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 #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()
  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(void)
 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         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 255
 256         this_cpu = raw_smp_processor_id();
 257
 258         __global_reg_self(tp, regs, this_cpu);
 259
 260         smp_fetch_global_regs();
 261
 262         for_each_online_cpu(cpu) {
 263                 struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg;
 264
 265                 __global_reg_poll(gp);
 266
 267                 tp = gp->thread;
 268                 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
 269                        (cpu == this_cpu ? '*' : ' '), cpu,
 270                        gp->tstate, gp->tpc, gp->tnpc,
 271                        ((tp && tp->task) ? tp->task->comm : "NULL"),
 272                        ((tp && tp->task) ? tp->task->pid : -1));
 273
 274                 if (gp->tstate & TSTATE_PRIV) {
 275                         printk("             TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
 276                                (void *) gp->tpc,
 277                                (void *) gp->o7,
 278                                (void *) gp->i7,
 279                                (void *) gp->rpc);
 280                 } else {
 281                         printk("             TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
 282                                gp->tpc, gp->o7, gp->i7, gp->rpc);
 283                 }
 284         }
 285
 286         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 287
 288         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
 289 }
 290
 291 #ifdef CONFIG_MAGIC_SYSRQ
 292
 293 static void sysrq_handle_globreg(int key)
 294 {
 295         arch_trigger_all_cpu_backtrace();
 296 }
 297
 298 static struct sysrq_key_op sparc_globalreg_op = {
 299         .handler        = sysrq_handle_globreg,
 300         .help_msg       = "global-regs(y)",
 301         .action_msg     = "Show Global CPU Regs",
 302 };
 303
 304 static void __global_pmu_self(int this_cpu)
 305 {
 306         struct global_pmu_snapshot *pp;
 307         int i, num;
 308
 309         pp = &global_cpu_snapshot[this_cpu].pmu;
 310
 311         num = 1;
 312         if (tlb_type == hypervisor &&
 313             sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
 314                 num = 4;
 315
 316         for (i = 0; i < num; i++) {
 317                 pp->pcr[i] = pcr_ops->read_pcr(i);
 318                 pp->pic[i] = pcr_ops->read_pic(i);
 319         }
 320 }
 321
 322 static void __global_pmu_poll(struct global_pmu_snapshot *pp)
 323 {
 324         int limit = 0;
 325
 326         while (!pp->pcr[0] && ++limit < 100) {
 327                 barrier();
 328                 udelay(1);
 329         }
 330 }
 331
 332 static void pmu_snapshot_all_cpus(void)
 333 {
 334         unsigned long flags;
 335         int this_cpu, cpu;
 336
 337         spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
 338
 339         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 340
 341         this_cpu = raw_smp_processor_id();
 342
 343         __global_pmu_self(this_cpu);
 344
 345         smp_fetch_global_pmu();
 346
 347         for_each_online_cpu(cpu) {
 348                 struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
 349
 350                 __global_pmu_poll(pp);
 351
 352                 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
 353                        (cpu == this_cpu ? '*' : ' '), cpu,
 354                        pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
 355                        pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
 356         }
 357
 358         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 359
 360         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
 361 }
 362
 363 static void sysrq_handle_globpmu(int key)
 364 {
 365         pmu_snapshot_all_cpus();
 366 }
 367
 368 static struct sysrq_key_op sparc_globalpmu_op = {
 369         .handler        = sysrq_handle_globpmu,
 370         .help_msg       = "global-pmu(x)",
 371         .action_msg     = "Show Global PMU Regs",
 372 };
 373
 374 static int __init sparc_sysrq_init(void)
 375 {
 376         int ret = register_sysrq_key('y', &sparc_globalreg_op);
 377
 378         if (!ret)
 379                 ret = register_sysrq_key('x', &sparc_globalpmu_op);
 380         return ret;
 381 }
 382
 383 core_initcall(sparc_sysrq_init);
 384
 385 #endif
 386
 387 unsigned long thread_saved_pc(struct task_struct *tsk)
 388 {
 389         struct thread_info *ti = task_thread_info(tsk);
 390         unsigned long ret = 0xdeadbeefUL;
 391
 392         if (ti && ti->ksp) {
 393                 unsigned long *sp;
 394                 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
 395                 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
 396                     sp[14]) {
 397                         unsigned long *fp;
 398                         fp = (unsigned long *)(sp[14] + STACK_BIAS);
 399                         if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
