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8#include <linux/kallsyms.h>
9#include <linux/hardirq.h>
10#include <linux/kprobes.h>
11#include <linux/utsname.h>
12#include <linux/export.h>
13#include <linux/kdebug.h>
14#include <linux/ptrace.h>
15#include <linux/mm.h>
16#include <linux/module.h>
17#include <linux/sched.h>
18#include <linux/sched/debug.h>
19#include <linux/sched/task_stack.h>
20#include <asm/processor.h>
21#include <asm/debug.h>
22#include <asm/dis.h>
23#include <asm/ipl.h>
24
25
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30
31
32
33static unsigned long
34__dump_trace(dump_trace_func_t func, void *data, unsigned long sp,
35 unsigned long low, unsigned long high)
36{
37 struct stack_frame *sf;
38 struct pt_regs *regs;
39
40 while (1) {
41 if (sp < low || sp > high - sizeof(*sf))
42 return sp;
43 sf = (struct stack_frame *) sp;
44 if (func(data, sf->gprs[8], 0))
45 return sp;
46
47 while (1) {
48 low = sp;
49 sp = sf->back_chain;
50 if (!sp)
51 break;
52 if (sp <= low || sp > high - sizeof(*sf))
53 return sp;
54 sf = (struct stack_frame *) sp;
55 if (func(data, sf->gprs[8], 1))
56 return sp;
57 }
58
59 sp = (unsigned long) (sf + 1);
60 if (sp <= low || sp > high - sizeof(*regs))
61 return sp;
62 regs = (struct pt_regs *) sp;
63 if (!user_mode(regs)) {
64 if (func(data, regs->psw.addr, 1))
65 return sp;
66 }
67 low = sp;
68 sp = regs->gprs[15];
69 }
70}
71
72void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
73 unsigned long sp)
74{
75 unsigned long frame_size;
76
77 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
78#ifdef CONFIG_CHECK_STACK
79 sp = __dump_trace(func, data, sp,
80 S390_lowcore.panic_stack + frame_size - PAGE_SIZE,
81 S390_lowcore.panic_stack + frame_size);
82#endif
83 sp = __dump_trace(func, data, sp,
84 S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
85 S390_lowcore.async_stack + frame_size);
86 task = task ?: current;
87 __dump_trace(func, data, sp,
88 (unsigned long)task_stack_page(task),
89 (unsigned long)task_stack_page(task) + THREAD_SIZE);
90}
91EXPORT_SYMBOL_GPL(dump_trace);
92
93static int show_address(void *data, unsigned long address, int reliable)
94{
95 if (reliable)
96 printk(" [<%016lx>] %pSR \n", address, (void *)address);
97 else
98 printk("([<%016lx>] %pSR)\n", address, (void *)address);
99 return 0;
100}
101
102void show_stack(struct task_struct *task, unsigned long *stack)
103{
104 unsigned long sp = (unsigned long) stack;
105
106 if (!sp)
107 sp = task ? task->thread.ksp : current_stack_pointer();
108 printk("Call Trace:\n");
109 dump_trace(show_address, NULL, task, sp);
110 if (!task)
111 task = current;
112 debug_show_held_locks(task);
113}
114
115static void show_last_breaking_event(struct pt_regs *regs)
116{
117 printk("Last Breaking-Event-Address:\n");
118 printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
119}
120
121void show_registers(struct pt_regs *regs)
122{
123 struct psw_bits *psw = &psw_bits(regs->psw);
124 char *mode;
125
126 mode = user_mode(regs) ? "User" : "Krnl";
127 printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
128 if (!user_mode(regs))
129 pr_cont(" (%pSR)", (void *)regs->psw.addr);
130 pr_cont("\n");
131 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
132 "P:%x AS:%x CC:%x PM:%x", psw->per, psw->dat, psw->io, psw->ext,
133 psw->key, psw->mcheck, psw->wait, psw->pstate, psw->as, psw->cc, psw->pm);
134 pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);
135 printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
136 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
137 printk(" %016lx %016lx %016lx %016lx\n",
138 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
139 printk(" %016lx %016lx %016lx %016lx\n",
140 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
141 printk(" %016lx %016lx %016lx %016lx\n",
142 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
143 show_code(regs);
144}
145
146void show_regs(struct pt_regs *regs)
147{
148 show_regs_print_info(KERN_DEFAULT);
149 show_registers(regs);
150
151 if (!user_mode(regs))
152 show_stack(NULL, (unsigned long *) regs->gprs[15]);
153 show_last_breaking_event(regs);
154}
155
156static DEFINE_SPINLOCK(die_lock);
157
158void die(struct pt_regs *regs, const char *str)
159{
160 static int die_counter;
161
162 oops_enter();
163 lgr_info_log();
164 debug_stop_all();
165 console_verbose();
166 spin_lock_irq(&die_lock);
167 bust_spinlocks(1);
168 printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
169 regs->int_code >> 17, ++die_counter);
170#ifdef CONFIG_PREEMPT
171 pr_cont("PREEMPT ");
172#endif
173#ifdef CONFIG_SMP
174 pr_cont("SMP ");
175#endif
176 if (debug_pagealloc_enabled())
177 pr_cont("DEBUG_PAGEALLOC");
178 pr_cont("\n");
179 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
180 print_modules();
181 show_regs(regs);
182 bust_spinlocks(0);
183 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
184 spin_unlock_irq(&die_lock);
185 if (in_interrupt())
186 panic("Fatal exception in interrupt");
187 if (panic_on_oops)
188 panic("Fatal exception: panic_on_oops");
189 oops_exit();
190 do_exit(SIGSEGV);
191}
192
