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/sched/debug.h> 18 #include <linux/sched/task.h> 19 #include <linux/sched/task_stack.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/fs.h> 23 #include <linux/smp.h> 24 #include <linux/stddef.h> 25 #include <linux/ptrace.h> 26 #include <linux/slab.h> 27 #include <linux/user.h> 28 #include <linux/delay.h> 29 #include <linux/compat.h> 30 #include <linux/tick.h> 31 #include <linux/init.h> 32 #include <linux/cpu.h> 33 #include <linux/perf_event.h> 34 #include <linux/elfcore.h> 35 #include <linux/sysrq.h> 36 #include <linux/nmi.h> 37 #include <linux/context_tracking.h> 38 39 #include <linux/uaccess.h> 40 #include <asm/page.h> 41 #include <asm/pgalloc.h> 42 #include <asm/pgtable.h> 43 #include <asm/processor.h> 44 #include <asm/pstate.h> 45 #include <asm/elf.h> 46 #include <asm/fpumacro.h> 47 #include <asm/head.h> 48 #include <asm/cpudata.h> 49 #include <asm/mmu_context.h> 50 #include <asm/unistd.h> 51 #include <asm/hypervisor.h> 52 #include <asm/syscalls.h> 53 #include <asm/irq_regs.h> 54 #include <asm/smp.h> 55 #include <asm/pcr.h> 56 57 #include "kstack.h" 58 59 /* Idle loop support on sparc64. */ 60 void arch_cpu_idle(void) 61 { 62 if (tlb_type != hypervisor) { 63 touch_nmi_watchdog(); 64 local_irq_enable(); 65 } else { 66 unsigned long pstate; 67 68 local_irq_enable(); 69 70 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over 71 * the cpu sleep hypervisor call. 72 */ 73 __asm__ __volatile__( 74 "rdpr %%pstate, %0\n\t" 75 "andn %0, %1, %0\n\t" 76 "wrpr %0, %%g0, %%pstate" 77 : "=&r" (pstate) 78 : "i" (PSTATE_IE)); 79 80 if (!need_resched() && !cpu_is_offline(smp_processor_id())) 81 sun4v_cpu_yield(); 82 83 /* Re-enable interrupts. */ 84 __asm__ __volatile__( 85 "rdpr %%pstate, %0\n\t" 86 "or %0, %1, %0\n\t" 87 "wrpr %0, %%g0, %%pstate" 88 : "=&r" (pstate) 89 : "i" (PSTATE_IE)); 90 } 91 } 92 93 #ifdef CONFIG_HOTPLUG_CPU 94 void arch_cpu_idle_dead(void) 95 { 96 sched_preempt_enable_no_resched(); 97 cpu_play_dead(); 98 } 99 #endif 100 101 #ifdef CONFIG_COMPAT 102 static void show_regwindow32(struct pt_regs *regs) 103 { 104 struct reg_window32 __user *rw; 105 struct reg_window32 r_w; 106 mm_segment_t old_fs; 107 108 __asm__ __volatile__ ("flushw"); 109 rw = compat_ptr((unsigned int)regs->u_regs[14]); 110 old_fs = get_fs(); 111 set_fs (USER_DS); 112 if (copy_from_user (&r_w, rw, sizeof(r_w))) { 113 set_fs (old_fs); 114 return; 115 } 116 117 set_fs (old_fs); 118 printk("l0: %08x l1: %08x l2: %08x l3: %08x " 119 "l4: %08x l5: %08x l6: %08x l7: %08x\n", 120 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], 121 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); 122 printk("i0: %08x i1: %08x i2: %08x i3: %08x " 123 "i4: %08x i5: %08x i6: %08x i7: %08x\n", 124 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], 125 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); 126 } 127 #else 128 #define show_regwindow32(regs) do { } while (0) 129 #endif 130 131 static void show_regwindow(struct pt_regs *regs) 132 { 133 struct reg_window __user *rw; 134 struct reg_window *rwk; 135 struct reg_window r_w; 136 mm_segment_t old_fs; 137 138 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { 139 __asm__ __volatile__ ("flushw"); 140 rw = (struct reg_window __user *) 141 (regs->u_regs[14] + STACK_BIAS); 142 rwk = (struct reg_window *) 143 (regs->u_regs[14] + STACK_BIAS); 144 if (!(regs->tstate & TSTATE_PRIV)) { 145 old_fs = get_fs(); 146 set_fs (USER_DS); 147 if (copy_from_user (&r_w, rw, sizeof(r_w))) { 148 set_fs (old_fs); 149 return; 150 } 151 rwk = &r_w; 152 set_fs (old_fs); 153 } 154 } else { 155 show_regwindow32(regs); 156 return; 157 } 158 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", 159 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); 160 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", 161 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); 162 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", 163 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); 164 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", 165 