| /* |
| * Stack dumping functions |
| * |
| * Copyright IBM Corp. 1999, 2013 |
| */ |
| |
| #include <linux/kallsyms.h> |
| #include <linux/hardirq.h> |
| #include <linux/kprobes.h> |
| #include <linux/utsname.h> |
| #include <linux/export.h> |
| #include <linux/kdebug.h> |
| #include <linux/ptrace.h> |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <asm/processor.h> |
| #include <asm/debug.h> |
| #include <asm/ipl.h> |
| |
| #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) |
| { |
| const unsigned long frame_size = |
| STACK_FRAME_OVERHEAD + sizeof(struct pt_regs); |
| 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 + frame_size - 4096, |
| S390_lowcore.panic_stack + frame_size); |
| #endif |
| sp = __show_trace(sp, |
| S390_lowcore.async_stack + frame_size - ASYNC_SIZE, |
| S390_lowcore.async_stack + frame_size); |
| 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) |
| { |
| show_regs_print_info(KERN_DEFAULT); |
| 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); |
| } |