signal_32.c 34.5 KB
Newer Older
L
Linus Torvalds 已提交
1
/*
2
 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
L
Linus Torvalds 已提交
3
 *
4 5
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
L
Linus Torvalds 已提交
6 7 8 9
 * Copyright (C) 2001 IBM
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
 *
10 11 12
 *  Derived from "arch/i386/kernel/signal.c"
 *    Copyright (C) 1991, 1992 Linus Torvalds
 *    1997-11-28  Modified for POSIX.1b signals by Richard Henderson
L
Linus Torvalds 已提交
13
 *
14 15 16 17
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
L
Linus Torvalds 已提交
18 19 20 21
 */

#include <linux/config.h>
#include <linux/sched.h>
22
#include <linux/mm.h>
L
Linus Torvalds 已提交
23 24 25 26 27 28
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/elf.h>
29 30
#ifdef CONFIG_PPC64
#include <linux/syscalls.h>
L
Linus Torvalds 已提交
31 32
#include <linux/compat.h>
#include <linux/ptrace.h>
33 34 35 36 37 38 39 40 41 42
#else
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
#include <linux/suspend.h>
#endif

L
Linus Torvalds 已提交
43
#include <asm/uaccess.h>
44 45 46
#include <asm/cacheflush.h>
#ifdef CONFIG_PPC64
#include <asm/ppc32.h>
L
Linus Torvalds 已提交
47 48 49
#include <asm/ppcdebug.h>
#include <asm/unistd.h>
#include <asm/vdso.h>
50 51 52 53
#else
#include <asm/ucontext.h>
#include <asm/pgtable.h>
#endif
L
Linus Torvalds 已提交
54

55
#undef DEBUG_SIG
L
Linus Torvalds 已提交
56 57 58

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

59 60
#ifdef CONFIG_PPC64
#define do_signal	do_signal32
61 62 63 64 65 66
#define sys_sigsuspend	compat_sys_sigsuspend
#define sys_rt_sigsuspend	compat_sys_rt_sigsuspend
#define sys_rt_sigreturn	compat_sys_rt_sigreturn
#define sys_sigaction	compat_sys_sigaction
#define sys_swapcontext	compat_sys_swapcontext
#define sys_sigreturn	compat_sys_sigreturn
67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336

#define old_sigaction	old_sigaction32
#define sigcontext	sigcontext32
#define mcontext	mcontext32
#define ucontext	ucontext32

/*
 * Returning 0 means we return to userspace via
 * ret_from_except and thus restore all user
 * registers from *regs.  This is what we need
 * to do when a signal has been delivered.
 */
#define sigreturn_exit(regs)	return 0

#define GP_REGS_SIZE	min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
#undef __SIGNAL_FRAMESIZE
#define __SIGNAL_FRAMESIZE	__SIGNAL_FRAMESIZE32
#undef ELF_NVRREG
#define ELF_NVRREG	ELF_NVRREG32

/*
 * Functions for flipping sigsets (thanks to brain dead generic
 * implementation that makes things simple for little endian only)
 */
static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
{
	compat_sigset_t	cset;

	switch (_NSIG_WORDS) {
	case 4: cset.sig[5] = set->sig[3] & 0xffffffffull;
		cset.sig[7] = set->sig[3] >> 32;
	case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
		cset.sig[5] = set->sig[2] >> 32;
	case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
		cset.sig[3] = set->sig[1] >> 32;
	case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
		cset.sig[1] = set->sig[0] >> 32;
	}
	return copy_to_user(uset, &cset, sizeof(*uset));
}

static inline int get_sigset_t(sigset_t *set, compat_sigset_t __user *uset)
{
	compat_sigset_t s32;

	if (copy_from_user(&s32, uset, sizeof(*uset)))
		return -EFAULT;

	/*
	 * Swap the 2 words of the 64-bit sigset_t (they are stored
	 * in the "wrong" endian in 32-bit user storage).
	 */
	switch (_NSIG_WORDS) {
	case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
	case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
	case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
	case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
	}
	return 0;
}

static inline int get_old_sigaction(struct k_sigaction *new_ka,
		struct old_sigaction __user *act)
{
	compat_old_sigset_t mask;
	compat_uptr_t handler, restorer;

	if (get_user(handler, &act->sa_handler) ||
	    __get_user(restorer, &act->sa_restorer) ||
	    __get_user(new_ka->sa.sa_flags, &act->sa_flags) ||
	    __get_user(mask, &act->sa_mask))
		return -EFAULT;
	new_ka->sa.sa_handler = compat_ptr(handler);
	new_ka->sa.sa_restorer = compat_ptr(restorer);
	siginitset(&new_ka->sa.sa_mask, mask);
	return 0;
}

static inline compat_uptr_t to_user_ptr(void *kp)
{
	return (compat_uptr_t)(u64)kp;
}

#define from_user_ptr(p)	compat_ptr(p)

static inline int save_general_regs(struct pt_regs *regs,
		struct mcontext __user *frame)
{
	elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
	int i;

	for (i = 0; i <= PT_RESULT; i ++)
		if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
			return -EFAULT;
	return 0;
}

static inline int restore_general_regs(struct pt_regs *regs,
		struct mcontext __user *sr)
{
	elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
	int i;

	for (i = 0; i <= PT_RESULT; i++) {
		if ((i == PT_MSR) || (i == PT_SOFTE))
			continue;
		if (__get_user(gregs[i], &sr->mc_gregs[i]))
			return -EFAULT;
	}
	return 0;
}

