[net-next-2.6.git] / arch / sparc / kernel / sys_sparc_32.c

/* linux/arch/sparc/kernel/sys_sparc.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/sparc
 * platform.
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/utsname.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/ipc.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>

/* #define DEBUG_UNIMP_SYSCALL */

/* XXX Make this per-binary type, this way we can detect the type of
 * XXX a binary.  Every Sparc executable calls this very early on.
 */
asmlinkage unsigned long sys_getpagesize(void)
{
	return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
}

#define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
	struct vm_area_struct * vmm;

	if (flags & MAP_FIXED) {
		/* We do not accept a shared mapping if it would violate
		 * cache aliasing constraints.
		 */
		if ((flags & MAP_SHARED) &&
		    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
			return -EINVAL;
		return addr;
	}

	/* See asm-sparc/uaccess.h */
	if (len > TASK_SIZE - PAGE_SIZE)
		return -ENOMEM;
	if (ARCH_SUN4C && len > 0x20000000)
		return -ENOMEM;
	if (!addr)
		addr = TASK_UNMAPPED_BASE;

	if (flags & MAP_SHARED)
		addr = COLOUR_ALIGN(addr);
	else
		addr = PAGE_ALIGN(addr);

	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
		/* At this point:  (!vmm || addr < vmm->vm_end). */
		if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
			addr = PAGE_OFFSET;
			vmm = find_vma(current->mm, PAGE_OFFSET);
		}
		if (TASK_SIZE - PAGE_SIZE - len < addr)
			return -ENOMEM;
		if (!vmm || addr + len <= vmm->vm_start)
			return addr;
		addr = vmm->vm_end;
		if (flags & MAP_SHARED)
			addr = COLOUR_ALIGN(addr);
	}
}

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way unix traditionally does this, though.
 */
asmlinkage int sparc_pipe(struct pt_regs *regs)
{
	int fd[2];
	int error;

	error = do_pipe_flags(fd, 0);
	if (error)
		goto out;
	regs->u_regs[UREG_I1] = fd[1];
	error = fd[0];
out:
	return error;
}

int sparc_mmap_check(unsigned long addr, unsigned long len)
{
	if (ARCH_SUN4C &&
	    (len > 0x20000000 ||
	     (addr < 0xe0000000 && addr + len > 0x20000000)))
		return -EINVAL;

	/* See asm-sparc/uaccess.h */
	if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
		return -EINVAL;

	return 0;
}

/* Linux version of mmap */

asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags, unsigned long fd,
	unsigned long pgoff)
{
	/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
	   we have. */
	return sys_mmap_pgoff(addr, len, prot, flags, fd,
			      pgoff >> (PAGE_SHIFT - 12));
}

asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags, unsigned long fd,
	unsigned long off)
{
	/* no alignment check? */
	return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
}

long sparc_remap_file_pages(unsigned long start, unsigned long size,
			   unsigned long prot, unsigned long pgoff,
			   unsigned long flags)
{
	/* This works on an existing mmap so we don't need to validate
	 * the range as that was done at the original mmap call.
	 */
	return sys_remap_file_pages(start, size, prot,
				    (pgoff >> (PAGE_SHIFT - 12)), flags);
}

/* we come to here via sys_nis_syscall so it can setup the regs argument */
asmlinkage unsigned long
c_sys_nis_syscall (struct pt_regs *regs)
{
	static int count = 0;

	if (count++ > 5)
		return -ENOSYS;
	printk ("%s[%d]: Unimplemented SPARC system call %d\n",
		current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
#ifdef DEBUG_UNIMP_SYSCALL	
	show_regs (regs);
#endif
	return -ENOSYS;
}

/* #define DEBUG_SPARC_BREAKPOINT */

asmlinkage void
sparc_breakpoint (struct pt_regs *regs)
{
	siginfo_t info;

#ifdef DEBUG_SPARC_BREAKPOINT
        printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
#endif
	info.si_signo = SIGTRAP;
	info.si_errno = 0;
	info.si_code = TRAP_BRKPT;
	info.si_addr = (void __user *)regs->pc;
	info.si_trapno = 0;
	force_sig_info(SIGTRAP, &info, current);

