2 * linux/arch/parisc/traps.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1999, 2000 Philipp Rumpf <prumpf@tux.org>
9 * 'Traps.c' handles hardware traps and faults after we have saved some
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/string.h>
16 #include <linux/errno.h>
17 #include <linux/ptrace.h>
18 #include <linux/timer.h>
19 #include <linux/delay.h>
21 #include <linux/module.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
24 #include <linux/spinlock.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/console.h>
28 #include <linux/kallsyms.h>
30 #include <asm/assembly.h>
31 #include <asm/system.h>
32 #include <asm/uaccess.h>
35 #include <asm/traps.h>
36 #include <asm/unaligned.h>
37 #include <asm/atomic.h>
40 #include <asm/pdc_chassis.h>
41 #include <asm/unwind.h>
42 #include <asm/tlbflush.h>
43 #include <asm/cacheflush.h>
45 #include "../math-emu/math-emu.h" /* for handle_fpe() */
47 #define PRINT_USER_FAULTS /* (turn this on if you want user faults to be */
48 /* dumped to the console via printk) */
50 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
51 DEFINE_SPINLOCK(pa_dbit_lock);
54 int printbinary(char *buf, unsigned long x, int nbits)
56 unsigned long mask = 1UL << (nbits - 1);
58 *buf++ = (mask & x ? '1' : '0');
71 #define FFMT "%016llx" /* fpregs are 64-bit always */
73 #define PRINTREGS(lvl,r,f,fmt,x) \
74 printk("%s%s%02d-%02d " fmt " " fmt " " fmt " " fmt "\n", \
75 lvl, f, (x), (x+3), (r)[(x)+0], (r)[(x)+1], \
76 (r)[(x)+2], (r)[(x)+3])
78 static void print_gr(char *level, struct pt_regs *regs)
83 printk("%s\n", level);
84 printk("%s YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI\n", level);
85 printbinary(buf, regs->gr[0], 32);
86 printk("%sPSW: %s %s\n", level, buf, print_tainted());
88 for (i = 0; i < 32; i += 4)
89 PRINTREGS(level, regs->gr, "r", RFMT, i);
92 static void print_fr(char *level, struct pt_regs *regs)
96 struct { u32 sw[2]; } s;
98 /* FR are 64bit everywhere. Need to use asm to get the content
99 * of fpsr/fper1, and we assume that we won't have a FP Identify
100 * in our way, otherwise we're screwed.
101 * The fldd is used to restore the T-bit if there was one, as the
102 * store clears it anyway.
103 * PA2.0 book says "thou shall not use fstw on FPSR/FPERs" - T-Bone */
104 asm volatile ("fstd %%fr0,0(%1) \n\t"
105 "fldd 0(%1),%%fr0 \n\t"
106 : "=m" (s) : "r" (&s) : "r0");
108 printk("%s\n", level);
109 printk("%s VZOUICununcqcqcqcqcqcrmunTDVZOUI\n", level);
110 printbinary(buf, s.sw[0], 32);
111 printk("%sFPSR: %s\n", level, buf);
112 printk("%sFPER1: %08x\n", level, s.sw[1]);
114 /* here we'll print fr0 again, tho it'll be meaningless */
115 for (i = 0; i < 32; i += 4)
116 PRINTREGS(level, regs->fr, "fr", FFMT, i);
119 void show_regs(struct pt_regs *regs)
123 unsigned long cr30, cr31;
125 level = user_mode(regs) ? KERN_DEBUG : KERN_CRIT;
127 print_gr(level, regs);
129 for (i = 0; i < 8; i += 4)
130 PRINTREGS(level, regs->sr, "sr", RFMT, i);
133 print_fr(level, regs);
137 printk("%s\n", level);
138 printk("%sIASQ: " RFMT " " RFMT " IAOQ: " RFMT " " RFMT "\n",
139 level, regs->iasq[0], regs->iasq[1], regs->iaoq[0], regs->iaoq[1]);
140 printk("%s IIR: %08lx ISR: " RFMT " IOR: " RFMT "\n",
141 level, regs->iir, regs->isr, regs->ior);
142 printk("%s CPU: %8d CR30: " RFMT " CR31: " RFMT "\n",
143 level, current_thread_info()->cpu, cr30, cr31);
144 printk("%s ORIG_R28: " RFMT "\n", level, regs->orig_r28);
146 print_symbol(" IAOQ[0]: %s\n", regs->iaoq[0]);
148 print_symbol(" IAOQ[1]: %s\n", regs->iaoq[1]);
150 print_symbol(" RP(r2): %s\n", regs->gr[2]);
154 void dump_stack(void)
156 show_stack(NULL, NULL);
159 EXPORT_SYMBOL(dump_stack);
161 static void do_show_stack(struct unwind_frame_info *info)
