2018-08-16 09:23:53 -06:00
|
|
|
// SPDX-License-Identifier: GPL-2.0
|
2012-04-09 03:11:44 -06:00
|
|
|
/*
|
|
|
|
* Common code for probe-based Dynamic events.
|
|
|
|
*
|
|
|
|
* This code was copied from kernel/trace/trace_kprobe.c written by
|
|
|
|
* Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
|
|
|
|
*
|
|
|
|
* Updates to make this generic:
|
|
|
|
* Copyright (C) IBM Corporation, 2010-2011
|
|
|
|
* Author: Srikar Dronamraju
|
|
|
|
*/
|
2017-02-07 04:21:28 -07:00
|
|
|
#define pr_fmt(fmt) "trace_probe: " fmt
|
2012-04-09 03:11:44 -06:00
|
|
|
|
|
|
|
#include "trace_probe.h"
|
|
|
|
|
|
|
|
const char *reserved_field_names[] = {
|
|
|
|
"common_type",
|
|
|
|
"common_flags",
|
|
|
|
"common_preempt_count",
|
|
|
|
"common_pid",
|
|
|
|
"common_tgid",
|
|
|
|
FIELD_STRING_IP,
|
|
|
|
FIELD_STRING_RETIP,
|
|
|
|
FIELD_STRING_FUNC,
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Printing in basic type function template */
|
2016-08-18 02:57:50 -06:00
|
|
|
#define DEFINE_BASIC_PRINT_TYPE_FUNC(tname, type, fmt) \
|
2018-04-25 06:16:36 -06:00
|
|
|
int PRINT_TYPE_FUNC_NAME(tname)(struct trace_seq *s, void *data, void *ent)\
|
2012-04-09 03:11:44 -06:00
|
|
|
{ \
|
2018-04-25 06:16:36 -06:00
|
|
|
trace_seq_printf(s, fmt, *(type *)data); \
|
2014-11-12 15:19:51 -07:00
|
|
|
return !trace_seq_has_overflowed(s); \
|
2012-04-09 03:11:44 -06:00
|
|
|
} \
|
2018-04-25 06:17:34 -06:00
|
|
|
const char PRINT_TYPE_FMT_NAME(tname)[] = fmt;
|
2012-04-09 03:11:44 -06:00
|
|
|
|
2016-08-18 02:59:21 -06:00
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(u8, u8, "%u")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(u16, u16, "%u")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(u32, u32, "%u")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(u64, u64, "%Lu")
|
2016-08-18 02:57:50 -06:00
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(s8, s8, "%d")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(s16, s16, "%d")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(s32, s32, "%d")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(s64, s64, "%Ld")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(x8, u8, "0x%x")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(x16, u16, "0x%x")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(x32, u32, "0x%x")
|
|
|
|
DEFINE_BASIC_PRINT_TYPE_FUNC(x64, u64, "0x%Lx")
|
2012-04-09 03:11:44 -06:00
|
|
|
|
2018-04-25 06:20:28 -06:00
|
|
|
int PRINT_TYPE_FUNC_NAME(symbol)(struct trace_seq *s, void *data, void *ent)
|
|
|
|
{
|
|
|
|
trace_seq_printf(s, "%pS", (void *)*(unsigned long *)data);
|
|
|
|
return !trace_seq_has_overflowed(s);
|
|
|
|
}
|
|
|
|
const char PRINT_TYPE_FMT_NAME(symbol)[] = "%pS";
|
|
|
|
|
2012-04-09 03:11:44 -06:00
|
|
|
/* Print type function for string type */
|
2018-04-25 06:16:36 -06:00
|
|
|
int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s, void *data, void *ent)
|
2012-04-09 03:11:44 -06:00
|
|
|
{
|
|
|
|
int len = *(u32 *)data >> 16;
|
|
|
|
|
|
|
|
if (!len)
|
2018-04-25 06:16:36 -06:00
|
|
|
