Release 4.14 arch/s390/include/asm/uaccess.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* S390 version
* Copyright IBM Corp. 1999, 2000
* 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 <asm/processor.h>
#include <asm/ctl_reg.h>
#include <asm/extable.h>
/*
* 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(a) ((mm_segment_t) { (a) })
#define KERNEL_DS MAKE_MM_SEG(0)
#define USER_DS MAKE_MM_SEG(1)
#define get_ds() (KERNEL_DS)
#define get_fs() (current->thread.mm_segment)
#define segment_eq(a,b) ((a).ar4 == (b).ar4)
static inline void set_fs(mm_segment_t fs)
{
current->thread.mm_segment = fs;
if (uaccess_kernel()) {
set_cpu_flag(CIF_ASCE_SECONDARY);
__ctl_load(S390_lowcore.kernel_asce, 7, 7);
} else {
clear_cpu_flag(CIF_ASCE_SECONDARY);
__ctl_load(S390_lowcore.user_asce, 7, 7);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Heiko Carstens | 58 | 96.67% | 1 | 50.00% |
| Al Viro | 2 | 3.33% | 1 | 50.00% |
| Total | 60 | 100.00% | 2 | 100.00% |
static inline int __range_ok(unsigned long addr, unsigned long size)
{
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Heiko Carstens | 18 | 100.00% | 1 | 100.00% |
| Total | 18 | 100.00% | 1 | 100.00% |
#define __access_ok(addr, size) \
({ \
__chk_user_ptr(addr); \
__range_ok((unsigned long)(addr), (size)); \
})
#define access_ok(type, addr, size) __access_ok(addr, size)
unsigned long __must_check
raw_copy_from_user(void *to, const void __user *from, unsigned long n);
unsigned long __must_check
raw_copy_to_user(void __user *to, const void *from, unsigned long n);
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
#define __put_get_user_asm(to, from, size, spec) \
({ \
register unsigned long __reg0 asm("0") = spec; \
int __rc; \
\
asm volatile( \
"0: mvcos %1,%3,%2\n" \
"1: xr %0,%0\n" \
"2:\n" \
".pushsection .fixup, \"ax\"\n" \
"3: lhi %0,%5\n" \
" jg 2b\n" \
".popsection\n" \
EX_TABLE(0b,3b) EX_TABLE(1b,3b) \
: "=d" (__rc), "+Q" (*(to)) \
: "d" (size), "Q" (*(from)), \
"d" (__reg0), "K" (-EFAULT) \
: "cc"); \
__rc; \
})
static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
{
unsigned long spec = 0x810000UL;
int rc;
switch (size) {
case 1:
rc = __put_get_user_asm((unsigned char __user *)ptr,
(unsigned char *)x,
size, spec);
break;
case 2:
rc = __put_get_user_asm((unsigned short __user *)ptr,
(unsigned short *)x,
size, spec);
break;
case 4:
rc = __put_get_user_asm((unsigned int __user *)ptr,
(unsigned int *)x,
size, spec);
break;
case 8:
rc = __put_get_user_asm((unsigned long __user *)ptr,
(unsigned long *)x,
size, spec);
break;
}
return rc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Heiko Carstens | 150 | 100.00% | 2 | 100.00% |
| Total | 150 | 100.00% | 2 | 100.00% |
static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
{
unsigned long spec = 0x81UL;
int rc;
switch (size) {
case 1:
rc = __put_get_user_asm((unsigned char *)x,
(unsigned char __user *)ptr,
size, spec);
break;
case 2:
rc = __put_get_user_asm((unsigned short *)x,
(unsigned short __user *)ptr,
size, spec);
break;
case 4:
rc = __put_get_user_asm((unsigned int *)x,
(unsigned int __user *)ptr,
size, spec);
break;
case 8:
rc = __put_get_user_asm((unsigned long *)x,
(unsigned long __user *)ptr,
size, spec);
break;
}
return rc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Heiko Carstens | 151 | 100.00% | 2 | 100.00% |
| Total | 151 | 100.00% | 2 | 100.00% |
#else /* CONFIG_HAVE_MARCH_Z10_FEATURES */
static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
{
size = raw_copy_to_user(ptr, x, size);
return size ? -EFAULT : 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Gerald Schaefer | 24 | 61.54% | 1 | 14.29% |
| Heiko Carstens | 9 | 23.08% | 3 | 42.86% |
| Linus Torvalds | 3 | 7.69% | 1 | 14.29% |
| Martin Schwidefsky | 2 | 5.13% | 1 | 14.29% |
| Al Viro | 1 | 2.56% | 1 | 14.29% |
| Total | 39 | 100.00% | 7 | 100.00% |
static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