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); 166 if (regs->tstate & TSTATE_PRIV) 167 printk("I7: <%pS>\n", (void *) rwk->ins[7]); 168 } 169 170 void show_regs(struct pt_regs *regs) 171 { 172 show_regs_print_info(KERN_DEFAULT); 173 174 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, 175 regs->tpc, regs->tnpc, regs->y, print_tainted()); 176 printk("TPC: <%pS>\n", (void *) regs->tpc); 177 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", 178 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], 179 regs->u_regs[3]); 180 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", 181 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], 182 regs->u_regs[7]); 183 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", 184 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], 185 regs->u_regs[11]); 186 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", 187 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], 188 regs->u_regs[15]); 189 printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); 190 show_regwindow(regs); 191 show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); 192 } 193 194 union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; 195 static DEFINE_SPINLOCK(global_cpu_snapshot_lock); 196 197 static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, 198 int this_cpu) 199 { 200 struct global_reg_snapshot *rp; 201 202 flushw_all(); 203 204 rp = &global_cpu_snapshot[this_cpu].reg; 205 206 rp->tstate = regs->tstate; 207 rp->tpc = regs->tpc; 208 rp->tnpc = regs->tnpc; 209 rp->o7 = regs->u_regs[UREG_I7]; 210 211 if (regs->tstate & TSTATE_PRIV) { 212 struct reg_window *rw; 213 214 rw = (struct reg_window *) 215 (regs->u_regs[UREG_FP] + STACK_BIAS); 216 if (kstack_valid(tp, (unsigned long) rw)) { 217 rp->i7 = rw->ins[7]; 218 rw = (struct reg_window *) 219 (rw->ins[6] + STACK_BIAS); 220 if (kstack_valid(tp, (unsigned long) rw)) 221 rp->rpc = rw->ins[7]; 222 } 223 } else { 224 rp->i7 = 0; 225 rp->rpc = 0; 226 } 227 rp->thread = tp; 228 } 229 230 /* In order to avoid hangs we do not try to synchronize with the 231 * global register dump client cpus. The last store they make is to 232 * the thread pointer, so do a short poll waiting for that to become 233 * non-NULL. 234 */ 235 static void __global_reg_poll(struct global_reg_snapshot *gp) 236 { 237 int limit = 0; 238 239 while (!gp->thread && ++limit < 100) { 240 barrier(); 241 udelay(1); 242 } 243 } 244 245 void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) 246 { 247 struct thread_info *tp = current_thread_info(); 248 struct pt_regs *regs = get_irq_regs(); 249 unsigned long flags; 250 int this_cpu, cpu; 251 252 if (!regs) 253 regs = tp->kregs; 254 255 spin_lock_irqsave(&global_cpu_snapshot_lock, flags); 256 257 this_cpu = raw_smp_processor_id(); 258 259 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); 260 261 if (cpumask_test_cpu(this_cpu, mask) && !exclude_self) 262 __global_reg_self(tp, regs, this_cpu); 263 264 smp_fetch_global_regs(); 265 266 for_each_cpu(cpu, mask) { 267 struct global_reg_snapshot *gp; 268 269 if (exclude_self && cpu == this_cpu) 270 continue; 271 272 gp = &global_cpu_snapshot[cpu].reg; 273 274 __global_reg_poll(gp); 275 276 tp = gp->thread; 277 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", 278 (cpu == this_cpu ? '*' : ' '), cpu, 279 gp->tstate, gp->tpc, gp->tnpc, 280 ((tp && tp->task) ? tp->task->comm : "NULL"), 281 ((tp && tp->task) ? tp->task->pid : -1)); 282 283 if (gp->tstate & TSTATE_PRIV) { 284 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", 285 (void *) gp->tpc, 286 (void *) gp->o7, 287 (void *) gp->i7, 288 (void *) gp->rpc); 289 } else { 290 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", 291 gp->tpc, gp->o7, gp->i7, gp->rpc); 292 } 293 294 touch_nmi_watchdog(); 295 } 296 297 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); 298 299 spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); 300 } 301 302 #ifdef CONFIG_MAGIC_SYSRQ 303 304 static void sysrq_handle_globreg(int key) 305 { 306 trigger_all_cpu_backtrace(); 307 } 308 309 static struct sysrq_key_op