arch/sparc/kernel/process_64.c

   1 /*  arch/sparc64/kernel/process.c
   2  *
   3  *  Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
   4  *  Copyright (C) 1996       Eddie C. Dost   (ecd@skynet.be)
   5  *  Copyright (C) 1997, 1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
   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 #include <linux/context_tracking.h>
  35
  36 #include <asm/uaccess.h>
  37 #include <asm/page.h>
  38 #include <asm/pgalloc.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/processor.h>
  41 #include <asm/pstate.h>
  42 #include <asm/elf.h>
  43 #include <asm/fpumacro.h>
  44 #include <asm/head.h>
  45 #include <asm/cpudata.h>
  46 #include <asm/mmu_context.h>
  47 #include <asm/unistd.h>
  48 #include <asm/hypervisor.h>
  49 #include <asm/syscalls.h>
  50 #include <asm/irq_regs.h>
  51 #include <asm/smp.h>
  52 #include <asm/pcr.h>
  53
  54 #include "kstack.h"
  55
  56 /* Idle loop support on sparc64. */
  57 void arch_cpu_idle(void)
  58 {
  59         if (tlb_type != hypervisor) {
  60                 touch_nmi_watchdog();
  61                 local_irq_enable();
  62         } else {
  63                 unsigned long pstate;
  64
  65                 local_irq_enable();
  66
  67                 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
  68                  * the cpu sleep hypervisor call.
  69                  */
  70                 __asm__ __volatile__(
  71                         "rdpr %%pstate, %0\n\t"
  72                         "andn %0, %1, %0\n\t"
  73                         "wrpr %0, %%g0, %%pstate"
  74                         : "=&r" (pstate)
  75                         : "i" (PSTATE_IE));
  76
  77                 if (!need_resched() && !cpu_is_offline(smp_processor_id()))
  78                         sun4v_cpu_yield();
  79
  80                 /* Re-enable interrupts. */
  81                 __asm__ __volatile__(
  82                         "rdpr %%pstate, %0\n\t"
  83                         "or %0, %1, %0\n\t"
  84                         "wrpr %0, %%g0, %%pstate"
  85                         : "=&r" (pstate)
  86                         : "i" (PSTATE_IE));
  87         }
  88 }
  89
  90 #ifdef CONFIG_HOTPLUG_CPU
  91 void arch_cpu_idle_dead(void)
  92 {
  93         sched_preempt_enable_no_resched();
  94         cpu_play_dead();
  95 }
  96 #endif
  97
  98 #ifdef CONFIG_COMPAT
  99 static void show_regwindow32(struct pt_regs *regs)
 100 {
 101         struct reg_window32 __user *rw;
 102         struct reg_window32 r_w;
 103         mm_segment_t old_fs;
 104
 105         __asm__ __volatile__ ("flushw");
 106         rw = compat_ptr((unsigned)regs->u_regs[14]);
 107         old_fs = get_fs();
 108         set_fs (USER_DS);
 109         if (copy_from_user (&r_w, rw, sizeof(r_w))) {
 110                 set_fs (old_fs);
 111                 return;
 112         }
 113
 114         set_fs (old_fs);
 115         printk("l0: %08x l1: %08x l2: %08x l3: %08x "
 116                "l4: %08x l5: %08x l6: %08x l7: %08x\n",
 117                r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
 118                r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
 119         printk("i0: %08x i1: %08x i2: %08x i3: %08x "
 120                "i4: %08x i5: %08x i6: %08x i7: %08x\n",
 121                r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
 122                r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
 123 }
 124 #else
 125 #define show_regwindow32(regs)  do { } while (0)
 126 #endif
 127
 128 static void show_regwindow(struct pt_regs *regs)
 129 {
 130         struct reg_window __user *rw;
 131         struct reg_window *rwk;
 132         struct reg_window r_w;
 133         mm_segment_t old_fs;
 134
 135         if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
 136                 __asm__ __volatile__ ("flushw");
 137                 rw = (struct reg_window __user *)
 138                         (regs->u_regs[14] + STACK_BIAS);
 139                 rwk = (struct reg_window *)
 140                         (regs->u_regs[14] + STACK_BIAS);
 141                 if (!(regs->tstate & TSTATE_PRIV)) {
 142                         old_fs = get_fs();
 143                         set_fs (USER_DS);
 144                         if (copy_from_user (&r_w, rw, sizeof(r_w))) {
 145                                 set_fs (old_fs);
 146                                 return;
 147                         }
 148                         rwk = &r_w;
 149                         set_fs (old_fs);
 150                 }
 151         } else {
 152                 show_regwindow32(regs);
 153                 return;
 154         }
 155         printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
 156                rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
 157         printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
