select PCI_DOMAINS if PCI
select PCI_MSI if PCI
select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
- select SET_FS
select SPARSE_IRQ
select SYSCTL_EXCEPTION_TRACE
select THREAD_INFO_IN_TASK
u32 __user *uaddr)
{
int oldval = 0, newval, ret;
- mm_segment_t old_fs;
- old_fs = enable_sacf_uaccess();
switch (op) {
case FUTEX_OP_SET:
__futex_atomic_op("lr %2,%5\n",
default:
ret = -ENOSYS;
}
- disable_sacf_uaccess(old_fs);
if (!ret)
*oval = oldval;
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
- mm_segment_t old_fs;
int ret;
- old_fs = enable_sacf_uaccess();
asm volatile(
" sacf 256\n"
"0: cs %1,%4,0(%5)\n"
: "=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;
}
/* Address space pointer. */
__u64 kernel_asce; /* 0x0380 */
__u64 user_asce; /* 0x0388 */
- __u64 vdso_asce; /* 0x0390 */
+ __u8 pad_0x0390[0x0398-0x0390]; /* 0x0390 */
/*
* The lpp and current_pid fields form a
__u32 spinlock_index; /* 0x03b0 */
__u32 fpu_flags; /* 0x03b4 */
__u64 percpu_offset; /* 0x03b8 */
- __u64 vdso_per_cpu_data; /* 0x03c0 */
+ __u8 pad_0x03c0[0x03c8-0x03c0]; /* 0x03c0 */
__u64 machine_flags; /* 0x03c8 */
__u64 gmap; /* 0x03d0 */
__u8 pad_0x03d8[0x0400-0x03d8]; /* 0x03d8 */
#define destroy_context(mm) do { } while (0)
-static inline void set_user_asce(struct mm_struct *mm)
-{
- S390_lowcore.user_asce = mm->context.asce;
- __ctl_load(S390_lowcore.user_asce, 1, 1);
- clear_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)
{
S390_lowcore.user_asce = next->context.asce;
cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
- /* 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);
- }
+ /* Clear previous user-ASCE from CR7 */
+ __ctl_load(S390_lowcore.kernel_asce, 7, 7);
if (prev != next)
cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
}
__tlb_flush_mm_lazy(mm);
preempt_enable();
}
- set_fs(current->thread.mm_segment);
+ __ctl_load(S390_lowcore.user_asce, 7, 7);
}
#define enter_lazy_tlb(mm,tsk) do { } while (0)
{
switch_mm(prev, next, current);
cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
- set_user_asce(next);
+ __ctl_load(S390_lowcore.user_asce, 7, 7);
}
#endif /* __S390_MMU_CONTEXT_H */
#include <linux/bits.h>
-#define CIF_ASCE_PRIMARY 0 /* primary asce needs fixup / uaccess */
-#define CIF_ASCE_SECONDARY 1 /* secondary asce needs fixup / uaccess */
#define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */
#define CIF_FPU 3 /* restore FPU registers */
#define CIF_IGNORE_IRQ 4 /* ignore interrupt (for udelay) */
#define CIF_MCCK_GUEST 6 /* machine check happening in guest */
#define CIF_DEDICATED_CPU 7 /* this CPU is dedicated */
-#define _CIF_ASCE_PRIMARY BIT(CIF_ASCE_PRIMARY)
-#define _CIF_ASCE_SECONDARY BIT(CIF_ASCE_SECONDARY)
#define _CIF_NOHZ_DELAY BIT(CIF_NOHZ_DELAY)
#define _CIF_FPU BIT(CIF_FPU)
#define _CIF_IGNORE_IRQ BIT(CIF_IGNORE_IRQ)
#define HAVE_ARCH_PICK_MMAP_LAYOUT
-typedef unsigned int mm_segment_t;
-
/*
* Thread structure
*/
unsigned long hardirq_timer; /* task cputime in hardirq context */
unsigned long softirq_timer; /* task cputime in softirq context */
unsigned long sys_call_table; /* system call table address */
- mm_segment_t mm_segment;
unsigned long gmap_addr; /* address of last gmap fault. */
unsigned int gmap_write_flag; /* gmap fault write indication */
unsigned int gmap_int_code; /* int code of last gmap fault */
unsigned int int_parm;
unsigned long int_parm_long;
unsigned long flags;
+ unsigned long cr1;
};
/*
#include <asm/extable.h>
#include <asm/facility.h>
-/*
- * The fs value determines whether argument validity checking should be
- * performed or not. If get_fs() == USER_DS, checking is performed, with
- * get_fs() == KERNEL_DS, checking is bypassed.
