602 lines
15 KiB
C
602 lines
15 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)
|
||
|
|
|
||
|
|
void __cmpxchg_user_key_called_with_bad_pointer(void);
|
||
|
|
|
||
|
|
#define CMPXCHG_USER_KEY_MAX_LOOPS 128
|
||
|
|
|
||
|
|
static __always_inline int __cmpxchg_user_key(unsigned long address, void *uval,
|
||
|
|
__uint128_t old, __uint128_t new,
|
||
|
|
unsigned long key, int size)
|
||
|
|
{
|
||
|
|
int rc = 0;
|
||
|
|
|
||
|
|
switch (size) {
|
||
|
|
case 1: {
|
||
|
|
unsigned int prev, shift, mask, _old, _new;
|
||
|
|
unsigned long count;
|
||
|
|
|
||
|
|
shift = (3 ^ (address & 3)) << 3;
|
||
|
|
address ^= address & 3;
|
||
|
|
_old = ((unsigned int)old & 0xff) << shift;
|
||
|
|
_new = ((unsigned int)new & 0xff) << shift;
|
||
|
|
mask = ~(0xff << shift);
|
||
|
|
asm volatile(
|
||
|
|
" spka 0(%[key])\n"
|
||
|
|
" sacf 256\n"
|
||
|
|
" llill %[count],%[max_loops]\n"
|
||
|
|
"0: l %[prev],%[address]\n"
|
||
|
|
"1: nr %[prev],%[mask]\n"
|
||
|
|
" xilf %[mask],0xffffffff\n"
|
||
|
|
" or %[new],%[prev]\n"
|
||
|
|
" or %[prev],%[tmp]\n"
|
||
|
|
"2: lr %[tmp],%[prev]\n"
|
||
|
|
"3: cs %[prev],%[new],%[address]\n"
|
||
|
|
"4: jnl 5f\n"
|
||
|
|
" xr %[tmp],%[prev]\n"
|
||
|
|
" xr %[new],%[tmp]\n"
|
||
|
|
" nr %[tmp],%[mask]\n"
|
||
|
|
" jnz 5f\n"
|
||
|
|
" brct %[count],2b\n"
|
||
|
|
"5: sacf 768\n"
|
||
|
|
" spka %[default_key]\n"
|
||
|
|
EX_TABLE_UA_LOAD_REG(0b, 5b, %[rc], %[prev])
|
||
|
|
EX_TABLE_UA_LOAD_REG(1b, 5b, %[rc], %[prev])
|
||
|
|
EX_TABLE_UA_LOAD_REG(3b, 5b, %[rc], %[prev])
|
||
|
|
EX_TABLE_UA_LOAD_REG(4b, 5b, %[rc], %[prev])
|
||
|
|
: [rc] "+&d" (rc),
|
||
|
|
[prev] "=&d" (prev),
|
||
|
|
[address] "+Q" (*(int *)address),
|
||
|
|
[tmp] "+&d" (_old),
|
||
|
|
[new] "+&d" (_new),
|
||
|
|
[mask] "+&d" (mask),
|
||
|
|
[count] "=a" (count)
|
||
|
|
: [key] "%[count]" (key << 4),
|
||
|
|
[default_key] "J" (PAGE_DEFAULT_KEY),
|
||
|
|
[max_loops] "J" (CMPXCHG_USER_KEY_MAX_LOOPS)
|
||
|
|
: "memory", "cc");
|
||
|
|
*(unsigned char *)uval = prev >> shift;
|
||
|
|
if (!count)
|
||
|
|
rc = -EAGAIN;
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
case 2: {
|
||
|
|
unsigned int prev, shift, mask, _old, _new;
|
||
|
|
unsigned long count;
|
||
|
|
|
||
|
|
shift = (2 ^ (address & 2)) << 3;
|
||
|
|
address ^= address & 2;
|
||
|
|
_old = ((unsigned int)old & 0xffff) << shift;
|
||
|
|
_new = ((unsigned int)new & 0xffff) << shift;
|
||
|
|
mask = ~(0xffff << shift);
|
||
|
|
asm volatile(
|
||
|
|
" spka 0(%[key])\n"
|
||
|
|
" sacf 256\n"
|
||
|
|