#else /* CONFIG_PPC64 */

extern void sigreturn_exit(struct pt_regs *);

#define GP_REGS_SIZE	min(sizeof(elf_gregset_t), sizeof(struct pt_regs))

static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
{
	return copy_to_user(uset, set, sizeof(*uset));
}

static inline int get_sigset_t(sigset_t *set, sigset_t __user *uset)
{
	return copy_from_user(set, uset, sizeof(*uset));
}

static inline int get_old_sigaction(struct k_sigaction *new_ka,
		struct old_sigaction __user *act)
{
	old_sigset_t mask;

	if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
			__get_user(new_ka->sa.sa_handler, &act->sa_handler) ||
			__get_user(new_ka->sa.sa_restorer, &act->sa_restorer))
		return -EFAULT;
	__get_user(new_ka->sa.sa_flags, &act->sa_flags);
	__get_user(mask, &act->sa_mask);
	siginitset(&new_ka->sa.sa_mask, mask);
	return 0;
}

#define to_user_ptr(p)		(p)
#define from_user_ptr(p)	(p)

static inline int save_general_regs(struct pt_regs *regs,
		struct mcontext __user *frame)
{
	return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
}

static inline int restore_general_regs(struct pt_regs *regs,
		struct mcontext __user *sr)
{
	/* copy up to but not including MSR */
	if (__copy_from_user(regs, &sr->mc_gregs,
				PT_MSR * sizeof(elf_greg_t)))
		return -EFAULT;
	/* copy from orig_r3 (the word after the MSR) up to the end */
	if (__copy_from_user(&regs->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
				GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
		return -EFAULT;
	return 0;
}

#endif /* CONFIG_PPC64 */

int do_signal(sigset_t *oldset, struct pt_regs *regs);

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */
long sys_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7,
	       struct pt_regs *regs)
{
	sigset_t saveset;

	mask &= _BLOCKABLE;
	spin_lock_irq(&current->sighand->siglock);
	saveset = current->blocked;
	siginitset(&current->blocked, mask);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	regs->result = -EINTR;
	regs->gpr[3] = EINTR;
	regs->ccr |= 0x10000000;
	while (1) {
		current->state = TASK_INTERRUPTIBLE;
		schedule();
		if (do_signal(&saveset, regs))
			sigreturn_exit(regs);
	}
}

long sys_rt_sigsuspend(
#ifdef CONFIG_PPC64
		compat_sigset_t __user *unewset,
#else
		sigset_t __user *unewset,
#endif
		size_t sigsetsize, int p3, int p4,
		int p6, int p7, struct pt_regs *regs)
{
	sigset_t saveset, newset;

	/* XXX: Don't preclude handling different sized sigset_t's.  */
	if (sigsetsize != sizeof(sigset_t))
		return -EINVAL;

	if (get_sigset_t(&newset, unewset))
		return -EFAULT;
	sigdelsetmask(&newset, ~_BLOCKABLE);

	spin_lock_irq(&current->sighand->siglock);
	saveset = current->blocked;
	current->blocked = newset;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	regs->result = -EINTR;
	regs->gpr[3] = EINTR;
	regs->ccr |= 0x10000000;
	while (1) {
		current->state = TASK_INTERRUPTIBLE;
		schedule();
		if (do_signal(&saveset, regs))
			sigreturn_exit(regs);
	}
}

#ifdef CONFIG_PPC32
long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5,
		int r6, int r7, int r8, struct pt_regs *regs)
{
	return do_sigaltstack(uss, uoss, regs->gpr[1]);
}
#endif

long sys_sigaction(int sig, struct old_sigaction __user *act,
		struct old_sigaction __user *oact)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

#ifdef CONFIG_PPC64
	if (sig < 0)
		sig = -sig;
#endif

	if (act) {
		if (get_old_sigaction(&new_ka, act))
			return -EFAULT;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	if (!ret && oact) {
		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
		    __put_user(to_user_ptr(old_ka.sa.sa_handler),
			    &oact->sa_handler) ||
		    __put_user(to_user_ptr(old_ka.sa.sa_restorer),
			    &oact->sa_restorer) ||
		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
			return -EFAULT;
	}

	return ret;
}
L
Linus Torvalds 已提交
337 338 339 340

/*
 * When we have signals to deliver, we set up on the
 * user stack, going down from the original stack pointer:
341 342 343
 *	a sigregs struct
 *	a sigcontext struct
 *	a gap of __SIGNAL_FRAMESIZE bytes
L
Linus Torvalds 已提交
344 345 346 347
 *
 * Each of these things must be a multiple of 16 bytes in size.
 *
 */
348 349
struct sigregs {
	struct mcontext	mctx;		/* all the register values */
L
Linus Torvalds 已提交
350 351 352 353 354 355 356 357 358 359 360 361 362
	/*
	 * Programs using the rs6000/xcoff abi can save up to 19 gp
	 * regs and 18 fp regs below sp before decrementing it.
	 */
	int			abigap[56];
};

/* We use the mc_pad field for the signal return trampoline. */
#define tramp	mc_pad

