403 lines
14 KiB
C
403 lines
14 KiB
C
#ifndef _ASM_IA64_UACCESS_H
|
|
#define _ASM_IA64_UACCESS_H
|
|
|
|
/*
|
|
* This file defines various macros to transfer memory areas across
|
|
* the user/kernel boundary. This needs to be done carefully because
|
|
* this code is executed in kernel mode and uses user-specified
|
|
* addresses. Thus, we need to be careful not to let the user to
|
|
* trick us into accessing kernel memory that would normally be
|
|
* inaccessible. This code is also fairly performance sensitive,
|
|
* so we want to spend as little time doing safety checks as
|
|
* possible.
|
|
*
|
|
* To make matters a bit more interesting, these macros sometimes also
|
|
* called from within the kernel itself, in which case the address
|
|
* validity check must be skipped. The get_fs() macro tells us what
|
|
* to do: if get_fs()==USER_DS, checking is performed, if
|
|
* get_fs()==KERNEL_DS, checking is bypassed.
|
|
*
|
|
* Note that even if the memory area specified by the user is in a
|
|
* valid address range, it is still possible that we'll get a page
|
|
* fault while accessing it. This is handled by filling out an
|
|
* exception handler fixup entry for each instruction that has the
|
|
* potential to fault. When such a fault occurs, the page fault
|
|
* handler checks to see whether the faulting instruction has a fixup
|
|
* associated and, if so, sets r8 to -EFAULT and clears r9 to 0 and
|
|
* then resumes execution at the continuation point.
|
|
*
|
|
* Based on <asm-alpha/uaccess.h>.
|
|
*
|
|
* Copyright (C) 1998, 1999, 2001-2004 Hewlett-Packard Co
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>
|
|
*/
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/page-flags.h>
|
|
#include <linux/mm.h>
|
|
|
|
#include <asm/intrinsics.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/io.h>
|
|
|
|
/*
|
|
* For historical reasons, the following macros are grossly misnamed:
|
|
*/
|
|
#define KERNEL_DS ((mm_segment_t) { ~0UL }) /* cf. access_ok() */
|
|
#define USER_DS ((mm_segment_t) { TASK_SIZE-1 }) /* cf. access_ok() */
|
|
|
|
#define VERIFY_READ 0
|
|
#define VERIFY_WRITE 1
|
|
|
|
#define get_ds() (KERNEL_DS)
|
|
#define get_fs() (current_thread_info()->addr_limit)
|
|
#define set_fs(x) (current_thread_info()->addr_limit = (x))
|
|
|
|
#define segment_eq(a, b) ((a).seg == (b).seg)
|
|
|
|
/*
|
|
* When accessing user memory, we need to make sure the entire area really is in
|
|
* user-level space. In order to do this efficiently, we make sure that the page at
|
|
* address TASK_SIZE is never valid. We also need to make sure that the address doesn't
|
|
* point inside the virtually mapped linear page table.
|
|
*/
|
|
#define __access_ok(addr, size, segment) \
|
|
({ \
|
|
__chk_user_ptr(addr); \
|
|
(likely((unsigned long) (addr) <= (segment).seg) \
|
|
&& ((segment).seg == KERNEL_DS.seg \
|
|
|| likely(REGION_OFFSET((unsigned long) (addr)) < RGN_MAP_LIMIT))); \
|
|
})
|
|
#define access_ok(type, addr, size) __access_ok((addr), (size), get_fs())
|
|
|
|
/*
|
|
* These are the main single-value transfer routines. They automatically
|
|
* use the right size if we just have the right pointer type.