trace_seq_puts(s, "(fault)");
|
2012-04-09 03:11:44 -06:00
|
|
|
else
|
2018-04-25 06:16:36 -06:00
|
|
|
trace_seq_printf(s, "\"%s\"",
|
2014-11-12 15:19:51 -07:00
|
|
|
(const char *)get_loc_data(data, ent));
|
|
|
|
return !trace_seq_has_overflowed(s);
|
2012-04-09 03:11:44 -06:00
|
|
|
}
|
|
|
|
|
2013-11-25 22:19:59 -07:00
|
|
|
const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
|
2012-04-09 03:11:44 -06:00
|
|
|
|
2018-04-25 06:18:32 -06:00
|
|
|
/* Fetch type information table */
|
|
|
|
static const struct fetch_type probe_fetch_types[] = {
|
|
|
|
/* Special types */
|
|
|
|
__ASSIGN_FETCH_TYPE("string", string, string, sizeof(u32), 1,
|
|
|
|
"__data_loc char[]"),
|
|
|
|
/* Basic types */
|
|
|
|
ASSIGN_FETCH_TYPE(u8, u8, 0),
|
|
|
|
ASSIGN_FETCH_TYPE(u16, u16, 0),
|
|
|
|
ASSIGN_FETCH_TYPE(u32, u32, 0),
|
|
|
|
ASSIGN_FETCH_TYPE(u64, u64, 0),
|
|
|
|
ASSIGN_FETCH_TYPE(s8, u8, 1),
|
|
|
|
ASSIGN_FETCH_TYPE(s16, u16, 1),
|
|
|
|
ASSIGN_FETCH_TYPE(s32, u32, 1),
|
|
|
|
ASSIGN_FETCH_TYPE(s64, u64, 1),
|
|
|
|
ASSIGN_FETCH_TYPE_ALIAS(x8, u8, u8, 0),
|
|
|
|
ASSIGN_FETCH_TYPE_ALIAS(x16, u16, u16, 0),
|
|
|
|
ASSIGN_FETCH_TYPE_ALIAS(x32, u32, u32, 0),
|
|
|
|
ASSIGN_FETCH_TYPE_ALIAS(x64, u64, u64, 0),
|
2018-04-25 06:20:28 -06:00
|
|
|
ASSIGN_FETCH_TYPE_ALIAS(symbol, ADDR_FETCH_TYPE, ADDR_FETCH_TYPE, 0),
|
2018-04-25 06:18:32 -06:00
|
|
|
|
|
|
|
ASSIGN_FETCH_TYPE_END
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct fetch_type *find_fetch_type(const char *type)
|
2012-04-09 03:11:44 -06:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (!type)
|
|
|
|
type = DEFAULT_FETCH_TYPE_STR;
|
|
|
|
|
|
|
|
/* Special case: bitfield */
|
|
|
|
if (*type == 'b') {
|
|
|
|
unsigned long bs;
|
|
|
|
|
|
|
|
type = strchr(type, '/');
|
|
|
|
if (!type)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
type++;
|
2012-09-26 14:08:38 -06:00
|
|
|
if (kstrtoul(type, 0, &bs))
|
2012-04-09 03:11:44 -06:00
|
|
|
goto fail;
|
|
|
|
|
|
|
|
switch (bs) {
|
|
|
|
case 8:
|
2018-04-25 06:18:32 -06:00
|
|
|
return find_fetch_type("u8");
|
2012-04-09 03:11:44 -06:00
|
|
|
case 16:
|
2018-04-25 06:18:32 -06:00
|
|
|
return find_fetch_type("u16");
|
2012-04-09 03:11:44 -06:00
|
|
|
case 32:
|
2018-04-25 06:18:32 -06:00
|
|
|
return find_fetch_type("u32");
|
2012-04-09 03:11:44 -06:00
|
|
|
case 64:
|
2018-04-25 06:18:32 -06:00
|
|
|
return find_fetch_type("u64");
|
2012-04-09 03:11:44 -06:00
|
|
|
default:
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-04-25 06:18:32 -06:00
|
|
|
for (i = 0; probe_fetch_types[i].name; i++) {
|
|
|
|
if (strcmp(type, probe_fetch_types[i].name) == 0)
|
|
|
|
return &probe_fetch_types[i];
|
2013-11-25 22:56:28 -07:00
|
|
|
}
|
2012-04-09 03:11:44 -06:00
|
|
|
|
|
|
|
fail:
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Split symbol and offset. */
|
2018-03-17 06:38:10 -06:00
|
|
|
int traceprobe_split_symbol_offset(char *symbol, long *offset)
|
2012-04-09 03:11:44 -06:00
|
|
|
{
|
|
|
|
char *tmp;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (!offset)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2018-03-17 06:38:10 -06:00
