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authorRoland McGrath <roland@gnu.org>2002-10-11 10:52:20 +0000
committerRoland McGrath <roland@gnu.org>2002-10-11 10:52:20 +0000
commitce460d04a5bd10d7353ca37dfa9d34275449fb3b (patch)
treee203d270a348ce6c5d0f4dbc54a430fbd106fd93 /elf
parent28654d2a063d22fda1fd748f392876ed61c36fa0 (diff)
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* sysdeps/generic/bits/libc-tsd.h [USE___THREAD]: Conditional
changed from [USE_TLS && HAVE___THREAD]. * sysdeps/i386/dl-machine.h (elf_machine_type_class, elf_machine_rel): Disable TLS relocs if [RTLD_BOOTSTRAP && !USE___THREAD]. * sysdeps/x86_64/dl-machine.h (elf_machine_type_class, elf_machine_rela): Likewise. * sysdeps/sh/dl-machine.h (elf_machine_type_class, elf_machine_rela): Likewise. * include/link.h (struct link_map): Remove member l_tls_tp_initialized. * elf/rtld.c (_dl_start_final, dl_main): Don't use it. (_dl_start): Conditionalize PT_TLS check on [USE___THREAD]. * sysdeps/i386/dl-tls.h (__TLS_GET_ADDR): Use ___tls_get_addr_internal instead of ___tls_get_addr. (___tls_get_addr_internal): Add attribute_hidden to decl. * sysdeps/generic/ldsodefs.h (struct rtld_global): New variable _dl_error_catch_tsd. * elf/rtld.c (startup_error_tsd): New function. (dl_main): Point _dl_error_catch_tsd at that. * elf/dl-error.c: Don't use libc-tsd.h for DL_ERROR, use new function pointer instead. * elf/dl-tsd.c: New file. * elf/Makefile (routines): Add it. 2002-10-07 Roland McGrath <roland@redhat.com> * elf/dl-misc.c (_dl_debug_vdprintf): Use INTERNAL_SYSCALL macro for writev if it's available. Otherwise if [RTLD_PRIVATE_ERRNO] then take _dl_load_lock around calling __writev. * sysdeps/unix/sysv/linux/i386/sysdep.h (INTERNAL_SYSCALL): New macro. (INLINE_SYSCALL): Use that. * sysdeps/generic/dl-sysdep.h: New file. * sysdeps/mach/hurd/dl-sysdep.h: New file. * sysdeps/generic/ldsodefs.h: Include <dl-sysdep.h>. * include/errno.h [IS_IN_rtld]: Include <dl-sysdep.h> to define ... [RTLD_PRIVATE_ERRNO]: Use a hidden global variable for errno and access it directly. * elf/dl-minimal.c (__errno_location): Removed. * sysdeps/unix/i386/sysdep.S (__syscall_errno) [RTLD_PRIVATE_ERRNO]: Use GOTOFF access for errno. * sysdeps/unix/sysv/linux/i386/sysdep.h [RTLD_PRIVATE_ERRNO] (SYSCALL_ERROR_HANDLER): Likewise. * sysdeps/unix/x86_64/sysdep.S (__syscall_errno) [RTLD_PRIVATE_ERRNO]: Use PC-relative access for errno. * sysdeps/unix/sysv/linux/x86_64/sysdep.h [RTLD_PRIVATE_ERRNO] (SYSCALL_ERROR_HANDLER): Likewise. * include/tls.h: New file. (USE___THREAD): New macro. Define to 1 under [USE_TLS && HAVE___THREAD] and only when compiling libc or libpthread. * sysdeps/unix/sysv/linux/i386/sysdep.h [USE___THREAD]: Conditional changed from [USE_TLS && HAVE___THREAD]. * sysdeps/unix/sysv/linux/x86_64/sysdep.h: Likewise. * sysdeps/unix/i386/sysdep.S: Likewise. * sysdeps/unix/x86_64/sysdep.S: Likewise. * include/errno.h: Likewise. * include/netdb.h: Likewise. * include/resolv.h: Likewise. * sysdeps/generic/errno.c: New file. * csu/Makefile (aux): New variable, list errno. * sysdeps/unix/sysv/linux/i386/sysdep.S (errno, _errno): Remove defns. * sysdeps/unix/sysv/linux/m68k/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/arm/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/cris/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/hppa/sysdep.c: Likewise. * sysdeps/unix/sysv/linux/ia64/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/powerpc/sysdep.