888 lines
21 KiB
C
888 lines
21 KiB
C
#ifndef __M68K_UACCESS_H
|
|
#define __M68K_UACCESS_H
|
|
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/segment.h>
|
|
|
|
#define VERIFY_READ 0
|
|
#define VERIFY_WRITE 1
|
|
|
|
/* We let the MMU do all checking */
|
|
#define access_ok(type,addr,size) 1
|
|
|
|
/*
|
|
* The exception table consists of pairs of addresses: the first is the
|
|
* address of an instruction that is allowed to fault, and the second is
|
|
* the address at which the program should continue. No registers are
|
|
* modified, so it is entirely up to the continuation code to figure out
|
|
* what to do.
|
|
*
|
|
* All the routines below use bits of fixup code that are out of line
|
|
* with the main instruction path. This means when everything is well,
|
|
* we don't even have to jump over them. Further, they do not intrude
|
|
* on our cache or tlb entries.
|
|
*/
|
|
|
|
struct exception_table_entry
|
|
{
|
|
unsigned long insn, fixup;
|
|
};
|
|
|
|
|
|
/*
|
|
* These are the main single-value transfer routines. They automatically
|
|
* use the right size if we just have the right pointer type.
|
|
*/
|
|
|
|
#define put_user(x, ptr) \
|
|
({ \
|
|
int __pu_err; \
|
|
typeof(*(ptr)) __pu_val = (x); \
|
|
switch (sizeof (*(ptr))) { \
|
|
case 1: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, b); \
|
|
break; \
|
|
case 2: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, w); \
|
|
break; \
|
|
case 4: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, l); \
|
|
break; \
|
|
case 8: \
|
|
__pu_err = __constant_copy_to_user(ptr, &__pu_val, 8); \
|
|
break; \
|
|
default: \
|
|
__pu_err = __put_user_bad(); \
|
|
break; \
|
|
} \
|
|
__pu_err; \
|
|
})
|
|
#define __put_user(x, ptr) put_user(x, ptr)
|
|
|
|
extern int __put_user_bad(void);
|
|
|
|
/*
|
|
* Tell gcc we read from memory instead of writing: this is because
|
|
* we do not write to any memory gcc knows about, so there are no
|
|
* aliasing issues.
|
|
*/
|
|
#define __put_user_asm(err,x,ptr,bwl) \
|
|
__asm__ __volatile__ \
|
|
("21:moves" #bwl " %2,%1\n" \
|
|
"1:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"2: movel %3,%0\n" \
|
|
" jra 1b\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 21b,2b\n" \
|
|
" .long 1b,2b\n" \
|
|
".previous" \
|
|
: "=d"(err) \
|
|
: "m"(*(ptr)), "r"(x), "i"(-EFAULT), "0"(0))
|
|
|
|
#define get_user(x, ptr) \
|
|
({ \
|
|
int __gu_err; \
|
|
typeof(*(ptr)) __gu_val; \
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, b, "=d"); \
|
|
break; \
|
|
case 2: \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, w, "=r"); \
|
|
break; \
|
|
case 4: \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, l, "=r"); \
|
|
break; \
|
|
case 8: \
|
|
__gu_err = __constant_copy_from_user(&__gu_val, ptr, 8); \
|
|
break; \
|
|
default: \
|
|
__gu_val = 0; \
|
|
__gu_err = __get_user_bad(); \
|
|
break; \
|
|
} \
|
|
(x) = __gu_val; \
|
|
__gu_err; \
|
|
})
|
|
#define __get_user(x, ptr) get_user(x, ptr)
|
|
|
|
extern int __get_user_bad(void);
|
|
|
|
#define __get_user_asm(err,x,ptr,bwl,reg) \
|
|
__asm__ __volatile__ \
|
|
("1: moves" #bwl " %2,%1\n" \
|
|
"2:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"3: movel %3,%0\n" \
|
|
" sub" #bwl " %1,%1\n" \
