frame_addr);
 298     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 299         goto give_sigsegv;
 300     }
 301
 302     __put_user(sig, &frame->sig);
 303
 304     info_addr = frame_addr + offsetof(struct target_rt_sigframe, info);
 305     __put_user(info_addr, &frame->pinfo);
 306
 307     uc_addr = frame_addr + offsetof(struct target_rt_sigframe, uc);
 308     __put_user(uc_addr, &frame->puc);
 309
 310     tswap_siginfo(&frame->info, info);
 311
 312     /* Create the ucontext */
 313
 314     __put_user(0, &frame->uc.tuc_flags);
 315     __put_user(0, &frame->uc.tuc_link);
 316     target_save_altstack(&frame->uc.tuc_stack, env);
 317     err |= target_rt_setup_ucontext(&frame->uc, env);
 318
 319     if (err)
 320         goto give_sigsegv;
 321
 322     for(i = 0; i < TARGET_NSIG_WORDS; i++) {
 323         __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
 324     }
 325
 326     /* Set up to return from userspace.  */
 327
 328     retcode_addr = frame_addr + offsetof(struct target_sigframe, retcode);
 329     __put_user(retcode_addr, &frame->pretcode);
 330
 331     /* moveq #,d0; notb d0; trap #0 */
 332
 333     __put_user(0x70004600 + ((TARGET_NR_rt_sigreturn ^ 0xff) << 16),
 334                (uint32_t *)(frame->retcode + 0));
 335     __put_user(0x4e40, (uint16_t *)(frame->retcode + 4));
 336
 337     if (err)
 338         goto give_sigsegv;
 339
 340     /* Set up to return from userspace */
 341
 342     env->aregs[7] = frame_addr;
 343     env->pc = ka->_sa_handler;
 344
 345     unlock_user_struct(frame, frame_addr, 1);
 346     return;
 347
 348 give_sigsegv:
 349     unlock_user_struct(frame, frame_addr, 1);
 350     force_sigsegv(sig);
 351 }
 352
 353 long do_sigreturn(CPUM68KState *env)
 354 {
 355     struct target_sigframe *frame;
 356     abi_ulong frame_addr = env->aregs[7] - 4;
 357     target_sigset_t target_set;
 358     sigset_t set;
 359     int i;
 360
 361     trace_user_do_sigreturn(env, frame_addr);
 362     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1))
 363         goto badframe;
 364
 365     /* set blocked signals */
 366
 367     __get_user(target_set.sig[0], &frame->sc.sc_mask);
 368
 369     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 370         __get_user(target_set.sig[i], &frame->extramask[i - 1]);
 371     }
 372
 373     target_to_host_sigset_internal(&set, &target_set);
 374     set_sigmask(&set);
 375
 376     /* restore registers */
 377
 378     restore_sigcontext(env, &frame->sc);
 379
 380     unlock_user_struct(frame, frame_addr, 0);
 381     return -TARGET_QEMU_ESIGRETURN;
 382
 383 badframe:
 384     force_sig(TARGET_SIGSEGV);
 385     return -TARGET_QEMU_ESIGRETURN;
 386 }
 387
 388 long do_rt_sigreturn(CPUM68KState *env)
 389 {
 390     struct target_rt_sigframe *frame;
 391     abi_ulong frame_addr = env->aregs[7] - 4;
 392     sigset_t set;
 393
 394     trace_user_do_rt_sigreturn(env, frame_addr);
 395     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1))
 396         goto badframe;
 397
 398     target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
 399     set_sigmask(&set);
 400
 401     /* restore registers */
 402
 403     if (target_rt_restore_ucontext(env, &frame->uc))
 404         goto badframe;
 405
 406     if (do_sigaltstack(frame_addr +
 407                        offsetof(struct target_rt_sigframe, uc.tuc_stack),
 408                        0, get_sp_from_cpustate(env)) == -EFAULT)
 409         goto badframe;
 410
 411     unlock_user_struct(frame, frame_addr, 0);
 412     return -TARGET_QEMU_ESIGRETURN;
 413
 414 badframe:
 415     unlock_user_struct(frame, frame_addr, 0);
 416     force_sig(TARGET_SIGSEGV);
 417     return -TARGET_QEMU_ESIGRETURN;
 418 }