{
size = raw_copy_from_user(x, ptr, size);
return size ? -EFAULT : 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Gerald Schaefer | 25 | 62.50% | 1 | 16.67% |
| Heiko Carstens | 9 | 22.50% | 3 | 50.00% |
| Martin Schwidefsky | 5 | 12.50% | 1 | 16.67% |
| Al Viro | 1 | 2.50% | 1 | 16.67% |
| Total | 40 | 100.00% | 6 | 100.00% |
#endif /* CONFIG_HAVE_MARCH_Z10_FEATURES */
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*/
#define __put_user(x, ptr) \
({ \
__typeof__(*(ptr)) __x = (x); \
int __pu_err = -EFAULT; \
__chk_user_ptr(ptr); \
switch (sizeof (*(ptr))) { \
case 1: \
case 2: \
case 4: \
case 8: \
__pu_err = __put_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
break; \
default: \
__put_user_bad(); \
break; \
} \
__builtin_expect(__pu_err, 0); \
})
#define put_user(x, ptr) \
({ \
might_fault(); \
__put_user(x, ptr); \
})
int __put_user_bad(void) __attribute__((noreturn));
#define __get_user(x, ptr) \
({ \
int __gu_err = -EFAULT; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: { \
unsigned char __x = 0; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 2: { \
unsigned short __x = 0; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 4: { \
unsigned int __x = 0; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 8: { \
unsigned long long __x = 0; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
default: \
__get_user_bad(); \
break; \
} \
__builtin_expect(__gu_err, 0); \
})
#define get_user(x, ptr) \
({ \
might_fault(); \
__get_user(x, ptr); \
})
int __get_user_bad(void) __attribute__((noreturn));
unsigned long __must_check
raw_copy_in_user(void __user *to, const void __user *from, unsigned long n);
/*
* Copy a null terminated string from userspace.
*/
long __strncpy_from_user(char *dst, const char __user *src, long count);
static inline long __must_check
strncpy_from_user(char *dst, const char __user *src, long count)
{
might_fault();
return __strncpy_from_user(dst, src, count);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 23 | 67.65% | 1 | 10.00% |
| Heiko Carstens | 6 | 17.65% | 5 | 50.00% |
| Andrew Morton | 2 | 5.88% | 2 | 20.00% |
| Martin Schwidefsky | 2 | 5.88% | 1 | 10.00% |
| Gerald Schaefer | 1 | 2.94% | 1 | 10.00% |
| Total | 34 | 100.00% | 10 | 100.00% |
unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
{
might_fault();
return __strnlen_user(src, n);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 15 | 51.72% | 1 | 11.11% |
| Heiko Carstens | 8 | 27.59% | 4 | 44.44% |
| Andrew Morton | 4 | 13.79% | 3 | 33.33% |
| Martin Schwidefsky | 2 | 6.90% | 1 | 11.11% |
| Total | 29 | 100.00% | 9 | 100.00% |
/*
* Zero Userspace
*/
unsigned long __must_check __clear_user(void __user *to, unsigned long size);
static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
{
might_fault();
return __clear_user(to, n);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 13 | 44.83% | 1 | 9.09% |
| Heiko Carstens | 10 | 34.48% | 6 | 54.55% |
| Linus Torvalds (pre-git) | 2 | 6.90% | 1 | 9.09% |
| Martin Schwidefsky | 2 | 6.90% | 1 | 9.09% |
| Gerald Schaefer | 1 | 3.45% | 1 | 9.09% |
| Andrew Morton | 1 | 3.45% | 1 | 9.09% |
| Total | 29 | 100.00% | 11 | 100.00% |
int copy_to_user_real(void __user *dest, void *src, unsigned long count);
void s390_kernel_write(void *dst, const void *src, size_t size);
#endif /* __S390_UACCESS_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Heiko Carstens | 534 | 62.02% | 15 | 44.12% |
| Linus Torvalds (pre-git) | 101 | 11.73% | 1 | 2.94% |
| Gerald Schaefer | 74 | 8.59% | 2 | 5.88% |
| Andrew Morton | 49 | 5.69% | 4 | 11.76% |
| Linus Torvalds | 39 | 4.53% | 2 | 5.88% |
| Martin Schwidefsky | 34 | 3.95% | 4 | 11.76% |
| David Howells | 18 | 2.09% | 1 | 2.94% |
| Al Viro | 11 | 1.28% | 4 | 11.76% |
| Greg Kroah-Hartman | 1 | 0.12% | 1 | 2.94% |
| Total | 861 | 100.00% | 34 | 100.00% |
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