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1// SPDX-License-Identifier: GPL-2.0
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>
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#include <asm/unwind.h>
25
26const char *stack_type_name(enum stack_type type)
27{
28 switch (type) {
29 case STACK_TYPE_TASK:
30 return "task";
31 case STACK_TYPE_IRQ:
32 return "irq";
33 case STACK_TYPE_NODAT:
34 return "nodat";
35 case STACK_TYPE_RESTART:
36 return "restart";
37 default:
38 return "unknown";
39 }
40}
41
42static inline bool in_stack(unsigned long sp, struct stack_info *info,
43 enum stack_type type, unsigned long low,
44 unsigned long high)
45{
46 if (sp < low || sp >= high)
47 return false;
48 info->type = type;
49 info->begin = low;
50 info->end = high;
51 return true;
52}
53
54static bool in_task_stack(unsigned long sp, struct task_struct *task,
55 struct stack_info *info)
56{
57 unsigned long stack;
58
59 stack = (unsigned long) task_stack_page(task);
60 return in_stack(sp, info, STACK_TYPE_TASK, stack, stack + THREAD_SIZE);
61}
62
63static bool in_irq_stack(unsigned long sp, struct stack_info *info)
64{
65 unsigned long frame_size, top;
66
67 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
68 top = S390_lowcore.async_stack + frame_size;
69 return in_stack(sp, info, STACK_TYPE_IRQ, top - THREAD_SIZE, top);
70}
71
72static bool in_nodat_stack(unsigned long sp, struct stack_info *info)
73{
74 unsigned long frame_size, top;
75
76 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
77 top = S390_lowcore.nodat_stack + frame_size;
78 return in_stack(sp, info, STACK_TYPE_NODAT, top - THREAD_SIZE, top);
79}
80
81static bool in_restart_stack(unsigned long sp, struct stack_info *info)
82{
83 unsigned long frame_size, top;
84
85 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
86 top = S390_lowcore.restart_stack + frame_size;
87 return in_stack(sp, info, STACK_TYPE_RESTART, top - THREAD_SIZE, top);
88}
89
90int get_stack_info(unsigned long sp, struct task_struct *task,
91 struct stack_info *info, unsigned long *visit_mask)
92{
93 if (!sp)
94 goto unknown;
95
96 task = task ? : current;
97
98 /* Check per-task stack */
99 if (in_task_stack(sp, task, info))
100 goto recursion_check;
101
102 if (task != current)
103 goto unknown;
104
105 /* Check per-cpu stacks */
106 if (!in_irq_stack(sp, info) &&
107 !in_nodat_stack(sp, info) &&
108 !in_restart_stack(sp, info))
109 goto unknown;
110
111recursion_check:
112 /*
113 * Make sure we don't iterate through any given stack more than once.
114 * If it comes up a second time then there's something wrong going on:
115 * just break out and report an unknown stack type.
116 */
117 if (*visit_mask & (1UL << info->type))
118 goto unknown;
119 *visit_mask |= 1UL << info->type;
120 return 0;
121unknown:
122 info->type = STACK_TYPE_UNKNOWN;
123 return -EINVAL;
124}
125
126void show_stack(struct task_struct *task, unsigned long *stack)
127{
128 struct unwind_state state;
129
130 printk("Call Trace:\n");
131 if (!task)
132 task = current;
133 unwind_for_each_frame(&state, task, NULL, (unsigned long) stack)
134 printk(state.reliable ? " [<%016lx>] %pSR \n" :
135 "([<%016lx>] %pSR)\n",
136 state.ip, (void *) state.ip);
137 debug_show_held_locks(task ? : current);
138}
139
140static void show_last_breaking_event(struct pt_regs *regs)
141{
142 printk("Last Breaking-Event-Address:\n");
143 printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
144}
145
146void show_registers(struct pt_regs *regs)
147{
148 struct psw_bits *psw = &psw_bits(regs->psw);
149 char *mode;
150
151 mode = user_mode(regs) ? "User" : "Krnl";
152 printk("%s PSW : %px %px", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
153 if (!user_mode(regs))
154 pr_cont(" (%pSR)", (void *)regs->psw.addr);
155 pr_cont("\n");
156 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
157 "P:%x AS:%x CC:%x PM:%x", psw->per, psw->dat, psw->io, psw->ext,
158 psw->key, psw->mcheck, psw->wait, psw->pstate, psw->as, psw->cc, psw->pm);
159 pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);
160 printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
161 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
162 printk(" %016lx %016lx %016lx %016lx\n",
163 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
164 printk(" %016lx %016lx %016lx %016lx\n",
