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Tue Nov 7 12:29:46 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

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* elf/linux-compat.c: New file.
	* elf/Makefile (distribute): Add linux-compat.c.
	(generated): Add librtld.so.
	[$(config-os)=linux*] (extra-objs): Add linux-compat.so.
	[$(config-os)=linux*] (extra-objs): Add ld-linux.so.1.
	(librtld.so): New target.
	(ld.so, ld-linux.so.1): Make from librtld.so.

	* elf/rtld.c (dl_main): Instead of weak call to _dl_compat_init,
	call our own DT_INIT if we have one (and then clear it).
	(__dgettext): New weak function.

	* intl/localealias.c (read_alias_file): Avoid sprintf; use memcpy
	by hand instead.

	* sysdeps/generic/_strerror.c (_strerror_internal): Use _itoa
	instead of snprintf.

	* sysdeps/mach/_strerror.c (_strerror_internal): Don't write
	BUF[BUFLEN].

	* elf/rtld.c (rtld_map): New static variable.
	(_dl_start): Use a differently named local BOOTSTRAP_MAP for the
	bootstrapping.  Then copy data into `rtld_map'.
	(dl_main): Finish filling in rtld_map and link it into the chain,
	instead of allocating a new structure.
	(dl_main): Call _dl_compat_init if it is defined (use weak ref).

	* elf/dlsym.c: Fix last change: move REF out of `doit'.


	control.
	using it.

	and cwdir ports.
	functions.
	these.
	$(libdir)(rtld-installed-name).

	leading zeroes.

	in the rhs.
	pattern rule.


	never know.
	(fork): Use symbol_set_* macros for _hurd_fork_locks.
	* sysdeps/unix/sysv/sysv4/linux/i386/sysdep.S (__syscall_error):
 	instead of unix/sysv.

	-dynamic-linker.

	(__printf_fp): Last arg ARGS is now `const void **const';

	locale/C-ctype.c.
	* sysdeps/mach/hurd/sigsuspend.c: Likewise.
	* sysdeps/mach/hurd/mips/sigreturn.c: Likewise.
	alias gethostname.
	setitmr
	setpgrp
	(_S_msg_get_exec_flags, _S_msg_set_exec_flags,
	(abort_thread, abort_rpcs): Take same new arg and pass it through.
This commit is contained in:
Roland McGrath
1995-11-07 21:46:52 +00:00
parent 51093422b2
commit 86d2c878ac
8 changed files with 199 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

