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-rw-r--r--include/asm-s390/uaccess.h519
1 files changed, 519 insertions, 0 deletions
diff --git a/include/asm-s390/uaccess.h b/include/asm-s390/uaccess.h
new file mode 100644
index 000000000..9f448fc50
--- /dev/null
+++ b/include/asm-s390/uaccess.h
@@ -0,0 +1,519 @@
+/*
+ * include/asm-s390/uaccess.h
+ *
+ * S390 version
+ * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Hartmut Penner (hp@de.ibm.com),
+ * Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * Derived from "include/asm-i386/uaccess.h"
+ */
+#ifndef __S390_UACCESS_H
+#define __S390_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/sched.h>
+#if 0
+#include <asm/segment.h>
+#endif
+#define VERIFY_READ 0
+#define VERIFY_WRITE 1
+
+
+/*
+ * The fs value determines whether argument validity checking should be
+ * performed or not. If get_fs() == USER_DS, checking is performed, with
+ * get_fs() == KERNEL_DS, checking is bypassed.
+ *
+ * For historical reasons, these macros are grossly misnamed.
+ */
+
+#define MAKE_MM_SEG(s,a) ((mm_segment_t) { (s),(a) })
+
+
+#define KERNEL_DS MAKE_MM_SEG(0x7FFFFFFF,0)
+#define USER_DS MAKE_MM_SEG(PAGE_OFFSET,1)
+
+#define get_ds() (KERNEL_DS)
+#define get_fs() (current->thread.fs)
+#define set_fs(x) ({asm volatile("sar 4,%0"::"a" (x.acc4)); \
+ current->thread.fs = (x);})
+
+#define segment_eq(a,b) ((a).acc4 == (b).acc4)
+
+
+#define __access_ok(addr,size) ((((long) addr + size)&0x7FFFFFFFL) < current->addr_limit.seg)
+
+#define access_ok(type,addr,size) __access_ok(addr,size)
+
+extern inline int verify_area(int type, const void * addr, unsigned long size)
+{
+ return access_ok(type,addr,size)?0:-EFAULT;
+}
+
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue. No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path. This means when everything is well,
+ * we don't even have to jump over them. Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+struct exception_table_entry
+{
+ unsigned long insn, fixup;
+};
+
+/* Returns 0 if exception not found and fixup otherwise. */
+extern unsigned long search_exception_table(unsigned long);
+
+
+/*
+ * These are the main single-value transfer routines. They automatically
+ * use the right size if we just have the right pointer type.
+ */
+
+extern inline int __put_user_asm_4(__u32 x, void *ptr)
+{
+ int err;
+
+ __asm__ __volatile__ ( " iac 1\n"
+ " sr %1,%1\n"
+ " la 4,%0\n"
+ " sacf 512\n"
+ "0: st %2,0(4)\n"
+ " sacf 0(1)\n"
+ "1:\n"
+ ".section .fixup,\"ax\"\n"
+ "2: sacf 0(1)\n"
+ " lhi %1,%h3\n"
+ " bras 4,3f\n"
+ " .long 1b\n"
+ "3: l 4,0(4)\n"
+ " br 4\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,2b\n"
+ ".previous"
+ : "=m" (*((__u32*) ptr)) , "=&d" (err)
+ : "d" (x), "K" (-EFAULT)
+ : "1", "4" );
+ return err;
+}
+
+extern inline int __put_user_asm_2(__u16 x, void *ptr)
+{
+ int err;
+
+ __asm__ __volatile__ ( " iac 1\n"
+ " sr %1,%1\n"
+ " la 4,%0\n"
+ " sacf 512\n"
+ "0: sth %2,0(4)\n"
+ " sacf 0(1)\n"
+ "1:\n"
+ ".section .fixup,\"ax\"\n"
+ "2: sacf 0(1)\n"
+ " lhi %1,%h3\n"
+ " bras 4,3f\n"
+ " .long 1b\n"
+ "3: l 4,0(4)\n"
+ " br 4\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,2b\n"
+ ".previous"
+ : "=m" (*((__u16*) ptr)) , "=&d" (err)
+ : "d" (x), "K" (-EFAULT)
+ : "1", "4" );
+ return err;
+}
+
+extern inline int __put_user_asm_1(__u8 x, void *ptr)
+{
+ int err;
+
+ __asm__ __volatile__ ( " iac 1\n"
+ " sr %1,%1\n"
+ " la 4,%0\n"
+ " sacf 512\n"
+ "0: stc %2,0(4)\n"
+ " sacf 0(1)\n"
