Pileus Git - ~andy/linux/blob - 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
  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         printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x    %s\n", regs->tstate,
 167                regs->tpc, regs->tnpc, regs->y, print_tainted());
 168         printk("TPC: <%pS>\n", (void *) regs->tpc);
 169         printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
 170                regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
 171                regs->u_regs[3]);
 172         printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
 173                regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
 174                regs->u_regs[7]);
 175         printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
 176                regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
 177                regs->u_regs[11]);
 178         printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
 179                regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
 180                regs->u_regs[15]);
 181         printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
 182         show_regwindow(regs);
 183         show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
 184 }
 185
 186 union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
 187 static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
 188
 189 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
 190                               int this_cpu)
 191 {
 192         struct global_reg_snapshot *rp;
 193
 194         flushw_all();
 195
 196         rp = &global_cpu_snapshot[this_cpu].reg;
 197
 198         rp->tstate = regs->tstate;
 199         rp->tpc = regs->tpc;
 200         rp->tnpc = regs->tnpc;
 201         rp->o7 = regs->u_regs[UREG_I7];
 202
 203         if (regs->tstate & TSTATE_PRIV) {
 204                 struct reg_window *rw;
 205
 206                 rw = (struct reg_window *)
 207                         (regs->u_regs[UREG_FP] + STACK_BIAS);
 208                 if (kstack_valid(tp, (unsigned long) rw)) {
 209                         rp->i7 = rw->ins[7];
 210                         rw = (struct reg_window *)
 211                                 (rw->ins[6] + STACK_BIAS);
 212                         if (kstack_valid(tp, (unsigned long) rw))
 213                                 rp->rpc = rw->ins[7];
 214                 }
 215         } else {
 216                 rp->i7 = 0;
 217                 rp->rpc = 0;
 218         }
 219         rp->thread = tp;
 220 }
 221
 222 /* In order to avoid hangs we do not try to synchronize with the
 223  * global register dump client cpus.  The last store they make is to
 224  * the thread pointer, so do a short poll waiting for that to become
 225  * non-NULL.
 226  */
 227 static void __global_reg_poll(struct global_reg_snapshot *gp)
 228 {
 229         int limit = 0;
 230
 231         while (!gp->thread && ++limit < 100) {
 232                 barrier();
 233                 udelay(1);
 234         }
 235 }
 236
 237 void arch_trigger_all_cpu_backtrace(void)
 238 {
 239         struct thread_info *tp = current_thread_info();
 240         struct pt_regs *regs = get_irq_regs();
 241         unsigned long flags;
 242         int this_cpu, cpu;
 243
 244         if (!regs)
 245                 regs = tp->kregs;
 246
 247         spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
 248
 249         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 250
 251         this_cpu = raw_smp_processor_id();
 252
 253         __global_reg_self(tp, regs, this_cpu);
 254
 255         smp_fetch_global_regs();
 256
 257         for_each_online_cpu(cpu) {
 258                 struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg;
 259
 260                 __global_reg_poll(gp);
 261
 262                 tp = gp->thread;
 263                 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
 264                        (cpu == this_cpu ? '*' : ' '), cpu,
 265                        gp->tstate, gp->tpc, gp->tnpc,
 266                        ((tp && tp->task) ? tp->task->comm : "NULL"),
 267                        ((tp && tp->task) ? tp->task->pid : -1));
 268
 269                 if (gp->tstate & TSTATE_PRIV) {
 270                         printk("             TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
 271                                (void *) gp->tpc,
 272                                (void *) gp->o7,
 273                                (void *) gp->i7,
 274                                (void *) gp->rpc);
 275                 } else {
 276                         printk("             TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
 277                                gp->tpc, gp->o7, gp->i7, gp->rpc);
 278                 }
 279         }
 280
 281         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 282
 283         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
 284 }
 285
 286 #ifdef CONFIG_MAGIC_SYSRQ
 287
 288 static void sysrq_handle_globreg(int key)
 289 {
 290         arch_trigger_all_cpu_backtrace();
