[mirror_ubuntu-artful-kernel.git] / arch / mips / kernel / signal_n32.c

/*
 * Copyright (C) 2003 Broadcom Corporation
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/compat.h>
#include <linux/bitops.h>

#include <asm/asm.h>
#include <asm/cacheflush.h>
#include <asm/sim.h>
#include <asm/uaccess.h>
#include <asm/ucontext.h>
#include <asm/system.h>
#include <asm/fpu.h>
#include <asm/cpu-features.h>
#include <asm/war.h>

#include "signal-common.h"

/*
 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
 */
#define __NR_N32_rt_sigreturn		6211
#define __NR_N32_restart_syscall	6214

extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);


/* IRIX compatible stack_t  */
typedef struct sigaltstack32 {
	s32 ss_sp;
	compat_size_t ss_size;
	int ss_flags;
} stack32_t;

struct ucontextn32 {
	u32                 uc_flags;
	s32                 uc_link;
	stack32_t           uc_stack;
	struct sigcontext   uc_mcontext;
	sigset_t            uc_sigmask;   /* mask last for extensibility */
};

#if ICACHE_REFILLS_WORKAROUND_WAR == 0

struct rt_sigframe_n32 {
	u32 rs_ass[4];			/* argument save space for o32 */
	u32 rs_code[2];			/* signal trampoline */
	struct siginfo rs_info;
	struct ucontextn32 rs_uc;
};

#else  /* ICACHE_REFILLS_WORKAROUND_WAR */

struct rt_sigframe_n32 {
	u32 rs_ass[4];			/* argument save space for o32 */
	u32 rs_pad[2];
	struct siginfo rs_info;
	struct ucontextn32 rs_uc;
	u32 rs_code[8] ____cacheline_aligned;		/* signal trampoline */
};

#endif	/* !ICACHE_REFILLS_WORKAROUND_WAR */

extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat);

asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
	compat_sigset_t __user *unewset;
	compat_sigset_t uset;
	size_t sigsetsize;
	sigset_t newset;

	/* XXX Don't preclude handling different sized sigset_t's.  */
	sigsetsize = regs.regs[5];
	if (sigsetsize != sizeof(sigset_t))
		return -EINVAL;

	unewset = (compat_sigset_t __user *) regs.regs[4];
	if (copy_from_user(&uset, unewset, sizeof(uset)))
		return -EFAULT;
	sigset_from_compat (&newset, &uset);
	sigdelsetmask(&newset, ~_BLOCKABLE);

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

	current->state = TASK_INTERRUPTIBLE;
	schedule();
	set_thread_flag(TIF_RESTORE_SIGMASK);
	return -ERESTARTNOHAND;
}

asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
{
	struct rt_sigframe_n32 __user *frame;
	sigset_t set;
	stack_t st;
	s32 sp;

	frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
		goto badframe;

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	if (restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext))
		goto badframe;

	/* The ucontext contains a stack32_t, so we must convert!  */
	if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
		goto badframe;
	st.ss_sp = (void __user *)(long) sp;
	if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
		goto badframe;
	if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
		goto badframe;

	/* It is more difficult to avoid calling this function than to
	   call it and ignore errors.  */
	do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);

	/*
	 * Don't let your children do this ...
	 */
	__asm__ __volatile__(
		"move\t$29, %0\n\t"
		"j\tsyscall_exit"
		:/* no outputs */
		:"r" (&regs));
	/* Unreached */

badframe:
	force_sig(SIGSEGV, current);
}

int setup_rt_frame_n32(struct k_sigaction * ka,
	struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
{
	struct rt_sigframe_n32 __user *frame;
	int err = 0;
	s32 sp;

	frame = get_sigframe(ka, regs, sizeof(*frame));
	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
		goto give_sigsegv;

	install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);

	/* Create siginfo.  */
	err |= copy_siginfo_to_user(&frame->rs_info, info);

	/* Create the ucontext.  */
	err |= __put_user(0, &frame->rs_uc.uc_flags);
	err |= __put_user(0, &frame->rs_uc.uc_link);
	sp = (int) (long) current->sas_ss_sp;
	err |= __put_user(sp,
	                  &frame->rs_uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->regs[29]),
	                  &frame->rs_uc.uc_stack.ss_flags);
	err |= __put_user(current->sas_ss_size,
	                  &frame->rs_uc.uc_stack.ss_size);
	err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));

	if (err)
		goto give_sigsegv;

