1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Kernel support for the ptrace() and syscall tracing interfaces.
  4 *
  5 * Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc.
  6 * Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx>
  7 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
  8 * Copyright (C) 2008-2016 Helge Deller <deller@gmx.de>
  9 */
 10
 11#include <linux/kernel.h>
 12#include <linux/sched.h>
 13#include <linux/mm.h>
 14#include <linux/smp.h>
 15#include <linux/elf.h>
 16#include <linux/errno.h>
 17#include <linux/ptrace.h>
 18#include <linux/tracehook.h>
 19#include <linux/user.h>
 20#include <linux/personality.h>
 21#include <linux/regset.h>
 22#include <linux/security.h>
 23#include <linux/seccomp.h>
 24#include <linux/compat.h>
 25#include <linux/signal.h>
 26#include <linux/audit.h>
 27
 28#include <linux/uaccess.h>
 29#include <asm/pgtable.h>
 
 30#include <asm/processor.h>
 31#include <asm/asm-offsets.h>
 32
 33/* PSW bits we allow the debugger to modify */
 34#define USER_PSW_BITS	(PSW_N | PSW_B | PSW_V | PSW_CB)
 35
 36#define CREATE_TRACE_POINTS
 37#include <trace/events/syscalls.h>
 38
 39/*
 40 * These are our native regset flavors.
 41 */
 42enum parisc_regset {
 43	REGSET_GENERAL,
 44	REGSET_FP
 45};
 46
 47/*
 48 * Called by kernel/ptrace.c when detaching..
 49 *
 50 * Make sure single step bits etc are not set.
 51 */
 52void ptrace_disable(struct task_struct *task)
 53{
 54	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 55	clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
 56
 57	/* make sure the trap bits are not set */
 58	pa_psw(task)->r = 0;
 59	pa_psw(task)->t = 0;
 60	pa_psw(task)->h = 0;
 61	pa_psw(task)->l = 0;
 62}
 63
 64/*
 65 * The following functions are called by ptrace_resume() when
 66 * enabling or disabling single/block tracing.
 67 */
 68void user_disable_single_step(struct task_struct *task)
 69{
 70	ptrace_disable(task);
 71}
 72
 73void user_enable_single_step(struct task_struct *task)
 74{
 75	clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
 76	set_tsk_thread_flag(task, TIF_SINGLESTEP);
 77
 78	if (pa_psw(task)->n) {
 
 
 79		/* Nullified, just crank over the queue. */
 80		task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
 81		task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
 82		task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4;
 83		pa_psw(task)->n = 0;
 84		pa_psw(task)->x = 0;
 85		pa_psw(task)->y = 0;
 86		pa_psw(task)->z = 0;
 87		pa_psw(task)->b = 0;
 88		ptrace_disable(task);
 89		/* Don't wake up the task, but let the
 90		   parent know something happened. */
 91		force_sig_fault_to_task(SIGTRAP, TRAP_TRACE,
 92					(void __user *) (task_regs(task)->iaoq[0] & ~3),
 93					task);
 
 
 94		/* notify_parent(task, SIGCHLD); */
 95		return;
 96	}
 97
 98	/* Enable recovery counter traps.  The recovery counter
 99	 * itself will be set to zero on a task switch.  If the
100	 * task is suspended on a syscall then the syscall return
101	 * path will overwrite the recovery counter with a suitable
102	 * value such that it traps once back in user space.  We
103	 * disable interrupts in the tasks PSW here also, to avoid
104	 * interrupts while the recovery counter is decrementing.