|
|
*
|
|
* Careful to not
|
|
* (a) re-use the arguments for side effects (sizeof/typeof is ok)
|
|
* (b) require any knowledge of processes at this stage
|
|
*/
|
|
#define put_user(x, ptr) __put_user_check((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)), get_fs())
|
|
#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)), get_fs())
|
|
|
|
/*
|
|
* The "__xxx" versions do not do address space checking, useful when
|
|
* doing multiple accesses to the same area (the programmer has to do the
|
|
* checks by hand with "access_ok()")
|
|
*/
|
|
#define __put_user(x, ptr) __put_user_nocheck((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)))
|
|
#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
|
|
|
|
extern long __put_user_unaligned_unknown (void);
|
|
|
|
#define __put_user_unaligned(x, ptr) \
|
|
({ \
|
|
long __ret; \
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: __ret = __put_user((x), (ptr)); break; \
|
|
case 2: __ret = (__put_user((x), (u8 __user *)(ptr))) \
|
|
| (__put_user((x) >> 8, ((u8 __user *)(ptr) + 1))); break; \
|
|
case 4: __ret = (__put_user((x), (u16 __user *)(ptr))) \
|
|
| (__put_user((x) >> 16, ((u16 __user *)(ptr) + 1))); break; \
|
|
case 8: __ret = (__put_user((x), (u32 __user *)(ptr))) \
|
|
| (__put_user((x) >> 32, ((u32 __user *)(ptr) + 1))); break; \
|
|
default: __ret = __put_user_unaligned_unknown(); \
|
|
} \
|
|
__ret; \
|
|
})
|
|
|
|
extern long __get_user_unaligned_unknown (void);
|
|
|
|
#define __get_user_unaligned(x, ptr) \
|
|
({ \
|
|
long __ret; \
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: __ret = __get_user((x), (ptr)); break; \
|
|
case 2: __ret = (__get_user((x), (u8 __user *)(ptr))) \
|
|
| (__get_user((x) >> 8, ((u8 __user *)(ptr) + 1))); break; \
|
|
case 4: __ret = (__get_user((x), (u16 __user *)(ptr))) \
|
|
| (__get_user((x) >> 16, ((u16 __user *)(ptr) + 1))); break; \
|
|
case 8: __ret = (__get_user((x), (u32 __user *)(ptr))) \
|
|
| (__get_user((x) >> 32, ((u32 __user *)(ptr) + 1))); break; \
|
|
default: __ret = __get_user_unaligned_unknown(); \
|
|
} \
|
|
__ret; \
|
|
})
|
|
|
|
#ifdef ASM_SUPPORTED
|
|
struct __large_struct { unsigned long buf[100]; };
|
|
# define __m(x) (*(struct __large_struct __user *)(x))
|
|
|
|
/* We need to declare the __ex_table section before we can use it in .xdata. */
|
|
asm (".section \"__ex_table\", \"a\"\n\t.previous");
|
|
|
|
# define __get_user_size(val, addr, n, err) \
|
|
do { \
|
|
register long __gu_r8 asm ("r8") = 0; \
|
|
register long __gu_r9 asm ("r9"); \
|
|
asm ("\n[1:]\tld"#n" %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n" \
|
|
"\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \
|
|
"[1:]" \
|
|
: "=r"(__gu_r9), "=r"(__gu_r8) : "m"(__m(addr)), "1"(__gu_r8)); \
|
|
(err) = __gu_r8; \
|
|
(val) = __gu_r9; \
|
|
} while (0)
|
|
|
|
/*
|
|
* The "__put_user_size()" macro tells gcc it reads from memory instead of writing it. This
|
|
* is because they do not write to any memory gcc knows about, so there are no aliasing
|
|
* issues.
|
|
*/
|
|
# define __put_user_size(val, addr, n, err) \
|
|
do { \
|
|
register long __pu_r8 asm ("r8") = 0; \
|
|
asm volatile ("\n[1:]\tst"#n" %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \
|
|
"\t.xdata4 \"__ex_table\", 1b-., 1f-.\n" \
|
|
"[1:]" \
|
|
: "=r"(__pu_r8) : "m"(__m(addr)), "rO"(val), "0"(__pu_r8)); \
|
|
(err) = __pu_r8; \
|
|
} while (0)
|
|
|
|
#else /* !ASM_SUPPORTED */
|
|
# define RELOC_TYPE 2 /* ip-rel */
|
|
# define __get_user_size(val, addr, n, err) \
|
|
do { \
|
|
__ld_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE); \
|
|
(err) = ia64_getreg(_IA64_REG_R8); \
|
|
(val) = ia64_getreg(_IA64_REG_R9); \
|
|
} while (0)
|
|
# define __put_user_size(val, addr, n, err) \
|
|
do { \
|
|
__st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE, \
|
|
(__force unsigned long) (val)); \
|
|
(err) = ia64_getreg(_IA64_REG_R8); \
|
|
} while (0)
|
|
#endif /* !ASM_SUPPORTED */
|
|
|
|
extern void __get_user_unknown (void);
|
|
|
|
/*
|
|
* Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
|
|
* could clobber r8 and r9 (among others). Thus, be careful not to evaluate it while
|
|
* using r8/r9.