 158                rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
 159         printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
 160                rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
 161         printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
 162                rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
 163         if (regs->tstate & TSTATE_PRIV)
 164                 printk("I7: <%pS>\n", (void *) rwk->ins[7]);
 165 }
 166
 167 void show_regs(struct pt_regs *regs)
 168 {
 169         show_regs_print_info(KERN_DEFAULT);
 170
 171         printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x    %s\n", regs->tstate,
 172                regs->tpc, regs->tnpc, regs->y, print_tainted());
 173         printk("TPC: <%pS>\n", (void *) regs->tpc);
 174         printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
 175                regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
 176                regs->u_regs[3]);
 177         printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
 178                regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
 179                regs->u_regs[7]);
 180         printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
 181                regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
 182                regs->u_regs[11]);
 183         printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
 184                regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
 185                regs->u_regs[15]);
 186         printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
 187         show_regwindow(regs);
 188         show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
 189 }
 190
 191 union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
 192 static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
 193
 194 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
 195                               int this_cpu)
 196 {
 197         struct global_reg_snapshot *rp;
 198
 199         flushw_all();
 200
 201         rp = &global_cpu_snapshot[this_cpu].reg;
 202
 203         rp->tstate = regs->tstate;
 204         rp->tpc = regs->tpc;
 205         rp->tnpc = regs->tnpc;
 206         rp->o7 = regs->u_regs[UREG_I7];
 207
 208         if (regs->tstate & TSTATE_PRIV) {
 209                 struct reg_window *rw;
 210
 211                 rw = (struct reg_window *)
 212                         (regs->u_regs[UREG_FP] + STACK_BIAS);
 213                 if (kstack_valid(tp, (unsigned long) rw)) {
 214                         rp->i7 = rw->ins[7];
 215                         rw = (struct reg_window *)
 216                                 (rw->ins[6] + STACK_BIAS);
 217                         if (kstack_valid(tp, (unsigned long) rw))
 218                                 rp->rpc = rw->ins[7];
 219                 }
 220         } else {
 221                 rp->i7 = 0;
 222                 rp->rpc = 0;
 223         }
 224         rp->thread = tp;
 225 }
 226
 227 /* In order to avoid hangs we do not try to synchronize with the
 228  * global register dump client cpus.  The last store they make is to
 229  * the thread pointer, so do a short poll waiting for that to become
 230  * non-NULL.
 231  */
 232 static void __global_reg_poll(struct global_reg_snapshot *gp)
 233 {
 234         int limit = 0;
 235
 236         while (!gp->thread && ++limit < 100) {
 237                 barrier();
 238                 udelay(1);
 239         }
 240 }
 241
 242 void arch_trigger_all_cpu_backtrace(bool include_self)
 243 {
 244         struct thread_info *tp = current_thread_info();
 245         struct pt_regs *regs = get_irq_regs();
 246         unsigned long flags;
 247         int this_cpu, cpu;
 248
 249         if (!regs)
 250                 regs = tp->kregs;
 251
 252         spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
 253
 254         this_cpu = raw_smp_processor_id();
 255
 256         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 257
 258         if (include_self)
 259                 __global_reg_self(tp, regs, this_cpu);
 260
 261         smp_fetch_global_regs();
 262
 263         for_each_online_cpu(cpu) {
 264                 struct global_reg_snapshot *gp;
 265
 266                 if (!include_self && cpu == this_cpu)
 267                         continue;
 268
 269                 gp = &global_cpu_snapshot[cpu].reg;
 270
 271                 __global_reg_poll(gp);
 272
 273                 tp = gp->thread;
 274                 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
 275                        (cpu == this_cpu ? '*' : ' '), cpu,
 276                        gp->tstate, gp->tpc, gp->tnpc,
 277                        ((tp && tp->task) ? tp->task->comm : "NULL"),
 278                        ((tp && tp->task) ? tp->task->pid : -1));
 279
 280                 if (gp->tstate & TSTATE_PRIV) {
 281                         printk("             TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
