#include <linux/errno.h>
#include <asm/lowcore.h>
-#include <asm/offsets.h>
+#include <asm/asm-offsets.h>
.text
.align 4
# move with the reduced length which is < 256
5: mvcp 0(%r5,%r2),0(%r4),%r0
slr %r3,%r5
-6: lr %r2,%r3
+ alr %r2,%r5
+6: lr %r5,%r3 # copy remaining size
+ ahi %r5,-1 # subtract 1 for xc loop
+ bras %r4,8f
+ xc 0(1,%r2),0(%r2)
+7: xc 0(256,%r2),0(%r2)
+ la %r2,256(%r2)
+8: ahi %r5,-256
+ jnm 7b
+ ex %r5,0(%r4)
+9: lr %r2,%r3
br %r14
.section __ex_table,"a"
.long 0b,4b
.globl __copy_in_user_asm
# %r2 = from, %r3 = n, %r4 = to
__copy_in_user_asm:
+ ahi %r3,-1
+ jo 6f
sacf 256
- bras 1,1f
- mvc 0(1,%r4),0(%r2)
-0: mvc 0(256,%r4),0(%r2)
- la %r2,256(%r2)
- la %r4,256(%r4)
-1: ahi %r3,-256
- jnm 0b
-2: ex %r3,0(%r1)
- sacf 0
- slr %r2,%r2
- br 14
-3: mvc 0(1,%r4),0(%r2)
+ bras %r1,4f
+0: ahi %r3,257
+1: mvc 0(1,%r4),0(%r2)
la %r2,1(%r2)
la %r4,1(%r4)
ahi %r3,-1
+ jnz 1b
+2: lr %r2,%r3
+ br %r14
+3: mvc 0(256,%r4),0(%r2)
+ la %r2,256(%r2)
+ la %r4,256(%r4)
+4: ahi %r3,-256
jnm 3b
-4: lr %r2,%r3
+5: ex %r3,4(%r1)
sacf 0
+6: slr %r2,%r2
br %r14
.section __ex_table,"a"
- .long 0b,3b
- .long 2b,3b
- .long 3b,4b
+ .long 1b,2b
+ .long 3b,0b
+ .long 5b,0b
.previous
.align 4
0: srst %r2,%r1
jo 0b
sacf 0
- jh 1f # \0 found in string ?
ahi %r2,1 # strnlen_user result includes the \0
-1: slr %r2,%r3
+ # or return count+1 if \0 not found
+ slr %r2,%r3
br %r14
2: sacf 0
- lhi %r2,-EFAULT
+ slr %r2,%r2 # return 0 on exception
br %r14
.section __ex_table,"a"
.long 0b,2b