394 lines
9.3 KiB
C
394 lines
9.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* S390 version
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* Copyright IBM Corp. 1999, 2000
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* Author(s): Hartmut Penner (hp@de.ibm.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "include/asm-i386/uaccess.h"
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*/
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#ifndef __S390_UACCESS_H
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#define __S390_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <asm/asm-extable.h>
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#include <asm/processor.h>
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#include <asm/ctl_reg.h>
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#include <asm/extable.h>
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#include <asm/facility.h>
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#include <asm-generic/access_ok.h>
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void debug_user_asce(int exit);
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unsigned long __must_check
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raw_copy_from_user(void *to, const void __user *from, unsigned long n);
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unsigned long __must_check
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raw_copy_to_user(void __user *to, const void *from, unsigned long n);
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#ifndef CONFIG_KASAN
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#define INLINE_COPY_FROM_USER
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#define INLINE_COPY_TO_USER
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#endif
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unsigned long __must_check
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_copy_from_user_key(void *to, const void __user *from, unsigned long n, unsigned long key);
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static __always_inline unsigned long __must_check
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copy_from_user_key(void *to, const void __user *from, unsigned long n, unsigned long key)
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{
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if (check_copy_size(to, n, false))
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n = _copy_from_user_key(to, from, n, key);
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return n;
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}
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unsigned long __must_check
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_copy_to_user_key(void __user *to, const void *from, unsigned long n, unsigned long key);
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static __always_inline unsigned long __must_check
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copy_to_user_key(void __user *to, const void *from, unsigned long n, unsigned long key)
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{
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if (check_copy_size(from, n, true))
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n = _copy_to_user_key(to, from, n, key);
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return n;
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}
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union oac {
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unsigned int val;
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struct {
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struct {
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unsigned short key : 4;
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unsigned short : 4;
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unsigned short as : 2;
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unsigned short : 4;
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unsigned short k : 1;
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unsigned short a : 1;
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} oac1;
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struct {
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unsigned short key : 4;
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unsigned short : 4;
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unsigned short as : 2;
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unsigned short : 4;
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unsigned short k : 1;
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unsigned short a : 1;
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} oac2;
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};
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};
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int __noreturn __put_user_bad(void);
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#define __put_user_asm(to, from, size) \
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({ \
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union oac __oac_spec = { \
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.oac1.as = PSW_BITS_AS_SECONDARY, \
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.oac1.a = 1, \
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}; \
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int __rc; \
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\
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asm volatile( \
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" lr 0,%[spec]\n" \
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"0: mvcos %[_to],%[_from],%[_size]\n" \
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"1: xr %[rc],%[rc]\n" \
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"2:\n" \
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EX_TABLE_UA_STORE(0b, 2b, %[rc]) \
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EX_TABLE_UA_STORE(1b, 2b, %[rc]) \
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: [rc] "=&d" (__rc), [_to] "+Q" (*(to)) \
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: [_size] "d" (size), [_from] "Q" (*(from)), \
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[spec] "d" (__oac_spec.val) \
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: "cc", "0"); \
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__rc; \
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})
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static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
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{
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int rc;
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switch (size) {
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case 1:
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rc = __put_user_asm((unsigned char __user *)ptr,
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(unsigned char *)x,
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size);
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break;
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case 2:
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rc = __put_user_asm((unsigned short __user *)ptr,
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(unsigned short *)x,
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size);
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break;
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case 4:
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rc = __put_user_asm((unsigned int __user *)ptr,
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(unsigned int *)x,
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size);
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break;
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case 8:
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rc = __put_user_asm((unsigned long __user *)ptr,
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(unsigned long *)x,
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size);
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break;
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default:
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__put_user_bad();
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break;
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}
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return rc;
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}
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int __noreturn __get_user_bad(void);
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#define __get_user_asm(to, from, size) \
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({ \
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union oac __oac_spec = { \
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.oac2.as = PSW_BITS_AS_SECONDARY, \
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.oac2.a = 1, \
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}; \
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int __rc; \
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\
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asm volatile( \
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" lr 0,%[spec]\n" \
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"0: mvcos 0(%[_to]),%[_from],%[_size]\n" \
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"1: xr %[rc],%[rc]\n" \
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"2:\n" \
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EX_TABLE_UA_LOAD_MEM(0b, 2b, %[rc], %[_to], %[_ksize]) \
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EX_TABLE_UA_LOAD_MEM(1b, 2b, %[rc], %[_to], %[_ksize]) \
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: [rc] "=&d" (__rc), "=Q" (*(to)) \
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: [_size] "d" (size), [_from] "Q" (*(from)), \
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[spec] "d" (__oac_spec.val), [_to] "a" (to), \
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[_ksize] "K" (size) \
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: "cc", "0"); \
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__rc; \
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})
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static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
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{
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int rc;
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switch (size) {
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case 1:
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rc = __get_user_asm((unsigned char *)x,
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(unsigned char __user *)ptr,
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size);
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break;
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case 2:
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rc = __get_user_asm((unsigned short *)x,
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(unsigned short __user *)ptr,
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size);
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break;
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case 4:
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rc = __get_user_asm((unsigned int *)x,
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(unsigned int __user *)ptr,
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size);
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break;
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case 8:
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rc = __get_user_asm((unsigned long *)x,
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(unsigned long __user *)ptr,
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size);
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break;
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default:
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__get_user_bad();
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break;
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}
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return rc;
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}
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/*
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* These are the main single-value transfer routines. They automatically
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* use the right size if we just have the right pointer type.