165 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
166 printk(" %016lx %016lx %016lx %016lx\n",
167 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
168 show_code(regs);
169}
170
171void show_regs(struct pt_regs *regs)
172{
173 show_regs_print_info(KERN_DEFAULT);
174 show_registers(regs);
175 /* Show stack backtrace if pt_regs is from kernel mode */
176 if (!user_mode(regs))
177 show_stack(NULL, (unsigned long *) regs->gprs[15]);
178 show_last_breaking_event(regs);
179}
180
181static DEFINE_SPINLOCK(die_lock);
182
183void die(struct pt_regs *regs, const char *str)
184{
185 static int die_counter;
186
187 oops_enter();
188 lgr_info_log();
189 debug_stop_all();
190 console_verbose();
191 spin_lock_irq(&die_lock);
192 bust_spinlocks(1);
193 printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
194 regs->int_code >> 17, ++die_counter);
195#ifdef CONFIG_PREEMPT
196 pr_cont("PREEMPT ");
197#endif
198 pr_cont("SMP ");
199 if (debug_pagealloc_enabled())
200 pr_cont("DEBUG_PAGEALLOC");
201 pr_cont("\n");
202 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
203 print_modules();
204 show_regs(regs);
205 bust_spinlocks(0);
206 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
207 spin_unlock_irq(&die_lock);
208 if (in_interrupt())
209 panic("Fatal exception in interrupt");
210 if (panic_on_oops)
211 panic("Fatal exception: panic_on_oops");
212 oops_exit();
213 do_exit(SIGSEGV);
214}
1// SPDX-License-Identifier: GPL-2.0
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>
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#include <asm/unwind.h>
25
26const char *stack_type_name(enum stack_type type)
27{
28 switch (type) {
29 case STACK_TYPE_TASK:
30 return "task";
31 case STACK_TYPE_IRQ:
32 return "irq";
33 case STACK_TYPE_NODAT:
34 return "nodat";
35 case STACK_TYPE_RESTART:
36 return "restart";
37 default:
38 return "unknown";
39 }
40}
41EXPORT_SYMBOL_GPL(stack_type_name);
42
43static inline bool in_stack(unsigned long sp, struct stack_info *info,
44 enum stack_type type, unsigned long low,
45 unsigned long high)
46{
47 if (sp < low || sp >= high)
48 return false;
49 info->type = type;
50 info->begin = low;
51 info->end = high;
52 return true;
53}
54
55static bool in_task_stack(unsigned long sp, struct task_struct *task,
56 struct stack_info *info)
57{
58 unsigned long stack;
59
60 stack = (unsigned long) task_stack_page(task);
61 return in_stack(sp, info, STACK_TYPE_TASK, stack, stack + THREAD_SIZE);
62}
63
64static bool in_irq_stack(unsigned long sp, struct stack_info *info)
65{
66 unsigned long frame_size, top;
67
68 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
69 top = S390_lowcore.async_stack + frame_size;
70 return in_stack(sp, info, STACK_TYPE_IRQ, top - THREAD_SIZE, top);
71}
72
73static bool in_nodat_stack(unsigned long sp, struct stack_info *info)
74{
75 unsigned long frame_size, top;
76
77 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
78 top = S390_lowcore.nodat_stack + frame_size;
79 return in_stack(sp, info, STACK_TYPE_NODAT, top - THREAD_SIZE, top);
80}
81
82static bool in_mcck_stack(unsigned long sp, struct stack_info *info)
83{
84 unsigned long frame_size, top;
85
86 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
87 top = S390_lowcore.mcck_stack + frame_size;
88 return in_stack(sp, info, STACK_TYPE_MCCK, top - THREAD_SIZE, top);
89}
90
91static bool in_restart_stack(unsigned long sp, struct stack_info *info)
92{
93 unsigned long frame_size, top;
94
95 frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
96 top = S390_lowcore.restart_stack + frame_size;
97 return in_stack(sp, info, STACK_TYPE_RESTART, top - THREAD_SIZE, top);
98}
99
100int get_stack_info(unsigned long sp, struct task_struct *task,
101 struct stack_info *info, unsigned long *visit_mask)
102{
103 if (!sp)
104 goto unknown;
105
106 /* Sanity check: ABI requires SP to be aligned 8 bytes. */
107 if (sp & 0x7)
108 goto unknown;
109
110 /* Check per-task stack */
111 if (in_task_stack(sp, task, info))
112 goto recursion_check;
113
114 if (task != current)
115 goto unknown;
116
117 /* Check per-cpu stacks */
118 if (!in_irq_stack(sp, info) &&
119 !in_nodat_stack(sp, info) &&
120 !in_restart_stack(sp, info) &&
121 !in_mcck_stack(sp, info))
122 goto unknown;
123
124recursion_check:
125 /*
126 * Make sure we don't iterate through any given stack more than once.
