You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
391 lines
8.9 KiB
391 lines
8.9 KiB
/*
|
|
* User address space access functions.
|
|
* The non inlined parts of asm-m32r/uaccess.h are here.
|
|
*
|
|
* Copyright 1997 Andi Kleen <ak@muc.de>
|
|
* Copyright 1997 Linus Torvalds
|
|
* Copyright 2001, 2002, 2004 Hirokazu Takata
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/prefetch.h>
|
|
#include <linux/string.h>
|
|
#include <linux/thread_info.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
unsigned long
|
|
__generic_copy_to_user(void __user *to, const void *from, unsigned long n)
|
|
{
|
|
prefetch(from);
|
|
if (access_ok(VERIFY_WRITE, to, n))
|
|
__copy_user(to,from,n);
|
|
return n;
|
|
}
|
|
|
|
unsigned long
|
|
__generic_copy_from_user(void *to, const void __user *from, unsigned long n)
|
|
{
|
|
prefetchw(to);
|
|
if (access_ok(VERIFY_READ, from, n))
|
|
__copy_user_zeroing(to,from,n);
|
|
else
|
|
memset(to, 0, n);
|
|
return n;
|
|
}
|
|
|
|
|
|
/*
|
|
* Copy a null terminated string from userspace.
|
|
*/
|
|
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
|
|
|
#define __do_strncpy_from_user(dst,src,count,res) \
|
|
do { \
|
|
int __d0, __d1, __d2; \
|
|
__asm__ __volatile__( \
|
|
" beqz %1, 2f\n" \
|
|
" .fillinsn\n" \
|
|
"0: ldb r14, @%3 || addi %3, #1\n" \
|
|
" stb r14, @%4 || addi %4, #1\n" \
|
|
" beqz r14, 1f\n" \
|
|
" addi %1, #-1\n" \
|
|
" bnez %1, 0b\n" \
|
|
" .fillinsn\n" \
|
|
"1: sub %0, %1\n" \
|
|
" .fillinsn\n" \
|
|
"2:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .balign 4\n" \
|
|
"3: seth r14, #high(2b)\n" \
|
|
" or3 r14, r14, #low(2b)\n" \
|
|
" jmp r14 || ldi %0, #%5\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .balign 4\n" \
|
|
" .long 0b,3b\n" \
|
|
".previous" \
|
|
: "=&r"(res), "=&r"(count), "=&r" (__d0), "=&r" (__d1), \
|
|
"=&r" (__d2) \
|
|
: "i"(-EFAULT), "0"(count), "1"(count), "3"(src), \
|
|
"4"(dst) \
|
|
: "r14", "cbit", "memory"); \
|
|
} while (0)
|
|
|
|
#else /* not CONFIG_ISA_DUAL_ISSUE */
|
|
|
|
#define __do_strncpy_from_user(dst,src,count,res) \
|
|
do { \
|
|
int __d0, __d1, __d2; \
|
|
__asm__ __volatile__( \
|
|
" beqz %1, 2f\n" \
|
|
" .fillinsn\n" \
|
|
"0: ldb r14, @%3\n" \
|
|
" stb r14, @%4\n" \
|
|
" addi %3, #1\n" \
|
|
" addi %4, #1\n" \
|
|
" beqz r14, 1f\n" \
|
|
" addi %1, #-1\n" \
|
|
" bnez %1, 0b\n" \
|
|
" .fillinsn\n" \
|
|
"1: sub %0, %1\n" \
|
|
" .fillinsn\n" \
|
|
"2:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .balign 4\n" \
|
|
"3: ldi %0, #%5\n" \
|
|
" seth r14, #high(2b)\n" \
|
|
" or3 r14, r14, #low(2b)\n" \
|
|
" jmp r14\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .balign 4\n" \
|
|
" .long 0b,3b\n" \
|
|
".previous" \
|
|
: "=&r"(res), "=&r"(count), "=&r" (__d0), "=&r" (__d1), \
|
|
"=&r" (__d2) \
|
|
: "i"(-EFAULT), "0"(count), "1"(count), "3"(src), \
|
|
"4"(dst) \
|
|
: "r14", "cbit", "memory"); \
|
|
} while (0)
|
|
|
|
#endif /* CONFIG_ISA_DUAL_ISSUE */
|
|
|
|
long
|
|
__strncpy_from_user(char *dst, const char __user *src, long count)
|
|
{
|
|
long res;
|
|
__do_strncpy_from_user(dst, src, count, res);
|
|
return res;
|
|
}
|
|
|
|
long
|
|
strncpy_from_user(char *dst, const char __user *src, long count)
|
|