/*
 *  When we have rt signals to deliver, we set up on the
 *  user stack, going down from the original stack pointer:
363 364 365
 *	one rt_sigframe struct (siginfo + ucontext + ABI gap)
 *	a gap of __SIGNAL_FRAMESIZE+16 bytes
 *  (the +16 is to get the siginfo and ucontext in the same
L
Linus Torvalds 已提交
366 367 368 369 370
 *  positions as in older kernels).
 *
 *  Each of these things must be a multiple of 16 bytes in size.
 *
 */
371 372 373 374 375 376 377
struct rt_sigframe {
#ifdef CONFIG_PPC64
	compat_siginfo_t info;
#else
	struct siginfo info;
#endif
	struct ucontext	uc;
L
Linus Torvalds 已提交
378 379 380 381 382 383 384 385 386
	/*
	 * Programs using the rs6000/xcoff abi can save up to 19 gp
	 * regs and 18 fp regs below sp before decrementing it.
	 */
	int			abigap[56];
};

/*
 * Save the current user registers on the user stack.
387 388
 * We only save the altivec/spe registers if the process has used
 * altivec/spe instructions at some point.
L
Linus Torvalds 已提交
389
 */
390 391
static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
		int sigret)
L
Linus Torvalds 已提交
392
{
393 394 395
#ifdef CONFIG_PPC32
	CHECK_FULL_REGS(regs);
#endif
L
Linus Torvalds 已提交
396 397 398 399
	/* Make sure floating point registers are stored in regs */
	flush_fp_to_thread(current);

	/* save general and floating-point registers */
400 401 402
	if (save_general_regs(regs, frame) ||
	    __copy_to_user(&frame->mc_fregs, current->thread.fpr,
		    ELF_NFPREG * sizeof(double)))
L
Linus Torvalds 已提交
403 404 405 406 407 408 409 410 411
		return 1;

	current->thread.fpscr = 0;	/* turn off all fp exceptions */

#ifdef CONFIG_ALTIVEC
	/* save altivec registers */
	if (current->thread.used_vr) {
		flush_altivec_to_thread(current);
		if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
412
				   ELF_NVRREG * sizeof(vector128)))
L
Linus Torvalds 已提交
413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429
			return 1;
		/* set MSR_VEC in the saved MSR value to indicate that
		   frame->mc_vregs contains valid data */
		if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR]))
			return 1;
	}
	/* else assert((regs->msr & MSR_VEC) == 0) */

	/* We always copy to/from vrsave, it's 0 if we don't have or don't
	 * use altivec. Since VSCR only contains 32 bits saved in the least
	 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
	 * most significant bits of that same vector. --BenH
	 */
	if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
		return 1;
#endif /* CONFIG_ALTIVEC */

430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448
#ifdef CONFIG_SPE
	/* save spe registers */
	if (current->thread.used_spe) {
		flush_spe_to_thread(current);
		if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
				   ELF_NEVRREG * sizeof(u32)))
			return 1;
		/* set MSR_SPE in the saved MSR value to indicate that
		   frame->mc_vregs contains valid data */
		if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR]))
			return 1;
	}
	/* else assert((regs->msr & MSR_SPE) == 0) */

	/* We always copy to/from spefscr */
	if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
		return 1;
#endif /* CONFIG_SPE */

L
Linus Torvalds 已提交
449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
	if (sigret) {
		/* Set up the sigreturn trampoline: li r0,sigret; sc */
		if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
		    || __put_user(0x44000002UL, &frame->tramp[1]))
			return 1;
		flush_icache_range((unsigned long) &frame->tramp[0],
				   (unsigned long) &frame->tramp[2]);
	}

	return 0;
}

/*
 * Restore the current user register values from the user stack,
 * (except for MSR).
 */
static long restore_user_regs(struct pt_regs *regs,
466
			      struct mcontext __user *sr, int sig)
L
Linus Torvalds 已提交
467
{
468
	long err;
L
Linus Torvalds 已提交
469
	unsigned int save_r2 = 0;
470
#if defined(CONFIG_ALTIVEC) || defined(CONFIG_SPE)
L
Linus Torvalds 已提交
471 472 473 474 475 476 477 478 479
	unsigned long msr;
#endif

	/*
	 * restore general registers but not including MSR or SOFTE. Also
	 * take care of keeping r2 (TLS) intact if not a signal
	 */
	if (!sig)
		save_r2 = (unsigned int)regs->gpr[2];
480
	err = restore_general_regs(regs, sr);
L
Linus Torvalds 已提交
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502
	if (!sig)
		regs->gpr[2] = (unsigned long) save_r2;
	if (err)
		return 1;

	/* force the process to reload the FP registers from
	   current->thread when it next does FP instructions */
	regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
	if (__copy_from_user(current->thread.fpr, &sr->mc_fregs,
			     sizeof(sr->mc_fregs)))
		return 1;

#ifdef CONFIG_ALTIVEC
	/* force the process to reload the altivec registers from
	   current->thread when it next does altivec instructions */
	regs->msr &= ~MSR_VEC;
	if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) {
		/* restore altivec registers from the stack */
		if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
				     sizeof(sr->mc_vregs)))
			return 1;
	} else if (current->thread.used_vr)
503
		memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
L
Linus Torvalds 已提交
504 505 506 507 508 509

	/* Always get VRSAVE back */
	if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
		return 1;
#endif /* CONFIG_ALTIVEC */

510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526
#ifdef CONFIG_SPE
	/* force the process to reload the spe registers from
	   current->thread when it next does spe instructions */
	regs->msr &= ~MSR_SPE;
	if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_SPE) != 0) {
		/* restore spe registers from the stack */
		if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
				     ELF_NEVRREG * sizeof(u32)))
			return 1;
	} else if (current->thread.used_spe)
		memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));