|
|
|
tmp = strpbrk(symbol, "+-");
|
2012-04-09 03:11:44 -06:00
|
|
|
if (tmp) {
|
2018-03-17 06:38:10 -06:00
|
|
|
ret = kstrtol(tmp, 0, offset);
|
2012-04-09 03:11:44 -06:00
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
*tmp = '\0';
|
|
|
|
} else
|
|
|
|
*offset = 0;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
|
|
|
|
|
|
|
|
static int parse_probe_vars(char *arg, const struct fetch_type *t,
|
2018-04-25 06:21:26 -06:00
|
|
|
struct fetch_insn *code, unsigned int flags)
|
2012-04-09 03:11:44 -06:00
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
unsigned long param;
|
|
|
|
|
|
|
|
if (strcmp(arg, "retval") == 0) {
|
2018-04-25 06:21:26 -06:00
|
|
|
if (flags & TPARG_FL_RETURN)
|
2018-04-25 06:18:03 -06:00
|
|
|
code->op = FETCH_OP_RETVAL;
|
2012-04-09 03:11:44 -06:00
|
|
|
else
|
|
|
|
ret = -EINVAL;
|
|
|
|
} else if (strncmp(arg, "stack", 5) == 0) {
|
|
|
|
if (arg[5] == '\0') {
|
2018-04-25 06:18:03 -06:00
|
|
|
code->op = FETCH_OP_STACKP;
|
2012-04-09 03:11:44 -06:00
|
|
|
} else if (isdigit(arg[5])) {
|
2012-09-26 14:08:38 -06:00
|
|
|
ret = kstrtoul(arg + 5, 10, ¶m);
|
2018-04-25 06:21:26 -06:00
|
|
|
if (ret || ((flags & TPARG_FL_KERNEL) &&
|
|
|
|
param > PARAM_MAX_STACK))
|
2012-04-09 03:11:44 -06:00
|
|
|
ret = -EINVAL;
|
|
|
|
else {
|
2018-04-25 06:18:03 -06:00
|
|
|
code->op = FETCH_OP_STACK;
|
|
|
|
code->param = (unsigned int)param;
|
2012-04-09 03:11:44 -06:00
|
|
|
}
|
|
|
|
} else
|
|
|
|
ret = -EINVAL;
|
2016-06-08 19:38:02 -06:00
|
|
|
} else if (strcmp(arg, "comm") == 0) {
|
2018-04-25 06:18:03 -06:00
|
|
|
code->op = FETCH_OP_COMM;
|
2018-04-25 06:21:26 -06:00
|
|
|
#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
|
|
|
|
} else if (((flags & TPARG_FL_MASK) ==
|
|
|
|
(TPARG_FL_KERNEL | TPARG_FL_FENTRY)) &&
|
|
|
|
strncmp(arg, "arg", 3) == 0) {
|
|
|
|
if (!isdigit(arg[3]))
|
|
|
|
return -EINVAL;
|
|
|
|
ret = kstrtoul(arg + 3, 10, ¶m);
|
|
|
|
if (ret || !param || param > PARAM_MAX_STACK)
|
|
|
|
return -EINVAL;
|
|
|
|
code->op = FETCH_OP_ARG;
|
|
|
|
code->param = (unsigned int)param - 1;
|
|
|
|
#endif
|
2012-04-09 03:11:44 -06:00
|
|
|
} else
|
|
|
|
ret = -EINVAL;
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Recursive argument parser */
|
2018-04-25 06:18:03 -06:00
|
|
|
static int
|
|
|
|
parse_probe_arg(char *arg, const struct fetch_type *type,
|
|
|
|
struct fetch_insn **pcode, struct fetch_insn *end,
|
2018-04-25 06:21:26 -06:00
|
|
|
unsigned int flags)
|
2012-04-09 03:11:44 -06:00
|
|
|
{
|
2018-04-25 06:18:03 -06:00
|
|
|
struct fetch_insn *code = *pcode;
|
2012-04-09 03:11:44 -06:00
|
|
|
unsigned long param;
|
2018-10-12 10:50:22 -06:00
|
|
|
long offset = 0;
|
2012-04-09 03:11:44 -06:00
|
|
|
char *tmp;
|
2013-11-25 22:56:28 -07:00
|
|
|
int ret = 0;
|
2012-04-09 03:11:44 -06:00
|
|
|
|
|
|
|
switch (arg[0]) {
|
|
|
|
case '$':
|
2018-04-25 06:21:26 -06:00
|
|
|
ret = parse_probe_vars(arg + 1, type, code, flags);
|
2012-04-09 03:11:44 -06:00
|
|
|
break;
|
|
|
|
|
|
|
|
