linux-user/sparc/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 "user-internals.h"
  22 #include "signal-common.h"
  23 #include "linux-user/trace.h"
  24
  25 /* A Sparc register window */
  26 struct target_reg_window {
  27     abi_ulong locals[8];
  28     abi_ulong ins[8];
  29 };
  30
  31 /* A Sparc stack frame. */
  32 struct target_stackf {
  33     /*
  34      * Since qemu does not reference fp or callers_pc directly,
  35      * it's simpler to treat fp and callers_pc as elements of ins[],
  36      * and then bundle locals[] and ins[] into reg_window.
  37      */
  38     struct target_reg_window win;
  39     /*
  40      * Similarly, bundle structptr and xxargs into xargs[].
  41      * This portion of the struct is part of the function call abi,
  42      * and belongs to the callee for spilling argument registers.
  43      */
  44     abi_ulong xargs[8];
  45 };
  46
  47 struct target_siginfo_fpu {
  48 #ifdef TARGET_SPARC64
  49     uint64_t si_double_regs[32];
  50     uint64_t si_fsr;
  51     uint64_t si_gsr;
  52     uint64_t si_fprs;
  53 #else
  54     /* It is more convenient for qemu to move doubles, not singles. */
  55     uint64_t si_double_regs[16];
  56     uint32_t si_fsr;
  57     uint32_t si_fpqdepth;
  58     struct {
  59         uint32_t insn_addr;
  60         uint32_t insn;
  61     } si_fpqueue [16];
  62 #endif
  63 };
  64
  65 #ifdef TARGET_ARCH_HAS_SETUP_FRAME
  66 struct target_signal_frame {
  67     struct target_stackf ss;
  68     struct target_pt_regs regs;
  69     uint32_t si_mask;
  70     abi_ulong fpu_save;
  71     uint32_t insns[2] QEMU_ALIGNED(8);
  72     abi_ulong extramask[TARGET_NSIG_WORDS - 1];
  73     abi_ulong extra_size; /* Should be 0 */
  74     abi_ulong rwin_save;
  75 };
  76 #endif
  77
  78 struct target_rt_signal_frame {
  79     struct target_stackf ss;
  80     target_siginfo_t info;
  81     struct target_pt_regs regs;
  82 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
  83     abi_ulong fpu_save;
  84     target_stack_t stack;
  85     target_sigset_t mask;
  86 #else
  87     target_sigset_t mask;
  88     abi_ulong fpu_save;
  89     uint32_t insns[2];
  90     target_stack_t stack;
  91     abi_ulong extra_size; /* Should be 0 */
  92 #endif
  93     abi_ulong rwin_save;
  94 };
  95
  96 static abi_ulong get_sigframe(struct target_sigaction *sa,
  97                               CPUSPARCState *env,
  98                               size_t framesize)
  99 {
 100     abi_ulong sp = get_sp_from_cpustate(env);
 101
 102     /*
 103      * If we are on the alternate signal stack and would overflow it, don't.
 104      * Return an always-bogus address instead so we will die with SIGSEGV.
 105      */
 106     if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) {
 107         return -1;
 108     }
 109
 110     /* This is the X/Open sanctioned signal stack switching.  */
 111     sp = target_sigsp(sp, sa) - framesize;
 112
 113     /*
 114      * Always align the stack frame.  This handles two cases.  First,
 115      * sigaltstack need not be mindful of platform specific stack
 116      * alignment.  Second, if we took this signal because the stack
 117      * is not aligned properly, we'd like to take the signal cleanly
 118      * and report that.
