Simplify the uaccess code by removing the user_mode=home option.
The kernel will now always run in the home space mode.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
pgd_t *pgd = mm->pgd;
S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
- if (s390_user_mode != HOME_SPACE_MODE) {
- /* Load primary space page table origin. */
- asm volatile(LCTL_OPCODE" 1,1,%0\n"
- : : "m" (S390_lowcore.user_asce) );
- } else
- /* Load home space page table origin. */
- asm volatile(LCTL_OPCODE" 13,13,%0"
- : : "m" (S390_lowcore.user_asce) );
+ /* Load primary space page table origin. */
+ asm volatile(LCTL_OPCODE" 1,1,%0\n" : : "m" (S390_lowcore.user_asce));
set_fs(current->thread.mm_segment);
}
* Do necessary setup to start up a new thread.
*/
#define start_thread(regs, new_psw, new_stackp) do { \
- regs->psw.mask = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA; \
+ regs->psw.mask = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA; \
regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
regs->gprs[15] = new_stackp; \
execve_tail(); \
} while (0)
#define start_thread31(regs, new_psw, new_stackp) do { \
- regs->psw.mask = psw_user_bits | PSW_MASK_BA; \
+ regs->psw.mask = PSW_USER_BITS | PSW_MASK_BA; \
regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
regs->gprs[15] = new_stackp; \
__tlb_flush_mm(current->mm); \
}
#define local_mcck_enable() \
- __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK)
+ __set_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_MCHECK)
#define local_mcck_disable() \
- __set_psw_mask(psw_kernel_bits | PSW_MASK_DAT)
+ __set_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT)
/*
* Basic Machine Check/Program Check Handler.
#ifndef __ASSEMBLY__
-extern long psw_kernel_bits;
-extern long psw_user_bits;
+#define PSW_KERNEL_BITS (PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_HOME | \
+ PSW_MASK_EA | PSW_MASK_BA)
+#define PSW_USER_BITS (PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
+ PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK | \
+ PSW_MASK_PSTATE | PSW_ASC_PRIMARY)
/*
* The pt_regs struct defines the way the registers are stored on
void create_mem_hole(struct mem_chunk mem_chunk[], unsigned long addr,
unsigned long size);
-#define PRIMARY_SPACE_MODE 0
-#define ACCESS_REGISTER_MODE 1
-#define SECONDARY_SPACE_MODE 2
-#define HOME_SPACE_MODE 3
-
-extern unsigned int s390_user_mode;
-
/*
* Machine features detected in head.S
*/
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 *);
};
extern struct uaccess_ops uaccess;
-extern struct uaccess_ops uaccess_std;
extern struct uaccess_ops uaccess_mvcos;
-extern struct uaccess_ops uaccess_mvcos_switch;
extern struct uaccess_ops uaccess_pt;
extern int __handle_fault(unsigned long, unsigned long, int);
static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
{
- size = uaccess.copy_to_user_small(size, ptr, x);
+ size = uaccess.copy_to_user(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);
+ size = uaccess.copy_from_user(size, ptr, x);
return size ? -EFAULT : size;
}
static inline unsigned long __must_check
__copy_to_user(void __user *to, const void *from, unsigned long n)
{
- 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);
+ return uaccess.copy_to_user(n, to, from);
}
#define __copy_to_user_inatomic __copy_to_user