#ifdef DEBUG_SPARC_BREAKPOINT
	printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
#endif
}

asmlinkage int
sparc_sigaction (int sig, const struct old_sigaction __user *act,
		 struct old_sigaction __user *oact)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

	WARN_ON_ONCE(sig >= 0);
	sig = -sig;

	if (act) {
		unsigned long 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);
		new_ka.ka_restorer = NULL;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		/* In the clone() case we could copy half consistent
		 * state to the user, however this could sleep and
		 * deadlock us if we held the signal lock on SMP.  So for
		 * now I take the easy way out and do no locking.
		 */
		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
			return -EFAULT;
		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	}

	return ret;
}

asmlinkage long
sys_rt_sigaction(int sig,
		 const struct sigaction __user *act,
		 struct sigaction __user *oact,
		 void __user *restorer,
		 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(sigset_t))
		return -EINVAL;

	if (act) {
		new_ka.ka_restorer = restorer;
		if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
			return -EFAULT;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
			return -EFAULT;
	}

	return ret;
}

asmlinkage int sys_getdomainname(char __user *name, int len)
{
 	int nlen, err;
 	
	if (len < 0)
		return -EINVAL;

 	down_read(&uts_sem);
 	
	nlen = strlen(utsname()->domainname) + 1;
	err = -EINVAL;
	if (nlen > len)
		goto out;

	err = -EFAULT;
	if (!copy_to_user(name, utsname()->domainname, nlen))
		err = 0;