165 printk("Backtrace:\n");
167 if (unwind_once(info) < 0 || info->ip == 0)
170 if (__kernel_text_address(info->ip)) {
171 printk(" [<" RFMT ">] ", info->ip);
172 #ifdef CONFIG_KALLSYMS
173 print_symbol("%s\n", info->ip);
184 void show_stack(struct task_struct *task, unsigned long *s)
186 struct unwind_frame_info info;
193 asm volatile ("copy %%r30, %0" : "=r"(sp));
194 r = kzalloc(sizeof(struct pt_regs), GFP_KERNEL);
197 r->iaoq[0] = (unsigned long)&&HERE;
198 r->gr[2] = (unsigned long)__builtin_return_address(0);
200 unwind_frame_init(&info, current, r);
203 unwind_frame_init_from_blocked_task(&info, task);
206 do_show_stack(&info);
209 void die_if_kernel(char *str, struct pt_regs *regs, long err)
211 if (user_mode(regs)) {
215 printk(KERN_CRIT "%s (pid %d): %s (code %ld) at " RFMT "\n",
216 current->comm, current->pid, str, err, regs->iaoq[0]);
217 #ifdef PRINT_USER_FAULTS
218 /* XXX for debugging only */
224 oops_in_progress = 1;
226 /* Amuse the user in a SPARC fashion */
228 " _______________________________ \n"
229 " < Your System ate a SPARC! Gah! >\n"
230 " ------------------------------- \n"
232 " \\ (xx)\\_______\n"
237 /* unlock the pdc lock if necessary */
238 pdc_emergency_unlock();
240 /* maybe the kernel hasn't booted very far yet and hasn't been able
241 * to initialize the serial or STI console. In that case we should
242 * re-enable the pdc console, so that the user will be able to
243 * identify the problem. */
244 if (!console_drivers)
245 pdc_console_restart();
247 printk(KERN_CRIT "%s (pid %d): %s (code %ld)\n",
248 current->comm, current->pid, str, err);
252 panic("Fatal exception in interrupt");
255 printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
257 panic("Fatal exception");
260 /* Wot's wrong wif bein' racy? */
261 if (current->thread.flags & PARISC_KERNEL_DEATH) {
262 printk(KERN_CRIT "%s() recursion detected.\n", __FUNCTION__);
267 current->thread.flags |= PARISC_KERNEL_DEATH;
271 int syscall_ipi(int (*syscall) (struct pt_regs *), struct pt_regs *regs)
273 return syscall(regs);
276 /* gdb uses break 4,8 */
277 #define GDB_BREAK_INSN 0x10004
278 void handle_gdb_break(struct pt_regs *regs, int wot)
283 si.si_addr = (void __user *) (regs->iaoq[0] & ~3);
284 si.si_signo = SIGTRAP;
286 force_sig_info(SIGTRAP, &si, current);
289 void handle_break(unsigned iir, struct pt_regs *regs)
295 #ifdef PRINT_USER_FAULTS
296 printk(KERN_DEBUG "break 0,0: pid=%d command='%s'\n",
297 current->pid, current->comm);
299 die_if_kernel("Breakpoint", regs, 0);
300 #ifdef PRINT_USER_FAULTS
303 si.si_code = TRAP_BRKPT;
304 si.si_addr = (void __user *) (regs->iaoq[0] & ~3);
305 si.si_signo = SIGTRAP;
306 force_sig_info(SIGTRAP, &si, current);
310 die_if_kernel("Breakpoint", regs, 0);
311 handle_gdb_break(regs, TRAP_BRKPT);
315 #ifdef PRINT_USER_FAULTS
316 printk(KERN_DEBUG "break %#08x: pid=%d command='%s'\n",
317 iir, current->pid, current->comm);
320 si.si_signo = SIGTRAP;
321 si.si_code = TRAP_BRKPT;
322 si.si_addr = (void __user *) (regs->iaoq[0] & ~3);
323 force_sig_info(SIGTRAP, &si, current);
331 printk(KERN_CRIT "TOC call.\n");
335 static void default_trap(int code, struct pt_regs *regs)
337 printk(KERN_ERR "Trap %d on CPU %d\n", code, smp_processor_id());
341 void (*cpu_lpmc) (int code, struct pt_regs *regs) = default_trap;
344 void transfer_pim_to_trap_frame(struct pt_regs *regs)
347 extern unsigned int hpmc_pim_data[];
348 struct pdc_hpmc_pim_11 *pim_narrow;
349 struct pdc_hpmc_pim_20 *pim_wide;
351 if (boot_cpu_data.cpu_type >= pcxu) {
353 pim_wide = (struct pdc_hpmc_pim_20 *)hpmc_pim_data;
356 * Note: The following code will probably generate a
357 * bunch of truncation error warnings from the compiler.
