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metag/usercopy: Add 64-bit get_user support 

Metag already supports 64-bit put_user, so add support for 64-bit
get_user too so that the test_user_copy module can test both.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
This commit is contained in:
James Hogan 2017-03-31 15:40:52 +01:00
parent fc1b759ae4
commit d3ba2e922d
2 changed files with 31 additions and 2 deletions
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9
arch/metag/include/asm/uaccess.h
View File

@ -138,7 +138,8 @@ extern long __get_user_bad(void);
#define __get_user_nocheck(x, ptr, size) \
({ \
long __gu_err, __gu_val; \
long __gu_err; \
long long __gu_val; \
__get_user_size(__gu_val, (ptr), (size), __gu_err); \
(x) = (__force __typeof__(*(ptr)))__gu_val; \
__gu_err; \
@ -146,7 +147,8 @@ extern long __get_user_bad(void);
#define __get_user_check(x, ptr, size) \
({ \
long __gu_err = -EFAULT, __gu_val = 0; \
long __gu_err = -EFAULT; \
long long __gu_val = 0; \
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
if (access_ok(VERIFY_READ, __gu_addr, size)) \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
@ -157,6 +159,7 @@ extern long __get_user_bad(void);
extern unsigned char __get_user_asm_b(const void __user *addr, long *err);
extern unsigned short __get_user_asm_w(const void __user *addr, long *err);
extern unsigned int __get_user_asm_d(const void __user *addr, long *err);
extern unsigned long long __get_user_asm_l(const void __user *addr, long *err);
#define __get_user_size(x, ptr, size, retval) \
do { \
@ -168,6 +171,8 @@ do { \
x = __get_user_asm_w(ptr, &retval); break; \
case 4: \
x = __get_user_asm_d(ptr, &retval); break; \
case 8: \
x = __get_user_asm_l(ptr, &retval); break; \
default: \
(x) = __get_user_bad(); \
} \

24
arch/metag/lib/usercopy.c
View File

@ -1044,6 +1044,30 @@ unsigned int __get_user_asm_d(const void __user *addr, long *err)
}
EXPORT_SYMBOL(__get_user_asm_d);
unsigned long long __get_user_asm_l(const void __user *addr, long *err)
{
register unsigned long long x asm ("D0Re0") = 0;
asm volatile (
" GETL %0,%t0,[%2]\n"
"1:\n"
" GETL %0,%t0,[%2]\n"
"2:\n"
" .section .fixup,\"ax\"\n"
"3: MOV D0FrT,%3\n"
" SETD [%1],D0FrT\n"
" MOVT D0FrT,#HI(2b)\n"
" JUMP D0FrT,#LO(2b)\n"
" .previous\n"
" .section __ex_table,\"a\"\n"
" .long 1b,3b\n"
" .previous\n"
: "=r" (x)
: "r" (err), "r" (addr), "P" (-EFAULT)
: "D0FrT");
return x;
}
EXPORT_SYMBOL(__get_user_asm_l);
long __put_user_asm_b(unsigned int x, void __user *addr)
{
register unsigned int err asm ("D0Re0") = 0;