Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/libexec/ld.aout_so/rtld.c

1920 lines
43 KiB
C
Raw Blame History

/* $NetBSD: rtld.c,v 1.85 2002/08/08 13:24:14 soren Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/errno.h>
#include <sys/mman.h>
#include <err.h>
#include <dlfcn.h>
#include <fcntl.h>
#include <a.out.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "shlib.h"
#include "ld.h"
#ifdef __m68k__
/*
* This is a slight hack to allow the same loader to be used on
* 4k and 8k __LDPGSZ executables.
*/
static int page_size = 0x2000;
#undef PAGSIZ
#define PAGSIZ page_size
#endif /* __m68k__ */
#ifndef MAP_ANON
#define MAP_ANON 0
#define anon_open() do { \
if ((anon_fd = open("/dev/zero", O_RDWR, 0)) == -1) \
err("open: %s", "/dev/zero"); \
} while (0)
#define anon_close() do { \
(void)close(anon_fd); \
anon_fd = -1; \
} while (0)
#else
#define anon_open()
#define anon_close()
#endif
/*
* Loader private data, hung off <so_map>->som_spd
*/
struct somap_private {
int spd_version;
struct so_map *spd_parent;
int spd_refcount;
int spd_flags;
#define _RTLD_MAIN 1 /* Marks the main program */
#define _RTLD_RTLD 2 /* Marks the run-time linker */
#define _RTLD_DL 4 /* A dlopen'ed object */
#define _RTLD_GLOBAL 8 /* Map is open to global search */
size_t spd_size;
int spd_symbolsize;
long spd_symbolbase;
char *spd_stringbase;
#ifdef SUN_COMPAT
long spd_offset; /* Correction for Sun main programs */
#endif
};
#define LM_PRIVATE(smp) ((struct somap_private *)(smp)->som_spd)
#ifdef SUN_COMPAT
#define LM_OFFSET(smp) (LM_PRIVATE(smp)->spd_offset)
#else
#define LM_OFFSET(smp) (0)
#endif
/* Base address for section_dispatch_table entries */
#define LM_LDBASE(smp) (smp->som_addr + LM_OFFSET(smp))
/* Start of text segment */
#define LM_TXTADDR(smp) (smp->som_addr == (caddr_t)0 ? PAGSIZ : 0)
/* Start of run-time relocation_info */
#define LM_REL(smp) ((struct relocation_info *) \
(smp->som_addr + LM_OFFSET(smp) + LD_REL((smp)->som_dynamic)))
/* Start of symbols */
#define LM_SYMBOLBASE(smp) ((long) \
(smp->som_addr + LM_OFFSET(smp) + LD_SYMBOL((smp)->som_dynamic)))
#define LM_SYMBOL(smp, i) ((struct nzlist *) \
(LM_PRIVATE(smp)->spd_symbolbase + \
(i) * LM_PRIVATE(smp)->spd_symbolsize))
/* Start of hash table */
#define LM_HASH(smp) ((struct rrs_hash *) \
((smp)->som_addr + LM_OFFSET(smp) + LD_HASH((smp)->som_dynamic)))
/* Start of strings */
#define LM_STRINGBASE(smp) ((char *) \
((smp)->som_addr + LM_OFFSET(smp) + LD_STRINGS((smp)->som_dynamic)))
/* Start of search paths */
#define LM_PATHS(smp) ((char *) \
((smp)->som_addr + LM_OFFSET(smp) + LD_PATHS((smp)->som_dynamic)))
/* End of text */
#define LM_ETEXT(smp) ((char *) \
((smp)->som_addr + LM_TXTADDR(smp) + LD_TEXTSZ((smp)->som_dynamic)))
/* PLT is in data segment, so don't use LM_OFFSET here */
#define LM_PLT(smp) ((jmpslot_t *) \
((smp)->som_addr + LD_PLT((smp)->som_dynamic)))
/* Parent of link map */
#define LM_PARENT(smp) (LM_PRIVATE(smp)->spd_parent)
static char __main_progname[] = "main";
static char *main_progname = __main_progname;
static char us[] = "/usr/libexec/ld.so";
char **environ;
char *__progname = us;
int errno;
static uid_t uid, euid;
static gid_t gid, egid;
static int careful;
static int anon_fd = -1;
struct so_map *link_map_head, *main_map;
struct so_map **link_map_tail = &link_map_head;
struct rt_symbol *rt_symbol_head;
static char *ld_library_path;
static char *ld_preload_path;
static int no_intern_search;
static int ld_suppress_warnings;
static int ld_warn_non_pure_code;
static int ld_tracing;
static void *__dlopen __P((const char *, int));
static int __dlclose __P((void *));
static void *__dlsym __P((void *, const char *));
static int __dlctl __P((void *, int, void *));
static void __dlexit __P((void));
static int __dladdr __P((const void *, Dl_info *));
static struct ld_entry ld_entry = {
__dlopen, __dlclose, __dlsym, __dlctl, __dlexit, __dladdr
};
void xprintf __P((char *, ...));
int rtld __P((int, struct crt_ldso *, struct _dynamic *));
void binder_entry __P((void));
long binder __P((jmpslot_t *));
static int load_subs __P((struct so_map *));
static struct so_map *map_object __P((struct sod *, struct so_map *));
static void unmap_object __P((struct so_map *));
static struct so_map *alloc_link_map __P(( char *, struct sod *,
struct so_map *, caddr_t,
size_t, struct _dynamic *));
static void free_link_map __P((struct so_map *));
static inline void check_text_reloc __P(( struct relocation_info *,
struct so_map *,
caddr_t));
static void init_maps __P((struct so_map *));
static void reloc_map __P((struct so_map *));
static void reloc_copy __P((struct so_map *));
static void call_map __P((struct so_map *, char *));
static char *rtfindlib __P((char *, int, int, int *, char *));
static struct nzlist *lookup __P(( const char *, struct so_map *,
struct so_map **, int));
static inline struct rt_symbol *lookup_rts __P((const char *));
static struct rt_symbol *enter_rts __P((const char *, long, int, caddr_t,
long, struct so_map *));
static void clear_rts __P((struct rt_symbol *));
static void maphints __P((void));
static void unmaphints __P((void));
static int hash_string __P((const char *));
static int hinthash __P((char *, int, int));
static char *findhint __P((char *, int, int, char *));
static void preload __P((char *));
static void ld_trace __P((struct so_map *));
static void build_sod __P((const char *, struct sod *));
static inline int
strcmp (register const char *s1, register const char *s2)
{
while (*s1 == *s2++)
if (*s1++ == 0)
return (0);
return (*(unsigned char *)s1 - *(unsigned char *)--s2);
}
/* `md-static-funcs.c' implements these functions: */
static void md_relocate_simple __P((struct relocation_info *,
long, char *));
#include "md-static-funcs.c"
/*
* Called from assembler stub that has set up crtp (passed from crt0)
* and dp (our __DYNAMIC).
