static void
module_unload_event(void *drcontext, const module_data_t *mod)
{
if (strstr(dr_module_preferred_name(mod),
"client.drwrap-test.appdll.") != NULL) {
bool ok;
ok = drwrap_replace(addr_replace, NULL, true);
CHECK(ok, "un-replace failed");
ok = drwrap_replace_native(addr_replace2, NULL, true, 0, NULL, true);
CHECK(ok, "un-replace_native failed");
ok = drwrap_replace_native(addr_replace_callsite, NULL, false, 0, NULL, true);
CHECK(ok, "un-replace_native failed");
unwrap_addr(addr_skip_flags, "skip_flags", mod, true, false);
unwrap_addr(addr_level0, "level0", mod, true, true);
unwrap_addr(addr_level1, "level1", mod, true, true);
unwrap_addr(addr_level2, "level2", mod, true, true);
unwrap_addr(addr_tailcall, "makes_tailcall", mod, true, true);
unwrap_addr(addr_preonly, "preonly", mod, true, false);
/* skipme, postonly, and runlots were already unwrapped */
/* test longjmp */
unwrap_unwindtest_addr(addr_long0, "long0", mod);
unwrap_unwindtest_addr(addr_long1, "long1", mod);
unwrap_unwindtest_addr(addr_long2, "long2", mod);
unwrap_unwindtest_addr(addr_long3, "long3", mod);
unwrap_unwindtest_addr(addr_longdone, "longdone", mod);
drmgr_set_tls_field(drcontext, tls_idx, (void *)(ptr_uint_t)0);
#ifdef WINDOWS
/* test SEH */
if (load_count == 1) {
ok = drwrap_unwrap(addr_long0, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post);
CHECK(ok, "unwrap failed");
ok = drwrap_unwrap(addr_long1, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post);
CHECK(ok, "unwrap failed");
ok = drwrap_unwrap(addr_long2, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post);
CHECK(ok, "unwrap failed");
ok = drwrap_unwrap(addr_long3, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post);
CHECK(ok, "unwrap failed");
ok = drwrap_unwrap(addr_longdone, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post);
}
CHECK(ok, "unwrap failed");
#endif
}
}
void
replace_init(void)
{
if (options.replace_libc) {
app_pc addr;
int i;
char *s;
/* replace_module_load will be called for each module to populate the hashtable */
ASSERT(PAGE_START(get_function_entry((app_pc)replace_memset)) ==
PAGE_START(get_function_entry((app_pc)replace_memmove)),
"replace_ routines taking up more than one page");
ASSERT(sizeof(int) >= sizeof(wchar_t),
"wchar_t replacement functions assume wchar_t is not larger than int");
replace_routine_start = (app_pc)
PAGE_START(get_function_entry((app_pc)replace_memset));
/* PR 485412: we support passing in addresses of libc routines to
* be replaced if statically included in the executable and if
* we have no symbols available
*/
s = options.libc_addrs;
i = 0;
while (s != NULL) {
if (sscanf(s, PIFX, (ptr_uint_t *)&addr) == 1 ||
/* we save option space by having no 0x prefix but assuming hex */
sscanf(s, PIFMT, (ptr_uint_t *)&addr) == 1) {
LOG(2, "replacing %s @"PFX" in executable from options\n",
replace_routine_name[i], addr);
if (!drwrap_replace((app_pc)addr, (app_pc)replace_routine_addr[i], false))
ASSERT(false, "failed to replace");
}
s = strchr(s, ',');
if (s != NULL)
s++;
i++;
}
#ifdef USE_DRSYMS
hashtable_init(&replace_name_table, REPLACE_NAME_TABLE_HASH_BITS, HASH_STRING,
false/*!strdup*/);
for (i=0; i<REPLACE_NUM; i++) {
hashtable_add(&replace_name_table, (void *) replace_routine_name[i],
(void *)(ptr_int_t)(i+1)/*since 0 is "not found"*/);
}
#endif
}
}
static void
module_load_event(void *drcontext, const module_data_t *mod, bool loaded)
{
if (strstr(dr_module_preferred_name(mod),
"client.drwrap-test.appdll.") != NULL) {
bool ok;
instr_t inst;
app_pc init_pc, pc, next_pc;
load_count++;
if (load_count == 2) {
/* test no-frills */
drwrap_set_global_flags(DRWRAP_NO_FRILLS);
}
addr_replace = (app_pc) dr_get_proc_address(mod->handle, "replaceme");
CHECK(addr_replace != NULL, "cannot find lib export");
ok = drwrap_replace(addr_replace, (app_pc) replacewith, false);
CHECK(ok, "replace failed");
addr_replace2 = (app_pc) dr_get_proc_address(mod->handle, "replaceme2");
CHECK(addr_replace2 != NULL, "cannot find lib export");
ok = drwrap_replace_native(addr_replace2, (app_pc) replacewith2, true/*at entry*/,
0, (void *)(ptr_int_t)DRWRAP_NATIVE_PARAM, false);
CHECK(ok, "replace_native failed");
init_pc = (app_pc) dr_get_proc_address(mod->handle, "replace_callsite");
CHECK(init_pc != NULL, "cannot find lib export");
/* Find callsite: we assume we'll linearly hit a ret. We take final call
* to skip any PIC call.