358 * Could be handled with an ifdef, but perhaps there
362 regs->gr[0] = pim_wide->cr[22];
364 for (i = 1; i < 32; i++)
365 regs->gr[i] = pim_wide->gr[i];
367 for (i = 0; i < 32; i++)
368 regs->fr[i] = pim_wide->fr[i];
370 for (i = 0; i < 8; i++)
371 regs->sr[i] = pim_wide->sr[i];
373 regs->iasq[0] = pim_wide->cr[17];
374 regs->iasq[1] = pim_wide->iasq_back;
375 regs->iaoq[0] = pim_wide->cr[18];
376 regs->iaoq[1] = pim_wide->iaoq_back;
378 regs->sar = pim_wide->cr[11];
379 regs->iir = pim_wide->cr[19];
380 regs->isr = pim_wide->cr[20];
381 regs->ior = pim_wide->cr[21];
384 pim_narrow = (struct pdc_hpmc_pim_11 *)hpmc_pim_data;
386 regs->gr[0] = pim_narrow->cr[22];
388 for (i = 1; i < 32; i++)
389 regs->gr[i] = pim_narrow->gr[i];
391 for (i = 0; i < 32; i++)
392 regs->fr[i] = pim_narrow->fr[i];
394 for (i = 0; i < 8; i++)
395 regs->sr[i] = pim_narrow->sr[i];
397 regs->iasq[0] = pim_narrow->cr[17];
398 regs->iasq[1] = pim_narrow->iasq_back;
399 regs->iaoq[0] = pim_narrow->cr[18];
400 regs->iaoq[1] = pim_narrow->iaoq_back;
402 regs->sar = pim_narrow->cr[11];
403 regs->iir = pim_narrow->cr[19];
404 regs->isr = pim_narrow->cr[20];
405 regs->ior = pim_narrow->cr[21];
409 * The following fields only have meaning if we came through
410 * another path. So just zero them here.
420 * This routine is called as a last resort when everything else
421 * has gone clearly wrong. We get called for faults in kernel space,
424 void parisc_terminate(char *msg, struct pt_regs *regs, int code, unsigned long offset)
426 static DEFINE_SPINLOCK(terminate_lock);
428 oops_in_progress = 1;
432 spin_lock(&terminate_lock);
434 /* unlock the pdc lock if necessary */
435 pdc_emergency_unlock();
437 /* restart pdc console if necessary */
438 if (!console_drivers)
439 pdc_console_restart();
441 /* Not all paths will gutter the processor... */
445 transfer_pim_to_trap_frame(regs);
455 /* show_stack(NULL, (unsigned long *)regs->gr[30]); */
456 struct unwind_frame_info info;
457 unwind_frame_init(&info, current, regs);
458 do_show_stack(&info);
462 printk(KERN_CRIT "%s: Code=%d regs=%p (Addr=" RFMT ")\n",
463 msg, code, regs, offset);
466 spin_unlock(&terminate_lock);
468 /* put soft power button back under hardware control;
469 * if the user had pressed it once at any time, the
470 * system will shut down immediately right here. */
471 pdc_soft_power_button(0);
473 /* Call kernel panic() so reboot timeouts work properly
474 * FIXME: This function should be on the list of
475 * panic notifiers, and we should call panic
476 * directly from the location that we wish.
477 * e.g. We should not call panic from
478 * parisc_terminate, but rather the oter way around.
479 * This hack works, prints the panic message twice,
480 * and it enables reboot timers!
485 void handle_interruption(int code, struct pt_regs *regs)
487 unsigned long fault_address = 0;
488 unsigned long fault_space = 0;
492 pdc_console_restart(); /* switch back to pdc if HPMC */
497 * If the priority level is still user, and the
498 * faulting space is not equal to the active space
499 * then the user is attempting something in a space
500 * that does not belong to them. Kill the process.
