static void diagnose_load_failure ( void )
{
# define NBUF 1024
UChar buf[NBUF];
VG_(debugLog)(0, "initimg", "Diagnosing load failure\n");
if (sizeof(void*) == 8) {
VG_(debugLog)(0, "initimg", "Can't safely do loadquery() "
"in 64-bit mode. Sorry.\n");
/* because this requires dynamic linking to be working (IIRC)
and it isn't; the tool file's dynamic linking was never done,
because it was loaded by the bootstrap stub, which simply did
sys_kload() but didn't make usla do the relevant
relocations. */
} else {
UChar** p;
Int r = loadquery(L_GETMESSAGES, buf, NBUF);
VG_(debugLog)(0, "initimg", "loadquery returned %d (0 = success)\n", r);
p = (UChar**)(&buf[0]);
for (; *p; p++)
VG_(debugLog)(0, "initimg", "\"%s\"\n", *p);
VG_(debugLog)(0, "initimg", "Use /usr/sbin/execerror to make "
"sense of above string(s)\n");
VG_(debugLog)(0, "initimg", "See also comments at the bottom of\n");
VG_(debugLog)(0, "initimg", "coregrind/m_initimg/"
"initimg-aix5.c (in Valgrind sources)\n");
}
# undef NBUF
}
/*
* Find the main modules entry point. This is used as export pointer
* for loadbind() to be able to resolve references to the main part.
*/
static void *
findMain(void)
{
struct ld_info *lp;
char *buf;
int size = 4 * 1024;
int i;
void *ret;
if ((buf = malloc(size)) == NULL)
{
errvalid++;
strcpy(errbuf, "findMain: ");
strcat(errbuf, strerror(errno));
return NULL;
}
while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM)
{
free(buf);
size += 4 * 1024;
if ((buf = malloc(size)) == NULL)
{
errvalid++;
strcpy(errbuf, "findMain: ");
strcat(errbuf, strerror(errno));
return NULL;
}
}
if (i == -1)
{
errvalid++;
strcpy(errbuf, "findMain: ");
strcat(errbuf, strerror(errno));
free(buf);
return NULL;
}
/*
* The first entry is the main module. The entry point returned by load()
* does actually point to the data segment origin.
*/
lp = (struct ld_info *) buf;
ret = lp->ldinfo_dataorg;
free(buf);
return ret;
}
ACP_EXPORT acp_rc_t acpSymTableInit(acp_sym_table_t *aSymTable)
{
acp_sint32_t sRet;
sRet = loadquery(L_GETINFO,
aSymTable->mObjInfoBuffer,
(acp_uint32_t)sizeof(aSymTable->mObjInfoBuffer));
if (sRet != -1)
{
return ACP_RC_SUCCESS;
}
else
{
return ACP_RC_GET_OS_ERROR();
}
}
/*
* Find the main modules data origin. This is used as export pointer
* for loadbind() to be able to resolve references to the main part.
*/
static void *findMain(void)
{
struct ld_info *lp;
char *buf;
int size = 4 * 1024;
int i;
void *ret;
if ((buf = malloc(size)) == NULL) {
errvalid++;
strcpy(errbuf, "findMain: ");
strcat(errbuf, strerror(errno));
return NULL;
}
while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
free(buf);
size += 4 * 1024;
if ((buf = malloc(size)) == NULL) {
errvalid++;
strcpy(errbuf, "findMain: ");
strcat(errbuf, strerror(errno));
return NULL;
}
}
if (i == -1) {
errvalid++;
strcpy(errbuf, "findMain: ");
strcat(errbuf, strerror(errno));
free(buf);
return NULL;
}
/*
* The first entry is the main module. The data segment
* starts with the TOC entries for all exports, so the
* data segment origin works as argument for loadbind.
*/
lp = (struct ld_info *) buf;
ret = lp->ldinfo_dataorg;
free(buf);
return ret;
}
VOID *dlopen(const char *path, int mode)
{
register ModulePtr mp;
static void *mainModule;
/*
* Upon the first call register a terminate handler that will
* close all libraries. Also get a reference to the main module
* for use with loadbind.
