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-rw-r--r--arch/s390/kernel/dumpstack.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
new file mode 100644
index 000000000000..298297477257
--- /dev/null
+++ b/arch/s390/kernel/dumpstack.c
@@ -0,0 +1,212 @@
1/*
2 * Stack dumping functions
3 *
4 * Copyright IBM Corp. 1999, 2013
5 */
6
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>
18#include <asm/ipl.h>
19
20#ifndef CONFIG_64BIT
21#define LONG "%08lx "
22#define FOURLONG "%08lx %08lx %08lx %08lx\n"
23static int kstack_depth_to_print = 12;
24#else /* CONFIG_64BIT */
25#define LONG "%016lx "
26#define FOURLONG "%016lx %016lx %016lx %016lx\n"
27static int kstack_depth_to_print = 20;
28#endif /* CONFIG_64BIT */
29
30/*
31 * For show_trace we have tree different stack to consider:
32 * - the panic stack which is used if the kernel stack has overflown
33 * - the asynchronous interrupt stack (cpu related)
34 * - the synchronous kernel stack (process related)
35 * The stack trace can start at any of the three stack and can potentially
36 * touch all of them. The order is: panic stack, async stack, sync stack.
37 */
38static unsigned long
39__show_trace(unsigned long sp, unsigned long low, unsigned long high)
40{
41 struct stack_frame *sf;
42 struct pt_regs *regs;
43
44 while (1) {
45 sp = sp & PSW_ADDR_INSN;
46 if (sp < low || sp > high - sizeof(*sf))
47 return sp;
48 sf = (struct stack_frame *) sp;
49 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
50 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
51 /* Follow the backchain. */
52 while (1) {
53 low = sp;
54 sp = sf->back_chain & PSW_ADDR_INSN;
55 if (!sp)
56 break;
57 if (sp <= low || sp > high - sizeof(*sf))
58 return sp;
59 sf = (struct stack_frame *) sp;
60 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
61 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
62 }
63 /* Zero backchain detected, check for interrupt frame. */
64 sp = (unsigned long) (sf + 1);
65 if (sp <= low || sp > high - sizeof(*regs))
66 return sp;
67 regs = (struct pt_regs *) sp;
68 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
69 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
70 low = sp;
71 sp = regs->gprs[15];
72 }
73}
74
75static void show_trace(struct task_struct *task, unsigned long *stack)
76{
77 register unsigned long __r15 asm ("15");
78 unsigned long sp;
79
80 sp = (unsigned long) stack;
81 if (!sp)
82 sp = task ? task->thread.ksp : __r15;
83 printk("Call Trace:\n");
84#ifdef CONFIG_CHECK_STACK
85 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
86 S390_lowcore.panic_stack);
87#endif
88 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
89 S390_lowcore.async_stack);
90 if (task)
91 __show_trace(sp, (unsigned long) task_stack_page(task),
92 (unsigned long) task_stack_page(task) + THREAD_SIZE);
93 else
94 __show_trace(sp, S390_lowcore.thread_info,
95 S390_lowcore.thread_info + THREAD_SIZE);
96 if (!task)
97 task = current;
98 debug_show_held_locks(task);
99}
100
101void show_stack(struct task_struct *task, unsigned long *sp)
102{
103 register unsigned long *__r15 asm ("15");
104 unsigned long *stack;
105 int i;
106
107 if (!sp)
108 stack = task ? (unsigned long *) task->thread.ksp : __r15;
109 else
110 stack = sp;
111
112 for (i = 0; i < kstack_depth_to_print; i++) {
113 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
114 break;
115 if ((i * sizeof(long) % 32) == 0)
116 printk("%s ", i == 0 ? "" : "\n");
117 printk(LONG, *stack++);
118 }
119 printk("\n");
120 show_trace(task, sp);
121}
122
123static void show_last_breaking_event(struct pt_regs *regs)
124{
125#ifdef CONFIG_64BIT
126 printk("Last Breaking-Event-Address:\n");
127 printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN);
128 print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN);
129#endif
130}
131
132static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
133{
134 return (regs->psw.mask & bits) / ((~bits + 1) & bits);
135}
136
137void show_registers(struct pt_regs *regs)
138{
139 char *mode;
140
141 mode = user_mode(regs) ? "User" : "Krnl";
142 printk("%s PSW : %p %p",
143 mode, (void *) regs->psw.mask,
144 (void *) regs->psw.addr);
145 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
146 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
147 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
148 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
149 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
150 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
151 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
152 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
153#ifdef CONFIG_64BIT
154 printk(" EA:%x", mask_bits(regs, PSW_MASK_EA | PSW_MASK_BA));
155#endif
156 printk("\n%s GPRS: " FOURLONG, mode,
157 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
158 printk(" " FOURLONG,
159 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
160 printk(" " FOURLONG,
161 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
162 printk(" " FOURLONG,
163 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
164 show_code(regs);
165}
166
167void show_regs(struct pt_regs *regs)
168{
169 show_regs_print_info(KERN_DEFAULT);
170 show_registers(regs);
171 /* Show stack backtrace if pt_regs is from kernel mode */
172 if (!user_mode(regs))
173 show_trace(NULL, (unsigned long *) regs->gprs[15]);
174 show_last_breaking_event(regs);
175}
176
177static DEFINE_SPINLOCK(die_lock);
178
179void die(struct pt_regs *regs, const char *str)
180{
181 static int die_counter;
182
183 oops_enter();
184 lgr_info_log();
185 debug_stop_all();
186 console_verbose();
187 spin_lock_irq(&die_lock);
188 bust_spinlocks(1);
189 printk("%s: %04x [#%d] ", str, regs->int_code & 0xffff, ++die_counter);
190#ifdef CONFIG_PREEMPT
191 printk("PREEMPT ");
192#endif
193#ifdef CONFIG_SMP
194 printk("SMP ");
195#endif
196#ifdef CONFIG_DEBUG_PAGEALLOC
197 printk("DEBUG_PAGEALLOC");
198#endif
199 printk("\n");
200 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
201 print_modules();
202 show_regs(regs);
203 bust_spinlocks(0);
204 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
205 spin_unlock_irq(&die_lock);
206 if (in_interrupt())
207 panic("Fatal exception in interrupt");
208 if (panic_on_oops)
209 panic("Fatal exception: panic_on_oops");
210 oops_exit();
211 do_exit(SIGSEGV);
212}
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