 119      */
 120     sp &= ~15UL;
 121
 122     return sp;
 123 }
 124
 125 static void save_pt_regs(struct target_pt_regs *regs, CPUSPARCState *env)
 126 {
 127     int i;
 128
 129 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
 130     __put_user(sparc64_tstate(env), &regs->tstate);
 131     /* TODO: magic should contain PT_REG_MAGIC + %tt. */
 132     __put_user(0, &regs->magic);
 133 #else
 134     __put_user(cpu_get_psr(env), &regs->psr);
 135 #endif
 136
 137     __put_user(env->pc, &regs->pc);
 138     __put_user(env->npc, &regs->npc);
 139     __put_user(env->y, &regs->y);
 140
 141     for (i = 0; i < 8; i++) {
 142         __put_user(env->gregs[i], &regs->u_regs[i]);
 143     }
 144     for (i = 0; i < 8; i++) {
 145         __put_user(env->regwptr[WREG_O0 + i], &regs->u_regs[i + 8]);
 146     }
 147 }
 148
 149 static void restore_pt_regs(struct target_pt_regs *regs, CPUSPARCState *env)
 150 {
 151     int i;
 152
 153 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
 154     /* User can only change condition codes and %asi in %tstate. */
 155     uint64_t tstate;
 156     __get_user(tstate, &regs->tstate);
 157     cpu_put_ccr(env, tstate >> 32);
 158     env->asi = extract64(tstate, 24, 8);
 159 #else
 160     /*
 161      * User can only change condition codes and FPU enabling in %psr.
 162      * But don't bother with FPU enabling, since a real kernel would
 163      * just re-enable the FPU upon the next fpu trap.
 164      */
 165     uint32_t psr;
 166     __get_user(psr, &regs->psr);
 167     env->psr = (psr & PSR_ICC) | (env->psr & ~PSR_ICC);
 168 #endif
 169
 170     /* Note that pc and npc are handled in the caller. */
 171
 172     __get_user(env->y, &regs->y);
 173
 174     for (i = 0; i < 8; i++) {
 175         __get_user(env->gregs[i], &regs->u_regs[i]);
 176     }
 177     for (i = 0; i < 8; i++) {
 178         __get_user(env->regwptr[WREG_O0 + i], &regs->u_regs[i + 8]);
 179     }
 180 }
 181
 182 static void save_reg_win(struct target_reg_window *win, CPUSPARCState *env)
 183 {
 184     int i;
 185
 186     for (i = 0; i < 8; i++) {
 187         __put_user(env->regwptr[i + WREG_L0], &win->locals[i]);
 188     }
 189     for (i = 0; i < 8; i++) {
 190         __put_user(env->regwptr[i + WREG_I0], &win->ins[i]);
 191     }
 192 }
 193
 194 static void save_fpu(struct target_siginfo_fpu *fpu, CPUSPARCState *env)
 195 {
 196     int i;
 197
 198 #ifdef TARGET_SPARC64
 199     for (i = 0; i < 32; ++i) {
 200         __put_user(env->fpr[i].ll, &fpu->si_double_regs[i]);
 201     }
 202     __put_user(env->fsr, &fpu->si_fsr);
 203     __put_user(env->gsr, &fpu->si_gsr);
 204     __put_user(env->fprs, &fpu->si_fprs);
 205 #else
 206     for (i = 0; i < 16; ++i) {
 207         __put_user(env->fpr[i].ll, &fpu->si_double_regs[i]);
 208     }
 209     __put_user(env->fsr, &fpu->si_fsr);
 210     __put_user(0, &fpu->si_fpqdepth);
 211 #endif
 212 }
 213
 214 static void restore_fpu(struct target_siginfo_fpu *fpu, CPUSPARCState *env)
 215 {
 216     int i;
 217
 218 #ifdef TARGET_SPARC64
 219     uint64_t fprs;
 220     __get_user(fprs, &fpu->si_fprs);
 221
 222     /* In case the user mucks about with FPRS, restore as directed. */
 223     if (fprs & FPRS_DL) {
 224         for (i = 0; i < 16; ++i) {
 225             __get_user(env->fpr[i].ll, &fpu->si_double_regs[i]);