	/*
	 * Arguments to signal handler:
	 *
	 *   a0 = signal number
	 *   a1 = 0 (should be cause)
	 *   a2 = pointer to ucontext
	 *
	 * $25 and c0_epc point to the signal handler, $29 points to
	 * the struct rt_sigframe.
	 */
	regs->regs[ 4] = signr;
	regs->regs[ 5] = (unsigned long) &frame->rs_info;
	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
	regs->regs[29] = (unsigned long) frame;
	regs->regs[31] = (unsigned long) frame->rs_code;
	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;

	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
	       current->comm, current->pid,
	       frame, regs->cp0_epc, regs->regs[31]);

	return 0;

give_sigsegv:
	force_sigsegv(signr, current);
	return -EFAULT;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) 2003 Broadcom Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version 2
	7	* of the License, or (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17	*/
02416dcf RB	18	#include <linux/cache.h>
02416dcf RB	19	#include <linux/sched.h>
1da177e4 LT	20	#include <linux/mm.h>
	21	#include <linux/smp.h>
	22	#include <linux/smp_lock.h>
	23	#include <linux/kernel.h>
	24	#include <linux/signal.h>
	25	#include <linux/errno.h>
	26	#include <linux/wait.h>
	27	#include <linux/ptrace.h>
	28	#include <linux/unistd.h>
	29	#include <linux/compat.h>
	30	#include <linux/bitops.h>
	31
	32	#include <asm/asm.h>
	33	#include <asm/cacheflush.h>
	34	#include <asm/sim.h>
	35	#include <asm/uaccess.h>
	36	#include <asm/ucontext.h>
	37	#include <asm/system.h>
	38	#include <asm/fpu.h>
	39	#include <asm/cpu-features.h>
02416dcf	40	#include <asm/war.h>
1da177e4 LT	41
	42	#include "signal-common.h"
	43
	44	/*
	45	* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
	46	*/
	47	#define __NR_N32_rt_sigreturn 6211
	48	#define __NR_N32_restart_syscall 6214
	49
205d84aa RB	50	extern int setup_sigcontext(struct pt_regs , struct sigcontext __user );
	51	extern int restore_sigcontext(struct pt_regs , struct sigcontext __user );
	52
	53
1da177e4 LT	54	/* IRIX compatible stack_t */
	55	typedef struct sigaltstack32 {
	56	s32 ss_sp;
	57	compat_size_t ss_size;
	58	int ss_flags;
	59	} stack32_t;
	60
	61	struct ucontextn32 {
	62	u32 uc_flags;
	63	s32 uc_link;
	64	stack32_t uc_stack;
	65	struct sigcontext uc_mcontext;
	66	sigset_t uc_sigmask; /* mask last for extensibility */
	67	};
	68
c0b9bae9 FBH	69	#if ICACHE_REFILLS_WORKAROUND_WAR == 0
c0b9bae9 FBH	70
1da177e4 LT	71	struct rt_sigframe_n32 {
1da177e4 LT	72	u32 rs_ass[4]; /* argument save space for o32 */
02416dcf	73	u32 rs_code[2]; /* signal trampoline */
02416dcf	74	struct siginfo rs_info;
1da177e4	75	struct ucontextn32 rs_uc;
c0b9bae9 FBH	76	};
	77
	78	#else /* ICACHE_REFILLS_WORKAROUND_WAR */
	79
	80	struct rt_sigframe_n32 {
	81	u32 rs_ass[4]; /* argument save space for o32 */
	82	u32 rs_pad[2];
	83	struct siginfo rs_info;
	84	struct ucontextn32 rs_uc;
02416dcf	85	u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
1da177e4 LT	86	};
1da177e4 LT	87
c0b9bae9 FBH	88	#endif /* !ICACHE_REFILLS_WORKAROUND_WAR */
c0b9bae9 FBH	89
3f2e05e9 DH	90	extern void sigset_from_compat (sigset_t set, compat_sigset_t compat);
3f2e05e9 DH	91
f90080a0	92	asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
82ad93f4	93	{
b1bcb362 AN	94	compat_sigset_t __user *unewset;
b1bcb362 AN	95	compat_sigset_t uset;
82ad93f4 RB	96	size_t sigsetsize;
	97	sigset_t newset;
	98
	99	/* XXX Don't preclude handling different sized sigset_t's. */
	100	sigsetsize = regs.regs[5];
	101	if (sigsetsize != sizeof(sigset_t))
	102	return -EINVAL;
	103
	104	unewset = (compat_sigset_t __user *) regs.regs[4];
	105	if (copy_from_user(&uset, unewset, sizeof(uset)))
	106	return -EFAULT;
	107	sigset_from_compat (&newset, &uset);
	108	sigdelsetmask(&newset, ~_BLOCKABLE);
	109
	110	spin_lock_irq(&current->sighand->siglock);
	111	current->saved_sigmask = current->blocked;
	112	current->blocked = newset;
