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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/mm.h>
15#include <linux/module.h>
16#include <linux/sched.h>
17#include <asm/processor.h>
18#include <asm/debug.h>
19#include <asm/dis.h>
20#include <asm/ipl.h>
21
22
23
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27
28
29
30static unsigned long
31__dump_trace(dump_trace_func_t func, void *data, unsigned long sp,
32 unsigned long low, unsigned long high)
33{
34 struct stack_frame *sf;
35 struct pt_regs *regs;
36
37 while (1) {
38 if (sp < low || sp > high - sizeof(*sf))
39 return sp;
40 sf = (struct stack_frame *) sp;
41 if (func(data, sf->gprs[8], 0))
42 return sp;
43
44 while (1) {
45 low = sp;
46 sp = sf->back_chain;
47 if (!sp)
48 break;
49 if (sp <= low || sp > high - sizeof(*sf))
50 return sp;
51 sf = (struct stack_frame *) sp;
52 if (func(data, sf->gprs[8], 1))
53 return sp;
54 }
55
56 sp = (unsigned long) (sf + 1);
57 if (sp <= low || sp > high - sizeof(*regs))
58 return sp;
59 regs = (struct pt_regs *) sp;
60 if (!user_mode(regs)) {
61 if (func(data, regs->psw.addr, 1))
62 return sp;
63 }
64 low = sp;
65 sp = regs->gprs[15];
66 }
67}
68
69void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
70 unsigned long sp)
71{
72 unsigned long frame_size;
73
74 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
75#ifdef CONFIG_CHECK_STACK
76 sp = __dump_trace(func, data, sp,
77 S390_lowcore.panic_stack + frame_size - 4096,
78 S390_lowcore.panic_stack + frame_size);
79#endif
80 sp = __dump_trace(func, data, sp,
81 S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
82 S390_lowcore.async_stack + frame_size);
83 task = task ?: current;
84 __dump_trace(func, data, sp,
85 (unsigned long)task_stack_page(task),
86 (unsigned long)task_stack_page(task) + THREAD_SIZE);
87}
88EXPORT_SYMBOL_GPL(dump_trace);
89
90static int show_address(void *data, unsigned long address, int reliable)
91{
92 if (reliable)
93 printk(" [<%016lx>] %pSR \n", address, (void *)address);
94 else
95 printk("([<%016lx>] %pSR)\n", address, (void *)address);
96 return 0;
97}
98
99static void show_trace(struct task_struct *task, unsigned long sp)
100{
101 if (!sp)
102 sp = task ? task->thread.ksp : current_stack_pointer();
103 printk("Call Trace:\n");
104 dump_trace(show_address, NULL, task, sp);
105 if (!task)
106 task = current;
107 debug_show_held_locks(task);
108}
109
110void show_stack(struct task_struct *task, unsigned long *sp)
111{
112 unsigned long *stack;
113 int i;
114
115 stack = sp;
116 if (!stack) {
117 if (!task)
118 stack = (unsigned long *)current_stack_pointer();
119 else
120 stack = (unsigned long *)task->thread.ksp;
121 }
122 printk(KERN_DEFAULT "Stack:\n");
123 for (i = 0; i < 20; i++) {
124 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
125 break;
126 if (i % 4 == 0)
127 printk(KERN_DEFAULT " ");
128 pr_cont("%016lx%c", *stack++, i % 4 == 3 ? '\n' : ' ');
129 }
130 show_trace(task, (unsigned long)sp);
131}
132
133static void show_last_breaking_event(struct pt_regs *regs)
134{
135 printk("Last Breaking-Event-Address:\n");
136 printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
137}
138
139void show_registers(struct pt_regs *regs)
140{
141 struct psw_bits *psw = &psw_bits(regs->psw);
142 char *mode;
143
144 mode = user_mode(regs) ? "User" : "Krnl";
145 printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
146 if (!user_mode(regs))
147 pr_cont(" (%pSR)", (void *)regs->psw.addr);
148 pr_cont("\n");
149 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
150 "P:%x AS:%x CC:%x PM:%x", psw->r, psw->t, psw->i, psw->e,
151 psw->key, psw->m, psw->w, psw->p, psw->as, psw->cc, psw->pm);
152 pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);
153 printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
154 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
155 printk(" %016lx %016lx %016lx %016lx\n",
156 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
157 printk(" %016lx %016lx %016lx %016lx\n",
158 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
159 printk(" %016lx %016lx %016lx %016lx\n",
160 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
161 show_code(regs);
162}
163
164void show_regs(struct pt_regs *regs)
165{
166 show_regs_print_info(KERN_DEFAULT);
167 show_registers(regs);
168
169 if (!user_mode(regs))
170 show_trace(NULL, regs->gprs[15]);
171 show_last_breaking_event(regs);
172}
173
174static DEFINE_SPINLOCK(die_lock);
175
176void die(struct pt_regs *regs, const char *str)
177{
178 static int die_counter;
179
180 oops_enter();
181 lgr_info_log();
182 debug_stop_all();
183 console_verbose();
184 spin_lock_irq(&die_lock);
185 bust_spinlocks(1);
186 printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
187 regs->int_code >> 17, ++die_counter);
188#ifdef CONFIG_PREEMPT
189 pr_cont("PREEMPT ");
190#endif
191#ifdef CONFIG_SMP
192 pr_cont("SMP ");
193#endif
194 if (debug_pagealloc_enabled())
195 pr_cont("DEBUG_PAGEALLOC");
196 pr_cont("\n");
197 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
198 print_modules();
199 show_regs(regs);
200 bust_spinlocks(0);
201 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
202 spin_unlock_irq(&die_lock);
203 if (in_interrupt())
204 panic("Fatal exception in interrupt");
205 if (panic_on_oops)
206 panic("Fatal exception: panic_on_oops");
207 oops_exit();
208 do_exit(SIGSEGV);
209}
210
