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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/dis.h>
19#include <asm/ipl.h>
20
21#ifndef CONFIG_64BIT
22#define LONG "%08lx "
23#define FOURLONG "%08lx %08lx %08lx %08lx\n"
24static int kstack_depth_to_print = 12;
25#else /* CONFIG_64BIT */
26#define LONG "%016lx "
27#define FOURLONG "%016lx %016lx %016lx %016lx\n"
28static int kstack_depth_to_print = 20;
29#endif /* CONFIG_64BIT */
30
31/*
32 * For show_trace we have tree different stack to consider:
33 * - the panic stack which is used if the kernel stack has overflown
34 * - the asynchronous interrupt stack (cpu related)
35 * - the synchronous kernel stack (process related)
36 * The stack trace can start at any of the three stack and can potentially
37 * touch all of them. The order is: panic stack, async stack, sync stack.
38 */
39static unsigned long
40__show_trace(unsigned long sp, unsigned long low, unsigned long high)
41{
42 struct stack_frame *sf;
43 struct pt_regs *regs;
44 unsigned long addr;
45
46 while (1) {
47 sp = sp & PSW_ADDR_INSN;
48 if (sp < low || sp > high - sizeof(*sf))
49 return sp;
50 sf = (struct stack_frame *) sp;
51 addr = sf->gprs[8] & PSW_ADDR_INSN;
52 printk("([<%016lx>] %pSR)\n", addr, (void *)addr);
53 /* Follow the backchain. */
54 while (1) {
55 low = sp;
56 sp = sf->back_chain & PSW_ADDR_INSN;
57 if (!sp)
58 break;
59 if (sp <= low || sp > high - sizeof(*sf))
60 return sp;
61 sf = (struct stack_frame *) sp;
62 addr = sf->gprs[8] & PSW_ADDR_INSN;
63 printk(" [<%016lx>] %pSR\n", addr, (void *)addr);
64 }
65 /* Zero backchain detected, check for interrupt frame. */
66 sp = (unsigned long) (sf + 1);
67 if (sp <= low || sp > high - sizeof(*regs))
68 return sp;
69 regs = (struct pt_regs *) sp;
70 addr = regs->psw.addr & PSW_ADDR_INSN;
71 printk(" [<%016lx>] %pSR\n", addr, (void *)addr);
72 low = sp;
73 sp = regs->gprs[15];
74 }
75}
76
77static void show_trace(struct task_struct *task, unsigned long *stack)
78{
79 const unsigned long frame_size =
80 STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
81 register unsigned long __r15 asm ("15");
82 unsigned long sp;
83
84 sp = (unsigned long) stack;
85 if (!sp)
86 sp = task ? task->thread.ksp : __r15;
87 printk("Call Trace:\n");
88#ifdef CONFIG_CHECK_STACK
89 sp = __show_trace(sp,
90 S390_lowcore.panic_stack + frame_size - 4096,
91 S390_lowcore.panic_stack + frame_size);
92#endif
93 sp = __show_trace(sp,
94 S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
95 S390_lowcore.async_stack + frame_size);
96 if (task)
97 __show_trace(sp, (unsigned long) task_stack_page(task),
98 (unsigned long) task_stack_page(task) + THREAD_SIZE);
99 else
100 __show_trace(sp, S390_lowcore.thread_info,
101 S390_lowcore.thread_info + THREAD_SIZE);
102 if (!task)
103 task = current;
104 debug_show_held_locks(task);
105}
106
107void show_stack(struct task_struct *task, unsigned long *sp)
108{
109 register unsigned long *__r15 asm ("15");
110 unsigned long *stack;
111 int i;
112
113 if (!sp)
114 stack = task ? (unsigned long *) task->thread.ksp : __r15;
115 else
116 stack = sp;
117
118 for (i = 0; i < kstack_depth_to_print; i++) {
119 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
120 break;
121 if ((i * sizeof(long) % 32) == 0)
122 printk("%s ", i == 0 ? "" : "\n");
123 printk(LONG, *stack++);
124 }
125 printk("\n");
126 show_trace(task, sp);
127}
128
129static void show_last_breaking_event(struct pt_regs *regs)
130{
131#ifdef CONFIG_64BIT
132 printk("Last Breaking-Event-Address:\n");
133 printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
134#endif
135}
136
137static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
138{
139 return (regs->psw.mask & bits) / ((~bits + 1) & bits);
140}
141
142void show_registers(struct pt_regs *regs)
143{
144 char *mode;
145
146 mode = user_mode(regs) ? "User" : "Krnl";
147 printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
148 if (!user_mode(regs))
149 printk(" (%pSR)", (void *)regs->psw.addr);
150 printk("\n");
151 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
152 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
153 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
154 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
155 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
156 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
157 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
158#ifdef CONFIG_64BIT
159 printk(" EA:%x", mask_bits(regs, PSW_MASK_EA | PSW_MASK_BA));
160#endif
161 printk("\n%s GPRS: " FOURLONG, mode,
162 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
163 printk(" " FOURLONG,
164 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
165 printk(" " FOURLONG,
166 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
167 printk(" " FOURLONG,
168 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
169 show_code(regs);
170}
171
172void show_regs(struct pt_regs *regs)
173{
174 show_regs_print_info(KERN_DEFAULT);
175 show_registers(regs);
176 /* Show stack backtrace if pt_regs is from kernel mode */
177 if (!user_mode(regs))
178 show_trace(NULL, (unsigned long *) regs->gprs[15]);