	/* Always get SPEFSCR back */
	if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
		return 1;
#endif /* CONFIG_SPE */

L
Linus Torvalds 已提交
527 528 529 530 531 532
#ifndef CONFIG_SMP
	preempt_disable();
	if (last_task_used_math == current)
		last_task_used_math = NULL;
	if (last_task_used_altivec == current)
		last_task_used_altivec = NULL;
533 534 535 536
#ifdef CONFIG_SPE
	if (last_task_used_spe == current)
		last_task_used_spe = NULL;
#endif
L
Linus Torvalds 已提交
537 538 539 540 541
	preempt_enable();
#endif
	return 0;
}

542
#ifdef CONFIG_PPC64
543
long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act,
L
Linus Torvalds 已提交
544 545 546 547 548 549 550 551 552 553 554 555 556 557
		struct sigaction32 __user *oact, size_t sigsetsize)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

	/* XXX: Don't preclude handling different sized sigset_t's.  */
	if (sigsetsize != sizeof(compat_sigset_t))
		return -EINVAL;

	if (act) {
		compat_uptr_t handler;

		ret = get_user(handler, &act->sa_handler);
		new_ka.sa.sa_handler = compat_ptr(handler);
558
		ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
L
Linus Torvalds 已提交
559 560 561 562 563 564 565 566
		ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
		if (ret)
			return -EFAULT;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	if (!ret && oact) {
		ret = put_user((long)old_ka.sa.sa_handler, &oact->sa_handler);
567
		ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
L
Linus Torvalds 已提交
568 569 570 571 572 573 574 575 576 577 578 579
		ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	}
	return ret;
}

/*
 * Note: it is necessary to treat how as an unsigned int, with the
 * corresponding cast to a signed int to insure that the proper
 * conversion (sign extension) between the register representation
 * of a signed int (msr in 32-bit mode) and the register representation
 * of a signed int (msr in 64-bit mode) is performed.
 */
580
long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
L
Linus Torvalds 已提交
581 582 583 584 585 586 587 588
		compat_sigset_t __user *oset, size_t sigsetsize)
{
	sigset_t s;
	sigset_t __user *up;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (set) {
589 590
		if (get_sigset_t(&s, set))
			return -EFAULT;
L
Linus Torvalds 已提交
591
	}
592

L
Linus Torvalds 已提交
593 594 595 596
	set_fs(KERNEL_DS);
	/* This is valid because of the set_fs() */
	up = (sigset_t __user *) &s;
	ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
597
				 sigsetsize);
L
Linus Torvalds 已提交
598 599 600 601
	set_fs(old_fs);
	if (ret)
		return ret;
	if (oset) {
602
		if (put_sigset_t(oset, &s))
L
Linus Torvalds 已提交
603 604 605 606 607
			return -EFAULT;
	}
	return 0;
}

608
long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
L
Linus Torvalds 已提交
609 610 611 612 613 614 615 616 617 618
{
	sigset_t s;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	/* The __user pointer cast is valid because of the set_fs() */
	ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
	set_fs(old_fs);
	if (!ret) {
619
		if (put_sigset_t(set, &s))
L
Linus Torvalds 已提交
620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680
			return -EFAULT;
	}
	return ret;
}


int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
{
	int err;

	if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
		return -EFAULT;

	/* If you change siginfo_t structure, please be sure
	 * this code is fixed accordingly.
	 * It should never copy any pad contained in the structure
	 * to avoid security leaks, but must copy the generic
	 * 3 ints plus the relevant union member.
	 * This routine must convert siginfo from 64bit to 32bit as well
	 * at the same time.
	 */
	err = __put_user(s->si_signo, &d->si_signo);
	err |= __put_user(s->si_errno, &d->si_errno);
	err |= __put_user((short)s->si_code, &d->si_code);
	if (s->si_code < 0)
		err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
				      SI_PAD_SIZE32);
	else switch(s->si_code >> 16) {
	case __SI_CHLD >> 16:
		err |= __put_user(s->si_pid, &d->si_pid);
		err |= __put_user(s->si_uid, &d->si_uid);
		err |= __put_user(s->si_utime, &d->si_utime);
		err |= __put_user(s->si_stime, &d->si_stime);
		err |= __put_user(s->si_status, &d->si_status);
		break;
	case __SI_FAULT >> 16:
		err |= __put_user((unsigned int)(unsigned long)s->si_addr,
				  &d->si_addr);
		break;
	case __SI_POLL >> 16:
		err |= __put_user(s->si_band, &d->si_band);
		err |= __put_user(s->si_fd, &d->si_fd);
		break;
	case __SI_TIMER >> 16:
		err |= __put_user(s->si_tid, &d->si_tid);
		err |= __put_user(s->si_overrun, &d->si_overrun);
		err |= __put_user(s->si_int, &d->si_int);
		break;
	case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
	case __SI_MESGQ >> 16:
		err |= __put_user(s->si_int, &d->si_int);
		/* fallthrough */
	case __SI_KILL >> 16:
	default:
		err |= __put_user(s->si_pid, &d->si_pid);
		err |= __put_user(s->si_uid, &d->si_uid);
		break;
	}
	return err;
}

