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-rw-r--r--arch/xtensa/kernel/syscalls.c418
1 files changed, 418 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/syscalls.c b/arch/xtensa/kernel/syscalls.c
new file mode 100644
index 0000000..abc8ed6
--- /dev/null
+++ b/arch/xtensa/kernel/syscalls.c
@@ -0,0 +1,418 @@
+/*
+ * arch/xtensa/kernel/syscall.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2000 Silicon Graphics, Inc.
+ * Copyright (C) 1995 - 2000 by Ralf Baechle
+ *
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
+ * Chris Zankel <chris@zankel.net>
+ * Kevin Chea
+ *
+ */
+
+#define DEBUG 0
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/mman.h>
+#include <linux/sched.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/utsname.h>
+#include <linux/unistd.h>
+#include <linux/stringify.h>
+#include <linux/syscalls.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/errno.h>
+#include <asm/ptrace.h>
+#include <asm/signal.h>
+#include <asm/uaccess.h>
+#include <asm/hardirq.h>
+#include <asm/mman.h>
+#include <asm/shmparam.h>
+#include <asm/page.h>
+#include <asm/ipc.h>
+
+extern void do_syscall_trace(void);
+typedef int (*syscall_t)(void *a0,...);
+extern int (*do_syscalls)(struct pt_regs *regs, syscall_t fun,
+ int narg);
+extern syscall_t sys_call_table[];
+extern unsigned char sys_narg_table[];
+
+/*
+ * sys_pipe() is the normal C calling standard for creating a pipe. It's not
+ * the way unix traditional does this, though.
+ */
+
+int sys_pipe(int __user *userfds)
+{
+ int fd[2];
+ int error;
+
+ error = do_pipe(fd);
+ if (!error) {
+ if (copy_to_user(userfds, fd, 2 * sizeof(int)))
+ error = -EFAULT;
+ }
+ return error;
+}
+
+/*
+ * Common code for old and new mmaps.
+ */
+
+static inline long do_mmap2(unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long pgoff)
+{
+ int error = -EBADF;
+ struct file * file = NULL;
+
+ flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+ 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;
+}
+
+unsigned long old_mmap(unsigned long addr, size_t len, int prot,
+ int flags, int fd, off_t offset)
+{
+ return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+}
+
+long sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
+ unsigned long flags, unsigned long fd, unsigned long pgoff)
+{
+ return do_mmap2(addr, len, prot, flags, fd, pgoff);
+}
+
+int sys_fork(struct pt_regs *regs)
+{
+ return do_fork(SIGCHLD, regs->areg[1], regs, 0, NULL, NULL);
+}
+
+int sys_vfork(struct pt_regs *regs)
+{
+ return do_fork(CLONE_VFORK|CLONE_VM|SIGCHLD, regs->areg[1],
+ regs, 0, NULL, NULL);
+}
+
+int sys_clone(struct pt_regs *regs)
+{
+ unsigned long clone_flags;
+ unsigned long newsp;
+ int __user *parent_tidptr, *child_tidptr;
+ clone_flags = regs->areg[4];
+ newsp = regs->areg[3];
+ parent_tidptr = (int __user *)regs->areg[5];
+ child_tidptr = (int __user *)regs->areg[6];
+ if (!newsp)
+ newsp = regs->areg[1];
+ return do_fork(clone_flags,newsp,regs,0,parent_tidptr,child_tidptr);
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+
+int sys_execve(struct pt_regs *regs)
+{
+ int error;
+ char * filename;
+
+ filename = getname((char *) (long)regs->areg[5]);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ goto out;
+ error = do_execve(filename, (char **) (long)regs->areg[3],
+ (char **) (long)regs->areg[4], regs);
+ putname(filename);
+
+out:
+ return error;
+}
+
+int sys_uname(struct old_utsname * name)
+{
+ if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
+ return 0;
+ return -EFAULT;
+}
+
+int sys_olduname(struct oldold_utsname * name)
+{
+ int error;
+
+ if (!name)
+ return -EFAULT;
+ if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
+ return -EFAULT;
+
+ 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);
+
+ return error ? -EFAULT : 0;
+}
+
+
+/*
+ * Build the string table for the builtin "poor man's strace".
+ */
+
+#if DEBUG
+#define SYSCALL(fun, narg) #fun,
+static char *sfnames[] = {
+#include "syscalls.h"
+};
+#undef SYS
+#endif
+
+void system_call (struct pt_regs *regs)
+{
+ syscall_t syscall;
+ unsigned long parm0, parm1, parm2, parm3, parm4, parm5;
+ int nargs, res;
+ unsigned int syscallnr;
+ int ps;
+
+#if DEBUG
+ int i;
+ unsigned long parms[6];
+ char *sysname;
+#endif
+
+ regs->syscall = regs->areg[2];
+
+ do_syscall_trace();
+
+ /* Have to load after syscall_trace because strace
+ * sometimes changes regs->syscall.
