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[S390] Make user-copy operations run-time configurable.

Browse source 
Introduces a struct uaccess_ops which allows setting user-copy
operations at run-time.

Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer 2006-09-20 15:59:42 +02:00 committed by Martin Schwidefsky
parent 6837a8c352
commit d02765d1af
8 changed files with 411 additions and 621 deletions
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6
arch/s390/kernel/s390_ksyms.c
View file

@ -25,12 +25,6 @@ EXPORT_SYMBOL(_oi_bitmap);
EXPORT_SYMBOL(_ni_bitmap);
EXPORT_SYMBOL(_zb_findmap);
EXPORT_SYMBOL(_sb_findmap);
EXPORT_SYMBOL(__copy_from_user_asm);
EXPORT_SYMBOL(__copy_to_user_asm);
EXPORT_SYMBOL(__copy_in_user_asm);
EXPORT_SYMBOL(__clear_user_asm);
EXPORT_SYMBOL(__strncpy_from_user_asm);
EXPORT_SYMBOL(__strnlen_user_asm);
EXPORT_SYMBOL(diag10);
/*

7
arch/s390/kernel/setup.c
View file

@ -50,6 +50,12 @@
#include <asm/ptrace.h>
#include <asm/sections.h>
/*
* User copy operations.
*/
struct uaccess_ops uaccess;
EXPORT_SYMBOL_GPL(uaccess);
/*
* Machine setup..
*/
@ -641,6 +647,7 @@ setup_arch(char **cmdline_p)
memory_end = memory_size;
memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
parse_early_param();
#ifndef CONFIG_64BIT

3
arch/s390/lib/Makefile
View file

@ -4,6 +4,5 @@
EXTRA_AFLAGS := -traditional
lib-y += delay.o string.o
lib-y += $(if $(CONFIG_64BIT),uaccess64.o,uaccess.o)
lib-y += delay.o string.o uaccess_std.o
lib-$(CONFIG_SMP) += spinlock.o