*/
if (!mainModule) {
if ((mainModule = findMain()) == NULL)
return NULL;
atexit(terminate);
}
/*
* Scan the list of modules if we have the module already loaded.
*/
for (mp = modList; mp; mp = mp->next)
if (strcmp(mp->name, path) == 0) {
mp->refCnt++;
return (VOID *) mp;
}
if ((mp = (ModulePtr)calloc(1, sizeof(*mp))) == NULL) {
errvalid++;
strcpy(errbuf, "calloc: ");
strcat(errbuf, strerror(errno));
return (VOID *) NULL;
}
mp->name = malloc((unsigned) (strlen(path) + 1));
strcpy(mp->name, path);
/*
* load should be declared load(const char *...). Thus we
* cast the path to a normal char *. Ugly.
*/
if ((mp->entry = (void *)load((char *)path, L_NOAUTODEFER, NULL)) == NULL) {
free(mp->name);
free(mp);
errvalid++;
strcpy(errbuf, "dlopen: ");
strcat(errbuf, path);
strcat(errbuf, ": ");
/*
* If AIX says the file is not executable, the error
* can be further described by querying the loader about
* the last error.
*/
if (errno == ENOEXEC) {
char *tmp[BUFSIZ/sizeof(char *)];
if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
strcpy(errbuf, strerror(errno));
else {
char **p;
for (p = tmp; *p; p++)
caterr(*p);
}
} else
strcat(errbuf, strerror(errno));
return (VOID *) NULL;
}
mp->refCnt = 1;
mp->next = modList;
modList = mp;
if (loadbind(0, mainModule, mp->entry) == -1) {
dlclose(mp);
errvalid++;
strcpy(errbuf, "loadbind: ");
strcat(errbuf, strerror(errno));
return (VOID *) NULL;
}
/*
* If the user wants global binding, loadbind against all other
* loaded modules.
*/
if (mode & RTLD_GLOBAL) {
register ModulePtr mp1;
for (mp1 = mp->next; mp1; mp1 = mp1->next)
if (loadbind(0, mp1->entry, mp->entry) == -1) {
dlclose(mp);
errvalid++;
strcpy(errbuf, "loadbind: ");
strcat(errbuf, strerror(errno));
return (VOID *) NULL;
}
}
if (readExports(mp) == -1) {
dlclose(mp);
return (VOID *) NULL;
}
/*
* If there is a dl_info structure, call the init function.
*/
if (mp->info = (struct dl_info *)dlsym(mp, "dl_info")) {
if (mp->info->init)
(*mp->info->init)();
} else
errvalid = 0;
/*
* If the shared object was compiled using xlC we will need
* to call static constructors (and later on dlclose destructors).
*/
if (mp->cdtors = (CdtorPtr)dlsym(mp, "__cdtors")) {
while (mp->cdtors->init) {
(*mp->cdtors->init)();
mp->cdtors++;
}
} else
errvalid = 0;
return (VOID *) mp;
}
/*
* Build the export table from the XCOFF .loader section.
*/
static int readExports(ModulePtr mp)
{
LDFILE *ldp = NULL;
SCNHDR sh, shdata;
LDHDR *lhp;
char *ldbuf;
LDSYM *ls;
int i;
ExportPtr ep;
if ((ldp = ldopen(mp->name, ldp)) == NULL) {
struct ld_info *lp;
char *buf;
int size = 4*1024;
if (errno != ENOENT) {
errvalid++;
strcpy(errbuf, "readExports: ");
strcat(errbuf, strerror(errno));
return -1;
}
/*
* The module might be loaded due to the LIBPATH
* environment variable. Search for the loaded
* module using L_GETINFO.
*/
if ((buf = malloc(size)) == NULL) {
errvalid++;
strcpy(errbuf, "readExports: ");
strcat(errbuf, strerror(errno));
return -1;
}
while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
free(buf);
size += 4*1024;
if ((buf = malloc(size)) == NULL) {
errvalid++;
strcpy(errbuf, "readExports: ");
strcat(errbuf, strerror(errno));
return -1;
}
}
if (i == -1) {
errvalid++;
strcpy(errbuf, "readExports: ");
strcat(errbuf, strerror(errno));
free(buf);
return -1;
}
/*
* Traverse the list of loaded modules. The entry point
* returned by load() does actually point to the data
* segment origin.
