Import Tcl-core 8.6.6 (as of svn r86089)
This commit is contained in:
Zachary Ware
630
unix/tclLoadAix.c
Normal file
630
unix/tclLoadAix.c
Normal file
@@ -0,0 +1,630 @@
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/*
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* tclLoadAix.c --
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*
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* This file implements the dlopen and dlsym APIs under the AIX operating
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* system, to enable the Tcl "load" command to work. This code was
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* provided by Jens-Uwe Mager.
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*
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* This file is subject to the following copyright notice, which is
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* different from the notice used elsewhere in Tcl. The file has been
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* modified to incorporate the file dlfcn.h in-line.
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*
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* Copyright (c) 1992,1993,1995,1996, Jens-Uwe Mager, Helios Software GmbH
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* Not derived from licensed software.
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*
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* Permission is granted to freely use, copy, modify, and redistribute
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* this software, provided that the author is not construed to be liable
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* for any results of using the software, alterations are clearly marked
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* as such, and this notice is not modified.
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*
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* Note: this file has been altered from the original in a few ways in order
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* to work properly with Tcl.
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*/
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/*
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* @(#)dlfcn.c 1.7 revision of 95/08/14 19:08:38
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* This is an unpublished work copyright (c) 1992 HELIOS Software GmbH
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* 30159 Hannover, Germany
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/ldr.h>
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#include <a.out.h>
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#include <ldfcn.h>
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#include "../compat/dlfcn.h"
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/*
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* We simulate dlopen() et al. through a call to load. Because AIX has no call
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* to find an exported symbol we read the loader section of the loaded module
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* and build a list of exported symbols and their virtual address.
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*/
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typedef struct {
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char *name; /* The symbols's name. */
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void *addr; /* Its relocated virtual address. */
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} Export, *ExportPtr;
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/*
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* xlC uses the following structure to list its constructors and destructors.
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* This is gleaned from the output of munch.
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*/
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typedef struct {
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void (*init)(void); /* call static constructors */
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void (*term)(void); /* call static destructors */
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} Cdtor, *CdtorPtr;
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/*
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* The void * handle returned from dlopen is actually a ModulePtr.
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*/
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typedef struct Module {
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struct Module *next;
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char *name; /* module name for refcounting */
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int refCnt; /* the number of references */
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void *entry; /* entry point from load */
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struct dl_info *info; /* optional init/terminate functions */
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CdtorPtr cdtors; /* optional C++ constructors */
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int nExports; /* the number of exports found */
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ExportPtr exports; /* the array of exports */
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} Module, *ModulePtr;
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/*
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* We keep a list of all loaded modules to be able to call the fini handlers
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* and destructors at atexit() time.
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*/
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static ModulePtr modList;
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/*
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* The last error from one of the dl* routines is kept in static variables
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* here. Each error is returned only once to the caller.
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*/
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static char errbuf[BUFSIZ];
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static int errvalid;
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static void caterr(char *);
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static int readExports(ModulePtr);
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static void terminate(void);
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static void *findMain(void);
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void *
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dlopen(
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const char *path,
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int mode)
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{
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register ModulePtr mp;
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static void *mainModule;
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/*
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* Upon the first call register a terminate handler that will close all
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* libraries. Also get a reference to the main module for use with
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* loadbind.
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*/
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if (!mainModule) {
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mainModule = findMain();
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if (mainModule == NULL) {
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return NULL;
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}
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atexit(terminate);
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}
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/*
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* Scan the list of modules if we have the module already loaded.
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*/
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for (mp = modList; mp; mp = mp->next) {
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if (strcmp(mp->name, path) == 0) {
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mp->refCnt++;
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return (void *) mp;
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}
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}
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mp = (ModulePtr) calloc(1, sizeof(*mp));
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if (mp == NULL) {
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errvalid++;
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strcpy(errbuf, "calloc: ");
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strcat(errbuf, strerror(errno));
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return NULL;
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}
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mp->name = malloc((unsigned) (strlen(path) + 1));
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strcpy(mp->name, path);
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/*
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* load should be declared load(const char *...). Thus we cast the path to
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* a normal char *. Ugly.
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*/
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mp->entry = (void *) load((char *)path, L_NOAUTODEFER, NULL);
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if (mp->entry == NULL) {
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free(mp->name);
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free(mp);
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errvalid++;
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strcpy(errbuf, "dlopen: ");
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strcat(errbuf, path);
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strcat(errbuf, ": ");
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/*
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* If AIX says the file is not executable, the error can be further
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* described by querying the loader about the last error.