{
|
|
long res = -EFAULT;
|
|
if (access_ok(VERIFY_READ, src, 1))
|
|
__do_strncpy_from_user(dst, src, count, res);
|
|
return res;
|
|
}
|
|
|
|
|
|
/*
|
|
* Zero Userspace
|
|
*/
|
|
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
|
|
|
#define __do_clear_user(addr,size) \
|
|
do { \
|
|
int __dst, __c; \
|
|
__asm__ __volatile__( \
|
|
" beqz %1, 9f\n" \
|
|
" and3 r14, %0, #3\n" \
|
|
" bnez r14, 2f\n" \
|
|
" and3 r14, %1, #3\n" \
|
|
" bnez r14, 2f\n" \
|
|
" and3 %1, %1, #3\n" \
|
|
" beqz %2, 2f\n" \
|
|
" addi %0, #-4\n" \
|
|
" .fillinsn\n" \
|
|
"0: ; word clear \n" \
|
|
" st %6, @+%0 || addi %2, #-1\n" \
|
|
" bnez %2, 0b\n" \
|
|
" beqz %1, 9f\n" \
|
|
" .fillinsn\n" \
|
|
"2: ; byte clear \n" \
|
|
" stb %6, @%0 || addi %1, #-1\n" \
|
|
" addi %0, #1\n" \
|
|
" bnez %1, 2b\n" \
|
|
" .fillinsn\n" \
|
|
"9:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .balign 4\n" \
|
|
"4: slli %2, #2\n" \
|
|
" seth r14, #high(9b)\n" \
|
|
" or3 r14, r14, #low(9b)\n" \
|
|
" jmp r14 || add %1, %2\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .balign 4\n" \
|
|
" .long 0b,4b\n" \
|
|
" .long 2b,9b\n" \
|
|
".previous\n" \
|
|
: "=&r"(__dst), "=&r"(size), "=&r"(__c) \
|
|
: "0"(addr), "1"(size), "2"(size / 4), "r"(0) \
|
|
: "r14", "cbit", "memory"); \
|
|
} while (0)
|
|
|
|
#else /* not CONFIG_ISA_DUAL_ISSUE */
|
|
|
|
#define __do_clear_user(addr,size) \
|
|
do { \
|
|
int __dst, __c; \
|
|
__asm__ __volatile__( \
|
|
" beqz %1, 9f\n" \
|
|
" and3 r14, %0, #3\n" \
|
|
" bnez r14, 2f\n" \
|
|
" and3 r14, %1, #3\n" \
|
|
" bnez r14, 2f\n" \
|
|
" and3 %1, %1, #3\n" \
|
|
" beqz %2, 2f\n" \
|
|
" addi %0, #-4\n" \
|
|
" .fillinsn\n" \
|
|
"0: st %6, @+%0 ; word clear \n" \
|
|
" addi %2, #-1\n" \
|
|
" bnez %2, 0b\n" \
|
|
" beqz %1, 9f\n" \
|
|
" .fillinsn\n" \
|
|
"2: stb %6, @%0 ; byte clear \n" \
|
|
" addi %1, #-1\n" \
|
|
" addi %0, #1\n" \
|
|
" bnez %1, 2b\n" \
|
|
" .fillinsn\n" \
|
|
"9:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .balign 4\n" \
|
|
"4: slli %2, #2\n" \
|
|
" add %1, %2\n" \
|
|
" seth r14, #high(9b)\n" \
|
|
" or3 r14, r14, #low(9b)\n" \
|
|
" jmp r14\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .balign 4\n" \
|
|
" .long 0b,4b\n" \
|
|
" .long 2b,9b\n" \
|
|
".previous\n" \
|
|
: "=&r"(__dst), "=&r"(size), "=&r"(__c) \
|
|
: "0"(addr), "1"(size), "2"(size / 4), "r"(0) \
|
|
: "r14", "cbit", "memory"); \
|
|
} while (0)
|
|
|
|
#endif /* not CONFIG_ISA_DUAL_ISSUE */
|
|
|
|
unsigned long
|
|
clear_user(void __user *to, unsigned long n)
|
|
{
|
|
if (access_ok(VERIFY_WRITE, to, n))
|
|
__do_clear_user(to, n);
|
|
return n;
|
|
}
|
|
|
|
unsigned long
|
|
__clear_user(void __user *to, unsigned long n)
|
|
{
|
|
__do_clear_user(to, n);
|
|
return n;
|
|
}
|
|
|
|
/*
|
|
* Return the size of a string (including the ending 0)
|
|
*
|
|
* Return 0 on exception, a value greater than N if too long
|
|
*/
|
|
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
|
|
|
long strnlen_user(const char __user *s, long n)
|
|
{
|
|
unsigned long mask = -__addr_ok(s);
|
|
unsigned long res;
|
|
|
|
__asm__ __volatile__(
|
|
" and %0, %5 || mv r1, %1\n"
|
|
" beqz %0, strnlen_exit\n"
|
|
" and3 r0, %1, #3\n"
|
|
