arch/sparc/kernel/process_64.c

   1 /*  arch/sparc64/kernel/process.c
   2  *
   3  *  Copyright (C) 1995, 1996, 2008 David S. Miller ([email protected])
   4  *  Copyright (C) 1996       Eddie C. Dost   ([email protected])
   5  *  Copyright (C) 1997, 1998 Jakub Jelinek   ([email protected])
   6  */
   7
   8 /*
   9  * This file handles the architecture-dependent parts of process handling..
  10  */
  11
  12 #include <stdarg.h>
  13
  14 #include <linux/errno.h>
  15 #include <linux/export.h>
  16 #include <linux/sched.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mm.h>
  19 #include <linux/fs.h>
  20 #include <linux/smp.h>
  21 #include <linux/stddef.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/slab.h>
  24 #include <linux/user.h>
  25 #include <linux/delay.h>
  26 #include <linux/compat.h>
  27 #include <linux/tick.h>
  28 #include <linux/init.h>
  29 #include <linux/cpu.h>
  30 #include <linux/perf_event.h>
  31 #include <linux/elfcore.h>
  32 #include <linux/sysrq.h>
  33 #include <linux/nmi.h>
  34
  35 #include <asm/uaccess.h>
  36 #include <asm/page.h>
  37 #include <asm/pgalloc.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/processor.h>
  40 #include <asm/pstate.h>
  41 #include <asm/elf.h>
  42 #include <asm/fpumacro.h>
  43 #include <asm/head.h>
  44 #include <asm/cpudata.h>
  45 #include <asm/mmu_context.h>
  46 #include <asm/unistd.h>
  47 #include <asm/hypervisor.h>
  48 #include <asm/syscalls.h>
  49 #include <asm/irq_regs.h>
  50 #include <asm/smp.h>
  51 #include <asm/pcr.h>
  52
  53 #include "kstack.h"
  54
  55 /* Idle loop support on sparc64. */
  56 void arch_cpu_idle(void)
  57 {
  58         if (tlb_type != hypervisor) {
  59                 touch_nmi_watchdog();
  60         } else {
  61                 unsigned long pstate;
  62
  63                 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
  64                  * the cpu sleep hypervisor call.
  65                  */
  66                 __asm__ __volatile__(
  67                         "rdpr %%pstate, %0\n\t"
  68                         "andn %0, %1, %0\n\t"
  69                         "wrpr %0, %%g0, %%pstate"
  70                         : "=&r" (pstate)
  71                         : "i" (PSTATE_IE));
  72
  73                 if (!need_resched() && !cpu_is_offline(smp_processor_id()))
  74                         sun4v_cpu_yield();
  75
  76                 /* Re-enable interrupts. */
  77                 __asm__ __volatile__(
  78                         "rdpr %%pstate, %0\n\t"
  79                         "or %0, %1, %0\n\t"
  80                         "wrpr %0, %%g0, %%pstate"
  81                         : "=&r" (pstate)
  82                         : "i" (PSTATE_IE));
  83         }
  84         local_irq_enable();
  85 }
  86
  87 #ifdef CONFIG_HOTPLUG_CPU
  88 void arch_cpu_idle_dead()
  89 {
  90         sched_preempt_enable_no_resched();
  91         cpu_play_dead();
  92 }
  93 #endif
  94
  95 #ifdef CONFIG_COMPAT
  96 static void show_regwindow32(struct pt_regs *regs)
  97 {
  98         struct reg_window32 __user *rw;
  99         struct reg_window32 r_w;
 100         mm_segment_t old_fs;
 101
 102         __asm__ __volatile__ ("flushw");
 103         rw = compat_ptr((unsigned)regs->u_regs[14]);
 104         old_fs = get_fs();
 105         set_fs (USER_DS);
 106         if (copy_from_user (&r_w, rw, sizeof(r_w))) {
 107                 set_fs (old_fs);
 108                 return;
 109         }
 110
 111         set_fs (old_fs);
 112         printk("l0: %08x l1: %08x l2: %08x l3: %08x "
 113                "l4: %08x l5: %08x l6: %08x l7: %08x\n",
 114                r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
 115                r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
 116         printk("i0: %08x i1: %08x i2: %08x i3: %08x "
 117                "i4: %08x i5: %08x i6: %08x i7: %08x\n",
 118                r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
 119                r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
 120 }
 121 #else
 122 #define show_regwindow32(regs)  do { } while (0)
 123 #endif
 124
 125 static void show_regwindow(struct pt_regs *regs)
 126 {
 127         struct reg_window __user *rw;
 128         struct reg_window *rwk;
 129         struct reg_window r_w;
 130         mm_segment_t old_fs;
 131
 132         if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
