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[mirror_ubuntu-bionic-kernel.git] / arch / s390 / kernel / dumpstack.c
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a17ae4c3 1// SPDX-License-Identifier: GPL-2.0
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2/*
3 * Stack dumping functions
4 *
5 * Copyright IBM Corp. 1999, 2013
6 */
7
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>
10917b83 15#include <linux/mm.h>
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16#include <linux/module.h>
17#include <linux/sched.h>
b17b0153 18#include <linux/sched/debug.h>
68db0cf1 19#include <linux/sched/task_stack.h>
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20#include <asm/processor.h>
21#include <asm/debug.h>
0f20822a 22#include <asm/dis.h>
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23#include <asm/ipl.h>
24
1bca09f7 25/*
758d39eb 26 * For dump_trace we have tree different stack to consider:
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27 * - the panic stack which is used if the kernel stack has overflown
28 * - the asynchronous interrupt stack (cpu related)
29 * - the synchronous kernel stack (process related)
758d39eb 30 * The stack trace can start at any of the three stacks and can potentially
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31 * touch all of them. The order is: panic stack, async stack, sync stack.
32 */
33static unsigned long
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34__dump_trace(dump_trace_func_t func, void *data, unsigned long sp,
35 unsigned long low, unsigned long high)
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36{
37 struct stack_frame *sf;
38 struct pt_regs *regs;
39
40 while (1) {
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41 if (sp < low || sp > high - sizeof(*sf))
42 return sp;
43 sf = (struct stack_frame *) sp;
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44 if (func(data, sf->gprs[8], 0))
45 return sp;
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46 /* Follow the backchain. */
47 while (1) {
48 low = sp;
9cb1ccec 49 sp = sf->back_chain;
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50 if (!sp)
51 break;
52 if (sp <= low || sp > high - sizeof(*sf))
53 return sp;
54 sf = (struct stack_frame *) sp;
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55 if (func(data, sf->gprs[8], 1))
56 return sp;
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57 }
58 /* Zero backchain detected, check for interrupt frame. */
59 sp = (unsigned long) (sf + 1);
60 if (sp <= low || sp > high - sizeof(*regs))
61 return sp;
62 regs = (struct pt_regs *) sp;
758d39eb 63 if (!user_mode(regs)) {
d0208639 64 if (func(data, regs->psw.addr, 1))
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65 return sp;
66 }
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67 low = sp;
68 sp = regs->gprs[15];
69 }
70}
71
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72void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
73 unsigned long sp)
1bca09f7 74{
758d39eb 75 unsigned long frame_size;
1bca09f7 76
758d39eb 77 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
1bca09f7 78#ifdef CONFIG_CHECK_STACK
758d39eb 79 sp = __dump_trace(func, data, sp,
f1c1174f 80 S390_lowcore.panic_stack + frame_size - PAGE_SIZE,
9cc5c206 81 S390_lowcore.panic_stack + frame_size);
1bca09f7 82#endif
758d39eb 83 sp = __dump_trace(func, data, sp,
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84 S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
85 S390_lowcore.async_stack + frame_size);
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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);
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90}
91EXPORT_SYMBOL_GPL(dump_trace);
92
d0208639 93static int show_address(void *data, unsigned long address, int reliable)
758d39eb 94{
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95 if (reliable)
96 printk(" [<%016lx>] %pSR \n", address, (void *)address);
97 else
98 printk("([<%016lx>] %pSR)\n", address, (void *)address);
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99 return 0;
100}
101
2b7b9817 102void show_stack(struct task_struct *task, unsigned long *stack)
758d39eb 103{
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104 unsigned long sp = (unsigned long) stack;
105
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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);
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110 if (!task)
111 task = current;
112 debug_show_held_locks(task);
113}
114
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115static void show_last_breaking_event(struct pt_regs *regs)
116{
1bca09f7 117 printk("Last Breaking-Event-Address:\n");
8237ac3c 118 printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
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119}
120
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121void show_registers(struct pt_regs *regs)
122{
1f021ea0 123 struct psw_bits *psw = &psw_bits(regs->psw);
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124 char *mode;
125
126 mode = user_mode(regs) ? "User" : "Krnl";
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127 printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
128 if (!user_mode(regs))
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129 pr_cont(" (%pSR)", (void *)regs->psw.addr);
130 pr_cont("\n");
1bca09f7 131 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
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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);
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134 pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);
135 printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
1bca09f7 136 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
5a79859a 137 printk(" %016lx %016lx %016lx %016lx\n",
1bca09f7 138 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
5a79859a 139 printk(" %016lx %016lx %016lx %016lx\n",
1bca09f7 140 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
5a79859a 141 printk(" %016lx %016lx %016lx %016lx\n",
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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{
a43cb95d 148 show_regs_print_info(KERN_DEFAULT);
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149 show_registers(regs);
150 /* Show stack backtrace if pt_regs is from kernel mode */
151 if (!user_mode(regs))
2b7b9817 152 show_stack(NULL, (unsigned long *) regs->gprs[15]);
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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);
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168 printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
169 regs->int_code >> 17, ++die_counter);
1bca09f7 170#ifdef CONFIG_PREEMPT
47ece7fe 171 pr_cont("PREEMPT ");
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172#endif
173#ifdef CONFIG_SMP
47ece7fe 174 pr_cont("SMP ");
1bca09f7 175#endif
10917b83 176 if (debug_pagealloc_enabled())
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177 pr_cont("DEBUG_PAGEALLOC");
178 pr_cont("\n");
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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}