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Linux/arch/s390/kernel/dumpstack.c

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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/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  */
 30 static 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                 if (func(data, sf->gprs[8], 0))
 42                         return sp;
 43                 /* Follow the backchain. */
 44                 while (1) {
 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                         if (func(data, sf->gprs[8], 1))
 53                                 return sp;
 54                 }
 55                 /* Zero backchain detected, check for interrupt frame. */
 56                 sp = (unsigned long) (sf + 1);
 57                 if (sp <= low || sp > high - sizeof(*regs))
 58                         return sp;
 59                 regs = (struct pt_regs *) sp;
 60                 if (!user_mode(regs)) {
 61                         if (func(data, regs->psw.addr, 1))
 62                                 return sp;
 63                 }
 64                 low = sp;
 65                 sp = regs->gprs[15];
 66         }
 67 }
 68 
 69 void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
 70                 unsigned long sp)
 71 {
 72         unsigned long frame_size;
 73 
 74         frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
 75 #ifdef CONFIG_CHECK_STACK
 76         sp = __dump_trace(func, data, sp,
 77                           S390_lowcore.panic_stack + frame_size - 4096,
 78                           S390_lowcore.panic_stack + frame_size);
 79 #endif
 80         sp = __dump_trace(func, data, sp,
 81                           S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
 82                           S390_lowcore.async_stack + frame_size);
 83         task = task ?: current;
 84         __dump_trace(func, data, sp,
 85                      (unsigned long)task_stack_page(task),
 86                      (unsigned long)task_stack_page(task) + THREAD_SIZE);
 87 }
 88 EXPORT_SYMBOL_GPL(dump_trace);
 89 
 90 static int show_address(void *data, unsigned long address, int reliable)
 91 {
 92         if (reliable)
 93                 printk(" [<%016lx>] %pSR \n", address, (void *)address);
 94         else
 95                 printk("([<%016lx>] %pSR)\n", address, (void *)address);
 96         return 0;
 97 }
 98 
 99 static void show_trace(struct task_struct *task, unsigned long sp)
100 {
101         if (!sp)
102                 sp = task ? task->thread.ksp : current_stack_pointer();
103         printk("Call Trace:\n");
104         dump_trace(show_address, NULL, task, sp);
105         if (!task)
106                 task = current;
107         debug_show_held_locks(task);
108 }
109 
110 void show_stack(struct task_struct *task, unsigned long *sp)
111 {
112         unsigned long *stack;
113         int i;
114 
115         stack = sp;
116         if (!stack) {
117                 if (!task)
118                         stack = (unsigned long *)current_stack_pointer();
119                 else
120                         stack = (unsigned long *)task->thread.ksp;
121         }
122         printk(KERN_DEFAULT "Stack:\n");
123         for (i = 0; i < 20; i++) {
124                 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
125                         break;
126                 if (i % 4 == 0)
127                         printk(KERN_DEFAULT "       ");
128                 pr_cont("%016lx%c", *stack++, i % 4 == 3 ? '\n' : ' ');
129         }
130         show_trace(task, (unsigned long)sp);
131 }
132 
133 static void show_last_breaking_event(struct pt_regs *regs)
134 {
135         printk("Last Breaking-Event-Address:\n");
136         printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
137 }
138 
139 void show_registers(struct pt_regs *regs)
140 {
141         struct psw_bits *psw = &psw_bits(regs->psw);
142         char *mode;
143 
144         mode = user_mode(regs) ? "User" : "Krnl";
145         printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
146         if (!user_mode(regs))
147                 pr_cont(" (%pSR)", (void *)regs->psw.addr);
148         pr_cont("\n");
149         printk("           R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
150                "P:%x AS:%x CC:%x PM:%x", psw->r, psw->t, psw->i, psw->e,
151                psw->key, psw->m, psw->w, psw->p, psw->as, psw->cc, psw->pm);
152         pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);
153         printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
154                regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
155         printk("           %016lx %016lx %016lx %016lx\n",
156                regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
157         printk("           %016lx %016lx %016lx %016lx\n",
158                regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
159         printk("           %016lx %016lx %016lx %016lx\n",
160                regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
161         show_code(regs);
162 }
163 
164 void show_regs(struct pt_regs *regs)
165 {
166         show_regs_print_info(KERN_DEFAULT);
167         show_registers(regs);
168         /* Show stack backtrace if pt_regs is from kernel mode */
169         if (!user_mode(regs))
170                 show_trace(NULL, regs->gprs[15]);
171         show_last_breaking_event(regs);
172 }
173 
174 static DEFINE_SPINLOCK(die_lock);
175 
176 void die(struct pt_regs *regs, const char *str)
177 {
178         static int die_counter;
179 
180         oops_enter();
181         lgr_info_log();
182         debug_stop_all();
183         console_verbose();
184         spin_lock_irq(&die_lock);
185         bust_spinlocks(1);
186         printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
187                regs->int_code >> 17, ++die_counter);
188 #ifdef CONFIG_PREEMPT
189         pr_cont("PREEMPT ");
190 #endif
191 #ifdef CONFIG_SMP
192         pr_cont("SMP ");
193 #endif
194         if (debug_pagealloc_enabled())
195                 pr_cont("DEBUG_PAGEALLOC");
196         pr_cont("\n");
197         notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
198         print_modules();
199         show_regs(regs);
200         bust_spinlocks(0);
201         add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
202         spin_unlock_irq(&die_lock);
203         if (in_interrupt())
204                 panic("Fatal exception in interrupt");
205         if (panic_on_oops)
206                 panic("Fatal exception: panic_on_oops");
207         oops_exit();
208         do_exit(SIGSEGV);
209 }
210 

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