1 files changed, 161 insertions, 0 deletions

diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
new file mode 100644
index 000000000000..933708677814
--- /dev/null
+++ b/kernel/trace/trace_probe.h
@@ -0,0 +1,161 @@
+/*
+ * Common header file for probe-based Dynamic events.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This code was copied from kernel/trace/trace_kprobe.h written by
+ * Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
+ *
+ * Updates to make this generic:
+ * Copyright (C) IBM Corporation, 2010-2011
+ * Author:     Srikar Dronamraju
+ */
+
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/debugfs.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/ptrace.h>
+#include <linux/perf_event.h>
+#include <linux/kprobes.h>
+#include <linux/stringify.h>
+#include <linux/limits.h>
+#include <linux/uaccess.h>
+#include <asm/bitsperlong.h>
+
+#include "trace.h"
+#include "trace_output.h"
+
+#define MAX_TRACE_ARGS          128
+#define MAX_ARGSTR_LEN          63
+#define MAX_EVENT_NAME_LEN      64
+#define MAX_STRING_SIZE         PATH_MAX
+
+/* Reserved field names */
+#define FIELD_STRING_IP         "__probe_ip"
+#define FIELD_STRING_RETIP      "__probe_ret_ip"
+#define FIELD_STRING_FUNC       "__probe_func"
+
+#undef DEFINE_FIELD
+#define DEFINE_FIELD(type, item, name, is_signed)                       \
+        do {                                                            \
+                ret = trace_define_field(event_call, #type, name,       \
+                                         offsetof(typeof(field), item), \
+                                         sizeof(field.item), is_signed, \
+                                         FILTER_OTHER);                 \
+                if (ret)                                                \
+                        return ret;                                     \
+        } while (0)
+
+
+/* Flags for trace_probe */
+#define TP_FLAG_TRACE           1
+#define TP_FLAG_PROFILE         2
+#define TP_FLAG_REGISTERED      4
+#define TP_FLAG_UPROBE          8
+
+
+/* data_rloc: data relative location, compatible with u32 */
+#define make_data_rloc(len, roffs)      \
+        (((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
+#define get_rloc_len(dl)                ((u32)(dl) >> 16)
+#define get_rloc_offs(dl)               ((u32)(dl) & 0xffff)
+
+/*
+ * Convert data_rloc to data_loc:
+ *  data_rloc stores the offset from data_rloc itself, but data_loc
+ *  stores the offset from event entry.
+ */
+#define convert_rloc_to_loc(dl, offs)   ((u32)(dl) + (offs))
+
+/* Data fetch function type */
+typedef void (*fetch_func_t)(struct pt_regs *, void *, void *);
+/* Printing function type */
+typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *, void *);
+
+/* Fetch types */
+enum {
+        FETCH_MTD_reg = 0,
+        FETCH_MTD_stack,
+        FETCH_MTD_retval,
+        FETCH_MTD_memory,
+        FETCH_MTD_symbol,
+        FETCH_MTD_deref,
+        FETCH_MTD_bitfield,
+        FETCH_MTD_END,
+};
+
+/* Fetch type information table */
+struct fetch_type {
+        const char              *name;          /* Name of type */
+        size_t                  size;           /* Byte size of type */
+        int                     is_signed;      /* Signed flag */
+        print_type_func_t       print;          /* Print functions */
+        const char              *fmt;           /* Fromat string */
+        const char              *fmttype;       /* Name in format file */
+        /* Fetch functions */
+        fetch_func_t            fetch[FETCH_MTD_END];
+};
+
+struct fetch_param {
+        fetch_func_t            fn;
+        void                    *data;
+};
+
+struct probe_arg {
+        struct fetch_param      fetch;
+        struct fetch_param      fetch_size;
+        unsigned int            offset; /* Offset from argument entry */
+        const char              *name;  /* Name of this argument */
+        const char              *comm;  /* Command of this argument */
+        const struct fetch_type *type;  /* Type of this argument */
+};
+
+static inline __kprobes void call_fetch(struct fetch_param *fprm,
+                                 struct pt_regs *regs, void *dest)
+{
+        return fprm->fn(regs, fprm->data, dest);
+}
+
+/* Check the name is good for event/group/fields */
+static inline int is_good_name(const char *name)
+{
+        if (!isalpha(*name) && *name != '_')
+                return 0;
+        while (*++name != '\0') {
+                if (!isalpha(*name) && !isdigit(*name) && *name != '_')
+                        return 0;
+        }
+        return 1;
+}
+
+extern int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
+                   struct probe_arg *parg, bool is_return, bool is_kprobe);
+
+extern int traceprobe_conflict_field_name(const char *name,
+                               struct probe_arg *args, int narg);
+
+extern void traceprobe_update_arg(struct probe_arg *arg);
+extern void traceprobe_free_probe_arg(struct probe_arg *arg);
+
+extern int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset);
+
+extern ssize_t traceprobe_probes_write(struct file *file,
+                const char __user *buffer, size_t count, loff_t *ppos,
+                int (*createfn)(int, char**));
+
+extern int traceprobe_command(const char *buf, int (*createfn)(int, char**));