- *
- * For historical reasons, these macros are grossly misnamed.
- */
-
-#define KERNEL_DS (0)
-#define KERNEL_DS_SACF (1)
-#define USER_DS (2)
-#define USER_DS_SACF (3)
-
-#define get_fs() (current->thread.mm_segment)
-#define uaccess_kernel() ((get_fs() & 2) == KERNEL_DS)
-
-void set_fs(mm_segment_t fs);
-
static inline int __range_ok(unsigned long addr, unsigned long size)
{
return 1;
static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
{
- unsigned long spec = 0x010000UL;
+ unsigned long spec = 0x810000UL;
int rc;
switch (size) {
static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
{
- unsigned long spec = 0x01UL;
+ unsigned long spec = 0x81UL;
int rc;
switch (size) {
#ifndef __ASSEMBLY__
-/*
- * Note about the vdso_data and vdso_per_cpu_data structures:
- *
- * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
- * structure is supposed to be known only to the function in the vdso
- * itself and may change without notice.
- */
-
-struct vdso_per_cpu_data {
- /*
- * Note: node_id and cpu_nr must be at adjacent memory locations.
- * VDSO userspace must read both values with a single instruction.
- */
- union {
- __u64 getcpu_val;
- struct {
- __u32 node_id;
- __u32 cpu_nr;
- };
- };
-};
-
extern struct vdso_data *vdso_data;
-int vdso_alloc_per_cpu(struct lowcore *lowcore);
-void vdso_free_per_cpu(struct lowcore *lowcore);
-
#endif /* __ASSEMBLY__ */
#endif /* __S390_VDSO_H__ */
#include <linux/purgatory.h>
#include <linux/pgtable.h>
#include <asm/idle.h>
-#include <asm/vdso.h>
#include <asm/gmap.h>
#include <asm/nmi.h>
#include <asm/stacktrace.h>
OFFSET(__PT_INT_PARM, pt_regs, int_parm);
OFFSET(__PT_INT_PARM_LONG, pt_regs, int_parm_long);
OFFSET(__PT_FLAGS, pt_regs, flags);
+ OFFSET(__PT_CR1, pt_regs, cr1);
DEFINE(__PT_SIZE, sizeof(struct pt_regs));
BLANK();
/* stack_frame offsets */
OFFSET(__SF_SIE_REASON, stack_frame, empty1[3]);
OFFSET(__SF_SIE_FLAGS, stack_frame, empty1[4]);
BLANK();
- OFFSET(__VDSO_GETCPU_VAL, vdso_per_cpu_data, getcpu_val);
- BLANK();
/* idle data offsets */
OFFSET(__CLOCK_IDLE_ENTER, s390_idle_data, clock_idle_enter);
OFFSET(__CLOCK_IDLE_EXIT, s390_idle_data, clock_idle_exit);
OFFSET(__LC_RESTART_FN, lowcore, restart_fn);
OFFSET(__LC_RESTART_DATA, lowcore, restart_data);
OFFSET(__LC_RESTART_SOURCE, lowcore, restart_source);
+ OFFSET(__LC_KERNEL_ASCE, lowcore, kernel_asce);
OFFSET(__LC_USER_ASCE, lowcore, user_asce);
- OFFSET(__LC_VDSO_ASCE, lowcore, vdso_asce);
OFFSET(__LC_LPP, lowcore, lpp);
OFFSET(__LC_CURRENT_PID, lowcore, current_pid);
OFFSET(__LC_PERCPU_OFFSET, lowcore, percpu_offset);
- OFFSET(__LC_VDSO_PER_CPU, lowcore, vdso_per_cpu_data);
OFFSET(__LC_MACHINE_FLAGS, lowcore, machine_flags);
OFFSET(__LC_PREEMPT_COUNT, lowcore, preempt_count);
OFFSET(__LC_GMAP, lowcore, gmap);
_TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING)
_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
_TIF_SYSCALL_TRACEPOINT)
-_CIF_WORK = (_CIF_ASCE_PRIMARY | _CIF_ASCE_SECONDARY | _CIF_FPU)
+_CIF_WORK = (_CIF_FPU)
_PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART)
_LPP_OFFSET = __LC_LPP
BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
.Lsie_skip:
ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
- lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