 226         }
 227     }
 228     if (fprs & FPRS_DU) {
 229         for (i = 16; i < 32; ++i) {
 230             __get_user(env->fpr[i].ll, &fpu->si_double_regs[i]);
 231         }
 232     }
 233     __get_user(env->fsr, &fpu->si_fsr);
 234     __get_user(env->gsr, &fpu->si_gsr);
 235     env->fprs |= fprs;
 236 #else
 237     for (i = 0; i < 16; ++i) {
 238         __get_user(env->fpr[i].ll, &fpu->si_double_regs[i]);
 239     }
 240     __get_user(env->fsr, &fpu->si_fsr);
 241 #endif
 242 }
 243
 244 #ifdef TARGET_ARCH_HAS_SETUP_FRAME
 245 static void install_sigtramp(uint32_t *tramp, int syscall)
 246 {
 247     __put_user(0x82102000u + syscall, &tramp[0]); /* mov syscall, %g1 */
 248     __put_user(0x91d02010u, &tramp[1]);           /* t 0x10 */
 249 }
 250
 251 void setup_frame(int sig, struct target_sigaction *ka,
 252                  target_sigset_t *set, CPUSPARCState *env)
 253 {
 254     abi_ulong sf_addr;
 255     struct target_signal_frame *sf;
 256     size_t sf_size = sizeof(*sf) + sizeof(struct target_siginfo_fpu);
 257     int i;
 258
 259     sf_addr = get_sigframe(ka, env, sf_size);
 260     trace_user_setup_frame(env, sf_addr);
 261
 262     sf = lock_user(VERIFY_WRITE, sf_addr, sf_size, 0);
 263     if (!sf) {
 264         force_sigsegv(sig);
 265         return;
 266     }
 267
 268     /* 2. Save the current process state */
 269     save_pt_regs(&sf->regs, env);
 270     __put_user(0, &sf->extra_size);
 271
 272     save_fpu((struct target_siginfo_fpu *)(sf + 1), env);
 273     __put_user(sf_addr + sizeof(*sf), &sf->fpu_save);
 274
 275     __put_user(0, &sf->rwin_save);  /* TODO: save_rwin_state */
 276
 277     __put_user(set->sig[0], &sf->si_mask);
 278     for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
 279         __put_user(set->sig[i + 1], &sf->extramask[i]);
 280     }
 281
 282     save_reg_win(&sf->ss.win, env);
 283
 284     /* 3. signal handler back-trampoline and parameters */
 285     env->regwptr[WREG_SP] = sf_addr;
 286     env->regwptr[WREG_O0] = sig;
 287     env->regwptr[WREG_O1] = sf_addr +
 288             offsetof(struct target_signal_frame, regs);
 289     env->regwptr[WREG_O2] = sf_addr +
 290             offsetof(struct target_signal_frame, regs);
 291
 292     /* 4. signal handler */
 293     env->pc = ka->_sa_handler;
 294     env->npc = env->pc + 4;
 295
 296     /* 5. return to kernel instructions */
 297     if (ka->ka_restorer) {
 298         env->regwptr[WREG_O7] = ka->ka_restorer;
 299     } else {
 300         /* Not used, but retain for ABI compatibility. */
 301         install_sigtramp(sf->insns, TARGET_NR_sigreturn);
 302         env->regwptr[WREG_O7] = default_sigreturn;
 303     }
 304     unlock_user(sf, sf_addr, sf_size);
 305 }
 306 #endif /* TARGET_ARCH_HAS_SETUP_FRAME */
 307
 308 void setup_rt_frame(int sig, struct target_sigaction *ka,
 309                     target_siginfo_t *info,
 310                     target_sigset_t *set, CPUSPARCState *env)
 311 {
 312     abi_ulong sf_addr;
 313     struct target_rt_signal_frame *sf;
 314     size_t sf_size = sizeof(*sf) + sizeof(struct target_siginfo_fpu);
 315
 316     sf_addr = get_sigframe(ka, env, sf_size);
 317     trace_user_setup_rt_frame(env, sf_addr);
 318
 319     sf = lock_user(VERIFY_WRITE, sf_addr, sf_size, 0);
 320     if (!sf) {
