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-rw-r--r--arch/powerpc/kernel/syscalls.c351
1 files changed, 351 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
new file mode 100644
index 000000000000..3e3a4f67de96
--- /dev/null
+++ b/arch/powerpc/kernel/syscalls.c
@@ -0,0 +1,351 @@
+/*
+ * Implementation of various system calls for Linux/PowerPC
+ *
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Derived from "arch/i386/kernel/sys_i386.c"
+ * Adapted from the i386 version by Gary Thomas
+ * Modified by Cort Dougan (cort@cs.nmt.edu)
+ * and Paul Mackerras (paulus@cs.anu.edu.au).
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the Linux/PPC
+ * platform.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/stat.h>
+#include <linux/mman.h>
+#include <linux/sys.h>
+#include <linux/ipc.h>
+#include <linux/utsname.h>
+#include <linux/file.h>
+#include <linux/init.h>
+#include <linux/personality.h>
+
+#include <asm/uaccess.h>
+#include <asm/ipc.h>
+#include <asm/semaphore.h>
+#include <asm/time.h>
+#include <asm/unistd.h>
+
+extern unsigned long wall_jiffies;
+
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly.
+ */
+int sys_ipc(uint call, int first, unsigned long second, long third,
+ void __user *ptr, long fifth)
+{
+ int version, ret;
+
+ version = call >> 16; /* hack for backward compatibility */
+ call &= 0xffff;
+
+ ret = -ENOSYS;
+ switch (call) {
+ case SEMOP:
+ ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
+ (unsigned)second, NULL);
+ break;
+ case SEMTIMEDOP:
+ ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
+ (unsigned)second,
+ (const struct timespec __user *) fifth);
+ break;
+ case SEMGET:
+ ret = sys_semget (first, (int)second, third);
+ break;
+ case SEMCTL: {
+ union semun fourth;
+
+ ret = -EINVAL;
+ if (!ptr)
+ break;
+ if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
+ break;
+ ret = sys_semctl(first, (int)second, third, fourth);
+ break;
+ }
+ case MSGSND:
+ ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
+ (size_t)second, third);
+ break;
+ case MSGRCV:
+ switch (version) {
+ case 0: {
+ struct ipc_kludge tmp;
+
+ ret = -EINVAL;
+ if (!ptr)
+ break;
+ if ((ret = copy_from_user(&tmp,
+ (struct ipc_kludge __user *) ptr,
+ sizeof (tmp)) ? -EFAULT : 0))
+ break;
+ ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
+ tmp.msgtyp, third);
+ break;
+ }
+ default:
+ ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
+ (size_t)second, fifth, third);
+ break;
+ }
+ break;
+ case MSGGET:
+ ret = sys_msgget((key_t)first, (int)second);
+ break;
+ case MSGCTL:
+ ret = sys_msgctl(first, (int)second,
+ (struct msqid_ds __user *)ptr);
+ break;
+ case SHMAT: {
+ ulong raddr;
+ ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
+ if (ret)
+ break;
+ ret = put_user(raddr, (ulong __user *) third);
+ break;
+ }
+ case SHMDT:
+ ret = sys_shmdt((char __user *)ptr);
+ break;
+ case SHMGET:
+ ret = sys_shmget(first, (size_t)second, third);
+ break;
+ case SHMCTL:
+ ret = sys_shmctl(first, (int)second,
+ (struct shmid_ds __user *)ptr);
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * sys_pipe() is the normal C calling standard for creating
+ * a pipe. It's not the way unix traditionally does this, though.
