2 * Stack dumping functions
4 * Copyright IBM Corp. 1999, 2013
7 #include <linux/kallsyms.h>
8 #include <linux/hardirq.h>
9 #include <linux/kprobes.h>
10 #include <linux/utsname.h>
11 #include <linux/export.h>
12 #include <linux/kdebug.h>
13 #include <linux/ptrace.h>
14 #include <linux/module.h>
15 #include <linux/sched.h>
16 #include <asm/processor.h>
17 #include <asm/debug.h>
22 * For show_trace we have tree different stack to consider:
23 * - the panic stack which is used if the kernel stack has overflown
24 * - the asynchronous interrupt stack (cpu related)
25 * - the synchronous kernel stack (process related)
26 * The stack trace can start at any of the three stack and can potentially
27 * touch all of them. The order is: panic stack, async stack, sync stack.
30 __show_trace(unsigned long sp, unsigned long low, unsigned long high)
32 struct stack_frame *sf;
37 if (sp < low || sp > high - sizeof(*sf))
39 sf = (struct stack_frame *) sp;
41 printk("([<%016lx>] %pSR)\n", addr, (void *)addr);
42 /* Follow the backchain. */
48 if (sp <= low || sp > high - sizeof(*sf))
50 sf = (struct stack_frame *) sp;
52 printk(" [<%016lx>] %pSR\n", addr, (void *)addr);
54 /* Zero backchain detected, check for interrupt frame. */
55 sp = (unsigned long) (sf + 1);
56 if (sp <= low || sp > high - sizeof(*regs))
58 regs = (struct pt_regs *) sp;
59 addr = regs->psw.addr;
60 printk(" [<%016lx>] %pSR\n", addr, (void *)addr);
66 static void show_trace(struct task_struct *task, unsigned long *stack)
68 const unsigned long frame_size =
69 STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
70 register unsigned long __r15 asm ("15");
73 sp = (unsigned long) stack;
75 sp = task ? task->thread.ksp : __r15;
76 printk("Call Trace:\n");
77 #ifdef CONFIG_CHECK_STACK
79 S390_lowcore.panic_stack + frame_size - 4096,
80 S390_lowcore.panic_stack + frame_size);
83 S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
84 S390_lowcore.async_stack + frame_size);
86 __show_trace(sp, (unsigned long) task_stack_page(task),
87 (unsigned long) task_stack_page(task) + THREAD_SIZE);
89 __show_trace(sp, S390_lowcore.thread_info,
90 S390_lowcore.thread_info + THREAD_SIZE);
93 debug_show_held_locks(task);
96 void show_stack(struct task_struct *task, unsigned long *sp)
98 register unsigned long *__r15 asm ("15");
103 stack = task ? (unsigned long *) task->thread.ksp : __r15;
107 for (i = 0; i < 20; i++) {
108 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
110 if ((i * sizeof(long) % 32) == 0)
111 printk("%s ", i == 0 ? "" : "\n");
112 printk("%016lx ", *stack++);
115 show_trace(task, sp);
118 static void show_last_breaking_event(struct pt_regs *regs)
120 printk("Last Breaking-Event-Address:\n");
121 printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
124 static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
126 return (regs->psw.mask & bits) / ((~bits + 1) & bits);
129 void show_registers(struct pt_regs *regs)
133 mode = user_mode(regs) ? "User" : "Krnl";
134 printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
135 if (!user_mode(regs))
136 printk(" (%pSR)", (void *)regs->psw.addr);
138 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
139 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
140 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
141 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
142 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
143 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
144 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
145 printk(" EA:%x", mask_bits(regs, PSW_MASK_EA | PSW_MASK_BA));
146 printk("\n%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
147 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
148 printk(" %016lx %016lx %016lx %016lx\n",
149 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
150 printk(" %016lx %016lx %016lx %016lx\n",
151 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
152 printk(" %016lx %016lx %016lx %016lx\n",
153 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
157 void show_regs(struct pt_regs *regs)
159 show_regs_print_info(KERN_DEFAULT);
160 show_registers(regs);
161 /* Show stack backtrace if pt_regs is from kernel mode */
162 if (!user_mode(regs))
163 show_trace(NULL, (unsigned long *) regs->gprs[15]);
164 show_last_breaking_event(regs);
167 static DEFINE_SPINLOCK(die_lock);
169 void die(struct pt_regs *regs, const char *str)
171 static int die_counter;
177 spin_lock_irq(&die_lock);
179 printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
180 regs->int_code >> 17, ++die_counter);
181 #ifdef CONFIG_PREEMPT
187 #ifdef CONFIG_DEBUG_PAGEALLOC
188 printk("DEBUG_PAGEALLOC");
191 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
195 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
196 spin_unlock_irq(&die_lock);
198 panic("Fatal exception in interrupt");
200 panic("Fatal exception: panic_on_oops");