 321         force_sigsegv(sig);
 322         return;
 323     }
 324
 325     /* 2. Save the current process state */
 326     save_reg_win(&sf->ss.win, env);
 327     save_pt_regs(&sf->regs, env);
 328
 329     save_fpu((struct target_siginfo_fpu *)(sf + 1), env);
 330     __put_user(sf_addr + sizeof(*sf), &sf->fpu_save);
 331
 332     __put_user(0, &sf->rwin_save);  /* TODO: save_rwin_state */
 333
 334     tswap_siginfo(&sf->info, info);
 335     tswap_sigset(&sf->mask, set);
 336     target_save_altstack(&sf->stack, env);
 337
 338 #ifdef TARGET_ABI32
 339     __put_user(0, &sf->extra_size);
 340 #endif
 341
 342     /* 3. signal handler back-trampoline and parameters */
 343     env->regwptr[WREG_SP] = sf_addr - TARGET_STACK_BIAS;
 344     env->regwptr[WREG_O0] = sig;
 345     env->regwptr[WREG_O1] =
 346         sf_addr + offsetof(struct target_rt_signal_frame, info);
 347 #ifdef TARGET_ABI32
 348     env->regwptr[WREG_O2] =
 349         sf_addr + offsetof(struct target_rt_signal_frame, regs);
 350 #else
 351     env->regwptr[WREG_O2] = env->regwptr[WREG_O1];
 352 #endif
 353
 354     /* 4. signal handler */
 355     env->pc = ka->_sa_handler;
 356     env->npc = env->pc + 4;
 357
 358     /* 5. return to kernel instructions */
 359 #ifdef TARGET_ABI32
 360     if (ka->ka_restorer) {
 361         env->regwptr[WREG_O7] = ka->ka_restorer;
 362     } else {
 363         /* Not used, but retain for ABI compatibility. */
 364         install_sigtramp(sf->insns, TARGET_NR_rt_sigreturn);
 365         env->regwptr[WREG_O7] = default_rt_sigreturn;
 366     }
 367 #else
 368     env->regwptr[WREG_O7] = ka->ka_restorer;
 369 #endif
 370
 371     unlock_user(sf, sf_addr, sf_size);
 372 }
 373
 374 long do_sigreturn(CPUSPARCState *env)
 375 {
 376 #ifdef TARGET_ARCH_HAS_SETUP_FRAME
 377     abi_ulong sf_addr;
 378     struct target_signal_frame *sf = NULL;
 379     abi_ulong pc, npc, ptr;
 380     target_sigset_t set;
 381     sigset_t host_set;
 382     int i;
 383
 384     sf_addr = env->regwptr[WREG_SP];
 385     trace_user_do_sigreturn(env, sf_addr);
 386
 387     /* 1. Make sure we are not getting garbage from the user */
 388     if ((sf_addr & 15) || !lock_user_struct(VERIFY_READ, sf, sf_addr, 1)) {
 389         goto segv_and_exit;
 390     }
 391
 392     /* Make sure stack pointer is aligned.  */
 393     __get_user(ptr, &sf->regs.u_regs[14]);
 394     if (ptr & 7) {
 395         goto segv_and_exit;
 396     }
 397
 398     /* Make sure instruction pointers are aligned.  */
 399     __get_user(pc, &sf->regs.pc);
 400     __get_user(npc, &sf->regs.npc);
 401     if ((pc | npc) & 3) {
 402         goto segv_and_exit;
 403     }
 404
 405     /* 2. Restore the state */
 406     restore_pt_regs(&sf->regs, env);
 407     env->pc = pc;
 408     env->npc = npc;
 409
 410     __get_user(ptr, &sf->fpu_save);
 411     if (ptr) {
 412         struct target_siginfo_fpu *fpu;
 413         if ((ptr & 3) || !lock_user_struct(VERIFY_READ, fpu, ptr, 1)) {
 414             goto segv_and_exit;
 415         }
 416         restore_fpu(fpu, env);
 417         unlock_user_struct(fpu, ptr, 0);
 418     }
 419
 420     __get_user(ptr, &sf->rwin_save);
 421     if (ptr) {
 422         goto segv_and_exit;  /* TODO: restore_rwin */
 423     }
 424
 425     __get_user(set.sig[0], &sf->si_mask);
 426     for (i = 1; i < TARGET_NSIG_WORDS; i++) {
