drm/edid: allow certain bogus edids to hit a fixup path rather than fail

[safe/jmp/linux-2.6] / arch / s390 / lib / uaccess_mvcos.c

diff --git a/arch/s390/lib/uaccess_mvcos.c b/arch/s390/lib/uaccess_mvcos.c
index f9a23d5..60455f1 100644 (file)
--- a/arch/s390/lib/uaccess_mvcos.c
+++ b/arch/s390/lib/uaccess_mvcos.c
@@ -12,6 +12,7 @@
 #include <linux/mm.h>
 #include <asm/uaccess.h>
 #include <asm/futex.h>
+#include "uaccess.h"
 
 #ifndef __s390x__
 #define AHI    "ahi"
@@ -27,10 +28,7 @@
 #define SLR    "slgr"
 #endif
 
-extern size_t copy_from_user_std(size_t, const void __user *, void *);
-extern size_t copy_to_user_std(size_t, void __user *, const void *);
-
-size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
+static size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
 {
        register unsigned long reg0 asm("0") = 0x81UL;
        unsigned long tmp1, tmp2;
@@ -38,7 +36,7 @@ size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
        tmp1 = -4096UL;
        asm volatile(
                "0: .insn ss,0xc80000000000,0(%0,%2),0(%1),0\n"
-               "   jz    7f\n"
+               "9: jz    7f\n"
                "1:"ALR"  %0,%3\n"
                "  "SLR"  %1,%3\n"
                "  "SLR"  %2,%3\n"
@@ -49,7 +47,7 @@ size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
                "  "CLR"  %0,%4\n"      /* copy crosses next page boundary? */
                "   jnh   4f\n"
                "3: .insn ss,0xc80000000000,0(%4,%2),0(%1),0\n"
-               "  "SLR"  %0,%4\n"
+               "10:"SLR"  %0,%4\n"
                "  "ALR"  %2,%4\n"
                "4:"LHI"  %4,-1\n"
                "  "ALR"  %4,%0\n"      /* copy remaining size, subtract 1 */
@@ -63,20 +61,20 @@ size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
                "   j     8f\n"
                "7:"SLR"  %0,%0\n"
                "8: \n"
-               EX_TABLE(0b,2b) EX_TABLE(3b,4b)
+               EX_TABLE(0b,2b) EX_TABLE(3b,4b) EX_TABLE(9b,2b) EX_TABLE(10b,4b)
                : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
                : "d" (reg0) : "cc", "memory");
        return size;
 }
 
-size_t copy_from_user_mvcos_check(size_t size, const void __user *ptr, void *x)
+static size_t copy_from_user_mvcos_check(size_t size, const void __user *ptr, void *x)
 {
        if (size <= 256)
                return copy_from_user_std(size, ptr, x);
        return copy_from_user_mvcos(size, ptr, x);
 }
 
-size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
+static size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
 {
        register unsigned long reg0 asm("0") = 0x810000UL;
        unsigned long tmp1, tmp2;
@@ -84,7 +82,7 @@ size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
        tmp1 = -4096UL;
        asm volatile(
                "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n"
-               "   jz    4f\n"
+               "6: jz    4f\n"
                "1:"ALR"  %0,%3\n"
                "  "SLR"  %1,%3\n"
                "  "SLR"  %2,%3\n"
@@ -95,24 +93,26 @@ size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
                "  "CLR"  %0,%4\n"      /* copy crosses next page boundary? */
                "   jnh   5f\n"
                "3: .insn ss,0xc80000000000,0(%4,%1),0(%2),0\n"
-               "  "SLR"  %0,%4\n"
+               "7:"SLR"  %0,%4\n"
                "   j     5f\n"
                "4:"SLR"  %0,%0\n"
                "5: \n"
-               EX_TABLE(0b,2b) EX_TABLE(3b,5b)
+               EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b)
                : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
                : "d" (reg0) : "cc", "memory");
        return size;
 }
 
