#ifndef _ASM_S390_FUTEX_H
#define _ASM_S390_FUTEX_H
-#include <linux/futex.h>
#include <linux/uaccess.h>
+#include <linux/futex.h>
+#include <asm/mmu_context.h>
#include <asm/errno.h>
-int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval);
-int __futex_atomic_op_inuser(int op, u32 __user *uaddr, int oparg, int *old);
+#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 768\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");
static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
{
int cmp = (encoded_op >> 24) & 15;
int oparg = (encoded_op << 8) >> 20;
int cmparg = (encoded_op << 20) >> 20;
- int oldval, ret;
+ int oldval = 0, newval, ret;
+ update_primary_asce(current);
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
pagefault_disable();
- ret = __futex_atomic_op_inuser(op, uaddr, oparg, &oldval);
+ 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;
+ }
pagefault_enable();
if (!ret) {
return ret;
}
+static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
+ u32 oldval, u32 newval)
+{
+ int ret;
+
+ update_primary_asce(current);
+ asm volatile(
+ " sacf 256\n"
+ "0: cs %1,%4,0(%5)\n"
+ "1: la %0,0\n"
+ "2: sacf 768\n"
+ EX_TABLE(0b,2b) EX_TABLE(1b,2b)
+ : "=d" (ret), "+d" (oldval), "=m" (*uaddr)
+ : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
+ : "cc", "memory");
+ *uval = oldval;
+ return ret;
+}
+
#endif /* _ASM_S390_FUTEX_H */
#define destroy_context(mm) do { } while (0)
-#ifndef CONFIG_64BIT
-#define LCTL_OPCODE "lctl"
-#else
-#define LCTL_OPCODE "lctlg"
-#endif
-
-static inline void update_user_asce(struct mm_struct *mm)
+static inline void update_user_asce(struct mm_struct *mm, int load_primary)
{
pgd_t *pgd = mm->pgd;
S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
- /* Load primary space page table origin. */
- asm volatile(LCTL_OPCODE" 1,1,%0\n" : : "m" (S390_lowcore.user_asce));
+ if (load_primary)
+ __ctl_load(S390_lowcore.user_asce, 1, 1);
set_fs(current->thread.mm_segment);
}
-static inline void clear_user_asce(struct mm_struct *mm)
+static inline void clear_user_asce(struct mm_struct *mm, int load_primary)
{
S390_lowcore.user_asce = S390_lowcore.kernel_asce;
- asm volatile(LCTL_OPCODE" 1,1,%0\n" : : "m" (S390_lowcore.user_asce));
- asm volatile(LCTL_OPCODE" 7,7,%0\n" : : "m" (S390_lowcore.user_asce));
+
+ if (load_primary)
+ __ctl_load(S390_lowcore.user_asce, 1, 1);
+ __ctl_load(S390_lowcore.user_asce, 7, 7);
+}
+
+static inline void update_primary_asce(struct task_struct *tsk)
+{
+ unsigned long asce;
+
+ __ctl_store(asce, 1, 1);
+ if (asce != S390_lowcore.kernel_asce)
+ __ctl_load(S390_lowcore.kernel_asce, 1, 1);
+ set_tsk_thread_flag(tsk, TIF_ASCE);
}
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
{
int cpu = smp_processor_id();
+ update_primary_asce(tsk);
if (prev == next)
return;
if (MACHINE_HAS_TLB_LC)
/* Delay update_user_asce until all TLB flushes are done. */
set_tsk_thread_flag(tsk, TIF_TLB_WAIT);
/* Clear old ASCE by loading the kernel ASCE. */
- clear_user_asce(next);
+ clear_user_asce(next, 0);
} else {
cpumask_set_cpu(cpu, mm_cpumask(next));
- update_user_asce(next);
+ update_user_asce(next, 0);
if (next->context.flush_mm)
/* Flush pending TLBs */
__tlb_flush_mm(next);
cpu_relax();
cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
- update_user_asce(mm);
+ update_user_asce(mm, 0);
if (mm->context.flush_mm)
__tlb_flush_mm(mm);
preempt_enable();
update_cr_regs(next); \
} \
prev = __switch_to(prev,next); \
+ update_primary_asce(current); \
} while (0)
#define finish_arch_switch(prev) do { \
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_TLB_WAIT 4 /* wait for TLB flush completion */
+#define TIF_ASCE 5 /* primary asce needs fixup / uaccess */
#define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */
#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_TLB_WAIT (1<<TIF_TLB_WAIT)
+#define _TIF_ASCE (1<<TIF_ASCE)
#define _TIF_PER_TRAP (1<<TIF_PER_TRAP)
#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define ARCH_HAS_SORT_EXTABLE
#define ARCH_HAS_SEARCH_EXTABLE
-int __handle_fault(unsigned long, unsigned long, int);
-
/**
* __copy_from_user: - Copy a block of data from user space, with less checking.
* @to: Destination address, in kernel space.