+ "1:\n"
+ ".section .fixup,\"ax\"\n"
+ "2: sacf 0(1)\n"
+ " lhi %1,%h3\n"
+ " bras 4,3f\n"
+ " .long 1b\n"
+ "3: l 4,0(4)\n"
+ " br 4\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,2b\n"
+ ".previous"
+ : "=m" (*((__u8*) ptr)) , "=&d" (err)
+ : "d" (x), "K" (-EFAULT)
+ : "1", "4" );
+ return err;
+}
+
+/*
+ * (u8)(u32) ... autsch, but that the only way we can suppress the
+ * warnings when compiling binfmt_elf.c
+ */
+#define __put_user(x, ptr) \
+({ \
+ int __pu_err; \
+ switch (sizeof (*(ptr))) { \
+ case 1: \
+ __pu_err = __put_user_asm_1((__u8)(__u32)x,ptr);\
+ break; \
+ case 2: \
+ __pu_err = __put_user_asm_2((__u16)(__u32)x,ptr);\
+ break; \
+ case 4: \
+ __pu_err = __put_user_asm_4((__u32) x,ptr);\
+ break; \
+ default: \
+ __pu_err = __put_user_bad(); \
+ break; \
+ } \
+ __pu_err; \
+})
+
+#define put_user(x, ptr) \
+({ \
+ long __pu_err = -EFAULT; \
+ __typeof__(*(ptr)) *__pu_addr = (ptr); \
+ __typeof__(x) __x = (x); \
+ if (__access_ok((long)__pu_addr,sizeof(*(ptr)))) { \
+ __pu_err = 0; \
+ __put_user((__x), (__pu_addr)); \
+ } \
+ __pu_err; \
+})
+
+extern int __put_user_bad(void);
+
+
+#define __get_user_asm_4(x, ptr, err) \
+({ \
+ __asm__ __volatile__ ( " iac 1\n" \
+ " sr %1,%1\n" \
+ " la 4,%2\n" \
+ " sacf 512\n" \
+ "0: l %0,0(4)\n" \
+ " sacf 0(1)\n" \
+ "1:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "2: sacf 0(1)\n" \
+ " lhi %1,%h3\n" \
+ " bras 4,3f\n" \
+ " .long 1b\n" \
+ "3: l 4,0(4)\n" \
+ " br 4\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 0b,2b\n" \
+ ".previous" \
+ : "=d" (x) , "=&d" (err) \
+ : "m" (*(__u32*) ptr), "K" (-EFAULT) \
+ : "1", "4" ); \
+})
+
+#define __get_user_asm_2(x, ptr, err) \
+({ \
+ __asm__ __volatile__ ( " iac 1\n" \
+ " sr %1,%1\n" \
+ " la 4,%2\n" \
+ " sacf 512\n" \
+ "0: lh %0,0(4)\n" \
+ " sacf 0(1)\n" \
+ "1:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "2: sacf 0(1)\n" \
+ " lhi %1,%h3\n" \
+ " bras 4,3f\n" \
+ " .long 1b\n" \
+ "3: l 4,0(4)\n" \
+ " br 4\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 0b,2b\n" \
+ ".previous" \
+ : "=d" (x) , "=&d" (err) \
+ : "m" (*(__u16*) ptr), "K" (-EFAULT) \
+ : "1", "4" ); \
+})
+
+#define __get_user_asm_1(x, ptr, err) \
+({ \
+ __asm__ __volatile__ ( " iac 1\n" \
+ " sr %1,%1\n" \
+ " la 4,%2\n" \
+ " sr %0,%0\n" \
+ " sacf 512\n" \
+ "0: ic %0,0(4)\n" \
+ " sacf 0(1)\n" \
+ "1:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "2: sacf 0(1)\n" \
+ " lhi %1,%h3\n" \
+ " bras 4,3f\n" \
+ " .long 1b\n" \
+ "3: l 4,0(4)\n" \
+ " br 4\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 0b,2b\n" \
+ ".previous" \
+ : "=d" (x) , "=&d" (err) \
+ : "m" (*(__u8*) ptr), "K" (-EFAULT) \
+ : "1", "4" ); \
+})
+
+#define __get_user(x, ptr) \
+({ \
+ int __gu_err; \
+ switch (sizeof(*(ptr))) { \
+ case 1: \
+ __get_user_asm_1(x,ptr,__gu_err); \
+ break; \
+ case 2: \
+ __get_user_asm_2(x,ptr,__gu_err); \
+ break; \
+ case 4: \
+ __get_user_asm_4(x,ptr,__gu_err); \
+ break; \
+ default: \
+ (x) = 0; \
+ __gu_err = __get_user_bad(); \
+ break; \
+ } \
+ __gu_err; \
+})
+
+#define get_user(x, ptr) \
+({ \
+ long __gu_err = -EFAULT; \
+ __typeof__(ptr) __gu_addr = (ptr); \
+ __typeof__(x) __x; \
+ if (__access_ok((long)__gu_addr,sizeof(*(ptr)))) { \
+ __gu_err = 0; \
+ __get_user((__x), (__gu_addr)); \
+ (x) = __x; \
+ } \
+ else \
+ (x) = 0; \
+ __gu_err; \
+})
+
+extern int __get_user_bad(void);
+
+/*
+ * access register are set up, that 4 points to secondary (user) , 2 to primary (kernel)