 133                 __asm__ __volatile__ ("flushw");
 134                 rw = (struct reg_window __user *)
 135                         (regs->u_regs[14] + STACK_BIAS);
 136                 rwk = (struct reg_window *)
 137                         (regs->u_regs[14] + STACK_BIAS);
 138                 if (!(regs->tstate & TSTATE_PRIV)) {
 139                         old_fs = get_fs();
 140                         set_fs (USER_DS);
 141                         if (copy_from_user (&r_w, rw, sizeof(r_w))) {
 142                                 set_fs (old_fs);
 143                                 return;
 144                         }
 145                         rwk = &r_w;
 146                         set_fs (old_fs);
 147                 }
 148         } else {
 149                 show_regwindow32(regs);
 150                 return;
 151         }
 152         printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
 153                rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
 154         printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
 155                rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
 156         printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
 157                rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
 158         printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
 159                rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
 160         if (regs->tstate & TSTATE_PRIV)
 161                 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
 162 }
 163
 164 void show_regs(struct pt_regs *regs)
 165 {
 166         show_regs_print_info(KERN_DEFAULT);
 167
 168         printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x    %s\n", regs->tstate,
 169                regs->tpc, regs->tnpc, regs->y, print_tainted());
 170         printk("TPC: <%pS>\n", (void *) regs->tpc);
 171         printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
 172                regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
 173                regs->u_regs[3]);
 174         printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
 175                regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
 176                regs->u_regs[7]);
 177         printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
 178                regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
 179                regs->u_regs[11]);
 180         printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
 181                regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
 182                regs->u_regs[15]);
 183         printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
 184         show_regwindow(regs);
 185         show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
 186 }
 187
 188 union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
 189 static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
 190
 191 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
 192                               int this_cpu)
 193 {
 194         struct global_reg_snapshot *rp;
 195
 196         flushw_all();
 197
 198         rp = &global_cpu_snapshot[this_cpu].reg;
 199
 200         rp->tstate = regs->tstate;
 201         rp->tpc = regs->tpc;
 202         rp->tnpc = regs->tnpc;
 203         rp->o7 = regs->u_regs[UREG_I7];
 204
 205         if (regs->tstate & TSTATE_PRIV) {
 206                 struct reg_window *rw;
 207
 208                 rw = (struct reg_window *)
 209                         (regs->u_regs[UREG_FP] + STACK_BIAS);
 210                 if (kstack_valid(tp, (unsigned long) rw)) {
 211                         rp->i7 = rw->ins[7];
 212                         rw = (struct reg_window *)
 213                                 (rw->ins[6] + STACK_BIAS);
 214                         if (kstack_valid(tp, (unsigned long) rw))
 215                                 rp->rpc = rw->ins[7];
 216                 }
 217         } else {
 218                 rp->i7 = 0;
 219                 rp->rpc = 0;
 220         }
 221         rp->thread = tp;
 222 }
 223
 224 /* In order to avoid hangs we do not try to synchronize with the
 225  * global register dump client cpus.  The last store they make is to
 226  * the thread pointer, so do a short poll waiting for that to become
 227  * non-NULL.