-size_t copy_to_user_mvcos_check(size_t size, void __user *ptr, const void *x)
+static size_t copy_to_user_mvcos_check(size_t size, void __user *ptr,
+                                      const void *x)
 {
        if (size <= 256)
                return copy_to_user_std(size, ptr, x);
        return copy_to_user_mvcos(size, ptr, x);
 }
 
-size_t copy_in_user_mvcos(size_t size, void __user *to, const void __user *from)
+static size_t copy_in_user_mvcos(size_t size, void __user *to,
+                                const void __user *from)
 {
        register unsigned long reg0 asm("0") = 0x810081UL;
        unsigned long tmp1, tmp2;
@@ -134,7 +134,7 @@ size_t copy_in_user_mvcos(size_t size, void __user *to, const void __user *from)
        return size;
 }
 
-size_t clear_user_mvcos(size_t size, void __user *to)
+static size_t clear_user_mvcos(size_t size, void __user *to)
 {
        register unsigned long reg0 asm("0") = 0x810000UL;
        unsigned long tmp1, tmp2;
@@ -162,10 +162,43 @@ size_t clear_user_mvcos(size_t size, void __user *to)
        return size;
 }
 
-extern size_t strnlen_user_std(size_t, const char __user *);
-extern size_t strncpy_from_user_std(size_t, const char __user *, char *);
-extern int futex_atomic_op(int, int __user *, int, int *);
-extern int futex_atomic_cmpxchg(int __user *, int, int);
+static size_t strnlen_user_mvcos(size_t count, const char __user *src)
+{
+       char buf[256];
+       int rc;
+       size_t done, len, len_str;
+
+       done = 0;
+       do {
+               len = min(count - done, (size_t) 256);
+               rc = uaccess.copy_from_user(len, src + done, buf);
+               if (unlikely(rc == len))
+                       return 0;
+               len -= rc;
+               len_str = strnlen(buf, len);
+               done += len_str;
+       } while ((len_str == len) && (done < count));
+       return done + 1;
+}
+
+static size_t strncpy_from_user_mvcos(size_t count, const char __user *src,
+                                     char *dst)
+{
+       int rc;
+       size_t done, len, len_str;
+
+       done = 0;
+       do {
+               len = min(count - done, (size_t) 4096);
+               rc = uaccess.copy_from_user(len, src + done, dst);
+               if (unlikely(rc == len))
+                       return -EFAULT;
+               len -= rc;
+               len_str = strnlen(dst, len);
+               done += len_str;
+       } while ((len_str == len) && (done < count));
+       return done;
+}
 
 struct uaccess_ops uaccess_mvcos = {
        .copy_from_user = copy_from_user_mvcos_check,
@@ -176,6 +209,19 @@ struct uaccess_ops uaccess_mvcos = {
        .clear_user = clear_user_mvcos,
        .strnlen_user = strnlen_user_std,
        .strncpy_from_user = strncpy_from_user_std,
-       .futex_atomic_op = futex_atomic_op,
-       .futex_atomic_cmpxchg = futex_atomic_cmpxchg,
+       .futex_atomic_op = futex_atomic_op_std,
+       .futex_atomic_cmpxchg = futex_atomic_cmpxchg_std,
+};
+
+struct uaccess_ops uaccess_mvcos_switch = {
+       .copy_from_user = copy_from_user_mvcos,
+       .copy_from_user_small = copy_from_user_mvcos,
+       .copy_to_user = copy_to_user_mvcos,
+       .copy_to_user_small = copy_to_user_mvcos,
+       .copy_in_user = copy_in_user_mvcos,
+       .clear_user = clear_user_mvcos,
+       .strnlen_user = strnlen_user_mvcos,
+       .strncpy_from_user = strncpy_from_user_mvcos,
+       .futex_atomic_op = futex_atomic_op_pt,
+       .futex_atomic_cmpxchg = futex_atomic_cmpxchg_pt,
 };