 291 }
 292
 293 static struct sysrq_key_op sparc_globalreg_op = {
 294         .handler        = sysrq_handle_globreg,
 295         .help_msg       = "global-regs(Y)",
 296         .action_msg     = "Show Global CPU Regs",
 297 };
 298
 299 static void __global_pmu_self(int this_cpu)
 300 {
 301         struct global_pmu_snapshot *pp;
 302         int i, num;
 303
 304         pp = &global_cpu_snapshot[this_cpu].pmu;
 305
 306         num = 1;
 307         if (tlb_type == hypervisor &&
 308             sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
 309                 num = 4;
 310
 311         for (i = 0; i < num; i++) {
 312                 pp->pcr[i] = pcr_ops->read_pcr(i);
 313                 pp->pic[i] = pcr_ops->read_pic(i);
 314         }
 315 }
 316
 317 static void __global_pmu_poll(struct global_pmu_snapshot *pp)
 318 {
 319         int limit = 0;
 320
 321         while (!pp->pcr[0] && ++limit < 100) {
 322                 barrier();
 323                 udelay(1);
 324         }
 325 }
 326
 327 static void pmu_snapshot_all_cpus(void)
 328 {
 329         unsigned long flags;
 330         int this_cpu, cpu;
 331
 332         spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
 333
 334         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 335
 336         this_cpu = raw_smp_processor_id();
 337
 338         __global_pmu_self(this_cpu);
 339
 340         smp_fetch_global_pmu();
 341
 342         for_each_online_cpu(cpu) {
 343                 struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
 344
 345                 __global_pmu_poll(pp);
 346
 347                 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
 348                        (cpu == this_cpu ? '*' : ' '), cpu,
 349                        pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
 350                        pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
 351         }
 352
 353         memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
 354
 355         spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
 356 }
 357
 358 static void sysrq_handle_globpmu(int key)
 359 {
 360         pmu_snapshot_all_cpus();
 361 }
 362
 363 static struct sysrq_key_op sparc_globalpmu_op = {
 364         .handler        = sysrq_handle_globpmu,
 365         .help_msg       = "global-pmu(X)",
 366         .action_msg     = "Show Global PMU Regs",
 367 };
 368
 369 static int __init sparc_sysrq_init(void)
 370 {
 371         int ret = register_sysrq_key('y', &sparc_globalreg_op);
 372
 373         if (!ret)
 374                 ret = register_sysrq_key('x', &sparc_globalpmu_op);
 375         return ret;
 376 }
 377
 378 core_initcall(sparc_sysrq_init);
 379
 380 #endif
 381
 382 unsigned long thread_saved_pc(struct task_struct *tsk)
 383 {
 384         struct thread_info *ti = task_thread_info(tsk);
 385         unsigned long ret = 0xdeadbeefUL;
 386
 387         if (ti && ti->ksp) {
 388                 unsigned long *sp;
 389                 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
 390                 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
 391                     sp[14]) {
 392                         unsigned long *fp;
 393                         fp = (unsigned long *)(sp[14] + STACK_BIAS);
 394                         if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
 395                                 ret = fp[15];
 396                 }
 397         }
 398         return ret;
 399 }
 400
 401 /* Free current thread data structures etc.. */
 402 void exit_thread(void)
 403 {
 404         struct thread_info *t = current_thread_info();
 405
 406         if (t->utraps) {
 407                 if (t->utraps[0] < 2)
 408                         kfree (t->utraps);
 409                 else
 410                         t->utraps[0]--;
 411         }
 412 }
 413
 414 void flush_thread(void)
 415 {
 416         struct thread_info *t = current_thread_info();
 417         struct mm_struct *mm;
 418
 419         mm = t->task->mm;
 420         if (mm)
 421                 tsb_context_switch(mm);
 422
 423         set_thread_wsaved(0);
 424
 425         /* Clear FPU register state. */
 426         t->fpsaved[0] = 0;
 427 }
 428
 429 /* It's a bit more tricky when 64-bit tasks are involved... */
 430 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
 431 {
 432         bool stack_64bit = test_thread_64bit_stack(psp);
 433         unsigned long fp, distance, rval;
 434
 435         if (stack_64bit) {
 436                 csp += STACK_BIAS;
 437                 psp += STACK_BIAS;
 438                 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
 439                 fp += STACK_BIAS;
 440                 if (test_thread_flag(TIF_32BIT))
 441                         fp &= 0xffffffff;
 442         } else
 443                 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
 444
 445         /* Now align the stack as this is mandatory in the Sparc ABI
 446          * due to how register windows work.  This hides the
 447          * restriction from thread libraries etc.