+ lctlg %c1,%c1,__LC_KERNEL_ASCE # load primary asce
.Lsie_done:
# some program checks are suppressing. C code (e.g. do_protection_exception)
# will rewind the PSW by the ILC, which is often 4 bytes in case of SIE. There
lg %r12,__LC_CURRENT
lghi %r14,_PIF_SYSCALL
.Lsysc_per:
+ lctlg %c1,%c1,__LC_KERNEL_ASCE
lghi %r13,__TASK_thread
lg %r15,__LC_KERNEL_STACK
la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
jnz .Lsysc_work
TSTMSK __TI_flags(%r12),_TIF_WORK
jnz .Lsysc_work # check for work
- TSTMSK __LC_CPU_FLAGS,(_CIF_WORK-_CIF_FPU)
- jnz .Lsysc_work
+ lctlg %c1,%c1,__LC_USER_ASCE
BPEXIT __TI_flags(%r12),_TIF_ISOLATE_BP
TSTMSK __LC_CPU_FLAGS, _CIF_FPU
jz .Lsysc_skip_fpu
jo .Lsysc_sigpending
TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME
jo .Lsysc_notify_resume
- TSTMSK __LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY)
- jnz .Lsysc_asce
j .Lsysc_return
#
larl %r14,.Lsysc_return
jg schedule
-#
-# _CIF_ASCE_PRIMARY and/or _CIF_ASCE_SECONDARY set, load user space asce
-#
-.Lsysc_asce:
- ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_SECONDARY
- lctlg %c7,%c7,__LC_VDSO_ASCE # load secondary asce
- TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_PRIMARY
- jz .Lsysc_return
-#ifndef CONFIG_HAVE_MARCH_Z10_FEATURES
- tm __LC_STFLE_FAC_LIST+3,0x10 # has MVCOS ?
- jnz .Lsysc_set_fs_fixup
- ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
- lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
- j .Lsysc_return
-.Lsysc_set_fs_fixup:
-#endif
- larl %r14,.Lsysc_return
- jg set_fs_fixup
-
-
#
# _TIF_SIGPENDING is set, call do_signal
#
0: lg %r12,__LC_CURRENT
lghi %r11,0
lmg %r8,%r9,__LC_PGM_OLD_PSW
- tmhh %r8,0x0001 # test problem state bit
- jnz 3f # -> fault in user space
+ tmhh %r8,0x0001 # coming from user space?
+ jno .Lpgm_skip_asce
+ lctlg %c1,%c1,__LC_KERNEL_ASCE
+ j 3f
+.Lpgm_skip_asce:
#if IS_ENABLED(CONFIG_KVM)
# cleanup critical section for program checks in sie64a
lgr %r14,%r9
jhe 1f
lg %r14,__SF_SIE_CONTROL(%r15) # get control block pointer
ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
- lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
+ lctlg %c1,%c1,__LC_KERNEL_ASCE # load primary asce
larl %r9,sie_exit # skip forward to sie_exit
lghi %r11,_PIF_GUEST_FAULT
#endif
xgr %r10,%r10
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
stmg %r8,%r9,__PT_PSW(%r11)
+ tm __PT_PSW+1(%r11),0x01 # coming from user space?
+ jno .Lio_skip_asce
+ lctlg %c1,%c1,__LC_KERNEL_ASCE
+.Lio_skip_asce:
mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ
mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
tm __PT_PSW+1(%r11),0x01 # returning to user ?
jno .Lio_exit_kernel
+ lctlg %c1,%c1,__LC_USER_ASCE
BPEXIT __TI_flags(%r12),_TIF_ISOLATE_BP
stpt __LC_EXIT_TIMER
.Lio_exit_kernel:
jo .Lio_guarded_storage
TSTMSK __LC_CPU_FLAGS,_CIF_FPU
jo .Lio_vxrs
- TSTMSK __LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY)
- jnz .Lio_asce
j .Lio_return
-#
-# _CIF_ASCE_PRIMARY and/or CIF_ASCE_SECONDARY set, load user space asce
-#
-.Lio_asce:
- ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_SECONDARY
- lctlg %c7,%c7,__LC_VDSO_ASCE # load secondary asce
- TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_PRIMARY
- jz .Lio_return
-#ifndef CONFIG_HAVE_MARCH_Z10_FEATURES
- tm __LC_STFLE_FAC_LIST+3,0x10 # has MVCOS ?
