#define __PF_RES_FIELD 0x8000000000000000ULL
#endif /* CONFIG_64BIT */
-#ifdef CONFIG_SYSCTL
-extern int sysctl_userprocess_debug;
-#endif
-
#define VM_FAULT_BADCONTEXT 0x010000
#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;
return trans_exc_code != 3;
}
+static inline void report_user_fault(struct pt_regs *regs, long int_code,
+ int signr, unsigned long address)
+{
+ if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
+ return;
+ if (!unhandled_signal(current, signr))
+ return;
+ if (!printk_ratelimit())
+ return;
+ printk("User process fault: interruption code 0x%lX ", int_code);
+ print_vma_addr(KERN_CONT "in ", regs->psw.addr & PSW_ADDR_INSN);
+ printk("\n");
+ printk("failing address: %lX\n", address);
+ show_regs(regs);
+}
+
/*
* Send SIGSEGV to task. This is an external routine
* to keep the stack usage of do_page_fault small.
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",
- int_code);
- printk("failing address: %lX\n", address);
- show_regs(regs);
- }
-#endif
+ report_user_fault(regs, int_code, SIGSEGV, address);
si.si_signo = SIGSEGV;
si.si_code = si_code;
si.si_addr = (void __user *) address;
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
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;
struct mm_struct *mm;
struct vm_area_struct *vma;
unsigned long address;
- int fault;
+ int fault, write;
if (notify_page_fault(regs))
return 0;
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);
* 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;
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);
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;
#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);
/* 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;
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(®s, 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(®s, int_code, uaddr);
+ do_sigbus(®s, pgm_int_code, uaddr);
}
return fault ? -EFAULT : 0;
}
: : "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;
* 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 */
git.openpandora.org / pandora-kernel.git / blobdiff