 228  */
 229 static void __global_reg_poll(struct global_reg_snapshot *gp)
 230 {
 231         int limit = 0;
 232
 233         while (!gp->thread && ++limit < 100) {
 234                 barrier();
 235                 udelay(1);
 236         }
 237 }
 238
 239 void arch_trigger_all_cpu_backtrace(void)
 240 {
 241         struct thread_info *tp = current_thread_info();
 242         struct pt_regs *regs = get_irq_regs();
 243         unsigned long flags;
 244         int this_cpu, cpu;
 245
 246         if (!regs)
 247                 regs = tp->kregs;
 248
 249         spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
 250
 251         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 252
 253         this_cpu = raw_smp_processor_id();
 254
 255         __global_reg_self(tp, regs, this_cpu);
 256
 257         smp_fetch_global_regs();
 258
 259         for_each_online_cpu(cpu) {
 260                 struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg;
 261
 262                 __global_reg_poll(gp);
 263
 264                 tp = gp->thread;
 265                 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
 266                        (cpu == this_cpu ? '*' : ' '), cpu,
 267                        gp->tstate, gp->tpc, gp->tnpc,
 268                        ((tp && tp->task) ? tp->task->comm : "NULL"),
 269                        ((tp && tp->task) ? tp->task->pid : -1));
 270
 271                 if (gp->tstate & TSTATE_PRIV) {
 272                         printk("             TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
 273                                (void *) gp->tpc,
 274                                (void *) gp->o7,
 275                                (void *) gp->i7,
 276                                (void *) gp->rpc);
 277                 } else {
 278                         printk("             TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
 279                                gp->tpc, gp->o7, gp->i7, gp->rpc);
 280                 }
 281         }
 282
 283         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 284
 285         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
 286 }
 287
 288 #ifdef CONFIG_MAGIC_SYSRQ
 289
 290 static void sysrq_handle_globreg(int key)
 291 {
 292         arch_trigger_all_cpu_backtrace();
 293 }
 294
 295 static struct sysrq_key_op sparc_globalreg_op = {
 296         .handler        = sysrq_handle_globreg,
 297         .help_msg       = "global-regs(y)",
 298         .action_msg     = "Show Global CPU Regs",
 299 };
 300
 301 static void __global_pmu_self(int this_cpu)
 302 {
 303         struct global_pmu_snapshot *pp;
 304         int i, num;
 305
 306         pp = &global_cpu_snapshot[this_cpu].pmu;
 307
 308         num = 1;
 309         if (tlb_type == hypervisor &&
 310             sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
 311                 num = 4;
 312
 313         for (i = 0; i < num; i++) {
 314                 pp->pcr[i] = pcr_ops->read_pcr(i);
 315                 pp->pic[i] = pcr_ops->read_pic(i);
 316         }
 317 }
 318
 319 static void __global_pmu_poll(struct global_pmu_snapshot *pp)
 320 {
 321         int limit = 0;
 322
 323         while (!pp->pcr[0] && ++limit < 100) {
 324                 barrier();
 325                 udelay(1);
 326         }
 327 }
 328
 329 static void pmu_snapshot_all_cpus(void)
 330 {
 331         unsigned long flags;
 332         int this_cpu, cpu;
 333
 334         spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
 335
 336         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 337
 338         this_cpu = raw_smp_processor_id();
 339
 340         __global_pmu_self(this_cpu);
 341
 342         smp_fetch_global_pmu();
 343
 344         for_each_online_cpu(cpu) {
 345                 struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
 346
 347                 __global_pmu_poll(pp);
 348
 349                 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
 350                        (cpu == this_cpu ? '*' : ' '), cpu,
 351                        pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
 352                        pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
 353         }
 354
 355         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 356
 357         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
 358 }
 359
 360 static void sysrq_handle_globpmu(int key)
 361 {
 362         pmu_snapshot_all_cpus();
 363 }
 364
 365 static struct sysrq_key_op sparc_globalpmu_op = {
 366         .handler        = sysrq_handle_globpmu,
 367         .help_msg       = "global-pmu(x)",
 368         .action_msg     = "Show Global PMU Regs",
 369 };
 370
 371 static int __init sparc_sysrq_init(void)
 372 {
 373         int ret = register_sysrq_key('y', &sparc_globalreg_op);
 374
 375         if (!ret)
 376                 ret = register_sysrq_key('x', &sparc_globalpmu_op);
 377         return ret;
 378 }
 379
 380 core_initcall(sparc_sysrq_init);
 381
 382 #endif
 383
 384 unsigned long thread_saved_pc(struct task_struct *tsk)
 385 {
 386         struct thread_info *ti = task_thread_info(tsk);
 387         unsigned long ret = 0xdeadbeefUL;
 388
 389         if (ti && ti->ksp) {
 390                 unsigned long *sp;
 391                 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
 392                 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
