/* * trace_output.c * * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> * */ #include <linux/module.h>#include <linux/mutex.h>#include <linux/ftrace.h> #include "trace_output.h" /* must be a power of 2 */#define EVENT_HASHSIZE	128 DECLARE_RWSEM(trace_event_mutex); static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; static int next_event_type = __TRACE_LAST_TYPE + 1; int trace_print_seq(struct seq_file *m, struct trace_seq *s){	int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;	int ret; 	ret = seq_write(m, s->buffer, len); 	/*	 * Only reset this buffer if we successfully wrote to the	 * seq_file buffer.	 */	if (!ret)		trace_seq_init(s); 	return ret;} enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter){	struct trace_seq *s = &iter->seq;	struct trace_entry *entry = iter->ent;	struct bprint_entry *field;	int ret; 	trace_assign_type(field, entry); 	ret = trace_seq_bprintf(s, field->fmt, field->buf);	if (!ret)		return TRACE_TYPE_PARTIAL_LINE; 	return TRACE_TYPE_HANDLED;} enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter){	struct trace_seq *s = &iter->seq;	struct trace_entry *entry = iter->ent;	struct print_entry *field;	int ret; 	trace_assign_type(field, entry); 	ret = trace_seq_printf(s, "%s", field->buf);	if (!ret)		return TRACE_TYPE_PARTIAL_LINE; 	return TRACE_TYPE_HANDLED;} /** * trace_seq_printf - sequence printing of trace information * @s: trace sequence descriptor * @fmt: printf format string * * It returns 0 if the trace oversizes the buffer's free * space, 1 otherwise. * * The tracer may use either sequence operations or its own * copy to user routines. To simplify formating of a trace * trace_seq_printf is used to store strings into a special * buffer (@s). Then the output may be either used by * the sequencer or pulled into another buffer. */inttrace_seq_printf(struct trace_seq *s, const char *fmt, ...){	int len = (PAGE_SIZE - 1) - s->len;	va_list ap;	int ret; 	if (s->full || !len)		return 0; 	va_start(ap, fmt);	ret = vsnprintf(s->buffer + s->len, len, fmt, ap);	va_end(ap); 	/* If we can't write it all, don't bother writing anything */	if (ret >= len) {		s->full = 1;		return 0;	} 	s->len += ret; 	return 1;}EXPORT_SYMBOL_GPL(trace_seq_printf); /** * trace_seq_vprintf - sequence printing of trace information * @s: trace sequence descriptor * @fmt: printf format string * * The tracer may use either sequence operations or its own * copy to user routines. To simplify formating of a trace * trace_seq_printf is used to store strings into a special * buffer (@s). Then the output may be either used by * the sequencer or pulled into another buffer. */inttrace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args){	int len = (PAGE_SIZE - 1) - s->len;	int ret; 	if (s->full || !len)		return 0; 	ret = vsnprintf(s->buffer + s->len, len, fmt, args); 	/* If we can't write it all, don't bother writing anything */	if (ret >= len) {		s->full = 1;		return 0;	} 	s->len += ret; 	return len;}EXPORT_SYMBOL_GPL(trace_seq_vprintf); int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary){	int len = (PAGE_SIZE - 1) - s->len;	int ret; 	if (s->full || !len)		return 0; 	ret = bstr_printf(s->buffer + s->len, len, fmt, binary); 	/* If we can't write it all, don't bother writing anything */	if (ret >= len) {		s->full = 1;		return 0;	} 	s->len += ret; 	return len;} /** * trace_seq_puts - trace sequence printing of simple string * @s: trace sequence descriptor * @str: simple string to record * * The tracer may use either the sequence operations or its own * copy to user routines. This function records a simple string * into a special buffer (@s) for later retrieval by a sequencer * or other mechanism. */int trace_seq_puts(struct trace_seq *s, const char *str){	int len = strlen(str); 	if (s->full)		return 0; 	if (len > ((PAGE_SIZE - 1) - s->len)) {		s->full = 1;		return 0;	} 	memcpy(s->buffer + s->len, str, len);	s->len += len; 	return len;} int trace_seq_putc(struct trace_seq *s, unsigned char c){	if (s->full)		return 0; 	if (s->len >= (PAGE_SIZE - 1)) {		s->full = 1;		return 0;	} 	s->buffer[s->len++] = c; 	return 1;}EXPORT_SYMBOL(trace_seq_putc); int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len){	if (s->full)		return 0; 	if (len > ((PAGE_SIZE - 1) - s->len)) {		s->full = 1;		return 0;	} 	memcpy(s->buffer + s->len, mem, len);	s->len += len; 	return len;} int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len){	unsigned char hex[HEX_CHARS];	const unsigned char *data = mem;	int i, j; 	if (s->full)		return 0; #ifdef __BIG_ENDIAN	for (i = 0, j = 0; i < len; i++) {#else	for (i = len-1, j = 0; i >= 0; i--) {#endif		hex[j++] = hex_asc_hi(data[i]);		hex[j++] = hex_asc_lo(data[i]);	