 448          */
 449         csp &= ~15UL;
 450
 451         distance = fp - psp;
 452         rval = (csp - distance);
 453         if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
 454                 rval = 0;
 455         else if (!stack_64bit) {
 456                 if (put_user(((u32)csp),
 457                              &(((struct reg_window32 __user *)rval)->ins[6])))
 458                         rval = 0;
 459         } else {
 460                 if (put_user(((u64)csp - STACK_BIAS),
 461                              &(((struct reg_window __user *)rval)->ins[6])))
 462                         rval = 0;
 463                 else
 464                         rval = rval - STACK_BIAS;
 465         }
 466
 467         return rval;
 468 }
 469
 470 /* Standard stuff. */
 471 static inline void shift_window_buffer(int first_win, int last_win,
 472                                        struct thread_info *t)
 473 {
 474         int i;
 475
 476         for (i = first_win; i < last_win; i++) {
 477                 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
 478                 memcpy(&t->reg_window[i], &t->reg_window[i+1],
 479                        sizeof(struct reg_window));
 480         }
 481 }
 482
 483 void synchronize_user_stack(void)
 484 {
 485         struct thread_info *t = current_thread_info();
 486         unsigned long window;
 487
 488         flush_user_windows();
 489         if ((window = get_thread_wsaved()) != 0) {
 490                 window -= 1;
 491                 do {
 492                         struct reg_window *rwin = &t->reg_window[window];
 493                         int winsize = sizeof(struct reg_window);
 494                         unsigned long sp;
 495
 496                         sp = t->rwbuf_stkptrs[window];
 497
 498                         if (test_thread_64bit_stack(sp))
 499                                 sp += STACK_BIAS;
 500                         else
 501                                 winsize = sizeof(struct reg_window32);
 502
 503                         if (!copy_to_user((char __user *)sp, rwin, winsize)) {
 504                                 shift_window_buffer(window, get_thread_wsaved() - 1, t);
 505                                 set_thread_wsaved(get_thread_wsaved() - 1);
 506                         }
 507                 } while (window--);
 508         }
 509 }
 510
 511 static void stack_unaligned(unsigned long sp)
 512 {
 513         siginfo_t info;
 514
 515         info.si_signo = SIGBUS;
 516         info.si_errno = 0;
 517         info.si_code = BUS_ADRALN;
 518         info.si_addr = (void __user *) sp;
 519         info.si_trapno = 0;
 520         force_sig_info(SIGBUS, &info, current);
 521 }
 522
 523 void fault_in_user_windows(void)
 524 {
 525         struct thread_info *t = current_thread_info();
 526         unsigned long window;
 527
 528         flush_user_windows();
 529         window = get_thread_wsaved();
 530
 531         if (likely(window != 0)) {
 532                 window -= 1;
 533                 do {
 534                         struct reg_window *rwin = &t->reg_window[window];
 535                         int winsize = sizeof(struct reg_window);
 536                         unsigned long sp;
 537
 538                         sp = t->rwbuf_stkptrs[window];
 539
 540                         if (test_thread_64bit_stack(sp))
 541                                 sp += STACK_BIAS;
 542                         else
 543                                 winsize = sizeof(struct reg_window32);
 544
 545                         if (unlikely(sp & 0x7UL))
 546                                 stack_unaligned(sp);
 547
 548                         if (unlikely(copy_to_user((char __user *)sp,
 549                                                   rwin, winsize)))
 550                                 goto barf;
 551                 } while (window--);
 552         }
 553         set_thread_wsaved(0);
 554         return;
 555
 556 barf:
 557         set_thread_wsaved(window + 1);
 558         do_exit(SIGILL);
 559 }
 560
 561 asmlinkage long sparc_do_fork(unsigned long clone_flags,
 562                               unsigned long stack_start,
 563                               struct pt_regs *regs,
 564                               unsigned long stack_size)
 565 {
 566         int __user *parent_tid_ptr, *child_tid_ptr;
 567         unsigned long orig_i1 = regs->u_regs[UREG_I1];