|
|
" jra 2b\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 1b,3b\n" \
|
|
".previous" \
|
|
: "=d"(err), reg(x) \
|
|
: "m"(*(ptr)), "i" (-EFAULT), "0"(0))
|
|
|
|
static inline unsigned long
|
|
__generic_copy_from_user(void *to, const void *from, unsigned long n)
|
|
{
|
|
unsigned long tmp;
|
|
__asm__ __volatile__
|
|
(" tstl %2\n"
|
|
" jeq 2f\n"
|
|
"1: movesl (%1)+,%3\n"
|
|
" movel %3,(%0)+\n"
|
|
" subql #1,%2\n"
|
|
" jne 1b\n"
|
|
"2: movel %4,%2\n"
|
|
" bclr #1,%2\n"
|
|
" jeq 4f\n"
|
|
"3: movesw (%1)+,%3\n"
|
|
" movew %3,(%0)+\n"
|
|
"4: bclr #0,%2\n"
|
|
" jeq 6f\n"
|
|
"5: movesb (%1)+,%3\n"
|
|
" moveb %3,(%0)+\n"
|
|
"6:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"7: movel %2,%%d0\n"
|
|
"71:clrl (%0)+\n"
|
|
" subql #1,%%d0\n"
|
|
" jne 71b\n"
|
|
" lsll #2,%2\n"
|
|
" addl %4,%2\n"
|
|
" btst #1,%4\n"
|
|
" jne 81f\n"
|
|
" btst #0,%4\n"
|
|
" jne 91f\n"
|
|
" jra 6b\n"
|
|
"8: addql #2,%2\n"
|
|
"81:clrw (%0)+\n"
|
|
" btst #0,%4\n"
|
|
" jne 91f\n"
|
|
" jra 6b\n"
|
|
"9: addql #1,%2\n"
|
|
"91:clrb (%0)+\n"
|
|
" jra 6b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,7b\n"
|
|
" .long 3b,8b\n"
|
|
" .long 5b,9b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n), "=&d"(tmp)
|
|
: "d"(n & 3), "0"(to), "1"(from), "2"(n/4)
|
|
: "d0", "memory");
|
|
return n;
|
|
}
|
|
|
|
static inline unsigned long
|
|
__generic_copy_to_user(void *to, const void *from, unsigned long n)
|
|
{
|
|
unsigned long tmp;
|
|
__asm__ __volatile__
|
|
(" tstl %2\n"
|
|
" jeq 3f\n"
|
|
"1: movel (%1)+,%3\n"
|
|
"22:movesl %3,(%0)+\n"
|
|
"2: subql #1,%2\n"
|
|
" jne 1b\n"
|
|
"3: movel %4,%2\n"
|
|
" bclr #1,%2\n"
|
|
" jeq 4f\n"
|
|
" movew (%1)+,%3\n"
|
|
"24:movesw %3,(%0)+\n"
|
|
"4: bclr #0,%2\n"
|
|
" jeq 5f\n"
|
|
" moveb (%1)+,%3\n"
|
|
"25:movesb %3,(%0)+\n"
|
|
"5:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"60:addql #1,%2\n"
|
|
"6: lsll #2,%2\n"
|
|
" addl %4,%2\n"
|
|
" jra 5b\n"
|
|
"7: addql #2,%2\n"
|
|
" jra 5b\n"
|
|
"8: addql #1,%2\n"
|
|
" jra 5b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,60b\n"
|
|
" .long 22b,6b\n"
|
|
" .long 2b,6b\n"
|
|
" .long 24b,7b\n"
|
|
" .long 3b,60b\n"
|
|
" .long 4b,7b\n"
|
|
" .long 25b,8b\n"
|
|
" .long 5b,8b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n), "=&d"(tmp)
|
|
: "r"(n & 3), "0"(to), "1"(from), "2"(n / 4)
|
|
: "memory");
|
|
return n;
|
|
}
|
|
|
|
#define __copy_from_user_big(to, from, n, fixup, copy) \
|
|
__asm__ __volatile__ \
|
|
("10: movesl (%1)+,%%d0\n" \
|
|
" movel %%d0,(%0)+\n" \
|
|
" subql #1,%2\n" \
|
|
" jne 10b\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"11: movel %2,%%d0\n" \
|
|
"13: clrl (%0)+\n" \
|
|
" subql #1,%%d0\n" \
|
|
" jne 13b\n" \
|
|
" lsll #2,%2\n" \
|
|
fixup "\n" \
|
|
" jra 12f\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 10b,11b\n" \
|
|
".previous\n" \
|
|
copy "\n" \
|
|
"12:" \
|
|
: "=a"(to), "=a"(from), "=d"(n) \
|
|
: "0"(to), "1"(from), "2"(n/4) \
|
|
: "d0", "memory")
|
|
|
|
static inline unsigned long
|
|
__constant_copy_from_user(void *to, const void *from, unsigned long n)
|
|
{
|
|
switch (n) {
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
__asm__ __volatile__
|
|
("1: movesb (%1)+,%%d0\n"
|