*/
lp = (struct ld_info *)buf;
while (lp) {
if (lp->ldinfo_dataorg == mp->entry) {
ldp = ldopen(lp->ldinfo_filename, ldp);
break;
}
if (lp->ldinfo_next == 0)
lp = NULL;
else
lp = (struct ld_info *)((char *)lp + lp->ldinfo_next);
}
free(buf);
if (!ldp) {
errvalid++;
strcpy(errbuf, "readExports: ");
strcat(errbuf, strerror(errno));
return -1;
}
}
if (TYPE(ldp) != U802TOCMAGIC) {
errvalid++;
strcpy(errbuf, "readExports: bad magic");
while(ldclose(ldp) == FAILURE)
;
return -1;
}
/*
* Get the padding for the data section. This is needed for
* AIX 4.1 compilers. This is used when building the final
* function pointer to the exported symbol.
*/
if (ldnshread(ldp, _DATA, &shdata) != SUCCESS) {
errvalid++;
strcpy(errbuf, "readExports: cannot read data section header");
while(ldclose(ldp) == FAILURE)
;
return -1;
}
if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
errvalid++;
strcpy(errbuf, "readExports: cannot read loader section header");
while(ldclose(ldp) == FAILURE)
;
return -1;
}
/*
* We read the complete loader section in one chunk, this makes
* finding long symbol names residing in the string table easier.
*/
if ((ldbuf = (char *)malloc(sh.s_size)) == NULL) {
errvalid++;
strcpy(errbuf, "readExports: ");
strcat(errbuf, strerror(errno));
while(ldclose(ldp) == FAILURE)
;
return -1;
}
if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
errvalid++;
strcpy(errbuf, "readExports: cannot seek to loader section");
free(ldbuf);
while(ldclose(ldp) == FAILURE)
;
return -1;
}
if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
errvalid++;
strcpy(errbuf, "readExports: cannot read loader section");
free(ldbuf);
while(ldclose(ldp) == FAILURE)
;
return -1;
}
lhp = (LDHDR *)ldbuf;
ls = (LDSYM *)(ldbuf+LDHDRSZ);
/*
* Count the number of exports to include in our export table.
*/
for (i = lhp->l_nsyms; i; i--, ls++) {
if (!LDR_EXPORT(*ls))
continue;
mp->nExports++;
}
if ((mp->exports = (ExportPtr)calloc(mp->nExports, sizeof(*mp->exports))) == NULL) {
errvalid++;
strcpy(errbuf, "readExports: ");
strcat(errbuf, strerror(errno));
free(ldbuf);
while(ldclose(ldp) == FAILURE)
;
return -1;
}
/*
* Fill in the export table. All entries are relative to
* the entry point we got from load.
*/
ep = mp->exports;
ls = (LDSYM *)(ldbuf+LDHDRSZ);
for (i = lhp->l_nsyms; i; i--, ls++) {
char *symname;
char tmpsym[SYMNMLEN+1];
if (!LDR_EXPORT(*ls))
continue;
if (ls->l_zeroes == 0)
symname = ls->l_offset+lhp->l_stoff+ldbuf;
else {
/*
* The l_name member is not zero terminated, we
* must copy the first SYMNMLEN chars and make
* sure we have a zero byte at the end.