681 682
#define copy_siginfo_to_user	copy_siginfo_to_user32

L
Linus Torvalds 已提交
683 684 685 686 687 688 689
/*
 * Note: it is necessary to treat pid and sig as unsigned ints, with the
 * corresponding cast to a signed int to insure that the proper conversion
 * (sign extension) between the register representation of a signed int
 * (msr in 32-bit mode) and the register representation of a signed int
 * (msr in 64-bit mode) is performed.
 */
690
long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
L
Linus Torvalds 已提交
691 692 693 694
{
	siginfo_t info;
	int ret;
	mm_segment_t old_fs = get_fs();
695

L
Linus Torvalds 已提交
696 697 698 699 700 701 702 703 704 705 706 707 708
	if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
	    copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32))
		return -EFAULT;
	set_fs (KERNEL_DS);
	/* The __user pointer cast is valid becasuse of the set_fs() */
	ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
	set_fs (old_fs);
	return ret;
}
/*
 *  Start Alternate signal stack support
 *
 *  System Calls
709
 *       sigaltatck               compat_sys_sigaltstack
L
Linus Torvalds 已提交
710 711
 */

712
int compat_sys_sigaltstack(u32 __new, u32 __old, int r5,
L
Linus Torvalds 已提交
713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
		      int r6, int r7, int r8, struct pt_regs *regs)
{
	stack_32_t __user * newstack = (stack_32_t __user *)(long) __new;
	stack_32_t __user * oldstack = (stack_32_t __user *)(long) __old;
	stack_t uss, uoss;
	int ret;
	mm_segment_t old_fs;
	unsigned long sp;
	compat_uptr_t ss_sp;

	/*
	 * set sp to the user stack on entry to the system call
	 * the system call router sets R9 to the saved registers
	 */
	sp = regs->gpr[1];

	/* Put new stack info in local 64 bit stack struct */
	if (newstack) {
		if (get_user(ss_sp, &newstack->ss_sp) ||
		    __get_user(uss.ss_flags, &newstack->ss_flags) ||
		    __get_user(uss.ss_size, &newstack->ss_size))
			return -EFAULT;
		uss.ss_sp = compat_ptr(ss_sp);
	}

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	/* The __user pointer casts are valid because of the set_fs() */
	ret = do_sigaltstack(
		newstack ? (stack_t __user *) &uss : NULL,
		oldstack ? (stack_t __user *) &uoss : NULL,
		sp);
	set_fs(old_fs);
	/* Copy the stack information to the user output buffer */
	if (!ret && oldstack  &&
		(put_user((long)uoss.ss_sp, &oldstack->ss_sp) ||
		 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
		 __put_user(uoss.ss_size, &oldstack->ss_size)))
		return -EFAULT;
	return ret;
}
754
#endif /* CONFIG_PPC64 */
L
Linus Torvalds 已提交
755 756


757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
/*
 * Restore the user process's signal mask
 */
#ifdef CONFIG_PPC64
extern void restore_sigmask(sigset_t *set);
#else /* CONFIG_PPC64 */
static void restore_sigmask(sigset_t *set)
{
	sigdelsetmask(set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = *set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);
}
#endif

L
Linus Torvalds 已提交
773 774 775 776
/*
 * Set up a signal frame for a "real-time" signal handler
 * (one which gets siginfo).
 */
777 778 779
static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka,
		siginfo_t *info, sigset_t *oldset,
		struct pt_regs *regs, unsigned long newsp)
L
Linus Torvalds 已提交
780
{
781 782
	struct rt_sigframe __user *rt_sf;
	struct mcontext __user *frame;
L
Linus Torvalds 已提交
783 784 785 786 787
	unsigned long origsp = newsp;

	/* Set up Signal Frame */
	/* Put a Real Time Context onto stack */
	newsp -= sizeof(*rt_sf);
788
	rt_sf = (struct rt_sigframe __user *)newsp;
L
Linus Torvalds 已提交
789 790

	/* create a stack frame for the caller of the handler */
791
	newsp -= __SIGNAL_FRAMESIZE + 16;
L
Linus Torvalds 已提交
792 793 794 795 796

	if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp))
		goto badframe;

	/* Put the siginfo & fill in most of the ucontext */
797
	if (copy_siginfo_to_user(&rt_sf->info, info)
L
Linus Torvalds 已提交
798 799 800 801 802 803
	    || __put_user(0, &rt_sf->uc.uc_flags)
	    || __put_user(0, &rt_sf->uc.uc_link)
	    || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
	    || __put_user(sas_ss_flags(regs->gpr[1]),
			  &rt_sf->uc.uc_stack.ss_flags)
	    || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
804 805 806
	    || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
		    &rt_sf->uc.uc_regs)
	    || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
L
Linus Torvalds 已提交
807 808 809 810
		goto badframe;

	/* Save user registers on the stack */
	frame = &rt_sf->uc.uc_mcontext;
811
#ifdef CONFIG_PPC64
L
Linus Torvalds 已提交
812 813 814 815
	if (vdso32_rt_sigtramp && current->thread.vdso_base) {
		if (save_user_regs(regs, frame, 0))
			goto badframe;
		regs->link = current->thread.vdso_base + vdso32_rt_sigtramp;
816 817 818
	} else
#endif
	{
L
Linus Torvalds 已提交
819 820 821 822
		if (save_user_regs(regs, frame, __NR_rt_sigreturn))
			goto badframe;
		regs->link = (unsigned long) frame->tramp;
	}
823 824 825
	if (put_user(regs->gpr[1], (unsigned long __user *)newsp))
		goto badframe;
	regs->gpr[1] = newsp;
L
Linus Torvalds 已提交
826 827 828 829 830
	regs->gpr[3] = sig;
	regs->gpr[4] = (unsigned long) &rt_sf->info;
	regs->gpr[5] = (unsigned long) &rt_sf->uc;
	regs->gpr[6] = (unsigned long) rt_sf;
	regs->nip = (unsigned long) ka->sa.sa_handler;
831
	regs->link = (unsigned long) frame->tramp;
L
Linus Torvalds 已提交
832
	regs->trap = 0;
833
#ifdef CONFIG_PPC64
L
Linus Torvalds 已提交
834 835 836 837
	regs->result = 0;

