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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
25#define LONG "%016lx "
26#define FOURLONG "%016lx %016lx %016lx %016lx\n"
27static int kstack_depth_to_print = 20;
28#endif
29
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36
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
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
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 const unsigned long frame_size =
78 STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
79 register unsigned long __r15 asm ("15");
80 unsigned long sp;
81
82 sp = (unsigned long) stack;
83 if (!sp)
84 sp = task ? task->thread.ksp : __r15;
85 printk("Call Trace:\n");
86#ifdef CONFIG_CHECK_STACK
87 sp = __show_trace(sp,
88 S390_lowcore.panic_stack + frame_size - 4096,
89 S390_lowcore.panic_stack + frame_size);
90#endif
91 sp = __show_trace(sp,
92 S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
93 S390_lowcore.async_stack + frame_size);
94 if (task)
95 __show_trace(sp, (unsigned long) task_stack_page(task),
96 (unsigned long) task_stack_page(task) + THREAD_SIZE);
97 else
98 __show_trace(sp, S390_lowcore.thread_info,
99 S390_lowcore.thread_info + THREAD_SIZE);
100 if (!task)
101 task = current;
102 debug_show_held_locks(task);
103}
104
105void show_stack(struct task_struct *task, unsigned long *sp)
106{
107 register unsigned long *__r15 asm ("15");
108 unsigned long *stack;
109 int i;
110
111 if (!sp)
112 stack = task ? (unsigned long *) task->thread.ksp : __r15;
113 else
114 stack = sp;
115
116 for (i = 0; i < kstack_depth_to_print; i++) {
117 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
118 break;
119 if ((i * sizeof(long) % 32) == 0)
120 printk("%s ", i == 0 ? "" : "\n");
121 printk(LONG, *stack++);
122 }
123 printk("\n");
124 show_trace(task, sp);
125}
126
127static void show_last_breaking_event(struct pt_regs *regs)
128{
129#ifdef CONFIG_64BIT
130 printk("Last Breaking-Event-Address:\n");
131 printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN);
132 print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN);
133#endif
134}
135
136static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
137{
138 return (regs->psw.mask & bits) / ((~bits + 1) & bits);
139}
140
141void show_registers(struct pt_regs *regs)
142{
143 char *mode;
144
145 mode = user_mode(regs) ? "User" : "Krnl";
146 printk("%s PSW : %p %p",
147 mode, (void *) regs->psw.mask,
148 (void *) regs->psw.addr);
149 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
150 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
151 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
152 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
153 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
154 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
155 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
156 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
157#ifdef CONFIG_64BIT
158 printk(" EA:%x", mask_bits(regs, PSW_MASK_EA | PSW_MASK_BA));
159#endif
160 printk("\n%s GPRS: " FOURLONG, mode,
161 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
162 printk(" " FOURLONG,
163 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
164 printk(" " FOURLONG,
165 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
166 printk(" " FOURLONG,
167 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
168 show_code(regs);
169}
170
171void show_regs(struct pt_regs *regs)
172{
173 show_regs_print_info(KERN_DEFAULT);
174 show_registers(regs);
175
176 if (!user_mode(regs))
177 show_trace(NULL, (unsigned long *) regs->gprs[15]);
178 show_last_breaking_event(regs);
179}
180
181static DEFINE_SPINLOCK(die_lock);
182
183void die(struct pt_regs *regs, const char *str)
184{
185 static int die_counter;
186
187 oops_enter();
188 lgr_info_log();
189 debug_stop_all();
190 console_verbose();
191 spin_lock_irq(&die_lock);
192 bust_spinlocks(1);
193 printk("%s: %04x [#%d] ", str, regs->int_code & 0xffff, ++die_counter);
194#ifdef CONFIG_PREEMPT
195 printk("PREEMPT ");
196#endif
197#ifdef CONFIG_SMP
198 printk("SMP ");
199#endif
200#ifdef CONFIG_DEBUG_PAGEALLOC
201 printk("DEBUG_PAGEALLOC");
202#endif
203 printk("\n");
204 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
205 print_modules();
206 show_regs(regs);
207 bust_spinlocks(0);
208 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
209 spin_unlock_irq(&die_lock);
210 if (in_interrupt())
211 panic("Fatal exception in interrupt");
212 if (panic_on_oops)
213 panic("Fatal exception: panic_on_oops");
214 oops_exit();
215 do_exit(SIGSEGV);
216}
217
