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454ede3f14
Historically the uaccess code pre-initializes the result of get_user() (and now also __get_kernel_nofault()) to zero and uses the result as input parameter for inline assemblies. This is different to what most, if not all, other architectures are doing, which set the result to zero within the exception handler in case of a fault. Use the new extable mechanism and handle zeroing of the result within the exception handler in case of a fault. Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
394 lines
9.4 KiB
C
394 lines
9.4 KiB
C
/* 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 (likely(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 (likely(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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int __put_user_bad(void) __attribute__((noreturn));
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int __get_user_bad(void) __attribute__((noreturn));
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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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#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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#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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__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, \
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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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__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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__gu_err = __get_user_fn(&__x, ptr, \
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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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__gu_err = __get_user_fn(&__x, ptr, \
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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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__gu_err = __get_user_fn(&__x, ptr, \
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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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__gu_err = __get_user_fn(&__x, ptr, \
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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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int copy_to_user_real(void __user *dest, unsigned long src, unsigned long count);
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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; \
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\
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__gk_err = __get_kernel_asm(__x, (type *)(src), "lg"); \
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*((type *)(dst)) = (type)__x; \
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break; \
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}; \
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default: \
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__gk_err = __get_kernel_bad(); \
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break; \
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} \
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if (unlikely(__gk_err)) \
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goto err_label; \
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} while (0)
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#endif /* __S390_UACCESS_H */
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