 282                                (void *) gp->tpc,
 283                                (void *) gp->o7,
 284                                (void *) gp->i7,
 285                                (void *) gp->rpc);
 286                 } else {
 287                         printk("             TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
 288                                gp->tpc, gp->o7, gp->i7, gp->rpc);
 289                 }
 290         }
 291
 292         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 293
 294         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
 295 }
 296
 297 #ifdef CONFIG_MAGIC_SYSRQ
 298
 299 static void sysrq_handle_globreg(int key)
 300 {
 301         arch_trigger_all_cpu_backtrace(true);
 302 }
 303
 304 static struct sysrq_key_op sparc_globalreg_op = {
 305         .handler        = sysrq_handle_globreg,
 306         .help_msg       = "global-regs(y)",
 307         .action_msg     = "Show Global CPU Regs",
 308 };
 309
 310 static void __global_pmu_self(int this_cpu)
 311 {
 312         struct global_pmu_snapshot *pp;
 313         int i, num;
 314
 315         if (!pcr_ops)
 316                 return;
 317
 318         pp = &global_cpu_snapshot[this_cpu].pmu;
 319
 320         num = 1;
 321         if (tlb_type == hypervisor &&
 322             sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
 323                 num = 4;
 324
 325         for (i = 0; i < num; i++) {
 326                 pp->pcr[i] = pcr_ops->read_pcr(i);
 327                 pp->pic[i] = pcr_ops->read_pic(i);
 328         }
 329 }
 330
 331 static void __global_pmu_poll(struct global_pmu_snapshot *pp)
 332 {
 333         int limit = 0;
 334
 335         while (!pp->pcr[0] && ++limit < 100) {
 336                 barrier();
 337                 udelay(1);
 338         }
 339 }
 340
 341 static void pmu_snapshot_all_cpus(void)
 342 {
 343         unsigned long flags;
 344         int this_cpu, cpu;
 345
 346         spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
 347
 348         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 349
 350         this_cpu = raw_smp_processor_id();
 351
 352         __global_pmu_self(this_cpu);
 353
 354         smp_fetch_global_pmu();
 355
 356         for_each_online_cpu(cpu) {
 357                 struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
 358
 359                 __global_pmu_poll(pp);
 360
 361                 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
 362                        (cpu == this_cpu ? '*' : ' '), cpu,
 363                        pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
 364                        pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
 365         }
 366
 367         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 368
 369         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
 370 }
 371
 372 static void sysrq_handle_globpmu(int key)
 373 {
 374         pmu_snapshot_all_cpus();
 375 }
 376
 377 static struct sysrq_key_op sparc_globalpmu_op = {
 378         .handler        = sysrq_handle_globpmu,
 379         .help_msg       = "global-pmu(x)",
 380         .action_msg     = "Show Global PMU Regs",
 381 };
 382
 383 static int __init sparc_sysrq_init(void)
 384 {
 385         int ret = register_sysrq_key('y', &sparc_globalreg_op);
 386
 387         if (!ret)
 388                 ret = register_sysrq_key('x', &sparc_globalpmu_op);
 389         return ret;
 390 }
 391
 392 core_initcall(sparc_sysrq_init);
 393
 394 #endif
 395
 396 unsigned long thread_saved_pc(struct task_struct *tsk)
 397 {
 398         struct thread_info *ti = task_thread_info(tsk);
 399         unsigned long ret = 0xdeadbeefUL;
 400
 401         if (ti && ti->ksp) {
 402                 unsigned long *sp;
 403                 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
 404                 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
 405                     sp[14]) {
 406                         unsigned long *fp;
 407                         fp = (unsigned long *)(sp[14] + STACK_BIAS);
 408                         if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
 409                                 ret = fp[15];
 410                 }
 411         }
 412         return ret;
 413 }
 414
 415 /* Free current thread data structures etc.. */
 416 void exit_thread(void)
 417 {
 418         struct thread_info *t = current_thread_info();
 419
 420         if (t->utraps) {
 421                 if (t->utraps[0] < 2)
 422                         kfree (t->utraps);
 423                 else
 424                         t->utraps[0]--;
 425         }
 426 }
 427
 428 void flush_thread(void)
 429 {
 430         struct thread_info *t = current_thread_info();
 431         struct mm_struct *mm;
 432
 433         mm = t->task->mm;
 434         if (mm)
 435                 tsb_context_switch(mm);