 427         __get_user(set.sig[i], &sf->extramask[i - 1]);
 428     }
 429
 430     target_to_host_sigset_internal(&host_set, &set);
 431     set_sigmask(&host_set);
 432
 433     unlock_user_struct(sf, sf_addr, 0);
 434     return -QEMU_ESIGRETURN;
 435
 436  segv_and_exit:
 437     unlock_user_struct(sf, sf_addr, 0);
 438     force_sig(TARGET_SIGSEGV);
 439     return -QEMU_ESIGRETURN;
 440 #else
 441     return -TARGET_ENOSYS;
 442 #endif
 443 }
 444
 445 long do_rt_sigreturn(CPUSPARCState *env)
 446 {
 447     abi_ulong sf_addr, tpc, tnpc, ptr;
 448     struct target_rt_signal_frame *sf = NULL;
 449     sigset_t set;
 450
 451     sf_addr = get_sp_from_cpustate(env);
 452     trace_user_do_rt_sigreturn(env, sf_addr);
 453
 454     /* 1. Make sure we are not getting garbage from the user */
 455     if ((sf_addr & 15) || !lock_user_struct(VERIFY_READ, sf, sf_addr, 1)) {
 456         goto segv_and_exit;
 457     }
 458
 459     /* Validate SP alignment.  */
 460     __get_user(ptr, &sf->regs.u_regs[8 + WREG_SP]);
 461     if ((ptr + TARGET_STACK_BIAS) & 7) {
 462         goto segv_and_exit;
 463     }
 464
 465     /* Validate PC and NPC alignment.  */
 466     __get_user(tpc, &sf->regs.pc);
 467     __get_user(tnpc, &sf->regs.npc);
 468     if ((tpc | tnpc) & 3) {
 469         goto segv_and_exit;
 470     }
 471
 472     /* 2. Restore the state */
 473     restore_pt_regs(&sf->regs, env);
 474
 475     __get_user(ptr, &sf->fpu_save);
 476     if (ptr) {
 477         struct target_siginfo_fpu *fpu;
 478         if ((ptr & 7) || !lock_user_struct(VERIFY_READ, fpu, ptr, 1)) {
 479             goto segv_and_exit;
 480         }
 481         restore_fpu(fpu, env);
 482         unlock_user_struct(fpu, ptr, 0);
 483     }
 484
 485     __get_user(ptr, &sf->rwin_save);
 486     if (ptr) {
 487         goto segv_and_exit;  /* TODO: restore_rwin_state */
 488     }
 489
 490     target_restore_altstack(&sf->stack, env);
 491     target_to_host_sigset(&set, &sf->mask);
 492     set_sigmask(&set);
 493
 494     env->pc = tpc;
 495     env->npc = tnpc;
 496
 497     unlock_user_struct(sf, sf_addr, 0);
 498     return -QEMU_ESIGRETURN;
 499
 500  segv_and_exit:
 501     unlock_user_struct(sf, sf_addr, 0);
 502     force_sig(TARGET_SIGSEGV);
 503     return -QEMU_ESIGRETURN;
 504 }
 505
 506 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
 507 #define SPARC_MC_TSTATE 0
 508 #define SPARC_MC_PC 1
 509 #define SPARC_MC_NPC 2
 510 #define SPARC_MC_Y 3
 511 #define SPARC_MC_G1 4
 512 #define SPARC_MC_G2 5
 513 #define SPARC_MC_G3 6
 514 #define SPARC_MC_G4 7
 515 #define SPARC_MC_G5 8
 516 #define SPARC_MC_G6 9
 517 #define SPARC_MC_G7 10
 518 #define SPARC_MC_O0 11
 519 #define SPARC_MC_O1 12
 520 #define SPARC_MC_O2 13
 521 #define SPARC_MC_O3 14
 522 #define SPARC_MC_O4 15
 523 #define SPARC_MC_O5 16
 524 #define SPARC_MC_O6 17
 525 #define SPARC_MC_O7 18
 526 #define SPARC_MC_NGREG 19
 527
 528 typedef abi_ulong target_mc_greg_t;
 529 typedef target_mc_greg_t target_mc_gregset_t[SPARC_MC_NGREG];
 530
 531 struct target_mc_fq {
 532     abi_ulong mcfq_addr;
 533     uint32_t mcfq_insn;
 534 };
 535
 536 /*
 537  * Note the manual 16-alignment; the kernel gets this because it
 538  * includes a "long double qregs[16]" in the mcpu_fregs union,
 539  * which we can't do.