|
|
*/
|
|
#define __do_get_user(check, x, ptr, size, segment) \
|
|
({ \
|
|
const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
|
|
__typeof__ (size) __gu_size = (size); \
|
|
long __gu_err = -EFAULT; \
|
|
unsigned long __gu_val = 0; \
|
|
if (!check || __access_ok(__gu_ptr, size, segment)) \
|
|
switch (__gu_size) { \
|
|
case 1: __get_user_size(__gu_val, __gu_ptr, 1, __gu_err); break; \
|
|
case 2: __get_user_size(__gu_val, __gu_ptr, 2, __gu_err); break; \
|
|
case 4: __get_user_size(__gu_val, __gu_ptr, 4, __gu_err); break; \
|
|
case 8: __get_user_size(__gu_val, __gu_ptr, 8, __gu_err); break; \
|
|
default: __get_user_unknown(); break; \
|
|
} \
|
|
(x) = (__force __typeof__(*(__gu_ptr))) __gu_val; \
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_user_nocheck(x, ptr, size) __do_get_user(0, x, ptr, size, KERNEL_DS)
|
|
#define __get_user_check(x, ptr, size, segment) __do_get_user(1, x, ptr, size, segment)
|
|
|
|
extern void __put_user_unknown (void);
|
|
|
|
/*
|
|
* Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
|
|
* could clobber r8 (among others). Thus, be careful not to evaluate them while using r8.
|
|
*/
|
|
#define __do_put_user(check, x, ptr, size, segment) \
|
|
({ \
|
|
__typeof__ (x) __pu_x = (x); \
|
|
__typeof__ (*(ptr)) __user *__pu_ptr = (ptr); \
|
|
__typeof__ (size) __pu_size = (size); \
|
|
long __pu_err = -EFAULT; \
|
|
\
|
|
if (!check || __access_ok(__pu_ptr, __pu_size, segment)) \
|
|
switch (__pu_size) { \
|
|
case 1: __put_user_size(__pu_x, __pu_ptr, 1, __pu_err); break; \
|
|
case 2: __put_user_size(__pu_x, __pu_ptr, 2, __pu_err); break; \
|
|
case 4: __put_user_size(__pu_x, __pu_ptr, 4, __pu_err); break; \
|
|
case 8: __put_user_size(__pu_x, __pu_ptr, 8, __pu_err); break; \
|
|
default: __put_user_unknown(); break; \
|
|
} \
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_user_nocheck(x, ptr, size) __do_put_user(0, x, ptr, size, KERNEL_DS)
|
|
#define __put_user_check(x, ptr, size, segment) __do_put_user(1, x, ptr, size, segment)
|
|
|
|
/*
|
|
* Complex access routines
|
|
*/
|
|
extern unsigned long __must_check __copy_user (void __user *to, const void __user *from,
|
|
unsigned long count);
|
|
|
|
static inline unsigned long
|
|
__copy_to_user (void __user *to, const void *from, unsigned long count)
|
|
{
|
|
return __copy_user(to, (__force void __user *) from, count);
|
|
}
|
|
|
|
static inline unsigned long
|
|
__copy_from_user (void *to, const void __user *from, unsigned long count)
|
|
{
|
|
return __copy_user((__force void __user *) to, from, count);
|
|
}
|
|
|
|
#define __copy_to_user_inatomic __copy_to_user
|
|
#define __copy_from_user_inatomic __copy_from_user
|
|
#define copy_to_user(to, from, n) \
|
|
({ \
|
|
void __user *__cu_to = (to); \
|
|
const void *__cu_from = (from); \
|
|
long __cu_len = (n); \
|
|
\
|
|
if (__access_ok(__cu_to, __cu_len, get_fs())) \
|
|
__cu_len = __copy_user(__cu_to, (__force void __user *) __cu_from, __cu_len); \
|
|
__cu_len; \
|
|
})
|
|
|
|
#define copy_from_user(to, from, n) \
|
|
({ \
|
|
void *__cu_to = (to); \
|
|
const void __user *__cu_from = (from); \
|
|
long __cu_len = (n); \
|
|
\
|
|
__chk_user_ptr(__cu_from); \
|
|
if (__access_ok(__cu_from, __cu_len, get_fs())) \
|
|
__cu_len = __copy_user((__force void __user *) __cu_to, __cu_from, __cu_len); \
|
|
__cu_len; \
|
|
})
|
|
|
|
#define __copy_in_user(to, from, size) __copy_user((to), (from), (size))
|
|
|
|
static inline unsigned long
|
|
copy_in_user (void __user *to, const void __user *from, unsigned long n)
|
|
{
|
|
if (likely(access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n)))
|
|
n = __copy_user(to, from, n);
|
|
return n;
|
|
}
|
|
|
|
extern unsigned long __do_clear_user (void __user *, unsigned long);
|
|
|
|
#define __clear_user(to, n) __do_clear_user(to, n)
|
|
|
|
#define clear_user(to, n) \
|
|
({ \
|
|
unsigned long __cu_len = (n); \
|
|
if (__access_ok(to, __cu_len, get_fs())) \
|
|
__cu_len = __do_clear_user(to, __cu_len); \
|
|
__cu_len; \
|
|
})
|
|
|
|
|
|
/*
|
|
* Returns: -EFAULT if exception before terminator, N if the entire buffer filled, else
|
|
* strlen.