out:
	up_read(&uts_sem);
	return err;
}

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
	long __res;
	register long __g1 __asm__ ("g1") = __NR_execve;
	register long __o0 __asm__ ("o0") = (long)(filename);
	register long __o1 __asm__ ("o1") = (long)(argv);
	register long __o2 __asm__ ("o2") = (long)(envp);
	asm volatile ("t 0x10\n\t"
		      "bcc 1f\n\t"
		      "mov %%o0, %0\n\t"
		      "sub %%g0, %%o0, %0\n\t"
		      "1:\n\t"
		      : "=r" (__res), "=&r" (__o0)
		      : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
		      : "cc");
	return __res;
}
Commit	Line	Data
5526b7e4	1	/* linux/arch/sparc/kernel/sys_sparc.c
1da177e4 LT	2	*
	3	* This file contains various random system calls that
	4	* have a non-standard calling sequence on the Linux/sparc
	5	* platform.
	6	*/
	7
	8	#include <linux/errno.h>
	9	#include <linux/types.h>
	10	#include <linux/sched.h>
	11	#include <linux/mm.h>
	12	#include <linux/fs.h>
	13	#include <linux/file.h>
	14	#include <linux/sem.h>
	15	#include <linux/msg.h>
	16	#include <linux/shm.h>
	17	#include <linux/stat.h>
	18	#include <linux/syscalls.h>
	19	#include <linux/mman.h>
	20	#include <linux/utsname.h>
	21	#include <linux/smp.h>
	22	#include <linux/smp_lock.h>
cba4fbbf	23	#include <linux/ipc.h>
1da177e4 LT	24
1da177e4 LT	25	#include <asm/uaccess.h>
fe74290d	26	#include <asm/unistd.h>
1da177e4 LT	27
	28	/* #define DEBUG_UNIMP_SYSCALL */
	29
	30	/* XXX Make this per-binary type, this way we can detect the type of
	31	* XXX a binary. Every Sparc executable calls this very early on.
	32	*/
	33	asmlinkage unsigned long sys_getpagesize(void)
	34	{
	35	return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
	36	}
	37
	38	#define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
	39
	40	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
	41	{
	42	struct vm_area_struct * vmm;
	43
	44	if (flags & MAP_FIXED) {
	45	/* We do not accept a shared mapping if it would violate
	46	* cache aliasing constraints.
	47	*/
e77414e0 AV	48	if ((flags & MAP_SHARED) &&
e77414e0 AV	49	((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
1da177e4 LT	50	return -EINVAL;
	51	return addr;
	52	}
	53
	54	/* See asm-sparc/uaccess.h */
	55	if (len > TASK_SIZE - PAGE_SIZE)
	56	return -ENOMEM;
5110bd21	57	if (ARCH_SUN4C && len > 0x20000000)
1da177e4 LT	58	return -ENOMEM;
	59	if (!addr)
	60	addr = TASK_UNMAPPED_BASE;
	61
	62	if (flags & MAP_SHARED)
	63	addr = COLOUR_ALIGN(addr);
	64	else
	65	addr = PAGE_ALIGN(addr);
	66
	67	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
	68	/* At this point: (!vmm \|\| addr < vmm->vm_end). */
5110bd21	69	if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
1da177e4 LT	70	addr = PAGE_OFFSET;
	71	vmm = find_vma(current->mm, PAGE_OFFSET);
	72	}
	73	if (TASK_SIZE - PAGE_SIZE - len < addr)
	74	return -ENOMEM;
	75	if (!vmm \|\| addr + len <= vmm->vm_start)
	76	return addr;
	77	addr = vmm->vm_end;
	78	if (flags & MAP_SHARED)
	79	addr = COLOUR_ALIGN(addr);
	80	}
	81	}
	82
1da177e4 LT	83	/*
	84	* sys_pipe() is the normal C calling standard for creating
	85	* a pipe. It's not the way unix traditionally does this, though.
	86	*/
	87	asmlinkage int sparc_pipe(struct pt_regs *regs)
	88	{
	89	int fd[2];
	90	int error;
	91
ed8cae8b	92	error = do_pipe_flags(fd, 0);
1da177e4 LT	93	if (error)
	94	goto out;
	95	regs->u_regs[UREG_I1] = fd[1];
	96	error = fd[0];
	97	out:
	98	return error;
	99	}
	100
94d149c3	101	int sparc_mmap_check(unsigned long addr, unsigned long len)
3a459756	102	{
5110bd21	103	if (ARCH_SUN4C &&
3a459756	104	(len > 0x20000000 \|\|
58163393	105	(addr < 0xe0000000 && addr + len > 0x20000000)))
3a459756 KK	106	return -EINVAL;
	107
	108	/* See asm-sparc/uaccess.h */
	109	if (len > TASK_SIZE - PAGE_SIZE \|\| addr + len > TASK_SIZE - PAGE_SIZE)
	110	return -EINVAL;
	111
	112	return 0;
	113	}
	114
1da177e4	115	/* Linux version of mmap */
1da177e4 LT	116
	117	asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
	118	unsigned long prot, unsigned long flags, unsigned long fd,
	119	unsigned long pgoff)
	120	{
	121	/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
	122	we have. */
f8b72560 AV	123	return sys_mmap_pgoff(addr, len, prot, flags, fd,
f8b72560 AV	124	pgoff >> (PAGE_SHIFT - 12));
1da177e4 LT	125	}
	126
	127	asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
	128	unsigned long prot, unsigned long flags, unsigned long fd,
	129	unsigned long off)
	130	{
f8b72560 AV	131	/* no alignment check? */
f8b72560 AV	132	return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
1da177e4 LT	133	}
	134
	135	long sparc_remap_file_pages(unsigned long start, unsigned long size,
	136	unsigned long prot, unsigned long pgoff,
	137	unsigned long flags)
	138	{
	139	/* This works on an existing mmap so we don't need to validate