211
arch/s390/lib/uaccess.S
View file

@ -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

207
arch/s390/lib/uaccess64.S
View file

@ -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

340
arch/s390/lib/uaccess_std.c Normal file
View file

@ -0,0 +1,340 @@
/*
* arch/s390/lib/uaccess_std.c
*
* Standard user space access functions based on mvcp/mvcs and doing
* interesting things in the secondary space mode.
*
* Copyright (C) IBM Corp. 2006
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Gerald Schaefer (gerald.schaefer@de.ibm.com)
*/
#include <linux/errno.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include <asm/futex.h>
#ifndef __s390x__
#define AHI "ahi"
#define ALR "alr"
#define CLR "clr"
#define LHI "lhi"
#define SLR "slr"
#else
#define AHI "aghi"
#define ALR "algr"
#define CLR "clgr"
#define LHI "lghi"
#define SLR "slgr"
#endif
size_t copy_from_user_std(size_t size, const void __user *ptr, void *x)
{
unsigned long tmp1, tmp2;
tmp1 = -256UL;
asm volatile(
"0: mvcp 0(%0,%2),0(%1),%3\n"
" jz 5f\n"
"1:"ALR" %0,%3\n"
" la %1,256(%1)\n"
" la %2,256(%2)\n"
"2: mvcp 0(%0,%2),0(%1),%3\n"
" jnz 1b\n"
" j 5f\n"
"3: la %4,255(%1)\n" /* %4 = ptr + 255 */
" "LHI" %3,-4096\n"
" nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */
" "SLR" %4,%1\n"
" "CLR" %0,%4\n" /* copy crosses next page boundary? */
" jnh 6f\n"
"4: mvcp 0(%4,%2),0(%1),%3\n"
" "SLR" %0,%4\n"
" j 6f\n"
"5:"SLR" %0,%0\n"
"6: \n"
EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b)
: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
return size;
}
size_t copy_from_user_std_small(size_t size, const void __user *ptr, void *x)
{
unsigned long tmp1, tmp2;
tmp1 = 0UL;
asm volatile(
"0: mvcp 0(%0,%2),0(%1),%3\n"
" "SLR" %0,%0\n"
" j 3f\n"
"1: la %4,255(%1)\n" /* %4 = ptr + 255 */
" "LHI" %3,-4096\n"
" nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */
" "SLR" %4,%1\n"
" "CLR" %0,%4\n" /* copy crosses next page boundary? */
" jnh 3f\n"
"2: mvcp 0(%4,%2),0(%1),%3\n"
" "SLR" %0,%4\n"
"3:\n"
EX_TABLE(0b,1b) EX_TABLE(2b,3b)
: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
return size;
}
size_t copy_to_user_std(size_t size, void __user *ptr, const void *x)
{
unsigned long tmp1, tmp2;
tmp1 = -256UL;
asm volatile(
"0: mvcs 0(%0,%1),0(%2),%3\n"
" jz 5f\n"
"1:"ALR" %0,%3\n"
" la %1,256(%1)\n"
" la %2,256(%2)\n"
"2: mvcs 0(%0,%1),0(%2),%3\n"
" jnz 1b\n"
" j 5f\n"
"3: la %4,255(%1)\n" /* %4 = ptr + 255 */
" "LHI" %3,-4096\n"
" nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */
" "SLR" %4,%1\n"
" "CLR" %0,%4\n" /* copy crosses next page boundary? */
" jnh 6f\n"
"4: mvcs 0(%4,%1),0(%2),%3\n"
" "SLR" %0,%4\n"
" j 6f\n"
"5:"SLR" %0,%0\n"
"6: \n"
EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b)
: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
return size;
}
size_t copy_to_user_std_small(size_t size, void __user *ptr, const void *x)
{
unsigned long tmp1, tmp2;
tmp1 = 0UL;
asm volatile(
"0: mvcs 0(%0,%1),0(%2),%3\n"
" "SLR" %0,%0\n"
" j 3f\n"
"1: la %4,255(%1)\n" /* ptr + 255 */
" "LHI" %3,-4096\n"
" nr %4,%3\n" /* (ptr + 255) & -4096UL */
" "SLR" %4,%1\n"
" "CLR" %0,%4\n" /* copy crosses next page boundary? */
" jnh 3f\n"
"2: mvcs 0(%4,%1),0(%2),%3\n"
" "SLR" %0,%4\n"
"3:\n"
EX_TABLE(0b,1b) EX_TABLE(2b,3b)
: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
return size;
}
size_t copy_in_user_std(size_t size, void __user *to, const void __user *from)
{
unsigned long tmp1;
asm volatile(
" "AHI" %0,-1\n"
" jo 5f\n"
" sacf 256\n"
" bras %3,3f\n"
"0:"AHI" %0,257\n"
"1: mvc 0(1,%1),0(%2)\n"
" la %1,1(%1)\n"
" la %2,1(%2)\n"
" "AHI" %0,-1\n"
" jnz 1b\n"
" j 5f\n"
"2: mvc 0(256,%1),0(%2)\n"
" la %1,256(%1)\n"
" la %2,256(%2)\n"
"3:"AHI" %0,-256\n"
" jnm 2b\n"
"4: ex %0,1b-0b(%3)\n"
" sacf 0\n"
"5: "SLR" %0,%0\n"
"6:\n"
EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
: "+a" (size), "+a" (to), "+a" (from), "=a" (tmp1)