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/sh/sysdep.S: Likewise. * sysdeps/unix/alpha/sysdep.S: Likewise. * sysdeps/generic/start.c: Likewise. * sysdeps/unix/start.c: Likewise. * sysdeps/unix/arm/start.c: Likewise. * sysdeps/unix/bsd/ultrix4/mips/start.S: Likewise. * sysdeps/unix/sparc/start.c: Likewise. * sysdeps/unix/sysv/irix4/start.c: Likewise. * sysdeps/unix/sysv/linux/mips/sysdep.S: File removed. * manual/search.texi (Tree Search Function, Hash Search Function): Mention search.h clearly. 2002-10-05 Roland McGrath <roland@redhat.com> * elf/dl-fxstat64.c: File removed. * elf/dl-xstat64.c: File removed. * elf/Makefile (rtld-routines): Remove them. * sysdeps/unix/sysv/linux/xstat64.c: Remove RTLD_STAT64 conditionals. Instead, use strong_alias instead of versioned_symbol in the !SHLIB_COMPAT case. * sysdeps/unix/sysv/linux/fxstat64.c: Likewise. * sysdeps/unix/sysv/linux/lxstat64.c: Likewise. * include/shlib-compat.h (SHLIB_COMPAT): Require that IS_IN_##lib be defined nonzero. [! NOT_IN_libc] (IS_IN_libc): Define it. * cppflags-iterator.mk (CPPFLAGS-$(cpp-src)): Use -Dx=1 not just -Dx. * elf/Makefile (CPPFLAGS-.os): Likewise. * sunrpc/rpc_main.c (main): Don't declare with noreturn attribute. Return the status instead of calling exit. * Makeconfig (CFLAGS): Prepend -std=gnu99. * Makerules (+make-deps): Use $(CFLAGS) only for .c sources. Remove superfluous rm command, whose @ plus make bugs hid all these commands from the make output. * include/stubs-prologue.h: New file. Give #error under #ifdef _LIBC. * Makefile ($(inst_includedir)/gnu/stubs.h): Depend on it. Use that file's contents instead of literal echo's for the prologue. * include/features.h: Include <gnu/stubs.h> unconditionally. * include/gnu/stubs.h: New file. 2002-09-30 Roland McGrath <roland@redhat.com> * elf/rtld-Rules: New file. * elf/Makefile ($(objpfx)librtld.map, $(objpfx)librtld.mk, $(objpfx)rtld-libc.a): New targets. (generated): Add them. (reloc-link): Remove -o $@ from the variable. ($(objpfx)dl-allobjs.os): Add -o $@ after $(reloc-link). (distribute): Add rtld-Rules. (CPPFLAGS-.os): Define this instead of CFLAGS-.os. * Makerules ($(+sysdir_pfx)sysd-rules): Emit rules for rtld-% targets. (common-mostlyclean, common-clean): Clean up rtld-* files. * sysdeps/unix/make-syscalls.sh: Add rtld-*.os target name to rules.
Diffstat (limited to 'elf')
-rw-r--r--elf/Makefile54
-rw-r--r--elf/dl-error.c26
-rw-r--r--elf/dl-fxstat64.c25
-rw-r--r--elf/dl-minimal.c16
-rw-r--r--elf/dl-misc.c11
-rw-r--r--elf/dl-tsd.c54
-rw-r--r--elf/dl-xstat64.c25
-rw-r--r--elf/rtld-Rules115
-rw-r--r--elf/rtld.c83
9 files changed, 273 insertions, 136 deletions
diff --git a/elf/Makefile b/elf/Makefile
index 5470728..5fdcec4 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -23,7 +23,7 @@ subdir := elf
