diff options
Diffstat (limited to 'arch/s390/kernel/traps.c')
| -rw-r--r-- | arch/s390/kernel/traps.c | 61 |
1 files changed, 41 insertions, 20 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index a46793beedd..3eb4fab048b 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -14,7 +14,6 @@ * '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> @@ -30,6 +29,7 @@ #include <linux/module.h> #include <linux/kallsyms.h> #include <linux/reboot.h> +#include <linux/kprobes.h> #include <asm/system.h> #include <asm/uaccess.h> @@ -40,6 +40,7 @@ #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); @@ -75,6 +76,20 @@ static int kstack_depth_to_print = 12; static int kstack_depth_to_print = 20; #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: * - the panic stack which is used if the kernel stack has overflown @@ -150,13 +165,11 @@ 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; @@ -173,7 +186,7 @@ void show_stack(struct task_struct *task, unsigned long *sp) */ void dump_stack(void) { - show_stack(0, 0); + show_stack(NULL, NULL); } EXPORT_SYMBOL(dump_stack); @@ -308,8 +321,9 @@ report_user_fault(long interruption_code, struct pt_regs *regs) #endif } -static void inline do_trap(long interruption_code, int signr, char *str, - struct pt_regs *regs, siginfo_t *info) +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 @@ -318,6 +332,10 @@ static void inline do_trap(long interruption_code, int signr, char *str, 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; @@ -334,13 +352,17 @@ static void inline do_trap(long interruption_code, int signr, char *str, } } -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 (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, + SIGTRAP) == NOTIFY_STOP){ + return; + } if ((current->ptrace & PT_PTRACED) != 0) force_sig(SIGTRAP, current); } @@ -363,7 +385,7 @@ asmlinkage void name(struct pt_regs * regs, long interruption_code) \ 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); \ } @@ -395,7 +417,7 @@ DO_ERROR_INFO(SIGILL, "translation exception", translation_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; @@ -427,10 +449,10 @@ 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 @@ -562,10 +584,10 @@ DO_ERROR_INFO(SIGILL, "specification exception", specification_exception, 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 @@ -575,8 +597,7 @@ asmlinkage void data_exception(struct pt_regs * regs, long interruption_code) 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) { |