diff options
Diffstat (limited to 'arch/s390/lib/uaccess64.S')
| -rw-r--r-- | arch/s390/lib/uaccess64.S | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/arch/s390/lib/uaccess64.S b/arch/s390/lib/uaccess64.S deleted file mode 100644 index 1f755be..0000000 --- a/arch/s390/lib/uaccess64.S +++ /dev/null @@ -1,207 +0,0 @@ -/* - * arch/s390x/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: - slgr %r0,%r0 -0: mvcp 0(%r3,%r2),0(%r4),%r0 - jnz 1f - slgr %r2,%r2 - br %r14 -1: la %r2,256(%r2) - la %r4,256(%r4) - aghi %r3,-256 -2: mvcp 0(%r3,%r2),0(%r4),%r0 - jnz 1b -3: slgr %r2,%r2 - br %r14 -4: lghi %r0,-4096 - lgr %r5,%r4 - slgr %r5,%r0 - ngr %r5,%r0 # %r5 = (%r4 + 4096) & -4096 - slgr %r5,%r4 # %r5 = #bytes to next user page boundary - clgr %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 - slgr %r3,%r5 -6: lgr %r2,%r3 - br %r14 - .section __ex_table,"a" - .quad 0b,4b - .quad 2b,4b - .quad 5b,6b - .previous - - .align 4 - .text - .globl __copy_to_user_asm - # %r2 = from, %r3 = n, %r4 = to -__copy_to_user_asm: - slgr %r0,%r0 -0: mvcs 0(%r3,%r4),0(%r2),%r0 - jnz 1f - slgr %r2,%r2 - br %r14 -1: la %r2,256(%r2) - la %r4,256(%r4) - aghi %r3,-256 -2: mvcs 0(%r3,%r4),0(%r2),%r0 - jnz 1b -3: slgr %r2,%r2 - br %r14 -4: lghi %r0,-4096 - lgr %r5,%r4 - slgr %r5,%r0 - ngr %r5,%r0 # %r5 = (%r4 + 4096) & -4096 - slgr %r5,%r4 # %r5 = #bytes to next user page boundary - clgr %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 - slgr %r3,%r5 -6: lgr %r2,%r3 - br %r14 - .section __ex_table,"a" - .quad 0b,4b - .quad 2b,4b - .quad 5b,6b - .previous - - .align 4 - .text - .globl __copy_in_user_asm - # %r2 = from, %r3 = n, %r4 = to -__copy_in_user_asm: - aghi %r3,-1 - jo 6f - sacf 256 - bras %r1,4f -0: aghi %r3,257 -1: mvc 0(1,%r4),0(%r2) - la %r2,1(%r2) - la %r4,1(%r4) - aghi %r3,-1 - jnz 1b -2: lgr %r2,%r3 - br %r14 -3: mvc 0(256,%r4),0(%r2) - la %r2,256(%r2) - la %r4,256(%r4) -4: aghi %r3,-256 - jnm 3b -5: ex %r3,4(%r1) - sacf 0 -6: slgr %r2,%r2 - br 14 - .section __ex_table,"a" - .quad 1b,2b - .quad 3b,0b - .quad 5b,0b - .previous - - .align 4 - .text - .globl __clear_user_asm - # %r2 = to, %r3 = n -__clear_user_asm: - slgr %r0,%r0 - larl %r5,empty_zero_page -1: mvcs 0(%r3,%r2),0(%r5),%r0 - jnz 2f - slgr %r2,%r2 - br %r14 -2: la %r2,256(%r2) - aghi %r3,-256 -3: mvcs 0(%r3,%r2),0(%r5),%r0 - jnz 2b -4: slgr %r2,%r2 - br %r14 -5: lghi %r0,-4096 - lgr %r4,%r2 - slgr %r4,%r0 - ngr %r4,%r0 # %r4 = (%r2 + 4096) & -4096 - slgr %r4,%r2 # %r4 = #bytes to next user page boundary - clgr %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 - slgr %r3,%r4 -7: lgr %r2,%r3 - br %r14 - .section __ex_table,"a" - .quad 1b,5b - .quad 3b,5b - .quad 6b,7b - .previous - - .align 4 - .text - .globl __strncpy_from_user_asm - # %r2 = count, %r3 = dst, %r4 = src -__strncpy_from_user_asm: - lghi %r0,0 - lgr %r1,%r4 - la %r2,0(%r2,%r4) # %r2 points to first byte after string - sacf 256 -0: srst %r2,%r1 - jo 0b - sacf 0 - lgr %r1,%r2 - jh 1f # \0 found in string ? - aghi %r1,1 # include \0 in copy -1: slgr %r1,%r4 # %r1 = copy length (without \0) - slgr %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) - aghi %r1,-256 - mvcp 0(%r1,%r3),0(%r4),%r0 - jnz 3b - br %r14 -4: sacf 0 - lghi %r2,-EFAULT - br %r14 - .section __ex_table,"a" - .quad 0b,4b - .previous - - .align 4 - .text - .globl __strnlen_user_asm - # %r2 = count, %r3 = src -__strnlen_user_asm: - lghi %r0,0 - lgr %r1,%r3 - la %r2,0(%r2,%r3) # %r2 points to first byte after string - sacf 256 -0: srst %r2,%r1 - jo 0b - sacf 0 - aghi %r2,1 # strnlen_user result includes the \0 - # or return count+1 if \0 not found - slgr %r2,%r3 - br %r14 -2: sacf 0 - slgr %r2,%r2 # return 0 on exception - br %r14 - .section __ex_table,"a" - .quad 0b,2b - .previous |