*/
int
rtld(version, crtp, dp)
int version;
struct crt_ldso *crtp;
struct _dynamic *dp;
{
int n;
int nreloc; /* # of ld.so relocations */
struct relocation_info *reloc;
struct so_debug *ddp;
struct so_map *smp;
/* Check version */
if ( version != CRT_VERSION_BSD_2 &&
version != CRT_VERSION_BSD_3 &&
version != CRT_VERSION_BSD_4 &&
version != CRT_VERSION_SUN)
return -1;
/* Fixup __DYNAMIC structure */
(long)dp->d_un.d_sdt += crtp->crt_ba;
/* Divide by hand to avoid possible use of library division routine */
for ( nreloc = 0, n = LD_RELSZ(dp);
n > 0;
n -= sizeof(struct relocation_info) ) nreloc++;
/* Relocate ourselves */
for ( reloc = (struct relocation_info *)(LD_REL(dp) + crtp->crt_ba);
nreloc;
nreloc--, reloc++) {
register long addr = reloc->r_address + crtp->crt_ba;
md_relocate_simple(reloc, crtp->crt_ba, (char *)addr);
}
/* Now (and NOT BEFORE this point) we can call externals. */
if (version >= CRT_VERSION_BSD_4)
__progname = crtp->crt_ldso;
if (version >= CRT_VERSION_BSD_3)
main_progname = crtp->crt_prog;
/* Setup out (private) environ variable */
environ = crtp->crt_ep;
/*
* Make sure we do not allow the library search path
* to be modified through the environment if we are
* running either setuid or setgid.
*/
uid = getuid(); euid = geteuid();
gid = getgid(); egid = getegid();
careful = (uid != euid) || (gid != egid);
if (careful) {
unsetenv("LD_LIBRARY_PATH");
unsetenv("LD_PRELOAD");
}
#ifdef __m68k__
/*
* Locate the a.out header and check the machine ID.
* If we see MID_M68K4K, we alter the page size we
* use for address calculations. This allows the
* same loader to be used for 4k and 8k executables
* and libraries. Trust me; the world is a better
* place because this.
*/
{
register long textaddr;
register struct exec *eh;
/* XXX Assume this is near the start of text. */
textaddr = ((long)crtp->crt_bp) & ~0xFFF;
eh = (struct exec *) textaddr;
#if 0
xprintf("%s: textaddr is 0x%x\n", us, textaddr);
xprintf("\t magic=0x%x\n", eh->a_midmag);
#endif
/*
* Use this rather than N_PAGSIZ(), to be
* safe...
*/
if (N_GETMID((*eh)) == MID_M68K4K)
page_size = 0x1000;
#if 0
xprintf("\t page_size=%d\n", page_size);
#endif
}
#endif /* __m68k__ */
/* Setup directory search */
ld_library_path = getenv("LD_LIBRARY_PATH");
add_search_path(ld_library_path);
if (getenv("LD_NOSTD_PATH") == NULL)
std_search_path();
ld_suppress_warnings = getenv("LD_SUPPRESS_WARNINGS") != NULL;
ld_warn_non_pure_code = getenv("LD_WARN_NON_PURE_CODE") != NULL;
no_intern_search = getenv("LD_NO_INTERN_SEARCH") != 0;
anon_open();
/*
* Init object administration. We start off with a map description
* for `main' and `rtld'.
*/
smp = alloc_link_map(main_progname, (struct sod *)0, (struct so_map *)0,
(caddr_t)0, 0, crtp->crt_dp);
LM_PRIVATE(smp)->spd_refcount++;
LM_PRIVATE(smp)->spd_flags |= _RTLD_MAIN | _RTLD_GLOBAL;
main_map = smp;
smp = alloc_link_map(us, (struct sod *)0, (struct so_map *)0,
(caddr_t)crtp->crt_ba, 0, dp);
LM_PRIVATE(smp)->spd_refcount++;
LM_PRIVATE(smp)->spd_flags |= _RTLD_RTLD;
/* Fill in some field in main's __DYNAMIC structure */
if (version >= CRT_VERSION_BSD_4)
crtp->crt_ldentry = &ld_entry;
else
crtp->crt_dp->d_entry = &ld_entry;
/* Handle LD_PRELOAD's here */
ld_preload_path = getenv("LD_PRELOAD");
if (ld_preload_path != NULL)
preload(ld_preload_path);
/* Load subsidiary objects into the process address space */
ld_tracing = (int)getenv("LD_TRACE_LOADED_OBJECTS");
load_subs(link_map_head);
if (ld_tracing) {
ld_trace(link_map_head);
exit(0);
}
init_maps(link_map_head);
crtp->crt_dp->d_un.d_sdt->sdt_loaded = link_map_head->som_next;
ddp = crtp->crt_dp->d_debug;
ddp->dd_cc = rt_symbol_head;
if (ddp->dd_in_debugger) {
caddr_t addr = (caddr_t)((long)crtp->crt_bp & (~(PAGSIZ - 1)));
/* Set breakpoint for the benefit of debuggers */
if (mprotect(addr, PAGSIZ,
PROT_READ|PROT_WRITE|PROT_EXEC) == -1) {
err(1, "Cannot set breakpoint (%s)", main_progname);
}
md_set_breakpoint((long)crtp->crt_bp, (long *)&ddp->dd_bpt_shadow);
if (mprotect(addr, PAGSIZ, PROT_READ|PROT_EXEC) == -1) {
err(1, "Cannot re-protect breakpoint (%s)",
main_progname);
}
ddp->dd_bpt_addr = crtp->crt_bp;
if (link_map_head)
ddp->dd_sym_loaded = 1;
}
/* Close the hints file */
unmaphints();
/* Close our file descriptor */
(void)close(crtp->crt_ldfd);
anon_close();
return 0;
}
static int
load_subs(smp)
struct so_map *smp;
{
int flag = 0;
/* Propagate _RTLD_GLOBAL parent flag */
flag |= (LM_PRIVATE(smp)->spd_flags & _RTLD_GLOBAL);
for (; smp; smp = smp->som_next) {
struct sod *sodp;
long next = 0;
if (LM_PRIVATE(smp)->spd_flags & _RTLD_RTLD)
continue;
if (smp->som_dynamic)
next = LD_NEED(smp->som_dynamic);
while (next) {
struct so_map *newmap;
sodp = (struct sod *)(LM_LDBASE(smp) + next);
if ((newmap = map_object(sodp, smp)) == NULL) {
if (!ld_tracing) {
char *fmt = sodp->sod_library ?