105	 */
106	pa_psw(task)->r = 1;
107	pa_psw(task)->t = 0;
108	pa_psw(task)->h = 0;
109	pa_psw(task)->l = 0;
110}
111
112void user_enable_block_step(struct task_struct *task)
113{
114	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
115	set_tsk_thread_flag(task, TIF_BLOCKSTEP);
116
117	/* Enable taken branch trap. */
118	pa_psw(task)->r = 0;
119	pa_psw(task)->t = 1;
120	pa_psw(task)->h = 0;
121	pa_psw(task)->l = 0;
122}
123
124long arch_ptrace(struct task_struct *child, long request,
125		 unsigned long addr, unsigned long data)
126{
127	unsigned long __user *datap = (unsigned long __user *)data;
128	unsigned long tmp;
129	long ret = -EIO;
130
131	switch (request) {
132
133	/* Read the word at location addr in the USER area.  For ptraced
134	   processes, the kernel saves all regs on a syscall. */
135	case PTRACE_PEEKUSR:
136		if ((addr & (sizeof(unsigned long)-1)) ||
137		     addr >= sizeof(struct pt_regs))
138			break;
139		tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
140		ret = put_user(tmp, datap);
141		break;
142
143	/* Write the word at location addr in the USER area.  This will need
144	   to change when the kernel no longer saves all regs on a syscall.
145	   FIXME.  There is a problem at the moment in that r3-r18 are only
146	   saved if the process is ptraced on syscall entry, and even then
147	   those values are overwritten by actual register values on syscall
148	   exit. */
149	case PTRACE_POKEUSR:
150		/* Some register values written here may be ignored in
151		 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
152		 * r31/r31+4, and not with the values in pt_regs.
153		 */
154		if (addr == PT_PSW) {
155			/* Allow writing to Nullify, Divide-step-correction,
156			 * and carry/borrow bits.
157			 * BEWARE, if you set N, and then single step, it won't
158			 * stop on the nullified instruction.
159			 */
160			data &= USER_PSW_BITS;
161			task_regs(child)->gr[0] &= ~USER_PSW_BITS;
162			task_regs(child)->gr[0] |= data;
163			ret = 0;
164			break;
165		}
166
167		if ((addr & (sizeof(unsigned long)-1)) ||
168		     addr >= sizeof(struct pt_regs))
169			break;
170		if (addr == PT_IAOQ0 || addr == PT_IAOQ1) {
171			data |= 3; /* ensure userspace privilege */
172		}
173		if ((addr >= PT_GR1 && addr <= PT_GR31) ||
174				addr == PT_IAOQ0 || addr == PT_IAOQ1 ||
175				(addr >= PT_FR0 && addr <= PT_FR31 + 4) ||
176				addr == PT_SAR) {
177			*(unsigned long *) ((char *) task_regs(child) + addr) = data;
178			ret = 0;
179		}
180		break;
181
182	case PTRACE_GETREGS:	/* Get all gp regs from the child. */
183		return copy_regset_to_user(child,
184					   task_user_regset_view(current),
185					   REGSET_GENERAL,
186					   0, sizeof(struct user_regs_struct),
187					   datap);
188
189	case PTRACE_SETREGS:	/* Set all gp regs in the child. */
190		return copy_regset_from_user(child,
191					     task_user_regset_view(current),
192					     REGSET_GENERAL,
193					     0, sizeof(struct user_regs_struct),
194					     datap);
195
196	case PTRACE_GETFPREGS:	/* Get the child FPU state. */
197		return copy_regset_to_user(child,
198					   task_user_regset_view(current),
199					   REGSET_FP,
200					   0, sizeof(struct user_fp_struct),
201					   datap);
202
203	case PTRACE_SETFPREGS:	/* Set the child FPU state. */
204		return copy_regset_from_user(child,
205					     task_user_regset_view(current),
206					     REGSET_FP,
207					     0, sizeof(struct user_fp_struct),
208					     datap);
209
210	default:
211		ret = ptrace_request(child, request, addr, data);
212		break;
213	}
214
215	return ret;
216}
217
218
219#ifdef CONFIG_COMPAT
220
221/* This function is needed to translate 32 bit pt_regs offsets in to
222 * 64 bit pt_regs offsets.  For example, a 32 bit gdb under a 64 bit kernel
223 * will request offset 12 if it wants gr3, but the lower 32 bits of
224 * the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4).
225 * This code relies on a 32 bit pt_regs being comprised of 32 bit values
226 * except for the fp registers which (a) are 64 bits, and (b) follow
227 * the gr registers at the start of pt_regs.  The 32 bit pt_regs should
228 * be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[]
229 * being 64 bit in both cases.