 393                     sp[14]) {
 394                         unsigned long *fp;
 395                         fp = (unsigned long *)(sp[14] + STACK_BIAS);
 396                         if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
 397                                 ret = fp[15];
 398                 }
 399         }
 400         return ret;
 401 }
 402
 403 /* Free current thread data structures etc.. */
 404 void exit_thread(void)
 405 {
 406         struct thread_info *t = current_thread_info();
 407
 408         if (t->utraps) {
 409                 if (t->utraps[0] < 2)
 410                         kfree (t->utraps);
 411                 else
 412                         t->utraps[0]--;
 413         }
 414 }
 415
 416 void flush_thread(void)
 417 {
 418         struct thread_info *t = current_thread_info();
 419         struct mm_struct *mm;
 420
 421         mm = t->task->mm;
 422         if (mm)
 423                 tsb_context_switch(mm);
 424
 425         set_thread_wsaved(0);
 426
 427         /* Clear FPU register state. */
 428         t->fpsaved[0] = 0;
 429 }
 430
 431 /* It's a bit more tricky when 64-bit tasks are involved... */
 432 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
 433 {
 434         bool stack_64bit = test_thread_64bit_stack(psp);
 435         unsigned long fp, distance, rval;
 436
 437         if (stack_64bit) {
 438                 csp += STACK_BIAS;
 439                 psp += STACK_BIAS;
 440                 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
 441                 fp += STACK_BIAS;
 442                 if (test_thread_flag(TIF_32BIT))
 443                         fp &= 0xffffffff;
 444         } else
 445                 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
 446
 447         /* Now align the stack as this is mandatory in the Sparc ABI
 448          * due to how register windows work.  This hides the
 449          * restriction from thread libraries etc.
 450          */
 451         csp &= ~15UL;
 452
 453         distance = fp - psp;
 454         rval = (csp - distance);
 455         if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
 456                 rval = 0;
 457         else if (!stack_64bit) {
 458                 if (put_user(((u32)csp),
 459                              &(((struct reg_window32 __user *)rval)->ins[6])))
 460                         rval = 0;
 461         } else {
 462                 if (put_user(((u64)csp - STACK_BIAS),
 463                              &(((struct reg_window __user *)rval)->ins[6])))
 464                         rval = 0;
 465                 else
 466                         rval = rval - STACK_BIAS;
 467         }
 468
 469         return rval;
 470 }
 471
 472 /* Standard stuff. */
 473 static inline void shift_window_buffer(int first_win, int last_win,
 474                                        struct thread_info *t)
 475 {
 476         int i;
 477
 478         for (i = first_win; i < last_win; i++) {
 479                 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
 480                 memcpy(&t->reg_window[i], &t->reg_window[i+1],
 481                        sizeof(struct reg_window));
 482         }
 483 }
 484
 485 void synchronize_user_stack(void)
 486 {
 487         struct thread_info *t = current_thread_info();
 488         unsigned long window;
 489
 490         flush_user_windows();
 491         if ((window = get_thread_wsaved()) != 0) {
 492                 window -= 1;
 493                 do {
 494                         struct reg_window *rwin = &t->reg_window[window];
 495                         int winsize = sizeof(struct reg_window);
 496                         unsigned long sp;
 497
 498                         sp = t->rwbuf_stkptrs[window];
 499
 500                         if (test_thread_64bit_stack(sp))
 501                                 sp += STACK_BIAS;
 502                         else
 503                                 winsize = sizeof(struct reg_window32);
 504
 505                         if (!copy_to_user((char __user *)sp, rwin, winsize)) {
 506                                 shift_window_buffer(window, get_thread_wsaved() - 1, t);
 507                                 set_thread_wsaved(get_thread_wsaved() - 1);
 508                         }
 509                 } while (window--);
 510         }
 511 }
 512
 513 static void stack_unaligned(unsigned long sp)
 514 {
 515         siginfo_t info;
 516
 517         info.si_signo = SIGBUS;
 518         info.si_errno = 0;
 519         info.si_code = BUS_ADRALN;
 520         info.si_addr = (void __user *) sp;
 521         info.si_trapno = 0;
 522         force_sig_info(SIGBUS, &info, current);
 523 }
 524
 525 void fault_in_user_windows(void)
 526 {
 527         struct thread_info *t = current_thread_info();
 528         unsigned long window;
 529
 530         flush_user_windows();
 531         window = get_thread_wsaved();
 532
 533         if (likely(window != 0)) {
 534                 window -= 1;
 535                 do {
 536                         struct reg_window *rwin = &t->reg_window[window];
 537                         int winsize = sizeof(struct reg_window);
 538                         unsigned long sp;
 539
 540                         sp = t->rwbuf_stkptrs[window];
 541
 542                         if (test_thread_64bit_stack(sp))
 543                                 sp += STACK_BIAS;