"%s: lib%s.so.%d.%d" :
"%s: %s";
err(1, fmt, main_progname,
sodp->sod_name+LM_LDBASE(smp),
sodp->sod_major,
sodp->sod_minor);
}
newmap = alloc_link_map(NULL, sodp, smp, 0, 0, 0);
}
LM_PRIVATE(newmap)->spd_refcount++;
/* Note: existing maps also acquire the new flag */
LM_PRIVATE(newmap)->spd_flags |= flag;
next = sodp->sod_next;
}
}
return 0;
}
void
ld_trace(smp)
struct so_map *smp;
{
char *fmt1, *fmt2, *fmt, *main_local;
int c;
if ((main_local = getenv("LD_TRACE_LOADED_OBJECTS_PROGNAME")) == NULL)
main_local = "";
if ((fmt1 = getenv("LD_TRACE_LOADED_OBJECTS_FMT1")) == NULL)
fmt1 = "\t-l%o.%m => %p (%x)\n";
if ((fmt2 = getenv("LD_TRACE_LOADED_OBJECTS_FMT2")) == NULL)
fmt2 = "\t%o (%x)\n";
for (; smp; smp = smp->som_next) {
struct sod *sodp;
char *name, *path;
if ((sodp = smp->som_sod) == NULL)
continue;
name = (char *)sodp->sod_name;
if (LM_PARENT(smp))
name += (long)LM_LDBASE(LM_PARENT(smp));
if ((path = smp->som_path) == NULL)
path = "not found";
fmt = sodp->sod_library ? fmt1 : fmt2;
while ((c = *fmt++) != '\0') {
switch (c) {
default:
putchar(c);
continue;
case '\\':
switch (c = *fmt) {
case '\0':
continue;
case 'n':
putchar('\n');
break;
case 't':
putchar('\t');
break;
}
break;
case '%':
switch (c = *fmt) {
case '\0':
continue;
case '%':
default:
putchar(c);
break;
case 'A':
printf("%s", main_local);
break;
case 'a':
printf("%s", main_progname);
break;
case 'o':
printf("%s", name);
break;
case 'm':
printf("%d", sodp->sod_major);
break;
case 'n':
printf("%d", sodp->sod_minor);
break;
case 'p':
printf("%s", path);
break;
case 'x':
printf("%p", smp->som_addr);
break;
}
break;
}
++fmt;
}
}
}
/*
* Allocate a new link map for shared object NAME loaded at ADDR as a
* result of the presence of link object LOP in the link map PARENT.
*/
static struct so_map *
alloc_link_map(path, sodp, parent, addr, size, dp)
char *path;
struct sod *sodp;
struct so_map *parent;
caddr_t addr;
size_t size;
struct _dynamic *dp;
{
struct so_map *smp;
struct somap_private *smpp;
smpp = (struct somap_private *)xmalloc(sizeof(struct somap_private));
smp = (struct so_map *)xmalloc(sizeof(struct so_map));
smp->som_next = NULL;
*link_map_tail = smp;
link_map_tail = &smp->som_next;
/*smp->som_sodbase = 0; NOT USED */
smp->som_write = 0;
smp->som_addr = addr;
smp->som_path = path?strdup(path):NULL;
smp->som_sod = sodp;
smp->som_dynamic = dp;
smp->som_spd = (caddr_t)smpp;
smpp->spd_refcount = 0;
smpp->spd_flags = 0;
smpp->spd_parent = parent;
smpp->spd_size = size;
if (dp == NULL)
return (smp);
#ifdef SUN_COMPAT
smpp->spd_offset =
(addr==0 && dp->d_version==LD_VERSION_SUN) ? PAGSIZ : 0;
#endif
/*
* Pre-compute the location of symbol and string tables;
* they do not change while this object is loaded.
*/
smpp->spd_symbolsize = LD_VERSION_NZLIST_P(dp->d_version)
? sizeof(struct nzlist)
: sizeof(struct nlist);
smpp->spd_symbolbase = LM_SYMBOLBASE(smp);
smpp->spd_stringbase = LM_STRINGBASE(smp);
return (smp);
}
/*
* Free the link map for an object being unmapped. The link map
* has already been removed from the link map list, so it can't be used
* after it's been unmapped.
*/
static void
free_link_map(smp)
struct so_map *smp;
{
if ((LM_PRIVATE(smp)->spd_flags & _RTLD_DL) != 0) {
/* free synthetic sod structure allocated in __dlopen() */
free((char *)smp->som_sod->sod_name);
free(smp->som_sod);
}
/* free the link map structure. */
free(smp->som_spd);
if (smp->som_path != NULL)
free(smp->som_path);
free(smp);
}
/*
* Map object identified by link object SODP which was found
* in link map SMP.