+ */
+int sys_pipe(int __user *fildes)
+{
+ int fd[2];
+ int error;
+
+ error = do_pipe(fd);
+ if (!error) {
+ if (copy_to_user(fildes, fd, 2*sizeof(int)))
+ error = -EFAULT;
+ }
+ return error;
+}
+
+static inline unsigned long do_mmap2(unsigned long addr, size_t len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long off, int shift)
+{
+ struct file * file = NULL;
+ int ret = -EINVAL;
+
+ if (shift) {
+ if (off & ((1 << shift) - 1))
+ goto out;
+ off >>= shift;
+ }
+
+ ret = -EBADF;
+ if (!(flags & MAP_ANONYMOUS)) {
+ if (!(file = fget(fd)))
+ goto out;
+ }
+
+ flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+
+ down_write(&current->mm->mmap_sem);
+ ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
+ up_write(&current->mm->mmap_sem);
+ if (file)
+ fput(file);
+out:
+ return ret;
+}
+
+unsigned long sys_mmap2(unsigned long addr, size_t len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long pgoff)
+{
+ return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
+}
+
+unsigned long sys_mmap(unsigned long addr, size_t len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, off_t offset)
+{
+ return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
+}
+
+#ifdef CONFIG_PPC32
+/*
+ * Due to some executables calling the wrong select we sometimes
+ * get wrong args. This determines how the args are being passed
+ * (a single ptr to them all args passed) then calls
+ * sys_select() with the appropriate args. -- Cort
+ */
+int
+ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
+{
+ if ( (unsigned long)n >= 4096 )
+ {
+ unsigned long __user *buffer = (unsigned long __user *)n;
+ if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
+ || __get_user(n, buffer)
+ || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
+ || __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
+ || __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
+ || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
+ return -EFAULT;
+ }
+ return sys_select(n, inp, outp, exp, tvp);
+}
+#endif
+
+#ifdef CONFIG_PPC64
+long ppc64_personality(unsigned long personality)
+{
+ long ret;
+
+ if (personality(current->personality) == PER_LINUX32
+ && personality == PER_LINUX)
+ personality = PER_LINUX32;
+ ret = sys_personality(personality);
+ if (ret == PER_LINUX32)
+ ret = PER_LINUX;
+ return ret;
+}
+#endif
+
+#ifdef CONFIG_PPC64
+#define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32)
+#else
+#define OVERRIDE_MACHINE 0
+#endif
+
+static inline int override_machine(char *mach)
+{
+ if (OVERRIDE_MACHINE) {
+ /* change ppc64 to ppc */
+ if (__put_user(0, mach+3) || __put_user(0, mach+4))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+long ppc_newuname(struct new_utsname __user * name)
+{
+ int err = 0;
+
+ down_read(&uts_sem);
+ if (copy_to_user(name, &system_utsname, sizeof(*name)))
+ err = -EFAULT;
+ up_read(&uts_sem);
+ if (!err)
+ err = override_machine(name->machine);
+ return err;
+}
+
+int sys_uname(struct old_utsname __user *name)
+{
+ int err = 0;
+
+ down_read(&uts_sem);
+ if (copy_to_user(name, &system_utsname, sizeof(*name)))
+ err = -EFAULT;
+ up_read(&uts_sem);
+ if (!err)
+ err = override_machine(name->machine);
+ return err;
+}
+
+int sys_olduname(struct oldold_utsname __user *name)
+{
+ int error;
+
+ if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
+ return -EFAULT;
+
+ down_read(&uts_sem);
+ error = __copy_to_user(&name->sysname, &system_utsname.sysname,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->nodename, &system_utsname.nodename,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->release, &system_utsname.release,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->release + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->version, &system_utsname.version,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->version + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->machine, &system_utsname.machine,
+ __OLD_UTS_LEN);
+ error |= override_machine(name->machine);
+ up_read(&uts_sem);
+
+ return error? -EFAULT: 0;
+}
+
+#ifdef CONFIG_PPC64
+time_t sys64_time(time_t __user * tloc)
+{
+ time_t secs;
+ time_t usecs;
+
+ long tb_delta = tb_ticks_since(tb_last_stamp);
+ tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
+
+ secs = xtime.tv_sec;
+ usecs = (xtime.tv_nsec/1000) + tb_delta / tb_ticks_per_usec;
+ while (usecs >= USEC_PER_SEC) {
+ ++secs;
+ usecs -= USEC_PER_SEC;
+ }
+
+ if (tloc) {
+ if (put_user(secs,tloc))
+ secs = -EFAULT;
+ }
+
+ return secs;
+}
+#endif
+
+void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
+ unsigned long r6, unsigned long r7, unsigned long r8,
+ struct pt_regs *regs)
+{
+ printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
+ " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
+ current, smp_processor_id());
+}
+
+void do_show_syscall_exit(unsigned long r3)
+{
+ printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
+}
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