486 lines
12 KiB
C
486 lines
12 KiB
C
/* $Id: sys_sparc.c,v 1.70 2001/04/14 01:12:02 davem Exp $
|
|
* 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 <asm/uaccess.h>
|
|
#include <asm/ipc.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 & (SHMLBA - 1)))
|
|
return -EINVAL;
|
|
return addr;
|
|
}
|
|
|
|
/* See asm-sparc/uaccess.h */
|
|
if (len > TASK_SIZE - PAGE_SIZE)
|
|
return -ENOMEM;
|
|
if (ARCH_SUN4C_SUN4 && 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_SUN4 && 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);
|
|
}
|
|
}
|
|
|
|
asmlinkage unsigned long sparc_brk(unsigned long brk)
|
|
{
|
|
if(ARCH_SUN4C_SUN4) {
|
|
if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
|
|
return current->mm->brk;
|
|
}
|
|
return sys_brk(brk);
|
|
}
|
|
|
|
/*
|
|
* 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(fd);
|
|
if (error)
|
|
goto out;
|
|
regs->u_regs[UREG_I1] = fd[1];
|
|
error = fd[0];
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
|
|
*
|
|
* This is really horribly ugly.
|
|
*/
|
|
|
|
asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
|
|
{
|
|
int version, err;
|
|
|
|
version = call >> 16; /* hack for backward compatibility */
|
|
call &= 0xffff;
|
|
|
|
if (call <= SEMCTL)
|
|
switch (call) {
|
|
case SEMOP:
|
|
err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
|
|
goto out;
|
|
case SEMTIMEDOP:
|
|
err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
|
|
goto out;
|
|
case SEMGET:
|
|
err = sys_semget (first, second, third);
|
|
goto out;
|
|
case SEMCTL: {
|
|
union semun fourth;
|
|
err = -EINVAL;
|
|
if (!ptr)
|
|
goto out;
|
|
err = -EFAULT;
|
|
if (get_user(fourth.__pad,
|
|
(void __user * __user *)ptr))
|
|
goto out;
|
|
err = sys_semctl (first, second, third, fourth);
|
|
goto out;
|
|
}
|
|
default:
|
|
err = -ENOSYS;
|
|
goto out;
|
|
}
|
|
if (call <= MSGCTL)
|
|
switch (call) {
|
|
case MSGSND:
|
|
err = sys_msgsnd (first, (struct msgbuf __user *) ptr,
|
|
second, third);
|
|
goto out;
|
|
case MSGRCV:
|
|
switch (version) {
|
|
case 0: {
|
|
struct ipc_kludge tmp;
|
|
err = -EINVAL;
|
|
if (!ptr)
|
|
goto out;
|
|
err = -EFAULT;
|
|
if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
|
|
goto out;
|
|
err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
|
|
goto out;
|
|
}
|
|
case 1: default:
|
|
err = sys_msgrcv (first,
|
|
(struct msgbuf __user *) ptr,
|
|
second, fifth, third);
|
|
goto out;
|
|
}
|
|
case MSGGET:
|
|
err = sys_msgget ((key_t) first, second);
|
|
goto out;
|
|
case MSGCTL:
|
|
err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
|
|
goto out;
|
|
default:
|
|
err = -ENOSYS;
|
|
goto out;
|
|
}
|
|
if (call <= SHMCTL)
|
|
switch (call) {
|
|
case SHMAT:
|
|
switch (version) {
|
|
case 0: default: {
|
|
ulong raddr;
|
|
err = do_shmat (first, (char __user *) ptr, second, &raddr);
|
|
if (err)
|
|
goto out;
|
|
err = -EFAULT;
|
|
if (put_user (raddr, (ulong __user *) third))
|
|
goto out;
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
case 1: /* iBCS2 emulator entry point */
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
case SHMDT:
|
|
err = sys_shmdt ((char __user *)ptr);
|
|
goto out;
|
|
case SHMGET:
|
|
err = sys_shmget (first, second, third);
|
|
goto out;
|
|
case SHMCTL:
|
|
err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
|
|
goto out;
|
|
default:
|
|
err = -ENOSYS;
|
|
goto out;
|
|
}
|
|
else
|
|
err = -ENOSYS;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/* Linux version of mmap */
|
|
static unsigned long do_mmap2(unsigned long addr, unsigned long len,
|
|
unsigned long prot, unsigned long flags, unsigned long fd,
|
|