}	hex[j++] = ' '; 	return trace_seq_putmem(s, hex, j);} void *trace_seq_reserve(struct trace_seq *s, size_t len){	void *ret; 	if (s->full)		return NULL; 	if (len > ((PAGE_SIZE - 1) - s->len)) {		s->full = 1;		return NULL;	} 	ret = s->buffer + s->len;	s->len += len; 	return ret;} int trace_seq_path(struct trace_seq *s, const struct path *path){	unsigned char *p; 	if (s->full)		return 0; 	if (s->len >= (PAGE_SIZE - 1)) {		s->full = 1;		return 0;	} 	p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);	if (!IS_ERR(p)) {		p = mangle_path(s->buffer + s->len, p, "\n");		if (p) {			s->len = p - s->buffer;			return 1;		}	} else {		s->buffer[s->len++] = '?';		return 1;	} 	s->full = 1;	return 0;} const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,		       unsigned long flags,		       const struct trace_print_flags *flag_array){	unsigned long mask;	const char *str;	const char *ret = p->buffer + p->len;	int i, first = 1; 	for (i = 0;  flag_array[i].name && flags; i++) { 		mask = flag_array[i].mask;		if ((flags & mask) != mask)			continue; 		str = flag_array[i].name;		flags &= ~mask;		if (!first && delim)			trace_seq_puts(p, delim);		else			first = 0;		trace_seq_puts(p, str);	} 	/* check for left over flags */	if (flags) {		if (!first && delim)			trace_seq_puts(p, delim);		trace_seq_printf(p, "0x%lx", flags);	} 	trace_seq_putc(p, 0); 	return ret;}EXPORT_SYMBOL(ftrace_print_flags_seq); const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,			 const struct trace_print_flags *symbol_array){	int i;	const char *ret = p->buffer + p->len; 	for (i = 0;  symbol_array[i].name; i++) { 		if (val != symbol_array[i].mask)			continue; 		trace_seq_puts(p, symbol_array[i].name);		break;	} 	if (ret == (const char *)(p->buffer + p->len))		trace_seq_printf(p, "0x%lx", val);			trace_seq_putc(p, 0); 	return ret;}EXPORT_SYMBOL(ftrace_print_symbols_seq); #if BITS_PER_LONG == 32const char *ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,			 const struct trace_print_flags_u64 *symbol_array){	int i;	const char *ret = p->buffer + p->len; 	for (i = 0;  symbol_array[i].name; i++) { 		if (val != symbol_array[i].mask)			continue; 		trace_seq_puts(p, symbol_array[i].name);		break;	} 	if (ret == (const char *)(p->buffer + p->len))		trace_seq_printf(p, "0x%llx", val); 	trace_seq_putc(p, 0); 	return ret;}EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);#endif const char *ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len){	int i;	const char *ret = p->buffer + p->len; 	for (i = 0; i < buf_len; i++)		trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]); 	trace_seq_putc(p, 0); 	return ret;}EXPORT_SYMBOL(ftrace_print_hex_seq); #ifdef CONFIG_KRETPROBESstatic inline const char *kretprobed(const char *name){	static const char tramp_name[] = "kretprobe_trampoline";	int size = sizeof(tramp_name); 	if (strncmp(tramp_name, name, size) == 0)		return "[unknown/kretprobe'd]";	return name;}#elsestatic inline const char *kretprobed(const char *name){	return name;}#endif /* CONFIG_KRETPROBES */ static intseq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address){#ifdef CONFIG_KALLSYMS	char str[KSYM_SYMBOL_LEN];	const char *name; 	kallsyms_lookup(address, NULL, NULL, NULL, str); 	name = kretprobed(str); 	return trace_seq_printf(s, fmt, name);#endif	return 1;} static intseq_print_sym_offset(struct trace_seq *s, const char *fmt,		     unsigned long address){#ifdef CONFIG_KALLSYMS	char str[KSYM_SYMBOL_LEN];	const char *name; 	sprint_symbol(str, address);	name = kretprobed(str); 	return trace_seq_printf(s, fmt, name);#endif	return 1;} #ifndef CONFIG_64BIT# define IP_FMT "%08lx"#else# define IP_FMT "%016lx"#endif int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,		      unsigned long ip, unsigned long sym_flags){	struct file *file = NULL;	unsigned long vmstart = 0;	int ret = 1; 	if (s->full)		return 0; 	if (mm) {		const struct vm_area_struct *vma; 		down_read(&mm->mmap_sem);		vma = find_vma(mm, ip);		if (vma) {			file = vma->vm_file;			vmstart = vma->vm_start;		}		if (file) {			ret = trace_seq_path(s, &file->f_path);			if (ret)				ret = trace_seq_printf(s, "[+0x%lx]",						       ip - vmstart);		}		up_read(&mm->mmap_sem);	}	if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))		ret = trace_seq_printf(s, " <" IP_FMT ">", ip);	return ret;} intseq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,		      unsigned long sym_flags){	struct mm_struct *mm = NULL;	int ret = 1;	unsigned int i; 	if (trace_flags & TRACE_ITER_SYM_USEROBJ) {		struct task_struct *task;		/*		 * we do the lookup on the thread group leader,		 * since individual threads might have already quit!		 */

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