case '%': /* named register */
|
|
|
|
ret = regs_query_register_offset(arg + 1);
|
|
|
|
if (ret >= 0) {
|
2018-04-25 06:18:03 -06:00
|
|
|
code->op = FETCH_OP_REG;
|
|
|
|
code->param = (unsigned int)ret;
|
2012-04-09 03:11:44 -06:00
|
|
|
ret = 0;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
2013-11-24 21:42:47 -07:00
|
|
|
case '@': /* memory, file-offset or symbol */
|
2012-04-09 03:11:44 -06:00
|
|
|
if (isdigit(arg[1])) {
|
2012-09-26 14:08:38 -06:00
|
|
|
ret = kstrtoul(arg + 1, 0, ¶m);
|
2012-04-09 03:11:44 -06:00
|
|
|
if (ret)
|
|
|
|
break;
|
2018-04-25 06:18:03 -06:00
|
|
|
/* load address */
|
|
|
|
code->op = FETCH_OP_IMM;
|
|
|
|
code->immediate = param;
|
2013-11-24 21:42:47 -07:00
|
|
|
} else if (arg[1] == '+') {
|
|
|
|
/* kprobes don't support file offsets */
|
2018-04-25 06:21:26 -06:00
|
|
|
if (flags & TPARG_FL_KERNEL)
|
2013-11-24 21:42:47 -07:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ret = kstrtol(arg + 2, 0, &offset);
|
|
|
|
if (ret)
|
|
|
|
break;
|
|
|
|
|
2018-04-25 06:18:03 -06:00
|
|
|
code->op = FETCH_OP_FOFFS;
|
|
|
|
code->immediate = (unsigned long)offset; // imm64?
|
2012-04-09 03:11:44 -06:00
|
|
|
} else {
|
2013-07-03 03:34:23 -06:00
|
|
|
/* uprobes don't support symbols */
|
2018-04-25 06:21:26 -06:00
|
|
|
if (!(flags & TPARG_FL_KERNEL))
|
2013-07-03 03:34:23 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
2018-08-28 10:18:43 -06:00
|
|
|
/* Preserve symbol for updating */
|
|
|
|
code->op = FETCH_NOP_SYMBOL;
|
|
|
|
code->data = kstrdup(arg + 1, GFP_KERNEL);
|
|
|
|
if (!code->data)
|
|
|
|
return -ENOMEM;
|
|
|
|
if (++code == end)
|
|
|
|
return -E2BIG;
|
2012-04-09 03:11:44 -06:00
|
|
|
|
2018-04-25 06:18:03 -06:00
|
|
|
code->op = FETCH_OP_IMM;
|
2018-08-28 10:18:43 -06:00
|
|
|
code->immediate = 0;
|
2012-04-09 03:11:44 -06:00
|
|
|
}
|
2018-04-25 06:18:03 -06:00
|
|
|
/* These are fetching from memory */
|
|
|
|
if (++code == end)
|
|
|
|
return -E2BIG;
|
|
|
|
*pcode = code;
|
|
|
|
code->op = FETCH_OP_DEREF;
|
|
|
|
code->offset = offset;
|
2012-04-09 03:11:44 -06:00
|
|
|
break;
|
|
|
|
|
|
|
|
case '+': /* deref memory */
|
2012-09-26 14:08:38 -06:00
|
|
|
arg++; /* Skip '+', because kstrtol() rejects it. */
|
2012-04-09 03:11:44 -06:00
|
|
|
case '-':
|
|
|
|
tmp = strchr(arg, '(');
|
|
|
|
if (!tmp)
|
2018-04-25 06:18:03 -06:00
|
|
|
return -EINVAL;
|
2012-04-09 03:11:44 -06:00
|
|
|
|
|
|
|
*tmp = '\0';
|
2012-09-26 14:08:38 -06:00
|
|
|
ret = kstrtol(arg, 0, &offset);
|
2012-04-09 03:11:44 -06:00
|
|
|
if (ret)
|
|
|
|
break;
|
|
|
|
|
|
|
|
arg = tmp + 1;
|
|
|
|
tmp = strrchr(arg, ')');
|
|
|
|
|
|
|
|
if (tmp) {
|
2018-04-25 06:18:32 -06:00
|
|
|
const struct fetch_type *t2 = find_fetch_type(NULL);
|
2012-04-09 03:11:44 -06:00
|
|
|
|
|
|
|
*tmp = '\0';
|
2018-04-25 06:21:26 -06:00
|
|
|
ret = parse_probe_arg(arg, t2, &code, end, flags);
|
2012-04-09 03:11:44 -06:00
|
|
|
if (ret)
|
2018-04-25 06:18:03 -06:00
|
|
|
break;
|
|
|
|
if (code->op == FETCH_OP_COMM)
|
|
|
|
return -EINVAL;
|
|
|
|
if (++code == end)
|
|
|
|
return -E2BIG;
|
|
|
|
