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TOMOYO Linux Cross Reference
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 <linux/sched/debug.h>
 18 #include <linux/sched/task_stack.h>
 19 #include <asm/processor.h>
 20 #include <asm/debug.h>
 21 #include <asm/dis.h>
 22 #include <asm/ipl.h>
 23 
 24 /*
 25  * For dump_trace we have tree different stack to consider:
 26  *   - the panic stack which is used if the kernel stack has overflown
 27  *   - the asynchronous interrupt stack (cpu related)
 28  *   - the synchronous kernel stack (process related)
 29  * The stack trace can start at any of the three stacks and can potentially
 30  * touch all of them. The order is: panic stack, async stack, sync stack.
 31  */
 32 static unsigned long
 33 __dump_trace(dump_trace_func_t func, void *data, unsigned long sp,
 34              unsigned long low, unsigned long high)
 35 {
 36         struct stack_frame *sf;
 37         struct pt_regs *regs;
 38 
 39         while (1) {
 40                 if (sp < low || sp > high - sizeof(*sf))
 41                         return sp;
 42                 sf = (struct stack_frame *) sp;
 43                 if (func(data, sf->gprs[8], 0))
 44                         return sp;
 45                 /* Follow the backchain. */
 46                 while (1) {
 47                         low = sp;
 48                         sp = sf->back_chain;
 49                         if (!sp)
 50                                 break;
 51                         if (sp <= low || sp > high - sizeof(*sf))
 52                                 return sp;
 53                         sf = (struct stack_frame *) sp;
 54                         if (func(data, sf->gprs[8], 1))
 55                                 return sp;
 56                 }
 57                 /* Zero backchain detected, check for interrupt frame. */
 58                 sp = (unsigned long) (sf + 1);
 59                 if (sp <= low || sp > high - sizeof(*regs))
 60                         return sp;
 61                 regs = (struct pt_regs *) sp;
 62                 if (!user_mode(regs)) {
 63                         if (func(data, regs->psw.addr, 1))
 64                                 return sp;
 65                 }
 66                 low = sp;
 67                 sp = regs->gprs[15];
 68         }
 69 }
 70 
 71 void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
 72                 unsigned long sp)
 73 {
 74         unsigned long frame_size;
 75 
 76         frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
 77 #ifdef CONFIG_CHECK_STACK
 78         sp = __dump_trace(func, data, sp,
 79                           S390_lowcore.panic_stack + frame_size - 4096,
 80                           S390_lowcore.panic_stack + frame_size);
 81 #endif
 82         sp = __dump_trace(func, data, sp,
 83                           S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
 84                           S390_lowcore.async_stack + frame_size);
 85         task = task ?: current;
 86         __dump_trace(func, data, sp,
 87                      (unsigned long)task_stack_page(task),
 88                      (unsigned long)task_stack_page(task) + THREAD_SIZE);
 89 }
 90 EXPORT_SYMBOL_GPL(dump_trace);
 91 
 92 static int show_address(void *data, unsigned long address, int reliable)
 93 {
 94         if (reliable)
 95                 printk(" [<%016lx>] %pSR \n", address, (void *)address);
 96         else
 97                 printk("([<%016lx>] %pSR)\n", address, (void *)address);
 98         return 0;
 99 }
100 
101 static void show_trace(struct task_struct *task, unsigned long sp)
102 {
103         if (!sp)
104                 sp = task ? task->thread.ksp : current_stack_pointer();
105         printk("Call Trace:\n");
106         dump_trace(show_address, NULL, task, sp);
107         if (!task)
108                 task = current;
109         debug_show_held_locks(task);
110 }
111 
112 void show_stack(struct task_struct *task, unsigned long *sp)
113 {
114         unsigned long *stack;
115         int i;
116 
117         stack = sp;
118         if (!stack) {
119                 if (!task)
120                         stack = (unsigned long *)current_stack_pointer();
121                 else
122                         stack = (unsigned long *)task->thread.ksp;
123         }
124         printk(KERN_DEFAULT "Stack:\n");
125         for (i = 0; i < 20; i++) {
126                 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
127                         break;
128                 if (i % 4 == 0)
129                         printk(KERN_DEFAULT "       ");
130                 pr_cont("%016lx%c", *stack++, i % 4 == 3 ? '\n' : ' ');
131         }
132         show_trace(task, (unsigned long)sp);
133 }
134 
135 static void show_last_breaking_event(struct pt_regs *regs)
136 {
137         printk("Last Breaking-Event-Address:\n");
138         printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
139 }
140 
141 void show_registers(struct pt_regs *regs)
142 {
143         struct psw_bits *psw = &psw_bits(regs->psw);
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                 pr_cont(" (%pSR)", (void *)regs->psw.addr);
150         pr_cont("\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", psw->r, psw->t, psw->i, psw->e,
153                psw->key, psw->m, psw->w, psw->p, psw->as, psw->cc, psw->pm);
154         pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);
155         printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
156                regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
157         printk("           %016lx %016lx %016lx %016lx\n",
158                regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
159         printk("           %016lx %016lx %016lx %016lx\n",
160                regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
161         printk("           %016lx %016lx %016lx %016lx\n",
162                regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
163         show_code(regs);
164 }
165 
166 void show_regs(struct pt_regs *regs)
167 {
168         show_regs_print_info(KERN_DEFAULT);
169         show_registers(regs);
170         /* Show stack backtrace if pt_regs is from kernel mode */
171         if (!user_mode(regs))
172                 show_trace(NULL, regs->gprs[15]);
173         show_last_breaking_event(regs);
174 }
175 
176 static DEFINE_SPINLOCK(die_lock);
177 
178 void die(struct pt_regs *regs, const char *str)
179 {
180         static int die_counter;
181 
182         oops_enter();
183         lgr_info_log();
184         debug_stop_all();
185         console_verbose();
186         spin_lock_irq(&die_lock);
187         bust_spinlocks(1);
188         printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
189                regs->int_code >> 17, ++die_counter);
190 #ifdef CONFIG_PREEMPT
191         pr_cont("PREEMPT ");
192 #endif
193 #ifdef CONFIG_SMP
194         pr_cont("SMP ");
195 #endif
196         if (debug_pagealloc_enabled())
197                 pr_cont("DEBUG_PAGEALLOC");
198         pr_cont("\n");
199         notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
200         print_modules();
201         show_regs(regs);
202         bust_spinlocks(0);
203         add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
204         spin_unlock_irq(&die_lock);
205         if (in_interrupt())
206                 panic("Fatal exception in interrupt");
207         if (panic_on_oops)
208                 panic("Fatal exception: panic_on_oops");
209         oops_exit();
210         do_exit(SIGSEGV);
211 }
212 

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