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Kbuild
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mmu.h
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pci_dma.h
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processor.h
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uaccess.h
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Editing: uaccess.h
Close
/* 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> #include <asm/facility.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 KERNEL_DS (0) #define KERNEL_DS_SACF (1) #define USER_DS (2) #define USER_DS_SACF (3) #define get_ds() (KERNEL_DS) #define get_fs() (current->thread.mm_segment) #define segment_eq(a,b) (((a) & 2) == ((b) & 2)) void set_fs(mm_segment_t fs); static inline int __range_ok(unsigned long addr, unsigned long size) { return 1; } #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); #ifndef CONFIG_KASAN #define INLINE_COPY_FROM_USER #define INLINE_COPY_TO_USER #endif #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 __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned long size) { unsigned long spec = 0x010000UL; 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; } static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size) { unsigned long spec = 0x01UL; 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; } #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; } 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; } #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); } 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); } /* * 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); } 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 */