 540  */
 541 struct target_mc_fpu {
 542     union {
 543         uint32_t sregs[32];
 544         uint64_t dregs[32];
 545         //uint128_t qregs[16];
 546     } mcfpu_fregs;
 547     abi_ulong mcfpu_fsr;
 548     abi_ulong mcfpu_fprs;
 549     abi_ulong mcfpu_gsr;
 550     abi_ulong mcfpu_fq;
 551     unsigned char mcfpu_qcnt;
 552     unsigned char mcfpu_qentsz;
 553     unsigned char mcfpu_enab;
 554 } __attribute__((aligned(16)));
 555 typedef struct target_mc_fpu target_mc_fpu_t;
 556
 557 typedef struct {
 558     target_mc_gregset_t mc_gregs;
 559     target_mc_greg_t mc_fp;
 560     target_mc_greg_t mc_i7;
 561     target_mc_fpu_t mc_fpregs;
 562 } target_mcontext_t;
 563
 564 struct target_ucontext {
 565     abi_ulong tuc_link;
 566     abi_ulong tuc_flags;
 567     target_sigset_t tuc_sigmask;
 568     target_mcontext_t tuc_mcontext;
 569 };
 570
 571 /* {set, get}context() needed for 64-bit SparcLinux userland. */
 572 void sparc64_set_context(CPUSPARCState *env)
 573 {
 574     abi_ulong ucp_addr;
 575     struct target_ucontext *ucp;
 576     target_mc_gregset_t *grp;
 577     target_mc_fpu_t *fpup;
 578     abi_ulong pc, npc, tstate;
 579     unsigned int i;
 580     unsigned char fenab;
 581
 582     ucp_addr = env->regwptr[WREG_O0];
 583     if (!lock_user_struct(VERIFY_READ, ucp, ucp_addr, 1)) {
 584         goto do_sigsegv;
 585     }
 586     grp  = &ucp->tuc_mcontext.mc_gregs;
 587     __get_user(pc, &((*grp)[SPARC_MC_PC]));
 588     __get_user(npc, &((*grp)[SPARC_MC_NPC]));
 589     if ((pc | npc) & 3) {
 590         goto do_sigsegv;
 591     }
 592     if (env->regwptr[WREG_O1]) {
 593         target_sigset_t target_set;
 594         sigset_t set;
 595
 596         if (TARGET_NSIG_WORDS == 1) {
 597             __get_user(target_set.sig[0], &ucp->tuc_sigmask.sig[0]);
 598         } else {
 599             abi_ulong *src, *dst;
 600             src = ucp->tuc_sigmask.sig;
 601             dst = target_set.sig;
 602             for (i = 0; i < TARGET_NSIG_WORDS; i++, dst++, src++) {
 603                 __get_user(*dst, src);
 604             }
 605         }
 606         target_to_host_sigset_internal(&set, &target_set);
 607         set_sigmask(&set);
 608     }
 609     env->pc = pc;
 610     env->npc = npc;
 611     __get_user(env->y, &((*grp)[SPARC_MC_Y]));
 612     __get_user(tstate, &((*grp)[SPARC_MC_TSTATE]));
 613     /* Honour TSTATE_ASI, TSTATE_ICC and TSTATE_XCC only */
 614     env->asi = (tstate >> 24) & 0xff;
 615     cpu_put_ccr(env, (tstate >> 32) & 0xff);
 616     __get_user(env->gregs[1], (&(*grp)[SPARC_MC_G1]));
 617     __get_user(env->gregs[2], (&(*grp)[SPARC_MC_G2]));
 618     __get_user(env->gregs[3], (&(*grp)[SPARC_MC_G3]));
 619     __get_user(env->gregs[4], (&(*grp)[SPARC_MC_G4]));
 620     __get_user(env->gregs[5], (&(*grp)[SPARC_MC_G5]));
 621     __get_user(env->gregs[6], (&(*grp)[SPARC_MC_G6]));
 622     /* Skip g7 as that's the thread register in userspace */
 623
 624     /*
 625      * Note that unlike the kernel, we didn't need to mess with the
 626      * guest register window state to save it into a pt_regs to run
 627      * the kernel. So for us the guest's O regs are still in WREG_O*
 628      * (unlike the kernel which has put them in UREG_I* in a pt_regs)
 629      * and the fp and i7 are still in WREG_I6 and WREG_I7 and don't
 630      * need to be written back to userspace memory.