	140	* the range as that was done at the original mmap call.
	141	*/
	142	return sys_remap_file_pages(start, size, prot,
	143	(pgoff >> (PAGE_SHIFT - 12)), flags);
	144	}
	145
1da177e4 LT	146	/* we come to here via sys_nis_syscall so it can setup the regs argument */
	147	asmlinkage unsigned long
	148	c_sys_nis_syscall (struct pt_regs *regs)
	149	{
	150	static int count = 0;
	151
	152	if (count++ > 5)
	153	return -ENOSYS;
	154	printk ("%s[%d]: Unimplemented SPARC system call %d\n",
19c5870c	155	current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
1da177e4 LT	156	#ifdef DEBUG_UNIMP_SYSCALL
	157	show_regs (regs);
	158	#endif
	159	return -ENOSYS;
	160	}
	161
	162	/* #define DEBUG_SPARC_BREAKPOINT */
	163
	164	asmlinkage void
	165	sparc_breakpoint (struct pt_regs *regs)
	166	{
	167	siginfo_t info;
	168
1da177e4 LT	169	#ifdef DEBUG_SPARC_BREAKPOINT
	170	printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
	171	#endif
	172	info.si_signo = SIGTRAP;
	173	info.si_errno = 0;
	174	info.si_code = TRAP_BRKPT;
	175	info.si_addr = (void __user *)regs->pc;
	176	info.si_trapno = 0;
	177	force_sig_info(SIGTRAP, &info, current);
	178
	179	#ifdef DEBUG_SPARC_BREAKPOINT
	180	printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
	181	#endif
1da177e4 LT	182	}
	183
	184	asmlinkage int
	185	sparc_sigaction (int sig, const struct old_sigaction __user *act,
	186	struct old_sigaction __user *oact)
	187	{
	188	struct k_sigaction new_ka, old_ka;
	189	int ret;
	190
5526b7e4 DM	191	WARN_ON_ONCE(sig >= 0);
5526b7e4 DM	192	sig = -sig;
1da177e4 LT	193
	194	if (act) {
	195	unsigned long mask;
	196
	197	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	198	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
	199	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
	200	return -EFAULT;
	201	__get_user(new_ka.sa.sa_flags, &act->sa_flags);
	202	__get_user(mask, &act->sa_mask);
	203	siginitset(&new_ka.sa.sa_mask, mask);
	204	new_ka.ka_restorer = NULL;
	205	}
	206
	207	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	208
	209	if (!ret && oact) {
	210	/* In the clone() case we could copy half consistent
	211	* state to the user, however this could sleep and
	212	* deadlock us if we held the signal lock on SMP. So for
	213	* now I take the easy way out and do no locking.
	214	*/
	215	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	216	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
	217	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
	218	return -EFAULT;
	219	__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	220	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	221	}
	222
	223	return ret;
	224	}
	225
	226	asmlinkage long
	227	sys_rt_sigaction(int sig,
	228	const struct sigaction __user *act,
	229	struct sigaction __user *oact,
	230	void __user *restorer,
	231	size_t sigsetsize)
	232	{
	233	struct k_sigaction new_ka, old_ka;
	234	int ret;
	235
	236	/* XXX: Don't preclude handling different sized sigset_t's. */
	237	if (sigsetsize != sizeof(sigset_t))
	238	return -EINVAL;
	239
1da177e4 LT	240	if (act) {
	241	new_ka.ka_restorer = restorer;
	242	if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
	243	return -EFAULT;
	244	}
	245
	246	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	247
	248	if (!ret && oact) {
	249	if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
	250	return -EFAULT;
	251	}
	252
	253	return ret;
	254	}
	255
	256	asmlinkage int sys_getdomainname(char __user *name, int len)
	257	{
8310a32c	258	int nlen, err;
1da177e4	259
b9c54f91	260	if (len < 0)
8310a32c DM	261	return -EINVAL;
8310a32c DM	262
1da177e4 LT	263	down_read(&uts_sem);
1da177e4 LT	264
e9ff3990	265	nlen = strlen(utsname()->domainname) + 1;
b9c54f91 AW	266	err = -EINVAL;
	267	if (nlen > len)
	268	goto out;
8310a32c DM	269
8310a32c DM	270	err = -EFAULT;
e9ff3990	271	if (!copy_to_user(name, utsname()->domainname, nlen))
8310a32c DM	272	err = 0;
8310a32c DM	273
b9c54f91	274	out:
1da177e4 LT	275	up_read(&uts_sem);
	276	return err;
	277	}
fe74290d AB	278
	279	/*
	280	* Do a system call from kernel instead of calling sys_execve so we
	281	* end up with proper pt_regs.
	282	*/
	283	int kernel_execve(const char filename, char const argv[], char *const envp[])
	284	{
	285	long __res;
	286	register long __g1 __asm__ ("g1") = __NR_execve;
	287	register long __o0 __asm__ ("o0") = (long)(filename);
	288	register long __o1 __asm__ ("o1") = (long)(argv);
	289	register long __o2 __asm__ ("o2") = (long)(envp);
	290	asm volatile ("t 0x10\n\t"
	291	"bcc 1f\n\t"
	292	"mov %%o0, %0\n\t"
	293	"sub %%g0, %%o0, %0\n\t"
	294	"1:\n\t"
	295	: "=r" (__res), "=&r" (__o0)
	296	: "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
	297	: "cc");
	298	return __res;
	299	}