1 files changed, 485 insertions, 0 deletions

diff --git a/arch/sparc/kernel/sys_sparc.c b/arch/sparc/kernel/sys_sparc.c
new file mode 100644
index 000000000000..0cdfc9d294b4
--- /dev/null
+++ b/arch/sparc/kernel/sys_sparc.c
@@ -0,0 +1,485 @@
+/* $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(&current->mm->mmap_sem);
+        retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+        up_write(&current->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(&current->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(&current->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;
+        int err = -EFAULT;
+        
+        down_read(&uts_sem);
+        
+        nlen = strlen(system_utsname.domainname) + 1;
+
+        if (nlen < len)
+                len = nlen;
+        if (len > __NEW_UTS_LEN)
+                goto done;
+        if (copy_to_user(name, system_utsname.domainname, len))
+                goto done;
+        err = 0;
+done:
+        up_read(&uts_sem);
+        return err;
+}