	if (test_thread_flag(TIF_SINGLESTEP))
		ptrace_notify(SIGTRAP);
838
#endif
L
Linus Torvalds 已提交
839 840 841
	return 1;

badframe:
842
#ifdef DEBUG_SIG
L
Linus Torvalds 已提交
843 844 845 846 847 848 849
	printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
	       regs, frame, newsp);
#endif
	force_sigsegv(sig, current);
	return 0;
}

850
static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
L
Linus Torvalds 已提交
851 852
{
	sigset_t set;
853 854 855 856 857 858 859
	struct mcontext __user *mcp;

	if (get_sigset_t(&set, &ucp->uc_sigmask))
		return -EFAULT;
#ifdef CONFIG_PPC64
	{
		u32 cmcp;
L
Linus Torvalds 已提交
860

861 862 863 864 865 866
		if (__get_user(cmcp, &ucp->uc_regs))
			return -EFAULT;
		mcp = (struct mcontext __user *)(u64)cmcp;
	}
#else
	if (__get_user(mcp, &ucp->uc_regs))
L
Linus Torvalds 已提交
867
		return -EFAULT;
868
#endif
L
Linus Torvalds 已提交
869
	restore_sigmask(&set);
870
	if (restore_user_regs(regs, mcp, sig))
L
Linus Torvalds 已提交
871 872 873 874 875
		return -EFAULT;

	return 0;
}

876 877
long sys_swapcontext(struct ucontext __user *old_ctx,
		       struct ucontext __user *new_ctx,
L
Linus Torvalds 已提交
878 879 880 881 882 883 884
		       int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
{
	unsigned char tmp;

	/* Context size is for future use. Right now, we only make sure
	 * we are passed something we understand
	 */
885
	if (ctx_size < sizeof(struct ucontext))
L
Linus Torvalds 已提交
886 887 888 889 890
		return -EINVAL;

	if (old_ctx != NULL) {
		if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
		    || save_user_regs(regs, &old_ctx->uc_mcontext, 0)
891 892 893
		    || put_sigset_t(&old_ctx->uc_sigmask, &current->blocked)
		    || __put_user(to_user_ptr(&old_ctx->uc_mcontext),
			    &old_ctx->uc_regs))
L
Linus Torvalds 已提交
894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
			return -EFAULT;
	}
	if (new_ctx == NULL)
		return 0;
	if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx))
	    || __get_user(tmp, (u8 __user *) new_ctx)
	    || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
		return -EFAULT;

	/*
	 * If we get a fault copying the context into the kernel's
	 * image of the user's registers, we can't just return -EFAULT
	 * because the user's registers will be corrupted.  For instance
	 * the NIP value may have been updated but not some of the
	 * other registers.  Given that we have done the access_ok
	 * and successfully read the first and last bytes of the region
	 * above, this should only happen in an out-of-memory situation
	 * or if another thread unmaps the region containing the context.
	 * We kill the task with a SIGSEGV in this situation.
	 */
914
	if (do_setcontext(new_ctx, regs, 0))
L
Linus Torvalds 已提交
915
		do_exit(SIGSEGV);
916 917
	sigreturn_exit(regs);
	/* doesn't actually return back to here */
L
Linus Torvalds 已提交
918 919 920
	return 0;
}

921
long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
L
Linus Torvalds 已提交
922 923
		     struct pt_regs *regs)
{
924
	struct rt_sigframe __user *rt_sf;
L
Linus Torvalds 已提交
925 926 927 928

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

929 930
	rt_sf = (struct rt_sigframe __user *)
		(regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
L
Linus Torvalds 已提交
931 932
	if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
		goto bad;
933
	if (do_setcontext(&rt_sf->uc, regs, 1))
L
Linus Torvalds 已提交
934 935 936 937 938 939 940 941
		goto bad;

	/*
	 * It's not clear whether or why it is desirable to save the
	 * sigaltstack setting on signal delivery and restore it on
	 * signal return.  But other architectures do this and we have
	 * always done it up until now so it is probably better not to
	 * change it.  -- paulus
942 943 944
	 */
#ifdef CONFIG_PPC64
	/*
945
	 * We use the compat_sys_ version that does the 32/64 bits conversion
L
Linus Torvalds 已提交
946 947 948
	 * and takes userland pointer directly. What about error checking ?
	 * nobody does any...
	 */
949
	compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
950 951 952 953 954 955
	return (int)regs->result;
#else
	do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]);
	sigreturn_exit(regs);		/* doesn't return here */
	return 0;
#endif
L
Linus Torvalds 已提交
956 957 958 959 960 961

 bad:
	force_sig(SIGSEGV, current);
	return 0;
}

962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
#ifdef CONFIG_PPC32
int sys_debug_setcontext(struct ucontext __user *ctx,
			 int ndbg, struct sig_dbg_op __user *dbg,
			 int r6, int r7, int r8,
			 struct pt_regs *regs)
{
	struct sig_dbg_op op;
	int i;
	unsigned long new_msr = regs->msr;
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
	unsigned long new_dbcr0 = current->thread.dbcr0;
#endif