DEFINE(__LC_RESTART_FN, offsetof(struct _lowcore, restart_fn));
DEFINE(__LC_RESTART_DATA, offsetof(struct _lowcore, restart_data));
DEFINE(__LC_RESTART_SOURCE, offsetof(struct _lowcore, restart_source));
+ DEFINE(__LC_KERNEL_ASCE, offsetof(struct _lowcore, kernel_asce));
DEFINE(__LC_USER_ASCE, offsetof(struct _lowcore, user_asce));
DEFINE(__LC_INT_CLOCK, offsetof(struct _lowcore, int_clock));
DEFINE(__LC_MCCK_CLOCK, offsetof(struct _lowcore, mcck_clock));
__PT_R15 = __PT_GPRS + 60
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
- _TIF_MCCK_PENDING | _TIF_PER_TRAP )
+ _TIF_MCCK_PENDING | _TIF_PER_TRAP | _TIF_ASCE)
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
- _TIF_MCCK_PENDING)
+ _TIF_MCCK_PENDING | _TIF_ASCE)
_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
_TIF_SYSCALL_TRACEPOINT)
_TIF_TRANSFER = (_TIF_MCCK_PENDING | _TIF_TLB_WAIT)
jo sysc_sigpending
tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME
jo sysc_notify_resume
+ tm __TI_flags+3(%r12),_TIF_ASCE
+ jo sysc_uaccess
j sysc_return # beware of critical section cleanup
#
la %r14,BASED(sysc_return)
br %r1 # TIF bit will be cleared by handler
+#
+# _TIF_ASCE is set, load user space asce
+#
+sysc_uaccess:
+ ni __TI_flags+3(%r12),255-_TIF_ASCE
+ lctl %c1,%c1,__LC_USER_ASCE # load primary asce
+ j sysc_return
+
#
# _TIF_SIGPENDING is set, call do_signal
#
jo io_sigpending
tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME
jo io_notify_resume
+ tm __TI_flags+3(%r12),_TIF_ASCE
+ jo io_uaccess
j io_return # beware of critical section cleanup
#
TRACE_IRQS_OFF
j io_return
+#
+# _TIF_ASCE is set, load user space asce
+#
+io_uaccess:
+ ni __TI_flags+3(%r12),255-_TIF_ASCE
+ lctl %c1,%c1,__LC_USER_ASCE # load primary asce
+ j io_return
+
#
# _TIF_NEED_RESCHED is set, call schedule
#
STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
- _TIF_MCCK_PENDING | _TIF_PER_TRAP )
+ _TIF_MCCK_PENDING | _TIF_PER_TRAP | _TIF_ASCE)
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
- _TIF_MCCK_PENDING)
+ _TIF_MCCK_PENDING | _TIF_ASCE)
_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
_TIF_SYSCALL_TRACEPOINT)
_TIF_TRANSFER = (_TIF_MCCK_PENDING | _TIF_TLB_WAIT)
jo sysc_sigpending
tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
jo sysc_notify_resume
+ tm __TI_flags+7(%r12),_TIF_ASCE
+ jo sysc_uaccess
j sysc_return # beware of critical section cleanup
#
larl %r14,sysc_return
jg s390_handle_mcck # TIF bit will be cleared by handler
+#
+# _TIF_ASCE is set, load user space asce
+#
+sysc_uaccess:
+ ni __TI_flags+7(%r12),255-_TIF_ASCE
+ lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
+ j sysc_return
+
#
# _TIF_SIGPENDING is set, call do_signal
#
jo io_sigpending
tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
jo io_notify_resume
+ tm __TI_flags+7(%r12),_TIF_ASCE
+ jo io_uaccess
j io_return # beware of critical section cleanup
#
TRACE_IRQS_OFF
j io_return
+#
+# _TIF_ASCE is set, load user space asce
+#
+io_uaccess:
+ ni __TI_flags+7(%r12),255-_TIF_ASCE
+ lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
+ j io_return
+
#
# _TIF_NEED_RESCHED is set, call schedule
#
# Makefile for s390-specific library files..
#
-lib-y += delay.o string.o uaccess_pt.o uaccess_mvcos.o find.o
+lib-y += delay.o string.o uaccess.o find.o
obj-$(CONFIG_32BIT) += div64.o qrnnd.o ucmpdi2.o mem32.o
obj-$(CONFIG_64BIT) += mem64.o
lib-$(CONFIG_SMP) += spinlock.o
--- /dev/null
+/*
+ * Standard user space access functions based on mvcp/mvcs and doing
+ * interesting things in the secondary space mode.
+ *
+ * Copyright IBM Corp. 2006,2014
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ * Gerald Schaefer (gerald.schaefer@de.ibm.com)
+ */
+
+#include <linux/jump_label.h>
+#include <linux/uaccess.h>
+#include <linux/export.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <asm/mmu_context.h>
+#include <asm/facility.h>
+
+#ifndef CONFIG_64BIT
+#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
+
+static struct static_key have_mvcos = STATIC_KEY_INIT_FALSE;
+
+static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr,
+ unsigned long size)
+{
+ register unsigned long reg0 asm("0") = 0x81UL;
+ unsigned long tmp1, tmp2;
+
+ tmp1 = -4096UL;
+ asm volatile(
+ "0: .insn ss,0xc80000000000,0(%0,%2),0(%1),0\n"
+ "9: jz 7f\n"
+ "1:"ALR" %0,%3\n"
+ " "SLR" %1,%3\n"
+ " "SLR" %2,%3\n"
+ " j 0b\n"
+ "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */
+ " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */
+ " "SLR" %4,%1\n"
+ " "CLR" %0,%4\n" /* copy crosses next page boundary? */
+ " jnh 4f\n"
+ "3: .insn ss,0xc80000000000,0(%4,%2),0(%1),0\n"
+ "10:"SLR" %0,%4\n"
+ " "ALR" %2,%4\n"
+ "4:"LHI" %4,-1\n"
+ " "ALR" %4,%0\n" /* copy remaining size, subtract 1 */
+ " bras %3,6f\n" /* memset loop */
+ " xc 0(1,%2),0(%2)\n"
+ "5: xc 0(256,%2),0(%2)\n"
