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authorLinus Torvalds <torvalds@linux-foundation.org>2009-12-09 19:01:47 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-09 19:01:47 -0800
commit67dd2f5a669f48e48ea1013fb80522adca8287f4 (patch)
treeeee4e7f15df90f899211cde0a669d661085de05d /arch/s390/mm
parent5327b9b83a9c45a3fcbcda224a2b02d9eea9f6bb (diff)
parent42d61b9b415686d81eaa022b846737548876e51d (diff)
downloadlinux-linaro-android-67dd2f5a669f48e48ea1013fb80522adca8287f4.tar.gz
Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: (72 commits) [S390] 3215/3270 console: remove wrong comment [S390] dasd: remove BKL from extended error reporting code [S390] vmlogrdr: remove BKL [S390] vmur: remove BKL [S390] zcrypt: remove BKL [S390] 3270: remove BKL [S390] vmwatchdog: remove lock_kernel() from open() function [S390] monwriter: remove lock_kernel() from open() function [S390] monreader: remove lock_kernel() from open() function [S390] s390: remove unused nfsd #includes [S390] ftrace: build ftrace.o when CONFIG_FTRACE_SYSCALLS is set for s390 [S390] etr/stp: put correct per cpu variable [S390] tty3270: move keyboard compat ioctls [S390] sclp: improve servicability setting [S390] s390: use change recording override for kernel mapping [S390] MAINTAINERS: Add s390 drivers block [S390] use generic sockios.h header file [S390] use generic termbits.h header file [S390] smp: remove unused typedef and defines [S390] cmm: free pages on hibernate. ...
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/cmm.c61
-rw-r--r--arch/s390/mm/fault.c378
-rw-r--r--arch/s390/mm/pgtable.c2
-rw-r--r--arch/s390/mm/vmem.c11
4 files changed, 250 insertions, 202 deletions
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
index ff58779bf7e..76a3637b88e 100644
--- a/arch/s390/mm/cmm.c
+++ b/arch/s390/mm/cmm.c
@@ -18,6 +18,7 @@
#include <linux/swap.h>
#include <linux/kthread.h>
#include <linux/oom.h>
+#include <linux/suspend.h>
#include <asm/pgalloc.h>
#include <asm/uaccess.h>
@@ -44,6 +45,7 @@ static volatile long cmm_pages_target;
static volatile long cmm_timed_pages_target;
static long cmm_timeout_pages;
static long cmm_timeout_seconds;
+static int cmm_suspended;
static struct cmm_page_array *cmm_page_list;
static struct cmm_page_array *cmm_timed_page_list;
@@ -147,9 +149,9 @@ cmm_thread(void *dummy)
while (1) {
rc = wait_event_interruptible(cmm_thread_wait,
- (cmm_pages != cmm_pages_target ||
- cmm_timed_pages != cmm_timed_pages_target ||
- kthread_should_stop()));
+ (!cmm_suspended && (cmm_pages != cmm_pages_target ||
+ cmm_timed_pages != cmm_timed_pages_target)) ||
+ kthread_should_stop());
if (kthread_should_stop() || rc == -ERESTARTSYS) {
cmm_pages_target = cmm_pages;
cmm_timed_pages_target = cmm_timed_pages;
@@ -410,6 +412,38 @@ cmm_smsg_target(char *from, char *msg)
static struct ctl_table_header *cmm_sysctl_header;
+static int cmm_suspend(void)
+{
+ cmm_suspended = 1;
+ cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
+ cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
+ return 0;
+}
+
+static int cmm_resume(void)
+{
+ cmm_suspended = 0;
+ cmm_kick_thread();
+ return 0;
+}
+
+static int cmm_power_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ switch (event) {
+ case PM_POST_HIBERNATION:
+ return cmm_resume();
+ case PM_HIBERNATION_PREPARE:
+ return cmm_suspend();
+ default:
+ return NOTIFY_DONE;
+ }
+}
+
+static struct notifier_block cmm_power_notifier = {
+ .notifier_call = cmm_power_event,
+};
+
static int
cmm_init (void)
{
@@ -418,7 +452,7 @@ cmm_init (void)
#ifdef CONFIG_CMM_PROC
cmm_sysctl_header = register_sysctl_table(cmm_dir_table);
if (!cmm_sysctl_header)
- goto out;
+ goto out_sysctl;
#endif
#ifdef CONFIG_CMM_IUCV
rc = smsg_register_callback(SMSG_PREFIX, cmm_smsg_target);
@@ -428,17 +462,21 @@ cmm_init (void)
rc = register_oom_notifier(&cmm_oom_nb);
if (rc < 0)
goto out_oom_notify;
+ rc = register_pm_notifier(&cmm_power_notifier);
+ if (rc)
+ goto out_pm;
init_waitqueue_head(&cmm_thread_wait);
init_timer(&cmm_timer);
cmm_thread_ptr = kthread_run(cmm_thread, NULL, "cmmthread");
rc = IS_ERR(cmm_thread_ptr) ? PTR_ERR(cmm_thread_ptr) : 0;
- if (!rc)
- goto out;
- /*
- * kthread_create failed. undo all the stuff from above again.