*pcode = code;
|
|
|
|
|
|
|
|
code->op = FETCH_OP_DEREF;
|
|
|
|
code->offset = offset;
|
2012-04-09 03:11:44 -06:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
2018-04-25 06:18:03 -06:00
|
|
|
if (!ret && code->op == FETCH_OP_NOP) {
|
|
|
|
/* Parsed, but do not find fetch method */
|
2012-04-09 03:11:44 -06:00
|
|
|
ret = -EINVAL;
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define BYTES_TO_BITS(nb) ((BITS_PER_LONG * (nb)) / sizeof(long))
|
|
|
|
|
|
|
|
/* Bitfield type needs to be parsed into a fetch function */
|
|
|
|
static int __parse_bitfield_probe_arg(const char *bf,
|
|
|
|
const struct fetch_type *t,
|
2018-04-25 06:18:03 -06:00
|
|
|
struct fetch_insn **pcode)
|
2012-04-09 03:11:44 -06:00
|
|
|
{
|
2018-04-25 06:18:03 -06:00
|
|
|
struct fetch_insn *code = *pcode;
|
2012-04-09 03:11:44 -06:00
|
|
|
unsigned long bw, bo;
|
|
|
|
char *tail;
|
|
|
|
|
|
|
|
if (*bf != 'b')
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
bw = simple_strtoul(bf + 1, &tail, 0); /* Use simple one */
|
|
|
|
|
|
|
|
if (bw == 0 || *tail != '@')
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
bf = tail + 1;
|
|
|
|
bo = simple_strtoul(bf, &tail, 0);
|
|
|
|
|
|
|
|
if (tail == bf || *tail != '/')
|
|
|
|
return -EINVAL;
|
2018-04-25 06:18:03 -06:00
|
|
|
code++;
|
|
|
|
if (code->op != FETCH_OP_NOP)
|
|
|
|
return -E2BIG;
|
|
|
|
*pcode = code;
|
2012-04-09 03:11:44 -06:00
|
|
|
|
2018-04-25 06:18:03 -06:00
|
|
|
code->op = FETCH_OP_MOD_BF;
|
|
|
|
code->lshift = BYTES_TO_BITS(t->size) - (bw + bo);
|
|
|
|
code->rshift = BYTES_TO_BITS(t->size) - bw;
|
|
|
|
code->basesize = t->size;
|
2012-04-09 03:11:44 -06:00
|
|
|
|
|
|
|
return (BYTES_TO_BITS(t->size) < (bw + bo)) ? -EINVAL : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* String length checking wrapper */
|
|
|
|
int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
|
2018-04-25 06:21:26 -06:00
|
|
|
struct probe_arg *parg, unsigned int flags)
|
2012-04-09 03:11:44 -06:00
|
|
|
{
|
2018-04-25 06:21:55 -06:00
|
|
|
struct fetch_insn *code, *scode, *tmp = NULL;
|
|
|
|
char *t, *t2;
|
|
|
|
int ret, len;
|
2012-04-09 03:11:44 -06:00
|
|
|
|
|
|
|
if (strlen(arg) > MAX_ARGSTR_LEN) {
|
|
|
|
pr_info("Argument is too long.: %s\n", arg);
|
|
|
|
return -ENOSPC;
|
|
|
|
}
|
|
|
|
parg->comm = kstrdup(arg, GFP_KERNEL);
|
|
|
|
if (!parg->comm) {
|
|
|
|
pr_info("Failed to allocate memory for command '%s'.\n", arg);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
2018-04-25 06:21:55 -06:00
|
|
|
t = strchr(arg, ':');
|
2012-04-09 03:11:44 -06:00
|
|
|
if (t) {
|
2018-04-25 06:21:55 -06:00
|
|
|
*t = '\0';
|
|
|
|
t2 = strchr(++t, '[');
|
|
|
|
if (t2) {
|
|
|
|
*t2 = '\0';
|
|
|
|
parg->count = simple_strtoul(t2 + 1, &t2, 0);
|
|
|
|
if (strcmp(t2, "]") || parg->count == 0)
|
|
|
|
return -EINVAL;
|
|
|
|
if (parg->count > MAX_ARRAY_LEN)
|
|
|
|
return -E2BIG;
|
|
|
|
}
|
2012-04-09 03:11:44 -06:00
|
|
|
}
|
2016-06-08 19:38:02 -06:00
|
|
|
/*
|
|
|
|
* The default type of $comm should be "string", and it can't be
|
|
|
|
* dereferenced.