|
" moveb %%d0,(%0)+\n"
|
|
"2:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"3: addql #1,%2\n"
|
|
" clrb (%0)+\n"
|
|
" jra 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,3b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 2:
|
|
__asm__ __volatile__
|
|
("1: movesw (%1)+,%%d0\n"
|
|
" movew %%d0,(%0)+\n"
|
|
"2:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"3: addql #2,%2\n"
|
|
" clrw (%0)+\n"
|
|
" jra 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,3b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 3:
|
|
__asm__ __volatile__
|
|
("1: movesw (%1)+,%%d0\n"
|
|
" movew %%d0,(%0)+\n"
|
|
"2: movesb (%1)+,%%d0\n"
|
|
" moveb %%d0,(%0)+\n"
|
|
"3:"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"4: addql #2,%2\n"
|
|
" clrw (%0)+\n"
|
|
"5: addql #1,%2\n"
|
|
" clrb (%0)+\n"
|
|
" jra 3b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,4b\n"
|
|
" .long 2b,5b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 4:
|
|
__asm__ __volatile__
|
|
("1: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"2:"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"3: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
" jra 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,3b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 8:
|
|
__asm__ __volatile__
|
|
("1: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"2: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"3:"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"4: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
"5: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
" jra 3b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,4b\n"
|
|
" .long 2b,5b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 12:
|
|
__asm__ __volatile__
|
|
("1: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"2: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"3: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"4:"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"5: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
"6: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
"7: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
" jra 4b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,5b\n"
|
|
" .long 2b,6b\n"
|
|
" .long 3b,7b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 16:
|
|
__asm__ __volatile__
|
|
("1: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"2: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"3: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"4: movesl (%1)+,%%d0\n"
|
|
" movel %%d0,(%0)+\n"
|
|
"5:"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"6: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
"7: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
"8: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
"9: addql #4,%2\n"
|
|
" clrl (%0)+\n"
|
|
" jra 5b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,6b\n"
|
|
" .long 2b,7b\n"
|
|
" .long 3b,8b\n"
|
|
" .long 4b,9b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
default:
|
|
switch (n & 3) {
|
|
case 0:
|
|
__copy_from_user_big(to, from, n, "", "");
|
|
break;
|
|
case 1:
|
|
__copy_from_user_big(to, from, n,
|
|
/* fixup */
|
|
"1: addql #1,%2\n"
|
|
" clrb (%0)+",