+ " la %2,256(%2)\n"
+ "6:"AHI" %4,-256\n"
+ " jnm 5b\n"
+ " ex %4,0(%3)\n"
+ " j 8f\n"
+ "7:"SLR" %0,%0\n"
+ "8:\n"
+ EX_TABLE(0b,2b) EX_TABLE(3b,4b) EX_TABLE(9b,2b) EX_TABLE(10b,4b)
+ : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
+ : "d" (reg0) : "cc", "memory");
+ return size;
+}
+
+static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr,
+ unsigned long size)
+{
+ unsigned long tmp1, tmp2;
+
+ update_primary_asce(current);
+ tmp1 = -256UL;
+ asm volatile(
+ " sacf 0\n"
+ "0: mvcp 0(%0,%2),0(%1),%3\n"
+ "10:jz 8f\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"
+ "11:jnz 1b\n"
+ " j 8f\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 5f\n"
+ "4: mvcp 0(%4,%2),0(%1),%3\n"
+ "12:"SLR" %0,%4\n"
+ " "ALR" %2,%4\n"
+ "5:"LHI" %4,-1\n"
+ " "ALR" %4,%0\n" /* copy remaining size, subtract 1 */
+ " bras %3,7f\n" /* memset loop */
+ " xc 0(1,%2),0(%2)\n"
+ "6: xc 0(256,%2),0(%2)\n"
+ " la %2,256(%2)\n"
+ "7:"AHI" %4,-256\n"
+ " jnm 6b\n"
+ " ex %4,0(%3)\n"
+ " j 9f\n"
+ "8:"SLR" %0,%0\n"
+ "9: sacf 768\n"
+ EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,5b)
+ EX_TABLE(10b,3b) EX_TABLE(11b,3b) EX_TABLE(12b,5b)
+ : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
+ : : "cc", "memory");
+ return size;
+}
+
+unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ if (static_key_false(&have_mvcos))
+ return copy_from_user_mvcos(to, from, n);
+ return copy_from_user_mvcp(to, from, n);
+}
+EXPORT_SYMBOL(__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") = 0x810000UL;
+ unsigned long tmp1, tmp2;
+
+ tmp1 = -4096UL;
+ asm volatile(
+ "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n"
+ "6: jz 4f\n"
+ "1:"ALR" %0,%3\n"
+ " "SLR" %1,%3\n"
+ " "SLR" %2,%3\n"
+ " j 0b\n"
+ "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */
+ " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */
+ " "SLR" %4,%1\n"
+ " "CLR" %0,%4\n" /* copy crosses next page boundary? */
+ " jnh 5f\n"
+ "3: .insn ss,0xc80000000000,0(%4,%1),0(%2),0\n"
+ "7:"SLR" %0,%4\n"
+ " j 5f\n"
+ "4:"SLR" %0,%0\n"
+ "5:\n"
+ EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b)
+ : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
+ : "d" (reg0) : "cc", "memory");
+ return size;
+}
+
+static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x,
+ unsigned long size)
+{
+ unsigned long tmp1, tmp2;
+
+ update_primary_asce(current);
+ tmp1 = -256UL;
+ asm volatile(
+ " sacf 0\n"
+ "0: mvcs 0(%0,%1),0(%2),%3\n"
+ "7: 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"
+ "8: 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"
+ "9:"SLR" %0,%4\n"
+ " j 6f\n"
+ "5:"SLR" %0,%0\n"
+ "6: sacf 768\n"
+ EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b)
+ EX_TABLE(7b,3b) EX_TABLE(8b,3b) EX_TABLE(9b,6b)
+ : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
+ : : "cc", "memory");
+ return size;
+}
+
+unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ if (static_key_false(&have_mvcos))
+ return copy_to_user_mvcos(to, from, n);
+ return copy_to_user_mvcs(to, from, n);
+}
+EXPORT_SYMBOL(__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") = 0x810081UL;
+ unsigned long tmp1, tmp2;
+
+ tmp1 = -4096UL;
+ /* FIXME: copy with reduced length. */
+ asm volatile(
+ "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n"
+ " jz 2f\n"
+ "1:"ALR" %0,%3\n"
+ " "SLR" %1,%3\n"
+ " "SLR" %2,%3\n"
+ " j 0b\n"
+ "2:"SLR" %0,%0\n"
+ "3: \n"
+ EX_TABLE(0b,3b)
+ : "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2)
+ : "d" (reg0) : "cc", "memory");
+ return size;
+}
+
+static inline unsigned long copy_in_user_mvc(void __user *to, const void __user *from,
+ unsigned long size)
+{
+ unsigned long tmp1;
+
+ update_primary_asce(current);
+ asm volatile(
+ " sacf 256\n"
+ " "AHI" %0,-1\n"
+ " jo 5f\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"
+ "5: "SLR" %0,%0\n"
+ "6: sacf 768\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;
+}
+
+unsigned long __copy_in_user(void __user *to, const void __user *from, unsigned long n)
+{
+ if (static_key_false(&have_mvcos))
+ return copy_in_user_mvcos(to, from, n);
+ return copy_in_user_mvc(to, from, n);
+}
+EXPORT_SYMBOL(__copy_in_user);
+
+static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size)
+{
+ register unsigned long reg0 asm("0") = 0x810000UL;
+ unsigned long tmp1, tmp2;
+
+ tmp1 = -4096UL;
+ asm volatile(
+ "0: .insn ss,0xc80000000000,0(%0,%1),0(%4),0\n"
+ " jz 4f\n"
+ "1:"ALR" %0,%2\n"
+ " "SLR" %1,%2\n"
+ " j 0b\n"
+ "2: la %3,4095(%1)\n"/* %4 = to + 4095 */
+ " nr %3,%2\n" /* %4 = (to + 4095) & -4096 */
+ " "SLR" %3,%1\n"
+ " "CLR" %0,%3\n" /* copy crosses next page boundary? */
+ " jnh 5f\n"
+ "3: .insn ss,0xc80000000000,0(%3,%1),0(%4),0\n"
+ " "SLR" %0,%3\n"
+ " j 5f\n"
+ "4:"SLR" %0,%0\n"
+ "5:\n"
+ EX_TABLE(0b,2b) EX_TABLE(3b,5b)
