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-rw-r--r--arch/s390/lib/uaccess.c89
1 files changed, 5 insertions, 84 deletions
diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
index 0267405ab7c6..0ffbe1fad72a 100644
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -40,71 +40,10 @@ static inline int copy_with_mvcos(void)
}
#endif
-void set_fs(mm_segment_t fs)
-{
- current->thread.mm_segment = fs;
- if (fs == USER_DS) {
- __ctl_load(S390_lowcore.user_asce, 1, 1);
- clear_cpu_flag(CIF_ASCE_PRIMARY);
- } else {
- __ctl_load(S390_lowcore.kernel_asce, 1, 1);
- set_cpu_flag(CIF_ASCE_PRIMARY);
- }
- if (fs & 1) {
- if (fs == USER_DS_SACF)
- __ctl_load(S390_lowcore.user_asce, 7, 7);
- else
- __ctl_load(S390_lowcore.kernel_asce, 7, 7);
- set_cpu_flag(CIF_ASCE_SECONDARY);
- }
-}
-EXPORT_SYMBOL(set_fs);
-
-mm_segment_t enable_sacf_uaccess(void)
-{
- mm_segment_t old_fs;
- unsigned long asce, cr;
- unsigned long flags;
-
- old_fs = current->thread.mm_segment;
- if (old_fs & 1)
- return old_fs;
- /* protect against a concurrent page table upgrade */
- local_irq_save(flags);
- current->thread.mm_segment |= 1;
- asce = S390_lowcore.kernel_asce;
- if (likely(old_fs == USER_DS)) {
- __ctl_store(cr, 1, 1);
- if (cr != S390_lowcore.kernel_asce) {
- __ctl_load(S390_lowcore.kernel_asce, 1, 1);
- set_cpu_flag(CIF_ASCE_PRIMARY);
- }
- asce = S390_lowcore.user_asce;
- }
- __ctl_store(cr, 7, 7);
- if (cr != asce) {
- __ctl_load(asce, 7, 7);
- set_cpu_flag(CIF_ASCE_SECONDARY);
- }
- local_irq_restore(flags);
- return old_fs;
-}
-EXPORT_SYMBOL(enable_sacf_uaccess);
-
-void disable_sacf_uaccess(mm_segment_t old_fs)
-{
- current->thread.mm_segment = old_fs;
- if (old_fs == USER_DS && test_facility(27)) {
- __ctl_load(S390_lowcore.user_asce, 1, 1);
- clear_cpu_flag(CIF_ASCE_PRIMARY);
- }
-}
-EXPORT_SYMBOL(disable_sacf_uaccess);
-
static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr,
unsigned long size)
{
- register unsigned long reg0 asm("0") = 0x01UL;
+ register unsigned long reg0 asm("0") = 0x81UL;
unsigned long tmp1, tmp2;
tmp1 = -4096UL;
@@ -135,9 +74,7 @@ static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr,
unsigned long size)
{
unsigned long tmp1, tmp2;
- mm_segment_t old_fs;
- old_fs = enable_sacf_uaccess();
tmp1 = -256UL;
asm volatile(
" sacf 0\n"
@@ -164,7 +101,6 @@ static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr,
EX_TABLE(7b,3b) EX_TABLE(8b,3b) EX_TABLE(9b,6b)
: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
- disable_sacf_uaccess(old_fs);
return size;
}
@@ -179,7 +115,7 @@ EXPORT_SYMBOL(raw_copy_from_user);
static inline unsigned long copy_to_user_mvcos(void __user *ptr, const void *x,
unsigned long size)
{
- register unsigned long reg0 asm("0") = 0x010000UL;
+ register unsigned long reg0 asm("0") = 0x810000UL;
unsigned long tmp1, tmp2;
tmp1 = -4096UL;
@@ -210,9 +146,7 @@ static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x,
unsigned long size)
{
unsigned long tmp1, tmp2;
- mm_segment_t old_fs;
- old_fs = enable_sacf_uaccess();
tmp1 = -256UL;
asm volatile(
" sacf 0\n"
@@ -239,7 +173,6 @@ static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x,
EX_TABLE(7b,3b) EX_TABLE(8b,3b) EX_TABLE(9b,6b)
: "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
- disable_sacf_uaccess(old_fs);
return size;
}
@@ -254,7 +187,7 @@ EXPORT_SYMBOL(raw_copy_to_user);
static inline unsigned long copy_in_user_mvcos(void __user *to, const void __user *from,
unsigned long size)
{
- register unsigned long reg0 asm("0") = 0x010001UL;
+ register unsigned long reg0 asm("0") = 0x810081UL;
unsigned long tmp1, tmp2;
tmp1 = -4096UL;
@@ -277,10 +210,8 @@ static inline unsigned long copy_in_user_mvcos(void __user *to, const void __use
static inline unsigned long copy_in_user_mvc(void __user *to, const void __user *from,
unsigned long size)
{
- mm_segment_t old_fs;
unsigned long tmp1;
- old_fs = enable_sacf_uaccess();
asm volatile(
" sacf 256\n"
" aghi %0,-1\n"
@@ -304,7 +235,6 @@ static inline unsigned long copy_in_user_mvc(void __user *to, const void __user
EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
: "+a" (size), "+a" (to), "+a" (from), "=a" (tmp1)
: : "cc", "memory");
- disable_sacf_uaccess(old_fs);
return size;
}
@@ -318,7 +248,7 @@ EXPORT_SYMBOL(raw_copy_in_user);
static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size)
{
- register unsigned long reg0 asm("0") = 0x010000UL;
+ register unsigned long reg0 asm("0") = 0x810000UL;
unsigned long tmp1, tmp2;
tmp1 = -4096UL;
@@ -346,10 +276,8 @@ static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size
static inline unsigned long clear_user_xc(void __user *to, unsigned long size)
{
- mm_segment_t old_fs;
unsigned long tmp1, tmp2;
- old_fs = enable_sacf_uaccess();
asm volatile(
" sacf 256\n"
" aghi %0,-1\n"
@@ -378,7 +306,6 @@ static inline unsigned long clear_user_xc(void __user *to, unsigned long size)
EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
: "+a" (size), "+a" (to), "=a" (tmp1), "=a" (tmp2)
: : "cc", "memory");
- disable_sacf_uaccess(old_fs);
return size;
}
@@ -414,15 +341,9 @@ static inline unsigned long strnlen_user_srst(const char __user *src,
unsigned long __strnlen_user(const char __user *src, unsigned long size)
{
- mm_segment_t old_fs;
- unsigned long len;
-
if (unlikely(!size))
return 0;
- old_fs = enable_sacf_uaccess();
- len = strnlen_user_srst(src, size);
- disable_sacf_uaccess(old_fs);
- return len;
+ return strnlen_user_srst(src, size);
}
EXPORT_SYMBOL(__strnlen_user);
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-04 04:37:01 +0000