- */
- unregister_oom_notifier(&cmm_oom_nb);
+ if (rc)
+ goto out_kthread;
+ return 0;
+out_kthread:
+ unregister_pm_notifier(&cmm_power_notifier);
+out_pm:
+ unregister_oom_notifier(&cmm_oom_nb);
out_oom_notify:
#ifdef CONFIG_CMM_IUCV
smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
@@ -446,8 +484,8 @@ out_smsg:
#endif
#ifdef CONFIG_CMM_PROC
unregister_sysctl_table(cmm_sysctl_header);
+out_sysctl:
#endif
-out:
return rc;
}
@@ -455,6 +493,7 @@ static void
cmm_exit(void)
{
kthread_stop(cmm_thread_ptr);
+ unregister_pm_notifier(&cmm_power_notifier);
unregister_oom_notifier(&cmm_oom_nb);
cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 6d507462967..fc102e70d9c 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -34,16 +34,15 @@
#include <asm/pgtable.h>
#include <asm/s390_ext.h>
#include <asm/mmu_context.h>
+#include <asm/compat.h>
#include "../kernel/entry.h"
#ifndef CONFIG_64BIT
#define __FAIL_ADDR_MASK 0x7ffff000
-#define __FIXUP_MASK 0x7fffffff
#define __SUBCODE_MASK 0x0200
#define __PF_RES_FIELD 0ULL
#else /* CONFIG_64BIT */
#define __FAIL_ADDR_MASK -4096L
-#define __FIXUP_MASK ~0L
#define __SUBCODE_MASK 0x0600
#define __PF_RES_FIELD 0x8000000000000000ULL
#endif /* CONFIG_64BIT */
@@ -52,11 +51,15 @@
extern int sysctl_userprocess_debug;
#endif
-#ifdef CONFIG_KPROBES
-static inline int notify_page_fault(struct pt_regs *regs, long err)
+#define VM_FAULT_BADCONTEXT 0x010000
+#define VM_FAULT_BADMAP 0x020000
+#define VM_FAULT_BADACCESS 0x040000
+
+static inline int notify_page_fault(struct pt_regs *regs)
{
int ret = 0;
+#ifdef CONFIG_KPROBES
/* kprobe_running() needs smp_processor_id() */
if (!user_mode(regs)) {
preempt_disable();
@@ -64,15 +67,9 @@ static inline int notify_page_fault(struct pt_regs *regs, long err)
ret = 1;
preempt_enable();
}
-
+#endif
return ret;
}
-#else
-static inline int notify_page_fault(struct pt_regs *regs, long err)
-{
- return 0;
-}
-#endif
/*
@@ -100,57 +97,50 @@ void bust_spinlocks(int yes)
/*
* Returns the address space associated with the fault.