 631      */
 632     __get_user(env->regwptr[WREG_O0], (&(*grp)[SPARC_MC_O0]));
 633     __get_user(env->regwptr[WREG_O1], (&(*grp)[SPARC_MC_O1]));
 634     __get_user(env->regwptr[WREG_O2], (&(*grp)[SPARC_MC_O2]));
 635     __get_user(env->regwptr[WREG_O3], (&(*grp)[SPARC_MC_O3]));
 636     __get_user(env->regwptr[WREG_O4], (&(*grp)[SPARC_MC_O4]));
 637     __get_user(env->regwptr[WREG_O5], (&(*grp)[SPARC_MC_O5]));
 638     __get_user(env->regwptr[WREG_O6], (&(*grp)[SPARC_MC_O6]));
 639     __get_user(env->regwptr[WREG_O7], (&(*grp)[SPARC_MC_O7]));
 640
 641     __get_user(env->regwptr[WREG_FP], &(ucp->tuc_mcontext.mc_fp));
 642     __get_user(env->regwptr[WREG_I7], &(ucp->tuc_mcontext.mc_i7));
 643
 644     fpup = &ucp->tuc_mcontext.mc_fpregs;
 645
 646     __get_user(fenab, &(fpup->mcfpu_enab));
 647     if (fenab) {
 648         abi_ulong fprs;
 649
 650         /*
 651          * We use the FPRS from the guest only in deciding whether
 652          * to restore the upper, lower, or both banks of the FPU regs.
 653          * The kernel here writes the FPU register data into the
 654          * process's current_thread_info state and unconditionally
 655          * clears FPRS and TSTATE_PEF: this disables the FPU so that the
 656          * next FPU-disabled trap will copy the data out of
 657          * current_thread_info and into the real FPU registers.
 658          * QEMU doesn't need to handle lazy-FPU-state-restoring like that,
 659          * so we always load the data directly into the FPU registers
 660          * and leave FPRS and TSTATE_PEF alone (so the FPU stays enabled).
 661          * Note that because we (and the kernel) always write zeroes for
 662          * the fenab and fprs in sparc64_get_context() none of this code
 663          * will execute unless the guest manually constructed or changed
 664          * the context structure.
 665          */
 666         __get_user(fprs, &(fpup->mcfpu_fprs));
 667         if (fprs & FPRS_DL) {
 668             for (i = 0; i < 16; i++) {
 669                 __get_user(env->fpr[i].ll, &(fpup->mcfpu_fregs.dregs[i]));
 670             }
 671         }
 672         if (fprs & FPRS_DU) {
 673             for (i = 16; i < 32; i++) {
 674                 __get_user(env->fpr[i].ll, &(fpup->mcfpu_fregs.dregs[i]));
 675             }
 676         }
 677         __get_user(env->fsr, &(fpup->mcfpu_fsr));
 678         __get_user(env->gsr, &(fpup->mcfpu_gsr));
 679     }
 680     unlock_user_struct(ucp, ucp_addr, 0);
 681     return;
 682 do_sigsegv:
 683     unlock_user_struct(ucp, ucp_addr, 0);
 684     force_sig(TARGET_SIGSEGV);
 685 }
 686
 687 void sparc64_get_context(CPUSPARCState *env)
 688 {
 689     abi_ulong ucp_addr;
 690     struct target_ucontext *ucp;
 691     target_mc_gregset_t *grp;
 692     target_mcontext_t *mcp;
 693     int err;
 694     unsigned int i;
 695     target_sigset_t target_set;
 696     sigset_t set;
 697
 698     ucp_addr = env->regwptr[WREG_O0];
 699     if (!lock_user_struct(VERIFY_WRITE, ucp, ucp_addr, 0)) {
 700         goto do_sigsegv;
 701     }
 702
 703     memset(ucp, 0, sizeof(*ucp));
 704
 705     mcp = &ucp->tuc_mcontext;
 706     grp = &mcp->mc_gregs;
 707
 708     /* Skip over the trap instruction, first. */
 709     env->pc = env->npc;
 710     env->npc += 4;
 711
 712     /* If we're only reading the signal mask then do_sigprocmask()
 713      * is guaranteed not to fail, which is important because we don't
 714      * have any way to signal a failure or restart this operation since
 715      * this is not a normal syscall.