230 */
231
232static compat_ulong_t translate_usr_offset(compat_ulong_t offset)
233{
234	compat_ulong_t pos;
235
236	if (offset < 32*4)	/* gr[0..31] */
237		pos = offset * 2 + 4;
238	else if (offset < 32*4+32*8)	/* fr[0] ... fr[31] */
239		pos = (offset - 32*4) + PT_FR0;
240	else if (offset < sizeof(struct pt_regs)/2 + 32*4) /* sr[0] ... ipsw */
241		pos = (offset - 32*4 - 32*8) * 2 + PT_SR0 + 4;
242	else
243		pos = sizeof(struct pt_regs);
244
245	return pos;
246}
247
248long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
249			compat_ulong_t addr, compat_ulong_t data)
250{
251	compat_uint_t tmp;
252	long ret = -EIO;
253
254	switch (request) {
255
256	case PTRACE_PEEKUSR:
257		if (addr & (sizeof(compat_uint_t)-1))
258			break;
259		addr = translate_usr_offset(addr);
260		if (addr >= sizeof(struct pt_regs))
261			break;
262
263		tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
264		ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
265		break;
266
267	/* Write the word at location addr in the USER area.  This will need
268	   to change when the kernel no longer saves all regs on a syscall.
269	   FIXME.  There is a problem at the moment in that r3-r18 are only
270	   saved if the process is ptraced on syscall entry, and even then
271	   those values are overwritten by actual register values on syscall
272	   exit. */
273	case PTRACE_POKEUSR:
274		/* Some register values written here may be ignored in
275		 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
276		 * r31/r31+4, and not with the values in pt_regs.
277		 */
278		if (addr == PT_PSW) {
279			/* Since PT_PSW==0, it is valid for 32 bit processes
280			 * under 64 bit kernels as well.
281			 */
282			ret = arch_ptrace(child, request, addr, data);
283		} else {
284			if (addr & (sizeof(compat_uint_t)-1))
285				break;
286			addr = translate_usr_offset(addr);
287			if (addr >= sizeof(struct pt_regs))
288				break;
289			if (addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4) {
290				data |= 3; /* ensure userspace privilege */
291			}
292			if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
293				/* Special case, fp regs are 64 bits anyway */
294				*(__u32 *) ((char *) task_regs(child) + addr) = data;
295				ret = 0;
296			}
297			else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
298					addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
299					addr == PT_SAR+4) {
300				/* Zero the top 32 bits */
301				*(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
302				*(__u32 *) ((char *) task_regs(child) + addr) = data;
303				ret = 0;
304			}
305		}
306		break;
307
308	default:
309		ret = compat_ptrace_request(child, request, addr, data);
310		break;
311	}
312
313	return ret;
314}
315#endif
316
317long do_syscall_trace_enter(struct pt_regs *regs)
318{
319	if (test_thread_flag(TIF_SYSCALL_TRACE)) {
320		int rc = tracehook_report_syscall_entry(regs);
321
322		/*
323		 * As tracesys_next does not set %r28 to -ENOSYS
324		 * when %r20 is set to -1, initialize it here.
325		 */
326		regs->gr[28] = -ENOSYS;
327
328		if (rc) {
329			/*
330			 * A nonzero return code from
331			 * tracehook_report_syscall_entry() tells us
332			 * to prevent the syscall execution.  Skip
333			 * the syscall call and the syscall restart handling.
334			 *
335			 * Note that the tracer may also just change
336			 * regs->gr[20] to an invalid syscall number,
337			 * that is handled by tracesys_next.
338			 */
339			regs->gr[20] = -1UL;
340			return -1;
341		}
342	}
343
344	/* Do the secure computing check after ptrace. */
345	if (secure_computing(NULL) == -1)
346		return -1;
347
348#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
349	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
350		trace_sys_enter(regs, regs->gr[20]);
351#endif
352
353#ifdef CONFIG_64BIT
354	if (!is_compat_task())
355		audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25],
356				    regs->gr[24], regs->gr[23]);
357	else
358#endif
359		audit_syscall_entry(regs->gr[20] & 0xffffffff,
360			regs->gr[26] & 0xffffffff,
361			regs->gr[25] & 0xffffffff,
362			regs->gr[24] & 0xffffffff,
363			regs->gr[23] & 0xffffffff);
364
365	/*
366	 * Sign extend the syscall number to 64bit since it may have been
367	 * modified by a compat ptrace call
368	 */
369	return (int) ((u32) regs->gr[20]);
370}
371
372void do_syscall_trace_exit(struct pt_regs *regs)
373{
374	int stepping = test_thread_flag(TIF_SINGLESTEP) ||
375		test_thread_flag(TIF_BLOCKSTEP);
376
377	audit_syscall_exit(regs);
378
379#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
380	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
381		trace_sys_exit(regs, regs->gr[20]);
382#endif
383
384	if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
385		tracehook_report_syscall_exit(regs, stepping);
386}
387
388
389/*
390 * regset functions.
