* 'Traps.c' handles hardware traps and faults after we have saved some
* state in 'asm.s'.
*/
-#include <linux/config.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
-#include <linux/ptrace.h>
+#include <linux/tracehook.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
+#include <linux/reboot.h>
+#include <linux/kprobes.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/cpcmd.h>
#include <asm/s390_ext.h>
#include <asm/lowcore.h>
+#include <asm/debug.h>
+#include <asm/kdebug.h>
/* Called from entry.S only */
extern void handle_per_exception(struct pt_regs *regs);
extern pgm_check_handler_t do_protection_exception;
extern pgm_check_handler_t do_dat_exception;
-extern pgm_check_handler_t do_pseudo_page_fault;
-#ifdef CONFIG_PFAULT
-extern int pfault_init(void);
-extern void pfault_fini(void);
-extern void pfault_interrupt(struct pt_regs *regs, __u16 error_code);
-static ext_int_info_t ext_int_pfault;
-#endif
extern pgm_check_handler_t do_monitor_call;
#define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
-#ifndef CONFIG_ARCH_S390X
+#ifndef CONFIG_64BIT
#define FOURLONG "%08lx %08lx %08lx %08lx\n"
static int kstack_depth_to_print = 12;
-#else /* CONFIG_ARCH_S390X */
+#else /* CONFIG_64BIT */
#define FOURLONG "%016lx %016lx %016lx %016lx\n"
static int kstack_depth_to_print = 20;
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
+
+ATOMIC_NOTIFIER_HEAD(s390die_chain);
+
+int register_die_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&s390die_chain, nb);
+}
+EXPORT_SYMBOL(register_die_notifier);
+
+int unregister_die_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&s390die_chain, nb);
+}
+EXPORT_SYMBOL(unregister_die_notifier);
/*
* For show_trace we have tree different stack to consider:
}
}
-void show_trace(struct task_struct *task, unsigned long * stack)
+void show_trace(struct task_struct *task, unsigned long *stack)
{
register unsigned long __r15 asm ("15");
unsigned long sp;
sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
S390_lowcore.async_stack);
if (task)
- __show_trace(sp, (unsigned long) task->thread_info,
- (unsigned long) task->thread_info + THREAD_SIZE);
+ __show_trace(sp, (unsigned long) task_stack_page(task),
+ (unsigned long) task_stack_page(task) + THREAD_SIZE);
else
__show_trace(sp, S390_lowcore.thread_info,
S390_lowcore.thread_info + THREAD_SIZE);
printk("\n");
+ if (!task)
+ task = current;
+ debug_show_held_locks(task);
}
void show_stack(struct task_struct *task, unsigned long *sp)
unsigned long *stack;
int i;
- // debugging aid: "show_stack(NULL);" prints the
- // back trace for this cpu.
-
if (!sp)
- sp = task ? (unsigned long *) task->thread.ksp : __r15;
+ stack = task ? (unsigned long *) task->thread.ksp : __r15;
+ else
+ stack = sp;
- stack = sp;
for (i = 0; i < kstack_depth_to_print; i++) {
if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
break;
*/
void dump_stack(void)
{
- show_stack(0, 0);
+ show_stack(NULL, NULL);
}
EXPORT_SYMBOL(dump_stack);
{
struct pt_regs *regs;
- regs = __KSTK_PTREGS(task);
+ regs = task_pt_regs(task);
buffer += sprintf(buffer, "task: %p, ksp: %p\n",
task, (void *)task->thread.ksp);
buffer += sprintf(buffer, "User PSW : %p %p\n",
return buffer;
}
-spinlock_t die_lock = SPIN_LOCK_UNLOCKED;
+DEFINE_SPINLOCK(die_lock);
void die(const char * str, struct pt_regs * regs, long err)
{
static int die_counter;
- console_verbose();
- spin_lock_irq(&die_lock);
+
+ debug_stop_all();
+ console_verbose();
+ spin_lock_irq(&die_lock);
bust_spinlocks(1);
printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
show_regs(regs);
do_exit(SIGSEGV);
}
-static void inline do_trap(long interruption_code, int signr, char *str,
- struct pt_regs *regs, siginfo_t *info)
+static void inline
+report_user_fault(long interruption_code, struct pt_regs *regs)
+{
+#if defined(CONFIG_SYSCTL)
+ if (!sysctl_userprocess_debug)
+ return;
+#endif
+#if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
+ printk("User process fault: interruption code 0x%lX\n",
+ interruption_code);
+ show_regs(regs);
+#endif
+}
+
+static void __kprobes inline do_trap(long interruption_code, int signr,
