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/*
Copyright (C) 2011 Jiri Olsa <olsajiri@gmail.com>
This file is part of the latrace.
The latrace is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The latrace 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 the latrace (file COPYING). If not, see
<http://www.gnu.org/licenses/>.
*/
#include <strings.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
static void *root = NULL;
extern struct lt_config_audit cfg;
static int compare(const void *a, const void *b)
{
const struct lt_symbol *sym_a = a;
const struct lt_symbol *sym_b = b;
PRINT_VERBOSE(&cfg, 1, "a %p, b %p\n", sym_a, sym_b);
PRINT_VERBOSE(&cfg, 1, "a ptr %p, b ptr %p\n",
sym_a ? sym_a->ptr : NULL,
sym_b ? sym_b->ptr : NULL);
PRINT_VERBOSE(&cfg, 1, "a name %s, b name %s\n",
sym_a ? sym_a->name : "",
sym_b ? sym_b->name: "");
if (!sym_a || !sym_b)
return 1;
/* XXX There's a glibc bug/feature causing the symbol to
* have different value in plt entry/exit.. so using name
* check instead.. so far.. ;) */
#define SEARCH_NAME
#undef SEARCH_PTR
#ifdef SEARCH_NAME
return strcmp(sym_a->name, sym_b->name);
#endif
#if SEARCH_PTR
PRINT_VERBOSE(&cfg, 1, "%s(%p) %s(%p)\n",
sym_a->name, sym_a->ptr,
sym_b->name, sym_b->ptr);
if (sym_a->ptr > sym_b->ptr)
return 1;
if (sym_a->ptr < sym_b->ptr)
return -1;
return 0;
#endif
}
static int symbol_init(struct lt_config_shared *cfg,
struct lt_symbol *sym, const char *name)
{
struct lt_args_sym* a = NULL;
if (lt_sh(cfg, args_enabled)) {
a = lt_args_sym_get(cfg, name);
if (!a)
return -1;
}
sym->args = a;
PRINT_VERBOSE(cfg, 1, "ok name %s, ptr %p, sym %p\n",
name, sym->ptr, sym);
return 0;
}
struct lt_symbol* lt_symbol_bind(struct lt_config_shared *cfg,
void *ptr, const char *name)
{
static struct lt_symbol *sym = NULL;
struct lt_symbol *s = NULL;
void *val;
PRINT_VERBOSE(cfg, 1, "checking %s(%p)\n", name, ptr);
/* symbol already added */
s = lt_symbol_get(cfg, ptr, name);
if (s) {
PRINT_VERBOSE(cfg, 1, "found %s, ptr %p, sym %p\n",
name, sym->ptr, sym);
return s;
}
if (!sym) {
sym = malloc(sizeof(*sym));
if (!sym)
return NULL;
}
bzero(sym, sizeof(*sym));
sym->ptr = ptr;
sym->name = name;
/* do we care about this symbol? */
if (symbol_init(cfg, sym, name))
return NULL;
/* we do, let's add it */
val = tsearch((void *) sym, &root, compare);
if (!val)
return NULL;
/* symbol properly added */
s = (*(void**) val);
PRINT_VERBOSE(cfg, 1, "added %s, ptr %p, sym %p\n",
name, sym->ptr, sym);
sym = NULL;
return s;
}
struct lt_symbol* lt_symbol_get(struct lt_config_shared *cfg,
void *ptr, const char *name)
{
void *val;
struct lt_symbol *s;
struct lt_symbol sym = {
.ptr = ptr,
.name = name,
};
val = tfind(&sym, &root, compare);
if (!val)
s = NULL;
else
s = *(struct lt_symbol**) val;
PRINT_VERBOSE(cfg, 1, "found %p '%s'\n", s, s ? s->name : "");
return s;
}
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