- * Returns 0 for kernel space, 1 for user space and
- * 2 for code execution in user space with noexec=on.
+ * Returns 0 for kernel space and 1 for user space.
*/
-static inline int check_space(struct task_struct *tsk)
+static inline int user_space_fault(unsigned long trans_exc_code)
{
/*
- * The lowest two bits of S390_lowcore.trans_exc_code
- * indicate which paging table was used.
+ * The lowest two bits of the translation exception
+ * identification indicate which paging table was used.
*/
- int desc = S390_lowcore.trans_exc_code & 3;
-
- if (desc == 3) /* Home Segment Table Descriptor */
- return switch_amode == 0;
- if (desc == 2) /* Secondary Segment Table Descriptor */
- return tsk->thread.mm_segment.ar4;
-#ifdef CONFIG_S390_SWITCH_AMODE
- if (unlikely(desc == 1)) { /* STD determined via access register */
- /* %a0 always indicates primary space. */
- if (S390_lowcore.exc_access_id != 0) {
- save_access_regs(tsk->thread.acrs);
- /*
- * An alet of 0 indicates primary space.
- * An alet of 1 indicates secondary space.
- * Any other alet values generate an
- * alen-translation exception.
- */
- if (tsk->thread.acrs[S390_lowcore.exc_access_id])
- return tsk->thread.mm_segment.ar4;
- }
- }
-#endif
- /* Primary Segment Table Descriptor */
- return switch_amode << s390_noexec;
+ trans_exc_code &= 3;
+ if (trans_exc_code == 2)
+ /* Access via secondary space, set_fs setting decides */
+ return current->thread.mm_segment.ar4;
+ if (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
+ * and access via home space is from the kernel.
+ */
+ return trans_exc_code != 3;
}
/*
* Send SIGSEGV to task. This is an external routine
* to keep the stack usage of do_page_fault small.
*/
-static void do_sigsegv(struct pt_regs *regs, unsigned long error_code,
- int si_code, unsigned long address)
+static noinline void do_sigsegv(struct pt_regs *regs, long int_code,
+ int si_code, unsigned long trans_exc_code)
{
struct siginfo si;
+ unsigned long address;
+ address = trans_exc_code & __FAIL_ADDR_MASK;
+ current->thread.prot_addr = address;
+ current->thread.trap_no = int_code;
#if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
#if defined(CONFIG_SYSCTL)
if (sysctl_userprocess_debug)
#endif
{
printk("User process fault: interruption code 0x%lX\n",
- error_code);
+ int_code);
printk("failing address: %lX\n", address);
show_regs(regs);
}
@@ -161,13 +151,14 @@ static void do_sigsegv(struct pt_regs *regs, unsigned long error_code,
force_sig_info(SIGSEGV, &si, current);
}
-static void do_no_context(struct pt_regs *regs, unsigned long error_code,
- unsigned long address)
+static noinline void do_no_context(struct pt_regs *regs, long int_code,
+ unsigned long trans_exc_code)
{
const struct exception_table_entry *fixup;
+ unsigned long address;
/* Are we prepared to handle this kernel fault? */
- fixup = search_exception_tables(regs->psw.addr & __FIXUP_MASK);
+ fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
if (fixup) {
regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
return;
@@ -177,129 +168,149 @@ static void do_no_context(struct pt_regs *regs, unsigned long error_code,
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
*/
- if (check_space(current) == 0)
+ address = trans_exc_code & __FAIL_ADDR_MASK;
+ if (!user_space_fault(trans_exc_code))
printk(KERN_ALERT "Unable to handle kernel pointer dereference"
" at virtual kernel address %p\n", (void *)address);
else
printk(KERN_ALERT "Unable to handle kernel paging request"
" at virtual user address %p\n", (void *)address);
- die("Oops", regs, error_code);
+ die("Oops", regs, int_code);
do_exit(SIGKILL);
}
-static void do_low_address(struct pt_regs *regs, unsigned long error_code)
+static noinline void do_low_address(struct pt_regs *regs, long int_code,
+ unsigned long trans_exc_code)
{
/* Low-address protection hit in kernel mode means
NULL pointer write access in kernel mode. */
if (regs->psw.mask & PSW_MASK_PSTATE) {
/* Low-address protection hit in user mode 'cannot happen'. */
- die ("Low-address protection", regs, error_code);
+ die ("Low-address protection", regs, int_code);
do_exit(SIGKILL);
}
- do_no_context(regs, error_code, 0);
+ do_no_context(regs, int_code, trans_exc_code);
}
-static void do_sigbus(struct pt_regs *regs, unsigned long error_code,
- unsigned long address)
+static noinline void do_sigbus(struct pt_regs *regs, long int_code,
+ unsigned long trans_exc_code)
{
struct task_struct *tsk = current;
- struct mm_struct *mm = tsk->mm;
- up_read(&mm->mmap_sem);
/*
* Send a sigbus, regardless of whether we were in kernel
* or user mode.