 436
 437         set_thread_wsaved(0);
 438
 439         /* Clear FPU register state. */
 440         t->fpsaved[0] = 0;
 441 }
 442
 443 /* It's a bit more tricky when 64-bit tasks are involved... */
 444 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
 445 {
 446         bool stack_64bit = test_thread_64bit_stack(psp);
 447         unsigned long fp, distance, rval;
 448
 449         if (stack_64bit) {
 450                 csp += STACK_BIAS;
 451                 psp += STACK_BIAS;
 452                 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
 453                 fp += STACK_BIAS;
 454                 if (test_thread_flag(TIF_32BIT))
 455                         fp &= 0xffffffff;
 456         } else
 457                 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
 458
 459         /* Now align the stack as this is mandatory in the Sparc ABI
 460          * due to how register windows work.  This hides the
 461          * restriction from thread libraries etc.
 462          */
 463         csp &= ~15UL;
 464
 465         distance = fp - psp;
 466         rval = (csp - distance);
 467         if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
 468                 rval = 0;
 469         else if (!stack_64bit) {
 470                 if (put_user(((u32)csp),
 471                              &(((struct reg_window32 __user *)rval)->ins[6])))
 472                         rval = 0;
 473         } else {
 474                 if (put_user(((u64)csp - STACK_BIAS),
 475                              &(((struct reg_window __user *)rval)->ins[6])))
 476                         rval = 0;
 477                 else
 478                         rval = rval - STACK_BIAS;
 479         }
 480
 481         return rval;
 482 }
 483
 484 /* Standard stuff. */
 485 static inline void shift_window_buffer(int first_win, int last_win,
 486                                        struct thread_info *t)
 487 {
 488         int i;
 489
 490         for (i = first_win; i < last_win; i++) {
 491                 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
 492                 memcpy(&t->reg_window[i], &t->reg_window[i+1],
 493                        sizeof(struct reg_window));
 494         }
 495 }
 496
 497 void synchronize_user_stack(void)
 498 {
 499         struct thread_info *t = current_thread_info();
 500         unsigned long window;
 501
 502         flush_user_windows();
 503         if ((window = get_thread_wsaved()) != 0) {
 504                 window -= 1;
 505                 do {
 506                         struct reg_window *rwin = &t->reg_window[window];
 507                         int winsize = sizeof(struct reg_window);
 508                         unsigned long sp;
 509
 510                         sp = t->rwbuf_stkptrs[window];
 511
 512                         if (test_thread_64bit_stack(sp))
 513                                 sp += STACK_BIAS;
 514                         else
 515                                 winsize = sizeof(struct reg_window32);
 516
 517                         if (!copy_to_user((char __user *)sp, rwin, winsize)) {
 518                                 shift_window_buffer(window, get_thread_wsaved() - 1, t);
 519                                 set_thread_wsaved(get_thread_wsaved() - 1);
 520                         }
 521                 } while (window--);
 522         }
 523 }
 524
 525 static void stack_unaligned(unsigned long sp)
 526 {
 527         siginfo_t info;
 528
 529         info.si_signo = SIGBUS;
 530         info.si_errno = 0;
 531         info.si_code = BUS_ADRALN;
 532         info.si_addr = (void __user *) sp;
 533         info.si_trapno = 0;
 534         force_sig_info(SIGBUS, &info, current);
 535 }
 536
 537 void fault_in_user_windows(void)
 538 {
 539         struct thread_info *t = current_thread_info();
 540         unsigned long window;
 541
 542         flush_user_windows();
 543         window = get_thread_wsaved();
 544
 545         if (likely(window != 0)) {
 546                 window -= 1;
 547                 do {
 548                         struct reg_window *rwin = &t->reg_window[window];
 549                         int winsize = sizeof(struct reg_window);
 550                         unsigned long sp;
 551
 552                         sp = t->rwbuf_stkptrs[window];
 553
 554                         if (test_thread_64bit_stack(sp))
 555                                 sp += STACK_BIAS;
 556                         else
 557                                 winsize = sizeof(struct reg_window32);
 558
 559                         if (unlikely(sp & 0x7UL))
 560                                 stack_unaligned(sp);
 561
 562                         if (unlikely(copy_to_user((char __user *)sp,
 563                                                   rwin, winsize)))
 564                                 goto barf;
 565                 } while (window--);
 566         }
 567         set_thread_wsaved(0);
