OpenSolaris_b135/cmd/sgs/rtld/common/globals.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1988 AT&T
* All Rights Reserved
*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <signal.h>
#include <dlfcn.h>
#include <synch.h>
#include <debug.h>
#include "_rtld.h"
/*
* Declarations of global variables used in ld.so.
*/
Rt_lock rtldlock;
int thr_flg_nolock = 0;
int thr_flg_reenter = 0;
/*
* Major link-map lists.
*/
Lm_list lml_main = { 0 }; /* the `main's link map list */
Lm_list lml_rtld = { 0 }; /* rtld's link map list */
/*
* Entrance count. Each time ld.so.1 is entered following initial process
* setup, this count is bumped. This value serves to identify the present
* ld.so.1 operation.
*
* An ld.so.1 operation can result in many symbol lookup requests (i.e., loading
* objects and relocating all symbolic bindings). This count is used to protect
* against attempting to re-load a failed lazy load within a single call to
* ld.so.1, while allowing such attempts across calls. Should a lazy load fail,
* the present operation identifier is saved in the current symbol lookup data
* block (Slookup). Should a lazy load fall back operation be triggered, the
* identifier in the symbol lookup block is compared to the current ld.so.1
* entry count, and if the two are equal the fall back is skipped.
*
* With this count, there is a danger of wrap-around, although as an unsigned
* 32-bit value, it is highly unlikely that any application could usefully make
* 4.3 giga-calls into ld.so.1. The worst that can occur is that a fall back
* lazy load isn't triggered. However, most lazy loads that fail typically
* continue to fail unless the user takes corrective action (adds the necessary
* (fixed) dependencies to the system).
*/
ulong_t ld_entry_cnt = 1;
/*
* BEGIN: Exposed to rtld_db, don't change without a coordinated handshake with
* librtld_db (remembering that librtld_db must be able to read old as well as
* current core files).
*/
APlist *dynlm_list = NULL; /* dynamic list of link-maps */
/*
* END: Exposed to rtld_db
*/
Reglist *reglist = NULL; /* list of register symbols */
/*
* Set of integers to track how many of what type of PLT's have been bound.
* This is only really interesting for SPARC since ia32 has only one PLT.
*/
uint32_t pltcnt21d = 0;
uint32_t pltcnt24d = 0;
uint32_t pltcntu32 = 0;
uint32_t pltcntu44 = 0;
uint32_t pltcntfull = 0;
uint32_t pltcntfar = 0;
/*
* AVL tree pointers.
*/
avl_tree_t *capavl = NULL; /* capabilities files */
avl_tree_t *nfavl = NULL; /* not-found path names */
avl_tree_t *spavl = NULL; /* secure path names */
/*
* Various other global data.
*/
uint_t rtld_flags = 0;
uint_t rtld_flags2 = 0;
Lc_desc glcs[CI_MAX]; /* global external interfaces */
const char *procname = NULL;
const char *rtldname = MSG_ORIG(MSG_FIL_RTLD);
char *lasterr = NULL; /* string describing last error */
/* cleared by each dlerror() */
Interp *interp = NULL; /* ELF interpreter info */
APlist *hdl_alp[HDLIST_SZ+2]; /* dlopen() handle list */
size_t syspagsz = 0; /* system page size */
ulong_t at_flags = 0; /* machine specific file flags */
Uts_desc *uts = NULL; /* utsname descriptor */
Isa_desc *isa = NULL; /* isalist descriptor */
uint_t audit_argcnt = 64; /* no. of stack args to copy (default */
/* is all) */
Audit_desc *auditors = NULL; /* global auditors (LD_AUDIT) */
const char *rpl_audit = NULL; /* replaceable LD_AUDIT string */
const char *rpl_debug = NULL; /* replaceable LD_DEBUG string */
const char *rpl_ldflags = NULL; /* replaceable LD_FLAGS string */
const char *rpl_libpath = NULL; /* replaceable LD_LIBRARY_PATH string */
Alist *rpl_libdirs = NULL; /* and associated Pdesc list */
const char *rpl_preload = NULL; /* replaceable LD_PRELOAD string */
const char *prm_audit = NULL; /* permanent LD_AUDIT string */
const char *prm_debug = NULL; /* permanent LD_DEBUG string */
const char *prm_ldflags = NULL; /* permanent LD_FLAGS string */
const char *prm_libpath = NULL; /* permanent LD_LIBRARY_PATH string */
Alist *prm_libdirs = NULL; /* and associated Pdesc list */
const char *prm_preload = NULL; /* permanent LD_PRELOAD string */
uint_t env_info = 0; /* information regarding environment */
/* variables */
int killsig = SIGKILL; /* signal sent on fatal exit */
APlist *free_alp = NULL; /* defragmentation list */
/*
* Capabilities are provided by the system. However, users can define an
* alternative set of system capabilities, where they can add, subtract, or
* override the system capabilities for testing purposes. Furthermore, these
* alternative capabilities can be specified such that they only apply to
* specified files rather than to all objects.
