1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 1991, 1992 Linus Torvalds 4 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs 5 * Copyright (C) 2009 Matt Fleming 6 * Copyright (C) 2002 - 2012 Paul Mundt 7 */ 8 #include <linux/kallsyms.h> 9 #include <linux/ftrace.h> 10 #include <linux/debug_locks.h> 11 #include <linux/sched/debug.h> 12 #include <linux/sched/task_stack.h> 13 #include <linux/kdebug.h> 14 #include <linux/export.h> 15 #include <linux/uaccess.h> 16 #include <asm/unwinder.h> 17 #include <asm/stacktrace.h> 18 19 void dump_mem(const char *str, const char *loglvl, 20 unsigned long bottom, unsigned long top) 21 { 22 unsigned long p; 23 int i; 24 25 printk("%s%s(0x%08lx to 0x%08lx)\n", loglvl, str, bottom, top); 26 27 for (p = bottom & ~31; p < top; ) { 28 printk("%s%04lx: ", loglvl, p & 0xffff); 29 30 for (i = 0; i < 8; i++, p += 4) { 31 unsigned int val; 32 33 if (p < bottom || p >= top) 34 printk("%s ", loglvl); 35 else { 36 if (__get_user(val, (unsigned int __user *)p)) { 37 printk("%s\n", loglvl); 38 return; 39 } 40 printk("%s%08x ", loglvl, val); 41 } 42 } 43 printk("%s\n", loglvl); 44 } 45 } 46 47 void printk_address(unsigned long address, int reliable, const char *loglvl) 48 { 49 printk("%s [<%p>] %s%pS\n", loglvl, (void *) address, 50 reliable ? "" : "? ", (void *) address); 51 } 52 53 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 54 static void 55 print_ftrace_graph_addr(unsigned long addr, void *data, 56 const struct stacktrace_ops *ops, 57 struct thread_info *tinfo, int *graph) 58 { 59 struct task_struct *task = tinfo->task; 60 struct ftrace_ret_stack *ret_stack; 61 unsigned long ret_addr; 62 63 if (addr != (unsigned long)return_to_handler) 64 return; 65 66 if (!task->ret_stack) 67 return; 68 69 ret_stack = ftrace_graph_get_ret_stack(task, *graph); 70 if (!ret_stack) 71 return; 72 73 ret_addr = ret_stack->ret; 74 75 ops->address(data, ret_addr, 1); 76 77 (*graph)++; 78 } 79 #else 80 static inline void 81 print_ftrace_graph_addr(unsigned long addr, void *data, 82 const struct stacktrace_ops *ops, 83 struct thread_info *tinfo, int *graph) 84 { } 85 #endif 86 87 void 88 stack_reader_dump(struct task_struct *task, struct pt_regs *regs, 89 unsigned long *sp, const struct stacktrace_ops *ops, 90 void *data) 91 { 92 struct thread_info *context; 93 int graph = 0; 94 95 context = (struct thread_info *) 96 ((unsigned long)sp & (~(THREAD_SIZE - 1))); 97 98 while (!kstack_end(sp)) { 99 unsigned long addr = *sp++; 100 101 if (__kernel_text_address(addr)) { 102 ops->address(data, addr, 1); 103 104 print_ftrace_graph_addr(addr, data, ops, 105 context, &graph); 106 } 107 } 108 } 109 110 static int print_trace_stack(void *data, char *name) 111 { 112 printk("%s <%s> ", (char *)data, name); 113 return 0; 114 } 115 116 /* 117 * Print one address/symbol entries per line. 118 */ 119 static void print_trace_address(void *data, unsigned long addr, int reliable) 120 { 121 printk_address(addr, reliable, (char *)data); 122 } 123 124 static const struct stacktrace_ops print_trace_ops = { 125 .stack = print_trace_stack, 126 .address = print_trace_address, 127 }; 128 129 void show_trace(struct task_struct *tsk, unsigned long *sp, 130 struct pt_regs *regs, const char *loglvl) 131 { 132 if (regs && user_mode(regs)) 133 return; 134 135 printk("%s\nCall trace:\n", loglvl); 136 137 unwind_stack(tsk, regs, sp, &print_trace_ops, (void *)loglvl); 138 139 printk("%s\n", loglvl); 140 141 if (!tsk) 142 tsk = current; 143 144 debug_show_held_locks(tsk); 145 } 146 147 void show_stack(struct task_struct *tsk, unsigned long *sp, const char *loglvl) 148 { 149 unsigned long stack; 150 151 if (!tsk) 152 tsk = current; 153 if (tsk == current) 154 sp = (unsigned long *)current_stack_pointer; 155 else 156 sp = (unsigned long *)tsk->thread.sp; 157 158 stack = (unsigned long)sp; 159 dump_mem("Stack: ", loglvl, stack, THREAD_SIZE + 160 (unsigned long)task_stack_page(tsk)); 161 show_trace(tsk, sp, NULL, loglvl); 162 } 163