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146 lines
3.5 KiB
146 lines
3.5 KiB
/* |
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* Stack trace management functions |
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* |
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* Copyright (C) 2006-2009 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> |
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*/ |
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#include <linux/sched.h> |
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#include <linux/stacktrace.h> |
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#include <linux/module.h> |
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#include <linux/uaccess.h> |
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#include <asm/stacktrace.h> |
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static int save_stack_stack(void *data, char *name) |
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{ |
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return 0; |
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} |
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static void |
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__save_stack_address(void *data, unsigned long addr, bool reliable, bool nosched) |
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{ |
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struct stack_trace *trace = data; |
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#ifdef CONFIG_FRAME_POINTER |
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if (!reliable) |
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return; |
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#endif |
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if (nosched && in_sched_functions(addr)) |
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return; |
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if (trace->skip > 0) { |
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trace->skip--; |
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return; |
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} |
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if (trace->nr_entries < trace->max_entries) |
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trace->entries[trace->nr_entries++] = addr; |
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} |
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static void save_stack_address(void *data, unsigned long addr, int reliable) |
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{ |
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return __save_stack_address(data, addr, reliable, false); |
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} |
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static void |
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save_stack_address_nosched(void *data, unsigned long addr, int reliable) |
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{ |
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return __save_stack_address(data, addr, reliable, true); |
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} |
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static const struct stacktrace_ops save_stack_ops = { |
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.stack = save_stack_stack, |
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.address = save_stack_address, |
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.walk_stack = print_context_stack, |
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}; |
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static const struct stacktrace_ops save_stack_ops_nosched = { |
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.stack = save_stack_stack, |
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.address = save_stack_address_nosched, |
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.walk_stack = print_context_stack, |
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}; |
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/* |
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* Save stack-backtrace addresses into a stack_trace buffer. |
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*/ |
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void save_stack_trace(struct stack_trace *trace) |
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{ |
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dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace); |
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if (trace->nr_entries < trace->max_entries) |
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trace->entries[trace->nr_entries++] = ULONG_MAX; |
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} |
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EXPORT_SYMBOL_GPL(save_stack_trace); |
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void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) |
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{ |
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dump_trace(current, regs, NULL, 0, &save_stack_ops, trace); |
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if (trace->nr_entries < trace->max_entries) |
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trace->entries[trace->nr_entries++] = ULONG_MAX; |
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} |
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) |
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{ |
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dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace); |
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if (trace->nr_entries < trace->max_entries) |
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trace->entries[trace->nr_entries++] = ULONG_MAX; |
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} |
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |
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/* Userspace stacktrace - based on kernel/trace/trace_sysprof.c */ |
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struct stack_frame_user { |
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const void __user *next_fp; |
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unsigned long ret_addr; |
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}; |
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static int |
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copy_stack_frame(const void __user *fp, struct stack_frame_user *frame) |
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{ |
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int ret; |
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if (!access_ok(VERIFY_READ, fp, sizeof(*frame))) |
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return 0; |
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ret = 1; |
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pagefault_disable(); |
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if (__copy_from_user_inatomic(frame, fp, sizeof(*frame))) |
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ret = 0; |
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pagefault_enable(); |
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return ret; |
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} |
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static inline void __save_stack_trace_user(struct stack_trace *trace) |
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{ |
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const struct pt_regs *regs = task_pt_regs(current); |
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const void __user *fp = (const void __user *)regs->bp; |
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if (trace->nr_entries < trace->max_entries) |
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trace->entries[trace->nr_entries++] = regs->ip; |
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while (trace->nr_entries < trace->max_entries) { |
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struct stack_frame_user frame; |
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frame.next_fp = NULL; |
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frame.ret_addr = 0; |
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if (!copy_stack_frame(fp, &frame)) |
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break; |
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if ((unsigned long)fp < regs->sp) |
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break; |
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if (frame.ret_addr) { |
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trace->entries[trace->nr_entries++] = |
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frame.ret_addr; |
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} |
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if (fp == frame.next_fp) |
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break; |
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fp = frame.next_fp; |
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} |
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} |
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void save_stack_trace_user(struct stack_trace *trace) |
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{ |
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/* |
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* Trace user stack if we are not a kernel thread |
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*/ |
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if (current->mm) { |
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__save_stack_trace_user(trace); |
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} |
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if (trace->nr_entries < trace->max_entries) |
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trace->entries[trace->nr_entries++] = ULONG_MAX; |
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} |
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