301 lines
8.7 KiB
C
301 lines
8.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Common header file for probe-based Dynamic events.
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*
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* This code was copied from kernel/trace/trace_kprobe.h written by
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* Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
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*
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* Updates to make this generic:
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* Copyright (C) IBM Corporation, 2010-2011
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* Author: Srikar Dronamraju
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*/
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/tracefs.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/ptrace.h>
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#include <linux/perf_event.h>
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#include <linux/kprobes.h>
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#include <linux/stringify.h>
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#include <linux/limits.h>
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#include <linux/uaccess.h>
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#include <linux/bitops.h>
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#include <asm/bitsperlong.h>
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#include "trace.h"
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#include "trace_output.h"
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#define MAX_TRACE_ARGS 128
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#define MAX_ARGSTR_LEN 63
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#define MAX_ARRAY_LEN 64
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#define MAX_ARG_NAME_LEN 32
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#define MAX_STRING_SIZE PATH_MAX
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/* Reserved field names */
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#define FIELD_STRING_IP "__probe_ip"
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#define FIELD_STRING_RETIP "__probe_ret_ip"
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#define FIELD_STRING_FUNC "__probe_func"
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#undef DEFINE_FIELD
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#define DEFINE_FIELD(type, item, name, is_signed) \
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do { \
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ret = trace_define_field(event_call, #type, name, \
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offsetof(typeof(field), item), \
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sizeof(field.item), is_signed, \
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FILTER_OTHER); \
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if (ret) \
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return ret; \
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} while (0)
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/* Flags for trace_probe */
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#define TP_FLAG_TRACE 1
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#define TP_FLAG_PROFILE 2
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#define TP_FLAG_REGISTERED 4
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/* data_loc: data location, compatible with u32 */
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#define make_data_loc(len, offs) \
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(((u32)(len) << 16) | ((u32)(offs) & 0xffff))
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#define get_loc_len(dl) ((u32)(dl) >> 16)
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#define get_loc_offs(dl) ((u32)(dl) & 0xffff)
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static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
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{
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return (u8 *)ent + get_loc_offs(*dl);
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}
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static nokprobe_inline u32 update_data_loc(u32 loc, int consumed)
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{
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u32 maxlen = get_loc_len(loc);
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u32 offset = get_loc_offs(loc);
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return make_data_loc(maxlen - consumed, offset + consumed);
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}
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/* Printing function type */
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typedef int (*print_type_func_t)(struct trace_seq *, void *, void *);
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enum fetch_op {
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FETCH_OP_NOP = 0,
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// Stage 1 (load) ops
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FETCH_OP_REG, /* Register : .param = offset */
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FETCH_OP_STACK, /* Stack : .param = index */
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FETCH_OP_STACKP, /* Stack pointer */
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FETCH_OP_RETVAL, /* Return value */
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FETCH_OP_IMM, /* Immediate : .immediate */
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FETCH_OP_COMM, /* Current comm */
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FETCH_OP_ARG, /* Function argument : .param */
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FETCH_OP_FOFFS, /* File offset: .immediate */
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// Stage 2 (dereference) op
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FETCH_OP_DEREF, /* Dereference: .offset */
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// Stage 3 (store) ops
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FETCH_OP_ST_RAW, /* Raw: .size */
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FETCH_OP_ST_MEM, /* Mem: .offset, .size */
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FETCH_OP_ST_STRING, /* String: .offset, .size */
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// Stage 4 (modify) op
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FETCH_OP_MOD_BF, /* Bitfield: .basesize, .lshift, .rshift */
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// Stage 5 (loop) op
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FETCH_OP_LP_ARRAY, /* Array: .param = loop count */
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FETCH_OP_END,
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FETCH_NOP_SYMBOL, /* Unresolved Symbol holder */
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};
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struct fetch_insn {
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enum fetch_op op;
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union {
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unsigned int param;
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struct {
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unsigned int size;
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int offset;
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};
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struct {
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unsigned char basesize;
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unsigned char lshift;
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unsigned char rshift;
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};
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unsigned long immediate;
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void *data;
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};
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};
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/* fetch + deref*N + store + mod + end <= 16, this allows N=12, enough */
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#define FETCH_INSN_MAX 16
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/* Fetch type information table */
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struct fetch_type {
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const char *name; /* Name of type */
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size_t size; /* Byte size of type */
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int is_signed; /* Signed flag */
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print_type_func_t print; /* Print functions */
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const char *fmt; /* Fromat string */
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const char *fmttype; /* Name in format file */
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};
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/* For defining macros, define string/string_size types */
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typedef u32 string;
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typedef u32 string_size;
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#define PRINT_TYPE_FUNC_NAME(type) print_type_##type
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#define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
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/* Printing in basic type function template */
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#define DECLARE_BASIC_PRINT_TYPE_FUNC(type) \
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int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, void *data, void *ent);\
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extern const char PRINT_TYPE_FMT_NAME(type)[]
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DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
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DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
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DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
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DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
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DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
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DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