391 */
392
393static int fpr_get(struct task_struct *target,
394		     const struct user_regset *regset,
395		     unsigned int pos, unsigned int count,
396		     void *kbuf, void __user *ubuf)
397{
398	struct pt_regs *regs = task_regs(target);
399	__u64 *k = kbuf;
400	__u64 __user *u = ubuf;
401	__u64 reg;
402
403	pos /= sizeof(reg);
404	count /= sizeof(reg);
405
406	if (kbuf)
407		for (; count > 0 && pos < ELF_NFPREG; --count)
408			*k++ = regs->fr[pos++];
409	else
410		for (; count > 0 && pos < ELF_NFPREG; --count)
411			if (__put_user(regs->fr[pos++], u++))
412				return -EFAULT;
413
414	kbuf = k;
415	ubuf = u;
416	pos *= sizeof(reg);
417	count *= sizeof(reg);
418	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
419					ELF_NFPREG * sizeof(reg), -1);
420}
421
422static int fpr_set(struct task_struct *target,
423		     const struct user_regset *regset,
424		     unsigned int pos, unsigned int count,
425		     const void *kbuf, const void __user *ubuf)
426{
427	struct pt_regs *regs = task_regs(target);
428	const __u64 *k = kbuf;
429	const __u64 __user *u = ubuf;
430	__u64 reg;
431
432	pos /= sizeof(reg);
433	count /= sizeof(reg);
434
435	if (kbuf)
436		for (; count > 0 && pos < ELF_NFPREG; --count)
437			regs->fr[pos++] = *k++;
438	else
439		for (; count > 0 && pos < ELF_NFPREG; --count) {
440			if (__get_user(reg, u++))
441				return -EFAULT;
442			regs->fr[pos++] = reg;
443		}
444
445	kbuf = k;
446	ubuf = u;
447	pos *= sizeof(reg);
448	count *= sizeof(reg);
449	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
450					 ELF_NFPREG * sizeof(reg), -1);
451}
452
453#define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long))
454
455static unsigned long get_reg(struct pt_regs *regs, int num)
456{
457	switch (num) {
458	case RI(gr[0]) ... RI(gr[31]):	return regs->gr[num - RI(gr[0])];
459	case RI(sr[0]) ... RI(sr[7]):	return regs->sr[num - RI(sr[0])];
460	case RI(iasq[0]):		return regs->iasq[0];
461	case RI(iasq[1]):		return regs->iasq[1];
462	case RI(iaoq[0]):		return regs->iaoq[0];
463	case RI(iaoq[1]):		return regs->iaoq[1];
464	case RI(sar):			return regs->sar;
465	case RI(iir):			return regs->iir;
466	case RI(isr):			return regs->isr;
467	case RI(ior):			return regs->ior;
468	case RI(ipsw):			return regs->ipsw;
469	case RI(cr27):			return regs->cr27;
470	case RI(cr0):			return mfctl(0);
471	case RI(cr24):			return mfctl(24);
472	case RI(cr25):			return mfctl(25);
473	case RI(cr26):			return mfctl(26);
474	case RI(cr28):			return mfctl(28);
475	case RI(cr29):			return mfctl(29);
476	case RI(cr30):			return mfctl(30);
477	case RI(cr31):			return mfctl(31);
478	case RI(cr8):			return mfctl(8);
479	case RI(cr9):			return mfctl(9);
480	case RI(cr12):			return mfctl(12);
481	case RI(cr13):			return mfctl(13);
482	case RI(cr10):			return mfctl(10);
483	case RI(cr15):			return mfctl(15);
484	default:			return 0;
485	}
486}
487
488static void set_reg(struct pt_regs *regs, int num, unsigned long val)
489{
490	switch (num) {
491	case RI(gr[0]): /*
492			 * PSW is in gr[0].
