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Diffstat (limited to 'arch/s390/include/asm')
-rw-r--r--arch/s390/include/asm/futex.h9
-rw-r--r--arch/s390/include/asm/lowcore.h33
-rw-r--r--arch/s390/include/asm/mmu_context.h36
-rw-r--r--arch/s390/include/asm/processor.h4
-rw-r--r--arch/s390/include/asm/uaccess.h29
5 files changed, 46 insertions, 65 deletions
diff --git a/arch/s390/include/asm/futex.h b/arch/s390/include/asm/futex.h
index 9b5a3469fed9..5e97a4353147 100644
--- a/arch/s390/include/asm/futex.h
+++ b/arch/s390/include/asm/futex.h
@@ -26,9 +26,9 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
u32 __user *uaddr)
{
int oldval = 0, newval, ret;
+ mm_segment_t old_fs;
- load_kernel_asce();
-
+ old_fs = enable_sacf_uaccess();
pagefault_disable();
switch (op) {
case FUTEX_OP_SET:
@@ -55,6 +55,7 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
ret = -ENOSYS;
}
pagefault_enable();
+ disable_sacf_uaccess(old_fs);
if (!ret)
*oval = oldval;
@@ -65,9 +66,10 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
+ mm_segment_t old_fs;
int ret;
- load_kernel_asce();
+ old_fs = enable_sacf_uaccess();
asm volatile(
" sacf 256\n"
"0: cs %1,%4,0(%5)\n"
@@ -77,6 +79,7 @@ static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
: "cc", "memory");
+ disable_sacf_uaccess(old_fs);
*uval = oldval;
return ret;
}
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index 9eb36a1592c7..2306fa17f6cd 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -115,33 +115,28 @@ struct lowcore {
/* Address space pointer. */
__u64 kernel_asce; /* 0x0378 */
__u64 user_asce; /* 0x0380 */
+ __u64 vdso_asce; /* 0x0388 */
/*
* The lpp and current_pid fields form a
* 64-bit value that is set as program
* parameter with the LPP instruction.
*/
- __u32 lpp; /* 0x0388 */
- __u32 current_pid; /* 0x038c */
+ __u32 lpp; /* 0x0390 */
+ __u32 current_pid; /* 0x0394 */
/* SMP info area */
- __u32 cpu_nr; /* 0x0390 */
- __u32 softirq_pending; /* 0x0394 */
- __u64 percpu_offset; /* 0x0398 */
- __u64 vdso_per_cpu_data; /* 0x03a0 */
- __u64 machine_flags; /* 0x03a8 */
- __u32 preempt_count; /* 0x03b0 */
- __u8 pad_0x03b4[0x03b8-0x03b4]; /* 0x03b4 */
- __u64 gmap; /* 0x03b8 */
- __u32 spinlock_lockval; /* 0x03c0 */
- __u32 spinlock_index; /* 0x03c4 */
- __u32 fpu_flags; /* 0x03c8 */
- __u8 pad_0x03cc[0x0400-0x03cc]; /* 0x03cc */
-
- /* Per cpu primary space access list */
- __u32 paste[16]; /* 0x0400 */
-
- __u8 pad_0x04c0[0x0e00-0x0440]; /* 0x0440 */
+ __u32 cpu_nr; /* 0x0398 */
+ __u32 softirq_pending; /* 0x039c */
+ __u32 preempt_count; /* 0x03a0 */
+ __u32 spinlock_lockval; /* 0x03a4 */
+ __u32 spinlock_index; /* 0x03a8 */
+ __u32 fpu_flags; /* 0x03ac */
+ __u64 percpu_offset; /* 0x03b0 */
+ __u64 vdso_per_cpu_data; /* 0x03b8 */
+ __u64 machine_flags; /* 0x03c0 */
+ __u64 gmap; /* 0x03c8 */
+ __u8 pad_0x03d0[0x0e00-0x03d0]; /* 0x03d0 */
/*
* 0xe00 contains the address of the IPL Parameter Information
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 43607bb12cc2..6133aa376b7c 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -71,41 +71,38 @@ static inline int init_new_context(struct task_struct *tsk,
static inline void set_user_asce(struct mm_struct *mm)
{
S390_lowcore.user_asce = mm->context.asce;
- if (current->thread.mm_segment.ar4)
- __ctl_load(S390_lowcore.user_asce, 7, 7);
- set_cpu_flag(CIF_ASCE_PRIMARY);
+ __ctl_load(S390_lowcore.user_asce, 1, 1);
+ clear_cpu_flag(CIF_ASCE_PRIMARY);
}
static inline void clear_user_asce(void)
{