- jnz .Lio_set_fs_fixup
- ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY
- lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
- j .Lio_return
-.Lio_set_fs_fixup:
-#endif
- larl %r14,.Lio_return
- jg set_fs_fixup
-
#
# CIF_FPU is set, restore floating-point controls and floating-point registers.
#
xgr %r10,%r10
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
stmg %r8,%r9,__PT_PSW(%r11)
+ tm __PT_PSW+1(%r11),0x01 # coming from user space?
+ jno .Lext_skip_asce
+ lctlg %c1,%c1,__LC_KERNEL_ASCE
+.Lext_skip_asce:
lghi %r1,__LC_EXT_PARAMS2
mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR
mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS
xgr %r10,%r10
mvc __PT_R8(64,%r11),0(%r14)
stmg %r8,%r9,__PT_PSW(%r11)
+ la %r14,4095
+ mvc __PT_CR1(8,%r11),__LC_CREGS_SAVE_AREA-4095+8(%r14)
+ lctlg %c1,%c1,__LC_KERNEL_ASCE
xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
lgr %r2,%r11 # pass pointer to pt_regs
brasl %r14,s390_handle_mcck
TRACE_IRQS_ON
.Lmcck_return:
+ lctlg %c1,%c1,__PT_CR1(%r11)
lmg %r0,%r10,__PT_R0(%r11)
mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
1: BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
lg %r9,__SF_SIE_CONTROL(%r15) # get control block pointer
ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE
- lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
+ lctlg %c1,%c1,__LC_KERNEL_ASCE
larl %r9,sie_exit # skip forward to sie_exit
BR_EX %r14,%r11
DECLARE_PER_CPU(u64, mt_cycles[8]);
void gs_load_bc_cb(struct pt_regs *regs);
-void set_fs_fixup(void);
unsigned long stack_alloc(void);
void stack_free(unsigned long stack);
/* Save access registers to new thread structure. */
save_access_regs(&p->thread.acrs[0]);
/* start new process with ar4 pointing to the correct address space */
- p->thread.mm_segment = get_fs();
/* Don't copy debug registers */
memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
ret = PAGE_ALIGN(mm->brk + brk_rnd());
return (ret > mm->brk) ? ret : mm->brk;
}
-
-void set_fs_fixup(void)
-{
- struct pt_regs *regs = current_pt_regs();
- static bool warned;
-
- set_fs(USER_DS);
- if (warned)
- return;
- WARN(1, "Unbalanced set_fs - int code: 0x%x\n", regs->int_code);
- show_registers(regs);
- warned = true;
-}
#include <asm/vtimer.h>
#include <asm/lowcore.h>
#include <asm/sclp.h>
-#include <asm/vdso.h>
#include <asm/debug.h>
#include <asm/os_info.h>
#include <asm/sigp.h>
lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
if (nmi_alloc_per_cpu(lc))
goto out_async;
- if (vdso_alloc_per_cpu(lc))
- goto out_mcesa;
lowcore_ptr[cpu] = lc;
pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, (u32)(unsigned long) lc);
return 0;
-out_mcesa:
- nmi_free_per_cpu(lc);
out_async:
stack_free(async_stack);
out:
pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, 0);
lowcore_ptr[pcpu - pcpu_devices] = NULL;
- vdso_free_per_cpu(pcpu->lowcore);
nmi_free_per_cpu(pcpu->lowcore);
stack_free(async_stack);
if (pcpu == &pcpu_devices[0])
lc->steal_timer = lc->avg_steal_timer = 0;
__ctl_store(lc->cregs_save_area, 0, 15);
lc->cregs_save_area[1] = lc->kernel_asce;
- lc->cregs_save_area[7] = lc->vdso_asce;
+ lc->cregs_save_area[7] = lc->user_asce;
save_access_regs((unsigned int *) lc->access_regs_save_area);
memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
sizeof(lc->stfle_fac_list));
S390_lowcore.last_update_clock = get_tod_clock();
restore_access_regs(S390_lowcore.access_regs_save_area);
- set_cpu_flag(CIF_ASCE_PRIMARY);
- set_cpu_flag(CIF_ASCE_SECONDARY);
cpu_init();
rcu_cpu_starting(cpu);
preempt_disable();
u8 page[PAGE_SIZE];
} vdso_data_store __page_aligned_data;
struct vdso_data *vdso_data = (struct vdso_data *)&vdso_data_store.data;
-/*
- * Allocate/free per cpu vdso data.