493			 * Allow writing to Nullify, Divide-step-correction,
494			 * and carry/borrow bits.
495			 * BEWARE, if you set N, and then single step, it won't
496			 * stop on the nullified instruction.
497			 */
498			val &= USER_PSW_BITS;
499			regs->gr[0] &= ~USER_PSW_BITS;
500			regs->gr[0] |= val;
501			return;
502	case RI(gr[1]) ... RI(gr[31]):
503			regs->gr[num - RI(gr[0])] = val;
504			return;
505	case RI(iaoq[0]):
506	case RI(iaoq[1]):
507			/* set 2 lowest bits to ensure userspace privilege: */
508			regs->iaoq[num - RI(iaoq[0])] = val | 3;
509			return;
510	case RI(sar):	regs->sar = val;
511			return;
512	default:	return;
513#if 0
514	/* do not allow to change any of the following registers (yet) */
515	case RI(sr[0]) ... RI(sr[7]):	return regs->sr[num - RI(sr[0])];
516	case RI(iasq[0]):		return regs->iasq[0];
517	case RI(iasq[1]):		return regs->iasq[1];
518	case RI(iir):			return regs->iir;
519	case RI(isr):			return regs->isr;
520	case RI(ior):			return regs->ior;
521	case RI(ipsw):			return regs->ipsw;
522	case RI(cr27):			return regs->cr27;
523        case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31;
524        case cr8, cr9, cr12, cr13, cr10, cr15;
525#endif
526	}
527}
528
529static int gpr_get(struct task_struct *target,
530		     const struct user_regset *regset,
531		     unsigned int pos, unsigned int count,
532		     void *kbuf, void __user *ubuf)
533{
534	struct pt_regs *regs = task_regs(target);
535	unsigned long *k = kbuf;
536	unsigned long __user *u = ubuf;
537	unsigned long reg;
538
539	pos /= sizeof(reg);
540	count /= sizeof(reg);
541
542	if (kbuf)
543		for (; count > 0 && pos < ELF_NGREG; --count)
544			*k++ = get_reg(regs, pos++);
545	else
546		for (; count > 0 && pos < ELF_NGREG; --count)
547			if (__put_user(get_reg(regs, pos++), u++))
548				return -EFAULT;
549	kbuf = k;
550	ubuf = u;
551	pos *= sizeof(reg);
552	count *= sizeof(reg);
553	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
554					ELF_NGREG * sizeof(reg), -1);
555}
556
557static int gpr_set(struct task_struct *target,
558		     const struct user_regset *regset,
559		     unsigned int pos, unsigned int count,
560		     const void *kbuf, const void __user *ubuf)
561{
562	struct pt_regs *regs = task_regs(target);
563	const unsigned long *k = kbuf;
564	const unsigned long __user *u = ubuf;
565	unsigned long reg;
566
567	pos /= sizeof(reg);
568	count /= sizeof(reg);
569
570	if (kbuf)
571		for (; count > 0 && pos < ELF_NGREG; --count)
572			set_reg(regs, pos++, *k++);
573	else
574		for (; count > 0 && pos < ELF_NGREG; --count) {
575			if (__get_user(reg, u++))
576				return -EFAULT;
577			set_reg(regs, pos++, reg);
578		}
579
580	kbuf = k;
581	ubuf = u;
582	pos *= sizeof(reg);
583	count *= sizeof(reg);
584	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
585					 ELF_NGREG * sizeof(reg), -1);
586}
587
588static const struct user_regset native_regsets[] = {
589	[REGSET_GENERAL] = {
590		.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
591		.size = sizeof(long), .align = sizeof(long),
592		.get = gpr_get, .set = gpr_set
593	},
594	[REGSET_FP] = {
595		.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
596		.size = sizeof(__u64), .align = sizeof(__u64),
597		.get = fpr_get, .set = fpr_set
598	}
599};
600
601static const struct user_regset_view user_parisc_native_view = {
602	.name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX,
603	.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