 400                                 ret = fp[15];
 401                 }
 402         }
 403         return ret;
 404 }
 405
 406 /* Free current thread data structures etc.. */
 407 void exit_thread(void)
 408 {
 409         struct thread_info *t = current_thread_info();
 410
 411         if (t->utraps) {
 412                 if (t->utraps[0] < 2)
 413                         kfree (t->utraps);
 414                 else
 415                         t->utraps[0]--;
 416         }
 417 }
 418
 419 void flush_thread(void)
 420 {
 421         struct thread_info *t = current_thread_info();
 422         struct mm_struct *mm;
 423
 424         mm = t->task->mm;
 425         if (mm)
 426                 tsb_context_switch(mm);
 427
 428         set_thread_wsaved(0);
 429
 430         /* Clear FPU register state. */
 431         t->fpsaved[0] = 0;
 432 }
 433
 434 /* It's a bit more tricky when 64-bit tasks are involved... */
 435 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
 436 {
 437         bool stack_64bit = test_thread_64bit_stack(psp);
 438         unsigned long fp, distance, rval;
 439
 440         if (stack_64bit) {
 441                 csp += STACK_BIAS;
 442                 psp += STACK_BIAS;
 443                 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
 444                 fp += STACK_BIAS;
 445                 if (test_thread_flag(TIF_32BIT))
 446                         fp &= 0xffffffff;
 447         } else
 448                 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
 449
 450         /* Now align the stack as this is mandatory in the Sparc ABI
 451          * due to how register windows work.  This hides the
 452          * restriction from thread libraries etc.
 453          */
 454         csp &= ~15UL;
 455
 456         distance = fp - psp;
 457         rval = (csp - distance);
 458         if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
 459                 rval = 0;
 460         else if (!stack_64bit) {
 461                 if (put_user(((u32)csp),
 462                              &(((struct reg_window32 __user *)rval)->ins[6])))
 463                         rval = 0;
 464         } else {
 465                 if (put_user(((u64)csp - STACK_BIAS),
 466                              &(((struct reg_window __user *)rval)->ins[6])))
 467                         rval = 0;
 468                 else
 469                         rval = rval - STACK_BIAS;
 470         }
 471
 472         return rval;
 473 }
 474
 475 /* Standard stuff. */
 476 static inline void shift_window_buffer(int first_win, int last_win,
 477                                        struct thread_info *t)
 478 {
 479         int i;
 480
 481         for (i = first_win; i < last_win; i++) {
 482                 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
 483                 memcpy(&t->reg_window[i], &t->reg_window[i+1],
 484                        sizeof(struct reg_window));
 485         }
 486 }
 487
 488 void synchronize_user_stack(void)
 489 {
 490         struct thread_info *t = current_thread_info();
 491         unsigned long window;
 492
 493         flush_user_windows();
 494         if ((window = get_thread_wsaved()) != 0) {
 495                 window -= 1;
 496                 do {
 497                         struct reg_window *rwin = &t->reg_window[window];
 498                         int winsize = sizeof(struct reg_window);
 499                         unsigned long sp;
 500
 501                         sp = t->rwbuf_stkptrs[window];
 502
 503                         if (test_thread_64bit_stack(sp))
 504                                 sp += STACK_BIAS;
 505                         else
 506                                 winsize = sizeof(struct reg_window32);
 507
 508                         if (!copy_to_user((char __user *)sp, rwin, winsize)) {
 509                                 shift_window_buffer(window, get_thread_wsaved() - 1, t);
 510                                 set_thread_wsaved(get_thread_wsaved() - 1);
 511                         }
 512                 } while (window--);
 513         }
 514 }
 515
 516 static void stack_unaligned(unsigned long sp)
 517 {
 518         siginfo_t info;
 519
 520         info.si_signo = SIGBUS;
 521         info.si_errno = 0;
 522         info.si_code = BUS_ADRALN;
 523         info.si_addr = (void __user *) sp;
 524         info.si_trapno = 0;
 525         force_sig_info(SIGBUS, &info, current);
 526 }
 527
 528 void fault_in_user_windows(void)
 529 {
 530         struct thread_info *t = current_thread_info();
 531         unsigned long window;
 532
 533         flush_user_windows();
 534         window = get_thread_wsaved();
 535
 536         if (likely(window != 0)) {
 537                 window -= 1;
 538                 do {
 539                         struct reg_window *rwin = &t->reg_window[window];
 540                         int winsize = sizeof(struct reg_window);
 541                         unsigned long sp;
 542
 543                         sp = t->rwbuf_stkptrs[window];
 544
 545                         if (test_thread_64bit_stack(sp))
 546                                 sp += STACK_BIAS;
 547                         else
 548                                 winsize = sizeof(struct reg_window32);
 549
 550                         if (unlikely(sp & 0x7UL))