*/
static struct so_map *
map_object(sodp, smp)
struct sod *sodp;
struct so_map *smp;
{
char *name;
struct _dynamic *dp;
char *path, *ipath;
int fd;
caddr_t addr;
struct exec hdr;
int usehints = 0;
struct so_map *p;
name = (char *)sodp->sod_name;
if (smp)
name += (long)LM_LDBASE(smp);
#ifdef DEBUG
xprintf("map_object: loading %s\n", name);
#endif
if (sodp->sod_library) {
usehints = 1;
again:
if (smp == NULL || no_intern_search ||
LD_PATHS(smp->som_dynamic) == 0) {
ipath = NULL;
} else {
ipath = LM_PATHS(smp);
add_search_path(ipath);
}
path = rtfindlib(name, sodp->sod_major,
sodp->sod_minor, &usehints, ipath);
if (ipath)
remove_search_path(ipath);
if (path == NULL) {
errno = ENOENT;
return NULL;
}
} else {
if (careful && *name != '/') {
errno = EACCES;
return NULL;
}
path = name;
}
/* Check if already loaded */
for (p = link_map_head; p; p = p->som_next)
if (p->som_path && strcmp(p->som_path, path) == 0)
break;
if (p != NULL)
return p;
if ((fd = open(path, O_RDONLY, 0)) == -1) {
if (usehints) {
usehints = 0;
goto again;
}
return NULL;
}
if (read(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) {
(void)close(fd);
/*errno = x;*/
return NULL;
}
if (N_BADMAG(hdr)) {
(void)close(fd);
errno = EFTYPE;
return NULL;
}
if ((addr = mmap(0, hdr.a_text + hdr.a_data + hdr.a_bss,
PROT_READ|PROT_EXEC,
MAP_FILE|MAP_PRIVATE, fd, 0)) == (caddr_t)-1) {
(void)close(fd);
return NULL;
}
#if DEBUG
xprintf("map1: 0x%x for 0x%x\n", addr, hdr.a_text + hdr.a_data + hdr.a_bss);
#endif
if (mprotect(addr + hdr.a_text, hdr.a_data,
PROT_READ|PROT_WRITE|PROT_EXEC) != 0) {
(void)close(fd);
return NULL;
}
if (mmap(addr + hdr.a_text + hdr.a_data, hdr.a_bss,
PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_ANON|MAP_PRIVATE|MAP_FIXED,
anon_fd, 0) == (caddr_t)-1) {
(void)close(fd);
return NULL;
}
(void)close(fd);
/* Assume _DYNAMIC is the first data item */
dp = (struct _dynamic *)(addr+hdr.a_text);
/* Fixup __DYNAMIC structure */
(long)dp->d_un.d_sdt += (long)addr;
return alloc_link_map(path, sodp, smp, addr,
hdr.a_text + hdr.a_data + hdr.a_bss, dp);
}
/*
* Unmap a mapped object.
*/
static void
unmap_object(smp)
struct so_map *smp;
{
struct so_map *p, **pp;
struct rt_symbol *rtsp, *rtp;
/* remove from link map list */
pp = &link_map_head;
while ((p = *pp) != NULL) {
if (p == smp)
break;
pp = &p->som_next;
}
if (p == NULL) {
warnx("warning: link map entry for %s not on link map list!",
smp->som_path);
return;
}
*pp = smp->som_next; /* make list skip it */
if (link_map_tail == &smp->som_next) /* and readjust tail pointer */
link_map_tail = pp;
/* unmap from address space */
(void)munmap(smp->som_addr, LM_PRIVATE(smp)->spd_size);
/* remove any globals from the global list that reference this smp */
while (rt_symbol_head->rt_smp == smp) {
rtp = rt_symbol_head;
rt_symbol_head = rtp->rt_next;
clear_rts(rtp);
}
for (rtsp = rt_symbol_head; (rtp = rtsp->rt_next) != NULL;) {
if (rtp->rt_smp == smp) {
rtsp->rt_next = rtp->rt_next;
clear_rts(rtp);
} else {
rtsp->rt_next = rtsp->rt_next;
}
}
}
void
init_maps(head)
struct so_map *head;
{
struct so_map *smp;
/* Relocate all loaded objects according to their RRS segments */
for (smp = head; smp; smp = smp->som_next) {
if (LM_PRIVATE(smp)->spd_flags & _RTLD_RTLD)
continue;
reloc_map(smp);
}
/* Copy any relocated initialized data. */
for (smp = head; smp; smp = smp->som_next) {
if (LM_PRIVATE(smp)->spd_flags & _RTLD_RTLD)
continue;
reloc_copy(smp);
}
/* Call any object initialization routines. */
for (smp = head; smp; smp = smp->som_next) {
if (LM_PRIVATE(smp)->spd_flags & _RTLD_RTLD)
continue;
call_map(smp, ".init");
call_map(smp, "__init");
}
}
static inline void
check_text_reloc(r, smp, addr)
struct relocation_info *r;
struct so_map *smp;
caddr_t addr;
{
char *sym;
if (addr >= LM_ETEXT(smp))
return;
if (RELOC_EXTERN_P(r))
sym = LM_PRIVATE(smp)->spd_stringbase +
LM_SYMBOL(smp, RELOC_SYMBOL(r))->nz_strx;
else
sym = "";
if (ld_warn_non_pure_code && !ld_suppress_warnings)
warnx("warning: non pure code in %s at %x (%s)",
smp->som_path, r->r_address, sym);
if (smp->som_write == 0 &&
mprotect(smp->som_addr + LM_TXTADDR(smp),
LD_TEXTSZ(smp->som_dynamic),
PROT_READ|PROT_WRITE|PROT_EXEC) == -1) {
err(1, "Cannot enable writes to %s:%s",
main_progname, smp->som_path);
}
smp->som_write = 1;
}
static void
reloc_map(smp)
struct so_map *smp;
{
struct _dynamic *dp = smp->som_dynamic;
struct relocation_info *r = LM_REL(smp);
struct relocation_info *rend = r + LD_RELSZ(dp)/sizeof(*r);
long symbolbase = LM_PRIVATE(smp)->spd_symbolbase;
char *stringbase = LM_PRIVATE(smp)->spd_stringbase;
int symsize = LM_PRIVATE(smp)->spd_symbolsize;
if (LD_PLTSZ(dp))
md_fix_jmpslot(LM_PLT(smp),
(long)LM_PLT(smp), (long)binder_entry, 1);
for (; r < rend; r++) {
char *sym;
caddr_t addr = smp->som_addr + r->r_address;
check_text_reloc(r, smp, addr);
if (RELOC_EXTERN_P(r)) {
struct so_map *src_map = NULL;
struct nzlist *p, *np;
long relocation = md_get_addend(r, addr);
if (RELOC_LAZY_P(r))
continue;
p = (struct nzlist *)
(symbolbase + symsize * RELOC_SYMBOL(r));
if (p->nz_type == (N_SETV + N_EXT))
src_map = smp;
sym = stringbase + p->nz_strx;
#if defined(__arm32__) && 1 /* XXX MAGIC! */
if (r->r_baserel && r->r_length == 2)
relocation = 0;
#endif
np = lookup(sym, smp, &src_map, 0/*XXX-jumpslots!*/);
if (np == NULL)
errx(1, "Undefined symbol \"%s\" in %s:%s",
sym, main_progname, smp->som_path);
/*
* Found symbol definition.
* If it's in a link map, adjust value
* according to the load address of that map.
* Otherwise it's a run-time allocated common
* whose value is already up-to-date.