+ : "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2)
+ : "a" (empty_zero_page), "d" (reg0) : "cc", "memory");
+ return size;
+}
+
+static inline unsigned long clear_user_xc(void __user *to, unsigned long size)
+{
+ unsigned long tmp1, tmp2;
+
+ update_primary_asce(current);
+ asm volatile(
+ " sacf 256\n"
+ " "AHI" %0,-1\n"
+ " jo 5f\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"
+ "5: "SLR" %0,%0\n"
+ "6: sacf 768\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;
+}
+
+unsigned long __clear_user(void __user *to, unsigned long size)
+{
+ if (static_key_false(&have_mvcos))
+ return clear_user_mvcos(to, size);
+ return clear_user_xc(to, size);
+}
+EXPORT_SYMBOL(__clear_user);
+
+static inline unsigned long strnlen_user_srst(const char __user *src,
+ unsigned long size)
+{
+ register unsigned long reg0 asm("0") = 0;
+ unsigned long tmp1, tmp2;
+
+ if (unlikely(!size))
+ return 0;
+ update_primary_asce(current);
+ 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 768\n"
+ EX_TABLE(0b,1b)
+ : "+a" (size), "+a" (src), "=a" (tmp1), "=a" (tmp2)
+ : "d" (reg0) : "cc", "memory");
+ return size;
+}
+
+unsigned long __strnlen_user(const char __user *src, unsigned long size)
+{
+ update_primary_asce(current);
+ return strnlen_user_srst(src, size);
+}
+EXPORT_SYMBOL(__strnlen_user);
+
+long __strncpy_from_user(char *dst, const char __user *src, long size)
+{
+ size_t done, len, offset, len_str;
+
+ if (unlikely(size <= 0))
+ return 0;
+ done = 0;
+ do {
+ offset = (size_t)src & ~PAGE_MASK;
+ len = min(size - done, PAGE_SIZE - offset);
+ if (copy_from_user(dst, src, len))
+ return -EFAULT;
+ len_str = strnlen(dst, len);
+ done += len_str;
+ src += len_str;
+ dst += len_str;
+ } while ((len_str == len) && (done < size));
+ return done;
+}
+EXPORT_SYMBOL(__strncpy_from_user);
+
+/*
+ * The "old" uaccess variant without mvcos can be enforced with the
+ * uaccess_primary kernel parameter. This is mainly for debugging purposes.
+ */
+static int uaccess_primary __initdata;
+
+static int __init parse_uaccess_pt(char *__unused)
+{
+ uaccess_primary = 1;
+ return 0;
+}
+early_param("uaccess_primary", parse_uaccess_pt);
+
+static int __init uaccess_init(void)
+{
+ if (IS_ENABLED(CONFIG_64BIT) && !uaccess_primary && test_facility(27))
+ static_key_slow_inc(&have_mvcos);
+ return 0;
+}
+early_initcall(uaccess_init);
+++ /dev/null
-/*
- * Copyright IBM Corp. 2007
- *
- */
-
-#ifndef __ARCH_S390_LIB_UACCESS_H
-#define __ARCH_S390_LIB_UACCESS_H
-
-unsigned long copy_from_user_pt(void *to, const void __user *from, unsigned long n);
-unsigned long copy_to_user_pt(void __user *to, const void *from, unsigned long n);
-unsigned long copy_in_user_pt(void __user *to, const void __user *from, unsigned long n);
-unsigned long clear_user_pt(void __user *to, unsigned long n);
-unsigned long strnlen_user_pt(const char __user *src, unsigned long count);
-long strncpy_from_user_pt(char *dst, const char __user *src, long count);
-
-#endif /* __ARCH_S390_LIB_UACCESS_H */
+++ /dev/null
-/*
- * Optimized user space space access functions based on mvcos.
- *
- * Copyright IBM Corp. 2006
- * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
- * Gerald Schaefer (gerald.schaefer@de.ibm.com)
- */
-
-#include <linux/jump_label.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <asm/facility.h>
-#include <asm/uaccess.h>
-#include <asm/futex.h>
-#include "uaccess.h"
-
-#ifndef CONFIG_64BIT
-#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
-
-static struct static_key have_mvcos = STATIC_KEY_INIT_TRUE;
-
-static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr,
- unsigned long size)
-{
- register unsigned long reg0 asm("0") = 0x81UL;
- unsigned long tmp1, tmp2;
-
- tmp1 = -4096UL;
- asm volatile(
- "0: .insn ss,0xc80000000000,0(%0,%2),0(%1),0\n"
- "9: jz 7f\n"
- "1:"ALR" %0,%3\n"
- " "SLR" %1,%3\n"
- " "SLR" %2,%3\n"
- " j 0b\n"
- "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */
- " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */
- " "SLR" %4,%1\n"
- " "CLR" %0,%4\n" /* copy crosses next page boundary? */
- " jnh 4f\n"
- "3: .insn ss,0xc80000000000,0(%4,%2),0(%1),0\n"
- "10:"SLR" %0,%4\n"
- " "ALR" %2,%4\n"
- "4:"LHI" %4,-1\n"
- " "ALR" %4,%0\n" /* copy remaining size, subtract 1 */
- " bras %3,6f\n" /* memset loop */
- " xc 0(1,%2),0(%2)\n"
- "5: xc 0(256,%2),0(%2)\n"
- " la %2,256(%2)\n"
- "6:"AHI" %4,-256\n"
- " jnm 5b\n"
- " ex %4,0(%3)\n"
- " j 8f\n"
- "7:"SLR" %0,%0\n"
- "8: \n"
- EX_TABLE(0b,2b) EX_TABLE(3b,4b) EX_TABLE(9b,2b) EX_TABLE(10b,4b)
- : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
- : "d" (reg0) : "cc", "memory");
- return size;
-}
-
-unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- if (static_key_true(&have_mvcos))
- return copy_from_user_mvcos(to, from, n);
- return copy_from_user_pt(to, from, n);
-}
