[net-next-2.6.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/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/abi.h>
#include <asm/asm.h>
#include <asm/cacheflush.h>
#include <asm/compat-signal.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 <asm/vdso.h>

#include "signal-common.h"

/*
 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
 */
#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;
	compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
};

struct rt_sigframe_n32 {
	u32 rs_ass[4];			/* argument save space for o32 */
	u32 rs_pad[2];			/* Was: signal trampoline */
	struct compat_siginfo rs_info;
	struct ucontextn32 rs_uc;
};

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;
	mm_segment_t old_fs;
	sigset_t set;
	stack_t st;
	s32 sp;
	int sig;

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

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

	sig = restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext);
	if (sig < 0)
		goto badframe;
	else if (sig)
		force_sig(sig, current);

	/* 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.  */
	old_fs = get_fs();
	set_fs(KERNEL_DS);
	do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
	set_fs(old_fs);


	/*
	 * 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);
}

static int setup_rt_frame_n32(void *sig_return, 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;

	/* Create siginfo.  */
	err |= copy_siginfo_to_user32(&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_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, 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) sig_return;
	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;
}

struct mips_abi mips_abi_n32 = {
	.setup_rt_frame	= setup_rt_frame_n32,
	.rt_signal_return_offset =
		offsetof(struct mips_vdso, n32_rt_signal_trampoline),
	.restart	= __NR_N32_restart_syscall
};
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>
1da177e4 LT	21	#include <linux/smp.h>
1da177e4 LT	22	#include <linux/kernel.h>
	23	#include <linux/signal.h>
	24	#include <linux/errno.h>
	25	#include <linux/wait.h>
	26	#include <linux/ptrace.h>
	27	#include <linux/unistd.h>
	28	#include <linux/compat.h>
	29	#include <linux/bitops.h>
	30
151fd6ac	31	#include <asm/abi.h>
1da177e4 LT	32	#include <asm/asm.h>
1da177e4 LT	33	#include <asm/cacheflush.h>
431dc804	34	#include <asm/compat-signal.h>
1da177e4 LT	35	#include <asm/sim.h>
	36	#include <asm/uaccess.h>
	37	#include <asm/ucontext.h>
	38	#include <asm/system.h>
	39	#include <asm/fpu.h>
	40	#include <asm/cpu-features.h>
02416dcf	41	#include <asm/war.h>
d814c28c	42	#include <asm/vdso.h>
1da177e4 LT	43
	44	#include "signal-common.h"
	45
	46	/*
	47	* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
	48	*/
1da177e4 LT	49	#define __NR_N32_restart_syscall 6214
1da177e4 LT	50
205d84aa RB	51	extern int setup_sigcontext(struct pt_regs , struct sigcontext __user );
	52	extern int restore_sigcontext(struct pt_regs , struct sigcontext __user );
	53
	54
1da177e4 LT	55	/* IRIX compatible stack_t */
	56	typedef struct sigaltstack32 {
	57	s32 ss_sp;
	58	compat_size_t ss_size;
	59	int ss_flags;
	60	} stack32_t;
	61
	62	struct ucontextn32 {
	63	u32 uc_flags;
	64	s32 uc_link;
	65	stack32_t uc_stack;
	66	struct sigcontext uc_mcontext;
431dc804	67	compat_sigset_t uc_sigmask; /* mask last for extensibility */
1da177e4 LT	68	};
1da177e4 LT	69
c0b9bae9 FBH	70	struct rt_sigframe_n32 {
c0b9bae9 FBH	71	u32 rs_ass[4]; /* argument save space for o32 */
d814c28c	72	u32 rs_pad[2]; /* Was: signal trampoline */
a76f3a41	73	struct compat_siginfo rs_info;
c0b9bae9	74	struct ucontextn32 rs_uc;
1da177e4 LT	75	};
1da177e4 LT	76
49a89efb	77	extern void sigset_from_compat(sigset_t set, compat_sigset_t compat);
3f2e05e9	78
f90080a0	79	asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
82ad93f4	80	{
b1bcb362 AN	81	compat_sigset_t __user *unewset;
b1bcb362 AN	82	compat_sigset_t uset;
82ad93f4 RB	83	size_t sigsetsize;
	84	sigset_t newset;
	85
	86	/* XXX Don't preclude handling different sized sigset_t's. */
	87	sigsetsize = regs.regs[5];
	88	if (sigsetsize != sizeof(sigset_t))
	89	return -EINVAL;
	90
	91	unewset = (compat_sigset_t __user *) regs.regs[4];
	92	if (copy_from_user(&uset, unewset, sizeof(uset)))
	93	return -EFAULT;
49a89efb	94	sigset_from_compat(&newset, &uset);
82ad93f4 RB	95	sigdelsetmask(&newset, ~_BLOCKABLE);
	96
	97	spin_lock_irq(&current->sighand->siglock);
	98	current->saved_sigmask = current->blocked;
	99	current->blocked = newset;