*/
relocation += np->nz_value;
if (src_map)
relocation += (long)src_map->som_addr;
if (RELOC_PCREL_P(r))
relocation -= (long)smp->som_addr;
if (RELOC_COPY_P(r) && src_map) {
if (p->nz_size != np->nz_size)
warnx("symbol %s at %p in %s changed "
"size: expected %ld, actual %ld",
sym,
src_map->som_addr + np->nz_value,
src_map->som_path,
p->nz_size, np->nz_size);
(void)enter_rts(sym,
(long)addr,
N_DATA + N_EXT,
src_map->som_addr + np->nz_value,
p->nz_size, src_map);
continue;
}
md_relocate(r, relocation, addr, 0);
} else {
md_relocate(r,
#ifdef SUN_COMPAT
md_get_rt_segment_addend(r, addr)
#else
md_get_addend(r, addr)
#endif
+ (long)smp->som_addr, addr, 0);
}
}
if (smp->som_write) {
if (mprotect(smp->som_addr + LM_TXTADDR(smp),
LD_TEXTSZ(smp->som_dynamic),
PROT_READ|PROT_EXEC) == -1) {
err(1, "Cannot disable writes to %s:%s",
main_progname, smp->som_path);
}
smp->som_write = 0;
}
}
static void
reloc_copy(smp)
struct so_map *smp;
{
struct rt_symbol *rtsp;
for (rtsp = rt_symbol_head; rtsp; rtsp = rtsp->rt_next)
if ((rtsp->rt_smp == NULL || rtsp->rt_smp == smp) &&
rtsp->rt_sp->nz_type == N_DATA + N_EXT) {
bcopy(rtsp->rt_srcaddr, (caddr_t)rtsp->rt_sp->nz_value,
rtsp->rt_sp->nz_size);
}
}
static void
call_map(smp, sym)
struct so_map *smp;
char *sym;
{
struct so_map *src_map = smp;
struct nzlist *np;
np = lookup(sym, smp, &src_map, 1);
if (np) {
#if DEBUG
xprintf("call_map: %s at %#x+%#x enter\n", sym, src_map->som_addr, np->nz_value);
#endif
#if defined(__arm32__) && 1 /* XXX MAGIC! */
(*(void (*) __P((u_int)))(src_map->som_addr + np->nz_value))((u_int)src_map->som_addr);
#else
(*(void (*) __P((void)))(src_map->som_addr + np->nz_value))();
#endif
#if DEBUG
xprintf("call_map: %s at %#x+%#x exit\n", sym, src_map->som_addr, np->nz_value);
#endif
}
}
/*
* Run-time common symbol table.
*/
#define RTC_TABSIZE 57
static struct rt_symbol *rt_symtab[RTC_TABSIZE];
/*
* Compute hash value for run-time symbol table
*/
static inline int
hash_string(key)
const char *key;
{
const char *cp;
int k;
cp = key;
k = 0;
while (*cp)
k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
return k;
}
/*
* Lookup KEY in the run-time common symbol table.
*/
static inline struct rt_symbol *
lookup_rts(key)
const char *key;
{
register int hashval;
register struct rt_symbol *rtsp;
/* Determine which bucket. */
hashval = hash_string(key) % RTC_TABSIZE;
/* Search the bucket. */
for (rtsp = rt_symtab[hashval]; rtsp; rtsp = rtsp->rt_link)
if (strcmp(key, rtsp->rt_sp->nz_name) == 0)
return rtsp;
return NULL;
}
static struct rt_symbol *
enter_rts(name, value, type, srcaddr, size, smp)
const char *name;
long value;
int type;
caddr_t srcaddr;
long size;
struct so_map *smp;
{
register int hashval;
register struct rt_symbol *rtsp, **rpp;
/* Determine which bucket */
hashval = hash_string(name) % RTC_TABSIZE;
/* Find end of bucket */
for (rpp = &rt_symtab[hashval]; *rpp; rpp = &(*rpp)->rt_link)
;
/* Allocate new common symbol */
rtsp = (struct rt_symbol *)malloc(sizeof(struct rt_symbol));
rtsp->rt_sp = (struct nzlist *)malloc(sizeof(struct nzlist));
rtsp->rt_sp->nz_name = strdup(name);
rtsp->rt_sp->nz_value = value;
rtsp->rt_sp->nz_type = type;
rtsp->rt_sp->nz_size = size;
rtsp->rt_srcaddr = srcaddr;
rtsp->rt_smp = smp;
rtsp->rt_link = NULL;
/* Link onto linear list as well */
rtsp->rt_next = rt_symbol_head;
rt_symbol_head = rtsp;
*rpp = rtsp;
return rtsp;
}
static void
clear_rts(rtp)
struct rt_symbol *rtp;
{
struct rt_symbol *lrt;
int hashval = hash_string(rtp->rt_sp->nz_name) % RTC_TABSIZE;
if (rtp == rt_symtab[hashval]) {
rt_symtab[hashval] = rtp->rt_next;
} else {
for (lrt = rt_symtab[hashval]; lrt->rt_link;
lrt = lrt->rt_link) {
if (lrt->rt_link == rtp) {
lrt->rt_link = rtp->rt_link->rt_link;
}
}
}
free(rtp->rt_sp);
free(rtp);
}
/*
* Lookup NAME in the link maps. The link map producing a definition
* is returned in SRC_MAP. If SRC_MAP is not NULL on entry the search is
* confined to that map. If STRONG is set, the symbol returned must
* have a proper type (used by binder()).
*/
static struct nzlist *
lookup(name, ref_map, src_map, strong)
const char *name;
struct so_map *ref_map; /* map cont. the reference */
struct so_map **src_map; /* map cont. the definition IN/OUT */
int strong;
{
long common_size = 0;
struct so_map *smp, *weak_smp;
struct rt_symbol *rtsp;
struct nzlist *weak_np = 0;
if ((rtsp = lookup_rts(name)) != NULL) {
/* common symbol is not a member of particular shlib */
*src_map = NULL;
return (rtsp->rt_sp);
}
weak_smp = NULL; /* XXX - gcc! */
/*
* Search all maps for a definition of NAME
*/
for (smp = link_map_head; smp; smp = smp->som_next) {
int buckets;
long hashval;
struct rrs_hash *hp;
char *cp;
struct nzlist *np;
/* Some local caching */
long symbolbase;
struct rrs_hash *hashbase;
char *stringbase;
int symsize;
np = NULL; /* XXX - gcc! */
if (*src_map && smp != *src_map)
continue;
/*
* When doing a global search, consider only maps
* marked for global lookup.