+ char *str, struct pt_regs *regs,
+ siginfo_t *info)
{
/*
* We got all needed information from the lowcore and can
if (regs->psw.mask & PSW_MASK_PSTATE)
local_irq_enable();
+ if (notify_die(DIE_TRAP, str, regs, interruption_code,
+ interruption_code, signr) == NOTIFY_STOP)
+ return;
+
if (regs->psw.mask & PSW_MASK_PSTATE) {
struct task_struct *tsk = current;
tsk->thread.trap_no = interruption_code & 0xffff;
- if (info)
- force_sig_info(signr, info, tsk);
- else
- force_sig(signr, tsk);
-#ifndef CONFIG_SYSCTL
-#ifdef CONFIG_PROCESS_DEBUG
- printk("User process fault: interruption code 0x%lX\n",
- interruption_code);
- show_regs(regs);
-#endif
-#else
- if (sysctl_userprocess_debug) {
- printk("User process fault: interruption code 0x%lX\n",
- interruption_code);
- show_regs(regs);
- }
-#endif
+ force_sig_info(signr, info, tsk);
+ report_user_fault(interruption_code, regs);
} else {
const struct exception_table_entry *fixup;
fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
}
}
-static inline void *get_check_address(struct pt_regs *regs)
+static inline void __user *get_check_address(struct pt_regs *regs)
{
- return (void *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
+ return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
}
-void do_single_step(struct pt_regs *regs)
+void __kprobes do_single_step(struct pt_regs *regs)
{
- if ((current->ptrace & PT_PTRACED) != 0)
+ if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
+ SIGTRAP) == NOTIFY_STOP){
+ return;
+ }
+ if (tracehook_consider_fatal_signal(current, SIGTRAP))
force_sig(SIGTRAP, current);
}
-#define DO_ERROR(signr, str, name) \
-asmlinkage void name(struct pt_regs * regs, long interruption_code) \
-{ \
- do_trap(interruption_code, signr, str, regs, NULL); \
+asmlinkage void
+default_trap_handler(struct pt_regs * regs, long interruption_code)
+{
+ if (regs->psw.mask & PSW_MASK_PSTATE) {
+ local_irq_enable();
+ do_exit(SIGSEGV);
+ report_user_fault(interruption_code, regs);
+ } else
+ die("Unknown program exception", regs, interruption_code);
}
#define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
- info.si_addr = (void *)siaddr; \
+ info.si_addr = siaddr; \
do_trap(interruption_code, signr, str, regs, &info); \
}
-DO_ERROR(SIGSEGV, "Unknown program exception", default_trap_handler)
-
DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
ILL_ILLADR, get_check_address(regs))
DO_ERROR_INFO(SIGILL, "execute exception", execute_exception,
ILL_ILLOPN, get_check_address(regs))
static inline void
-do_fp_trap(struct pt_regs *regs, void *location,
+do_fp_trap(struct pt_regs *regs, void __user *location,
int fpc, long interruption_code)
{
siginfo_t si;
asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code)
{
+ siginfo_t info;
__u8 opcode[6];
- __u16 *location;
+ __u16 __user *location;
int signal = 0;
- location = (__u16 *) get_check_address(regs);
+ location = get_check_address(regs);
/*
* We got all needed information from the lowcore and can
local_irq_enable();
if (regs->psw.mask & PSW_MASK_PSTATE) {
- get_user(*((__u16 *) opcode), (__u16 __user *) location);
+ if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
+ return;
if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
- if (current->ptrace & PT_PTRACED)
+ if (tracehook_consider_fatal_signal(current, SIGTRAP))
force_sig(SIGTRAP, current);
else
signal = SIGILL;
#ifdef CONFIG_MATHEMU
} else if (opcode[0] == 0xb3) {
- get_user(*((__u16 *) (opcode+2)), location+1);
+ if (get_user(*((__u16 *) (opcode+2)), location+1))
+ return;
signal = math_emu_b3(opcode, regs);
} else if (opcode[0] == 0xed) {
- get_user(*((__u32 *) (opcode+2)),
- (__u32 *)(location+1));
+ if (get_user(*((__u32 *) (opcode+2)),
+ (__u32 __user *)(location+1)))
+ return;
signal = math_emu_ed(opcode, regs);
} else if (*((__u16 *) opcode) == 0xb299) {
- get_user(*((__u16 *) (opcode+2)), location+1);
+ if (get_user(*((__u16 *) (opcode+2)), location+1))
+ return;
signal = math_emu_srnm(opcode, regs);
} else if (*((__u16 *) opcode) == 0xb29c) {
- get_user(*((__u16 *) (opcode+2)), location+1);