502 * This is normally the situation when the user
503 * attempts to jump into the kernel space at the
504 * wrong offset, be it at the gateway page or a
507 * We cannot normally signal the process because it
508 * could *be* on the gateway page, and processes
509 * executing on the gateway page can't have signals
512 * We merely readjust the address into the users
513 * space, at a destination address of zero, and
514 * allow processing to continue.
516 if (((unsigned long)regs->iaoq[0] & 3) &&
517 ((unsigned long)regs->iasq[0] != (unsigned long)regs->sr[7])) {
518 /* Kill the user process later */
519 regs->iaoq[0] = 0 | 3;
520 regs->iaoq[1] = regs->iaoq[0] + 4;
521 regs->iasq[0] = regs->iasq[0] = regs->sr[7];
522 regs->gr[0] &= ~PSW_B;
527 printk(KERN_CRIT "Interruption # %d\n", code);
533 /* High-priority machine check (HPMC) */
535 /* set up a new led state on systems shipped with a LED State panel */
536 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_HPMC);
538 parisc_terminate("High Priority Machine Check (HPMC)",
543 /* Power failure interrupt */
544 printk(KERN_CRIT "Power failure interrupt !\n");
548 /* Recovery counter trap */
549 regs->gr[0] &= ~PSW_R;
550 if (user_space(regs))
551 handle_gdb_break(regs, TRAP_TRACE);
552 /* else this must be the start of a syscall - just let it run */
556 /* Low-priority machine check */
557 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_LPMC);
565 /* Instruction TLB miss fault/Instruction page fault */
566 fault_address = regs->iaoq[0];
567 fault_space = regs->iasq[0];
571 /* Illegal instruction trap */
572 die_if_kernel("Illegal instruction", regs, code);
573 si.si_code = ILL_ILLOPC;
577 /* Break instruction trap */
578 handle_break(regs->iir,regs);
582 /* Privileged operation trap */
583 die_if_kernel("Privileged operation", regs, code);
584 si.si_code = ILL_PRVOPC;
588 /* Privileged register trap */
589 if ((regs->iir & 0xffdfffe0) == 0x034008a0) {
591 /* This is a MFCTL cr26/cr27 to gr instruction.
592 * PCXS traps on this, so we need to emulate it.
595 if (regs->iir & 0x00200000)
596 regs->gr[regs->iir & 0x1f] = mfctl(27);
598 regs->gr[regs->iir & 0x1f] = mfctl(26);
600 regs->iaoq[0] = regs->iaoq[1];
602 regs->iasq[0] = regs->iasq[1];
606 die_if_kernel("Privileged register usage", regs, code);
607 si.si_code = ILL_PRVREG;
609 si.si_signo = SIGILL;
611 si.si_addr = (void __user *) regs->iaoq[0];
612 force_sig_info(SIGILL, &si, current);
616 /* Overflow Trap, let the userland signal handler do the cleanup */
617 si.si_signo = SIGFPE;
618 si.si_code = FPE_INTOVF;
619 si.si_addr = (void __user *) regs->iaoq[0];
620 force_sig_info(SIGFPE, &si, current);
625 The condition succees in an instruction which traps
628 si.si_signo = SIGFPE;
629 /* Set to zero, and let the userspace app figure it out from
630 the insn pointed to by si_addr */
632 si.si_addr = (void __user *) regs->iaoq[0];
633 force_sig_info(SIGFPE, &si, current);