*/
if (*src_map == NULL && smp != ref_map &&
(LM_PRIVATE(smp)->spd_flags & _RTLD_GLOBAL) == 0)
continue;
if ((buckets = LD_BUCKETS(smp->som_dynamic)) == 0)
continue;
if (LM_PRIVATE(smp)->spd_flags & _RTLD_RTLD)
continue;
restart:
/*
* Compute bucket in which the symbol might be found.
*/
for (hashval = 0, cp = (char *) name; *cp; cp++)
hashval = (hashval << 1) + *cp;
hashval = (hashval & 0x7fffffff) % buckets;
hashbase = LM_HASH(smp);
hp = hashbase + hashval;
if (hp->rh_symbolnum == -1)
/* Nothing in this bucket */
continue;
symbolbase = LM_PRIVATE(smp)->spd_symbolbase;
stringbase = LM_PRIVATE(smp)->spd_stringbase;
symsize = LM_PRIVATE(smp)->spd_symbolsize;
while (hp) {
np = (struct nzlist *)
(symbolbase + hp->rh_symbolnum * symsize);
cp = stringbase + np->nz_strx;
if (strcmp(cp, name) == 0)
break;
if (hp->rh_next == 0)
hp = NULL;
else
hp = hashbase + hp->rh_next;
}
if (hp == NULL)
/* Nothing in this bucket */
continue;
/*
* We have a symbol with the name we're looking for.
*/
if (np->nz_type == N_INDR+N_EXT) {
/*
* Next symbol gives the aliased name. Restart
* search with new name and confine to this map.
*/
name = stringbase + (++np)->nz_strx;
*src_map = smp;
goto restart;
}
if (np->nz_value == 0)
/* It's not a definition */
continue;
if (np->nz_type == N_UNDF+N_EXT && np->nz_value != 0) {
if (N_AUX(&np->nlist) == AUX_FUNC) {
/* It's a `weak' function definition */
if (strong)
continue;
} else {
/* It's a common, note value and continue search */
if (common_size < np->nz_value)
common_size = np->nz_value;
continue;
}
}
if (N_BIND(&np->nlist) == BIND_WEAK && weak_np == 0) {
weak_np = np;
weak_smp = smp;
continue;
}
*src_map = smp;
return np;
}
if (weak_np) {
*src_map = weak_smp;
return weak_np;
}
if (common_size == 0)
/* Not found */
return NULL;
/*
* It's a common, enter into run-time common symbol table.
*/
rtsp = enter_rts(name, (long)calloc(1, common_size),
N_UNDF + N_EXT, 0, common_size, NULL);
/* common symbol is not a member of particular shlib */
*src_map = NULL;
#if DEBUG
xprintf("Allocating common: %s size %d at %#x\n", name, common_size, rtsp->rt_sp->nz_value);
#endif
return rtsp->rt_sp;
}
/*
* Find the symbol in any mapped object that is closest to, but not
* exceeds, the given address.
*/
static int
__dladdr(addr, dli)
const void *addr;
Dl_info *dli;
{
struct so_map *smp;
struct rt_symbol *rtsp;
int i, found = 0;
/*
* First look for an exact match in the commons table.
*/
for (i = 0; i < RTC_TABSIZE; i++) {
for (rtsp = rt_symtab[i]; rtsp; rtsp = rtsp->rt_link)
if (rtsp->rt_sp->nz_value == (long)addr) {
dli->dli_fname = 0;
dli->dli_fbase = 0;
dli->dli_sname = rtsp->rt_sp->nz_name;
dli->dli_saddr = (void *)addr;
return (1);
}
}
/*
* Search all symbols tables for a ADDR
*/
for (smp = link_map_head; smp; smp = smp->som_next) {
struct so_map *src_map = smp;
int buckets;
struct rrs_hash *hp;
struct nzlist *np;
caddr_t cur = 0;
/* Some local caching */
long symbolbase;
struct rrs_hash *hashbase;
char *stringbase;
int symsize;
#if 0
if ((LM_PRIVATE(smp)->spd_flags & _RTLD_GLOBAL) == 0)
continue;
#endif
if (LM_PRIVATE(smp)->spd_flags & _RTLD_RTLD)
continue;
if ((caddr_t)addr < smp->som_addr)
continue;
np = lookup("_end", smp, &src_map, 1);
if ((caddr_t)addr > np->nz_value + smp->som_addr)
continue;
if ((buckets = LD_BUCKETS(smp->som_dynamic)) == 0)
continue;
/*
* Walk the entire symbol table of this object
* in search for the nearest symbol.
*/
hashbase = LM_HASH(smp);
symbolbase = LM_PRIVATE(smp)->spd_symbolbase;
stringbase = LM_PRIVATE(smp)->spd_stringbase;
symsize = LM_PRIVATE(smp)->spd_symbolsize;
for (i = 0; i < buckets; i++) {
hp = hashbase + i;
if (hp->rh_symbolnum == -1)
/* Nothing in this bucket */
continue;
while (hp) {
caddr_t v;
np = (struct nzlist *)
(symbolbase + hp->rh_symbolnum * symsize);
hp = (hp->rh_next == 0)
? NULL
: hashbase + hp->rh_next;
/* Skip any undefined symbol */
if (np->nz_type == N_UNDF+N_EXT)
continue;
/* Compute absolute address */
v = np->nz_value + src_map->som_addr;
/*
* Make this symbol the new candidate if it
* is closer to, but not exceeding, ADDR.
*/
if (v >= cur && v <= (caddr_t)addr) {
dli->dli_fname = smp->som_path;
dli->dli_fbase = LM_LDBASE(smp);
dli->dli_sname = stringbase +
np->nz_strx;
dli->dli_saddr = v;
if (v == addr)
return (1);
cur = v;
found = 1;
}
}
}
if (found)
return (1);
}
return (0);
}
/*
* This routine is called from the jumptable to resolve
* procedure calls to shared objects.
*/
long
binder(jsp)
jmpslot_t *jsp;
{
struct so_map *smp, *src_map = NULL;
long addr;
char *sym;
struct nzlist *np;
int index;
/*
* Find the PLT map that contains JSP.
