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1bca09f7 HC |
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" | |
23 | static int kstack_depth_to_print = 12; | |
24 | #else /* CONFIG_64BIT */ | |
25 | #define LONG "%016lx " | |
26 | #define FOURLONG "%016lx %016lx %016lx %016lx\n" | |
27 | static 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 | */ | |
38 | static 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 | ||
75 | static 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 | ||
101 | void 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 | ||
123 | static 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 | ||
1bca09f7 HC |
132 | static inline int mask_bits(struct pt_regs *regs, unsigned long bits) |
133 | { | |
134 | return (regs->psw.mask & bits) / ((~bits + 1) & bits); | |
135 | } | |
136 | ||
137 | void 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 | ||
167 | void show_regs(struct pt_regs *regs) | |
168 | { | |
a43cb95d | 169 | show_regs_print_info(KERN_DEFAULT); |
1bca09f7 HC |
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 | ||
177 | static DEFINE_SPINLOCK(die_lock); | |
178 | ||
179 | void 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 | } |