|
|
/* copy */
|
|
"2: movesb (%1)+,%%d0\n"
|
|
" moveb %%d0,(%0)+\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .long 2b,1b\n"
|
|
".previous");
|
|
break;
|
|
case 2:
|
|
__copy_from_user_big(to, from, n,
|
|
/* fixup */
|
|
"1: addql #2,%2\n"
|
|
" clrw (%0)+",
|
|
/* copy */
|
|
"2: movesw (%1)+,%%d0\n"
|
|
" movew %%d0,(%0)+\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .long 2b,1b\n"
|
|
".previous");
|
|
break;
|
|
case 3:
|
|
__copy_from_user_big(to, from, n,
|
|
/* fixup */
|
|
"1: addql #2,%2\n"
|
|
" clrw (%0)+\n"
|
|
"2: addql #1,%2\n"
|
|
" clrb (%0)+",
|
|
/* copy */
|
|
"3: movesw (%1)+,%%d0\n"
|
|
" movew %%d0,(%0)+\n"
|
|
"4: movesb (%1)+,%%d0\n"
|
|
" moveb %%d0,(%0)+\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .long 3b,1b\n"
|
|
" .long 4b,2b\n"
|
|
".previous");
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
#define __copy_to_user_big(to, from, n, fixup, copy) \
|
|
__asm__ __volatile__ \
|
|
("10: movel (%1)+,%%d0\n" \
|
|
"31: movesl %%d0,(%0)+\n" \
|
|
"11: subql #1,%2\n" \
|
|
" jne 10b\n" \
|
|
"41:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"22: addql #1,%2\n" \
|
|
"12: lsll #2,%2\n" \
|
|
fixup "\n" \
|
|
" jra 13f\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 10b,22b\n" \
|
|
" .long 31b,12b\n" \
|
|
" .long 11b,12b\n" \
|
|
" .long 41b,22b\n" \
|
|
".previous\n" \
|
|
copy "\n" \
|
|
"13:" \
|
|
: "=a"(to), "=a"(from), "=d"(n) \
|
|
: "0"(to), "1"(from), "2"(n/4) \
|
|
: "d0", "memory")
|
|
|
|
#define __copy_to_user_inatomic __copy_to_user
|
|
#define __copy_from_user_inatomic __copy_from_user
|
|
|
|
static inline unsigned long
|
|
__constant_copy_to_user(void *to, const void *from, unsigned long n)
|
|
{
|
|
switch (n) {
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
__asm__ __volatile__
|
|
(" moveb (%1)+,%%d0\n"
|
|
"21:movesb %%d0,(%0)+\n"
|
|
"1:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"2: addql #1,%2\n"
|
|
" jra 1b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n "
|
|
" .long 21b,2b\n"
|
|
" .long 1b,2b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 2:
|
|
__asm__ __volatile__
|
|
(" movew (%1)+,%%d0\n"
|
|
"21:movesw %%d0,(%0)+\n"
|
|
"1:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"2: addql #2,%2\n"
|
|
" jra 1b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 21b,2b\n"
|
|
" .long 1b,2b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 3:
|
|
__asm__ __volatile__
|
|
(" movew (%1)+,%%d0\n"
|
|
"21:movesw %%d0,(%0)+\n"
|
|
"1: moveb (%1)+,%%d0\n"
|
|
"22:movesb %%d0,(%0)+\n"
|
|
"2:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"3: addql #2,%2\n"
|
|
"4: addql #1,%2\n"
|
|
" jra 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 21b,3b\n"
|
|
" .long 1b,3b\n"
|
|
" .long 22b,4b\n"
|
|
" .long 2b,4b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 4:
|
|
__asm__ __volatile__
|
|
(" movel (%1)+,%%d0\n"
|
|
"21:movesl %%d0,(%0)+\n"
|
|
"1:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"2: addql #4,%2\n"
|
|
" jra 1b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 21b,2b\n"
|
|
" .long 1b,2b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 8:
|
|
__asm__ __volatile__
|
|
(" movel (%1)+,%%d0\n"
|
|
"21:movesl %%d0,(%0)+\n"
|
|