*/
- tsk->thread.prot_addr = address;
- tsk->thread.trap_no = error_code;
+ tsk->thread.prot_addr = trans_exc_code & __FAIL_ADDR_MASK;
+ tsk->thread.trap_no = int_code;
force_sig(SIGBUS, tsk);
-
- /* Kernel mode? Handle exceptions or die */
- if (!(regs->psw.mask & PSW_MASK_PSTATE))
- do_no_context(regs, error_code, address);
}
#ifdef CONFIG_S390_EXEC_PROTECT
-static int signal_return(struct mm_struct *mm, struct pt_regs *regs,
- unsigned long address, unsigned long error_code)
+static noinline int signal_return(struct pt_regs *regs, long int_code,
+ unsigned long trans_exc_code)
{
u16 instruction;
int rc;
-#ifdef CONFIG_COMPAT
- int compat;
-#endif
- pagefault_disable();
rc = __get_user(instruction, (u16 __user *) regs->psw.addr);
- pagefault_enable();
- if (rc)
- return -EFAULT;
- up_read(&mm->mmap_sem);
- clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
-#ifdef CONFIG_COMPAT
- compat = is_compat_task();
- if (compat && instruction == 0x0a77)
- sys32_sigreturn();
- else if (compat && instruction == 0x0aad)
- sys32_rt_sigreturn();
- else
-#endif
- if (instruction == 0x0a77)
- sys_sigreturn();
- else if (instruction == 0x0aad)
- sys_rt_sigreturn();
- else {
- current->thread.prot_addr = address;
- current->thread.trap_no = error_code;
- do_sigsegv(regs, error_code, SEGV_MAPERR, address);
- }
+ if (!rc && instruction == 0x0a77) {
+ clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
+ if (is_compat_task())
+ sys32_sigreturn();
+ else
+ sys_sigreturn();
+ } else if (!rc && instruction == 0x0aad) {
+ clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
+ if (is_compat_task())
+ sys32_rt_sigreturn();
+ else
+ sys_rt_sigreturn();
+ } else
+ do_sigsegv(regs, int_code, SEGV_MAPERR, trans_exc_code);
return 0;
}
#endif /* CONFIG_S390_EXEC_PROTECT */
+static noinline void do_fault_error(struct pt_regs *regs, long int_code,
+ unsigned long trans_exc_code, int fault)
+{
+ int si_code;
+
+ switch (fault) {
+ case VM_FAULT_BADACCESS:
+#ifdef CONFIG_S390_EXEC_PROTECT
+ if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_SECONDARY &&
+ (trans_exc_code & 3) == 0) {
+ signal_return(regs, int_code, trans_exc_code);
+ break;
+ }
+#endif /* CONFIG_S390_EXEC_PROTECT */
+ case VM_FAULT_BADMAP:
+ /* Bad memory access. Check if it is kernel or user space. */
+ if (regs->psw.mask & PSW_MASK_PSTATE) {
+ /* User mode accesses just cause a SIGSEGV */
+ si_code = (fault == VM_FAULT_BADMAP) ?