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DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
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DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
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DECLARE_BASIC_PRINT_TYPE_FUNC(x8);
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DECLARE_BASIC_PRINT_TYPE_FUNC(x16);
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DECLARE_BASIC_PRINT_TYPE_FUNC(x32);
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DECLARE_BASIC_PRINT_TYPE_FUNC(x64);
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DECLARE_BASIC_PRINT_TYPE_FUNC(string);
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DECLARE_BASIC_PRINT_TYPE_FUNC(symbol);
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/* Default (unsigned long) fetch type */
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#define __DEFAULT_FETCH_TYPE(t) x##t
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#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
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#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
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#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
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#define __ADDR_FETCH_TYPE(t) u##t
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#define _ADDR_FETCH_TYPE(t) __ADDR_FETCH_TYPE(t)
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#define ADDR_FETCH_TYPE _ADDR_FETCH_TYPE(BITS_PER_LONG)
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#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
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{.name = _name, \
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.size = _size, \
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.is_signed = sign, \
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.print = PRINT_TYPE_FUNC_NAME(ptype), \
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.fmt = PRINT_TYPE_FMT_NAME(ptype), \
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.fmttype = _fmttype, \
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}
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#define _ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
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__ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, #_fmttype)
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#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
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_ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, ptype)
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/* If ptype is an alias of atype, use this macro (show atype in format) */
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#define ASSIGN_FETCH_TYPE_ALIAS(ptype, atype, ftype, sign) \
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_ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, atype)
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#define ASSIGN_FETCH_TYPE_END {}
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#define MAX_ARRAY_LEN 64
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#ifdef CONFIG_KPROBE_EVENTS
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bool trace_kprobe_on_func_entry(struct trace_event_call *call);
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bool trace_kprobe_error_injectable(struct trace_event_call *call);
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#else
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static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call)
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{
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return false;
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}
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static inline bool trace_kprobe_error_injectable(struct trace_event_call *call)
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{
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return false;
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}
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#endif /* CONFIG_KPROBE_EVENTS */
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struct probe_arg {
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struct fetch_insn *code;
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bool dynamic;/* Dynamic array (string) is used */
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unsigned int offset; /* Offset from argument entry */
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unsigned int count; /* Array count */
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const char *name; /* Name of this argument */
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const char *comm; /* Command of this argument */
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char *fmt; /* Format string if needed */
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const struct fetch_type *type; /* Type of this argument */
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};
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struct trace_probe {
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unsigned int flags; /* For TP_FLAG_* */
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struct trace_event_class class;
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struct trace_event_call call;
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struct list_head files;
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ssize_t size; /* trace entry size */
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unsigned int nr_args;
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struct probe_arg args[];
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};
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struct event_file_link {
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struct trace_event_file *file;
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struct list_head list;
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};
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static inline bool trace_probe_is_enabled(struct trace_probe *tp)
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{
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return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
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}
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static inline bool trace_probe_is_registered(struct trace_probe *tp)
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{
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return !!(tp->flags & TP_FLAG_REGISTERED);
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}
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/* Check the name is good for event/group/fields */
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static inline bool is_good_name(const char *name)
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{
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if (!isalpha(*name) && *name != '_')
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return false;
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while (*++name != '\0') {
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if (!isalpha(*name) && !isdigit(*name) && *name != '_')
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return false;
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}
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return true;
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}
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static inline struct event_file_link *
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find_event_file_link(struct trace_probe *tp, struct trace_event_file *file)
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{
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struct event_file_link *link;
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list_for_each_entry(link, &tp->files, list)
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if (link->file == file)
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return link;
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return NULL;
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}
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#define TPARG_FL_RETURN BIT(0)
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#define TPARG_FL_KERNEL BIT(1)
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#define TPARG_FL_FENTRY BIT(2)
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#define TPARG_FL_MASK GENMASK(2, 0)
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extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
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char *arg, unsigned int flags);
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extern int traceprobe_update_arg(struct probe_arg *arg);
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extern void traceprobe_free_probe_arg(struct probe_arg *arg);
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extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
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extern int traceprobe_parse_event_name(const char **pevent,
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const char **pgroup, char *buf);
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extern int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return);
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#ifdef CONFIG_PERF_EVENTS
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extern struct trace_event_call *
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create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
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bool is_return);
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extern void destroy_local_trace_kprobe(struct trace_event_call *event_call);
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extern struct trace_event_call *
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create_local_trace_uprobe(char *name, unsigned long offs,
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unsigned long ref_ctr_offset, bool is_return);
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extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
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#endif
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extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
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size_t offset, struct trace_probe *tp);
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