: : "cc", "memory");
return size;
}
size_t clear_user_std(size_t size, void __user *to)
{
unsigned long tmp1, tmp2;
asm volatile(
" "AHI" %0,-1\n"
" jo 5f\n"
" sacf 256\n"
" bras %3,3f\n"
" xc 0(1,%1),0(%1)\n"
"0:"AHI" %0,257\n"
" la %2,255(%1)\n" /* %2 = ptr + 255 */
" srl %2,12\n"
" sll %2,12\n" /* %2 = (ptr + 255) & -4096 */
" "SLR" %2,%1\n"
" "CLR" %0,%2\n" /* clear crosses next page boundary? */
" jnh 5f\n"
" "AHI" %2,-1\n"
"1: ex %2,0(%3)\n"
" "AHI" %2,1\n"
" "SLR" %0,%2\n"
" j 5f\n"
"2: xc 0(256,%1),0(%1)\n"
" la %1,256(%1)\n"
"3:"AHI" %0,-256\n"
" jnm 2b\n"
"4: ex %0,0(%3)\n"
" sacf 0\n"
"5: "SLR" %0,%0\n"
"6:\n"
EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
: "+a" (size), "+a" (to), "=a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
return size;
}
size_t strnlen_user_std(size_t size, const char __user *src)
{
register unsigned long reg0 asm("0") = 0UL;
unsigned long tmp1, tmp2;
asm volatile(
" la %2,0(%1)\n"
" la %3,0(%0,%1)\n"
" "SLR" %0,%0\n"
" sacf 256\n"
"0: srst %3,%2\n"
" jo 0b\n"
" la %0,1(%3)\n" /* strnlen_user results includes \0 */
" "SLR" %0,%1\n"
"1: sacf 0\n"
EX_TABLE(0b,1b)
: "+a" (size), "+a" (src), "=a" (tmp1), "=a" (tmp2)
: "d" (reg0) : "cc", "memory");
return size;
}
size_t strncpy_from_user_std(size_t size, const char __user *src, char *dst)
{
register unsigned long reg0 asm("0") = 0UL;
unsigned long tmp1, tmp2;
asm volatile(
" la %3,0(%1)\n"
" la %4,0(%0,%1)\n"
" sacf 256\n"
"0: srst %4,%3\n"
" jo 0b\n"
" sacf 0\n"
" la %0,0(%4)\n"
" jh 1f\n" /* found \0 in string ? */
" "AHI" %4,1\n" /* include \0 in copy */
"1:"SLR" %0,%1\n" /* %0 = return length (without \0) */
" "SLR" %4,%1\n" /* %4 = copy length (including \0) */
"2: mvcp 0(%4,%2),0(%1),%5\n"
" jz 9f\n"
"3:"AHI" %4,-256\n"
" la %1,256(%1)\n"
" la %2,256(%2)\n"
"4: mvcp 0(%4,%2),0(%1),%5\n"
" jnz 3b\n"
" j 9f\n"
"7: sacf 0\n"
"8:"LHI" %0,%6\n"
"9:\n"
EX_TABLE(0b,7b) EX_TABLE(2b,8b) EX_TABLE(4b,8b)
: "+a" (size), "+a" (src), "+d" (dst), "=a" (tmp1), "=a" (tmp2)
: "d" (reg0), "K" (-EFAULT) : "cc", "memory");
return size;
}
#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
asm volatile( \
" sacf 256\n" \
"0: l %1,0(%6)\n" \
"1:"insn \
"2: cs %1,%2,0(%6)\n" \
"3: jl 1b\n" \
" lhi %0,0\n" \
"4: sacf 0\n" \
EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \
: "=d" (ret), "=&d" (oldval), "=&d" (newval), \
"=m" (*uaddr) \
: "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
"m" (*uaddr) : "cc");
int futex_atomic_op(int op, int __user *uaddr, int oparg, int *old)
{
int oldval = 0, newval, ret;
inc_preempt_count();
switch (op) {
case FUTEX_OP_SET:
__futex_atomic_op("lr %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
case FUTEX_OP_ADD:
__futex_atomic_op("lr %2,%1\nar %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
case FUTEX_OP_OR:
__futex_atomic_op("lr %2,%1\nor %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
case FUTEX_OP_ANDN:
__futex_atomic_op("lr %2,%1\nnr %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
case FUTEX_OP_XOR:
__futex_atomic_op("lr %2,%1\nxr %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
default:
ret = -ENOSYS;
}
dec_preempt_count();
*old = oldval;
return ret;
}
int futex_atomic_cmpxchg(int __user *uaddr, int oldval, int newval)
{
int ret;
asm volatile(
" sacf 256\n"
" cs %1,%4,0(%5)\n"
"0: lr %0,%1\n"
"1: sacf 0\n"
EX_TABLE(0b,1b)
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
: "cc", "memory" );
return ret;
}
struct uaccess_ops uaccess_std = {
.copy_from_user = copy_from_user_std,
.copy_from_user_small = copy_from_user_std_small,
.copy_to_user = copy_to_user_std,
.copy_to_user_small = copy_to_user_std_small,
.copy_in_user = copy_in_user_std,
.clear_user = clear_user_std,
.strnlen_user = strnlen_user_std,
.strncpy_from_user = strncpy_from_user_std,
.futex_atomic_op = futex_atomic_op,
.futex_atomic_cmpxchg = futex_atomic_cmpxchg,
};