static inline unsigned long __must_check
__copy_from_user(void *to, const void __user *from, unsigned long n)
{
- 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);
+ return uaccess.copy_from_user(n, from, to);
}
extern void copy_from_user_overflow(void)
(__u64)(regs32.psw.mask & PSW32_MASK_USER) << 32 |
(__u64)(regs32.psw.addr & PSW32_ADDR_AMODE);
/* Check for invalid user address space control. */
- if ((regs->psw.mask & PSW_MASK_ASC) >= (psw_kernel_bits & PSW_MASK_ASC))
- regs->psw.mask = (psw_user_bits & PSW_MASK_ASC) |
+ if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
+ regs->psw.mask = PSW_ASC_PRIMARY |
(regs->psw.mask & ~PSW_MASK_ASC);
regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
for (i = 0; i < NUM_GPRS; i++)
regs->gprs[15] = (__force __u64) frame;
/* Force 31 bit amode and default user address space control. */
regs->psw.mask = PSW_MASK_BA |
- (psw_user_bits & PSW_MASK_ASC) |
+ (PSW_USER_BITS & PSW_MASK_ASC) |
(regs->psw.mask & ~PSW_MASK_ASC);
regs->psw.addr = (__force __u64) ka->sa.sa_handler;
regs->gprs[15] = (__force __u64) frame;
/* Force 31 bit amode and default user address space control. */
regs->psw.mask = PSW_MASK_BA |
- (psw_user_bits & PSW_MASK_ASC) |
+ (PSW_USER_BITS & PSW_MASK_ASC) |
(regs->psw.mask & ~PSW_MASK_ASC);
regs->psw.addr = (__u64 __force) ka->sa.sa_handler;
__ctl_clear_bit(0,28);
/* Set new machine check handler */
- S390_lowcore.mcck_new_psw.mask = psw_kernel_bits | PSW_MASK_DAT;
+ S390_lowcore.mcck_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT;
S390_lowcore.mcck_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
/* Set new program check handler */
- S390_lowcore.program_new_psw.mask = psw_kernel_bits | PSW_MASK_DAT;
+ S390_lowcore.program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT;
S390_lowcore.program_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
if (unlikely(p->flags & PF_KTHREAD)) {
/* kernel thread */
memset(&frame->childregs, 0, sizeof(struct pt_regs));
- frame->childregs.psw.mask = psw_kernel_bits | PSW_MASK_DAT |
+ frame->childregs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT |
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
frame->childregs.psw.addr = PSW_ADDR_AMODE |
(unsigned long) kernel_thread_starter;
tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
if (addr == (addr_t) &dummy->regs.psw.mask)
/* Return a clean psw mask. */
- tmp = psw_user_bits | (tmp & PSW_MASK_USER);
+ tmp = PSW_USER_BITS | (tmp & PSW_MASK_USER);
} else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
/*
* psw and gprs are stored on the stack
*/
if (addr == (addr_t) &dummy->regs.psw.mask &&
- ((data & ~PSW_MASK_USER) != psw_user_bits ||
+ ((data & ~PSW_MASK_USER) != PSW_USER_BITS ||
((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))))
/* Invalid psw mask. */
return -EINVAL;
static void init_runtime_instr_cb(struct runtime_instr_cb *cb)
{
cb->buf_limit = 0xfff;
- if (s390_user_mode == HOME_SPACE_MODE)
- cb->home_space = 1;
cb->int_requested = 1;
cb->pstate = 1;
cb->pstate_set_buf = 1;
#include <asm/sclp.h>
#include "entry.h"
-long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
- PSW_MASK_EA | PSW_MASK_BA;
-long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
- PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
- PSW_MASK_PSTATE | PSW_ASC_HOME;
-
/*
* User copy operations.
