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-rw-r--r--arch/ppc/kernel/syscalls.c272
1 files changed, 272 insertions, 0 deletions
diff --git a/arch/ppc/kernel/syscalls.c b/arch/ppc/kernel/syscalls.c
new file mode 100644
index 000000000000..124313ce3c09
--- /dev/null
+++ b/arch/ppc/kernel/syscalls.c
@@ -0,0 +1,272 @@
+/*
+ * arch/ppc/kernel/sys_ppc.c
+ *
+ * PowerPC version
+ * 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/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/syscalls.h>
+#include <linux/mman.h>
+#include <linux/sys.h>
+#include <linux/ipc.h>
+#include <linux/utsname.h>
+#include <linux/file.h>
+#include <linux/unistd.h>
+
+#include <asm/uaccess.h>
+#include <asm/ipc.h>
+#include <asm/semaphore.h>
+
+void
+check_bugs(void)
+{
+}
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly.
+ */
+int
+sys_ipc (uint call, int first, int second, int 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,
+ second, NULL);
+ break;
+ case SEMTIMEDOP:
+ ret = sys_semtimedop (first, (struct sembuf __user *)ptr,
+ second, (const struct timespec __user *) fifth);
+ break;
+ case SEMGET:
+ ret = sys_semget (first, second, third);
+ break;
+ case SEMCTL: {
+ union semun fourth;
+
+ if (!ptr)
+ break;
+ if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
+ || (ret = get_user(fourth.__pad, (void __user *__user *)ptr)))
+ break;
+ ret = sys_semctl (first, second, third, fourth);
+ break;
+ }
+ case MSGSND:
+ ret = sys_msgsnd (first, (struct msgbuf __user *) ptr, second, third);
+ break;
+ case MSGRCV:
+ switch (version) {
+ case 0: {
+ struct ipc_kludge tmp;
+
+ if (!ptr)
+ break;
+ if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
+ || (ret = copy_from_user(&tmp,
+ (struct ipc_kludge __user *) ptr,
+ sizeof (tmp)) ? -EFAULT : 0))
+ break;
+ ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
+ third);
+ break;
+ }
+ default:
+ ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
+ second, fifth, third);
+ break;
+ }
+ break;
+ case MSGGET:
+ ret = sys_msgget ((key_t) first, second);
+ break;
+ case MSGCTL:
+ ret = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
+ break;
+ case SHMAT: {
+ ulong raddr;
+
+ if ((ret = access_ok(VERIFY_WRITE, (ulong __user *) third,
+ sizeof(ulong)) ? 0 : -EFAULT))
+ break;
+ ret = do_shmat (first, (char __user *) ptr, 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, second, third);
+ break;
+ case SHMCTL:
+ ret = sys_shmctl (first, 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 pgoff)
+{
+ struct file * file = NULL;
+ int ret = -EBADF;
+
+ flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+ if (!(flags & MAP_ANONYMOUS)) {
+ if (!(file = fget(fd)))
+ goto out;
+ }
+
+ down_write(&current->mm->mmap_sem);
+ ret = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+ 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);
+}
+
+unsigned long sys_mmap(unsigned long addr, size_t len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, off_t offset)
+{
+ int err = -EINVAL;
+
+ if (offset & ~PAGE_MASK)
+ goto out;
+
+ err = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+out:
+ return err;
+}
+
+/*
+ * 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);
+}
+
+int sys_uname(struct old_utsname __user * name)
+{
+ int err = -EFAULT;
+
+ down_read(&uts_sem);
+ if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
+ err = 0;
+ up_read(&uts_sem);
+ return err;
+}
+
+int sys_olduname(struct oldold_utsname __user * name)
+{
+ int error;
+
+ if (!name)
+ return -EFAULT;
+ 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 = __put_user(0,name->machine+__OLD_UTS_LEN);
+ up_read(&uts_sem);
+
+ error = error ? -EFAULT : 0;
+ return error;
+}
+
+/*
+ * We put the arguments in a different order so we only use 6
+ * registers for arguments, rather than 7 as sys_fadvise64_64 needs
+ * (because `offset' goes in r5/r6).
+ */
+long ppc_fadvise64_64(int fd, int advice, loff_t offset, loff_t len)
+{
+ return sys_fadvise64_64(fd, offset, len, advice);
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.