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Linux/arch/riscv/kernel/stacktrace.c

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  1 /*
  2  * Copyright (C) 2008 ARM Limited
  3  * Copyright (C) 2014 Regents of the University of California
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  */
 14 
 15 #include <linux/export.h>
 16 #include <linux/kallsyms.h>
 17 #include <linux/sched.h>
 18 #include <linux/sched/debug.h>
 19 #include <linux/sched/task_stack.h>
 20 #include <linux/stacktrace.h>
 21 #include <linux/ftrace.h>
 22 
 23 #ifdef CONFIG_FRAME_POINTER
 24 
 25 struct stackframe {
 26         unsigned long fp;
 27         unsigned long ra;
 28 };
 29 
 30 static void notrace walk_stackframe(struct task_struct *task,
 31         struct pt_regs *regs, bool (*fn)(unsigned long, void *), void *arg)
 32 {
 33         unsigned long fp, sp, pc;
 34 
 35         if (regs) {
 36                 fp = GET_FP(regs);
 37                 sp = GET_USP(regs);
 38                 pc = GET_IP(regs);
 39         } else if (task == NULL || task == current) {
 40                 const register unsigned long current_sp __asm__ ("sp");
 41                 fp = (unsigned long)__builtin_frame_address(0);
 42                 sp = current_sp;
 43                 pc = (unsigned long)walk_stackframe;
 44         } else {
 45                 /* task blocked in __switch_to */
 46                 fp = task->thread.s[0];
 47                 sp = task->thread.sp;
 48                 pc = task->thread.ra;
 49         }
 50 
 51         for (;;) {
 52                 unsigned long low, high;
 53                 struct stackframe *frame;
 54 
 55                 if (unlikely(!__kernel_text_address(pc) || fn(pc, arg)))
 56                         break;
 57 
 58                 /* Validate frame pointer */
 59                 low = sp + sizeof(struct stackframe);
 60                 high = ALIGN(sp, THREAD_SIZE);
 61                 if (unlikely(fp < low || fp > high || fp & 0x7))
 62                         break;
 63                 /* Unwind stack frame */
 64                 frame = (struct stackframe *)fp - 1;
 65                 sp = fp;
 66                 fp = frame->fp;
 67 #ifdef HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
 68                 pc = ftrace_graph_ret_addr(current, NULL, frame->ra,
 69                                            (unsigned long *)(fp - 8));
 70 #else
 71                 pc = frame->ra - 0x4;
 72 #endif
 73         }
 74 }
 75 
 76 #else /* !CONFIG_FRAME_POINTER */
 77 
 78 static void notrace walk_stackframe(struct task_struct *task,
 79         struct pt_regs *regs, bool (*fn)(unsigned long, void *), void *arg)
 80 {
 81         unsigned long sp, pc;
 82         unsigned long *ksp;
 83 
 84         if (regs) {
 85                 sp = GET_USP(regs);
 86                 pc = GET_IP(regs);
 87         } else if (task == NULL || task == current) {
 88                 const register unsigned long current_sp __asm__ ("sp");
 89                 sp = current_sp;
 90                 pc = (unsigned long)walk_stackframe;
 91         } else {
 92                 /* task blocked in __switch_to */
 93                 sp = task->thread.sp;
 94                 pc = task->thread.ra;
 95         }
 96 
 97         if (unlikely(sp & 0x7))
 98                 return;
 99 
100         ksp = (unsigned long *)sp;
101         while (!kstack_end(ksp)) {
102                 if (__kernel_text_address(pc) && unlikely(fn(pc, arg)))
103                         break;
104                 pc = (*ksp++) - 0x4;
105         }
106 }
107 
108 #endif /* CONFIG_FRAME_POINTER */
109 
110 
111 static bool print_trace_address(unsigned long pc, void *arg)
112 {
113         print_ip_sym(pc);
114         return false;
115 }
116 
117 void show_stack(struct task_struct *task, unsigned long *sp)
118 {
119         pr_cont("Call Trace:\n");
120         walk_stackframe(task, NULL, print_trace_address, NULL);
121 }
122 
123 
124 static bool save_wchan(unsigned long pc, void *arg)
125 {
126         if (!in_sched_functions(pc)) {
127                 unsigned long *p = arg;
128                 *p = pc;
129                 return true;
130         }
131         return false;
132 }
133 
134 unsigned long get_wchan(struct task_struct *task)
135 {
136         unsigned long pc = 0;
137 
138         if (likely(task && task != current && task->state != TASK_RUNNING))
139                 walk_stackframe(task, NULL, save_wchan, &pc);
140         return pc;
141 }
142 
143 
144 #ifdef CONFIG_STACKTRACE
145 
146 static bool __save_trace(unsigned long pc, void *arg, bool nosched)
147 {
148         struct stack_trace *trace = arg;
149 
150         if (unlikely(nosched && in_sched_functions(pc)))
151                 return false;
152         if (unlikely(trace->skip > 0)) {
153                 trace->skip--;
154                 return false;
155         }
156 
157         trace->entries[trace->nr_entries++] = pc;
158         return (trace->nr_entries >= trace->max_entries);
159 }
160 
161 static bool save_trace(unsigned long pc, void *arg)
162 {
163         return __save_trace(pc, arg, false);
164 }
165 
166 /*
167  * Save stack-backtrace addresses into a stack_trace buffer.
168  */
169 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
170 {
171         walk_stackframe(tsk, NULL, save_trace, trace);
172         if (trace->nr_entries < trace->max_entries)
173                 trace->entries[trace->nr_entries++] = ULONG_MAX;
174 }
175 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
176 
177 void save_stack_trace(struct stack_trace *trace)
178 {
179         save_stack_trace_tsk(NULL, trace);
180 }
181 EXPORT_SYMBOL_GPL(save_stack_trace);
182 
183 #endif /* CONFIG_STACKTRACE */
184 

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