" bnez r0, strnlen_byte_loop\n"
|
|
" cmpui %0, #4\n"
|
|
" bc strnlen_byte_loop\n"
|
|
"strnlen_word_loop:\n"
|
|
"0: ld r0, @%1+\n"
|
|
" pcmpbz r0\n"
|
|
" bc strnlen_last_bytes_fixup\n"
|
|
" addi %0, #-4\n"
|
|
" beqz %0, strnlen_exit\n"
|
|
" bgtz %0, strnlen_word_loop\n"
|
|
"strnlen_last_bytes:\n"
|
|
" mv %0, %4\n"
|
|
"strnlen_last_bytes_fixup:\n"
|
|
" addi %1, #-4\n"
|
|
"strnlen_byte_loop:\n"
|
|
"1: ldb r0, @%1 || addi %0, #-1\n"
|
|
" beqz r0, strnlen_exit\n"
|
|
" addi %1, #1\n"
|
|
" bnez %0, strnlen_byte_loop\n"
|
|
"strnlen_exit:\n"
|
|
" sub %1, r1\n"
|
|
" add3 %0, %1, #1\n"
|
|
" .fillinsn\n"
|
|
"9:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .balign 4\n"
|
|
"4: addi %1, #-4\n"
|
|
" .fillinsn\n"
|
|
"5: seth r1, #high(9b)\n"
|
|
" or3 r1, r1, #low(9b)\n"
|
|
" jmp r1 || ldi %0, #0\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .balign 4\n"
|
|
" .long 0b,4b\n"
|
|
" .long 1b,5b\n"
|
|
".previous"
|
|
: "=&r" (res), "=r" (s)
|
|
: "0" (n), "1" (s), "r" (n & 3), "r" (mask), "r"(0x01010101)
|
|
: "r0", "r1", "cbit");
|
|
|
|
/* NOTE: strnlen_user() algorism:
|
|
* {
|
|
* char *p;
|
|
* for (p = s; n-- && *p != '\0'; ++p)
|
|
* ;
|
|
* return p - s + 1;
|
|
* }
|
|
*/
|
|
|
|
/* NOTE: If a null char. exists, return 0.
|
|
* if ((x - 0x01010101) & ~x & 0x80808080)\n"
|
|
* return 0;\n"
|
|
*/
|
|
|
|
return res & mask;
|
|
}
|
|
|
|
#else /* not CONFIG_ISA_DUAL_ISSUE */
|
|
|
|
long strnlen_user(const char __user *s, long n)
|
|
{
|
|
unsigned long mask = -__addr_ok(s);
|
|
unsigned long res;
|
|
|
|
__asm__ __volatile__(
|
|
" and %0, %5\n"
|
|
" mv r1, %1\n"
|
|
" beqz %0, strnlen_exit\n"
|
|
" and3 r0, %1, #3\n"
|
|
" bnez r0, strnlen_byte_loop\n"
|
|
" cmpui %0, #4\n"
|
|
" bc strnlen_byte_loop\n"
|
|
" sll3 r3, %6, #7\n"
|
|
"strnlen_word_loop:\n"
|
|
"0: ld r0, @%1+\n"
|
|
" not r2, r0\n"
|
|
" sub r0, %6\n"
|
|
" and r2, r3\n"
|
|
" and r2, r0\n"
|
|
" bnez r2, strnlen_last_bytes_fixup\n"
|
|
" addi %0, #-4\n"
|
|
" beqz %0, strnlen_exit\n"
|
|
" bgtz %0, strnlen_word_loop\n"
|
|
"strnlen_last_bytes:\n"
|
|
" mv %0, %4\n"
|
|
"strnlen_last_bytes_fixup:\n"
|
|
" addi %1, #-4\n"
|
|
"strnlen_byte_loop:\n"
|
|
"1: ldb r0, @%1\n"
|
|
" addi %0, #-1\n"
|
|
" beqz r0, strnlen_exit\n"
|
|
" addi %1, #1\n"
|
|
" bnez %0, strnlen_byte_loop\n"
|
|
"strnlen_exit:\n"
|
|
" sub %1, r1\n"
|
|
" add3 %0, %1, #1\n"
|
|
" .fillinsn\n"
|
|
"9:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
" .balign 4\n"
|
|
"4: addi %1, #-4\n"
|
|
" .fillinsn\n"
|
|
"5: ldi %0, #0\n"
|
|
" seth r1, #high(9b)\n"
|
|
" or3 r1, r1, #low(9b)\n"
|
|
" jmp r1\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .balign 4\n"
|
|
" .long 0b,4b\n"
|
|
" .long 1b,5b\n"
|
|
".previous"
|
|
: "=&r" (res), "=r" (s)
|
|
: "0" (n), "1" (s), "r" (n & 3), "r" (mask), "r"(0x01010101)
|
|
: "r0", "r1", "r2", "r3", "cbit");
|
|
|
|
/* NOTE: strnlen_user() algorism:
|
|
* {
|
|
* char *p;
|
|
* for (p = s; n-- && *p != '\0'; ++p)
|
|
* ;
|
|
* return p - s + 1;
|
|
* }
|
|
*/
|
|
|
|
/* NOTE: If a null char. exists, return 0.
|
|
* if ((x - 0x01010101) & ~x & 0x80808080)\n"
|
|
* return 0;\n"
|
|
*/
|
|
|
|
return res & mask;
|
|
}
|
|
|
|
#endif /* CONFIG_ISA_DUAL_ISSUE */
|
|
|
|
|