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*/
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if (errno == ENOEXEC) {
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char *tmp[BUFSIZ/sizeof(char *)], **p;
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if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1) {
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strcpy(errbuf, strerror(errno));
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} else {
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for (p=tmp ; *p ; p++) {
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caterr(*p);
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}
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}
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} else {
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strcat(errbuf, strerror(errno));
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}
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return NULL;
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}
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mp->refCnt = 1;
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mp->next = modList;
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modList = mp;
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if (loadbind(0, mainModule, mp->entry) == -1) {
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loadbindFailure:
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dlclose(mp);
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errvalid++;
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strcpy(errbuf, "loadbind: ");
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strcat(errbuf, strerror(errno));
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return NULL;
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}
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/*
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* If the user wants global binding, loadbind against all other loaded
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* modules.
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*/
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if (mode & RTLD_GLOBAL) {
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register ModulePtr mp1;
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for (mp1 = mp->next; mp1; mp1 = mp1->next) {
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if (loadbind(0, mp1->entry, mp->entry) == -1) {
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goto loadbindFailure;
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}
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}
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}
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if (readExports(mp) == -1) {
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dlclose(mp);
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return NULL;
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}
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/*
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* If there is a dl_info structure, call the init function.
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*/
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if (mp->info = (struct dl_info *)dlsym(mp, "dl_info")) {
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if (mp->info->init) {
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mp->info->init();
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}
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} else {
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errvalid = 0;
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}
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/*
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* If the shared object was compiled using xlC we will need to call static
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* constructors (and later on dlclose destructors).
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*/
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if (mp->cdtors = (CdtorPtr) dlsym(mp, "__cdtors")) {
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while (mp->cdtors->init) {
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mp->cdtors->init();
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mp->cdtors++;
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}
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} else {
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errvalid = 0;
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}
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return (void *) mp;
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}
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/*
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* Attempt to decipher an AIX loader error message and append it to our static
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* error message buffer.
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*/
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static void
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caterr(
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char *s)
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{
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register char *p = s;
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while (*p >= '0' && *p <= '9') {
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p++;
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}
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switch (atoi(s)) { /* INTL: "C", UTF safe. */
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case L_ERROR_TOOMANY:
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strcat(errbuf, "to many errors");
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break;
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case L_ERROR_NOLIB:
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strcat(errbuf, "can't load library");
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strcat(errbuf, p);
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break;
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case L_ERROR_UNDEF:
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strcat(errbuf, "can't find symbol");
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strcat(errbuf, p);
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break;
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case L_ERROR_RLDBAD:
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strcat(errbuf, "bad RLD");
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strcat(errbuf, p);
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break;
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case L_ERROR_FORMAT:
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strcat(errbuf, "bad exec format in");
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strcat(errbuf, p);
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break;
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case L_ERROR_ERRNO:
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strcat(errbuf, strerror(atoi(++p))); /* INTL: "C", UTF safe. */
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break;
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default:
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strcat(errbuf, s);
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break;
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}
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}
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void *
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dlsym(
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void *handle,
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const char *symbol)
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{
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register ModulePtr mp = (ModulePtr)handle;
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register ExportPtr ep;
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register int i;
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/*
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* Could speed up the search, but I assume that one assigns the result to
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* function pointers anyways.
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*/
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for (ep = mp->exports, i = mp->nExports; i; i--, ep++) {
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if (strcmp(ep->name, symbol) == 0) {
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return ep->addr;
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}
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}
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errvalid++;
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strcpy(errbuf, "dlsym: undefined symbol ");
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strcat(errbuf, symbol);
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return NULL;
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}
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char *
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dlerror(void)
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{
|
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if (errvalid) {
|
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errvalid = 0;
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return errbuf;
|
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}
|
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return NULL;
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}
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int
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dlclose(
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void *handle)
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{
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||||
register ModulePtr mp = (ModulePtr)handle;
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int result;
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||||
register ModulePtr mp1;
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||||
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||||
if (--mp->refCnt > 0) {
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||||
return 0;
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||||
}
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||||
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||||
if (mp->info && mp->info->fini) {
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||||
mp->info->fini();
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}
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||||
if (mp->cdtors) {
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||||
while (mp->cdtors->term) {
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||||
mp->cdtors->term();
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||||
mp->cdtors++;
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||||
}
|
||||
}
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||||
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||||
result = unload(mp->entry);
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||||
if (result == -1) {
|
||||
errvalid++;
|
||||
strcpy(errbuf, strerror(errno));
|
||||
}
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||||
|
||||
if (mp->exports) {
|
||||
register ExportPtr ep;
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||||
register int i;
|
||||
for (ep = mp->exports, i = mp->nExports; i; i--, ep++) {
|
||||
if (ep->name) {
|
||||
free(ep->name);
|
||||
}
|
||||
}
|
||||
free(mp->exports);
|
||||
}
|
||||
|
||||
if (mp == modList) {
|
||||
modList = mp->next;
|
||||
} else {
|
||||
for (mp1 = modList; mp1; mp1 = mp1->next) {
|
||||
if (mp1->next == mp) {
|
||||
mp1->next = mp->next;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
free(mp->name);
|
||||
free(mp);
|
||||
return result;
|
||||
}
|
||||
|
||||
static void
|
||||
terminate(void)
|
||||
{
|
||||
while (modList) {
|
||||
dlclose(modList);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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;
|
||||
const char *errMsg;
|
||||
|
||||
#define Error(msg) do{errMsg=(msg);goto error;}while(0)
|
||||
#define SysErr() Error(strerror(errno))
|
||||
|
||||
ldp = ldopen(mp->name, ldp);
|
||||
if (ldp == NULL) {
|
||||
struct ld_info *lp;
|
||||
char *buf;
|
||||
int size = 0;
|
||||
|
||||
if (errno != ENOENT) {
|
||||
SysErr();
|
||||
}
|
||||
|
||||
/*
|
||||
* The module might be loaded due to the LIBPATH environment variable.