	for (i=0; i<ndbg; i++) {
		if (__copy_from_user(&op, dbg, sizeof(op)))
			return -EFAULT;
		switch (op.dbg_type) {
		case SIG_DBG_SINGLE_STEPPING:
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
			if (op.dbg_value) {
				new_msr |= MSR_DE;
				new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
			} else {
				new_msr &= ~MSR_DE;
				new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC);
			}
#else
			if (op.dbg_value)
				new_msr |= MSR_SE;
			else
				new_msr &= ~MSR_SE;
#endif
			break;
		case SIG_DBG_BRANCH_TRACING:
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
			return -EINVAL;
#else
			if (op.dbg_value)
				new_msr |= MSR_BE;
			else
				new_msr &= ~MSR_BE;
#endif
			break;

		default:
			return -EINVAL;
		}
	}

	/* We wait until here to actually install the values in the
	   registers so if we fail in the above loop, it will not
	   affect the contents of these registers.  After this point,
	   failure is a problem, anyway, and it's very unlikely unless
	   the user is really doing something wrong. */
	regs->msr = new_msr;
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
	current->thread.dbcr0 = new_dbcr0;
#endif

	/*
	 * If we get a fault copying the context into the kernel's
	 * image of the user's registers, we can't just return -EFAULT
	 * because the user's registers will be corrupted.  For instance
	 * the NIP value may have been updated but not some of the
	 * other registers.  Given that we have done the access_ok
	 * and successfully read the first and last bytes of the region
	 * above, this should only happen in an out-of-memory situation
	 * or if another thread unmaps the region containing the context.
	 * We kill the task with a SIGSEGV in this situation.
	 */
	if (do_setcontext(ctx, regs, 1)) {
		force_sig(SIGSEGV, current);
		goto out;
	}

	/*
	 * It's not clear whether or why it is desirable to save the
	 * sigaltstack setting on signal delivery and restore it on
	 * signal return.  But other architectures do this and we have
	 * always done it up until now so it is probably better not to
	 * change it.  -- paulus
	 */
	do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]);

	sigreturn_exit(regs);
	/* doesn't actually return back to here */

 out:
	return 0;
}
#endif
L
Linus Torvalds 已提交
1053 1054 1055 1056

/*
 * OK, we're invoking a handler
 */
1057 1058 1059
static int handle_signal(unsigned long sig, struct k_sigaction *ka,
		siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
		unsigned long newsp)
L
Linus Torvalds 已提交
1060
{
1061 1062
	struct sigcontext __user *sc;
	struct sigregs __user *frame;
L
Linus Torvalds 已提交
1063 1064 1065
	unsigned long origsp = newsp;

	/* Set up Signal Frame */
1066 1067
	newsp -= sizeof(struct sigregs);
	frame = (struct sigregs __user *) newsp;
L
Linus Torvalds 已提交
1068 1069 1070

	/* Put a sigcontext on the stack */
	newsp -= sizeof(*sc);
1071
	sc = (struct sigcontext __user *) newsp;
L
Linus Torvalds 已提交
1072 1073

	/* create a stack frame for the caller of the handler */
1074
	newsp -= __SIGNAL_FRAMESIZE;
L
Linus Torvalds 已提交
1075 1076 1077 1078 1079

	if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp))
		goto badframe;

#if _NSIG != 64
1080
#error "Please adjust handle_signal()"
L
Linus Torvalds 已提交
1081
#endif
1082
	if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
L
Linus Torvalds 已提交
1083
	    || __put_user(oldset->sig[0], &sc->oldmask)
1084
#ifdef CONFIG_PPC64
L
Linus Torvalds 已提交
1085
	    || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
1086 1087 1088 1089
#else
	    || __put_user(oldset->sig[1], &sc->_unused[3])
#endif
	    || __put_user(to_user_ptr(frame), &sc->regs)
L
Linus Torvalds 已提交
1090 1091 1092
	    || __put_user(sig, &sc->signal))
		goto badframe;

1093
#ifdef CONFIG_PPC64
L
Linus Torvalds 已提交
1094 1095 1096 1097
	if (vdso32_sigtramp && current->thread.vdso_base) {
		if (save_user_regs(regs, &frame->mctx, 0))
			goto badframe;
		regs->link = current->thread.vdso_base + vdso32_sigtramp;
1098 1099 1100
	} else
#endif
	{
L
Linus Torvalds 已提交
1101 1102 1103 1104 1105
		if (save_user_regs(regs, &frame->mctx, __NR_sigreturn))
			goto badframe;
		regs->link = (unsigned long) frame->mctx.tramp;
	}

1106
	if (put_user(regs->gpr[1], (u32 __user *)newsp))
L
Linus Torvalds 已提交
1107
		goto badframe;
1108
	regs->gpr[1] = newsp;
L
Linus Torvalds 已提交
1109 1110 1111 1112
	regs->gpr[3] = sig;
	regs->gpr[4] = (unsigned long) sc;
	regs->nip = (unsigned long) ka->sa.sa_handler;
	regs->trap = 0;
1113
#ifdef CONFIG_PPC64
L
Linus Torvalds 已提交
1114 1115 1116 1117
	regs->result = 0;

	if (test_thread_flag(TIF_SINGLESTEP))
		ptrace_notify(SIGTRAP);
1118
#endif
L
Linus Torvalds 已提交
1119 1120 1121 1122

	return 1;

badframe:
1123 1124 1125
#ifdef DEBUG_SIG
	printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
	       regs, frame, newsp);
L
Linus Torvalds 已提交
1126 1127 1128 1129 1130 1131 1132 1133
#endif
	force_sigsegv(sig, current);
	return 0;
}

