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Diffstat (limited to 'arch/arm26/kernel/sys_arm.c')
-rw-r--r--arch/arm26/kernel/sys_arm.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/arch/arm26/kernel/sys_arm.c b/arch/arm26/kernel/sys_arm.c
new file mode 100644
index 00000000000..e7edd201579
--- /dev/null
+++ b/arch/arm26/kernel/sys_arm.c
@@ -0,0 +1,324 @@
+/*
+ * linux/arch/arm26/kernel/sys_arm.c
+ *
+ * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
+ * Copyright (C) 1995, 1996 Russell King.
+ * Copyright (C) 2003 Ian Molton.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the Linux/arm
+ * platform.
+ */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/mm.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/fs.h>
+#include <linux/file.h>
+#include <linux/utsname.h>
+
+#include <asm/uaccess.h>
+#include <asm/ipc.h>
+
+extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
+ unsigned long new_len, unsigned long flags,
+ unsigned long new_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 sys_pipe(unsigned long * 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;
+}
+
+/* common code for old and new mmaps */
+inline long do_mmap2(
+ unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long pgoff)
+{
+ int error = -EINVAL;
+ struct file * file = NULL;
+
+ flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+
+ /*
+ * If we are doing a fixed mapping, and address < PAGE_SIZE,
+ * then deny it.
+ */
+ if (flags & MAP_FIXED && addr < PAGE_SIZE && vectors_base() == 0)
+ goto out;
+
+ error = -EBADF;
+ if (!(flags & MAP_ANONYMOUS)) {
+ file = fget(fd);
+ if (!file)
+ goto out;
+ }
+
+ down_write(&current->mm->mmap_sem);
+ error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+ up_write(&current->mm->mmap_sem);
+
+ if (file)
+ fput(file);
+out:
+ return error;
+}
+
+struct mmap_arg_struct {
+ unsigned long addr;
+ unsigned long len;
+ unsigned long prot;
+ unsigned long flags;
+ unsigned long fd;
+ unsigned long offset;
+};
+
+asmlinkage int old_mmap(struct mmap_arg_struct *arg)
+{
+ int error = -EFAULT;
+ struct mmap_arg_struct a;
+
+ if (copy_from_user(&a, arg, sizeof(a)))
+ goto out;
+
+ error = -EINVAL;
+ if (a.offset & ~PAGE_MASK)
+ goto out;
+
+ error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
+out:
+ return error;
+}
+
+asmlinkage unsigned long
+sys_arm_mremap(unsigned long addr, unsigned long old_len,
+ unsigned long new_len, unsigned long flags,
+ unsigned long new_addr)
+{
+ unsigned long ret = -EINVAL;
+
+ /*
+ * If we are doing a fixed mapping, and address < PAGE_SIZE,
+ * then deny it.
+ */
+ if (flags & MREMAP_FIXED && new_addr < PAGE_SIZE &&
+ vectors_base() == 0)
+ goto out;
+
+ down_write(&current->mm->mmap_sem);
+ ret = do_mremap(addr, old_len, new_len, flags, new_addr);
+ up_write(&current->mm->mmap_sem);
+
+out:
+ return ret;
+}
+
+/*
+ * Perform the select(nd, in, out, ex, tv) and mmap() system
+ * calls.