e0daad44	100	recalc_sigpending();
82ad93f4 RB	101	spin_unlock_irq(&current->sighand->siglock);
	102
	103	current->state = TASK_INTERRUPTIBLE;
	104	schedule();
	105	set_thread_flag(TIF_RESTORE_SIGMASK);
	106	return -ERESTARTNOHAND;
	107	}
	108
f90080a0	109	asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
1da177e4	110	{
9bbf28a3	111	struct rt_sigframe_n32 __user *frame;
4bfb8c5c	112	mm_segment_t old_fs;
1da177e4 LT	113	sigset_t set;
	114	stack_t st;
	115	s32 sp;
c6a2f467	116	int sig;
1da177e4	117
9bbf28a3	118	frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
1da177e4 LT	119	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
1da177e4 LT	120	goto badframe;
431dc804	121	if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
1da177e4 LT	122	goto badframe;
	123
	124	sigdelsetmask(&set, ~_BLOCKABLE);
	125	spin_lock_irq(&current->sighand->siglock);
	126	current->blocked = set;
	127	recalc_sigpending();
	128	spin_unlock_irq(&current->sighand->siglock);
	129
c6a2f467 AN	130	sig = restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext);
c6a2f467 AN	131	if (sig < 0)
1da177e4	132	goto badframe;
c6a2f467 AN	133	else if (sig)
c6a2f467 AN	134	force_sig(sig, current);
1da177e4 LT	135
	136	/* The ucontext contains a stack32_t, so we must convert! */
	137	if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
	138	goto badframe;
9c6031cc	139	st.ss_sp = (void __user *)(long) sp;
1da177e4 LT	140	if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
	141	goto badframe;
	142	if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
	143	goto badframe;
	144
	145	/* It is more difficult to avoid calling this function than to
	146	call it and ignore errors. */
4bfb8c5c AV	147	old_fs = get_fs();
4bfb8c5c AV	148	set_fs(KERNEL_DS);
9bbf28a3	149	do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
4bfb8c5c AV	150	set_fs(old_fs);
4bfb8c5c AV	151
1da177e4 LT	152
	153	/*
	154	* Don't let your children do this ...
	155	*/
	156	__asm__ __volatile__(
	157	"move\t$29, %0\n\t"
	158	"j\tsyscall_exit"
	159	:/* no outputs */
	160	:"r" (&regs));
	161	/* Unreached */
	162
	163	badframe:
	164	force_sig(SIGSEGV, current);
	165	}
	166
d814c28c	167	static int setup_rt_frame_n32(void sig_return, struct k_sigaction ka,
1da177e4 LT	168	struct pt_regs regs, int signr, sigset_t set, siginfo_t *info)
1da177e4 LT	169	{
9bbf28a3	170	struct rt_sigframe_n32 __user *frame;
1da177e4 LT	171	int err = 0;
	172	s32 sp;
	173
	174	frame = get_sigframe(ka, regs, sizeof(*frame));
	175	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
	176	goto give_sigsegv;
	177
1da177e4	178	/* Create siginfo. */
a76f3a41	179	err \|= copy_siginfo_to_user32(&frame->rs_info, info);
1da177e4 LT	180
	181	/* Create the ucontext. */
	182	err \|= __put_user(0, &frame->rs_uc.uc_flags);
	183	err \|= __put_user(0, &frame->rs_uc.uc_link);
e0daad44	184	sp = (int) (long) current->sas_ss_sp;
1da177e4 LT	185	err \|= __put_user(sp,
	186	&frame->rs_uc.uc_stack.ss_sp);
	187	err \|= __put_user(sas_ss_flags(regs->regs[29]),
	188	&frame->rs_uc.uc_stack.ss_flags);
	189	err \|= __put_user(current->sas_ss_size,
	190	&frame->rs_uc.uc_stack.ss_size);
	191	err \|= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
431dc804	192	err \|= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
1da177e4 LT	193
	194	if (err)
	195	goto give_sigsegv;
	196
	197	/*
	198	* Arguments to signal handler:
	199	*
	200	* a0 = signal number
	201	* a1 = 0 (should be cause)
	202	* a2 = pointer to ucontext
	203	*
	204	* $25 and c0_epc point to the signal handler, $29 points to
	205	* the struct rt_sigframe.
	206	*/
	207	regs->regs[ 4] = signr;
	208	regs->regs[ 5] = (unsigned long) &frame->rs_info;
	209	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
	210	regs->regs[29] = (unsigned long) frame;
d814c28c	211	regs->regs[31] = (unsigned long) sig_return;
1da177e4 LT	212	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
1da177e4 LT	213
722bb63d	214	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
1da177e4 LT	215	current->comm, current->pid,
1da177e4 LT	216	frame, regs->cp0_epc, regs->regs[31]);
722bb63d	217
7b3e2fc8	218	return 0;
1da177e4 LT	219
	220	give_sigsegv:
	221	force_sigsegv(signr, current);
7b3e2fc8	222	return -EFAULT;
1da177e4	223	}
151fd6ac RB	224
	225	struct mips_abi mips_abi_n32 = {
	226	.setup_rt_frame = setup_rt_frame_n32,
d814c28c DD	227	.rt_signal_return_offset =
d814c28c DD	228	offsetof(struct mips_vdso, n32_rt_signal_trampoline),
151fd6ac RB	229	.restart = __NR_N32_restart_syscall
151fd6ac RB	230	};