604};
605
606#ifdef CONFIG_64BIT
607#include <linux/compat.h>
608
609static int gpr32_get(struct task_struct *target,
610		     const struct user_regset *regset,
611		     unsigned int pos, unsigned int count,
612		     void *kbuf, void __user *ubuf)
613{
614	struct pt_regs *regs = task_regs(target);
615	compat_ulong_t *k = kbuf;
616	compat_ulong_t __user *u = ubuf;
617	compat_ulong_t reg;
618
619	pos /= sizeof(reg);
620	count /= sizeof(reg);
621
622	if (kbuf)
623		for (; count > 0 && pos < ELF_NGREG; --count)
624			*k++ = get_reg(regs, pos++);
625	else
626		for (; count > 0 && pos < ELF_NGREG; --count)
627			if (__put_user((compat_ulong_t) get_reg(regs, pos++), u++))
628				return -EFAULT;
629
630	kbuf = k;
631	ubuf = u;
632	pos *= sizeof(reg);
633	count *= sizeof(reg);
634	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
635					ELF_NGREG * sizeof(reg), -1);
636}
637
638static int gpr32_set(struct task_struct *target,
639		     const struct user_regset *regset,
640		     unsigned int pos, unsigned int count,
641		     const void *kbuf, const void __user *ubuf)
642{
643	struct pt_regs *regs = task_regs(target);
644	const compat_ulong_t *k = kbuf;
645	const compat_ulong_t __user *u = ubuf;
646	compat_ulong_t reg;
647
648	pos /= sizeof(reg);
649	count /= sizeof(reg);
650
651	if (kbuf)
652		for (; count > 0 && pos < ELF_NGREG; --count)
653			set_reg(regs, pos++, *k++);
654	else
655		for (; count > 0 && pos < ELF_NGREG; --count) {
656			if (__get_user(reg, u++))
657				return -EFAULT;
658			set_reg(regs, pos++, reg);
659		}
660
661	kbuf = k;
662	ubuf = u;
663	pos *= sizeof(reg);
664	count *= sizeof(reg);
665	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
666					 ELF_NGREG * sizeof(reg), -1);
667}
668
669/*
670 * These are the regset flavors matching the 32bit native set.
671 */
672static const struct user_regset compat_regsets[] = {
673	[REGSET_GENERAL] = {
674		.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
675		.size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
676		.get = gpr32_get, .set = gpr32_set
677	},
678	[REGSET_FP] = {
679		.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
680		.size = sizeof(__u64), .align = sizeof(__u64),
681		.get = fpr_get, .set = fpr_set
682	}
683};
684
685static const struct user_regset_view user_parisc_compat_view = {
686	.name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX,
687	.regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
688};
689#endif	/* CONFIG_64BIT */
690
691const struct user_regset_view *task_user_regset_view(struct task_struct *task)
692{
693	BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG);
694	BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG);
695#ifdef CONFIG_64BIT
696	if (is_compat_task())
697		return &user_parisc_compat_view;
698#endif
699	return &user_parisc_native_view;
700}
701
702
703/* HAVE_REGS_AND_STACK_ACCESS_API feature */
704
705struct pt_regs_offset {
706	const char *name;
707	int offset;
708};
709
710#define REG_OFFSET_NAME(r)    {.name = #r, .offset = offsetof(struct pt_regs, r)}
711#define REG_OFFSET_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])}
712#define REG_OFFSET_END {.name = NULL, .offset = 0}
713
714static const struct pt_regs_offset regoffset_table[] = {
715	REG_OFFSET_INDEX(gr,0),
716	REG_OFFSET_INDEX(gr,1),
717	REG_OFFSET_INDEX(gr,2),
718	REG_OFFSET_INDEX(gr,3),
719	REG_OFFSET_INDEX(gr,4),
720	REG_OFFSET_INDEX(gr,5),