*/
static Syscapset scapset = { 0 };
Syscapset *org_scapset = &scapset; /* original system and */
Syscapset *alt_scapset = &scapset; /* alternative system */
/* capabilities */
const char *rpl_hwcap = NULL; /* replaceable hwcap str */
const char *rpl_sfcap = NULL; /* replaceable sfcap str */
const char *rpl_machcap = NULL; /* replaceable machcap str */
const char *rpl_platcap = NULL; /* replaceable platcap str */
const char *rpl_cap_files = NULL; /* associated files */
const char *prm_hwcap = NULL; /* permanent hwcap str */
const char *prm_sfcap = NULL; /* permanent sfcap str */
const char *prm_machcap = NULL; /* permanent machcap str */
const char *prm_platcap = NULL; /* permanent platcap str */
const char *prm_cap_files = NULL; /* associated files */
/*
* Note, the debugging descriptor interposes on the default definition provided
* by liblddbg. This is required as ld.so.1 must only have outstanding relative
* relocations.
*/
static Dbg_desc _dbg_desc = {0, 0, 0};
Dbg_desc *dbg_desc = &_dbg_desc; /* debugging descriptor */
const char *dbg_file = NULL; /* debugging directed to file */
#pragma weak environ = _environ /* environ for PLT tracing - we */
char **_environ = NULL; /* supply the pair to satisfy any */
/* libc requirements (hwmuldiv) */
const char *profile_name = NULL; /* object being profiled */
const char *profile_out = NULL; /* profile output file */
const char *profile_lib = NULL; /* audit library to perform profile */
uchar_t search_rules[] = { /* dependency search rules */
RPLENV, /* replaceable LD_LIBRARY_PATH */
PRMENV, /* permanent LD_LIBRARY_PATH */
RUNPATH, /* callers runpath */
DEFAULT, /* default library path */
0
};
Dl_argsinfo argsinfo = { 0 }; /* process argument, environment and */
/* auxv information. */
/*
* Frequently used messages are cached here to reduce _dgettext() overhead and
* also provide for resetting should the locale change (see _ld_libc()).
*/
const char *err_strs[ERR_NUM] = { NULL };
const char *nosym_str = NULL;
/*
* Rejection error message tables.