|
||||
* Search for the loaded module using L_GETINFO.
|
||||
*/
|
||||
|
||||
while (1) {
|
||||
size += 4 * 1024;
|
||||
buf = malloc(size);
|
||||
if (buf == NULL) {
|
||||
SysErr();
|
||||
}
|
||||
|
||||
i = loadquery(L_GETINFO, buf, size);
|
||||
|
||||
if (i != -1) {
|
||||
break;
|
||||
}
|
||||
free(buf);
|
||||
if (errno != ENOMEM) {
|
||||
SysErr();
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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) {
|
||||
SysErr();
|
||||
}
|
||||
}
|
||||
|
||||
if (TYPE(ldp) != U802TOCMAGIC) {
|
||||
Error("bad magic");
|
||||
}
|
||||
|
||||
/*
|
||||
* 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) {
|
||||
Error("cannot read data section header");
|
||||
}
|
||||
|
||||
if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
|
||||
Error("cannot read loader section header");
|
||||
}
|
||||
|
||||
/*
|
||||
* We read the complete loader section in one chunk, this makes finding
|
||||
* long symbol names residing in the string table easier.
|
||||
*/
|
||||
|
||||
ldbuf = (char *) malloc(sh.s_size);
|
||||
if (ldbuf == NULL) {
|
||||
SysErr();
|
||||
}
|
||||
|
||||
if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
|
||||
free(ldbuf);
|
||||
Error("cannot seek to loader section");
|
||||
}
|
||||
|
||||
if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
|
||||
free(ldbuf);
|
||||
Error("cannot read loader section");
|
||||
}
|
||||
|
||||
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++;
|
||||
}
|
||||
|
||||
mp->exports = (ExportPtr) calloc(mp->nExports, sizeof(*mp->exports));
|
||||
if (mp->exports == NULL) {
|
||||
free(ldbuf);
|
||||
SysErr();
|
||||
}
|
||||
|
||||
/*
|
||||
* 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!=0 ; 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) {
|
||||
/* Empty body */
|
||||
}
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* This is a factoring out of the error-handling code to make the rest of
|
||||
* the function much simpler to read.
|
||||
*/
|
||||
|
||||
error:
|
||||
errvalid++;
|
||||
strcpy(errbuf, "readExports: ");
|
||||
strcat(errbuf, errMsg);
|
||||
|
||||
if (ldp != NULL) {
|
||||
while (ldclose(ldp) == FAILURE) {
|
||||
/* Empty body */
|
||||
}
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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;
|
||||
|
||||
buf = malloc(size);
|
||||
if (buf == NULL) {
|
||||
goto error;
|
||||
}
|
||||
|
||||
while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
|
||||
free(buf);
|
||||
size += 4*1024;
|
||||
buf = malloc(size);
|
||||
if (buf == NULL) {
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
|
||||
if (i == -1) {
|
||||
free(buf);
|
||||
goto error;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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;
|
||||
|
||||
error:
|
||||
errvalid++;
|
||||
strcpy(errbuf, "findMain: ");
|
||||
strcat(errbuf, strerror(errno));
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Local Variables:
|
||||
* mode: c
|
||||
* c-basic-offset: 4
|
||||
* fill-column: 78
|
||||
* End:
|
||||
*/
|
||||
Reference in New Issue
Block a user