|
|
|
|
*/
|
|
|
|
if (!t && strcmp(arg, "$comm") == 0)
|
2018-04-25 06:21:55 -06:00
|
|
|
parg->type = find_fetch_type("string");
|
|
|
|
else
|
|
|
|
parg->type = find_fetch_type(t);
|
2012-04-09 03:11:44 -06:00
|
|
|
if (!parg->type) {
|
|
|
|
pr_info("Unsupported type: %s\n", t);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
parg->offset = *size;
|
2018-04-25 06:21:55 -06:00
|
|
|
*size += parg->type->size * (parg->count ?: 1);
|
|
|
|
|
|
|
|
if (parg->count) {
|
|
|
|
len = strlen(parg->type->fmttype) + 6;
|
|
|
|
parg->fmt = kmalloc(len, GFP_KERNEL);
|
|
|
|
if (!parg->fmt)
|
|
|
|
return -ENOMEM;
|
|
|
|
snprintf(parg->fmt, len, "%s[%d]", parg->type->fmttype,
|
|
|
|
parg->count);
|
|
|
|
}
|
2012-04-09 03:11:44 -06:00
|
|
|
|
2018-04-25 06:18:03 -06:00
|
|
|
code = tmp = kzalloc(sizeof(*code) * FETCH_INSN_MAX, GFP_KERNEL);
|
|
|
|
if (!code)
|
|
|
|
return -ENOMEM;
|
|
|
|
code[FETCH_INSN_MAX - 1].op = FETCH_OP_END;
|
|
|
|
|
|
|
|
ret = parse_probe_arg(arg, parg->type, &code, &code[FETCH_INSN_MAX - 1],
|
2018-04-25 06:21:26 -06:00
|
|
|
flags);
|
2018-04-25 06:18:03 -06:00
|
|
|
if (ret)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
/* Store operation */
|
|
|
|
if (!strcmp(parg->type->name, "string")) {
|
|
|
|
if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_IMM &&
|
|
|
|
code->op != FETCH_OP_COMM) {
|
|
|
|
pr_info("string only accepts memory or address.\n");
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto fail;
|
|
|
|
}
|
2018-04-25 06:21:55 -06:00
|
|
|
if (code->op != FETCH_OP_DEREF || parg->count) {
|
|
|
|
/*
|
|
|
|
* IMM and COMM is pointing actual address, those must
|
|
|
|
* be kept, and if parg->count != 0, this is an array
|
|
|
|
* of string pointers instead of string address itself.
|
|
|
|
*/
|
2018-04-25 06:18:03 -06:00
|
|
|
code++;
|
2018-04-25 06:21:55 -06:00
|
|
|
if (code->op != FETCH_OP_NOP) {
|
|
|
|
ret = -E2BIG;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
2018-04-25 06:18:03 -06:00
|
|
|
code->op = FETCH_OP_ST_STRING; /* In DEREF case, replace it */
|
2018-04-25 06:21:55 -06:00
|
|
|
code->size = parg->type->size;
|
2018-04-25 06:18:03 -06:00
|
|
|
parg->dynamic = true;
|
|
|
|
} else if (code->op == FETCH_OP_DEREF) {
|
|
|
|
code->op = FETCH_OP_ST_MEM;
|
|
|
|
code->size = parg->type->size;
|
|
|
|
} else {
|
|
|
|
code++;
|
|
|
|
if (code->op != FETCH_OP_NOP) {
|
|
|
|
ret = -E2BIG;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
code->op = FETCH_OP_ST_RAW;
|
|
|
|
code->size = parg->type->size;
|
|
|
|
}
|
2018-04-25 06:21:55 -06:00
|
|
|
scode = code;
|
2018-04-25 06:18:03 -06:00
|
|
|
/* Modify operation */
|
|
|
|
if (t != NULL) {
|
|
|
|
ret = __parse_bitfield_probe_arg(t, parg->type, &code);
|
|
|
|
if (ret)
|
|
|
|
goto fail;
|
2012-04-09 03:11:44 -06:00
|
|
|
}
|
2018-04-25 06:21:55 -06:00
|
|
|
/* Loop(Array) operation */
|
|
|
|
if (parg->count) {
|
|
|
|
if (scode->op != FETCH_OP_ST_MEM &&
|
|
|
|
scode->op != FETCH_OP_ST_STRING) {
|
|
|
|
pr_info("array only accepts memory or address\n");
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
code++;
|
|
|
|
if (code->op != FETCH_OP_NOP) {
|
|
|
|
ret = -E2BIG;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