-EXPORT_SYMBOL(__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") = 0x810000UL;
- unsigned long tmp1, tmp2;
-
- tmp1 = -4096UL;
- asm volatile(
- "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n"
- "6: jz 4f\n"
- "1:"ALR" %0,%3\n"
- " "SLR" %1,%3\n"
- " "SLR" %2,%3\n"
- " j 0b\n"
- "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */
- " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */
- " "SLR" %4,%1\n"
- " "CLR" %0,%4\n" /* copy crosses next page boundary? */
- " jnh 5f\n"
- "3: .insn ss,0xc80000000000,0(%4,%1),0(%2),0\n"
- "7:"SLR" %0,%4\n"
- " j 5f\n"
- "4:"SLR" %0,%0\n"
- "5: \n"
- EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b)
- : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
- : "d" (reg0) : "cc", "memory");
- return size;
-}
-
-unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- if (static_key_true(&have_mvcos))
- return copy_to_user_mvcos(to, from, n);
- return copy_to_user_pt(to, from, n);
-}
-EXPORT_SYMBOL(__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") = 0x810081UL;
- unsigned long tmp1, tmp2;
-
- tmp1 = -4096UL;
- /* FIXME: copy with reduced length. */
- asm volatile(
- "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n"
- " jz 2f\n"
- "1:"ALR" %0,%3\n"
- " "SLR" %1,%3\n"
- " "SLR" %2,%3\n"
- " j 0b\n"
- "2:"SLR" %0,%0\n"
- "3: \n"
- EX_TABLE(0b,3b)
- : "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2)
- : "d" (reg0) : "cc", "memory");
- return size;
-}
-
-unsigned long __copy_in_user(void __user *to, const void __user *from, unsigned long n)
-{
- if (static_key_true(&have_mvcos))
- return copy_in_user_mvcos(to, from, n);
- return copy_in_user_pt(to, from, n);
-}
-EXPORT_SYMBOL(__copy_in_user);
-
-static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size)
-{
- register unsigned long reg0 asm("0") = 0x810000UL;
- unsigned long tmp1, tmp2;
-
- tmp1 = -4096UL;
- asm volatile(
- "0: .insn ss,0xc80000000000,0(%0,%1),0(%4),0\n"
- " jz 4f\n"
- "1:"ALR" %0,%2\n"
- " "SLR" %1,%2\n"
- " j 0b\n"
- "2: la %3,4095(%1)\n"/* %4 = to + 4095 */
- " nr %3,%2\n" /* %4 = (to + 4095) & -4096 */
- " "SLR" %3,%1\n"
- " "CLR" %0,%3\n" /* copy crosses next page boundary? */
- " jnh 5f\n"
- "3: .insn ss,0xc80000000000,0(%3,%1),0(%4),0\n"
- " "SLR" %0,%3\n"
- " j 5f\n"
- "4:"SLR" %0,%0\n"
- "5: \n"
- EX_TABLE(0b,2b) EX_TABLE(3b,5b)
- : "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2)
- : "a" (empty_zero_page), "d" (reg0) : "cc", "memory");
- return size;
-}
-
-unsigned long __clear_user(void __user *to, unsigned long size)
-{
- if (static_key_true(&have_mvcos))
- return clear_user_mvcos(to, size);
- return clear_user_pt(to, size);
-}
-EXPORT_SYMBOL(__clear_user);
-
-static inline unsigned long strnlen_user_mvcos(const char __user *src,
- unsigned long count)
-{
- unsigned long done, len, offset, len_str;
- char buf[256];
-
- done = 0;
- do {
- offset = (unsigned long)src & ~PAGE_MASK;
- len = min(256UL, PAGE_SIZE - offset);
- len = min(count - done, len);
- if (copy_from_user_mvcos(buf, src, len))
- return 0;
- len_str = strnlen(buf, len);
- done += len_str;
- src += len_str;
- } while ((len_str == len) && (done < count));
- return done + 1;
-}
-
-unsigned long __strnlen_user(const char __user *src, unsigned long count)
-{
- if (static_key_true(&have_mvcos))
- return strnlen_user_mvcos(src, count);
- return strnlen_user_pt(src, count);
-}
-EXPORT_SYMBOL(__strnlen_user);
-
-static inline long strncpy_from_user_mvcos(char *dst, const char __user *src,
- long count)
-{
- unsigned long done, len, offset, len_str;
-
- if (unlikely(count <= 0))
- return 0;
- done = 0;
- do {
- offset = (unsigned long)src & ~PAGE_MASK;
- len = min(count - done, PAGE_SIZE - offset);
- if (copy_from_user_mvcos(dst, src, len))
- return -EFAULT;
- len_str = strnlen(dst, len);
- done += len_str;
- src += len_str;
- dst += len_str;
- } while ((len_str == len) && (done < count));
- return done;
-}
-
-long __strncpy_from_user(char *dst, const char __user *src, long count)
-{
- if (static_key_true(&have_mvcos))
- return strncpy_from_user_mvcos(dst, src, count);
- return strncpy_from_user_pt(dst, src, count);
-}
-EXPORT_SYMBOL(__strncpy_from_user);
-
-/*
- * The uaccess page tabe walk variant can be enforced with the "uaccesspt"
- * kernel parameter. This is mainly for debugging purposes.
- */
-static int force_uaccess_pt __initdata;
-
-static int __init parse_uaccess_pt(char *__unused)
-{
- force_uaccess_pt = 1;
- return 0;
-}
-early_param("uaccesspt", parse_uaccess_pt);
-
-static int __init uaccess_init(void)
-{
- if (IS_ENABLED(CONFIG_32BIT) || force_uaccess_pt || !test_facility(27))
- static_key_slow_dec(&have_mvcos);
- return 0;
-}
-early_initcall(uaccess_init);
+++ /dev/null
-/*
- * User access functions based on page table walks for enhanced
- * system layout without hardware support.