 568         long ret;
 569
 570 #ifdef CONFIG_COMPAT
 571         if (test_thread_flag(TIF_32BIT)) {
 572                 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
 573                 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
 574         } else
 575 #endif
 576         {
 577                 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
 578                 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
 579         }
 580
 581         ret = do_fork(clone_flags, stack_start, stack_size,
 582                       parent_tid_ptr, child_tid_ptr);
 583
 584         /* If we get an error and potentially restart the system
 585          * call, we're screwed because copy_thread() clobbered
 586          * the parent's %o1.  So detect that case and restore it
 587          * here.
 588          */
 589         if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
 590                 regs->u_regs[UREG_I1] = orig_i1;
 591
 592         return ret;
 593 }
 594
 595 /* Copy a Sparc thread.  The fork() return value conventions
 596  * under SunOS are nothing short of bletcherous:
 597  * Parent -->  %o0 == childs  pid, %o1 == 0
 598  * Child  -->  %o0 == parents pid, %o1 == 1
 599  */
 600 int copy_thread(unsigned long clone_flags, unsigned long sp,
 601                 unsigned long arg, struct task_struct *p)
 602 {
 603         struct thread_info *t = task_thread_info(p);
 604         struct pt_regs *regs = current_pt_regs();
 605         struct sparc_stackf *parent_sf;
 606         unsigned long child_stack_sz;
 607         char *child_trap_frame;
 608
 609         /* Calculate offset to stack_frame & pt_regs */
 610         child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
 611         child_trap_frame = (task_stack_page(p) +
 612                             (THREAD_SIZE - child_stack_sz));
 613
 614         t->new_child = 1;
 615         t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
 616         t->kregs = (struct pt_regs *) (child_trap_frame +
 617                                        sizeof(struct sparc_stackf));
 618         t->fpsaved[0] = 0;
 619
 620         if (unlikely(p->flags & PF_KTHREAD)) {
 621                 memset(child_trap_frame, 0, child_stack_sz);
 622                 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
 623                         (current_pt_regs()->tstate + 1) & TSTATE_CWP;
 624                 t->current_ds = ASI_P;
 625                 t->kregs->u_regs[UREG_G1] = sp; /* function */
 626                 t->kregs->u_regs[UREG_G2] = arg;
 627                 return 0;
 628         }
 629
 630         parent_sf = ((struct sparc_stackf *) regs) - 1;
 631         memcpy(child_trap_frame, parent_sf, child_stack_sz);
 632         if (t->flags & _TIF_32BIT) {
 633                 sp &= 0x00000000ffffffffUL;
 634                 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
 635         }
 636         t->kregs->u_regs[UREG_FP] = sp;
 637         __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] =
 638                 (regs->tstate + 1) & TSTATE_CWP;
 639         t->current_ds = ASI_AIUS;
 640         if (sp != regs->u_regs[UREG_FP]) {
 641                 unsigned long csp;
 642
 643                 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
 644                 if (!csp)
 645                         return -EFAULT;
 646                 t->kregs->u_regs[UREG_FP] = csp;
 647         }
 648         if (t->utraps)
 649                 t->utraps[0]++;
 650
 651         /* Set the return value for the child. */
 652         t->kregs->u_regs[UREG_I0] = current->pid;
 653         t->kregs->u_regs[UREG_I1] = 1;
 654
 655         /* Set the second return value for the parent. */
 656         regs->u_regs[UREG_I1] = 0;
 657
 658         if (clone_flags & CLONE_SETTLS)
 659                 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
 660
 661         return 0;
 662 }
 663
 664 typedef struct {
 665         union {
 666                 unsigned int    pr_regs[32];
 667                 unsigned long   pr_dregs[16];
 668         } pr_fr;
 669         unsigned int __unused;
 670         unsigned int    pr_fsr;
 671         unsigned char   pr_qcnt;
 672         unsigned char   pr_q_entrysize;
 673         unsigned char   pr_en;
 674         unsigned int    pr_q[64];
 675 } elf_fpregset_t32;
 676
 677 /*
 678  * fill in the fpu structure for a core dump.
