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Diffstat (limited to 'arch/s390/mm/fault.c')
-rw-r--r--arch/s390/mm/fault.c77
1 files changed, 46 insertions, 31 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 2505b2ea0ef..fe5701e9efb 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -52,6 +52,14 @@
#define VM_FAULT_BADMAP 0x020000
#define VM_FAULT_BADACCESS 0x040000
+static unsigned long store_indication;
+
+void fault_init(void)
+{
+ if (test_facility(2) && test_facility(75))
+ store_indication = 0xc00;
+}
+
static inline int notify_page_fault(struct pt_regs *regs)
{
int ret = 0;
@@ -199,14 +207,21 @@ static noinline void do_sigbus(struct pt_regs *regs, long int_code,
unsigned long trans_exc_code)
{
struct task_struct *tsk = current;
+ unsigned long address;
+ struct siginfo si;
/*
* Send a sigbus, regardless of whether we were in kernel
* or user mode.
*/
- tsk->thread.prot_addr = trans_exc_code & __FAIL_ADDR_MASK;
+ address = trans_exc_code & __FAIL_ADDR_MASK;
+ tsk->thread.prot_addr = address;
tsk->thread.trap_no = int_code;
- force_sig(SIGBUS, tsk);
+ si.si_signo = SIGBUS;
+ si.si_errno = 0;
+ si.si_code = BUS_ADRERR;
+ si.si_addr = (void __user *) address;
+ force_sig_info(SIGBUS, &si, tsk);
}
#ifdef CONFIG_S390_EXEC_PROTECT
@@ -266,10 +281,11 @@ static noinline void do_fault_error(struct pt_regs *regs, long int_code,
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
+ do_sigbus(regs, int_code, trans_exc_code);
} else
BUG();
break;
@@ -294,7 +310,7 @@ static inline int do_exception(struct pt_regs *regs, int access,
struct mm_struct *mm;
struct vm_area_struct *vma;
unsigned long address;
- int fault;
+ int fault, write;
if (notify_page_fault(regs))
return 0;
@@ -312,12 +328,6 @@ static inline int do_exception(struct pt_regs *regs, int access,
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
- * interrupts again and then search the VMAs
- */
- local_irq_enable();
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
down_read(&mm->mmap_sem);
@@ -348,8 +358,10 @@ static inline int do_exception(struct pt_regs *regs, int access,
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
- fault = handle_mm_fault(mm, vma, address,
- (access == VM_WRITE) ? FAULT_FLAG_WRITE : 0);
+ write = (access == VM_WRITE ||
+ (trans_exc_code & store_indication) == 0x400) ?
+ FAULT_FLAG_WRITE : 0;
+ fault = handle_mm_fault(mm, vma, address, write);
if (unlikely(fault & VM_FAULT_ERROR))
goto out_up;
@@ -374,20 +386,20 @@ out:
return fault;
}
-void __kprobes do_protection_exception(struct pt_regs *regs, long int_code)
+void __kprobes do_protection_exception(struct pt_regs *regs, long pgm_int_code,
+ unsigned long trans_exc_code)
{
- unsigned long trans_exc_code = S390_lowcore.trans_exc_code;
int fault;
/* Protection exception is supressing, decrement psw address. */
- regs->psw.addr -= (int_code >> 16);
+ regs->psw.addr -= (pgm_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(!(trans_exc_code & 4))) {
- do_low_address(regs, int_code, trans_exc_code);
+ do_low_address(regs, pgm_int_code, trans_exc_code);
return;
}
fault = do_exception(regs, VM_WRITE, trans_exc_code);
@@ -395,9 +407,9 @@ void __kprobes do_protection_exception(struct pt_regs *regs, long int_code)
do_fault_error(regs, 4, trans_exc_code, fault);
}
-void __kprobes do_dat_exception(struct pt_regs *regs, long int_code)
+void __kprobes do_dat_exception(struct pt_regs *regs, long pgm_int_code,
+ unsigned long trans_exc_code)
{
- unsigned long trans_exc_code = S390_lowcore.trans_exc_code;
int access, fault;
access = VM_READ | VM_EXEC | VM_WRITE;
@@ -408,21 +420,19 @@ void __kprobes do_dat_exception(struct pt_regs *regs, long int_code)
#endif
fault = do_exception(regs, access, trans_exc_code);
if (unlikely(fault))
- do_fault_error(regs, int_code & 255, trans_exc_code, fault);
+ do_fault_error(regs, pgm_int_code & 255, trans_exc_code, fault);
}
#ifdef CONFIG_64BIT
-void __kprobes do_asce_exception(struct pt_regs *regs, long int_code)
+void __kprobes do_asce_exception(struct pt_regs *regs, long pgm_int_code,
+ unsigned long trans_exc_code)
{
- unsigned long trans_exc_code = S390_lowcore.trans_exc_code;
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
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, trans_exc_code & __FAIL_ADDR_MASK);
up_read(&mm->mmap_sem);
@@ -434,16 +444,16 @@ void __kprobes do_asce_exception(struct pt_regs *regs, long int_code)
/* User mode accesses just cause a SIGSEGV */
if (regs->psw.mask & PSW_MASK_PSTATE) {
- do_sigsegv(regs, int_code, SEGV_MAPERR, trans_exc_code);
+ do_sigsegv(regs, pgm_int_code, SEGV_MAPERR, trans_exc_code);
return;
}
no_context:
- do_no_context(regs, int_code, trans_exc_code);
+ do_no_context(regs, pgm_int_code, trans_exc_code);
}
#endif
-int __handle_fault(unsigned long uaddr, unsigned long int_code, int write_user)
+int __handle_fault(unsigned long uaddr, unsigned long pgm_int_code, int write)
{
struct pt_regs regs;
int access, fault;
@@ -454,14 +464,14 @@ int __handle_fault(unsigned long uaddr, unsigned long int_code, int write_user)
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;
+ access = write ? 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);
+ do_sigbus(&regs, pgm_int_code, uaddr);
}
return fault ? -EFAULT : 0;
}
@@ -527,7 +537,8 @@ void pfault_fini(void)
: : "a" (&refbk), "m" (refbk) : "cc");
}
-static void pfault_interrupt(__u16 int_code)
+static void pfault_interrupt(unsigned int ext_int_code,
+ unsigned int param32, unsigned long param64)
{
struct task_struct *tsk;
__u16 subcode;
@@ -538,14 +549,18 @@ static void pfault_interrupt(__u16 int_code)
* in the 'cpu address' field associated with the
* external interrupt.
*/
- subcode = S390_lowcore.cpu_addr;
+ subcode = ext_int_code >> 16;
if ((subcode & 0xff00) != __SUBCODE_MASK)
return;
/*
* Get the token (= address of the task structure of the affected task).
*/
- tsk = *(struct task_struct **) __LC_PFAULT_INTPARM;
+#ifdef CONFIG_64BIT
+ tsk = *(struct task_struct **) param64;
+#else
+ tsk = *(struct task_struct **) param32;
+#endif
if (subcode & 0x0080) {
/* signal bit is set -> a page has been swapped in by VM */
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 13:16:59 +0000