sparc_globalreg_op = { 310 .handler = sysrq_handle_globreg, 311 .help_msg = "global-regs(y)", 312 .action_msg = "Show Global CPU Regs", 313 }; 314 315 static void __global_pmu_self(int this_cpu) 316 { 317 struct global_pmu_snapshot *pp; 318 int i, num; 319 320 if (!pcr_ops) 321 return; 322 323 pp = &global_cpu_snapshot[this_cpu].pmu; 324 325 num = 1; 326 if (tlb_type == hypervisor && 327 sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) 328 num = 4; 329 330 for (i = 0; i < num; i++) { 331 pp->pcr[i] = pcr_ops->read_pcr(i); 332 pp->pic[i] = pcr_ops->read_pic(i); 333 } 334 } 335 336 static void __global_pmu_poll(struct global_pmu_snapshot *pp) 337 { 338 int limit = 0; 339 340 while (!pp->pcr[0] && ++limit < 100) { 341 barrier(); 342 udelay(1); 343 } 344 } 345 346 static void pmu_snapshot_all_cpus(void) 347 { 348 unsigned long flags; 349 int this_cpu, cpu; 350 351 spin_lock_irqsave(&global_cpu_snapshot_lock, flags); 352 353 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); 354 355 this_cpu = raw_smp_processor_id(); 356 357 __global_pmu_self(this_cpu); 358 359 smp_fetch_global_pmu(); 360 361 for_each_online_cpu(cpu) { 362 struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu; 363 364 __global_pmu_poll(pp); 365 366 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n", 367 (cpu == this_cpu ? '*' : ' '), cpu, 368 pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], 369 pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]); 370 371 touch_nmi_watchdog(); 372 } 373 374 memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); 375 376 spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); 377 } 378 379 static void sysrq_handle_globpmu(int key) 380 { 381 pmu_snapshot_all_cpus(); 382 } 383 384 static struct sysrq_key_op sparc_globalpmu_op = { 385 .handler = sysrq_handle_globpmu, 386 .help_msg = "global-pmu(x)", 387 .action_msg = "Show Global PMU Regs", 388 }; 389 390 static int __init sparc_sysrq_init(void) 391 { 392 int ret = register_sysrq_key('y', &sparc_globalreg_op); 393 394 if (!ret) 395 ret = register_sysrq_key('x', &sparc_globalpmu_op); 396 return ret; 397 } 398 399 core_initcall(sparc_sysrq_init); 400 401 #endif 402 403 /* Free current thread data structures etc.. */ 404 void exit_thread(struct task_struct *tsk) 405 { 406 struct thread_info *t = task_thread_info(tsk); 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 user_exit(); 561 do_exit(SIGILL); 562 } 563 564 asmlinkage long sparc_do_fork(unsigned long clone_flags, 565 unsigned long stack_start, 566 struct pt_regs *regs, 567 unsigned long stack_size) 568 { 569 int __user *parent_tid_ptr, *child_tid_ptr; 570 unsigned long orig_i1 = regs->u_regs[UREG_I1]; 571 long ret; 572 573 #ifdef CONFIG_COMPAT 574 if (test_thread_flag(TIF_32BIT)) { 575 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); 576 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); 577 } else 578 #endif 579 { 580 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; 581 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; 582 } 583 584 ret = do_fork(clone_flags, stack_start, stack_size, 585 parent_tid_ptr, child_tid_ptr); 586 587 /* If we get an error and potentially restart the system 588 * call, we're screwed because copy_thread() clobbered 589 * the parent's %o1. So detect that case and restore it 590 * here. 591 */ 592 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) 593 regs->u_regs[UREG_I1] = orig_i1; 594 595 return ret; 596 } 597 598 /* Copy a Sparc thread. The fork() return value conventions 599 * under SunOS are nothing short of bletcherous: 600 * Parent --> %o0 == childs pid, %o1 == 0 601 * Child --> %o0 == parents pid, %o1 == 1 602 */ 603 int copy_thread(unsigned long clone_flags, unsigned long sp, 604 unsigned long arg, struct task_struct *p) 605 { 606 struct thread_info *t = task_thread_info(p); 607 struct pt_regs *regs = current_pt_regs(); 608 struct sparc_stackf *parent_sf; 609 unsigned long child_stack_sz; 610 char *child_trap_frame; 611 612 /* Calculate offset to stack_frame & pt_regs */ 613 child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ); 