/*
 * Do a signal return; undo the signal stack.
 */
1134
long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
L
Linus Torvalds 已提交
1135 1136
		       struct pt_regs *regs)
{
1137 1138 1139
	struct sigcontext __user *sc;
	struct sigcontext sigctx;
	struct mcontext __user *sr;
L
Linus Torvalds 已提交
1140 1141 1142 1143 1144
	sigset_t set;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

1145
	sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
L
Linus Torvalds 已提交
1146 1147 1148
	if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
		goto badframe;

1149
#ifdef CONFIG_PPC64
L
Linus Torvalds 已提交
1150 1151 1152 1153 1154
	/*
	 * Note that PPC32 puts the upper 32 bits of the sigmask in the
	 * unused part of the signal stackframe
	 */
	set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
1155 1156 1157 1158
#else
	set.sig[0] = sigctx.oldmask;
	set.sig[1] = sigctx._unused[3];
#endif
L
Linus Torvalds 已提交
1159 1160
	restore_sigmask(&set);

1161
	sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
L
Linus Torvalds 已提交
1162 1163 1164 1165
	if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
	    || restore_user_regs(regs, sr, 1))
		goto badframe;

1166 1167 1168 1169 1170 1171
#ifdef CONFIG_PPC64
	return (int)regs->result;
#else
	sigreturn_exit(regs);		/* doesn't return */
	return 0;
#endif
L
Linus Torvalds 已提交
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182

badframe:
	force_sig(SIGSEGV, current);
	return 0;
}

/*
 * Note that 'init' is a special process: it doesn't get signals it doesn't
 * want to handle. Thus you cannot kill init even with a SIGKILL even by
 * mistake.
 */
1183
int do_signal(sigset_t *oldset, struct pt_regs *regs)
L
Linus Torvalds 已提交
1184 1185
{
	siginfo_t info;
1186
	struct k_sigaction ka;
L
Linus Torvalds 已提交
1187 1188
	unsigned int frame, newsp;
	int signr, ret;
1189 1190 1191 1192 1193 1194 1195 1196

#ifdef CONFIG_PPC32
	if (try_to_freeze()) {
		signr = 0;
		if (!signal_pending(current))
			goto no_signal;
	}
#endif
L
Linus Torvalds 已提交
1197 1198 1199 1200 1201 1202 1203

	if (!oldset)
		oldset = &current->blocked;

	newsp = frame = 0;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1204 1205 1206
#ifdef CONFIG_PPC32
no_signal:
#endif
L
Linus Torvalds 已提交
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
	if (TRAP(regs) == 0x0C00		/* System Call! */
	    && regs->ccr & 0x10000000		/* error signalled */
	    && ((ret = regs->gpr[3]) == ERESTARTSYS
		|| ret == ERESTARTNOHAND || ret == ERESTARTNOINTR
		|| ret == ERESTART_RESTARTBLOCK)) {

		if (signr > 0
		    && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK
			|| (ret == ERESTARTSYS
			    && !(ka.sa.sa_flags & SA_RESTART)))) {
			/* make the system call return an EINTR error */
			regs->result = -EINTR;
			regs->gpr[3] = EINTR;
			/* note that the cr0.SO bit is already set */
		} else {
			regs->nip -= 4;	/* Back up & retry system call */
			regs->result = 0;
			regs->trap = 0;
			if (ret == ERESTART_RESTARTBLOCK)
				regs->gpr[0] = __NR_restart_syscall;
			else
				regs->gpr[3] = regs->orig_gpr3;
		}
	}

	if (signr == 0)
		return 0;		/* no signals delivered */

	if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size
1236 1237
	    && !on_sig_stack(regs->gpr[1]))
		newsp = current->sas_ss_sp + current->sas_ss_size;
L
Linus Torvalds 已提交
1238 1239 1240 1241
	else
		newsp = regs->gpr[1];
	newsp &= ~0xfUL;

1242
#ifdef CONFIG_PPC64
1243 1244 1245 1246 1247 1248 1249
	/*
	 * Reenable the DABR before delivering the signal to
	 * user space. The DABR will have been cleared if it
	 * triggered inside the kernel.
	 */
	if (current->thread.dabr)
		set_dabr(current->thread.dabr);
1250
#endif
1251

L
Linus Torvalds 已提交
1252 1253
	/* Whee!  Actually deliver the signal.  */
	if (ka.sa.sa_flags & SA_SIGINFO)
1254
		ret = handle_rt_signal(signr, &ka, &info, oldset, regs, newsp);
L
Linus Torvalds 已提交
1255
	else
1256
		ret = handle_signal(signr, &ka, &info, oldset, regs, newsp);
L
Linus Torvalds 已提交
1257

1258
	if (ret) {
L
Linus Torvalds 已提交
1259 1260 1261
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked, &current->blocked,
			  &ka.sa.sa_mask);
1262 1263
		if (!(ka.sa.sa_flags & SA_NODEFER))
			sigaddset(&current->blocked, signr);
L
Linus Torvalds 已提交
1264 1265 1266 1267 1268 1269
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}

	return ret;
}