S390_lowcore.user_asce = S390_lowcore.kernel_asce;
-
- __ctl_load(S390_lowcore.user_asce, 1, 1);
- __ctl_load(S390_lowcore.user_asce, 7, 7);
-}
-
-static inline void load_kernel_asce(void)
-{
- unsigned long asce;
-
- __ctl_store(asce, 1, 1);
- if (asce != S390_lowcore.kernel_asce)
- __ctl_load(S390_lowcore.kernel_asce, 1, 1);
+ __ctl_load(S390_lowcore.kernel_asce, 1, 1);
set_cpu_flag(CIF_ASCE_PRIMARY);
}
+mm_segment_t enable_sacf_uaccess(void);
+void disable_sacf_uaccess(mm_segment_t old_fs);
+
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
int cpu = smp_processor_id();
- S390_lowcore.user_asce = next->context.asce;
if (prev == next)
return;
+ S390_lowcore.user_asce = next->context.asce;
cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
- /* Clear old ASCE by loading the kernel ASCE. */
- __ctl_load(S390_lowcore.kernel_asce, 1, 1);
- __ctl_load(S390_lowcore.kernel_asce, 7, 7);
+ /* Clear previous user-ASCE from CR1 and CR7 */
+ if (!test_cpu_flag(CIF_ASCE_PRIMARY)) {
+ __ctl_load(S390_lowcore.kernel_asce, 1, 1);
+ set_cpu_flag(CIF_ASCE_PRIMARY);
+ }
+ if (test_cpu_flag(CIF_ASCE_SECONDARY)) {
+ __ctl_load(S390_lowcore.vdso_asce, 7, 7);
+ clear_cpu_flag(CIF_ASCE_SECONDARY);
+ }
cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
}
@@ -115,7 +112,6 @@ static inline void finish_arch_post_lock_switch(void)
struct task_struct *tsk = current;
struct mm_struct *mm = tsk->mm;
- load_kernel_asce();
if (mm) {
preempt_disable();
while (atomic_read(&mm->context.flush_count))
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index f25bfe888933..709351bce80e 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -109,9 +109,7 @@ extern void execve_tail(void);
#define HAVE_ARCH_PICK_MMAP_LAYOUT
-typedef struct {
- __u32 ar4;
-} mm_segment_t;
+typedef unsigned int mm_segment_t;
/*
* Thread structure
diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index cdd0f0d999e2..ad6b91013a05 100644
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -16,7 +16,7 @@
#include <asm/processor.h>
#include <asm/ctl_reg.h>
#include <asm/extable.h>
-
+#include <asm/facility.h>
/*
* The fs value determines whether argument validity checking should be
@@ -26,27 +26,16 @@
* For historical reasons, these macros are grossly misnamed.
*/
-#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) })
-
-
-#define KERNEL_DS MAKE_MM_SEG(0)
-#define USER_DS MAKE_MM_SEG(1)
+#define KERNEL_DS (0)
+#define KERNEL_DS_SACF (1)
+#define USER_DS (2)
+#define USER_DS_SACF (3)
#define get_ds() (KERNEL_DS)
#define get_fs() (current->thread.mm_segment)
-#define segment_eq(a,b) ((a).ar4 == (b).ar4)
+#define segment_eq(a,b) (((a) & 2) == ((b) & 2))
-static inline void set_fs(mm_segment_t fs)
-{
- current->thread.mm_segment = fs;
- if (uaccess_kernel()) {
- set_cpu_flag(CIF_ASCE_SECONDARY);
- __ctl_load(S390_lowcore.kernel_asce, 7, 7);
- } else {
- clear_cpu_flag(CIF_ASCE_SECONDARY);
- __ctl_load(S390_lowcore.user_asce, 7, 7);
- }
-}
+void set_fs(mm_segment_t fs);
static inline int __range_ok(unsigned long addr, unsigned long size)
{
@@ -95,7 +84,7 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n);
static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
{
- unsigned long spec = 0x810000UL;
+ unsigned long spec = 0x010000UL;
int rc;
switch (size) {
@@ -125,7 +114,7 @@ static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
{
- unsigned long spec = 0x81UL;
+ unsigned long spec = 0x01UL;
int rc;
switch (size) {
generated by cgit (git 2.34.1) at 2024-05-17 17:33:55 +0000