*/
const Msg
ldd_reject[] = {
MSG_STR_EMPTY,
MSG_LDD_REJ_MACH, /* MSG_INTL(MSG_LDD_REJ_MACH) */
MSG_LDD_REJ_CLASS, /* MSG_INTL(MSG_LDD_REJ_CLASS) */
MSG_LDD_REJ_DATA, /* MSG_INTL(MSG_LDD_REJ_DATA) */
MSG_LDD_REJ_TYPE, /* MSG_INTL(MSG_LDD_REJ_TYPE) */
MSG_LDD_REJ_BADFLAG, /* MSG_INTL(MSG_LDD_REJ_BADFLAG) */
MSG_LDD_REJ_MISFLAG, /* MSG_INTL(MSG_LDD_REJ_MISFLAG) */
MSG_LDD_REJ_VERSION, /* MSG_INTL(MSG_LDD_REJ_VERSION) */
MSG_LDD_REJ_HAL, /* MSG_INTL(MSG_LDD_REJ_HAL) */
MSG_LDD_REJ_US3, /* MSG_INTL(MSG_LDD_REJ_US3) */
MSG_LDD_REJ_STR, /* MSG_INTL(MSG_LDD_REJ_STR) */
MSG_LDD_REJ_UNKFILE, /* MSG_INTL(MSG_LDD_REJ_UNKFILE) */
MSG_LDD_REJ_UNKCAP, /* MSG_INTL(MSG_LDD_REJ_UNKCAP) */
MSG_LDD_REJ_HWCAP_1, /* MSG_INTL(MSG_LDD_REJ_HWCAP_1) */
MSG_LDD_REJ_SFCAP_1, /* MSG_INTL(MSG_LDD_REJ_SFCAP_1) */
MSG_LDD_REJ_MACHCAP, /* MSG_INTL(MSG_LDD_REJ_MACHCAP) */
MSG_LDD_REJ_PLATCAP, /* MSG_INTL(MSG_LDD_REJ_PLATCAP) */
MSG_LDD_REJ_HWCAP_2 /* MSG_INTL(MSG_LDD_REJ_HWCAP_2) */
};
const Msg
err_reject[] = {
MSG_STR_EMPTY,
MSG_ERR_REJ_MACH, /* MSG_INTL(MSG_ERR_REJ_MACH) */
MSG_ERR_REJ_CLASS, /* MSG_INTL(MSG_ERR_REJ_CLASS) */
MSG_ERR_REJ_DATA, /* MSG_INTL(MSG_ERR_REJ_DATA) */
MSG_ERR_REJ_TYPE, /* MSG_INTL(MSG_ERR_REJ_TYPE) */
MSG_ERR_REJ_BADFLAG, /* MSG_INTL(MSG_ERR_REJ_BADFLAG) */
MSG_ERR_REJ_MISFLAG, /* MSG_INTL(MSG_ERR_REJ_MISFLAG) */
MSG_ERR_REJ_VERSION, /* MSG_INTL(MSG_ERR_REJ_VERSION) */
MSG_ERR_REJ_HAL, /* MSG_INTL(MSG_ERR_REJ_HAL) */
MSG_ERR_REJ_US3, /* MSG_INTL(MSG_ERR_REJ_US3) */
MSG_ERR_REJ_STR, /* MSG_INTL(MSG_ERR_REJ_STR) */
MSG_ERR_REJ_UNKFILE, /* MSG_INTL(MSG_ERR_REJ_UNKFILE) */
MSG_ERR_REJ_UNKCAP, /* MSG_INTL(MSG_ERR_REJ_UNKCAP) */
MSG_ERR_REJ_HWCAP_1, /* MSG_INTL(MSG_ERR_REJ_HWCAP_1) */
MSG_ERR_REJ_SFCAP_1, /* MSG_INTL(MSG_ERR_REJ_SFCAP_1) */
MSG_ERR_REJ_MACHCAP, /* MSG_INTL(MSG_ERR_REJ_MACHCAP) */
MSG_ERR_REJ_PLATCAP, /* MSG_INTL(MSG_ERR_REJ_PLATCAP) */
MSG_ERR_REJ_HWCAP_2 /* MSG_INTL(MSG_ERR_REJ_HWCAP_2) */
};
const Msg
ldd_warn[] = {
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_STR_EMPTY,
MSG_LDD_WARN_UNKCAP, /* MSG_INTL(MSG_LDD_WARN_UNKCAP) */
MSG_LDD_WARN_HWCAP_1, /* MSG_INTL(MSG_LDD_WARN_HWCAP_1) */
MSG_LDD_WARN_SFCAP_1, /* MSG_INTL(MSG_LDD_WARN_SFCAP_1) */
MSG_LDD_WARN_MACHCAP, /* MSG_INTL(MSG_LDD_WARN_MACHCAP) */
MSG_LDD_WARN_PLATCAP, /* MSG_INTL(MSG_LDD_WARN_PLATCAP) */
MSG_LDD_WARN_HWCAP_2 /* MSG_INTL(MSG_LDD_WARN_HWCAP_2) */
};