" llill %[count],%[max_loops]\n"
|
||
|
|
"0: l %[prev],%[address]\n"
|
||
|
|
"1: nr %[prev],%[mask]\n"
|
||
|
|
" xilf %[mask],0xffffffff\n"
|
||
|
|
" or %[new],%[prev]\n"
|
||
|
|
" or %[prev],%[tmp]\n"
|
||
|
|
"2: lr %[tmp],%[prev]\n"
|
||
|
|
"3: cs %[prev],%[new],%[address]\n"
|
||
|
|
"4: jnl 5f\n"
|
||
|
|
" xr %[tmp],%[prev]\n"
|
||
|
|
" xr %[new],%[tmp]\n"
|
||
|
|
" nr %[tmp],%[mask]\n"
|
||
|
|
" jnz 5f\n"
|
||
|
|
" brct %[count],2b\n"
|
||
|
|
"5: sacf 768\n"
|
||
|
|
" spka %[default_key]\n"
|
||
|
|
EX_TABLE_UA_LOAD_REG(0b, 5b, %[rc], %[prev])
|
||
|
|
EX_TABLE_UA_LOAD_REG(1b, 5b, %[rc], %[prev])
|
||
|
|
EX_TABLE_UA_LOAD_REG(3b, 5b, %[rc], %[prev])
|
||
|
|
EX_TABLE_UA_LOAD_REG(4b, 5b, %[rc], %[prev])
|
||
|
|
: [rc] "+&d" (rc),
|
||
|
|
[prev] "=&d" (prev),
|
||
|
|
[address] "+Q" (*(int *)address),
|
||
|
|
[tmp] "+&d" (_old),
|
||
|
|
[new] "+&d" (_new),
|
||
|
|
[mask] "+&d" (mask),
|
||
|
|
[count] "=a" (count)
|
||
|
|
: [key] "%[count]" (key << 4),
|
||
|
|
[default_key] "J" (PAGE_DEFAULT_KEY),
|
||
|
|
[max_loops] "J" (CMPXCHG_USER_KEY_MAX_LOOPS)
|
||
|
|
: "memory", "cc");
|
||
|
|
*(unsigned short *)uval = prev >> shift;
|
||
|
|
if (!count)
|
||
|
|
rc = -EAGAIN;
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
case 4: {
|
||
|
|
unsigned int prev = old;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
" spka 0(%[key])\n"
|
||
|
|
" sacf 256\n"
|
||
|
|
"0: cs %[prev],%[new],%[address]\n"
|
||
|
|
"1: sacf 768\n"
|
||
|
|
" spka %[default_key]\n"
|
||
|
|
EX_TABLE_UA_LOAD_REG(0b, 1b, %[rc], %[prev])
|
||
|
|
EX_TABLE_UA_LOAD_REG(1b, 1b, %[rc], %[prev])
|
||
|
|
: [rc] "+&d" (rc),
|
||
|
|
[prev] "+&d" (prev),
|
||
|
|
[address] "+Q" (*(int *)address)
|
||
|
|
: [new] "d" ((unsigned int)new),
|
||
|
|
[key] "a" (key << 4),
|
||
|
|
[default_key] "J" (PAGE_DEFAULT_KEY)
|
||
|
|
: "memory", "cc");
|
||
|
|
*(unsigned int *)uval = prev;
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
case 8: {
|
||
|
|
unsigned long prev = old;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
" spka 0(%[key])\n"
|
||
|
|
" sacf 256\n"
|
||
|
|
"0: csg %[prev],%[new],%[address]\n"
|
||
|
|
"1: sacf 768\n"
|
||
|
|
" spka %[default_key]\n"
|
||
|
|
EX_TABLE_UA_LOAD_REG(0b, 1b, %[rc], %[prev])
|
||
|
|
EX_TABLE_UA_LOAD_REG(1b, 1b, %[rc], %[prev])
|
||
|
|
: [rc] "+&d" (rc),
|
||
|
|
[prev] "+&d" (prev),
|
||
|
|
[address] "+QS" (*(long *)address)
|
||
|
|
: [new] "d" ((unsigned long)new),
|
||
|
|
[key] "a" (key << 4),
|
||
|
|
[default_key] "J" (PAGE_DEFAULT_KEY)
|
||
|
|
: "memory", "cc");