e0daad44	113	recalc_sigpending();
82ad93f4 RB	114	spin_unlock_irq(&current->sighand->siglock);
	115
	116	current->state = TASK_INTERRUPTIBLE;
	117	schedule();
	118	set_thread_flag(TIF_RESTORE_SIGMASK);
	119	return -ERESTARTNOHAND;
	120	}
	121
f90080a0	122	asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
1da177e4	123	{
9bbf28a3	124	struct rt_sigframe_n32 __user *frame;
1da177e4 LT	125	sigset_t set;
	126	stack_t st;
	127	s32 sp;
	128
9bbf28a3	129	frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
1da177e4 LT	130	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	131	goto badframe;
	132	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
	133	goto badframe;
	134
	135	sigdelsetmask(&set, ~_BLOCKABLE);
	136	spin_lock_irq(&current->sighand->siglock);
	137	current->blocked = set;
	138	recalc_sigpending();
	139	spin_unlock_irq(&current->sighand->siglock);
	140
	141	if (restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext))
	142	goto badframe;
	143
	144	/* The ucontext contains a stack32_t, so we must convert! */
	145	if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
	146	goto badframe;
9c6031cc	147	st.ss_sp = (void __user *)(long) sp;
1da177e4 LT	148	if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
	149	goto badframe;
	150	if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
	151	goto badframe;
	152
	153	/* It is more difficult to avoid calling this function than to
	154	call it and ignore errors. */
9bbf28a3	155	do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
1da177e4 LT	156
	157	/*
	158	* Don't let your children do this ...
	159	*/
	160	__asm__ __volatile__(
	161	"move\t$29, %0\n\t"
	162	"j\tsyscall_exit"
	163	:/* no outputs */
	164	:"r" (&regs));
	165	/* Unreached */
	166
	167	badframe:
	168	force_sig(SIGSEGV, current);
	169	}
	170
129bc8f7	171	int setup_rt_frame_n32(struct k_sigaction * ka,
1da177e4 LT	172	struct pt_regs regs, int signr, sigset_t set, siginfo_t *info)
1da177e4 LT	173	{
9bbf28a3	174	struct rt_sigframe_n32 __user *frame;
1da177e4 LT	175	int err = 0;
	176	s32 sp;
	177
	178	frame = get_sigframe(ka, regs, sizeof(*frame));
	179	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
	180	goto give_sigsegv;
	181
02416dcf	182	install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
1da177e4 LT	183
	184	/* Create siginfo. */
	185	err \|= copy_siginfo_to_user(&frame->rs_info, info);
	186
	187	/* Create the ucontext. */
	188	err \|= __put_user(0, &frame->rs_uc.uc_flags);
	189	err \|= __put_user(0, &frame->rs_uc.uc_link);
e0daad44	190	sp = (int) (long) current->sas_ss_sp;
1da177e4 LT	191	err \|= __put_user(sp,
	192	&frame->rs_uc.uc_stack.ss_sp);
	193	err \|= __put_user(sas_ss_flags(regs->regs[29]),
	194	&frame->rs_uc.uc_stack.ss_flags);
	195	err \|= __put_user(current->sas_ss_size,
	196	&frame->rs_uc.uc_stack.ss_size);
	197	err \|= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	198	err \|= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
	199
	200	if (err)
	201	goto give_sigsegv;
	202
	203	/*
	204	* Arguments to signal handler:
	205	*
	206	* a0 = signal number
	207	* a1 = 0 (should be cause)
	208	* a2 = pointer to ucontext
	209	*
	210	* $25 and c0_epc point to the signal handler, $29 points to
	211	* the struct rt_sigframe.
	212	*/
	213	regs->regs[ 4] = signr;
	214	regs->regs[ 5] = (unsigned long) &frame->rs_info;
	215	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
	216	regs->regs[29] = (unsigned long) frame;
	217	regs->regs[31] = (unsigned long) frame->rs_code;
	218	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
	219
722bb63d	220	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
1da177e4 LT	221	current->comm, current->pid,
1da177e4 LT	222	frame, regs->cp0_epc, regs->regs[31]);
722bb63d	223
7b3e2fc8	224	return 0;
1da177e4 LT	225
	226	give_sigsegv:
	227	force_sigsegv(signr, current);
7b3e2fc8	228	return -EFAULT;
1da177e4	229	}