 568         return;
 569
 570 barf:
 571         set_thread_wsaved(window + 1);
 572         user_exit();
 573         do_exit(SIGILL);
 574 }
 575
 576 asmlinkage long sparc_do_fork(unsigned long clone_flags,
 577                               unsigned long stack_start,
 578                               struct pt_regs *regs,
 579                               unsigned long stack_size)
 580 {
 581         int __user *parent_tid_ptr, *child_tid_ptr;
 582         unsigned long orig_i1 = regs->u_regs[UREG_I1];
 583         long ret;
 584
 585 #ifdef CONFIG_COMPAT
 586         if (test_thread_flag(TIF_32BIT)) {
 587                 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
 588                 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
 589         } else
 590 #endif
 591         {
 592                 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
 593                 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
 594         }
 595
 596         ret = do_fork(clone_flags, stack_start, stack_size,
 597                       parent_tid_ptr, child_tid_ptr);
 598
 599         /* If we get an error and potentially restart the system
 600          * call, we're screwed because copy_thread() clobbered
 601          * the parent's %o1.  So detect that case and restore it
 602          * here.
 603          */
 604         if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
 605                 regs->u_regs[UREG_I1] = orig_i1;
 606
 607         return ret;
 608 }
 609
 610 /* Copy a Sparc thread.  The fork() return value conventions
 611  * under SunOS are nothing short of bletcherous:
 612  * Parent -->  %o0 == childs  pid, %o1 == 0
 613  * Child  -->  %o0 == parents pid, %o1 == 1
 614  */
 615 int copy_thread(unsigned long clone_flags, unsigned long sp,
 616                 unsigned long arg, struct task_struct *p)
 617 {
 618         struct thread_info *t = task_thread_info(p);
 619         struct pt_regs *regs = current_pt_regs();
 620         struct sparc_stackf *parent_sf;
 621         unsigned long child_stack_sz;
 622         char *child_trap_frame;
 623
 624         /* Calculate offset to stack_frame & pt_regs */
 625         child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
 626         child_trap_frame = (task_stack_page(p) +
 627                             (THREAD_SIZE - child_stack_sz));
 628
 629         t->new_child = 1;
 630         t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
 631         t->kregs = (struct pt_regs *) (child_trap_frame +
 632                                        sizeof(struct sparc_stackf));
 633         t->fpsaved[0] = 0;
 634
 635         if (unlikely(p->flags & PF_KTHREAD)) {
 636                 memset(child_trap_frame, 0, child_stack_sz);
 637                 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
 638                         (current_pt_regs()->tstate + 1) & TSTATE_CWP;
 639                 t->current_ds = ASI_P;
 640                 t->kregs->u_regs[UREG_G1] = sp; /* function */
 641                 t->kregs->u_regs[UREG_G2] = arg;
 642                 return 0;
 643         }
 644
 645         parent_sf = ((struct sparc_stackf *) regs) - 1;
 646         memcpy(child_trap_frame, parent_sf, child_stack_sz);
 647         if (t->flags & _TIF_32BIT) {
 648                 sp &= 0x00000000ffffffffUL;
 649                 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
 650         }
 651         t->kregs->u_regs[UREG_FP] = sp;
 652         __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
 653                 (regs->tstate + 1) & TSTATE_CWP;
 654         t->current_ds = ASI_AIUS;
 655         if (sp != regs->u_regs[UREG_FP]) {
 656                 unsigned long csp;
 657
 658                 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
 659                 if (!csp)
 660                         return -EFAULT;
 661                 t->kregs->u_regs[UREG_FP] = csp;
 662         }
 663         if (t->utraps)
 664                 t->utraps[0]++;
 665
 666         /* Set the return value for the child. */
 667         t->kregs->u_regs[UREG_I0] = current->pid;
 668         t->kregs->u_regs[UREG_I1] = 1;
 669
 670         /* Set the second return value for the parent. */
 671         regs->u_regs[UREG_I1] = 0;
 672
 673         if (clone_flags & CLONE_SETTLS)
 674                 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
 675
 676         return 0;
 677 }
 678
 679 typedef struct {
 680         union {
 681                 unsigned int    pr_regs[32];
 682                 unsigned long   pr_dregs[16];
 683         } pr_fr;
 684         unsigned int __unused;
 685         unsigned int    pr_fsr;
 686         unsigned char   pr_qcnt;
 687         unsigned char   pr_q_entrysize;
 688         unsigned char   pr_en;
 689         unsigned int    pr_q[64];
 690 } elf_fpregset_t32;
 691
 692 /*
 693  * fill in the fpu structure for a core dump.