*/
strncpy(tmpsym, ls->l_name, SYMNMLEN);
tmpsym[SYMNMLEN] = '\0';
symname = tmpsym;
}
ep->name = malloc((unsigned) (strlen(symname) + 1));
strcpy(ep->name, symname);
ep->addr = (void *)((unsigned long)mp->entry +
ls->l_value - shdata.s_vaddr);
ep++;
}
free(ldbuf);
while(ldclose(ldp) == FAILURE)
;
return 0;
}
int pgin_all(my_region_t *Caller_Supplied_Regions, int lock_in_memory)
{
pid_t mypid=getpid();
/* For data (heap) section */
void *my_edata;
/* For Loader / Shared lib section */
struct ld_xinfo *p_ld_xinfo;
char *ar;
char ldbuf[LOADQUERY_BUFFER];
/* For stats */
uint64_t pg_cnt;
struct procentry64 p[6];
/* Initial stats checkpoint */
stats_checkpoint_initial(&p[0]);
/*****************************
* FAST PAGE-IN DIRECTIVE *
*****************************
*/
if (lock_in_memory)
{
/* Shortcut ! */
if (mlockall(MCL_CURRENT|MCL_FUTURE) >= 0)
{
/* Great. mlockall forces the page-ins across the address space. Page-outs will be resisted. OK for a small memory size.
* For a large memory size relative to the host system, don't lock... use lock_in_memory=0. */
printf ("MLOCKALL\n");
stats_checkpoint(mypid, pg_cnt, &p[0], &p[1]);
return 0;
}
else
fprintf(stderr,"Page locking in memory was requested. mlockall returned %s, error code %d. Continuing...\n",strerror(errno),errno);
/* Fall through into the soft handler */
}
/*****************************
* MANUAL PAGE-IN ALGORITHM *
*****************************
*/
/* Text region */
/* The Loader section will also cover text */
printf ("TEXT: pg_ref(_text=0x%p, _etext=0x%p, %d, %d)\n", &_text, &_etext, 0, PAGE_TOUCH_RDONLY);
pg_cnt=pg_ref(&_text, &_etext, 0, PAGE_TOUCH_RDONLY);
stats_checkpoint(mypid, pg_cnt, &p[0], &p[1]);
/* Data region */
my_edata=sbrk(0);
printf ("DATA: pg_ref(_data=0x%p, _edata=0x%p, %d, %d)\n", &_data, my_edata, 0, PAGE_TOUCH_RDONLY);
pg_ref(&_data, my_edata, 0, PAGE_TOUCH_RDONLY); /* Multi-threaded: read-only- not thread-safe */
/*pg_cnt=pg_ref(&_data, my_edata, 0, PAGE_TOUCH_RDWR);*/ /* Single-threaded: read-write */
stats_checkpoint(mypid, pg_cnt, &p[1], &p[2]);
/* Loader / Shared Library text & data regions */
if ((loadquery(L_GETXINFO, (void*)ldbuf, sizeof(ldbuf)))<0)
{
if (errno==ENOMEM)
fprintf(stderr,"loadquery returned %s, error code %d. Increase the static buffers or recode to make it dynamic.\n",strerror(errno),errno);
else
fprintf(stderr,"loadquery returned %s, error code %d.\n",strerror(errno),errno);
return EXIT_FAILURE;
}
for (p_ld_xinfo=(struct ld_xinfo*) ldbuf; p_ld_xinfo; p_ld_xinfo = (p_ld_xinfo->ldinfo_next ? (void*)p_ld_xinfo + p_ld_xinfo->ldinfo_next : NULL))
{
ar = (char*)p_ld_xinfo + p_ld_xinfo->ldinfo_filename;
printf ("%s: file=\"%s\" member=\"%s\" text=0x%015" PRIX64 " text_len=0x%016" PRIX64 ", data=0x%015" PRIX64 " data_len=0x%016" PRIX64 ", tdata=0x%015" PRIX64 " tdata_len=0x%016" PRIX64 ", tbss_len=0x%016" PRIX64 "\n",
"LOAD+SHLIB",
ar,
ar + strlen(ar) + 1,
(ptr64_t)p_ld_xinfo->ldinfo_textorg,
(uint64_t)p_ld_xinfo->ldinfo_textsize,
(ptr64_t)p_ld_xinfo->ldinfo_dataorg,
(uint64_t)p_ld_xinfo->ldinfo_datasize,
(ptr64_t)p_ld_xinfo->ldinfo_tdataorg,
(uint64_t)p_ld_xinfo->ldinfo_tdatasize,
(uint64_t)p_ld_xinfo->ldinfo_tbsssize);
printf ("text\n");
pg_cnt=pg_ref((void*)(p_ld_xinfo->ldinfo_textorg), (void*)(p_ld_xinfo->ldinfo_textorg) + p_ld_xinfo->ldinfo_textsize, 0, PAGE_TOUCH_RDONLY);
stats_checkpoint(mypid, pg_cnt, &p[2], &p[3]);
printf ("data\n");
pg_cnt=pg_ref((void*)(p_ld_xinfo->ldinfo_dataorg), (void*)(p_ld_xinfo->ldinfo_dataorg) + p_ld_xinfo->ldinfo_datasize, 0, PAGE_TOUCH_RDONLY);
stats_checkpoint(mypid, pg_cnt, &p[3], &p[4]);
memcpy(&p[2],&p[4],sizeof(p[2])); /* Reinit p[2] for next loop */
}
/* Stack */
/* Skipping this - low quantity / low value */
;
/* Caller Supplied Regions
* Includes shared memory, i.e. shmget/shmat and mmap
* There is no C API method to derive shared memory mappings using
* public interfaces, up to the time of writing, July 2014 / AIX 7.1 TL3.