"1: movel (%1)+,%%d0\n"
|
|
"22:movesl %%d0,(%0)+\n"
|
|
"2:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"3: addql #4,%2\n"
|
|
"4: addql #4,%2\n"
|
|
" jra 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 21b,3b\n"
|
|
" .long 1b,3b\n"
|
|
" .long 22b,4b\n"
|
|
" .long 2b,4b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 12:
|
|
__asm__ __volatile__
|
|
(" movel (%1)+,%%d0\n"
|
|
"21:movesl %%d0,(%0)+\n"
|
|
"1: movel (%1)+,%%d0\n"
|
|
"22:movesl %%d0,(%0)+\n"
|
|
"2: movel (%1)+,%%d0\n"
|
|
"23:movesl %%d0,(%0)+\n"
|
|
"3:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"4: addql #4,%2\n"
|
|
"5: addql #4,%2\n"
|
|
"6: addql #4,%2\n"
|
|
" jra 3b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 21b,4b\n"
|
|
" .long 1b,4b\n"
|
|
" .long 22b,5b\n"
|
|
" .long 2b,5b\n"
|
|
" .long 23b,6b\n"
|
|
" .long 3b,6b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
case 16:
|
|
__asm__ __volatile__
|
|
(" movel (%1)+,%%d0\n"
|
|
"21:movesl %%d0,(%0)+\n"
|
|
"1: movel (%1)+,%%d0\n"
|
|
"22:movesl %%d0,(%0)+\n"
|
|
"2: movel (%1)+,%%d0\n"
|
|
"23:movesl %%d0,(%0)+\n"
|
|
"3: movel (%1)+,%%d0\n"
|
|
"24:movesl %%d0,(%0)+\n"
|
|
"4:"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"5: addql #4,%2\n"
|
|
"6: addql #4,%2\n"
|
|
"7: addql #4,%2\n"
|
|
"8: addql #4,%2\n"
|
|
" jra 4b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 21b,5b\n"
|
|
" .long 1b,5b\n"
|
|
" .long 22b,6b\n"
|
|
" .long 2b,6b\n"
|
|
" .long 23b,7b\n"
|
|
" .long 3b,7b\n"
|
|
" .long 24b,8b\n"
|
|
" .long 4b,8b\n"
|
|
".previous"
|
|
: "=a"(to), "=a"(from), "=d"(n)
|
|
: "0"(to), "1"(from), "2"(0)
|
|
: "d0", "memory");
|
|
break;
|
|
default:
|
|
switch (n & 3) {
|
|
case 0:
|
|
__copy_to_user_big(to, from, n, "", "");
|
|
break;
|
|
case 1:
|
|
__copy_to_user_big(to, from, n,
|
|
/* fixup */
|
|
"1: addql #1,%2",
|
|
/* copy */
|
|
" moveb (%1)+,%%d0\n"
|
|
"22:movesb %%d0,(%0)+\n"
|
|
"2:"
|
|
".section __ex_table,\"a\"\n"
|
|
" .long 22b,1b\n"
|
|
" .long 2b,1b\n"
|
|
".previous");
|
|
break;
|
|
case 2:
|
|
__copy_to_user_big(to, from, n,
|
|
/* fixup */
|
|
"1: addql #2,%2",
|
|
/* copy */
|
|
" movew (%1)+,%%d0\n"
|
|
"22:movesw %%d0,(%0)+\n"
|
|
"2:"
|
|
".section __ex_table,\"a\"\n"
|
|
" .long 22b,1b\n"
|
|
" .long 2b,1b\n"
|
|
".previous");
|
|
break;
|
|
case 3:
|
|
__copy_to_user_big(to, from, n,
|
|
/* fixup */
|
|
"1: addql #2,%2\n"
|
|
"2: addql #1,%2",
|
|
/* copy */
|
|
" movew (%1)+,%%d0\n"
|
|
"23:movesw %%d0,(%0)+\n"
|
|
"3: moveb (%1)+,%%d0\n"
|
|
"24:movesb %%d0,(%0)+\n"
|
|
"4:"
|
|
".section __ex_table,\"a\"\n"
|
|
" .long 23b,1b\n"
|
|
" .long 3b,1b\n"
|
|
" .long 24b,2b\n"
|
|
" .long 4b,2b\n"
|
|
".previous");
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
#define copy_from_user(to, from, n) \
|
|
(__builtin_constant_p(n) ? \
|
|
__constant_copy_from_user(to, from, n) : \
|
|
__generic_copy_from_user(to, from, n))
|
|
|
|
#define copy_to_user(to, from, n) \
|
|
(__builtin_constant_p(n) ? \
|
|
__constant_copy_to_user(to, from, n) : \
|
|
__generic_copy_to_user(to, from, n))
|
|
|
|
#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
|
|
#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
|
|
|
|
/*
|
|
* Copy a null terminated string from userspace.