76
elf/rtld.c
View File

@ -50,22 +50,24 @@ static void dl_main (const Elf32_Phdr *phdr,
Elf32_Word phent,
Elf32_Addr *user_entry);
static struct link_map rtld_map;
Elf32_Addr
_dl_start (void *arg)
{
struct link_map rtld_map;
struct link_map bootstrap_map;
/* Figure out the run-time load address of the dynamic linker itself. */
rtld_map.l_addr = elf_machine_load_address ();
bootstrap_map.l_addr = elf_machine_load_address ();
/* Read our own dynamic section and fill in the info array.
Conveniently, the first element of the GOT contains the
offset of _DYNAMIC relative to the run-time load address. */
rtld_map.l_ld = (void *) rtld_map.l_addr + *elf_machine_got ();
elf_get_dynamic_info (rtld_map.l_ld, rtld_map.l_info);
bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + *elf_machine_got ();
elf_get_dynamic_info (bootstrap_map.l_ld, bootstrap_map.l_info);
#ifdef ELF_MACHINE_BEFORE_RTLD_RELOC
ELF_MACHINE_BEFORE_RTLD_RELOC (rtld_map.l_info);
ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info);
#endif
/* Relocate ourselves so we can do normal function calls and
@ -77,8 +79,8 @@ _dl_start (void *arg)
bootstrapping, so it must anti-perform each bootstrapping relocation
before applying the final relocation when ld.so is linked in as
normal a shared library. */
rtld_map.l_type = lt_library;
ELF_DYNAMIC_RELOCATE (&rtld_map, 0, NULL);
bootstrap_map.l_type = lt_library;
ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, NULL);
/* Now life is sane; we can call functions and access global data.
@ -86,7 +88,12 @@ _dl_start (void *arg)
the operating system's program loader where to find the program
header table in core. */
dl_r_debug.r_ldbase = rtld_map.l_addr; /* Record our load address. */
/* Transfer data about ourselves to the permanent link_map structure. */
rtld_map.l_addr = bootstrap_map.l_addr;
rtld_map.l_ld = bootstrap_map.l_ld;
memcpy (rtld_map.l_info, bootstrap_map.l_info, sizeof rtld_map.l_info);
/* Call the OS-dependent function to set up life so we can do things like
file access. It will call `dl_main' (below) to do all the real work
@ -122,9 +129,9 @@ dl_main (const Elf32_Phdr *phdr,
itself! This means someone ran ld.so as a command. Well, that
might be convenient to do sometimes. We support it by
interpreting the args like this:
ld.so PROGRAM ARGS...
The first argument is the name of a file containing an ELF
executable we will load and run with the following arguments.
To simplify life here, PROGRAM is searched for using the
@ -228,8 +235,14 @@ of this helper program; chances are you did not intend to run this program.\n",
will set up later to communicate with the debugger. */
l->l_info[DT_DEBUG]->d_un.d_ptr = (Elf32_Addr) &dl_r_debug;
l = _dl_new_object ((char *) interpreter_name, interpreter_name,
lt_interpreter);
/* Put the link_map for ourselves on the chain so it can be found by
name. */
rtld_map.l_name = (char *) rtld_map.l_libname = interpreter_name;
rtld_map.l_type = lt_interpreter;
while (l->l_next)
l = l->l_next;
l->l_next = &rtld_map;
rtld_map.l_prev = l;
/* Now process all the DT_NEEDED entries and map in the objects.
Each new link_map will go on the end of the chain, so we will
@ -248,16 +261,13 @@ of this helper program; chances are you did not intend to run this program.\n",
l->l_deps_loaded = 1;
}
l = _dl_loaded->l_next;
while (l->l_type != lt_interpreter)
l = l->l_next;
if (l->l_opencount == 0)
if (rtld_map.l_opencount == 0)
{
/* No DT_NEEDED entry referred to the interpreter object itself.
Remove it from the maps we will use for symbol resolution. */
l->l_prev->l_next = l->l_next;
if (l->l_next)
l->l_next->l_prev = l->l_prev;
rtld_map.l_prev->l_next = rtld_map.l_next;
if (rtld_map.l_next)
rtld_map.l_next->l_prev = rtld_map.l_prev;
}
lazy = !_dl_secure && *(getenv ("LD_BIND_NOW") ?: "") == '\0';
@ -276,6 +286,7 @@ of this helper program; chances are you did not intend to run this program.\n",
/* Tell the debugger where to find the map of loaded objects. */
dl_r_debug.r_version = 1 /* R_DEBUG_VERSION XXX */;
dl_r_debug.r_ldbase = rtld_map.l_addr; /* Record our load address. */
dl_r_debug.r_map = _dl_loaded;
dl_r_debug.r_brk = (Elf32_Addr) &_dl_r_debug_state;
@ -301,6 +312,19 @@ of this helper program; chances are you did not intend to run this program.\n",
_exit (0);
}
if (rtld_map.l_info[DT_INIT])
{
/* Call the initializer for the compatibility version of the
dynamic linker. There is no additional initialization
required for the ABI-compliant dynamic linker. */
(*(void (*) (void)) (rtld_map.l_addr +
rtld_map.l_info[DT_INIT]->d_un.d_ptr)) ();
/* Clear the field so a future dlopen won't run it again. */
rtld_map.l_info[DT_INIT] = NULL;
}
}
const char *errstring;
const char *errobj;
@ -318,13 +342,25 @@ of this helper program; chances are you did not intend to run this program.\n",
the DT_INIT functions and then *USER_ENTRY. */
}
/* This function exists solely to have a breakpoint set on it by the
/* This function exists solely to have a breakpoint set on it by the
debugger. */
void
_dl_r_debug_state (void)
{
}
/* Define our own stub for the localization function used by strerror.
English-only in the dynamic linker keeps it smaller. */
char *
__dgettext (const char *domainname, const char *msgid)
{
assert (domainname == _libc_intl_domainname);
return (char *) msgid;
}
weak_symbol (__dgettext)
weak_alias (__dgettext, dgettext)
#ifndef NDEBUG
/* Define (weakly) our own assert failure function which doesn't use stdio.