 544                         else
 545                                 winsize = sizeof(struct reg_window32);
 546
 547                         if (unlikely(sp & 0x7UL))
 548                                 stack_unaligned(sp);
 549
 550                         if (unlikely(copy_to_user((char __user *)sp,
 551                                                   rwin, winsize)))
 552                                 goto barf;
 553                 } while (window--);
 554         }
 555         set_thread_wsaved(0);
 556         return;
 557
 558 barf:
 559         set_thread_wsaved(window + 1);
 560         do_exit(SIGILL);
 561 }
 562
 563 asmlinkage long sparc_do_fork(unsigned long clone_flags,
 564                               unsigned long stack_start,
 565                               struct pt_regs *regs,
 566                               unsigned long stack_size)
 567 {
 568         int __user *parent_tid_ptr, *child_tid_ptr;
 569         unsigned long orig_i1 = regs->u_regs[UREG_I1];
 570         long ret;
 571
 572 #ifdef CONFIG_COMPAT
 573         if (test_thread_flag(TIF_32BIT)) {
 574                 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
 575                 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
 576         } else
 577 #endif
 578         {
 579                 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
 580                 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
 581         }
 582
 583         ret = do_fork(clone_flags, stack_start, stack_size,
 584                       parent_tid_ptr, child_tid_ptr);
 585
 586         /* If we get an error and potentially restart the system
 587          * call, we're screwed because copy_thread() clobbered
 588          * the parent's %o1.  So detect that case and restore it
 589          * here.
 590          */
 591         if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
 592                 regs->u_regs[UREG_I1] = orig_i1;
 593
 594         return ret;
 595 }
 596
 597 /* Copy a Sparc thread.  The fork() return value conventions
 598  * under SunOS are nothing short of bletcherous:
 599  * Parent -->  %o0 == childs  pid, %o1 == 0
 600  * Child  -->  %o0 == parents pid, %o1 == 1
 601  */
 602 int copy_thread(unsigned long clone_flags, unsigned long sp,
 603                 unsigned long arg, struct task_struct *p)
 604 {
 605         struct thread_info *t = task_thread_info(p);
 606         struct pt_regs *regs = current_pt_regs();
 607         struct sparc_stackf *parent_sf;
 608         unsigned long child_stack_sz;
 609         char *child_trap_frame;
 610
 611         /* Calculate offset to stack_frame & pt_regs */
 612         child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
 613         child_trap_frame = (task_stack_page(p) +
 614                             (THREAD_SIZE - child_stack_sz));
 615
 616         t->new_child = 1;
 617         t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
 618         t->kregs = (struct pt_regs *) (child_trap_frame +
 619                                        sizeof(struct sparc_stackf));
 620         t->fpsaved[0] = 0;
 621
 622         if (unlikely(p->flags & PF_KTHREAD)) {
 623                 memset(child_trap_frame, 0, child_stack_sz);
 624                 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
 625                         (current_pt_regs()->tstate + 1) & TSTATE_CWP;
 626                 t->current_ds = ASI_P;
 627                 t->kregs->u_regs[UREG_G1] = sp; /* function */
 628                 t->kregs->u_regs[UREG_G2] = arg;
 629                 return 0;
 630         }
 631
 632         parent_sf = ((struct sparc_stackf *) regs) - 1;
 633         memcpy(child_trap_frame, parent_sf, child_stack_sz);
 634         if (t->flags & _TIF_32BIT) {
 635                 sp &= 0x00000000ffffffffUL;
 636                 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
 637         }
 638         t->kregs->u_regs[UREG_FP] = sp;
 639         __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
 640                 (regs->tstate + 1) & TSTATE_CWP;
 641         t->current_ds = ASI_AIUS;
 642         if (sp != regs->u_regs[UREG_FP]) {
 643                 unsigned long csp;
 644
 645                 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
 646                 if (!csp)
 647                         return -EFAULT;
 648                 t->kregs->u_regs[UREG_FP] = csp;
 649         }
 650         if (t->utraps)
 651                 t->utraps[0]++;
 652
 653         /* Set the return value for the child. */
 654         t->kregs->u_regs[UREG_I0] = current->pid;
 655         t->kregs->u_regs[UREG_I1] = 1;
 656
 657         /* Set the second return value for the parent. */
 658         regs->u_regs[UREG_I1] = 0;
 659
 660         if (clone_flags & CLONE_SETTLS)
 661                 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
 662
 663         return 0;
 664 }
 665
 666 typedef struct {
 667         union {
 668                 unsigned int    pr_regs[32];
 669                 unsigned long   pr_dregs[16];
 670         } pr_fr;
 671         unsigned int __unused;
 672         unsigned int    pr_fsr;
 673         unsigned char   pr_qcnt;
 674         unsigned char   pr_q_entrysize;
 675         unsigned char   pr_en;
 676         unsigned int    pr_q[64];
 677 } elf_fpregset_t32;
 678
 679 /*
 680  * fill in the fpu structure for a core dump.