*/
}
early_param("vmalloc", parse_vmalloc);
-unsigned int s390_user_mode = PRIMARY_SPACE_MODE;
-EXPORT_SYMBOL_GPL(s390_user_mode);
-
-static void __init set_user_mode_primary(void)
-{
- psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
- psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
-#ifdef CONFIG_COMPAT
- psw32_user_bits =
- (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
-#endif
- uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos_switch : uaccess_pt;
-}
-
static int __init early_parse_user_mode(char *p)
{
- if (p && strcmp(p, "primary") == 0)
- s390_user_mode = PRIMARY_SPACE_MODE;
- else if (!p || strcmp(p, "home") == 0)
- s390_user_mode = HOME_SPACE_MODE;
- else
- return 1;
- return 0;
+ if (!p || strcmp(p, "primary") == 0)
+ return 0;
+ return 1;
}
early_param("user_mode", early_parse_user_mode);
-static void __init setup_addressing_mode(void)
-{
- if (s390_user_mode != PRIMARY_SPACE_MODE)
- return;
- set_user_mode_primary();
- if (MACHINE_HAS_MVCOS)
- pr_info("Address spaces switched, mvcos available\n");
- else
- pr_info("Address spaces switched, mvcos not available\n");
-}
-
void *restart_stack __attribute__((__section__(".data")));
static void __init setup_lowcore(void)
*/
BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
- lc->restart_psw.mask = psw_kernel_bits;
+ lc->restart_psw.mask = PSW_KERNEL_BITS;
lc->restart_psw.addr =
PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
- lc->external_new_psw.mask = psw_kernel_bits |
+ lc->external_new_psw.mask = PSW_KERNEL_BITS |
PSW_MASK_DAT | PSW_MASK_MCHECK;
lc->external_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
- lc->svc_new_psw.mask = psw_kernel_bits |
+ lc->svc_new_psw.mask = PSW_KERNEL_BITS |
PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
- lc->program_new_psw.mask = psw_kernel_bits |
+ lc->program_new_psw.mask = PSW_KERNEL_BITS |
PSW_MASK_DAT | PSW_MASK_MCHECK;
lc->program_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
- lc->mcck_new_psw.mask = psw_kernel_bits;
+ lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
lc->mcck_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
- lc->io_new_psw.mask = psw_kernel_bits |
+ lc->io_new_psw.mask = PSW_KERNEL_BITS |
PSW_MASK_DAT | PSW_MASK_MCHECK;
lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
lc->clock_comparator = -1ULL;
init_mm.end_data = (unsigned long) &_edata;
init_mm.brk = (unsigned long) &_end;
- if (MACHINE_HAS_MVCOS)
- memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
- else
- memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
+ uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos : uaccess_pt;
parse_early_param();
detect_memory_layout(memory_chunk, memory_end);
setup_ipl();
reserve_oldmem();
setup_memory_end();
- setup_addressing_mode();
reserve_crashkernel();
setup_memory();
setup_resources();
/* Copy a 'clean' PSW mask to the user to avoid leaking
information about whether PER is currently on. */
- user_sregs.regs.psw.mask = psw_user_bits |
+ user_sregs.regs.psw.mask = PSW_USER_BITS |
(regs->psw.mask & PSW_MASK_USER);
user_sregs.regs.psw.addr = regs->psw.addr;
memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs));
err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs));
if (err)
return err;
- /* Use regs->psw.mask instead of psw_user_bits to preserve PER bit. */
+ /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
(user_sregs.regs.psw.mask & PSW_MASK_USER);
/* Check for invalid user address space control. */
- if ((regs->psw.mask & PSW_MASK_ASC) >= (psw_kernel_bits & PSW_MASK_ASC))
- regs->psw.mask = (psw_user_bits & PSW_MASK_ASC) |
+ if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
+ regs->psw.mask = PSW_ASC_PRIMARY |
(regs->psw.mask & ~PSW_MASK_ASC);
/* Check for invalid amode */
if (regs->psw.mask & PSW_MASK_EA)
regs->gprs[15] = (unsigned long) frame;
/* Force default amode and default user address space control. */
regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
- (psw_user_bits & PSW_MASK_ASC) |
+ (PSW_USER_BITS & PSW_MASK_ASC) |
(regs->psw.mask & ~PSW_MASK_ASC);
regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
regs->gprs[15] = (unsigned long) frame;
/* Force default amode and default user address space control. */
regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
- (psw_user_bits & PSW_MASK_ASC) |
+ (PSW_USER_BITS & PSW_MASK_ASC) |
(regs->psw.mask & ~PSW_MASK_ASC);
regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
struct _lowcore *lc = lowcore_ptr[pcpu - pcpu_devices];
unsigned long source_cpu = stap();
- __load_psw_mask(psw_kernel_bits);
+ __load_psw_mask(PSW_KERNEL_BITS);
if (pcpu->address == source_cpu)
func(data); /* should not return */
/* Stop target cpu (if func returns this stops the current cpu). */
int cpu;
/* Disable all interrupts/machine checks */
- __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT);
+ __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
trace_hardirqs_off();
debug_set_critical();
S390_lowcore.restart_source = -1UL;
restore_access_regs(S390_lowcore.access_regs_save_area);
__ctl_load(S390_lowcore.cregs_save_area, 0, 15);
- __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT);
+ __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
cpu_init();
preempt_disable();
init_cpu_timer();
*/
static void vdso_init_data(struct vdso_data *vd)
{
- vd->ectg_available =
- s390_user_mode != HOME_SPACE_MODE && test_facility(31);
+ vd->ectg_available = test_facility(31);
}
#ifdef CONFIG_64BIT
lowcore->vdso_per_cpu_data = __LC_PASTE;
- if (s390_user_mode == HOME_SPACE_MODE || !vdso_enabled)
+ if (!vdso_enabled)
return 0;
segment_table = __get_free_pages(GFP_KERNEL, SEGMENT_ORDER);
unsigned long segment_table, page_table, page_frame;
u32 *psal, *aste;
- if (s390_user_mode == HOME_SPACE_MODE || !vdso_enabled)
+ if (!vdso_enabled)
return;
psal = (u32 *)(addr_t) lowcore->paste[4];
{
unsigned long cr5;
- if (s390_user_mode == HOME_SPACE_MODE || !vdso_enabled)
+ if (!vdso_enabled)
return;
cr5 = offsetof(struct _lowcore, paste);
__ctl_load(cr5, 5, 5);
trace_hardirqs_on();
/* Wait for external, I/O or machine check interrupt. */
- psw_mask = psw_kernel_bits | PSW_MASK_WAIT | PSW_MASK_DAT |
+ psw_mask = PSW_KERNEL_BITS | PSW_MASK_WAIT | PSW_MASK_DAT |
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
idle->nohz_delay = 0;
# Makefile for s390-specific library files..
#
-lib-y += delay.o string.o uaccess_std.o uaccess_pt.o find.o
+lib-y += delay.o string.o uaccess_pt.o find.o
obj-$(CONFIG_32BIT) += div64.o qrnnd.o ucmpdi2.o mem32.o
obj-$(CONFIG_64BIT) += mem64.o
lib-$(CONFIG_64BIT) += uaccess_mvcos.o
return size;
}
-static size_t copy_from_user_mvcos_check(size_t size, const void __user *ptr, void *x)
-{
- if (size <= 256)
- return copy_from_user_std(size, ptr, x);
- return copy_from_user_mvcos(size, ptr, x);
-}
-
static size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
{
register unsigned long reg0 asm("0") = 0x810000UL;
return size;
}
-static size_t copy_to_user_mvcos_check(size_t size, void __user *ptr,
- const void *x)
-{
- if (size <= 256)
- return copy_to_user_std(size, ptr, x);
- return copy_to_user_mvcos(size, ptr, x);
-}
-
static size_t copy_in_user_mvcos(size_t size, void __user *to,
const void __user *from)
{
}
struct uaccess_ops uaccess_mvcos = {
- .copy_from_user = copy_from_user_mvcos_check,
- .copy_from_user_small = copy_from_user_std,
- .copy_to_user = copy_to_user_mvcos_check,
- .copy_to_user_small = copy_to_user_std,
- .copy_in_user = copy_in_user_mvcos,
- .clear_user = clear_user_mvcos,
- .strnlen_user = strnlen_user_std,
- .strncpy_from_user = strncpy_from_user_std,
- .futex_atomic_op = futex_atomic_op_std,
- .futex_atomic_cmpxchg = futex_atomic_cmpxchg_std,
-};
-
-struct uaccess_ops uaccess_mvcos_switch = {
.copy_from_user = copy_from_user_mvcos,
- .copy_from_user_small = copy_from_user_mvcos,
.copy_to_user = copy_to_user_mvcos,
- .copy_to_user_small = copy_to_user_mvcos,
.copy_in_user = copy_in_user_mvcos,
.clear_user = clear_user_mvcos,
.strnlen_user = strnlen_user_mvcos,
struct uaccess_ops uaccess_pt = {
.copy_from_user = copy_from_user_pt,
- .copy_from_user_small = copy_from_user_pt,
.copy_to_user = copy_to_user_pt,
- .copy_to_user_small = copy_to_user_pt,
.copy_in_user = copy_in_user_pt,
.clear_user = clear_user_pt,
.strnlen_user = strnlen_user_pt,
+++ /dev/null
-/*
- * Standard user space access functions based on mvcp/mvcs and doing
- * interesting things in the secondary space mode.