87
include/asm-s390/futex.h
View file

@ -7,75 +7,21 @@
#include <asm/errno.h>
#include <asm/uaccess.h>
#ifndef __s390x__
#define __futex_atomic_fixup \
".section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 0b,4b,2b,4b,3b,4b\n" \
".previous"
#else /* __s390x__ */
#define __futex_atomic_fixup \
".section __ex_table,\"a\"\n" \
" .align 8\n" \
" .quad 0b,4b,2b,4b,3b,4b\n" \
".previous"
#endif /* __s390x__ */
#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
asm volatile(" sacf 256\n" \
"0: l %1,0(%6)\n" \
"1: " insn \
"2: cs %1,%2,0(%6)\n" \
"3: jl 1b\n" \
" lhi %0,0\n" \
"4: sacf 0\n" \
__futex_atomic_fixup \
: "=d" (ret), "=&d" (oldval), "=&d" (newval), \
"=m" (*uaddr) \
: "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
"m" (*uaddr) : "cc" );
static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
{
int op = (encoded_op >> 28) & 7;
int cmp = (encoded_op >> 24) & 15;
int oparg = (encoded_op << 8) >> 20;
int cmparg = (encoded_op << 20) >> 20;
int oldval = 0, newval, ret;
int oldval, ret;
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
return -EFAULT;
inc_preempt_count();
switch (op) {
case FUTEX_OP_SET:
__futex_atomic_op("lr %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
case FUTEX_OP_ADD:
__futex_atomic_op("lr %2,%1\nar %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
case FUTEX_OP_OR:
__futex_atomic_op("lr %2,%1\nor %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
case FUTEX_OP_ANDN:
__futex_atomic_op("lr %2,%1\nnr %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
case FUTEX_OP_XOR:
__futex_atomic_op("lr %2,%1\nxr %2,%5\n",
ret, oldval, newval, uaddr, oparg);
break;
default:
ret = -ENOSYS;
}
dec_preempt_count();
ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval);
if (!ret) {
switch (cmp) {
@ -91,32 +37,13 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
return ret;
}
static inline int
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr,
int oldval, int newval)
{
int ret;
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
return -EFAULT;
asm volatile(" sacf 256\n"
" cs %1,%4,0(%5)\n"
"0: lr %0,%1\n"
"1: sacf 0\n"
#ifndef __s390x__
".section __ex_table,\"a\"\n"
" .align 4\n"
" .long 0b,1b\n"
".previous"
#else /* __s390x__ */
".section __ex_table,\"a\"\n"
" .align 8\n"
" .quad 0b,1b\n"
".previous"
#endif /* __s390x__ */
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
: "cc", "memory" );
return oldval;
return uaccess.futex_atomic_cmpxchg(uaddr, oldval, newval);
}
#endif /* __KERNEL__ */