 716      */
 717     err = do_sigprocmask(0, NULL, &set);
 718     assert(err == 0);
 719     host_to_target_sigset_internal(&target_set, &set);
 720     if (TARGET_NSIG_WORDS == 1) {
 721         __put_user(target_set.sig[0],
 722                    (abi_ulong *)&ucp->tuc_sigmask);
 723     } else {
 724         abi_ulong *src, *dst;
 725         src = target_set.sig;
 726         dst = ucp->tuc_sigmask.sig;
 727         for (i = 0; i < TARGET_NSIG_WORDS; i++, dst++, src++) {
 728             __put_user(*src, dst);
 729         }
 730     }
 731
 732     __put_user(sparc64_tstate(env), &((*grp)[SPARC_MC_TSTATE]));
 733     __put_user(env->pc, &((*grp)[SPARC_MC_PC]));
 734     __put_user(env->npc, &((*grp)[SPARC_MC_NPC]));
 735     __put_user(env->y, &((*grp)[SPARC_MC_Y]));
 736     __put_user(env->gregs[1], &((*grp)[SPARC_MC_G1]));
 737     __put_user(env->gregs[2], &((*grp)[SPARC_MC_G2]));
 738     __put_user(env->gregs[3], &((*grp)[SPARC_MC_G3]));
 739     __put_user(env->gregs[4], &((*grp)[SPARC_MC_G4]));
 740     __put_user(env->gregs[5], &((*grp)[SPARC_MC_G5]));
 741     __put_user(env->gregs[6], &((*grp)[SPARC_MC_G6]));
 742     __put_user(env->gregs[7], &((*grp)[SPARC_MC_G7]));
 743
 744     /*
 745      * Note that unlike the kernel, we didn't need to mess with the
 746      * guest register window state to save it into a pt_regs to run
 747      * the kernel. So for us the guest's O regs are still in WREG_O*
 748      * (unlike the kernel which has put them in UREG_I* in a pt_regs)
 749      * and the fp and i7 are still in WREG_I6 and WREG_I7 and don't
 750      * need to be fished out of userspace memory.
 751      */
 752     __put_user(env->regwptr[WREG_O0], &((*grp)[SPARC_MC_O0]));
 753     __put_user(env->regwptr[WREG_O1], &((*grp)[SPARC_MC_O1]));
 754     __put_user(env->regwptr[WREG_O2], &((*grp)[SPARC_MC_O2]));
 755     __put_user(env->regwptr[WREG_O3], &((*grp)[SPARC_MC_O3]));
 756     __put_user(env->regwptr[WREG_O4], &((*grp)[SPARC_MC_O4]));
 757     __put_user(env->regwptr[WREG_O5], &((*grp)[SPARC_MC_O5]));
 758     __put_user(env->regwptr[WREG_O6], &((*grp)[SPARC_MC_O6]));
 759     __put_user(env->regwptr[WREG_O7], &((*grp)[SPARC_MC_O7]));
 760
 761     __put_user(env->regwptr[WREG_FP], &(mcp->mc_fp));
 762     __put_user(env->regwptr[WREG_I7], &(mcp->mc_i7));
 763
 764     /*
 765      * We don't write out the FPU state. This matches the kernel's
 766      * implementation (which has the code for doing this but
 767      * hidden behind an "if (fenab)" where fenab is always 0).
 768      */
 769
 770     unlock_user_struct(ucp, ucp_addr, 1);
 771     return;
 772 do_sigsegv:
 773     unlock_user_struct(ucp, ucp_addr, 1);
 774     force_sig(TARGET_SIGSEGV);
 775 }
 776 #else
 777 void setup_sigtramp(abi_ulong sigtramp_page)
 778 {
 779     uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 2 * 8, 0);
 780     assert(tramp != NULL);
 781
 782     default_sigreturn = sigtramp_page;
 783     install_sigtramp(tramp, TARGET_NR_sigreturn);
 784
 785     default_rt_sigreturn = sigtramp_page + 8;
 786     install_sigtramp(tramp + 2, TARGET_NR_rt_sigreturn);
 787
 788     unlock_user(tramp, sigtramp_page, 2 * 8);
 789 }
 790 #endif