fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / arch / m32r / kernel / sys_m32r.c

diff --git a/arch/m32r/kernel/sys_m32r.c b/arch/m32r/kernel/sys_m32r.c
index f34fa19..b4e7bcb 100644 (file)
--- a/arch/m32r/kernel/sys_m32r.c
+++ b/arch/m32r/kernel/sys_m32r.c
@@ -7,7 +7,6 @@
  * Taken from i386 version.
  */
 
-#include <linux/config.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
@@ -26,45 +25,56 @@
 #include <asm/cachectl.h>
 #include <asm/cacheflush.h>
 #include <asm/ipc.h>
+#include <asm/syscall.h>
+#include <asm/unistd.h>
 
 /*
  * sys_tas() - test-and-set
- * linuxthreads testing version
  */
-#ifndef CONFIG_SMP
-asmlinkage int sys_tas(int *addr)
+asmlinkage int sys_tas(int __user *addr)
 {
        int oldval;
-       unsigned long flags;
 
        if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
                return -EFAULT;
-       local_irq_save(flags);
-       oldval = *addr;
-       *addr = 1;
-       local_irq_restore(flags);
-       return oldval;
-}
-#else /* CONFIG_SMP */
-#include <linux/spinlock.h>
-
-static spinlock_t tas_lock = SPIN_LOCK_UNLOCKED;
-
-asmlinkage int sys_tas(int *addr)
-{
-       int oldval;
 
-       if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
-               return -EFAULT;
-
-       spin_lock(&tas_lock);
-       oldval = *addr;
-       *addr = 1;
-       spin_unlock(&tas_lock);
+       /* atomic operation:
+        *   oldval = *addr; *addr = 1;
+        */
+       __asm__ __volatile__ (
+               DCACHE_CLEAR("%0", "r4", "%1")
+               "       .fillinsn\n"
+               "1:\n"
+               "       lock    %0, @%1     ->  unlock  %2, @%1\n"
+               "2:\n"
+               /* NOTE:
+                *   The m32r processor can accept interrupts only
+                *   at the 32-bit instruction boundary.
+                *   So, in the above code, the "unlock" instruction
+                *   can be executed continuously after the "lock"
+                *   instruction execution without any interruptions.
+                */
+               ".section .fixup,\"ax\"\n"
+               "       .balign 4\n"
+               "3:     ldi     %0, #%3\n"
+               "       seth    r14, #high(2b)\n"
+               "       or3     r14, r14, #low(2b)\n"
+               "       jmp     r14\n"
+               ".previous\n"
+               ".section __ex_table,\"a\"\n"
+               "       .balign 4\n"
+               "       .long 1b,3b\n"
+               ".previous\n"
+               : "=&r" (oldval)
+               : "r" (addr), "r" (1), "i"(-EFAULT)
+               : "r14", "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+                 , "r4"
+#endif /* CONFIG_CHIP_M32700_TS1 */
+       );
 
        return oldval;
 }
-#endif /* CONFIG_SMP */
 
 /*
  * sys_pipe() is the normal C calling standard for creating
@@ -80,7 +90,7 @@ sys_pipe(unsigned long r0, unsigned long r1, unsigned long r2,
 
        error = do_pipe(fd);
        if (!error) {
-               if (copy_to_user((void *)r0, (void *)fd, 2*sizeof(int)))
+               if (copy_to_user((void __user *)r0, fd, 2*sizeof(int)))
                        error = -EFAULT;
        }
        return error;
@@ -171,9 +181,9 @@ asmlinkage int sys_ipc(uint call, int first, int second,
        case SHMAT: {
                ulong raddr;
 
-               if ((ret = verify_area(VERIFY_WRITE, (ulong __user *) third,
-                                     sizeof(ulong))))
-                       return ret;
+               if (!access_ok(VERIFY_WRITE, (ulong __user *) third,
+                                     sizeof(ulong)))
+                       return -EFAULT;
                ret = do_shmat (first, (char __user *) ptr, second, &raddr);
                if (ret)
                        return ret;
@@ -191,13 +201,13 @@ asmlinkage int sys_ipc(uint call, int first, int second,
        }
 }
 
-asmlinkage int sys_uname(struct old_utsname * name)
+asmlinkage int sys_uname(struct old_utsname __user * name)
 {
        int err;
        if (!name)
                return -EFAULT;
        down_read(&uts_sem);
-       err=copy_to_user(name, &system_utsname, sizeof (*name));
+       err = copy_to_user(name, utsname(), sizeof (*name));
        up_read(&uts_sem);
        return err?-EFAULT:0;
 }
@@ -215,3 +225,21 @@ asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
        return -ENOSYS;
 }
 
+/*
+ * Do a system call from kernel instead of calling sys_execve so we
+ * end up with proper pt_regs.
+ */
+int kernel_execve(const char *filename, char *const argv[], char *const envp[])
+{
+       register long __scno __asm__ ("r7") = __NR_execve;
+       register long __arg3 __asm__ ("r2") = (long)(envp);
+       register long __arg2 __asm__ ("r1") = (long)(argv);
+       register long __res __asm__ ("r0") = (long)(filename);
+       __asm__ __volatile__ (
+               "trap #" SYSCALL_VECTOR "|| nop"
+               : "=r" (__res)
+               : "r" (__scno), "0" (__res), "r" (__arg2),
+                       "r" (__arg3)
+               : "memory");
+       return __res;
+}