 681  */
 682 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
 683 {
 684         unsigned long *kfpregs = current_thread_info()->fpregs;
 685         unsigned long fprs = current_thread_info()->fpsaved[0];
 686
 687         if (test_thread_flag(TIF_32BIT)) {
 688                 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
 689
 690                 if (fprs & FPRS_DL)
 691                         memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
 692                                sizeof(unsigned int) * 32);
 693                 else
 694                         memset(&fpregs32->pr_fr.pr_regs[0], 0,
 695                                sizeof(unsigned int) * 32);
 696                 fpregs32->pr_qcnt = 0;
 697                 fpregs32->pr_q_entrysize = 8;
 698                 memset(&fpregs32->pr_q[0], 0,
 699                        (sizeof(unsigned int) * 64));
 700                 if (fprs & FPRS_FEF) {
 701                         fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
 702                         fpregs32->pr_en = 1;
 703                 } else {
 704                         fpregs32->pr_fsr = 0;
 705                         fpregs32->pr_en = 0;
 706                 }
 707         } else {
 708                 if(fprs & FPRS_DL)
 709                         memcpy(&fpregs->pr_regs[0], kfpregs,
 710                                sizeof(unsigned int) * 32);
 711                 else
 712                         memset(&fpregs->pr_regs[0], 0,
 713                                sizeof(unsigned int) * 32);
 714                 if(fprs & FPRS_DU)
 715                         memcpy(&fpregs->pr_regs[16], kfpregs+16,
 716                                sizeof(unsigned int) * 32);
 717                 else
 718                         memset(&fpregs->pr_regs[16], 0,
 719                                sizeof(unsigned int) * 32);
 720                 if(fprs & FPRS_FEF) {
 721                         fpregs->pr_fsr = current_thread_info()->xfsr[0];
 722                         fpregs->pr_gsr = current_thread_info()->gsr[0];
 723                 } else {
 724                         fpregs->pr_fsr = fpregs->pr_gsr = 0;
 725                 }
 726                 fpregs->pr_fprs = fprs;
 727         }
 728         return 1;
 729 }
 730 EXPORT_SYMBOL(dump_fpu);
 731
 732 unsigned long get_wchan(struct task_struct *task)
 733 {
 734         unsigned long pc, fp, bias = 0;
 735         struct thread_info *tp;
 736         struct reg_window *rw;
 737         unsigned long ret = 0;
 738         int count = 0;
 739
 740         if (!task || task == current ||
 741             task->state == TASK_RUNNING)
 742                 goto out;
 743
 744         tp = task_thread_info(task);
 745         bias = STACK_BIAS;
 746         fp = task_thread_info(task)->ksp + bias;
 747
 748         do {
 749                 if (!kstack_valid(tp, fp))
 750                         break;
 751                 rw = (struct reg_window *) fp;
 752                 pc = rw->ins[7];
 753                 if (!in_sched_functions(pc)) {
 754                         ret = pc;
 755                         goto out;
 756                 }
 757                 fp = rw->ins[6] + bias;
 758         } while (++count < 16);
 759
 760 out:
 761         return ret;
 762 }