- *
- * Copyright IBM Corp. 2006, 2012
- * Author(s): Gerald Schaefer (gerald.schaefer@de.ibm.com)
- */
-
-#include <linux/errno.h>
-#include <linux/hardirq.h>
-#include <linux/mm.h>
-#include <linux/hugetlb.h>
-#include <asm/uaccess.h>
-#include <asm/futex.h>
-#include "uaccess.h"
-
-#ifndef CONFIG_64BIT
-#define AHI "ahi"
-#define SLR "slr"
-#else
-#define AHI "aghi"
-#define SLR "slgr"
-#endif
-
-static unsigned long strnlen_kernel(const char __user *src, unsigned long count)
-{
- 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"
- "0: srst %3,%2\n"
- " jo 0b\n"
- " la %0,1(%3)\n" /* strnlen_kernel results includes \0 */
- " "SLR" %0,%1\n"
- "1:\n"
- EX_TABLE(0b,1b)
- : "+a" (count), "+a" (src), "=a" (tmp1), "=a" (tmp2)
- : "d" (reg0) : "cc", "memory");
- return count;
-}
-
-static unsigned long copy_in_kernel(void __user *to, const void __user *from,
- unsigned long count)
-{
- unsigned long tmp1;
-
- asm volatile(
- " "AHI" %0,-1\n"
- " jo 5f\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"
- "5:"SLR" %0,%0\n"
- "6:\n"
- EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
- : "+a" (count), "+a" (to), "+a" (from), "=a" (tmp1)
- : : "cc", "memory");
- return count;
-}
-
-/*
- * Returns kernel address for user virtual address. If the returned address is
- * >= -4095 (IS_ERR_VALUE(x) returns true), a fault has occurred and the
- * address contains the (negative) exception code.
- */
-#ifdef CONFIG_64BIT
-
-static unsigned long follow_table(struct mm_struct *mm,
- unsigned long address, int write)
-{
- unsigned long *table = (unsigned long *)__pa(mm->pgd);
-
- if (unlikely(address > mm->context.asce_limit - 1))
- return -0x38UL;
- switch (mm->context.asce_bits & _ASCE_TYPE_MASK) {
- case _ASCE_TYPE_REGION1:
- table = table + ((address >> 53) & 0x7ff);
- if (unlikely(*table & _REGION_ENTRY_INVALID))
- return -0x39UL;
- table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
- /* fallthrough */
- case _ASCE_TYPE_REGION2:
- table = table + ((address >> 42) & 0x7ff);
- if (unlikely(*table & _REGION_ENTRY_INVALID))
- return -0x3aUL;
- table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
- /* fallthrough */
- case _ASCE_TYPE_REGION3:
- table = table + ((address >> 31) & 0x7ff);
- if (unlikely(*table & _REGION_ENTRY_INVALID))
- return -0x3bUL;
- table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
- /* fallthrough */
- case _ASCE_TYPE_SEGMENT:
- table = table + ((address >> 20) & 0x7ff);
- if (unlikely(*table & _SEGMENT_ENTRY_INVALID))
- return -0x10UL;
- if (unlikely(*table & _SEGMENT_ENTRY_LARGE)) {
- if (write && (*table & _SEGMENT_ENTRY_PROTECT))
- return -0x04UL;
- return (*table & _SEGMENT_ENTRY_ORIGIN_LARGE) +
- (address & ~_SEGMENT_ENTRY_ORIGIN_LARGE);
- }
- table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN);
- }
- table = table + ((address >> 12) & 0xff);
- if (unlikely(*table & _PAGE_INVALID))
- return -0x11UL;
- if (write && (*table & _PAGE_PROTECT))
- return -0x04UL;
- return (*table & PAGE_MASK) + (address & ~PAGE_MASK);
-}
-
-#else /* CONFIG_64BIT */
-
-static unsigned long follow_table(struct mm_struct *mm,
- unsigned long address, int write)
-{
- unsigned long *table = (unsigned long *)__pa(mm->pgd);
-
- table = table + ((address >> 20) & 0x7ff);
- if (unlikely(*table & _SEGMENT_ENTRY_INVALID))
- return -0x10UL;
- table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN);
- table = table + ((address >> 12) & 0xff);
- if (unlikely(*table & _PAGE_INVALID))
- return -0x11UL;
- if (write && (*table & _PAGE_PROTECT))
- return -0x04UL;
- return (*table & PAGE_MASK) + (address & ~PAGE_MASK);
-}
-
-#endif /* CONFIG_64BIT */
-
-static inline unsigned long __user_copy_pt(unsigned long uaddr, void *kptr,
- unsigned long n, int write_user)
-{
- struct mm_struct *mm = current->mm;
- unsigned long offset, done, size, kaddr;
- void *from, *to;
-
- if (!mm)
- return n;
- done = 0;
-retry:
- spin_lock(&mm->page_table_lock);
- do {
- kaddr = follow_table(mm, uaddr, write_user);
- if (IS_ERR_VALUE(kaddr))
- goto fault;
-
- offset = uaddr & ~PAGE_MASK;
- size = min(n - done, PAGE_SIZE - offset);
- if (write_user) {
- to = (void *) kaddr;
- from = kptr + done;
- } else {
- from = (void *) kaddr;
- to = kptr + done;
- }
- memcpy(to, from, size);
- done += size;
- uaddr += size;
- } while (done < n);
- spin_unlock(&mm->page_table_lock);
- return n - done;
-fault:
- spin_unlock(&mm->page_table_lock);
- if (__handle_fault(uaddr, -kaddr, write_user))
- return n - done;
- goto retry;
-}
-
-/*
- * Do DAT for user address by page table walk, return kernel address.
- * This function needs to be called with current->mm->page_table_lock held.