+ SEGV_MAPERR : SEGV_ACCERR;
+ do_sigsegv(regs, int_code, si_code, trans_exc_code);
+ return;
+ }
+ case VM_FAULT_BADCONTEXT:
+ do_no_context(regs, int_code, trans_exc_code);
+ break;
+ default: /* fault & VM_FAULT_ERROR */
+ if (fault & VM_FAULT_OOM)
+ pagefault_out_of_memory();
+ else if (fault & VM_FAULT_SIGBUS) {
+ do_sigbus(regs, int_code, trans_exc_code);
+ /* Kernel mode? Handle exceptions or die */
+ if (!(regs->psw.mask & PSW_MASK_PSTATE))
+ do_no_context(regs, int_code, trans_exc_code);
+ } else
+ BUG();
+ break;
+ }
+}
+
/*
* This routine handles page faults. It determines the address,
* and the problem, and then passes it off to one of the appropriate
* routines.
*
- * error_code:
+ * interruption code (int_code):
* 04 Protection -> Write-Protection (suprression)
* 10 Segment translation -> Not present (nullification)
* 11 Page translation -> Not present (nullification)
* 3b Region third trans. -> Not present (nullification)
*/
-static inline void
-do_exception(struct pt_regs *regs, unsigned long error_code, int write)
+static inline int do_exception(struct pt_regs *regs, int access,
+ unsigned long trans_exc_code)
{
struct task_struct *tsk;
struct mm_struct *mm;
struct vm_area_struct *vma;
unsigned long address;
- int space;
- int si_code;
int fault;
- if (notify_page_fault(regs, error_code))
- return;
+ if (notify_page_fault(regs))
+ return 0;
tsk = current;
mm = tsk->mm;
- /* get the failing address and the affected space */
- address = S390_lowcore.trans_exc_code & __FAIL_ADDR_MASK;
- space = check_space(tsk);
-
/*
* Verify that the fault happened in user space, that
* we are not in an interrupt and that there is a
* user context.
*/
- if (unlikely(space == 0 || in_atomic() || !mm))
- goto no_context;
+ fault = VM_FAULT_BADCONTEXT;
+ if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
+ goto out;
+ address = trans_exc_code & __FAIL_ADDR_MASK;
/*
* When we get here, the fault happened in the current
* task's user address space, so we can switch on the
@@ -309,42 +320,26 @@ do_exception(struct pt_regs *regs, unsigned long error_code, int write)
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
down_read(&mm->mmap_sem);
- si_code = SEGV_MAPERR;
+ fault = VM_FAULT_BADMAP;
vma = find_vma(mm, address);
if (!vma)
- goto bad_area;
-
-#ifdef CONFIG_S390_EXEC_PROTECT
- if (unlikely((space == 2) && !(vma->vm_flags & VM_EXEC)))
- if (!signal_return(mm, regs, address, error_code))
- /*
- * signal_return() has done an up_read(&mm->mmap_sem)
- * if it returns 0.
- */
- return;
-#endif
+ goto out_up;
- if (vma->vm_start <= address)
- goto good_area;
- if (!(vma->vm_flags & VM_GROWSDOWN))
- goto bad_area;
- if (expand_stack(vma, address))
- goto bad_area;
-/*
- * Ok, we have a good vm_area for this memory access, so
- * we can handle it..
- */
-good_area:
- si_code = SEGV_ACCERR;
- if (!write) {
- /* page not present, check vm flags */
- if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
- goto bad_area;
- } else {
- if (!(vma->vm_flags & VM_WRITE))
- goto bad_area;
+ if (unlikely(vma->vm_start > address)) {
+ if (!(vma->vm_flags & VM_GROWSDOWN))
+ goto out_up;
+ if (expand_stack(vma, address))
+ goto out_up;
}
+ /*
+ * Ok, we have a good vm_area for this memory access, so
+ * we can handle it..