+ if (get_user(*((__u16 *) (opcode+2)), location+1))
+ return;
signal = math_emu_stfpc(opcode, regs);
} else if (*((__u16 *) opcode) == 0xb29d) {
- get_user(*((__u16 *) (opcode+2)), location+1);
+ if (get_user(*((__u16 *) (opcode+2)), location+1))
+ return;
signal = math_emu_lfpc(opcode, regs);
#endif
} else
} else
signal = SIGILL;
+#ifdef CONFIG_MATHEMU
if (signal == SIGFPE)
do_fp_trap(regs, location,
current->thread.fp_regs.fpc, interruption_code);
- else if (signal)
+ else if (signal == SIGSEGV) {
+ info.si_signo = signal;
+ info.si_errno = 0;
+ info.si_code = SEGV_MAPERR;
+ info.si_addr = (void __user *) location;
+ do_trap(interruption_code, signal,
+ "user address fault", regs, &info);
+ } else
+#endif
+ if (signal) {
+ info.si_signo = signal;
+ info.si_errno = 0;
+ info.si_code = ILL_ILLOPC;
+ info.si_addr = (void __user *) location;
do_trap(interruption_code, signal,
- "illegal operation", regs, NULL);
+ "illegal operation", regs, &info);
+ }
}
specification_exception(struct pt_regs * regs, long interruption_code)
{
__u8 opcode[6];
- __u16 *location = NULL;
+ __u16 __user *location = NULL;
int signal = 0;
- location = (__u16 *) get_check_address(regs);
+ location = (__u16 __user *) get_check_address(regs);
/*
* We got all needed information from the lowcore and can
asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
{
- __u16 *location;
+ __u16 __user *location;
int signal = 0;
- location = (__u16 *) get_check_address(regs);
+ location = get_check_address(regs);
/*
* We got all needed information from the lowcore and can
local_irq_enable();
if (MACHINE_HAS_IEEE)
- __asm__ volatile ("stfpc %0\n\t"
- : "=m" (current->thread.fp_regs.fpc));
+ asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
#ifdef CONFIG_MATHEMU
else if (regs->psw.mask & PSW_MASK_PSTATE) {
break;
case 0xed:
get_user(*((__u32 *) (opcode+2)),
- (__u32 *)(location+1));
+ (__u32 __user *)(location+1));
signal = math_emu_ed(opcode, regs);
break;
case 0xb2:
}
}
+asmlinkage void space_switch_exception(struct pt_regs * regs, long int_code)
+{
+ siginfo_t info;
+
+ /* Set user psw back to home space mode. */
+ if (regs->psw.mask & PSW_MASK_PSTATE)
+ regs->psw.mask |= PSW_ASC_HOME;
+ /* Send SIGILL. */
+ info.si_signo = SIGILL;
+ info.si_errno = 0;
+ info.si_code = ILL_PRVOPC;
+ info.si_addr = get_check_address(regs);
+ do_trap(int_code, SIGILL, "space switch event", regs, &info);
+}
+
asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
{
- die("Kernel stack overflow", regs, 0);
+ bust_spinlocks(1);
+ printk("Kernel stack overflow.\n");
+ show_regs(regs);
+ bust_spinlocks(0);
panic("Corrupt kernel stack, can't continue.");
}
-
/* init is done in lowcore.S and head.S */
void __init trap_init(void)
pgm_check_table[0x11] = &do_dat_exception;
pgm_check_table[0x12] = &translation_exception;
pgm_check_table[0x13] = &special_op_exception;
-#ifndef CONFIG_ARCH_S390X
- pgm_check_table[0x14] = &do_pseudo_page_fault;
-#else /* CONFIG_ARCH_S390X */
+#ifdef CONFIG_64BIT
pgm_check_table[0x38] = &do_dat_exception;
pgm_check_table[0x39] = &do_dat_exception;
pgm_check_table[0x3A] = &do_dat_exception;
pgm_check_table[0x3B] = &do_dat_exception;
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
pgm_check_table[0x15] = &operand_exception;
- pgm_check_table[0x1C] = &privileged_op;
+ pgm_check_table[0x1C] = &space_switch_exception;
pgm_check_table[0x1D] = &hfp_sqrt_exception;
pgm_check_table[0x40] = &do_monitor_call;
-
- if (MACHINE_IS_VM) {
- /*
- * First try to get pfault pseudo page faults going.
- * If this isn't available turn on pagex page faults.
- */
-#ifdef CONFIG_PFAULT
- /* request the 0x2603 external interrupt */
- if (register_early_external_interrupt(0x2603, pfault_interrupt,
- &ext_int_pfault) != 0)
- panic("Couldn't request external interrupt 0x2603");
-
- if (pfault_init() == 0)
- return;
-
- /* Tough luck, no pfault. */
- unregister_early_external_interrupt(0x2603, pfault_interrupt,
- &ext_int_pfault);
-#endif
-#ifndef CONFIG_ARCH_S390X
- cpcmd("SET PAGEX ON", NULL, 0);
-#endif
- }
+ pfault_irq_init();
}
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