*/
for (smp = link_map_head; smp; smp = smp->som_next) {
if (LM_PLT(smp) < jsp &&
jsp < LM_PLT(smp) + LD_PLTSZ(smp->som_dynamic)/sizeof(*jsp))
break;
}
if (smp == NULL)
errx(1, "Call to binder from unknown location: %p", jsp);
index = jsp->reloc_index & JMPSLOT_RELOC_MASK;
/* Get the local symbol this jmpslot refers to */
sym = LM_PRIVATE(smp)->spd_stringbase +
LM_SYMBOL(smp,RELOC_SYMBOL(&LM_REL(smp)[index]))->nz_strx;
np = lookup(sym, smp, &src_map, 1);
if (np == NULL)
errx(1, "Undefined symbol \"%s\" called from %s:%s at %p",
sym, main_progname, smp->som_path, jsp);
/* Fixup jmpslot so future calls transfer directly to target */
addr = np->nz_value;
if (src_map)
addr += (long)src_map->som_addr;
md_fix_jmpslot(jsp, (long)jsp, addr, 0);
#if DEBUG
xprintf(" BINDER: %s located at %d(%p) = %#x in %s\n", sym, index, jsp, addr, src_map->som_path);
#endif
return addr;
}
static int hfd;
static size_t hsize;
static struct hints_header *hheader;
static struct hints_bucket *hbuckets;
static char *hstrtab;
static char *hint_search_path = "";
#define HINTS_VALID (hheader != NULL && hheader != (struct hints_header *)-1)
static void
maphints()
{
caddr_t addr;
struct stat statbuf;
if ((hfd = open(_PATH_LD_HINTS, O_RDONLY, 0)) == -1)
goto nohints;
if (fstat(hfd, &statbuf) != 0 ||
(hsize = (size_t)statbuf.st_size) < sizeof(struct hints_header))
goto nohints;
hsize = (hsize + PAGSIZ - 1) & -PAGSIZ;
addr = mmap(0, hsize, PROT_READ, MAP_FILE|MAP_PRIVATE, hfd, 0);
if (addr == (caddr_t)-1)
goto nohints;
hheader = (struct hints_header *)addr;
if (HH_BADMAG(*hheader) || hheader->hh_ehints > hsize) {
munmap(addr, hsize);
goto nohints;
}
if (hheader->hh_version != LD_HINTS_VERSION_1 &&
hheader->hh_version != LD_HINTS_VERSION_2) {
munmap(addr, hsize);
goto nohints;
}
hbuckets = (struct hints_bucket *)(addr + hheader->hh_hashtab);
hstrtab = (char *)(addr + hheader->hh_strtab);
if (hheader->hh_version >= LD_HINTS_VERSION_2)
hint_search_path = hstrtab + hheader->hh_dirlist;
return;
nohints:
if (hfd >= 0)
close(hfd);
hheader = (struct hints_header *)-1;
return;
}
static void
unmaphints()
{
if (HINTS_VALID) {
munmap((caddr_t)hheader, hsize);
close(hfd);
hheader = NULL;
}
}
int
hinthash(cp, vmajor, vminor)
char *cp;
int vmajor, vminor;
{
int k = 0;
while (*cp)
k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
if (hheader->hh_version == LD_HINTS_VERSION_1)
k = (((k << 1) + (k >> 14)) ^ (vminor*167)) & 0x3fff;
return k;
}
#undef major
#undef minor
static char *
findhint(name, major, minor, prefered_path)
char *name;
int major, minor;
char *prefered_path;
{
struct hints_bucket *bp;
if (hheader->hh_nbucket == 0)
return (NULL);
bp = hbuckets + (hinthash(name, major, minor) % hheader->hh_nbucket);
while (1) {
/* Sanity check */
if (bp->hi_namex >= hheader->hh_strtab_sz) {
warnx("Bad name index: %#x", bp->hi_namex);
break;
}
if (bp->hi_pathx >= hheader->hh_strtab_sz) {
warnx("Bad path index: %#x", bp->hi_pathx);
break;
}
if (strcmp(name, hstrtab + bp->hi_namex) == 0) {
/* It's `name', check version numbers */
if (bp->hi_major == major &&
(bp->hi_ndewey < 2 || bp->hi_minor >= minor)) {
if (prefered_path == NULL ||
strncmp(prefered_path,
hstrtab + bp->hi_pathx,
strlen(prefered_path)) == 0) {
return hstrtab + bp->hi_pathx;
}
}
}
if (bp->hi_next == -1)
break;
/* Move on to next in bucket */
bp = &hbuckets[bp->hi_next];
}
/* No hints available for name */
return NULL;
}
static char *
rtfindlib(name, major, minor, usehints, ipath)
char *name;
int major, minor;
int *usehints;
char *ipath;
{
register char *cp;
int realminor;
if (hheader == NULL)
maphints();
if (!HINTS_VALID || !(*usehints))
goto lose;
/* NOTE: `ipath' may reside in a piece of read-only memory */
if (ld_library_path || ipath) {
/* Prefer paths from some explicit LD_LIBRARY_PATH */
register char *lpath;
char *dp;
dp = lpath = concat(ld_library_path ? ld_library_path : "",
(ld_library_path && ipath) ? ":" : "",
ipath ? ipath : "");
while ((cp = strsep(&dp, ":")) != NULL) {
cp = findhint(name, major, minor, cp);
if (cp) {
free(lpath);
return cp;
}
}
free(lpath);
/*
* Not found in hints; try directory search now, before
* we get a spurious hint match below (i.e. a match not
* on one of the paths we're supposed to search first.