171
include/asm-s390/uaccess.h
View file

@ -47,7 +47,7 @@
S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
asm volatile ("lctlg 7,7,%0" : : "m" (__pto) ); \
})
#else
#else /* __s390x__ */
#define set_fs(x) \
({ \
unsigned long __pto; \
@ -56,7 +56,7 @@
S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
asm volatile ("lctl 7,7,%0" : : "m" (__pto) ); \
})
#endif
#endif /* __s390x__ */
#define segment_eq(a,b) ((a).ar4 == (b).ar4)
@ -85,76 +85,50 @@ struct exception_table_entry
unsigned long insn, fixup;
};
#ifndef __s390x__
#define __uaccess_fixup \
".section .fixup,\"ax\"\n" \
"2: lhi %0,%4\n" \
" bras 1,3f\n" \
" .long 1b\n" \
"3: l 1,0(1)\n" \
" br 1\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 0b,2b\n" \
".previous"
#define __uaccess_clobber "cc", "1"
#else /* __s390x__ */
#define __uaccess_fixup \
".section .fixup,\"ax\"\n" \
"2: lghi %0,%4\n" \
" jg 1b\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 8\n" \
" .quad 0b,2b\n" \
".previous"
#define __uaccess_clobber "cc"
#endif /* __s390x__ */
struct uaccess_ops {
size_t (*copy_from_user)(size_t, const void __user *, void *);
size_t (*copy_from_user_small)(size_t, const void __user *, void *);
size_t (*copy_to_user)(size_t, void __user *, const void *);
size_t (*copy_to_user_small)(size_t, void __user *, const void *);
size_t (*copy_in_user)(size_t, void __user *, const void __user *);
size_t (*clear_user)(size_t, void __user *);
size_t (*strnlen_user)(size_t, const char __user *);
size_t (*strncpy_from_user)(size_t, const char __user *, char *);
int (*futex_atomic_op)(int op, int __user *, int oparg, int *old);
int (*futex_atomic_cmpxchg)(int __user *, int old, int new);
};
extern struct uaccess_ops uaccess;
extern struct uaccess_ops uaccess_std;
static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
{
size = uaccess.copy_to_user_small(size, ptr, x);
return size ? -EFAULT : size;
}
static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
{
size = uaccess.copy_from_user_small(size, ptr, x);
return size ? -EFAULT : size;
}
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*/
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
#define __put_user_asm(x, ptr, err) \
({ \
err = 0; \
asm volatile( \
"0: mvcs 0(%1,%2),%3,%0\n" \
"1:\n" \
__uaccess_fixup \
: "+&d" (err) \
: "d" (sizeof(*(ptr))), "a" (ptr), "Q" (x), \
"K" (-EFAULT) \
: __uaccess_clobber ); \
})
#else
#define __put_user_asm(x, ptr, err) \
({ \
err = 0; \
asm volatile( \
"0: mvcs 0(%1,%2),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
: "+&d" (err) \
: "d" (sizeof(*(ptr))), "a" (ptr), "a" (&(x)), \
"K" (-EFAULT), "m" (x) \
: __uaccess_clobber ); \
})
#endif
#define __put_user(x, ptr) \
({ \
__typeof__(*(ptr)) __x = (x); \
int __pu_err; \
int __pu_err = -EFAULT; \
__chk_user_ptr(ptr); \
switch (sizeof (*(ptr))) { \
case 1: \
case 2: \
case 4: \
case 8: \
__put_user_asm(__x, ptr, __pu_err); \
__pu_err = __put_user_fn(sizeof (*(ptr)), \
ptr, &__x); \
break; \
default: \
__put_user_bad(); \
@ -172,60 +146,36 @@ struct exception_table_entry
extern int __put_user_bad(void) __attribute__((noreturn));
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
#define __get_user_asm(x, ptr, err) \
({ \
err = 0; \
asm volatile ( \
"0: mvcp %O1(%2,%R1),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
: "+&d" (err), "=Q" (x) \
: "d" (sizeof(*(ptr))), "a" (ptr), \
"K" (-EFAULT) \
: __uaccess_clobber ); \
})
#else
#define __get_user_asm(x, ptr, err) \
({ \
err = 0; \
asm volatile ( \
"0: mvcp 0(%2,%5),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
: "+&d" (err), "=m" (x) \
: "d" (sizeof(*(ptr))), "a" (ptr), \
"K" (-EFAULT), "a" (&(x)) \
: __uaccess_clobber ); \
})
#endif
#define __get_user(x, ptr) \
({ \
int __gu_err; \
__chk_user_ptr(ptr); \
int __gu_err = -EFAULT; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: { \
unsigned char __x; \