- */
-#define SEGMENT_ORDER 2
-
-int vdso_alloc_per_cpu(struct lowcore *lowcore)
-{
- unsigned long segment_table, page_table, page_frame;
- struct vdso_per_cpu_data *vd;
-
- segment_table = __get_free_pages(GFP_KERNEL, SEGMENT_ORDER);
- page_table = get_zeroed_page(GFP_KERNEL);
- page_frame = get_zeroed_page(GFP_KERNEL);
- if (!segment_table || !page_table || !page_frame)
- goto out;
- arch_set_page_dat(virt_to_page(segment_table), SEGMENT_ORDER);
- arch_set_page_dat(virt_to_page(page_table), 0);
-
- /* Initialize per-cpu vdso data page */
- vd = (struct vdso_per_cpu_data *) page_frame;
- vd->cpu_nr = lowcore->cpu_nr;
- vd->node_id = cpu_to_node(vd->cpu_nr);
-
- /* Set up page table for the vdso address space */
- memset64((u64 *)segment_table, _SEGMENT_ENTRY_EMPTY, _CRST_ENTRIES);
- memset64((u64 *)page_table, _PAGE_INVALID, PTRS_PER_PTE);
-
- *(unsigned long *) segment_table = _SEGMENT_ENTRY + page_table;
- *(unsigned long *) page_table = _PAGE_PROTECT + page_frame;
-
- lowcore->vdso_asce = segment_table +
- _ASCE_TABLE_LENGTH + _ASCE_USER_BITS + _ASCE_TYPE_SEGMENT;
- lowcore->vdso_per_cpu_data = page_frame;
-
- return 0;
-
-out:
- free_page(page_frame);
- free_page(page_table);
- free_pages(segment_table, SEGMENT_ORDER);
- return -ENOMEM;
-}
-
-void vdso_free_per_cpu(struct lowcore *lowcore)
-{
- unsigned long segment_table, page_table, page_frame;
-
- segment_table = lowcore->vdso_asce & PAGE_MASK;
- page_table = *(unsigned long *) segment_table;
- page_frame = *(unsigned long *) page_table;
-
- free_page(page_frame);
- free_page(page_table);
- free_pages(segment_table, SEGMENT_ORDER);
-}
/*
* This is called from binfmt_elf, we create the special vma for the
}
vdso64_pagelist[vdso64_pages - 1] = virt_to_page(vdso_data);
vdso64_pagelist[vdso64_pages] = NULL;
- if (vdso_alloc_per_cpu(&S390_lowcore))
- BUG();
get_page(virt_to_page(vdso_data));
ARCH_REL_TYPE_ABS += R_390_GOT|R_390_PLT
include $(srctree)/lib/vdso/Makefile
-obj-vdso64 = vdso_user_wrapper.o note.o getcpu.o
+obj-vdso64 = vdso_user_wrapper.o note.o
obj-cvdso64 = vdso64_generic.o
CFLAGS_REMOVE_vdso64_generic.o = -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE)
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Userland implementation of getcpu() for 64 bits processes in a
- * s390 kernel for use in the vDSO
- *
- * Copyright IBM Corp. 2016
- * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
- */
-#include <asm/vdso.h>
-#include <asm/asm-offsets.h>
-#include <asm/dwarf.h>
-
- .text
- .align 4
- .globl __kernel_getcpu
- .type __kernel_getcpu,@function
-__kernel_getcpu:
- CFI_STARTPROC
- sacf 256
- lm %r4,%r5,__VDSO_GETCPU_VAL(%r0)
- sacf 0
- ltgr %r2,%r2
- jz 2f
- st %r5,0(%r2)
-2: ltgr %r3,%r3
- jz 3f
- st %r4,0(%r3)
-3: lghi %r2,0
- br %r14
- CFI_ENDPROC
- .size __kernel_getcpu,.-__kernel_getcpu
__kernel_gettimeofday;
__kernel_clock_gettime;
__kernel_clock_getres;
- __kernel_getcpu;
local: *;
};
}
#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;
unsigned long size)
{
unsigned long tmp1, tmp2;
- mm_segment_t old_fs;
- old_fs = enable_sacf_uaccess();
tmp1 = -256UL;
asm volatile(
" sacf 0\n"
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;
}
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;
unsigned long size)
{
unsigned long tmp1, tmp2;
