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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
42 while (1) {
43 if (func(data, sf->gprs[8]))
44 return sp;
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 }
53
54 sp = (unsigned long) (sf + 1);
55 if (sp <= low || sp > high - sizeof(*regs))
56 return sp;
57 regs = (struct pt_regs *) sp;
58 if (!user_mode(regs)) {
59 if (func(data, regs->psw.addr))
60 return sp;
61 }
62 low = sp;
63 sp = regs->gprs[15];
64 }
65}
66
67void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
68 unsigned long sp)
69{
70 unsigned long frame_size;
71
72 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
73#ifdef CONFIG_CHECK_STACK
74 sp = __dump_trace(func, data, sp,
75 S390_lowcore.panic_stack + frame_size - 4096,
76 S390_lowcore.panic_stack + frame_size);
77#endif
78 sp = __dump_trace(func, data, sp,
79 S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
80 S390_lowcore.async_stack + frame_size);
81 if (task)
82 __dump_trace(func, data, sp,
83 (unsigned long)task_stack_page(task),
84 (unsigned long)task_stack_page(task) + THREAD_SIZE);
85 else
86 __dump_trace(func, data, sp,
87 S390_lowcore.thread_info,
88 S390_lowcore.thread_info + THREAD_SIZE);
89}
90EXPORT_SYMBOL_GPL(dump_trace);
91
92struct return_address_data {
93 unsigned long address;
94 int depth;
95};
96
97static int __return_address(void *data, unsigned long address)
98{
99 struct return_address_data *rd = data;
100
101 if (rd->depth--)
102 return 0;
103 rd->address = address;
104 return 1;
105}
106
107unsigned long return_address(int depth)
108{
109 struct return_address_data rd = { .depth = depth + 2 };
110
111 dump_trace(__return_address, &rd, NULL, current_stack_pointer());
112 return rd.address;
113}
114EXPORT_SYMBOL_GPL(return_address);
115
116static int show_address(void *data, unsigned long address)
117{
118 printk("([<%016lx>] %pSR)\n", address, (void *)address);
119 return 0;
120}
121
122static void show_trace(struct task_struct *task, unsigned long sp)
123{
124 if (!sp)
125 sp = task ? task->thread.ksp : current_stack_pointer();
126 printk("Call Trace:\n");
127 dump_trace(show_address, NULL, task, sp);
128 if (!task)
129 task = current;
130 debug_show_held_locks(task);
131}
132
133void show_stack(struct task_struct *task, unsigned long *sp)
134{
135 unsigned long *stack;
136 int i;
137
138 stack = sp;
139 if (!stack) {
140 if (!task)
141 stack = (unsigned long *)current_stack_pointer();
142 else
143 stack = (unsigned long *)task->thread.ksp;
144 }
145 for (i = 0; i < 20; i++) {
146 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
147 break;
148 if ((i * sizeof(long) % 32) == 0)
149 printk("%s ", i == 0 ? "" : "\n");
150 printk("%016lx ", *stack++);
151 }
152 printk("\n");
153 show_trace(task, (unsigned long)sp);
154}
155
156static void show_last_breaking_event(struct pt_regs *regs)
157{
158 printk("Last Breaking-Event-Address:\n");
159 printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
160}
161
162void show_registers(struct pt_regs *regs)
163{
164 struct psw_bits *psw = &psw_bits(regs->psw);
165 char *mode;
166
167 mode = user_mode(regs) ? "User" : "Krnl";
168 printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
169 if (!user_mode(regs))
170 printk(" (%pSR)", (void *)regs->psw.addr);
171 printk("\n");
172 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
173 "P:%x AS:%x CC:%x PM:%x", psw->r, psw->t, psw->i, psw->e,
174 psw->key, psw->m, psw->w, psw->p, psw->as, psw->cc, psw->pm);
175 printk(" RI:%x EA:%x", psw->ri, psw->eaba);
176 printk("\n%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
177 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
178 printk(" %016lx %016lx %016lx %016lx\n",
179 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
180 printk(" %016lx %016lx %016lx %016lx\n",
181 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
182 printk(" %016lx %016lx %016lx %016lx\n",
183 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
184 show_code(regs);
185}
186
187void show_regs(struct pt_regs *regs)
188{
189 show_regs_print_info(KERN_DEFAULT);
190 show_registers(regs);
191
192 if (!user_mode(regs))
193 show_trace(NULL, regs->gprs[15]);
194 show_last_breaking_event(regs);
195}
196
197static DEFINE_SPINLOCK(die_lock);
198
199void die(struct pt_regs *regs, const char *str)
200{
201 static int die_counter;
202
203 oops_enter();
204 lgr_info_log();
205 debug_stop_all();
206 console_verbose();
207 spin_lock_irq(&die_lock);
208 bust_spinlocks(1);
209 printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
210 regs->int_code >> 17, ++die_counter);
211#ifdef CONFIG_PREEMPT
212 printk("PREEMPT ");
213#endif
214#ifdef CONFIG_SMP
215 printk("SMP ");
216#endif
217 if (debug_pagealloc_enabled())
218 printk("DEBUG_PAGEALLOC");
219 printk("\n");
220 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
221 print_modules();
222 show_regs(regs);
223 bust_spinlocks(0);
224 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
225 spin_unlock_irq(&die_lock);
226 if (in_interrupt())
227 panic("Fatal exception in interrupt");
228 if (panic_on_oops)
229 panic("Fatal exception: panic_on_oops");
230 oops_exit();
231 do_exit(SIGSEGV);
232}
233