179 show_last_breaking_event(regs);
180}
181
182static DEFINE_SPINLOCK(die_lock);
183
184void die(struct pt_regs *regs, const char *str)
185{
186 static int die_counter;
187
188 oops_enter();
189 lgr_info_log();
190 debug_stop_all();
191 console_verbose();
192 spin_lock_irq(&die_lock);
193 bust_spinlocks(1);
194 printk("%s: %04x [#%d] ", str, regs->int_code & 0xffff, ++die_counter);
195#ifdef CONFIG_PREEMPT
196 printk("PREEMPT ");
197#endif
198#ifdef CONFIG_SMP
199 printk("SMP ");
200#endif
201#ifdef CONFIG_DEBUG_PAGEALLOC
202 printk("DEBUG_PAGEALLOC");
203#endif
204 printk("\n");
205 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
206 print_modules();
207 show_regs(regs);
208 bust_spinlocks(0);
209 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
210 spin_unlock_irq(&die_lock);
211 if (in_interrupt())
212 panic("Fatal exception in interrupt");
213 if (panic_on_oops)
214 panic("Fatal exception: panic_on_oops");
215 oops_exit();
216 do_exit(SIGSEGV);
217}
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/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 * For dump_trace we have tree different stack to consider:
24 * - the panic stack which is used if the kernel stack has overflown
25 * - the asynchronous interrupt stack (cpu related)
26 * - the synchronous kernel stack (process related)
27 * The stack trace can start at any of the three stacks and can potentially
28 * touch all of them. The order is: panic stack, async stack, sync stack.
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 /* Follow the backchain. */
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 /* Zero backchain detected, check for interrupt frame. */
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
92static int show_address(void *data, unsigned long address)
93{
94 printk("([<%016lx>] %pSR)\n", address, (void *)address);
95 return 0;
96}
97
98static void show_trace(struct task_struct *task, unsigned long sp)
99{
100 if (!sp)
101 sp = task ? task->thread.ksp : current_stack_pointer();
102 printk("Call Trace:\n");
103 dump_trace(show_address, NULL, task, sp);
104 if (!task)
105 task = current;
106 debug_show_held_locks(task);
107}
108
109void show_stack(struct task_struct *task, unsigned long *sp)
110{
111 unsigned long *stack;
112 int i;
113
114 stack = sp;
115 if (!stack) {
116 if (!task)
117 stack = (unsigned long *)current_stack_pointer();
118 else
119 stack = (unsigned long *)task->thread.ksp;
120 }
121 for (i = 0; i < 20; i++) {
122 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
123 break;
124 if ((i * sizeof(long) % 32) == 0)
125 printk("%s ", i == 0 ? "" : "\n");
126 printk("%016lx ", *stack++);
127 }
128 printk("\n");
129 show_trace(task, (unsigned long)sp);
130}
131
132static void show_last_breaking_event(struct pt_regs *regs)
133{
134 printk("Last Breaking-Event-Address:\n");
135 printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
136}
137
138void show_registers(struct pt_regs *regs)
139{
140 struct psw_bits *psw = &psw_bits(regs->psw);
141 char *mode;
142
143 mode = user_mode(regs) ? "User" : "Krnl";
144 printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
145 if (!user_mode(regs))
146 printk(" (%pSR)", (void *)regs->psw.addr);
147 printk("\n");
148 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
149 "P:%x AS:%x CC:%x PM:%x", psw->r, psw->t, psw->i, psw->e,
150 psw->key, psw->m, psw->w, psw->p, psw->as, psw->cc, psw->pm);
151 printk(" RI:%x EA:%x", psw->ri, psw->eaba);
152 printk("\n%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
153 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
154 printk(" %016lx %016lx %016lx %016lx\n",
155 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
156 printk(" %016lx %016lx %016lx %016lx\n",
157 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
158 printk(" %016lx %016lx %016lx %016lx\n",
159 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
160 show_code(regs);
161}
162
163void show_regs(struct pt_regs *regs)
164{
165 show_regs_print_info(KERN_DEFAULT);
166 show_registers(regs);
167 /* Show stack backtrace if pt_regs is from kernel mode */
168 if (!user_mode(regs))
169 show_trace(NULL, regs->gprs[15]);
170 show_last_breaking_event(regs);
171}
172
173static DEFINE_SPINLOCK(die_lock);
174
175void die(struct pt_regs *regs, const char *str)
176{
177 static int die_counter;
178
179 oops_enter();
180 lgr_info_log();
181 debug_stop_all();
182 console_verbose();
183 spin_lock_irq(&die_lock);
184 bust_spinlocks(1);
185 printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
186 regs->int_code >> 17, ++die_counter);
187#ifdef CONFIG_PREEMPT
188 printk("PREEMPT ");
189#endif
190#ifdef CONFIG_SMP
191 printk("SMP ");
192#endif
193 if (debug_pagealloc_enabled())
194 printk("DEBUG_PAGEALLOC");
195 printk("\n");
196 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
197 print_modules();
198 show_regs(regs);
199 bust_spinlocks(0);
200 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
201 spin_unlock_irq(&die_lock);
202 if (in_interrupt())
203 panic("Fatal exception in interrupt");
204 if (panic_on_oops)
205 panic("Fatal exception: panic_on_oops");
206 oops_exit();
207 do_exit(SIGSEGV);
208}