|
|
*/
|
|
extern long __must_check __strncpy_from_user (char *to, const char __user *from, long to_len);
|
|
|
|
#define strncpy_from_user(to, from, n) \
|
|
({ \
|
|
const char __user * __sfu_from = (from); \
|
|
long __sfu_ret = -EFAULT; \
|
|
if (__access_ok(__sfu_from, 0, get_fs())) \
|
|
__sfu_ret = __strncpy_from_user((to), __sfu_from, (n)); \
|
|
__sfu_ret; \
|
|
})
|
|
|
|
/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
|
|
extern unsigned long __strlen_user (const char __user *);
|
|
|
|
#define strlen_user(str) \
|
|
({ \
|
|
const char __user *__su_str = (str); \
|
|
unsigned long __su_ret = 0; \
|
|
if (__access_ok(__su_str, 0, get_fs())) \
|
|
__su_ret = __strlen_user(__su_str); \
|
|
__su_ret; \
|
|
})
|
|
|
|
/*
|
|
* Returns: 0 if exception before NUL or reaching the supplied limit
|
|
* (N), a value greater than N if the limit would be exceeded, else
|
|
* strlen.
|
|
*/
|
|
extern unsigned long __strnlen_user (const char __user *, long);
|
|
|
|
#define strnlen_user(str, len) \
|
|
({ \
|
|
const char __user *__su_str = (str); \
|
|
unsigned long __su_ret = 0; \
|
|
if (__access_ok(__su_str, 0, get_fs())) \
|
|
__su_ret = __strnlen_user(__su_str, len); \
|
|
__su_ret; \
|
|
})
|
|
|
|
/* Generic code can't deal with the location-relative format that we use for compactness. */
|
|
#define ARCH_HAS_SORT_EXTABLE
|
|
#define ARCH_HAS_SEARCH_EXTABLE
|
|
|
|
struct exception_table_entry {
|
|
int addr; /* location-relative address of insn this fixup is for */
|
|
int cont; /* location-relative continuation addr.; if bit 2 is set, r9 is set to 0 */
|
|
};
|
|
|
|
extern void ia64_handle_exception (struct pt_regs *regs, const struct exception_table_entry *e);
|
|
extern const struct exception_table_entry *search_exception_tables (unsigned long addr);
|
|
|
|
static inline int
|
|
ia64_done_with_exception (struct pt_regs *regs)
|
|
{
|
|
const struct exception_table_entry *e;
|
|
e = search_exception_tables(regs->cr_iip + ia64_psr(regs)->ri);
|
|
if (e) {
|
|
ia64_handle_exception(regs, e);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define ARCH_HAS_TRANSLATE_MEM_PTR 1
|
|
static __inline__ void *
|
|
xlate_dev_mem_ptr(phys_addr_t p)
|
|
{
|
|
struct page *page;
|
|
void *ptr;
|
|
|
|
page = pfn_to_page(p >> PAGE_SHIFT);
|
|
if (PageUncached(page))
|
|
ptr = (void *)p + __IA64_UNCACHED_OFFSET;
|
|
else
|
|
ptr = __va(p);
|
|
|
|
return ptr;
|
|
}
|
|
|
|
/*
|
|
* Convert a virtual cached kernel memory pointer to an uncached pointer
|
|
*/
|
|
static __inline__ void *
|
|
xlate_dev_kmem_ptr(void *p)
|
|
{
|
|
struct page *page;
|
|
void *ptr;
|
|
|
|
page = virt_to_page((unsigned long)p);
|
|
if (PageUncached(page))
|
|
ptr = (void *)__pa(p) + __IA64_UNCACHED_OFFSET;
|
|
else
|
|
ptr = p;
|
|
|
|
return ptr;
|
|
}
|
|
|
|
#endif /* _ASM_IA64_UACCESS_H */
|