*/
realminor = -1;
cp = (char *)findshlib(name, &major, &realminor, 0);
if (cp && realminor >= minor)
return cp;
}
/* No LD_LIBRARY_PATH or lib not found in there; check default */
cp = findhint(name, major, minor, NULL);
if (cp)
return cp;
lose:
/* No hints available for name */
*usehints = 0;
realminor = -1;
add_search_path(hint_search_path);
cp = (char *)findshlib(name, &major, &realminor, 0);
remove_search_path(hint_search_path);
if (cp) {
if (realminor < minor && !ld_suppress_warnings)
warnx("warning: lib%s.so.%d.%d: "
"minor version >= %d expected, using it anyway",
name, major, realminor, minor);
return cp;
}
return NULL;
}
void
preload(paths)
char *paths;
{
struct so_map *nsmp;
struct sod *sodp;
char *cp, *dp;
dp = paths = strdup(paths);
if (dp == NULL) {
errx(1, "preload: out of memory");
}
while ((cp = strsep(&dp, ":")) != NULL) {
if ((sodp = (struct sod *)malloc(sizeof(struct sod))) == NULL) {
errx(1, "preload: %s: out of memory", cp);
return;
}
sodp->sod_name = (long)strdup(cp);
sodp->sod_library = 0;
sodp->sod_major = sodp->sod_minor = 0;
if ((nsmp = map_object(sodp, 0)) == NULL) {
errx(1, "preload: %s: cannot map object", cp);
}
LM_PRIVATE(nsmp)->spd_refcount++;
LM_PRIVATE(nsmp)->spd_flags |= _RTLD_GLOBAL;
}
free(paths);
return;
}
#if 0
static struct somap_private dlmap_private = {
0,
(struct so_map *)0,
0,
#ifdef SUN_COMPAT
0,
#endif
};
static struct so_map dlmap = {
(caddr_t)0,
"internal",
(struct so_map *)0,
(struct sod *)0,
(caddr_t)0,
(u_int)0,
(struct _dynamic *)0,
(caddr_t)&dlmap_private
};
#endif
static int dlerrno;
/*
* Populate sod struct for dlopen's call to map_object
*/
void
build_sod(name, sodp)
const char *name;
struct sod *sodp;
{
unsigned int tuplet;
int major, minor;
char *realname = NULL, *tok, *etok, *cp;
/* default is an absolute or relative path */
sodp->sod_name = (long)strdup(name); /* strtok is destructive */
sodp->sod_library = 0;
sodp->sod_major = sodp->sod_minor = 0;
/* asking for lookup? */
if (strncmp((char *)sodp->sod_name, "lib", 3) != 0)
return;
/* skip over 'lib' */
cp = (char *)sodp->sod_name + 3;
/* dot guardian */
if ((strchr(cp, '.') == NULL) || (*(cp+strlen(cp)-1) == '.'))
return;
/* default */
major = minor = -1;
/* loop through name - parse skipping name */
for (tuplet = 0; (tok = strsep(&cp, ".")) != NULL; tuplet++) {
switch (tuplet) {
case 0:
/* removed 'lib' and extensions from name */
realname = tok;
break;
case 1:
/* 'so' extension */
if (strcmp(tok, "so") != 0)
goto backout;
break;
case 2:
/* major version extension */
major = strtol(tok, &etok, 10);
if (*tok == '\0' || *etok != '\0')
goto backout;
break;
case 3:
/* minor version extension */
minor = strtol(tok, &etok, 10);
if (*tok == '\0' || *etok != '\0')
goto backout;
break;
/* if we get here, it must be weird */
default:
goto backout;
}
}
if (realname == NULL)
goto backout;
cp = (char *)sodp->sod_name;
sodp->sod_name = (long)strdup(realname);
free(cp);
sodp->sod_library = 1;
sodp->sod_major = major;
sodp->sod_minor = minor;
return;
backout:
free((char *)sodp->sod_name);
sodp->sod_name = (long)strdup(name);
}
static void *
__dlopen(name, mode)
const char *name;
int mode;
{
struct sod *sodp;
struct so_map *smp;
/*
* A NULL argument returns the current set of mapped objects.
*/
if (name == NULL) {
LM_PRIVATE(link_map_head)->spd_refcount++;
/* Return magic token */
return (void *)1;
}
if ((sodp = (struct sod *)malloc(sizeof(struct sod))) == NULL) {
dlerrno = ENOMEM;
return NULL;
}
build_sod(name, sodp);
if ((smp = map_object(sodp, main_map)) == NULL) {
#ifdef DEBUG
xprintf("%s: %s\n", name, strerror(errno));
#endif
dlerrno = errno;
free((char *)sodp->sod_name);
free(sodp);
return NULL;
}
if ((mode & RTLD_LOCAL) == 0)
LM_PRIVATE(smp)->spd_flags |= _RTLD_GLOBAL;
if (LM_PRIVATE(smp)->spd_refcount++ > 0) {
free((char *)sodp->sod_name);
free(sodp);
return smp;
}
LM_PRIVATE(smp)->spd_flags |= _RTLD_DL;
if (load_subs(smp) != 0) {
if (--LM_PRIVATE(smp)->spd_refcount == 0) {
unmap_object(smp);
free_link_map(smp);
}
return NULL;
}
init_maps(smp);
return smp;
}
static int
__dlclose(fd)
void *fd;
{
struct so_map *smp;
if (fd == (void *)1)
return 0;
smp = (struct so_map *)fd;
#ifdef DEBUG
xprintf("dlclose(%s): refcount = %d\n", smp->som_path, LM_PRIVATE(smp)->spd_refcount);
#endif
if (--LM_PRIVATE(smp)->spd_refcount != 0)
return 0;
if ((LM_PRIVATE(smp)->spd_flags & _RTLD_DL) == 0)
return 0;
/* Dismantle shared object map and descriptor */
call_map(smp, "__fini");
#if 0
unload_subs(smp); /* XXX should unload implied objects */
#endif
unmap_object(smp);
free_link_map(smp);
return 0;
}
static void *
__dlsym(fd, sym)
void *fd;
const char *sym;
{
struct so_map *smp, *src_map = NULL;
struct nzlist *np;
long addr;
/*
* Restrict search to passed map if dlopen()ed.
*/
if (fd == (void *)1)
smp = link_map_head;
else
src_map = smp = (struct so_map *)fd;
np = lookup(sym, smp, &src_map, 1);
if (np == NULL)
return NULL;
/* Fixup jmpslot so future calls transfer directly to target */
addr = np->nz_value;
if (src_map)
addr += (long)src_map->som_addr;
return (void *)addr;
}
static int
__dlctl(fd, cmd, arg)
void *fd;
int cmd;
void *arg;
{
switch (cmd) {
case DL_GETERRNO:
*(int *)arg = dlerrno;
dlerrno = 0;
return (0);
default:
dlerrno = EOPNOTSUPP;
return (-1);
}
return (-1);
}
static void
__dlexit()
{
struct so_map *smp;
/* Call any object initialization routines. */
for (smp = link_map_head; smp; smp = smp->som_next) {
if (LM_PRIVATE(smp)->spd_flags & _RTLD_RTLD)
continue;
call_map(smp, ".fini");
}
}
void
xprintf(char *fmt, ...)
{
char buf[256];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
(void)write(1, buf, strlen(buf));
va_end(ap);
}
Reference in New Issue View Git Blame Copy Permalink