- mm_segment_t old_fs;
- old_fs = enable_sacf_uaccess();
tmp1 = -256UL;
asm volatile(
" sacf 0\n"
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;
}
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;
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"
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;
}
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;
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"
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;
}
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);
enum fault_type {
KERNEL_FAULT,
USER_FAULT,
- VDSO_FAULT,
GMAP_FAULT,
};
trans_exc_code = regs->int_parm_long & 3;
if (likely(trans_exc_code == 0)) {
/* primary space exception */
- if (IS_ENABLED(CONFIG_PGSTE) &&
- test_pt_regs_flag(regs, PIF_GUEST_FAULT))
- return GMAP_FAULT;
- if (current->thread.mm_segment == USER_DS)
+ if (user_mode(regs))
return USER_FAULT;
- return KERNEL_FAULT;
- }
- if (trans_exc_code == 2) {
- /* secondary space exception */
- if (current->thread.mm_segment & 1) {
- if (current->thread.mm_segment == USER_DS_SACF)
- return USER_FAULT;
+ if (!IS_ENABLED(CONFIG_PGSTE))
return KERNEL_FAULT;
- }
- return VDSO_FAULT;
+ if (test_pt_regs_flag(regs, PIF_GUEST_FAULT))
+ return GMAP_FAULT;
+ return KERNEL_FAULT;
}
+ if (trans_exc_code == 2)
+ return USER_FAULT;
if (trans_exc_code == 1) {
/* access register mode, not used in the kernel */
return USER_FAULT;
asce = S390_lowcore.user_asce;
pr_cont("user ");
break;
- case VDSO_FAULT:
- asce = S390_lowcore.vdso_asce;
- pr_cont("vdso ");
- break;
case GMAP_FAULT:
asce = ((struct gmap *) S390_lowcore.gmap)->asce;
pr_cont("gmap ");
switch (type) {
case KERNEL_FAULT:
goto out;
- case VDSO_FAULT:
- fault = VM_FAULT_BADMAP;
- goto out;
case USER_FAULT:
case GMAP_FAULT:
if (faulthandler_disabled() || !mm)
if (rc)
BUG();
break;
- case VDSO_FAULT:
case GMAP_FAULT:
default:
do_fault_error(regs, VM_READ | VM_WRITE, VM_FAULT_BADMAP);
{
struct mm_struct *mm = arg;
- /* we must change all active ASCEs to avoid the creation of new TLBs */
+ /* change all active ASCEs to avoid the creation of new TLBs */
if (current->active_mm == mm) {
S390_lowcore.user_asce = mm->context.asce;
- if (current->thread.mm_segment == USER_DS) {
- __ctl_load(S390_lowcore.user_asce, 1, 1);
- /* Mark user-ASCE present in CR1 */
- clear_cpu_flag(CIF_ASCE_PRIMARY);
- }
- if (current->thread.mm_segment == USER_DS_SACF) {
- __ctl_load(S390_lowcore.user_asce, 7, 7);
- /* enable_sacf_uaccess does all or nothing */
- WARN_ON(!test_cpu_flag(CIF_ASCE_SECONDARY));
- }
+ __ctl_load(S390_lowcore.user_asce, 7, 7);
}
__tlb_flush_local();
}
{
int size, rc = 0;
u8 status = 0;
- mm_segment_t old_fs;
if (!src)
return -EINVAL;
- old_fs = enable_sacf_uaccess();
while (n > 0) {
size = zpci_get_max_write_size((u64 __force) dst,
(u64 __force) src, n,
dst += size;
n -= size;
}
- disable_sacf_uaccess(old_fs);
if (rc)
zpci_err_mmio(rc, status, (__force u64) dst);
return rc;
{
int size, rc = 0;
u8 status;
- mm_segment_t old_fs;
- old_fs = enable_sacf_uaccess();
while (n > 0) {
size = zpci_get_max_write_size((u64 __force) src,
(u64 __force) dst, n,
dst += size;
n -= size;
}
- disable_sacf_uaccess(old_fs);
if (rc)
zpci_err_mmio(rc, status, (__force u64) dst);
return rc;
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