diff options
Diffstat (limited to 'arch/s390/lib/uaccess_std.c')
| -rw-r--r-- | arch/s390/lib/uaccess_std.c | 72 |
1 files changed, 16 insertions, 56 deletions
diff --git a/arch/s390/lib/uaccess_std.c b/arch/s390/lib/uaccess_std.c index f44f0078b354..56a0214e9928 100644 --- a/arch/s390/lib/uaccess_std.c +++ b/arch/s390/lib/uaccess_std.c @@ -11,7 +11,7 @@ #include <linux/errno.h> #include <linux/mm.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <asm/futex.h> #ifndef __s390x__ @@ -28,6 +28,9 @@ #define SLR "slgr" #endif +extern size_t copy_from_user_pt(size_t n, const void __user *from, void *to); +extern size_t copy_to_user_pt(size_t n, void __user *to, const void *from); + size_t copy_from_user_std(size_t size, const void __user *ptr, void *x) { unsigned long tmp1, tmp2; @@ -69,34 +72,11 @@ size_t copy_from_user_std(size_t size, const void __user *ptr, void *x) return size; } -size_t copy_from_user_std_small(size_t size, const void __user *ptr, void *x) +size_t copy_from_user_std_check(size_t size, const void __user *ptr, void *x) { - unsigned long tmp1, tmp2; - - tmp1 = 0UL; - asm volatile( - "0: mvcp 0(%0,%2),0(%1),%3\n" - " "SLR" %0,%0\n" - " j 5f\n" - "1: la %4,255(%1)\n" /* %4 = ptr + 255 */ - " "LHI" %3,-4096\n" - " nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */ - " "SLR" %4,%1\n" - " "CLR" %0,%4\n" /* copy crosses next page boundary? */ - " jnh 5f\n" - "2: mvcp 0(%4,%2),0(%1),%3\n" - " "SLR" %0,%4\n" - " "ALR" %2,%4\n" - "3:"LHI" %4,-1\n" - " "ALR" %4,%0\n" /* copy remaining size, subtract 1 */ - " bras %3,4f\n" - " xc 0(1,%2),0(%2)\n" - "4: ex %4,0(%3)\n" - "5:\n" - EX_TABLE(0b,1b) EX_TABLE(2b,3b) - : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) - : : "cc", "memory"); - return size; + if (size <= 1024) + return copy_from_user_std(size, ptr, x); + return copy_from_user_pt(size, ptr, x); } size_t copy_to_user_std(size_t size, void __user *ptr, const void *x) @@ -130,28 +110,11 @@ size_t copy_to_user_std(size_t size, void __user *ptr, const void *x) return size; } -size_t copy_to_user_std_small(size_t size, void __user *ptr, const void *x) +size_t copy_to_user_std_check(size_t size, void __user *ptr, const void *x) { - unsigned long tmp1, tmp2; - - tmp1 = 0UL; - asm volatile( - "0: mvcs 0(%0,%1),0(%2),%3\n" - " "SLR" %0,%0\n" - " j 3f\n" - "1: la %4,255(%1)\n" /* ptr + 255 */ - " "LHI" %3,-4096\n" - " nr %4,%3\n" /* (ptr + 255) & -4096UL */ - " "SLR" %4,%1\n" - " "CLR" %0,%4\n" /* copy crosses next page boundary? */ - " jnh 3f\n" - "2: mvcs 0(%4,%1),0(%2),%3\n" - " "SLR" %0,%4\n" - "3:\n" - EX_TABLE(0b,1b) EX_TABLE(2b,3b) - : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) - : : "cc", "memory"); - return size; + if (size <= 1024) + return copy_to_user_std(size, ptr, x); + return copy_to_user_pt(size, ptr, x); } size_t copy_in_user_std(size_t size, void __user *to, const void __user *from) @@ -295,8 +258,6 @@ int futex_atomic_op(int op, int __user *uaddr, int oparg, int *old) { int oldval = 0, newval, ret; - inc_preempt_count(); - switch (op) { case FUTEX_OP_SET: __futex_atomic_op("lr %2,%5\n", @@ -321,7 +282,6 @@ int futex_atomic_op(int op, int __user *uaddr, int oparg, int *old) default: ret = -ENOSYS; } - dec_preempt_count(); *old = oldval; return ret; } @@ -343,10 +303,10 @@ int futex_atomic_cmpxchg(int __user *uaddr, int oldval, int newval) } struct uaccess_ops uaccess_std = { - .copy_from_user = copy_from_user_std, - .copy_from_user_small = copy_from_user_std_small, - .copy_to_user = copy_to_user_std, - .copy_to_user_small = copy_to_user_std_small, + .copy_from_user = copy_from_user_std_check, + .copy_from_user_small = copy_from_user_std, + .copy_to_user = copy_to_user_std_check, + .copy_to_user_small = copy_to_user_std, .copy_in_user = copy_in_user_std, .clear_user = clear_user_std, .strnlen_user = strnlen_user_std, |