- *
- * Copyright 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 <linux/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
-
-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"
- "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: \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;
-}
-
-static size_t copy_from_user_std_check(size_t size, const void __user *ptr,
- void *x)
-{
- if (size <= 1024)
- return copy_from_user_std(size, ptr, x);
- return copy_from_user_pt(size, ptr, x);
-}
-
-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"
- "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: \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;
-}
-
-static size_t copy_to_user_std_check(size_t size, void __user *ptr,
- const void *x)
-{
- if (size <= 1024)
- return copy_to_user_std(size, ptr, x);
- return copy_to_user_pt(size, ptr, x);
-}
-
-static size_t copy_in_user_std(size_t size, void __user *to,
- const void __user *from)
-{
- unsigned long tmp1;
-
- 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 0\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;
-}
-
-static size_t clear_user_std(size_t size, void __user *to)
-{
- unsigned long tmp1, tmp2;
-
- 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 0\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;
-
- if (unlikely(!size))
- return 0;
- 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 count, const char __user *src, char *dst)
-{
- size_t done, len, offset, len_str;
-
- if (unlikely(!count))
- return 0;
- done = 0;
- do {
- offset = (size_t)src & ~PAGE_MASK;
- len = min(count - done, PAGE_SIZE - offset);
- if (copy_from_user_std(len, src, dst))
- return -EFAULT;
- len_str = strnlen(dst, len);
- done += len_str;
- src += len_str;
- dst += len_str;
- } while ((len_str == len) && (done < count));
- return done;
-}
-
-#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_std(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;
- }
- *old = oldval;
- return ret;
-}
-
-int futex_atomic_cmpxchg_std(u32 *uval, u32 __user *uaddr,
- u32 oldval, u32 newval)
-{
- int ret;
-
- asm volatile(
- " sacf 256\n"
- "0: cs %1,%4,0(%5)\n"
- "1: la %0,0\n"
- "2: sacf 0\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;
-}
-
-struct uaccess_ops uaccess_std = {
- .copy_from_user = copy_from_user_std_check,
- .copy_from_user_small = copy_from_user_std,
- .copy_to_user = copy_to_user_std_check,
- .copy_to_user_small = copy_to_user_std,
- .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_std,
- .futex_atomic_cmpxchg = futex_atomic_cmpxchg_std,
-};
if (trans_exc_code == 2)
/* Access via secondary space, set_fs setting decides */
return current->thread.mm_segment.ar4;
- if (s390_user_mode == HOME_SPACE_MODE)
- /* User space if the access has been done via home space. */
- return trans_exc_code == 3;
/*
- * If the user space is not the home space the kernel runs in home
- * space. Access via secondary space has already been covered,
- * access via primary space or access register is from user space
+ * 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;
int access, fault;
/* Emulate a uaccess fault from kernel mode. */
- regs.psw.mask = psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK;
+ 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);
struct mm_struct *mm = tsk->mm;
struct mmu_gather tlb;
- /* Do we have switched amode? If no, we cannot do sie */
- if (s390_user_mode == HOME_SPACE_MODE)
- return -EINVAL;
-
/* Do we have pgstes? if yes, we are done */
if (mm_has_pgste(tsk->mm))
return 0;
projects / platform / kernel / linux-rpi.git / commitdiff