/* * Stack dumping functions * * Copyright IBM Corp. 1999, 2013 */ #include #include #include #include #include #include #include #include #include #include #include #include #ifndef CONFIG_64BIT #define LONG "%08lx " #define FOURLONG "%08lx %08lx %08lx %08lx\n" static int kstack_depth_to_print = 12; #else /* CONFIG_64BIT */ #define LONG "%016lx " #define FOURLONG "%016lx %016lx %016lx %016lx\n" static int kstack_depth_to_print = 20; #endif /* CONFIG_64BIT */ /* * For show_trace we have tree different stack to consider: * - the panic stack which is used if the kernel stack has overflown * - the asynchronous interrupt stack (cpu related) * - the synchronous kernel stack (process related) * The stack trace can start at any of the three stack and can potentially * touch all of them. The order is: panic stack, async stack, sync stack. */ static unsigned long __show_trace(unsigned long sp, unsigned long low, unsigned long high) { struct stack_frame *sf; struct pt_regs *regs; while (1) { sp = sp & PSW_ADDR_INSN; if (sp < low || sp > high - sizeof(*sf)) return sp; sf = (struct stack_frame *) sp; printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN); /* Follow the backchain. */ while (1) { low = sp; sp = sf->back_chain & PSW_ADDR_INSN; if (!sp) break; if (sp <= low || sp > high - sizeof(*sf)) return sp; sf = (struct stack_frame *) sp; printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN); print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN); } /* Zero backchain detected, check for interrupt frame. */ sp = (unsigned long) (sf + 1); if (sp <= low || sp > high - sizeof(*regs)) return sp; regs = (struct pt_regs *) sp; printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN); print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN); low = sp; sp = regs->gprs[15]; } } static void show_trace(struct task_struct *task, unsigned long *stack) { register unsigned long __r15 asm ("15"); unsigned long sp; sp = (unsigned long) stack; if (!sp) sp = task ? task->thread.ksp : __r15; printk("Call Trace:\n"); #ifdef CONFIG_CHECK_STACK sp = __show_trace(sp, S390_lowcore.panic_stack - 4096, S390_lowcore.panic_stack); #endif sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE, S390_lowcore.async_stack); if (task) __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); if (!task) task = current; debug_show_held_locks(task); } void show_stack(struct task_struct *task, unsigned long *sp) { register unsigned long *__r15 asm ("15"); unsigned long *stack; int i; if (!sp) stack = task ? (unsigned long *) task->thread.ksp : __r15; else stack = sp; for (i = 0; i < kstack_depth_to_print; i++) { if (((addr_t) stack & (THREAD_SIZE-1)) == 0) break; if ((i * sizeof(long) % 32) == 0) printk("%s ", i == 0 ? "" : "\n"); printk(LONG, *stack++); } printk("\n"); show_trace(task, sp); } static void show_last_breaking_event(struct pt_regs *regs) { #ifdef CONFIG_64BIT printk("Last Breaking-Event-Address:\n"); printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN); print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN); #endif } static inline int mask_bits(struct pt_regs *regs, unsigned long bits) { return (regs->psw.mask & bits) / ((~bits + 1) & bits); } void show_registers(struct pt_regs *regs) { char *mode; mode = user_mode(regs) ? "User" : "Krnl"; printk("%s PSW : %p %p", mode, (void *) regs->psw.mask, (void *) regs->psw.addr); print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN); printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x " "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER), mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO), mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY), mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT), mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC), mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM)); #ifdef CONFIG_64BIT printk(" EA:%x", mask_bits(regs, PSW_MASK_EA | PSW_MASK_BA)); #endif printk("\n%s GPRS: " FOURLONG, mode, regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]); printk(" " FOURLONG, regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]); printk(" " FOURLONG, regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]); printk(" " FOURLONG, regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]); show_code(regs); } void show_regs(struct pt_regs *regs) { printk("CPU: %d %s %s %.*s\n", task_thread_info(current)->cpu, print_tainted(), init_utsname()->release, (int)strcspn(init_utsname()->version, " "), init_utsname()->version); printk("Process %s (pid: %d, task: %p, ksp: %p)\n", current->comm, current->pid, current, (void *) current->thread.ksp); show_registers(regs); /* Show stack backtrace if pt_regs is from kernel mode */ if (!user_mode(regs)) show_trace(NULL, (unsigned long *) regs->gprs[15]); show_last_breaking_event(regs); } static DEFINE_SPINLOCK(die_lock); void die(struct pt_regs *regs, const char *str) { static int die_counter; oops_enter(); lgr_info_log(); debug_stop_all(); console_verbose(); spin_lock_irq(&die_lock); bust_spinlocks(1); printk("%s: %04x [#%d] ", str, regs->int_code & 0xffff, ++die_counter); #ifdef CONFIG_PREEMPT printk("PREEMPT "); #endif #ifdef CONFIG_SMP printk("SMP "); #endif #ifdef CONFIG_DEBUG_PAGEALLOC printk("DEBUG_PAGEALLOC"); #endif printk("\n"); notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV); print_modules(); show_regs(regs); bust_spinlocks(0); add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irq(&die_lock); if (in_interrupt()) panic("Fatal exception in interrupt"); if (panic_on_oops) panic("Fatal exception: panic_on_oops"); oops_exit(); do_exit(SIGSEGV); }