* svmon -P <pid> & procmap -S <pid> derive this using the
* private, undocumented kernel performance extensions, specifically
* getvsidsandprocl_pid() and ptx_getsegstat().
* Until IBM supplies a public API or guidance on the private interfaces
* these cannot be derived. No consideration is given to calling out
* externally to svmon, because this call is way too slow.
*
* In the meantime, the caller can identify the shared segments to map.
*/
if (Caller_Supplied_Regions)
{
int i;
for (i=0; Caller_Supplied_Regions[i].addr; i++)
{
printf("CALLER SUPPLIED REGION #%d: 0x%p - 0x%p\n", i, (void*)(Caller_Supplied_Regions[i].addr), (void*)(Caller_Supplied_Regions[i].addr) + Caller_Supplied_Regions[i].size);
pg_cnt=pg_ref((void*)(Caller_Supplied_Regions[i].addr), (void*)(Caller_Supplied_Regions[i].addr) + Caller_Supplied_Regions[i].size, 0, PAGE_TOUCH_RDONLY);
stats_checkpoint(mypid, pg_cnt, &p[4], &p[5]);
memcpy(&p[4],&p[5],sizeof(p[4])); /* Reinit p[4] for next loop */
}
}
}
static int fill_dll_info(void) {
return loadquery(L_GETINFO, dladdr_buffer, sizeof(dladdr_buffer));
}
/* ARGSUSED */
void *dlopen(const char *path, int mode)
{
register ModulePtr mp;
static void *mainModule;
/*
* Upon the first call register a terminate handler that will
* close all libraries. Also get a reference to the main module
* for use with loadbind.
*/
if (!mainModule) {
if ((mainModule = findMain()) == NULL)
return NULL;
atexit(terminate);
}
/*
* Scan the list of modules if have the module already loaded.
*/
for (mp = modList; mp; mp = mp->next)
if (strcmp(mp->name, path) == 0) {
mp->refCnt++;
return mp;
}
if ((mp = (ModulePtr)calloc(1, sizeof(*mp))) == NULL) {
errvalid++;
strcpy(errbuf, "calloc: ");
strcat(errbuf, strerror(errno));
return NULL;
}
if ((mp->name = strdup(path)) == NULL) {
errvalid++;
strcpy(errbuf, "strdup: ");
strcat(errbuf, strerror(errno));
free(mp);
return NULL;
}
/*
* load should be declared load(const char *...). Thus we
* cast the path to a normal char *. Ugly.
*/
if ((mp->entry = (void *)load((char *)path, L_NOAUTODEFER, NULL)) == NULL) {
free(mp->name);
free(mp);
errvalid++;
strcpy(errbuf, "dlopen: ");
strcat(errbuf, path);
strcat(errbuf, ": ");
/*
* If AIX says the file is not executable, the error
* can be further described by querying the loader about
* the last error.