__get_user_asm(__x, ptr, __gu_err); \
__gu_err = __get_user_fn(sizeof (*(ptr)), \
ptr, &__x); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 2: { \
unsigned short __x; \
__get_user_asm(__x, ptr, __gu_err); \
__gu_err = __get_user_fn(sizeof (*(ptr)), \
ptr, &__x); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 4: { \
unsigned int __x; \
__get_user_asm(__x, ptr, __gu_err); \
__gu_err = __get_user_fn(sizeof (*(ptr)), \
ptr, &__x); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 8: { \
unsigned long long __x; \
__get_user_asm(__x, ptr, __gu_err); \
__gu_err = __get_user_fn(sizeof (*(ptr)), \
ptr, &__x); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
@ -247,8 +197,6 @@ extern int __get_user_bad(void) __attribute__((noreturn));
#define __put_user_unaligned __put_user
#define __get_user_unaligned __get_user
extern long __copy_to_user_asm(const void *from, long n, void __user *to);
/**
* __copy_to_user: - Copy a block of data into user space, with less checking.
* @to: Destination address, in user space.
@ -266,7 +214,10 @@ extern long __copy_to_user_asm(const void *from, long n, void __user *to);
static inline unsigned long
__copy_to_user(void __user *to, const void *from, unsigned long n)
{
return __copy_to_user_asm(from, n, to);
if (__builtin_constant_p(n) && (n <= 256))
return uaccess.copy_to_user_small(n, to, from);
else
return uaccess.copy_to_user(n, to, from);
}
#define __copy_to_user_inatomic __copy_to_user
@ -294,8 +245,6 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
return n;
}
extern long __copy_from_user_asm(void *to, long n, const void __user *from);
/**
* __copy_from_user: - Copy a block of data from user space, with less checking.
* @to: Destination address, in kernel space.
@ -316,7 +265,10 @@ extern long __copy_from_user_asm(void *to, long n, const void __user *from);
static inline unsigned long
__copy_from_user(void *to, const void __user *from, unsigned long n)
{
return __copy_from_user_asm(to, n, from);
if (__builtin_constant_p(n) && (n <= 256))
return uaccess.copy_from_user_small(n, from, to);
else
return uaccess.copy_from_user(n, from, to);
}
/**
@ -346,13 +298,10 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
return n;
}
extern unsigned long __copy_in_user_asm(const void __user *from, long n,
void __user *to);
static inline unsigned long
__copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
return __copy_in_user_asm(from, n, to);
return uaccess.copy_in_user(n, to, from);
}
static inline unsigned long
@ -360,34 +309,28 @@ copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
might_sleep();
if (__access_ok(from,n) && __access_ok(to,n))
n = __copy_in_user_asm(from, n, to);
n = __copy_in_user(to, from, n);
return n;
}
/*
* Copy a null terminated string from userspace.
*/
extern long __strncpy_from_user_asm(long count, char *dst,
const char __user *src);
static inline long
strncpy_from_user(char *dst, const char __user *src, long count)
{
long res = -EFAULT;
might_sleep();
if (access_ok(VERIFY_READ, src, 1))
res = __strncpy_from_user_asm(count, dst, src);
res = uaccess.strncpy_from_user(count, src, dst);
return res;
}
extern long __strnlen_user_asm(long count, const char __user *src);
static inline unsigned long
strnlen_user(const char __user * src, unsigned long n)
{
might_sleep();
return __strnlen_user_asm(n, src);
return uaccess.strnlen_user(n, src);
}
/**
@ -410,12 +353,10 @@ strnlen_user(const char __user * src, unsigned long n)
* Zero Userspace
*/
extern long __clear_user_asm(void __user *to, long n);
static inline unsigned long
__clear_user(void __user *to, unsigned long n)
{
return __clear_user_asm(to, n);
return uaccess.clear_user(n, to);
}
static inline unsigned long
@ -423,7 +364,7 @@ clear_user(void __user *to, unsigned long n)
{
might_sleep();
if (access_ok(VERIFY_WRITE, to, n))
n = __clear_user_asm(to, n);
n = uaccess.clear_user(n, to);
return n;
}