 679  */
 680 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
 681 {
 682         unsigned long *kfpregs = current_thread_info()->fpregs;
 683         unsigned long fprs = current_thread_info()->fpsaved[0];
 684
 685         if (test_thread_flag(TIF_32BIT)) {
 686                 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
 687
 688                 if (fprs & FPRS_DL)
 689                         memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
 690                                sizeof(unsigned int) * 32);
 691                 else
 692                         memset(&fpregs32->pr_fr.pr_regs[0], 0,
 693                                sizeof(unsigned int) * 32);
 694                 fpregs32->pr_qcnt = 0;
 695                 fpregs32->pr_q_entrysize = 8;
 696                 memset(&fpregs32->pr_q[0], 0,
 697                        (sizeof(unsigned int) * 64));
 698                 if (fprs & FPRS_FEF) {
 699                         fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
 700                         fpregs32->pr_en = 1;
 701                 } else {
 702                         fpregs32->pr_fsr = 0;
 703                         fpregs32->pr_en = 0;
 704                 }
 705         } else {
 706                 if(fprs & FPRS_DL)
 707                         memcpy(&fpregs->pr_regs[0], kfpregs,
 708                                sizeof(unsigned int) * 32);
 709                 else
 710                         memset(&fpregs->pr_regs[0], 0,
 711                                sizeof(unsigned int) * 32);
 712                 if(fprs & FPRS_DU)
 713                         memcpy(&fpregs->pr_regs[16], kfpregs+16,
 714                                sizeof(unsigned int) * 32);
 715                 else
 716                         memset(&fpregs->pr_regs[16], 0,
 717                                sizeof(unsigned int) * 32);
 718                 if(fprs & FPRS_FEF) {
 719                         fpregs->pr_fsr = current_thread_info()->xfsr[0];
 720                         fpregs->pr_gsr = current_thread_info()->gsr[0];
 721                 } else {
 722                         fpregs->pr_fsr = fpregs->pr_gsr = 0;
 723                 }
 724                 fpregs->pr_fprs = fprs;
 725         }
 726         return 1;
 727 }
 728 EXPORT_SYMBOL(dump_fpu);
 729
 730 unsigned long get_wchan(struct task_struct *task)
 731 {
 732         unsigned long pc, fp, bias = 0;
 733         struct thread_info *tp;
 734         struct reg_window *rw;
 735         unsigned long ret = 0;
 736         int count = 0;
 737
 738         if (!task || task == current ||
 739             task->state == TASK_RUNNING)
 740                 goto out;
 741
 742         tp = task_thread_info(task);
 743         bias = STACK_BIAS;
 744         fp = task_thread_info(task)->ksp + bias;
 745
 746         do {
 747                 if (!kstack_valid(tp, fp))
 748                         break;
 749                 rw = (struct reg_window *) fp;
 750                 pc = rw->ins[7];
 751                 if (!in_sched_functions(pc)) {
 752                         ret = pc;
 753                         goto out;
 754                 }
 755                 fp = rw->ins[6] + bias;
 756         } while (++count < 16);
 757
 758 out:
 759         return ret;
 760 }