- */
-static inline unsigned long __dat_user_addr(unsigned long uaddr, int write)
-{
- struct mm_struct *mm = current->mm;
- unsigned long kaddr;
- int rc;
-
-retry:
- kaddr = follow_table(mm, uaddr, write);
- if (IS_ERR_VALUE(kaddr))
- goto fault;
-
- return kaddr;
-fault:
- spin_unlock(&mm->page_table_lock);
- rc = __handle_fault(uaddr, -kaddr, write);
- spin_lock(&mm->page_table_lock);
- if (!rc)
- goto retry;
- return 0;
-}
-
-unsigned long copy_from_user_pt(void *to, const void __user *from, unsigned long n)
-{
- unsigned long rc;
-
- if (segment_eq(get_fs(), KERNEL_DS))
- return copy_in_kernel((void __user *) to, from, n);
- rc = __user_copy_pt((unsigned long) from, to, n, 0);
- if (unlikely(rc))
- memset(to + n - rc, 0, rc);
- return rc;
-}
-
-unsigned long copy_to_user_pt(void __user *to, const void *from, unsigned long n)
-{
- if (segment_eq(get_fs(), KERNEL_DS))
- return copy_in_kernel(to, (void __user *) from, n);
- return __user_copy_pt((unsigned long) to, (void *) from, n, 1);
-}
-
-unsigned long clear_user_pt(void __user *to, unsigned long n)
-{
- void *zpage = (void *) empty_zero_page;
- unsigned long done, size, ret;
-
- done = 0;
- do {
- if (n - done > PAGE_SIZE)
- size = PAGE_SIZE;
- else
- size = n - done;
- if (segment_eq(get_fs(), KERNEL_DS))
- ret = copy_in_kernel(to, (void __user *) zpage, n);
- else
- ret = __user_copy_pt((unsigned long) to, zpage, size, 1);
- done += size;
- to += size;
- if (ret)
- return ret + n - done;
- } while (done < n);
- return 0;
-}
-
-unsigned long strnlen_user_pt(const char __user *src, unsigned long count)
-{
- unsigned long uaddr = (unsigned long) src;
- struct mm_struct *mm = current->mm;
- unsigned long offset, done, len, kaddr;
- unsigned long len_str;
-
- if (unlikely(!count))
- return 0;
- if (segment_eq(get_fs(), KERNEL_DS))
- return strnlen_kernel(src, count);
- if (!mm)
- return 0;
- done = 0;
-retry:
- spin_lock(&mm->page_table_lock);
- do {
- kaddr = follow_table(mm, uaddr, 0);
- if (IS_ERR_VALUE(kaddr))
- goto fault;
-
- offset = uaddr & ~PAGE_MASK;
- len = min(count - done, PAGE_SIZE - offset);
- len_str = strnlen((char *) kaddr, len);
- done += len_str;
- uaddr += len_str;
- } while ((len_str == len) && (done < count));
- spin_unlock(&mm->page_table_lock);
- return done + 1;
-fault:
- spin_unlock(&mm->page_table_lock);
- if (__handle_fault(uaddr, -kaddr, 0))
- return 0;
- goto retry;
-}
-
-long strncpy_from_user_pt(char *dst, const char __user *src, long count)
-{
- unsigned long done, len, offset, len_str;
-
- if (unlikely(count <= 0))
- return 0;
- done = 0;
- do {
- offset = (unsigned long)src & ~PAGE_MASK;
- len = min(count - done, PAGE_SIZE - offset);
- if (segment_eq(get_fs(), KERNEL_DS)) {
- if (copy_in_kernel((void __user *) dst, src, len))
- return -EFAULT;
- } else {
- if (__user_copy_pt((unsigned long) src, dst, len, 0))
- return -EFAULT;
- }
- len_str = strnlen(dst, len);
- done += len_str;
- src += len_str;
- dst += len_str;
- } while ((len_str == len) && (done < count));
- return done;
-}
-
-unsigned long copy_in_user_pt(void __user *to, const void __user *from,
- unsigned long n)
-{
- struct mm_struct *mm = current->mm;
- unsigned long offset_max, uaddr, done, size, error_code;
- unsigned long uaddr_from = (unsigned long) from;
- unsigned long uaddr_to = (unsigned long) to;
- unsigned long kaddr_to, kaddr_from;
- int write_user;
-
- if (segment_eq(get_fs(), KERNEL_DS))
- return copy_in_kernel(to, from, n);
- if (!mm)
- return n;
- done = 0;
-retry:
- spin_lock(&mm->page_table_lock);
- do {
- write_user = 0;
- uaddr = uaddr_from;
- kaddr_from = follow_table(mm, uaddr_from, 0);
- error_code = kaddr_from;
- if (IS_ERR_VALUE(error_code))
- goto fault;
-
- write_user = 1;
- uaddr = uaddr_to;
- kaddr_to = follow_table(mm, uaddr_to, 1);
- error_code = (unsigned long) kaddr_to;
- if (IS_ERR_VALUE(error_code))
- goto fault;
-
- offset_max = max(uaddr_from & ~PAGE_MASK,
- uaddr_to & ~PAGE_MASK);
- size = min(n - done, PAGE_SIZE - offset_max);
-
- memcpy((void *) kaddr_to, (void *) kaddr_from, size);
- done += size;
- uaddr_from += size;
- uaddr_to += size;
- } while (done < n);
- spin_unlock(&mm->page_table_lock);
- return n - done;
-fault:
- spin_unlock(&mm->page_table_lock);
- if (__handle_fault(uaddr, -error_code, write_user))
- return n - done;
- goto retry;
-}
-
-#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
- asm volatile("0: l %1,0(%6)\n" \
- "1: " insn \
- "2: cs %1,%2,0(%6)\n" \
- "3: jl 1b\n" \
- " lhi %0,0\n" \
- "4:\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" );
-
-static int __futex_atomic_op_pt(int op, u32 __user *uaddr, int oparg, int *old)
-{
- int oldval = 0, newval, ret;
-