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*/
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#define __put_user(x, ptr) \
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({ \
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__typeof__(*(ptr)) __x = (x); \
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int __pu_err = -EFAULT; \
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\
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__chk_user_ptr(ptr); \
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switch (sizeof(*(ptr))) { \
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case 1: \
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case 2: \
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case 4: \
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case 8: \
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__pu_err = __put_user_fn(&__x, ptr, sizeof(*(ptr))); \
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break; \
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default: \
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__put_user_bad(); \
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break; \
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} \
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__builtin_expect(__pu_err, 0); \
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})
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#define put_user(x, ptr) \
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({ \
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might_fault(); \
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__put_user(x, ptr); \
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})
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#define __get_user(x, ptr) \
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({ \
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int __gu_err = -EFAULT; \
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\
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__chk_user_ptr(ptr); \
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switch (sizeof(*(ptr))) { \
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case 1: { \
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unsigned char __x; \
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\
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__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \
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(x) = *(__force __typeof__(*(ptr)) *)&__x; \
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break; \
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}; \
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case 2: { \
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unsigned short __x; \
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\
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__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \
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(x) = *(__force __typeof__(*(ptr)) *)&__x; \
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break; \
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}; \
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case 4: { \
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unsigned int __x; \
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\
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__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \
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(x) = *(__force __typeof__(*(ptr)) *)&__x; \
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break; \
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}; \
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case 8: { \
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unsigned long __x; \
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\
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__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr))); \
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(x) = *(__force __typeof__(*(ptr)) *)&__x; \
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break; \
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}; \
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default: \
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__get_user_bad(); \
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break; \
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} \
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__builtin_expect(__gu_err, 0); \
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})
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#define get_user(x, ptr) \
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({ \
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might_fault(); \
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__get_user(x, ptr); \
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})
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/*
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* Copy a null terminated string from userspace.
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*/
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long __must_check strncpy_from_user(char *dst, const char __user *src, long count);
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long __must_check strnlen_user(const char __user *src, long count);
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/*
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* Zero Userspace
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*/
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unsigned long __must_check __clear_user(void __user *to, unsigned long size);
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static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
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{
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might_fault();
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return __clear_user(to, n);
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}
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void *s390_kernel_write(void *dst, const void *src, size_t size);
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int __noreturn __put_kernel_bad(void);
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#define __put_kernel_asm(val, to, insn) \
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({ \
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int __rc; \
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\
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asm volatile( \
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"0: " insn " %[_val],%[_to]\n" \
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"1: xr %[rc],%[rc]\n" \
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"2:\n" \
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EX_TABLE_UA_STORE(0b, 2b, %[rc]) \
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EX_TABLE_UA_STORE(1b, 2b, %[rc]) \
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: [rc] "=d" (__rc), [_to] "+Q" (*(to)) \
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: [_val] "d" (val) \
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: "cc"); \
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__rc; \
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})
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#define __put_kernel_nofault(dst, src, type, err_label) \
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do { \
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unsigned long __x = (unsigned long)(*((type *)(src))); \
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int __pk_err; \
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\
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switch (sizeof(type)) { \
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case 1: \
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__pk_err = __put_kernel_asm(__x, (type *)(dst), "stc"); \
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break; \
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case 2: \
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__pk_err = __put_kernel_asm(__x, (type *)(dst), "sth"); \
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break; \
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case 4: \
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__pk_err = __put_kernel_asm(__x, (type *)(dst), "st"); \
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break; \
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case 8: \
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__pk_err = __put_kernel_asm(__x, (type *)(dst), "stg"); \
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break; \
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default: \
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__pk_err = __put_kernel_bad(); \
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break; \
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} \
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if (unlikely(__pk_err)) \
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goto err_label; \
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} while (0)
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int __noreturn __get_kernel_bad(void);
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#define __get_kernel_asm(val, from, insn) \
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({ \
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int __rc; \
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\
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asm volatile( \
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"0: " insn " %[_val],%[_from]\n" \
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"1: xr %[rc],%[rc]\n" \
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"2:\n" \
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EX_TABLE_UA_LOAD_REG(0b, 2b, %[rc], %[_val]) \
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EX_TABLE_UA_LOAD_REG(1b, 2b, %[rc], %[_val]) \
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: [rc] "=d" (__rc), [_val] "=d" (val) \
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: [_from] "Q" (*(from)) \
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: "cc"); \
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__rc; \
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})
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#define __get_kernel_nofault(dst, src, type, err_label) \
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do { \
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int __gk_err; \
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\
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switch (sizeof(type)) { \
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case 1: { \
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unsigned char __x; \
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\
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__gk_err = __get_kernel_asm(__x, (type *)(src), "ic"); \
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*((type *)(dst)) = (type)__x; \
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break; \
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}; \
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case 2: { \
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unsigned short __x; \
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\
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__gk_err = __get_kernel_asm(__x, (type *)(src), "lh"); \
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*((type *)(dst)) = (type)__x; \
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break; \
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}; \
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case 4: { \
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unsigned int __x; \
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\
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__gk_err = __get_kernel_asm(__x, (type *)(src), "l"); \
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*((type *)(dst)) = (type)__x; \
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break; \
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}; \
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case 8: { \
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unsigned long __x; \
|
||
|
|
\
|
||
|
|
__gk_err = __get_kernel_asm(__x, (type *)(src), "lg"); \
|
||
|
|
*((type *)(dst)) = (type)__x; \
|
||
|
|
break; \
|
||
|
|
}; \
|
||
|
|
default: \
|
||
|
|
__gk_err = __get_kernel_bad(); \
|
||
|
|
break; \
|
||
|
|
} \
|
||
|
|
if (unlikely(__gk_err)) \
|
||
|
|
goto err_label; \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#endif /* __S390_UACCESS_H */
|