+ */
+ fault = VM_FAULT_BADACCESS;
+ if (unlikely(!(vma->vm_flags & access)))
+ goto out_up;
+
if (is_vm_hugetlb_page(vma))
address &= HPAGE_MASK;
/*
@@ -352,18 +347,11 @@ good_area:
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
- fault = handle_mm_fault(mm, vma, address, write ? FAULT_FLAG_WRITE : 0);
- if (unlikely(fault & VM_FAULT_ERROR)) {
- if (fault & VM_FAULT_OOM) {
- up_read(&mm->mmap_sem);
- pagefault_out_of_memory();
- return;
- } else if (fault & VM_FAULT_SIGBUS) {
- do_sigbus(regs, error_code, address);
- return;
- }
- BUG();
- }
+ fault = handle_mm_fault(mm, vma, address,
+ (access == VM_WRITE) ? FAULT_FLAG_WRITE : 0);
+ if (unlikely(fault & VM_FAULT_ERROR))
+ goto out_up;
+
if (fault & VM_FAULT_MAJOR) {
tsk->maj_flt++;
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0,
@@ -373,74 +361,69 @@ good_area:
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0,
regs, address);
}
- up_read(&mm->mmap_sem);
/*
* The instruction that caused the program check will
* be repeated. Don't signal single step via SIGTRAP.
*/
clear_tsk_thread_flag(tsk, TIF_SINGLE_STEP);
- return;
-
-/*
- * Something tried to access memory that isn't in our memory map..
- * Fix it, but check if it's kernel or user first..
- */
-bad_area:
+ fault = 0;
+out_up:
up_read(&mm->mmap_sem);
-
- /* User mode accesses just cause a SIGSEGV */
- if (regs->psw.mask & PSW_MASK_PSTATE) {
- tsk->thread.prot_addr = address;
- tsk->thread.trap_no = error_code;
- do_sigsegv(regs, error_code, si_code, address);
- return;
- }
-
-no_context:
- do_no_context(regs, error_code, address);
+out:
+ return fault;
}
-void __kprobes do_protection_exception(struct pt_regs *regs,
- long error_code)
+void __kprobes do_protection_exception(struct pt_regs *regs, long int_code)
{
+ unsigned long trans_exc_code = S390_lowcore.trans_exc_code;
+ int fault;
+
/* Protection exception is supressing, decrement psw address. */
- regs->psw.addr -= (error_code >> 16);
+ regs->psw.addr -= (int_code >> 16);
/*
* Check for low-address protection. This needs to be treated
* as a special case because the translation exception code
* field is not guaranteed to contain valid data in this case.
*/
- if (unlikely(!(S390_lowcore.trans_exc_code & 4))) {
- do_low_address(regs, error_code);
+ if (unlikely(!(trans_exc_code & 4))) {
+ do_low_address(regs, int_code, trans_exc_code);
return;
}
- do_exception(regs, 4, 1);
+ fault = do_exception(regs, VM_WRITE, trans_exc_code);
+ if (unlikely(fault))
+ do_fault_error(regs, 4, trans_exc_code, fault);
}
-void __kprobes do_dat_exception(struct pt_regs *regs, long error_code)
+void __kprobes do_dat_exception(struct pt_regs *regs, long int_code)
{
- do_exception(regs, error_code & 0xff, 0);
+ unsigned long trans_exc_code = S390_lowcore.trans_exc_code;
+ int access, fault;
+
+ access = VM_READ | VM_EXEC | VM_WRITE;
+#ifdef CONFIG_S390_EXEC_PROTECT
+ if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_SECONDARY &&
+ (trans_exc_code & 3) == 0)
+ access = VM_EXEC;
+#endif
+ fault = do_exception(regs, access, trans_exc_code);
+ if (unlikely(fault))
+ do_fault_error(regs, int_code & 255, trans_exc_code, fault);
}
#ifdef CONFIG_64BIT
-void __kprobes do_asce_exception(struct pt_regs *regs, unsigned long error_code)
+void __kprobes do_asce_exception(struct pt_regs *regs, long int_code)