636 /* The kernel doesn't want to handle condition codes */
640 /* Assist Exception Trap, i.e. floating point exception. */
641 die_if_kernel("Floating point exception", regs, 0); /* quiet */
646 /* Data TLB miss fault/Data page fault */
649 /* Non-access instruction TLB miss fault */
650 /* The instruction TLB entry needed for the target address of the FIC
651 is absent, and hardware can't find it, so we get to cleanup */
654 /* Non-access data TLB miss fault/Non-access data page fault */
656 Still need to add slow path emulation code here!
657 If the insn used a non-shadow register, then the tlb
658 handlers could not have their side-effect (e.g. probe
659 writing to a target register) emulated since rfir would
660 erase the changes to said register. Instead we have to
661 setup everything, call this function we are in, and emulate
662 by hand. Technically we need to emulate:
663 fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw
665 fault_address = regs->ior;
666 fault_space = regs->isr;
670 /* PCXS only -- later cpu's split this into types 26,27 & 28 */
671 /* Check for unaligned access */
672 if (check_unaligned(regs)) {
673 handle_unaligned(regs);
678 /* PCXL: Data memory access rights trap */
679 fault_address = regs->ior;
680 fault_space = regs->isr;
684 /* Data memory break trap */
685 regs->gr[0] |= PSW_X; /* So we can single-step over the trap */
688 /* Page reference trap */
689 handle_gdb_break(regs, TRAP_HWBKPT);
693 /* Taken branch trap */
694 regs->gr[0] &= ~PSW_T;
695 if (user_space(regs))
696 handle_gdb_break(regs, TRAP_BRANCH);
697 /* else this must be the start of a syscall - just let it
703 /* Instruction access rights */
704 /* PCXL: Instruction memory protection trap */
707 * This could be caused by either: 1) a process attempting
708 * to execute within a vma that does not have execute
709 * permission, or 2) an access rights violation caused by a
710 * flush only translation set up by ptep_get_and_clear().
711 * So we check the vma permissions to differentiate the two.
712 * If the vma indicates we have execute permission, then
713 * the cause is the latter one. In this case, we need to
714 * call do_page_fault() to fix the problem.
717 if (user_mode(regs)) {
718 struct vm_area_struct *vma;
720 down_read(¤t->mm->mmap_sem);
721 vma = find_vma(current->mm,regs->iaoq[0]);
722 if (vma && (regs->iaoq[0] >= vma->vm_start)
723 && (vma->vm_flags & VM_EXEC)) {
725 fault_address = regs->iaoq[0];
726 fault_space = regs->iasq[0];
728 up_read(¤t->mm->mmap_sem);
729 break; /* call do_page_fault() */
731 up_read(¤t->mm->mmap_sem);
735 /* Data memory protection ID trap */
736 die_if_kernel("Protection id trap", regs, code);
737 si.si_code = SEGV_MAPERR;
738 si.si_signo = SIGSEGV;
741 si.si_addr = (void __user *) regs->iaoq[0];
743 si.si_addr = (void __user *) regs->ior;
744 force_sig_info(SIGSEGV, &si, current);
748 /* Unaligned data reference trap */
749 handle_unaligned(regs);
753 if (user_mode(regs)) {
754 #ifdef PRINT_USER_FAULTS
755 printk(KERN_DEBUG "\nhandle_interruption() pid=%d command='%s'\n",
756 current->pid, current->comm);
759 /* SIGBUS, for lack of a better one. */
760 si.si_signo = SIGBUS;
761 si.si_code = BUS_OBJERR;
763 si.si_addr = (void __user *) regs->ior;
764 force_sig_info(SIGBUS, &si, current);
767 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
769 parisc_terminate("Unexpected interruption", regs, code, 0);
773 if (user_mode(regs)) {
774 if ((fault_space >> SPACEID_SHIFT) != (regs->sr[7] >> SPACEID_SHIFT)) {
775 #ifdef PRINT_USER_FAULTS
776 if (fault_space == 0)
777 printk(KERN_DEBUG "User Fault on Kernel Space ");
779 printk(KERN_DEBUG "User Fault (long pointer) (fault %d) ",
781 printk("pid=%d command='%s'\n", current->pid, current->comm);
784 si.si_signo = SIGSEGV;
786 si.si_code = SEGV_MAPERR;
787 si.si_addr = (void __user *) regs->ior;
788 force_sig_info(SIGSEGV, &si, current);
795 * The kernel should never fault on its own address space.
798 if (fault_space == 0)
800 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
801 parisc_terminate("Kernel Fault", regs, code, fault_address);
806 do_page_fault(regs, code, fault_address);
810 int __init check_ivt(void *iva)
817 extern void os_hpmc(void);
818 extern void os_hpmc_end(void);
820 if (strcmp((char *)iva, "cows can fly"))
825 for (i = 0; i < 8; i++)
828 /* Compute Checksum for HPMC handler */
830 length = (u32)((unsigned long)os_hpmc_end - (unsigned long)os_hpmc);
833 hpmcp = (u32 *)os_hpmc;
835 for (i=0; i<length/4; i++)
847 extern const void fault_vector_11;
849 extern const void fault_vector_20;
851 void __init trap_init(void)
855 if (boot_cpu_data.cpu_type >= pcxu)
856 iva = (void *) &fault_vector_20;
859 panic("Can't boot 64-bit OS on PA1.1 processor!");
861 iva = (void *) &fault_vector_11;
865 panic("IVT invalid");