127 * If it comes up a second time then there's something wrong going on:
128 * just break out and report an unknown stack type.
129 */
130 if (*visit_mask & (1UL << info->type))
131 goto unknown;
132 *visit_mask |= 1UL << info->type;
133 return 0;
134unknown:
135 info->type = STACK_TYPE_UNKNOWN;
136 return -EINVAL;
137}
138
139void show_stack(struct task_struct *task, unsigned long *stack,
140 const char *loglvl)
141{
142 struct unwind_state state;
143
144 printk("%sCall Trace:\n", loglvl);
145 unwind_for_each_frame(&state, task, NULL, (unsigned long) stack)
146 printk(state.reliable ? "%s [<%016lx>] %pSR \n" :
147 "%s([<%016lx>] %pSR)\n",
148 loglvl, state.ip, (void *) state.ip);
149 debug_show_held_locks(task ? : current);
150}
151
152static void show_last_breaking_event(struct pt_regs *regs)
153{
154 printk("Last Breaking-Event-Address:\n");
155 printk(" [<%016lx>] %pSR\n", regs->last_break, (void *)regs->last_break);
156}
157
158void show_registers(struct pt_regs *regs)
159{
160 struct psw_bits *psw = &psw_bits(regs->psw);
161 char *mode;
162
163 mode = user_mode(regs) ? "User" : "Krnl";
164 printk("%s PSW : %px %px", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
165 if (!user_mode(regs))
166 pr_cont(" (%pSR)", (void *)regs->psw.addr);
167 pr_cont("\n");
168 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
169 "P:%x AS:%x CC:%x PM:%x", psw->per, psw->dat, psw->io, psw->ext,
170 psw->key, psw->mcheck, psw->wait, psw->pstate, psw->as, psw->cc, psw->pm);
171 pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);
172 printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
173 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
174 printk(" %016lx %016lx %016lx %016lx\n",
175 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
176 printk(" %016lx %016lx %016lx %016lx\n",
177 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
178 printk(" %016lx %016lx %016lx %016lx\n",
179 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
180 show_code(regs);
181}
182
183void show_regs(struct pt_regs *regs)
184{
185 show_regs_print_info(KERN_DEFAULT);
186 show_registers(regs);
187 /* Show stack backtrace if pt_regs is from kernel mode */
188 if (!user_mode(regs))
189 show_stack(NULL, (unsigned long *) regs->gprs[15], KERN_DEFAULT);
190 show_last_breaking_event(regs);
191}
192
193static DEFINE_SPINLOCK(die_lock);
194
195void __noreturn die(struct pt_regs *regs, const char *str)
196{
197 static int die_counter;
198
199 oops_enter();
200 lgr_info_log();
201 debug_stop_all();
202 console_verbose();
203 spin_lock_irq(&die_lock);
204 bust_spinlocks(1);
205 printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
206 regs->int_code >> 17, ++die_counter);
207#ifdef CONFIG_PREEMPT
208 pr_cont("PREEMPT ");
209#elif defined(CONFIG_PREEMPT_RT)
210 pr_cont("PREEMPT_RT ");
211#endif
212 pr_cont("SMP ");
213 if (debug_pagealloc_enabled())
214 pr_cont("DEBUG_PAGEALLOC");
215 pr_cont("\n");
216 notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
217 print_modules();
218 show_regs(regs);
219 bust_spinlocks(0);
220 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
221 spin_unlock_irq(&die_lock);
222 if (in_interrupt())
223 panic("Fatal exception in interrupt");
224 if (panic_on_oops)
225 panic("Fatal exception: panic_on_oops");
226 oops_exit();
227 make_task_dead(SIGSEGV);
228}