{
- struct mm_struct *mm;
+ unsigned long trans_exc_code = S390_lowcore.trans_exc_code;
+ struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
- unsigned long address;
- int space;
-
- mm = current->mm;
- address = S390_lowcore.trans_exc_code & __FAIL_ADDR_MASK;
- space = check_space(current);
- if (unlikely(space == 0 || in_atomic() || !mm))
+ if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
goto no_context;
local_irq_enable();
down_read(&mm->mmap_sem);
- vma = find_vma(mm, address);
+ vma = find_vma(mm, trans_exc_code & __FAIL_ADDR_MASK);
up_read(&mm->mmap_sem);
if (vma) {
@@ -450,17 +433,38 @@ void __kprobes do_asce_exception(struct pt_regs *regs, unsigned long error_code)
/* User mode accesses just cause a SIGSEGV */
if (regs->psw.mask & PSW_MASK_PSTATE) {
- current->thread.prot_addr = address;
- current->thread.trap_no = error_code;
- do_sigsegv(regs, error_code, SEGV_MAPERR, address);
+ do_sigsegv(regs, int_code, SEGV_MAPERR, trans_exc_code);
return;
}
no_context:
- do_no_context(regs, error_code, address);
+ do_no_context(regs, int_code, trans_exc_code);
}
#endif
+int __handle_fault(unsigned long uaddr, unsigned long int_code, int write_user)
+{
+ struct pt_regs regs;
+ int access, fault;
+
+ regs.psw.mask = psw_kernel_bits;
+ 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;
+ uaddr &= PAGE_MASK;
+ access = write_user ? VM_WRITE : VM_READ;
+ fault = do_exception(&regs, access, uaddr | 2);
+ if (unlikely(fault)) {
+ if (fault & VM_FAULT_OOM) {
+ pagefault_out_of_memory();
+ fault = 0;
+ } else if (fault & VM_FAULT_SIGBUS)
+ do_sigbus(&regs, int_code, uaddr);
+ }
+ return fault ? -EFAULT : 0;
+}
+
#ifdef CONFIG_PFAULT
/*
* 'pfault' pseudo page faults routines.
@@ -522,7 +526,7 @@ void pfault_fini(void)
: : "a" (&refbk), "m" (refbk) : "cc");
}
-static void pfault_interrupt(__u16 error_code)
+static void pfault_interrupt(__u16 int_code)
{
struct task_struct *tsk;
__u16 subcode;
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 2757c5616a0..ad621e06ada 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -269,7 +269,7 @@ int s390_enable_sie(void)
struct mm_struct *mm, *old_mm;
/* Do we have switched amode? If no, we cannot do sie */
- if (!switch_amode)
+ if (user_mode == HOME_SPACE_MODE)
return -EINVAL;
/* Do we have pgstes? if yes, we are done */
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 5f91a38d759..300ab012b0f 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -70,8 +70,12 @@ static pte_t __ref *vmem_pte_alloc(void)
pte = alloc_bootmem(PTRS_PER_PTE * sizeof(pte_t));
if (!pte)
return NULL;
- clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY,
- PTRS_PER_PTE * sizeof(pte_t));
+ if (MACHINE_HAS_HPAGE)
+ clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY | _PAGE_CO,
+ PTRS_PER_PTE * sizeof(pte_t));
+ else
+ clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY,
+ PTRS_PER_PTE * sizeof(pte_t));
return pte;
}
@@ -112,7 +116,8 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
if (MACHINE_HAS_HPAGE && !(address & ~HPAGE_MASK) &&
(address + HPAGE_SIZE <= start + size) &&
(address >= HPAGE_SIZE)) {
- pte_val(pte) |= _SEGMENT_ENTRY_LARGE;
+ pte_val(pte) |= _SEGMENT_ENTRY_LARGE |
+ _SEGMENT_ENTRY_CO;
pmd_val(*pm_dir) = pte_val(pte);
address += HPAGE_SIZE - PAGE_SIZE;
continue;