*/
instr_init(drcontext, &inst);
pc = init_pc;
do {
instr_reset(drcontext, &inst);
next_pc = decode(drcontext, pc, &inst);
if (!instr_valid(&inst))
break;
/* if initial jmp, follow it to handle ILT-indirection */
if (pc == init_pc && instr_is_ubr(&inst))
next_pc = opnd_get_pc(instr_get_target(&inst));
else if (instr_is_call(&inst))
addr_replace_callsite = pc;
pc = next_pc;
} while (instr_valid(&inst) && !instr_is_return(&inst));
CHECK(addr_replace_callsite != NULL, "cannot find lib export");
ok = drwrap_replace_native(addr_replace_callsite, (app_pc) replace_callsite,
false/*!at entry*/, 0,
(void *)(ptr_int_t)DRWRAP_NATIVE_PARAM, false);
CHECK(ok, "replace_native failed");
instr_free(drcontext, &inst);
wrap_addr(&addr_level0, "level0", mod, true, true);
wrap_addr(&addr_level1, "level1", mod, true, true);
wrap_addr(&addr_level2, "level2", mod, true, true);
wrap_addr(&addr_tailcall, "makes_tailcall", mod, true, true);
wrap_addr(&addr_skipme, "skipme", mod, true, true);
wrap_addr(&addr_repeat, "repeatme", mod, true, true);
wrap_addr(&addr_preonly, "preonly", mod, true, false);
wrap_addr(&addr_postonly, "postonly", mod, false, true);
wrap_addr(&addr_runlots, "runlots", mod, false, true);
/* test longjmp */
wrap_unwindtest_addr(&addr_long0, "long0", mod);
wrap_unwindtest_addr(&addr_long1, "long1", mod);
wrap_unwindtest_addr(&addr_long2, "long2", mod);
wrap_unwindtest_addr(&addr_long3, "long3", mod);
wrap_unwindtest_addr(&addr_longdone, "longdone", mod);
drmgr_set_tls_field(drcontext, tls_idx, (void *)(ptr_uint_t)0);
#ifdef WINDOWS
/* test SEH */
/* we can't do this test for no-frills b/c only one wrap per addr */
if (load_count == 1) {
ok = drwrap_wrap_ex(addr_long0, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post,
NULL, DRWRAP_UNWIND_ON_EXCEPTION);
CHECK(ok, "wrap failed");
ok = drwrap_wrap_ex(addr_long1, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post,
NULL, DRWRAP_UNWIND_ON_EXCEPTION);
CHECK(ok, "wrap failed");
ok = drwrap_wrap_ex(addr_long2, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post,
NULL, DRWRAP_UNWIND_ON_EXCEPTION);
CHECK(ok, "wrap failed");
ok = drwrap_wrap_ex(addr_long3, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post,
NULL, DRWRAP_UNWIND_ON_EXCEPTION);
CHECK(ok, "wrap failed");
ok = drwrap_wrap_ex(addr_longdone, wrap_unwindtest_seh_pre,
wrap_unwindtest_seh_post,
NULL, DRWRAP_UNWIND_ON_EXCEPTION);
CHECK(ok, "wrap failed");
}
#endif
/* test leaner wrapping */
if (load_count == 2)
drwrap_set_global_flags(DRWRAP_NO_FRILLS | DRWRAP_FAST_CLEANCALLS);
wrap_addr(&addr_skip_flags, "skip_flags", mod, true, false);
}
}