|
||
|
|
*(unsigned long *)uval = prev;
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
case 16: {
|
||
|
|
__uint128_t prev = old;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
" spka 0(%[key])\n"
|
||
|
|
" sacf 256\n"
|
||
|
|
"0: cdsg %[prev],%[new],%[address]\n"
|
||
|
|
"1: sacf 768\n"
|
||
|
|
" spka %[default_key]\n"
|
||
|
|
EX_TABLE_UA_LOAD_REGPAIR(0b, 1b, %[rc], %[prev])
|
||
|
|
EX_TABLE_UA_LOAD_REGPAIR(1b, 1b, %[rc], %[prev])
|
||
|
|
: [rc] "+&d" (rc),
|
||
|
|
[prev] "+&d" (prev),
|
||
|
|
[address] "+QS" (*(__int128_t *)address)
|
||
|
|
: [new] "d" (new),
|
||
|
|
[key] "a" (key << 4),
|
||
|
|
[default_key] "J" (PAGE_DEFAULT_KEY)
|
||
|
|
: "memory", "cc");
|
||
|
|
*(__uint128_t *)uval = prev;
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
__cmpxchg_user_key_called_with_bad_pointer();
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cmpxchg_user_key() - cmpxchg with user space target, honoring storage keys
|
||
|
|
* @ptr: User space address of value to compare to @old and exchange with
|
||
|
|
* @new. Must be aligned to sizeof(*@ptr).
|
||
|
|
* @uval: Address where the old value of *@ptr is written to.
|
||
|
|
* @old: Old value. Compared to the content pointed to by @ptr in order to
|
||
|
|
* determine if the exchange occurs. The old value read from *@ptr is
|
||
|
|
* written to *@uval.
|
||
|
|
* @new: New value to place at *@ptr.
|
||
|
|
* @key: Access key to use for checking storage key protection.
|
||
|
|
*
|
||
|
|
* Perform a cmpxchg on a user space target, honoring storage key protection.
|
||
|
|
* @key alone determines how key checking is performed, neither
|
||
|
|
* storage-protection-override nor fetch-protection-override apply.
|
||
|
|
* The caller must compare *@uval and @old to determine if values have been
|
||
|
|
* exchanged. In case of an exception *@uval is set to zero.
|
||
|
|
*
|
||
|
|
* Return: 0: cmpxchg executed
|
||
|
|
* -EFAULT: an exception happened when trying to access *@ptr
|
||
|
|
* -EAGAIN: maxed out number of retries (byte and short only)
|
||
|
|
*/
|
||
|
|
#define cmpxchg_user_key(ptr, uval, old, new, key) \
|
||
|
|
({ \
|
||
|
|
__typeof__(ptr) __ptr = (ptr); \
|
||
|
|
__typeof__(uval) __uval = (uval); \
|
||
|
|
\
|
||
|
|
BUILD_BUG_ON(sizeof(*(__ptr)) != sizeof(*(__uval))); \
|
||
|
|
might_fault(); \
|
||
|
|
__chk_user_ptr(__ptr); \
|
||
|
|
__cmpxchg_user_key((unsigned long)(__ptr), (void *)(__uval), \
|
||
|
|
(old), (new), (key), sizeof(*(__ptr))); \
|
||
|
|
})
|
||
|
|
|
||
|
|
#endif /* __S390_UACCESS_H */
|