|
|
*/
|
|
|
|
static inline long
|
|
strncpy_from_user(char *dst, const char *src, long count)
|
|
{
|
|
long res;
|
|
if (count == 0) return count;
|
|
__asm__ __volatile__
|
|
("1: movesb (%2)+,%%d0\n"
|
|
"12:moveb %%d0,(%1)+\n"
|
|
" jeq 2f\n"
|
|
" subql #1,%3\n"
|
|
" jne 1b\n"
|
|
"2: subl %3,%0\n"
|
|
"3:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"4: movel %4,%0\n"
|
|
" jra 3b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,4b\n"
|
|
" .long 12b,4b\n"
|
|
".previous"
|
|
: "=d"(res), "=a"(dst), "=a"(src), "=d"(count)
|
|
: "i"(-EFAULT), "0"(count), "1"(dst), "2"(src), "3"(count)
|
|
: "d0", "memory");
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Return the size of a string (including the ending 0)
|
|
*
|
|
* Return 0 on exception, a value greater than N if too long
|
|
*/
|
|
static inline long strnlen_user(const char *src, long n)
|
|
{
|
|
long res;
|
|
|
|
res = -(long)src;
|
|
__asm__ __volatile__
|
|
("1:\n"
|
|
" tstl %2\n"
|
|
" jeq 3f\n"
|
|
"2: movesb (%1)+,%%d0\n"
|
|
"22:\n"
|
|
" subql #1,%2\n"
|
|
" tstb %%d0\n"
|
|
" jne 1b\n"
|
|
" jra 4f\n"
|
|
"3:\n"
|
|
" addql #1,%0\n"
|
|
"4:\n"
|
|
" addl %1,%0\n"
|
|
"5:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"6: moveq %3,%0\n"
|
|
" jra 5b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 2b,6b\n"
|
|
" .long 22b,6b\n"
|
|
".previous"
|
|
: "=d"(res), "=a"(src), "=d"(n)
|
|
: "i"(0), "0"(res), "1"(src), "2"(n)
|
|
: "d0");
|
|
return res;
|
|
}
|
|
|
|
#define strlen_user(str) strnlen_user(str, 32767)
|
|
|
|
/*
|
|
* Zero Userspace
|
|
*/
|
|
|
|
static inline unsigned long
|
|
clear_user(void *to, unsigned long n)
|
|
{
|
|
__asm__ __volatile__
|
|
(" tstl %1\n"
|
|
" jeq 3f\n"
|
|
"1: movesl %3,(%0)+\n"
|
|
"2: subql #1,%1\n"
|
|
" jne 1b\n"
|
|
"3: movel %2,%1\n"
|
|
" bclr #1,%1\n"
|
|
" jeq 4f\n"
|
|
"24:movesw %3,(%0)+\n"
|
|
"4: bclr #0,%1\n"
|
|
" jeq 5f\n"
|
|
"25:movesb %3,(%0)+\n"
|
|
"5:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .even\n"
|
|
"61:addql #1,%1\n"
|
|
"6: lsll #2,%1\n"
|
|
" addl %2,%1\n"
|
|
" jra 5b\n"
|
|
"7: addql #2,%1\n"
|
|
" jra 5b\n"
|
|
"8: addql #1,%1\n"
|
|
" jra 5b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .align 4\n"
|
|
" .long 1b,61b\n"
|
|
" .long 2b,6b\n"
|
|
" .long 3b,61b\n"
|
|
" .long 24b,7b\n"
|
|
" .long 4b,7b\n"
|
|
" .long 25b,8b\n"
|
|
" .long 5b,8b\n"
|
|
".previous"
|
|
: "=a"(to), "=d"(n)
|
|
: "r"(n & 3), "r"(0), "0"(to), "1"(n/4));
|
|
return n;
|
|
}
|
|
|
|
#endif /* _M68K_UACCESS_H */
|