+ */
+
+extern inline unsigned long
+__copy_to_user_asm(void* to, const void* from, long n)
+{
+
+ __asm__ __volatile__ ( " iac 1\n"
+ " lr 2,%2\n"
+ " lr 4,%1\n"
+ " lr 3,%0\n"
+ " lr 5,3\n"
+ " sacf 512\n"
+ "0: mvcle 4,2,0\n"
+ " jo 0b\n"
+ "1: sacf 0(1)\n"
+ " lr %0,3\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,1b\n"
+ ".previous"
+ : "+&d" (n) : "d" (to), "d" (from)
+ : "1", "2", "3", "4", "5" );
+ return n;
+}
+
+#define __copy_to_user(to, from, n) \
+({ \
+ __copy_to_user_asm(to,from,n); \
+})
+
+#define copy_to_user(to, from, n) \
+({ \
+ long err = 0; \
+ __typeof__(n) __n = (n); \
+ if (__access_ok(to,__n)) { \
+ err = __copy_to_user_asm(to,from,__n); \
+ } \
+ else \
+ err = __n; \
+ err; \
+})
+
+extern inline unsigned long
+__copy_from_user_asm(void* to, const void* from, long n)
+{
+ __asm__ __volatile__ ( " iac 1\n"
+ " lr 2,%1\n"
+ " lr 4,%2\n"
+ " lr 3,%0\n"
+ " lr 5,3\n"
+ " sacf 512\n"
+ "0: mvcle 2,4,0\n"
+ " jo 0b\n"
+ "1: sacf 0(1)\n"
+ " lr %0,3\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,1b\n"
+ ".previous"
+ : "+&d" (n) : "d" (to), "d" (from)
+ : "1", "2", "3", "4", "5" );
+ return n;
+}
+
+
+#define __copy_from_user(to, from, n) \
+({ \
+ __copy_from_user_asm(to,from,n); \
+})
+
+#define copy_from_user(to, from, n) \
+({ \
+ long err = 0; \
+ __typeof__(n) __n = (n); \
+ if (__access_ok(from,__n)) { \
+ err = __copy_from_user_asm(to,from,__n); \
+ } \
+ else \
+ err = __n; \
+ err; \
+})
+
+#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; })
+
+#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; })
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+
+static inline long
+strncpy_from_user(char *dst, const char *src, long count)
+{
+ int len;
+ __asm__ __volatile__ ( " iac 1\n"
+ " slr %0,%0\n"
+ " lr 2,%1\n"
+ " lr 4,%2\n"
+ " slr 3,3\n"
+ " sacf 512\n"
+ "0: ic 3,0(%0,4)\n"
+ "1: stc 3,0(%0,2)\n"
+ " ltr 3,3\n"
+ " jz 2f\n"
+ " ahi %0,1\n"
+ " clr %0,%3\n"
+ " jl 0b\n"
+ "2: sacf 0(1)\n"
+ ".section .fixup,\"ax\"\n"
+ "3: lhi %0,%h4\n"
+ " basr 3,0\n"
+ " l 3,4f-.(3)\n"
+ " br 3\n"
+ "4: .long 2b\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,3b\n"
+ " .long 1b,3b\n"
+ ".previous"
+ : "=&a" (len)
+ : "a" (dst), "d" (src), "d" (count),
+ "K" (-EFAULT)
+ : "1", "2", "3", "4", "memory" );
+ return len;
+}
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 for error
+ */
+static inline unsigned long
+strnlen_user(const char * src, unsigned long n)
+{
+ __asm__ __volatile__ (" iac 1\n"
+ " alr %0,%1\n"
+ " slr 0,0\n"
+ " lr 4,%1\n"
+ " sacf 512\n"
+ "0: srst %0,4\n"
+ " jo 0b\n"
+ " slr %0,%1\n"
+ " ahi %0,1\n"
+ " sacf 0(1)\n"
+ "1:\n"
+ ".section .fixup,\"ax\"\n"
+ "2: sacf 0(1)\n"
+ " slr %0,%0\n"
+ " bras 4,3f\n"
+ " .long 1b\n"
+ "3: l 4,0(4)\n"
+ " br 4\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,2b\n"
+ ".previous"
+ : "+&a" (n) : "d" (src)
+ : "cc", "0", "1", "4" );
+ return n;
+}
+#define strlen_user(str) strnlen_user(str, ~0UL)
+
+/*
+ * Zero Userspace
+ */
+
+static inline unsigned long
+clear_user(void *to, unsigned long n)
+{
+ __asm__ __volatile__ ( " iac 1\n"
+ " sacf 512\n"
+ " lr 4,%1\n"
+ " lr 5,%0\n"
+ " sr 2,2\n"
+ " sr 3,3\n"
+ "0: mvcle 4,2,0\n"
+ " jo 0b\n"
+ "1: sacf 0(1)\n"
+ " lr %0,3\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,1b\n"
+ ".previous"
+ : "+&a" (n)
+ : "a" (to)
+ : "cc", "1", "2", "3", "4", "5" );
+ return n;
+}
+
+#endif /* _S390_UACCESS_H */
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