 694  */
 695 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
 696 {
 697         unsigned long *kfpregs = current_thread_info()->fpregs;
 698         unsigned long fprs = current_thread_info()->fpsaved[0];
 699
 700         if (test_thread_flag(TIF_32BIT)) {
 701                 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
 702
 703                 if (fprs & FPRS_DL)
 704                         memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
 705                                sizeof(unsigned int) * 32);
 706                 else
 707                         memset(&fpregs32->pr_fr.pr_regs[0], 0,
 708                                sizeof(unsigned int) * 32);
 709                 fpregs32->pr_qcnt = 0;
 710                 fpregs32->pr_q_entrysize = 8;
 711                 memset(&fpregs32->pr_q[0], 0,
 712                        (sizeof(unsigned int) * 64));
 713                 if (fprs & FPRS_FEF) {
 714                         fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
 715                         fpregs32->pr_en = 1;
 716                 } else {
 717                         fpregs32->pr_fsr = 0;
 718                         fpregs32->pr_en = 0;
 719                 }
 720         } else {
 721                 if(fprs & FPRS_DL)
 722                         memcpy(&fpregs->pr_regs[0], kfpregs,
 723                                sizeof(unsigned int) * 32);
 724                 else
 725                         memset(&fpregs->pr_regs[0], 0,
 726                                sizeof(unsigned int) * 32);
 727                 if(fprs & FPRS_DU)
 728                         memcpy(&fpregs->pr_regs[16], kfpregs+16,
 729                                sizeof(unsigned int) * 32);
 730                 else
 731                         memset(&fpregs->pr_regs[16], 0,
 732                                sizeof(unsigned int) * 32);
 733                 if(fprs & FPRS_FEF) {
 734                         fpregs->pr_fsr = current_thread_info()->xfsr[0];
 735                         fpregs->pr_gsr = current_thread_info()->gsr[0];
 736                 } else {
 737                         fpregs->pr_fsr = fpregs->pr_gsr = 0;
 738                 }
 739                 fpregs->pr_fprs = fprs;
 740         }
 741         return 1;
 742 }
 743 EXPORT_SYMBOL(dump_fpu);
 744
 745 unsigned long get_wchan(struct task_struct *task)
 746 {
 747         unsigned long pc, fp, bias = 0;
 748         struct thread_info *tp;
 749         struct reg_window *rw;
 750         unsigned long ret = 0;
 751         int count = 0;
 752
 753         if (!task || task == current ||
 754             task->state == TASK_RUNNING)
 755                 goto out;
 756
 757         tp = task_thread_info(task);
 758         bias = STACK_BIAS;
 759         fp = task_thread_info(task)->ksp + bias;
 760
 761         do {
 762                 if (!kstack_valid(tp, fp))
 763                         break;
 764                 rw = (struct reg_window *) fp;
 765                 pc = rw->ins[7];
 766                 if (!in_sched_functions(pc)) {
 767                         ret = pc;
 768                         goto out;
 769                 }
 770                 fp = rw->ins[6] + bias;
 771         } while (++count < 16);
 772
 773 out:
 774         return ret;
 775 }