 551                                 stack_unaligned(sp);
 552
 553                         if (unlikely(copy_to_user((char __user *)sp,
 554                                                   rwin, winsize)))
 555                                 goto barf;
 556                 } while (window--);
 557         }
 558         set_thread_wsaved(0);
 559         return;
 560
 561 barf:
 562         set_thread_wsaved(window + 1);
 563         user_exit();
 564         do_exit(SIGILL);
 565 }
 566
 567 asmlinkage long sparc_do_fork(unsigned long clone_flags,
 568                               unsigned long stack_start,
 569                               struct pt_regs *regs,
 570                               unsigned long stack_size)
 571 {
 572         int __user *parent_tid_ptr, *child_tid_ptr;
 573         unsigned long orig_i1 = regs->u_regs[UREG_I1];
 574         long ret;
 575
 576 #ifdef CONFIG_COMPAT
 577         if (test_thread_flag(TIF_32BIT)) {
 578                 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
 579                 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
 580         } else
 581 #endif
 582         {
 583                 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
 584                 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
 585         }
 586
 587         ret = do_fork(clone_flags, stack_start, stack_size,
 588                       parent_tid_ptr, child_tid_ptr);
 589
 590         /* If we get an error and potentially restart the system
 591          * call, we're screwed because copy_thread() clobbered
 592          * the parent's %o1.  So detect that case and restore it
 593          * here.
 594          */
 595         if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
 596                 regs->u_regs[UREG_I1] = orig_i1;
 597
 598         return ret;
 599 }
 600
 601 /* Copy a Sparc thread.  The fork() return value conventions
 602  * under SunOS are nothing short of bletcherous:
 603  * Parent -->  %o0 == childs  pid, %o1 == 0
 604  * Child  -->  %o0 == parents pid, %o1 == 1
 605  */
 606 int copy_thread(unsigned long clone_flags, unsigned long sp,
 607                 unsigned long arg, struct task_struct *p)
 608 {
 609         struct thread_info *t = task_thread_info(p);
 610         struct pt_regs *regs = current_pt_regs();
 611         struct sparc_stackf *parent_sf;
 612         unsigned long child_stack_sz;
 613         char *child_trap_frame;
 614
 615         /* Calculate offset to stack_frame & pt_regs */
 616         child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
 617         child_trap_frame = (task_stack_page(p) +
 618                             (THREAD_SIZE - child_stack_sz));
 619
 620         t->new_child = 1;
 621         t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
 622         t->kregs = (struct pt_regs *) (child_trap_frame +
 623                                        sizeof(struct sparc_stackf));
 624         t->fpsaved[0] = 0;
 625
 626         if (unlikely(p->flags & PF_KTHREAD)) {
 627                 memset(child_trap_frame, 0, child_stack_sz);
 628                 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
 629                         (current_pt_regs()->tstate + 1) & TSTATE_CWP;
 630                 t->current_ds = ASI_P;
 631                 t->kregs->u_regs[UREG_G1] = sp; /* function */
 632                 t->kregs->u_regs[UREG_G2] = arg;
 633                 return 0;
 634         }
 635
 636         parent_sf = ((struct sparc_stackf *) regs) - 1;
 637         memcpy(child_trap_frame, parent_sf, child_stack_sz);
 638         if (t->flags & _TIF_32BIT) {
 639                 sp &= 0x00000000ffffffffUL;
 640                 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
 641         }
 642         t->kregs->u_regs[UREG_FP] = sp;
 643         __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
 644                 (regs->tstate + 1) & TSTATE_CWP;
 645         t->current_ds = ASI_AIUS;
 646         if (sp != regs->u_regs[UREG_FP]) {
 647                 unsigned long csp;
 648
 649                 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
 650                 if (!csp)
 651                         return -EFAULT;
 652                 t->kregs->u_regs[UREG_FP] = csp;
 653         }
 654         if (t->utraps)
 655                 t->utraps[0]++;
 656
 657         /* Set the return value for the child. */
 658         t->kregs->u_regs[UREG_I0] = current->pid;
 659         t->kregs->u_regs[UREG_I1] = 1;
 660
 661         /* Set the second return value for the parent. */
 662         regs->u_regs[UREG_I1] = 0;
 663
 664         if (clone_flags & CLONE_SETTLS)
 665                 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
 666
 667         return 0;
 668 }
 669
 670 typedef struct {
 671         union {
 672                 unsigned int    pr_regs[32];
 673                 unsigned long   pr_dregs[16];
 674         } pr_fr;
 675         unsigned int __unused;
 676         unsigned int    pr_fsr;
 677         unsigned char   pr_qcnt;
 678         unsigned char   pr_q_entrysize;
 679         unsigned char   pr_en;
 680         unsigned int    pr_q[64];
 681 } elf_fpregset_t32;
 682
 683 /*
 684  * fill in the fpu structure for a core dump.