code->op = FETCH_OP_LP_ARRAY;
|
|
|
|
code->param = parg->count;
|
|
|
|
}
|
2018-04-25 06:18:03 -06:00
|
|
|
code++;
|
|
|
|
code->op = FETCH_OP_END;
|
|
|
|
|
|
|
|
/* Shrink down the code buffer */
|
|
|
|
parg->code = kzalloc(sizeof(*code) * (code - tmp + 1), GFP_KERNEL);
|
|
|
|
if (!parg->code)
|
|
|
|
ret = -ENOMEM;
|
|
|
|
else
|
|
|
|
memcpy(parg->code, tmp, sizeof(*code) * (code - tmp + 1));
|
|
|
|
|
|
|
|
fail:
|
2018-08-28 10:18:43 -06:00
|
|
|
if (ret) {
|
|
|
|
for (code = tmp; code < tmp + FETCH_INSN_MAX; code++)
|
|
|
|
if (code->op == FETCH_NOP_SYMBOL)
|
|
|
|
kfree(code->data);
|
|
|
|
}
|
2018-04-25 06:18:03 -06:00
|
|
|
kfree(tmp);
|
2012-04-09 03:11:44 -06:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Return 1 if name is reserved or already used by another argument */
|
|
|
|
int traceprobe_conflict_field_name(const char *name,
|
|
|
|
struct probe_arg *args, int narg)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++)
|
|
|
|
if (strcmp(reserved_field_names[i], name) == 0)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
for (i = 0; i < narg; i++)
|
|
|
|
if (strcmp(args[i].name, name) == 0)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void traceprobe_free_probe_arg(struct probe_arg *arg)
|
|
|
|
{
|
2018-08-28 10:18:43 -06:00
|
|
|
struct fetch_insn *code = arg->code;
|
|
|
|
|
|
|
|
while (code && code->op != FETCH_OP_END) {
|
|
|
|
if (code->op == FETCH_NOP_SYMBOL)
|
|
|
|
kfree(code->data);
|
|
|
|
code++;
|
|
|
|
}
|
2018-04-25 06:18:03 -06:00
|
|
|
kfree(arg->code);
|
2012-04-09 03:11:44 -06:00
|
|
|
kfree(arg->name);
|
|
|
|
kfree(arg->comm);
|
2018-04-25 06:21:55 -06:00
|
|
|
kfree(arg->fmt);
|
2012-04-09 03:11:44 -06:00
|
|
|
}
|
|
|
|
|
2018-08-28 10:18:43 -06:00
|
|
|
int traceprobe_update_arg(struct probe_arg *arg)
|
|
|
|
{
|
|
|
|
struct fetch_insn *code = arg->code;
|
|
|
|
long offset;
|
|
|
|
char *tmp;
|
|
|
|
char c;
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
while (code && code->op != FETCH_OP_END) {
|
|
|
|
if (code->op == FETCH_NOP_SYMBOL) {
|
|
|
|
if (code[1].op != FETCH_OP_IMM)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2018-11-01 08:29:28 -06:00
|
|
|
tmp = strpbrk(code->data, "+-");
|
2018-08-28 10:18:43 -06:00
|
|
|
if (tmp)
|
|
|
|
c = *tmp;
|
|
|
|
ret = traceprobe_split_symbol_offset(code->data,
|
|
|
|
&offset);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
code[1].immediate =
|
|
|
|
(unsigned long)kallsyms_lookup_name(code->data);
|
|
|
|
if (tmp)
|
|
|
|
*tmp = c;
|
|
|
|
if (!code[1].immediate)
|
|
|
|
return -ENOENT;
|
|
|
|
code[1].immediate += offset;
|
|
|
|
}
|
|
|
|
code++;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2018-04-25 06:21:55 -06:00
|
|
|
/* When len=0, we just calculate the needed length */
|
|
|
|
#define LEN_OR_ZERO (len ? len - pos : 0)
|
2013-07-03 01:09:02 -06:00
|
|
|
static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
|
|
|
|
bool is_return)
|
|
|
|
{
|
2018-04-25 06:21:55 -06:00
|
|
|
struct probe_arg *parg;
|
|
|
|
int i, j;
|
2013-07-03 01:09:02 -06:00
|
|
|
int pos = 0;
|
|
|
|
const char *fmt, *arg;
|
|
|
|
|
|
|
|
if (!is_return) {
|
|
|
|
fmt = "(%lx)";
|
|
|
|