+ */
+ syscallnr = regs->syscall;
+
+ parm0 = parm1 = parm2 = parm3 = parm4 = parm5 = 0;
+
+ /* Restore interrupt level to syscall invoker's.
+ * If this were in assembly, we wouldn't disable
+ * interrupts in the first place:
+ */
+ local_save_flags (ps);
+ local_irq_restore((ps & ~XCHAL_PS_INTLEVEL_MASK) |
+ (regs->ps & XCHAL_PS_INTLEVEL_MASK) );
+
+ if (syscallnr > __NR_Linux_syscalls) {
+ regs->areg[2] = -ENOSYS;
+ return;
+ }
+
+ syscall = sys_call_table[syscallnr];
+ nargs = sys_narg_table[syscallnr];
+
+ if (syscall == NULL) {
+ regs->areg[2] = -ENOSYS;
+ return;
+ }
+
+ /* There shouldn't be more than six arguments in the table! */
+
+ if (nargs > 6)
+ panic("Internal error - too many syscall arguments (%d)!\n",
+ nargs);
+
+ /* Linux takes system-call arguments in registers. The ABI
+ * and Xtensa software conventions require the system-call
+ * number in a2. If an argument exists in a2, we move it to
+ * the next available register. Note that for improved
+ * efficiency, we do NOT shift all parameters down one
+ * register to maintain the original order.
+ *
+ * At best case (zero arguments), we just write the syscall
+ * number to a2. At worst case (1 to 6 arguments), we move
+ * the argument in a2 to the next available register, then
+ * write the syscall number to a2.
+ *
+ * For clarity, the following truth table enumerates all
+ * possibilities.
+ *
+ * arguments syscall number arg0, arg1, arg2, arg3, arg4, arg5
+ * --------- -------------- ----------------------------------
+ * 0 a2
+ * 1 a2 a3
+ * 2 a2 a4, a3
+ * 3 a2 a5, a3, a4
+ * 4 a2 a6, a3, a4, a5
+ * 5 a2 a7, a3, a4, a5, a6
+ * 6 a2 a8, a3, a4, a5, a6, a7
+ */
+ if (nargs) {
+ parm0 = regs->areg[nargs+2];
+ parm1 = regs->areg[3];
+ parm2 = regs->areg[4];
+ parm3 = regs->areg[5];
+ parm4 = regs->areg[6];
+ parm5 = regs->areg[7];
+ } else /* nargs == 0 */
+ parm0 = (unsigned long) regs;
+
+#if DEBUG
+ parms[0] = parm0;
+ parms[1] = parm1;
+ parms[2] = parm2;
+ parms[3] = parm3;
+ parms[4] = parm4;
+ parms[5] = parm5;
+
+ sysname = sfnames[syscallnr];
+ if (strncmp(sysname, "sys_", 4) == 0)
+ sysname = sysname + 4;
+
+ printk("\017SYSCALL:I:%x:%d:%s %s(", regs->pc, current->pid,
+ current->comm, sysname);
+ for (i = 0; i < nargs; i++)
+ printk((i>0) ? ", %#lx" : "%#lx", parms[i]);
+ printk(")\n");
+#endif
+
+ res = syscall((void *)parm0, parm1, parm2, parm3, parm4, parm5);
+
+#if DEBUG
+ printk("\017SYSCALL:O:%d:%s %s(",current->pid, current->comm, sysname);
+ for (i = 0; i < nargs; i++)
+ printk((i>0) ? ", %#lx" : "%#lx", parms[i]);
+ if (res < 4096)
+ printk(") = %d\n", res);
+ else
+ printk(") = %#x\n", res);
+#endif /* DEBUG */
+
+ regs->areg[2] = res;
+ do_syscall_trace();
+}
+
+/*
+ * 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 *) fifth);
+ break;
+
+ case SEMGET:
+ ret = sys_semget (first, second, third);
+ break;
+
+ case SEMCTL: {
+ union semun fourth;
+
+ if (ptr && !get_user(fourth.__pad, (void *__user *) ptr))
+ 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 && !copy_from_user(&tmp,
+ (struct ipc_kludge *) ptr,
+ sizeof (tmp)))
+ ret = sys_msgrcv (first, tmp.msgp, second,
+ tmp.msgtyp, third);
+ break;
+ }
+
+ default:
+ ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
+ second, 0, 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;
+ ret = do_shmat (first, (char __user *) ptr, second, &raddr);
+
+ if (!ret)
+ 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;
+}
+
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