614 child_trap_frame = (task_stack_page(p) + 615 (THREAD_SIZE - child_stack_sz)); 616 617 t->new_child = 1; 618 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; 619 t->kregs = (struct pt_regs *) (child_trap_frame + 620 sizeof(struct sparc_stackf)); 621 t->fpsaved[0] = 0; 622 623 if (unlikely(p->flags & PF_KTHREAD)) { 624 memset(child_trap_frame, 0, child_stack_sz); 625 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = 626 (current_pt_regs()->tstate + 1) & TSTATE_CWP; 627 t->current_ds = ASI_P; 628 t->kregs->u_regs[UREG_G1] = sp; /* function */ 629 t->kregs->u_regs[UREG_G2] = arg; 630 return 0; 631 } 632 633 parent_sf = ((struct sparc_stackf *) regs) - 1; 634 memcpy(child_trap_frame, parent_sf, child_stack_sz); 635 if (t->flags & _TIF_32BIT) { 636 sp &= 0x00000000ffffffffUL; 637 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; 638 } 639 t->kregs->u_regs[UREG_FP] = sp; 640 __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = 641 (regs->tstate + 1) & TSTATE_CWP; 642 t->current_ds = ASI_AIUS; 643 if (sp != regs->u_regs[UREG_FP]) { 644 unsigned long csp; 645 646 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); 647 if (!csp) 648 return -EFAULT; 649 t->kregs->u_regs[UREG_FP] = csp; 650 } 651 if (t->utraps) 652 t->utraps[0]++; 653 654 /* Set the return value for the child. */ 655 t->kregs->u_regs[UREG_I0] = current->pid; 656 t->kregs->u_regs[UREG_I1] = 1; 657 658 /* Set the second return value for the parent. */ 659 regs->u_regs[UREG_I1] = 0; 660 661 if (clone_flags & CLONE_SETTLS) 662 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; 663 664 return 0; 665 } 666 667 typedef struct { 668 union { 669 unsigned int pr_regs[32]; 670 unsigned long pr_dregs[16]; 671 } pr_fr; 672 unsigned int __unused; 673 unsigned int pr_fsr; 674 unsigned char pr_qcnt; 675 unsigned char pr_q_entrysize; 676 unsigned char pr_en; 677 unsigned int pr_q[64]; 678 } elf_fpregset_t32; 679 680 /* 681 * fill in the fpu structure for a core dump. 682 */ 683 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) 684 { 685 unsigned long *kfpregs = current_thread_info()->fpregs; 686 unsigned long fprs = current_thread_info()->fpsaved[0]; 687 688 if (test_thread_flag(TIF_32BIT)) { 689 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; 690 691 if (fprs & FPRS_DL) 692 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, 693 sizeof(unsigned int) * 32); 694 else 695 memset(&fpregs32->pr_fr.pr_regs[0], 0, 696 sizeof(unsigned int) * 32); 697 fpregs32->pr_qcnt = 0; 698 fpregs32->pr_q_entrysize = 8; 699 memset(&fpregs32->pr_q[0], 0, 700 (sizeof(unsigned int) * 64)); 701 if (fprs & FPRS_FEF) { 702 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; 703 fpregs32->pr_en = 1; 704 } else { 705 fpregs32->pr_fsr = 0; 706 fpregs32->pr_en = 0; 707 } 708 } else { 709 if(fprs & FPRS_DL) 710 memcpy(&fpregs->pr_regs[0], kfpregs, 711 sizeof(unsigned int) * 32); 712 else 713 memset(&fpregs->pr_regs[0], 0, 714 sizeof(unsigned int) * 32); 715 if(fprs & FPRS_DU) 716 memcpy(&fpregs->pr_regs[16], kfpregs+16, 717 sizeof(unsigned int) * 32); 718 else 719 memset(&fpregs->pr_regs[16], 0, 720 sizeof(unsigned int) * 32); 721 if(fprs & FPRS_FEF) { 722 fpregs->pr_fsr = current_thread_info()->xfsr[0]; 723 fpregs->pr_gsr = current_thread_info()->gsr[0]; 724 } else { 725 fpregs->pr_fsr = fpregs->pr_gsr = 0; 726 } 727 fpregs->pr_fprs = fprs; 728 } 729 return 1; 730 } 731 EXPORT_SYMBOL(dump_fpu); 732 733 unsigned long get_wchan(struct task_struct *task) 734 { 735 unsigned long pc, fp, bias = 0; 736 struct thread_info *tp; 737 struct reg_window *rw; 738 unsigned long ret = 0; 739 int count = 0; 740 741 if (!task || task == current || 742 task->state == TASK_RUNNING) 743 goto out; 744 745 tp = task_thread_info(task); 746 bias = STACK_BIAS; 747 fp = task_thread_info(task)->ksp + bias; 748 749 do { 750 if (!kstack_valid(tp, fp)) 751 break; 752 rw = (struct reg_window *) fp; 753 pc = rw->ins[7]; 754 if (!in_sched_functions(pc)) { 755 ret = pc; 756 goto out; 757 } 758 fp = rw->ins[6] + bias; 759 } while (++count < 16); 760 761 out: 762 return ret; 763 } 764