*/
if (errno == ENOEXEC) {
char *tmp[BUFSIZ/sizeof(char *)];
if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
strcpy(errbuf, strerror(errno));
else {
char **p;
for (p = tmp; *p; p++)
caterr(*p);
}
} else
strcat(errbuf, strerror(errno));
return NULL;
}
mp->refCnt = 1;
mp->next = modList;
modList = mp;
if (loadbind(0, mainModule, mp->entry) == -1) {
dlclose(mp);
errvalid++;
strcpy(errbuf, "loadbind: ");
strcat(errbuf, strerror(errno));
return NULL;
}
if (readExports(mp) == -1) {
dlclose(mp);
return NULL;
}
/*
* If there is a dl_info structure, call the init function.
*/
if (mp->info = (struct dl_info *)dlsym(mp, "dl_info")) {
if (mp->info->init)
(*mp->info->init)();
} else
errvalid = 0;
return mp;
}
// Rebuild the internal module table. If an error occurs, old table remains
// unchanged.
static bool reload_table() {
bool rc = false;
trcVerbose("reload module table...");
entry_t* new_list = NULL;
const struct ld_info* ldi = NULL;
// Call loadquery(L_GETINFO..) to get a list of all loaded Dlls from AIX. loadquery
// requires a large enough buffer.
uint8_t* buffer = NULL;
size_t buflen = 1024;
for (;;) {
buffer = (uint8_t*) ::realloc(buffer, buflen);
if (loadquery(L_GETINFO, buffer, buflen) == -1) {
if (errno == ENOMEM) {
buflen *= 2;
} else {
trcVerbose("loadquery failed (%d)", errno);
goto cleanup;
}
} else {
break;
}
}
trcVerbose("loadquery buffer size is %llu.", buflen);
// Iterate over the loadquery result. For details see sys/ldr.h on AIX.
ldi = (struct ld_info*) buffer;
for (;;) {
entry_t* e = (entry_t*) ::malloc(sizeof(entry_t));
if (!e) {
trcVerbose("OOM.");
goto cleanup;
}
memset(e, 0, sizeof(entry_t));
e->info.text = ldi->ldinfo_textorg;
e->info.text_len = ldi->ldinfo_textsize;
e->info.data = ldi->ldinfo_dataorg;
e->info.data_len = ldi->ldinfo_datasize;
e->info.path = g_stringlist.add(ldi->ldinfo_filename);
if (!e->info.path) {
trcVerbose("OOM.");
goto cleanup;
}
// Extract short name
{
const char* p = strrchr(e->info.path, '/');
if (p) {
p ++;
e->info.shortname = p;
} else {
e->info.shortname = e->info.path;
}
}
// Do we have a member name as well (see ldr.h)?
const char* p_mbr_name =
ldi->ldinfo_filename + strlen(ldi->ldinfo_filename) + 1;
if (*p_mbr_name) {
e->info.member = g_stringlist.add(p_mbr_name);
if (!e->info.member) {
trcVerbose("OOM.");
goto cleanup;
}
} else {
e->info.member = NULL;
}
if (strcmp(e->info.shortname, "libjvm.so") == 0) {
// Note that this, theoretically, is fuzzy. We may accidentally contain
// more than one libjvm.so. But that is improbable, so lets go with this
// solution.
e->info.is_in_vm = true;
}
trcVerbose("entry: %p %llu, %p %llu, %s %s %s, %d",
e->info.text, e->info.text_len,
e->info.data, e->info.data_len,
e->info.path, e->info.shortname,
(e->info.member ? e->info.member : "NULL"),
e->info.is_in_vm
);
// Add to list.
add_entry_to_list(e, &new_list);
// Next entry...
if (ldi->ldinfo_next) {
ldi = (struct ld_info*)(((char*)ldi) + ldi->ldinfo_next);
} else {
break;
}
}
// We are done. All is well. Free old list and swap to new one.
if (g_first) {
free_entry_list(&g_first);
}
g_first = new_list;
new_list = NULL;
rc = true;
cleanup:
if (new_list) {
free_entry_list(&new_list);
}
::free(buffer);
return rc;
} // end LoadedLibraries::reload()