fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / arch / sparc / kernel / sys_sparc.c

diff --git a/arch/sparc/kernel/sys_sparc.c b/arch/sparc/kernel/sys_sparc.c
index 8fa541c..a954a0c 100644 (file)
--- a/arch/sparc/kernel/sys_sparc.c
+++ b/arch/sparc/kernel/sys_sparc.c
@@ -21,10 +21,10 @@
 #include <linux/utsname.h>
 #include <linux/smp.h>
 #include <linux/smp_lock.h>
-#include <linux/vs_cvirt.h>
 
 #include <asm/uaccess.h>
 #include <asm/ipc.h>
+#include <asm/unistd.h>
 
 /* #define DEBUG_UNIMP_SYSCALL */
 
@@ -220,6 +220,21 @@ out:
        return err;
 }
 
+int sparc_mmap_check(unsigned long addr, unsigned long len, unsigned long flags)
+{
+       if (ARCH_SUN4C_SUN4 &&
+           (len > 0x20000000 ||
+            ((flags & MAP_FIXED) &&
+             addr < 0xe0000000 && addr + len > 0x20000000)))
+               return -EINVAL;
+
+       /* See asm-sparc/uaccess.h */
+       if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
+               return -EINVAL;
+
+       return 0;
+}
+
 /* Linux version of mmap */
 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
        unsigned long prot, unsigned long flags, unsigned long fd,
@@ -234,25 +249,13 @@ static unsigned long do_mmap2(unsigned long addr, unsigned long len,
                        goto out;
        }
 
-       retval = -EINVAL;
        len = PAGE_ALIGN(len);
-       if (ARCH_SUN4C_SUN4 &&
-           (len > 0x20000000 ||
-            ((flags & MAP_FIXED) &&
-             addr < 0xe0000000 && addr + len > 0x20000000)))
-               goto out_putf;
-
-       /* See asm-sparc/uaccess.h */
-       if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
-               goto out_putf;
-
        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 
        down_write(&current->mm->mmap_sem);
        retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
        up_write(&current->mm->mmap_sem);
 
-out_putf:
        if (file)
                fput(file);
 out:
@@ -466,21 +469,45 @@ sys_rt_sigaction(int sig,
 
 asmlinkage int sys_getdomainname(char __user *name, int len)
 {
-       int nlen;
-       int err = -EFAULT;
+       int nlen, err;
        
+       if (len < 0)
+               return -EINVAL;
+
        down_read(&uts_sem);
        
-       nlen = strlen(vx_new_uts(domainname)) + 1;
-
-       if (nlen < len)
-               len = nlen;
-       if (len > __NEW_UTS_LEN)
-               goto done;
-       if (copy_to_user(name, vx_new_uts(domainname), len))
-               goto done;
-       err = 0;
-done:
+       nlen = strlen(utsname()->domainname) + 1;
+       err = -EINVAL;
+       if (nlen > len)
+               goto out;
+
+       err = -EFAULT;
+       if (!copy_to_user(name, utsname()->domainname, nlen))
+               err = 0;
+
+out:
        up_read(&uts_sem);
        return err;
 }
+
+/*
+ * 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[])
+{
+       long __res;
+       register long __g1 __asm__ ("g1") = __NR_execve;
+       register long __o0 __asm__ ("o0") = (long)(filename);
+       register long __o1 __asm__ ("o1") = (long)(argv);
+       register long __o2 __asm__ ("o2") = (long)(envp);
+       asm volatile ("t 0x10\n\t"
+                     "bcc 1f\n\t"
+                     "mov %%o0, %0\n\t"
+                     "sub %%g0, %%o0, %0\n\t"
+                     "1:\n\t"
+                     : "=r" (__res), "=&r" (__o0)
+                     : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
+                     : "cc");
+       return __res;
+}