diff options
Diffstat (limited to 'arch/s390/lib/uaccess.S')
| -rw-r--r-- | arch/s390/lib/uaccess.S | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/arch/s390/lib/uaccess.S b/arch/s390/lib/uaccess.S deleted file mode 100644 index 8372752..0000000 --- a/arch/s390/lib/uaccess.S +++ /dev/null @@ -1,211 +0,0 @@ -/* - * arch/s390/lib/uaccess.S - * __copy_{from|to}_user functions. - * - * s390 - * Copyright (C) 2000,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation - * Authors(s): Martin Schwidefsky (schwidefsky@de.ibm.com) - * - * These functions have standard call interface - */ - -#include <linux/errno.h> -#include <asm/lowcore.h> -#include <asm/asm-offsets.h> - - .text - .align 4 - .globl __copy_from_user_asm - # %r2 = to, %r3 = n, %r4 = from -__copy_from_user_asm: - slr %r0,%r0 -0: mvcp 0(%r3,%r2),0(%r4),%r0 - jnz 1f - slr %r2,%r2 - br %r14 -1: la %r2,256(%r2) - la %r4,256(%r4) - ahi %r3,-256 -2: mvcp 0(%r3,%r2),0(%r4),%r0 - jnz 1b -3: slr %r2,%r2 - br %r14 -4: lhi %r0,-4096 - lr %r5,%r4 - slr %r5,%r0 - nr %r5,%r0 # %r5 = (%r4 + 4096) & -4096 - slr %r5,%r4 # %r5 = #bytes to next user page boundary - clr %r3,%r5 # copy crosses next page boundary ? - jnh 6f # no, the current page faulted - # move with the reduced length which is < 256 -5: mvcp 0(%r5,%r2),0(%r4),%r0 - slr %r3,%r5 -6: lr %r2,%r3 - br %r14 - .section __ex_table,"a" - .long 0b,4b - .long 2b,4b - .long 5b,6b - .previous - - .align 4 - .text - .globl __copy_to_user_asm - # %r2 = from, %r3 = n, %r4 = to -__copy_to_user_asm: - slr %r0,%r0 -0: mvcs 0(%r3,%r4),0(%r2),%r0 - jnz 1f - slr %r2,%r2 - br %r14 -1: la %r2,256(%r2) - la %r4,256(%r4) - ahi %r3,-256 -2: mvcs 0(%r3,%r4),0(%r2),%r0 - jnz 1b -3: slr %r2,%r2 - br %r14 -4: lhi %r0,-4096 - lr %r5,%r4 - slr %r5,%r0 - nr %r5,%r0 # %r5 = (%r4 + 4096) & -4096 - slr %r5,%r4 # %r5 = #bytes to next user page boundary - clr %r3,%r5 # copy crosses next page boundary ? - jnh 6f # no, the current page faulted - # move with the reduced length which is < 256 -5: mvcs 0(%r5,%r4),0(%r2),%r0 - slr %r3,%r5 -6: lr %r2,%r3 - br %r14 - .section __ex_table,"a" - .long 0b,4b - .long 2b,4b - .long 5b,6b - .previous - - .align 4 - .text - .globl __copy_in_user_asm - # %r2 = from, %r3 = n, %r4 = to -__copy_in_user_asm: - ahi %r3,-1 - jo 6f - sacf 256 - 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 -5: ex %r3,4(%r1) - sacf 0 -6: slr %r2,%r2 - br %r14 - .section __ex_table,"a" - .long 1b,2b - .long 3b,0b - .long 5b,0b - .previous - - .align 4 - .text - .globl __clear_user_asm - # %r2 = to, %r3 = n -__clear_user_asm: - bras %r5,0f - .long empty_zero_page -0: l %r5,0(%r5) - slr %r0,%r0 -1: mvcs 0(%r3,%r2),0(%r5),%r0 - jnz 2f - slr %r2,%r2 - br %r14 -2: la %r2,256(%r2) - ahi %r3,-256 -3: mvcs 0(%r3,%r2),0(%r5),%r0 - jnz 2b -4: slr %r2,%r2 - br %r14 -5: lhi %r0,-4096 - lr %r4,%r2 - slr %r4,%r0 - nr %r4,%r0 # %r4 = (%r2 + 4096) & -4096 - slr %r4,%r2 # %r4 = #bytes to next user page boundary - clr %r3,%r4 # clear crosses next page boundary ? - jnh 7f # no, the current page faulted - # clear with the reduced length which is < 256 -6: mvcs 0(%r4,%r2),0(%r5),%r0 - slr %r3,%r4 -7: lr %r2,%r3 - br %r14 - .section __ex_table,"a" - .long 1b,5b - .long 3b,5b - .long 6b,7b - .previous - - .align 4 - .text - .globl __strncpy_from_user_asm - # %r2 = count, %r3 = dst, %r4 = src -__strncpy_from_user_asm: - lhi %r0,0 - lr %r1,%r4 - la %r4,0(%r4) # clear high order bit from %r4 - la %r2,0(%r2,%r4) # %r2 points to first byte after string - sacf 256 -0: srst %r2,%r1 - jo 0b - sacf 0 - lr %r1,%r2 - jh 1f # \0 found in string ? - ahi %r1,1 # include \0 in copy -1: slr %r1,%r4 # %r1 = copy length (without \0) - slr %r2,%r4 # %r2 = return length (including \0) -2: mvcp 0(%r1,%r3),0(%r4),%r0 - jnz 3f - br %r14 -3: la %r3,256(%r3) - la %r4,256(%r4) - ahi %r1,-256 - mvcp 0(%r1,%r3),0(%r4),%r0 - jnz 3b - br %r14 -4: sacf 0 - lhi %r2,-EFAULT - br %r14 - .section __ex_table,"a" - .long 0b,4b - .previous - - .align 4 - .text - .globl __strnlen_user_asm - # %r2 = count, %r3 = src -__strnlen_user_asm: - lhi %r0,0 - lr %r1,%r3 - la %r3,0(%r3) # clear high order bit from %r4 - la %r2,0(%r2,%r3) # %r2 points to first byte after string - sacf 256 -0: srst %r2,%r1 - jo 0b - sacf 0 - ahi %r2,1 # strnlen_user result includes the \0 - # or return count+1 if \0 not found - slr %r2,%r3 - br %r14 -2: sacf 0 - slr %r2,%r2 # return 0 on exception - br %r14 - .section __ex_table,"a" - .long 0b,2b - .previous |