- 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;
- }
- if (ret == 0)
- *old = oldval;
- return ret;
-}
-
-int __futex_atomic_op_inuser(int op, u32 __user *uaddr, int oparg, int *old)
-{
- int ret;
-
- if (segment_eq(get_fs(), KERNEL_DS))
- return __futex_atomic_op_pt(op, uaddr, oparg, old);
- if (unlikely(!current->mm))
- return -EFAULT;
- spin_lock(¤t->mm->page_table_lock);
- uaddr = (u32 __force __user *)
- __dat_user_addr((__force unsigned long) uaddr, 1);
- if (!uaddr) {
- spin_unlock(¤t->mm->page_table_lock);
- return -EFAULT;
- }
- get_page(virt_to_page(uaddr));
- spin_unlock(¤t->mm->page_table_lock);
- ret = __futex_atomic_op_pt(op, uaddr, oparg, old);
- put_page(virt_to_page(uaddr));
- return ret;
-}
-
-static int __futex_atomic_cmpxchg_pt(u32 *uval, u32 __user *uaddr,
- u32 oldval, u32 newval)
-{
- int ret;
-
- asm volatile("0: cs %1,%4,0(%5)\n"
- "1: la %0,0\n"
- "2:\n"
- EX_TABLE(0b,2b) EX_TABLE(1b,2b)
- : "=d" (ret), "+d" (oldval), "=m" (*uaddr)
- : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
- : "cc", "memory" );
- *uval = oldval;
- return ret;
-}
-
-int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
- u32 oldval, u32 newval)
-{
- int ret;
-
- if (segment_eq(get_fs(), KERNEL_DS))
- return __futex_atomic_cmpxchg_pt(uval, uaddr, oldval, newval);
- if (unlikely(!current->mm))
- return -EFAULT;
- spin_lock(¤t->mm->page_table_lock);
- uaddr = (u32 __force __user *)
- __dat_user_addr((__force unsigned long) uaddr, 1);
- if (!uaddr) {
- spin_unlock(¤t->mm->page_table_lock);
- return -EFAULT;
- }
- get_page(virt_to_page(uaddr));
- spin_unlock(¤t->mm->page_table_lock);
- ret = __futex_atomic_cmpxchg_pt(uval, uaddr, oldval, newval);
- put_page(virt_to_page(uaddr));
- return ret;
-}
* Returns the address space associated with the fault.
* Returns 0 for kernel space and 1 for user space.
*/
-static inline int user_space_fault(unsigned long trans_exc_code)
+static inline int user_space_fault(struct pt_regs *regs)
{
+ unsigned long trans_exc_code;
+
/*
* The lowest two bits of the translation exception
* identification indicate which paging table was used.
*/
- trans_exc_code &= 3;
- if (trans_exc_code == 2)
- /* Access via secondary space, set_fs setting decides */
+ trans_exc_code = regs->int_parm_long & 3;
+ if (trans_exc_code == 3) /* home space -> kernel */
+ return 0;
+ if (user_mode(regs))
+ return 1;
+ if (trans_exc_code == 2) /* secondary space -> set_fs */
return current->thread.mm_segment.ar4;
- /*
- * Access via primary space or access register is from user space
- * and access via home space is from the kernel.
- */
- return trans_exc_code != 3;
+ if (current->flags & PF_VCPU)
+ return 1;
+ return 0;
}
static inline void report_user_fault(struct pt_regs *regs, long signr)
* terminate things with extreme prejudice.
*/
address = regs->int_parm_long & __FAIL_ADDR_MASK;
- if (!user_space_fault(regs->int_parm_long))
+ if (!user_space_fault(regs))
printk(KERN_ALERT "Unable to handle kernel pointer dereference"
" at virtual kernel address %p\n", (void *)address);
else
* user context.
*/
fault = VM_FAULT_BADCONTEXT;
- if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
+ if (unlikely(!user_space_fault(regs) || in_atomic() || !mm))
goto out;
address = trans_exc_code & __FAIL_ADDR_MASK;
do_fault_error(regs, fault);
}
-int __handle_fault(unsigned long uaddr, unsigned long pgm_int_code, int write)
-{
- struct pt_regs regs;
- int access, fault;
-
- /* Emulate a uaccess fault from kernel mode. */
- regs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_MCHECK;
- if (!irqs_disabled())
- regs.psw.mask |= PSW_MASK_IO | PSW_MASK_EXT;
- regs.psw.addr = (unsigned long) __builtin_return_address(0);
- regs.psw.addr |= PSW_ADDR_AMODE;
- regs.int_code = pgm_int_code;
- regs.int_parm_long = (uaddr & PAGE_MASK) | 2;
- access = write ? VM_WRITE : VM_READ;
- fault = do_exception(®s, access);
- /*
- * Since the fault happened in kernel mode while performing a uaccess
- * all we need to do now is emulating a fixup in case "fault" is not
- * zero.
- * For the calling uaccess functions this results always in -EFAULT.
- */
- return fault ? -EFAULT : 0;
-}
-
#ifdef CONFIG_PFAULT
/*
* 'pfault' pseudo page faults routines.
struct mm_struct *mm = arg;
if (current->active_mm == mm)
- update_user_asce(mm);
+ update_user_asce(mm, 1);
__tlb_flush_local();
}
pgd_t *pgd;
if (current->active_mm == mm) {
- clear_user_asce(mm);
+ clear_user_asce(mm, 1);
__tlb_flush_mm(mm);
}
while (mm->context.asce_limit > limit) {
crst_table_free(mm, (unsigned long *) pgd);
}
if (current->active_mm == mm)
- update_user_asce(mm);
+ update_user_asce(mm, 1);
}
#endif
projects / thirdparty / kernel / stable.git / commitdiff