 685  */
 686 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
 687 {
 688         unsigned long *kfpregs = current_thread_info()->fpregs;
 689         unsigned long fprs = current_thread_info()->fpsaved[0];
 690
 691         if (test_thread_flag(TIF_32BIT)) {
 692                 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
 693
 694                 if (fprs & FPRS_DL)
 695                         memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
 696                                sizeof(unsigned int) * 32);
 697                 else
 698                         memset(&fpregs32->pr_fr.pr_regs[0], 0,
 699                                sizeof(unsigned int) * 32);
 700                 fpregs32->pr_qcnt = 0;
 701                 fpregs32->pr_q_entrysize = 8;
 702                 memset(&fpregs32->pr_q[0], 0,
 703                        (sizeof(unsigned int) * 64));
 704                 if (fprs & FPRS_FEF) {
 705                         fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
 706                         fpregs32->pr_en = 1;
 707                 } else {
 708                         fpregs32->pr_fsr = 0;
 709                         fpregs32->pr_en = 0;
 710                 }
 711         } else {
 712                 if(fprs & FPRS_DL)
 713                         memcpy(&fpregs->pr_regs[0], kfpregs,
 714                                sizeof(unsigned int) * 32);
 715                 else
 716                         memset(&fpregs->pr_regs[0], 0,
 717                                sizeof(unsigned int) * 32);
 718                 if(fprs & FPRS_DU)
 719                         memcpy(&fpregs->pr_regs[16], kfpregs+16,
 720                                sizeof(unsigned int) * 32);
 721                 else
 722                         memset(&fpregs->pr_regs[16], 0,
 723                                sizeof(unsigned int) * 32);
 724                 if(fprs & FPRS_FEF) {
 725                         fpregs->pr_fsr = current_thread_info()->xfsr[0];
 726                         fpregs->pr_gsr = current_thread_info()->gsr[0];
 727                 } else {
 728                         fpregs->pr_fsr = fpregs->pr_gsr = 0;
 729                 }
 730                 fpregs->pr_fprs = fprs;
 731         }
 732         return 1;
 733 }
 734 EXPORT_SYMBOL(dump_fpu);
 735
 736 unsigned long get_wchan(struct task_struct *task)
 737 {
 738         unsigned long pc, fp, bias = 0;
 739         struct thread_info *tp;
 740         struct reg_window *rw;
 741         unsigned long ret = 0;
 742         int count = 0;
 743
 744         if (!task || task == current ||
 745             task->state == TASK_RUNNING)
 746                 goto out;
 747
 748         tp = task_thread_info(task);
 749         bias = STACK_BIAS;
 750         fp = task_thread_info(task)->ksp + bias;
 751
 752         do {
 753                 if (!kstack_valid(tp, fp))
 754                         break;
 755                 rw = (struct reg_window *) fp;
 756                 pc = rw->ins[7];
 757                 if (!in_sched_functions(pc)) {
 758                         ret = pc;
 759                         goto out;
 760                 }
 761                 fp = rw->ins[6] + bias;
 762         } while (++count < 16);
 763
 764 out:
 765         return ret;
 766 }