721	REG_OFFSET_INDEX(gr,6),
722	REG_OFFSET_INDEX(gr,7),
723	REG_OFFSET_INDEX(gr,8),
724	REG_OFFSET_INDEX(gr,9),
725	REG_OFFSET_INDEX(gr,10),
726	REG_OFFSET_INDEX(gr,11),
727	REG_OFFSET_INDEX(gr,12),
728	REG_OFFSET_INDEX(gr,13),
729	REG_OFFSET_INDEX(gr,14),
730	REG_OFFSET_INDEX(gr,15),
731	REG_OFFSET_INDEX(gr,16),
732	REG_OFFSET_INDEX(gr,17),
733	REG_OFFSET_INDEX(gr,18),
734	REG_OFFSET_INDEX(gr,19),
735	REG_OFFSET_INDEX(gr,20),
736	REG_OFFSET_INDEX(gr,21),
737	REG_OFFSET_INDEX(gr,22),
738	REG_OFFSET_INDEX(gr,23),
739	REG_OFFSET_INDEX(gr,24),
740	REG_OFFSET_INDEX(gr,25),
741	REG_OFFSET_INDEX(gr,26),
742	REG_OFFSET_INDEX(gr,27),
743	REG_OFFSET_INDEX(gr,28),
744	REG_OFFSET_INDEX(gr,29),
745	REG_OFFSET_INDEX(gr,30),
746	REG_OFFSET_INDEX(gr,31),
747	REG_OFFSET_INDEX(sr,0),
748	REG_OFFSET_INDEX(sr,1),
749	REG_OFFSET_INDEX(sr,2),
750	REG_OFFSET_INDEX(sr,3),
751	REG_OFFSET_INDEX(sr,4),
752	REG_OFFSET_INDEX(sr,5),
753	REG_OFFSET_INDEX(sr,6),
754	REG_OFFSET_INDEX(sr,7),
755	REG_OFFSET_INDEX(iasq,0),
756	REG_OFFSET_INDEX(iasq,1),
757	REG_OFFSET_INDEX(iaoq,0),
758	REG_OFFSET_INDEX(iaoq,1),
759	REG_OFFSET_NAME(cr27),
760	REG_OFFSET_NAME(ksp),
761	REG_OFFSET_NAME(kpc),
762	REG_OFFSET_NAME(sar),
763	REG_OFFSET_NAME(iir),
764	REG_OFFSET_NAME(isr),
765	REG_OFFSET_NAME(ior),
766	REG_OFFSET_NAME(ipsw),
767	REG_OFFSET_END,
768};
769
770/**
771 * regs_query_register_offset() - query register offset from its name
772 * @name:	the name of a register
773 *
774 * regs_query_register_offset() returns the offset of a register in struct
775 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
776 */
777int regs_query_register_offset(const char *name)
778{
779	const struct pt_regs_offset *roff;
780	for (roff = regoffset_table; roff->name != NULL; roff++)
781		if (!strcmp(roff->name, name))
782			return roff->offset;
783	return -EINVAL;
784}
785
786/**
787 * regs_query_register_name() - query register name from its offset
788 * @offset:	the offset of a register in struct pt_regs.
789 *
790 * regs_query_register_name() returns the name of a register from its
791 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
792 */
793const char *regs_query_register_name(unsigned int offset)
794{
795	const struct pt_regs_offset *roff;
796	for (roff = regoffset_table; roff->name != NULL; roff++)
797		if (roff->offset == offset)
798			return roff->name;
799	return NULL;
800}
801
802/**
803 * regs_within_kernel_stack() - check the address in the stack
804 * @regs:      pt_regs which contains kernel stack pointer.
805 * @addr:      address which is checked.
806 *
807 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
808 * If @addr is within the kernel stack, it returns true. If not, returns false.
809 */
810int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
811{
812	return ((addr & ~(THREAD_SIZE - 1))  ==
813		(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
814}
815
816/**
817 * regs_get_kernel_stack_nth() - get Nth entry of the stack
818 * @regs:	pt_regs which contains kernel stack pointer.
819 * @n:		stack entry number.
820 *
821 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
822 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
823 * this returns 0.
824 */
825unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
826{
827	unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
828
829	addr -= n;
830
831	if (!regs_within_kernel_stack(regs, (unsigned long)addr))
832		return 0;
833
834	return *addr;
835}