arg = "REC->" FIELD_STRING_IP;
|
|
|
|
} else {
|
|
|
|
fmt = "(%lx <- %lx)";
|
|
|
|
arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
|
|
|
|
}
|
|
|
|
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
|
|
|
|
|
|
|
|
for (i = 0; i < tp->nr_args; i++) {
|
2018-04-25 06:21:55 -06:00
|
|
|
parg = tp->args + i;
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=", parg->name);
|
|
|
|
if (parg->count) {
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "{%s",
|
|
|
|
parg->type->fmt);
|
|
|
|
for (j = 1; j < parg->count; j++)
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, ",%s",
|
|
|
|
parg->type->fmt);
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "}");
|
|
|
|
} else
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "%s",
|
|
|
|
parg->type->fmt);
|
2013-07-03 01:09:02 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
|
|
|
|
|
|
|
|
for (i = 0; i < tp->nr_args; i++) {
|
2018-04-25 06:21:55 -06:00
|
|
|
parg = tp->args + i;
|
|
|
|
if (parg->count) {
|
|
|
|
if (strcmp(parg->type->name, "string") == 0)
|
|
|
|
fmt = ", __get_str(%s[%d])";
|
|
|
|
else
|
|
|
|
fmt = ", REC->%s[%d]";
|
|
|
|
for (j = 0; j < parg->count; j++)
|
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO,
|
|
|
|
fmt, parg->name, j);
|
|
|
|
} else {
|
|
|
|
if (strcmp(parg->type->name, "string") == 0)
|
|
|
|
fmt = ", __get_str(%s)";
|
|
|
|
else
|
|
|
|
fmt = ", REC->%s";
|
2013-07-03 01:09:02 -06:00
|
|
|
pos += snprintf(buf + pos, LEN_OR_ZERO,
|
2018-04-25 06:21:55 -06:00
|
|
|
fmt, parg->name);
|
|
|
|
}
|
2013-07-03 01:09:02 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/* return the length of print_fmt */
|
|
|
|
return pos;
|
|
|
|
}
|
2018-04-25 06:21:55 -06:00
|
|
|
#undef LEN_OR_ZERO
|
2013-07-03 01:09:02 -06:00
|
|
|
|
2018-04-25 06:19:30 -06:00
|
|
|
int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return)
|
2013-07-03 01:09:02 -06:00
|
|
|
{
|
|
|
|
int len;
|
|
|
|
char *print_fmt;
|
|
|
|
|
|
|
|
/* First: called with 0 length to calculate the needed length */
|
|
|
|
len = __set_print_fmt(tp, NULL, 0, is_return);
|
|
|
|
print_fmt = kmalloc(len + 1, GFP_KERNEL);
|
|
|
|
if (!print_fmt)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
/* Second: actually write the @print_fmt */
|
|
|
|
__set_print_fmt(tp, print_fmt, len + 1, is_return);
|
|
|
|
tp->call.print_fmt = print_fmt;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2018-04-25 06:17:05 -06:00
|
|
|
|
|
|
|
int traceprobe_define_arg_fields(struct trace_event_call *event_call,
|
|
|
|
size_t offset, struct trace_probe *tp)
|
|
|
|
{
|
|
|
|
int ret, i;
|
|
|
|
|
|
|
|
/* Set argument names as fields */
|
|
|
|
for (i = 0; i < tp->nr_args; i++) {
|
|
|
|
struct probe_arg *parg = &tp->args[i];
|
2018-04-25 06:21:55 -06:00
|
|
|
const char *fmt = parg->type->fmttype;
|
|
|
|
int size = parg->type->size;
|
|
|
|
|
|
|
|
if (parg->fmt)
|
|
|
|
fmt = parg->fmt;
|
|
|
|
if (parg->count)
|
|
|
|
size *= parg->count;
|
|
|
|
ret = trace_define_field(event_call, fmt, parg->name,
|
|
|
|
offset + parg->offset, size,
|
2018-04-25 06:17:05 -06:00
|
|
|
parg->type->is_signed,
|
|
|
|
FILTER_OTHER);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|