unsigned long pgoff)
|
|
{
|
|
struct file * file = NULL;
|
|
unsigned long retval = -EBADF;
|
|
|
|
if (!(flags & MAP_ANONYMOUS)) {
|
|
file = fget(fd);
|
|
if (!file)
|
|
goto out;
|
|
}
|
|
|
|
retval = -EINVAL;
|
|
len = PAGE_ALIGN(len);
|
|
if (ARCH_SUN4C_SUN4 &&
|
|
(len > 0x20000000 ||
|
|
((flags & MAP_FIXED) &&
|
|
addr < 0xe0000000 && addr + len > 0x20000000)))
|
|
goto out_putf;
|
|
|
|
/* See asm-sparc/uaccess.h */
|
|
if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
|
|
goto out_putf;
|
|
|
|
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
|
|
|
|
down_write(¤t->mm->mmap_sem);
|
|
retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
|
|
up_write(¤t->mm->mmap_sem);
|
|
|
|
out_putf:
|
|
if (file)
|
|
fput(file);
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
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 do_mmap2(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)
|
|
{
|
|
return do_mmap2(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);
|
|
}
|
|
|
|
extern unsigned long do_mremap(unsigned long addr,
|
|
unsigned long old_len, unsigned long new_len,
|
|
unsigned long flags, unsigned long new_addr);
|
|
|
|
asmlinkage unsigned long sparc_mremap(unsigned long addr,
|
|
unsigned long old_len, unsigned long new_len,
|
|
unsigned long flags, unsigned long new_addr)
|
|
{
|
|
struct vm_area_struct *vma;
|
|
unsigned long ret = -EINVAL;
|
|
if (ARCH_SUN4C_SUN4) {
|
|
if (old_len > 0x20000000 || new_len > 0x20000000)
|
|
goto out;
|
|
if (addr < 0xe0000000 && addr + old_len > 0x20000000)
|
|
goto out;
|
|
}
|
|
if (old_len > TASK_SIZE - PAGE_SIZE ||
|
|
new_len > TASK_SIZE - PAGE_SIZE)
|
|
goto out;
|
|
down_write(¤t->mm->mmap_sem);
|
|
if (flags & MREMAP_FIXED) {
|
|
if (ARCH_SUN4C_SUN4 &&
|
|
new_addr < 0xe0000000 &&
|
|
new_addr + new_len > 0x20000000)
|
|
goto out_sem;
|
|
if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
|
|
goto out_sem;
|
|
} else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
|
|
addr + new_len > 0x20000000) ||
|
|
addr + new_len > TASK_SIZE - PAGE_SIZE) {
|
|
unsigned long map_flags = 0;
|
|
struct file *file = NULL;
|
|
|
|
ret = -ENOMEM;
|
|
if (!(flags & MREMAP_MAYMOVE))
|
|
goto out_sem;
|
|
|
|
vma = find_vma(current->mm, addr);
|
|
if (vma) {
|
|
if (vma->vm_flags & VM_SHARED)
|
|
map_flags |= MAP_SHARED;
|
|
file = vma->vm_file;
|
|
}
|
|
|
|
new_addr = get_unmapped_area(file, addr, new_len,
|
|
vma ? vma->vm_pgoff : 0,
|
|
map_flags);
|
|
ret = new_addr;
|
|
if (new_addr & ~PAGE_MASK)
|
|
goto out_sem;
|
|
flags |= MREMAP_FIXED;
|
|
}
|
|
ret = do_mremap(addr, old_len, new_len, flags, new_addr);
|
|
out_sem:
|
|
up_write(¤t->mm->mmap_sem);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/* 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, current->pid, (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;
|
|
|
|
lock_kernel();
|
|
#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
|
|
unlock_kernel();
|
|
}
|
|
|
|
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;
|
|
|
|
if (sig < 0) {
|
|
current->thread.new_signal = 1;
|
|
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;
|
|
|
|
/* All tasks which use RT signals (effectively) use
|
|
* new style signals.
|
|
*/
|
|
current->thread.new_signal = 1;
|
|
|
|
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 || len > __NEW_UTS_LEN)
|
|
return -EINVAL;
|
|
|
|
down_read(&uts_sem);
|
|
|
|
nlen = strlen(system_utsname.domainname) + 1;
|
|
if (nlen < len)
|
|
len = nlen;
|
|
|
|
err = -EFAULT;
|
|
if (!copy_to_user(name, system_utsname.domainname, len))
|
|
err = 0;
|
|
|
|
up_read(&uts_sem);
|
|
return err;
|
|
}
|