+ */
+
+struct sel_arg_struct {
+ unsigned long n;
+ fd_set *inp, *outp, *exp;
+ struct timeval *tvp;
+};
+
+asmlinkage int old_select(struct sel_arg_struct *arg)
+{
+ struct sel_arg_struct a;
+
+ if (copy_from_user(&a, arg, sizeof(a)))
+ return -EFAULT;
+ /* sys_select() does the appropriate kernel locking */
+ return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
+}
+
+/*
+ * 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 *ptr, long fifth)
+{
+ int version, ret;
+
+ version = call >> 16; /* hack for backward compatibility */
+ call &= 0xffff;
+
+ switch (call) {
+ case SEMOP:
+ return sys_semop (first, (struct sembuf *)ptr, second);
+ case SEMGET:
+ return sys_semget (first, second, third);
+ case SEMCTL: {
+ union semun fourth;
+ if (!ptr)
+ return -EINVAL;
+ if (get_user(fourth.__pad, (void **) ptr))
+ return -EFAULT;
+ return sys_semctl (first, second, third, fourth);
+ }
+
+ case MSGSND:
+ return sys_msgsnd (first, (struct msgbuf *) ptr,
+ second, third);
+ case MSGRCV:
+ switch (version) {
+ case 0: {
+ struct ipc_kludge tmp;
+ if (!ptr)
+ return -EINVAL;
+ if (copy_from_user(&tmp,(struct ipc_kludge *) ptr,
+ sizeof (tmp)))
+ return -EFAULT;
+ return sys_msgrcv (first, tmp.msgp, second,
+ tmp.msgtyp, third);
+ }
+ default:
+ return sys_msgrcv (first,
+ (struct msgbuf *) ptr,
+ second, fifth, third);
+ }
+ case MSGGET:
+ return sys_msgget ((key_t) first, second);
+ case MSGCTL:
+ return sys_msgctl (first, second, (struct msqid_ds *) ptr);
+
+ case SHMAT:
+ switch (version) {
+ default: {
+ ulong raddr;
+ ret = do_shmat (first, (char *) ptr, second, &raddr);
+ if (ret)
+ return ret;
+ return put_user (raddr, (ulong *) third);
+ }
+ case 1: /* iBCS2 emulator entry point */
+ if (!segment_eq(get_fs(), get_ds()))
+ return -EINVAL;
+ return do_shmat (first, (char *) ptr,
+ second, (ulong *) third);
+ }
+ case SHMDT:
+ return sys_shmdt ((char *)ptr);
+ case SHMGET:
+ return sys_shmget (first, second, third);
+ case SHMCTL:
+ return sys_shmctl (first, second,
+ (struct shmid_ds *) ptr);
+ default:
+ return -EINVAL;
+ }
+}
+
+/* Fork a new task - this creates a new program thread.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage int sys_fork(struct pt_regs *regs)
+{
+ return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
+}
+
+/* Clone a task - this clones the calling program thread.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, struct pt_regs *regs)
+{
+ /*
+ * We don't support SETTID / CLEARTID (FIXME!!! (nicked from arm32))
+ */
+ if (clone_flags & (CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID))
+ return -EINVAL;
+
+ if (!newsp)
+ newsp = regs->ARM_sp;
+
+ return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+}
+
+asmlinkage int sys_vfork(struct pt_regs *regs)
+{
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
+}
+
+/* sys_execve() executes a new program.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage int sys_execve(char *filenamei, char **argv, char **envp, struct pt_regs *regs)
+{
+ int error;
+ char * filename;
+
+ filename = getname(filenamei);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ goto out;
+ error = do_execve(filename, argv, envp, regs);
+ putname(filename);
+out:
+ return error;
+}
+
+/* FIXME - see if this is correct for arm26 */
+long execve(const char *filename, char **argv, char **envp)
+{
+ struct pt_regs regs;
+ int ret;
+ memset(&regs, 0, sizeof(struct pt_regs));
+ ret = do_execve((char *)filename, (char __user * __user *)argv, (char __user * __user *)envp, &regs);
+ if (ret < 0)
+ goto out;
+
+ /*
+ * Save argc to the register structure for userspace.
+ */
+ regs.ARM_r0 = ret;
+
+ /*
+ * We were successful. We won't be returning to our caller, but
+ * instead to user space by manipulating the kernel stack.
+ */
+ asm( "add r0, %0, %1\n\t"
+ "mov r1, %2\n\t"
+ "mov r2, %3\n\t"
+ "bl memmove\n\t" /* copy regs to top of stack */
+ "mov r8, #0\n\t" /* not a syscall */
+ "mov r9, %0\n\t" /* thread structure */
+ "mov sp, r0\n\t" /* reposition stack pointer */
+ "b ret_to_user"
+ :
+ : "r" (current_thread_info()),
+ "Ir" (THREAD_SIZE - 8 - sizeof(regs)),
+ "r" (&regs),
+ "Ir" (sizeof(regs))
+ : "r0", "r1", "r2", "r3", "ip", "memory");
+
+ out:
+ return ret;
+}
+
+EXPORT_SYMBOL(execve);
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