headers = elf.h bits/elfclass.h link.h
routines = $(dl-routines) dl-open dl-close dl-support dl-iteratephdr \
dl-iteratephdr-static dl-addr enbl-secure dl-profstub \
- dl-origin dl-libc dl-sym
+ dl-origin dl-libc dl-sym dl-tsd
# The core dynamic linking functions are in libc for the static and
# profiled libraries.
@@ -37,11 +37,11 @@ elide-routines.os = $(all-dl-routines) dl-support enbl-secure \
# ld.so uses those routines, plus some special stuff for being the program
# interpreter and operating independent of libc.
-rtld-routines := rtld $(dl-routines) dl-sysdep dl-environ dl-minimal \
- dl-xstat64 dl-fxstat64
+rtld-routines := rtld $(dl-routines) dl-sysdep dl-environ dl-minimal
all-rtld-routines = $(rtld-routines) $(sysdep-rtld-routines)
-distribute := $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
+distribute := rtld-Rules \
+ $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
dl-cache.h dl-hash.h soinit.c sofini.c ldd.bash.in \
genrtldtbl.awk atomicity.h dl-procinfo.h ldsodefs.h \
dl-librecon.h interp.c sln.c dl-dst.h hp-timing.h \
@@ -166,14 +166,49 @@ lib-noranlib: $(objpfx)$(rtld-installed-name) \
endif
# Command to link into a larger single relocatable object.
-reloc-link = $(LINK.o) -nostdlib -nostartfiles -r -o $@
+reloc-link = $(LINK.o) -nostdlib -nostartfiles -r
$(objpfx)dl-allobjs.os: $(all-rtld-routines:%=$(objpfx)%.os)
- $(reloc-link) $^
+ $(reloc-link) -o $@ $^
# Link together the dynamic linker into a single relocatable object.
-$(objpfx)librtld.os: $(objpfx)dl-allobjs.os $(common-objpfx)libc_pic.a
- $(reloc-link) '-Wl,-(' $^ -lgcc '-Wl,-)'
+# First we do a link against libc_pic.a just to get a link map,
+# and discard the object produced by that link. From the link map
+# we can glean all the libc modules that need to go into the dynamic
+# linker. Then we do a recursive make that goes into all the subdirs
+# those modules come from and builds special rtld-foo.os versions that
+# are compiled with special flags, and puts these modules into rtld-libc.a
+# for us. Then we do the real link using rtld-libc.a instead of libc_pic.a.
+
+$(objpfx)librtld.map: $(objpfx)dl-allobjs.os $(common-objpfx)libc_pic.a
+ $(reloc-link) -o $@.o '-Wl,-(' $^ -lgcc '-Wl,-)' -Wl,-Map,$@
+ rm -f $@.o
+
+$(objpfx)librtld.mk: $(objpfx)librtld.map Makefile
+ sed -n 's@^$(common-objpfx)\([^(]*\)(\(.*.os\))$$@\1 \2@p' $< | \
+ while read lib file; do \
+ case $$lib in \
+ libc_pic.a) \
+ fgrep -l /$$file \
+ $(common-objpfx)stamp.os $(common-objpfx)*/stamp.os | \
+ sed 's@^$(common-objpfx)\([^/]*\)/stamp\.os$$@rtld-\1'" +=$$file@"\
+ ;; \
+ */*.a) \
+ echo rtld-$${lib%%/*} += $$file ;; \
+ *) echo "Wasn't expecting $$lib($$file)" >&2; exit 1 ;; \
+ esac; \
+ done > $@T
+ echo rtld-subdirs = `sed 's/^rtld-\([^ ]*\).*$$/\1/' $@T \
+ | sort -u` >> $@T
+ mv -f $@T $@
+
+$(objpfx)rtld-libc.a: $(objpfx)librtld.mk FORCE
+ $(MAKE) -f $< -f rtld-Rules
+
+generated += librtld.map librtld.mk rtld-libc.a
+
+$(objpfx)librtld.os: $(objpfx)dl-allobjs.os $(objpfx)rtld-libc.a
+ $(LINK.o) -nostdlib -nostartfiles -r -o $@ '-Wl,-(' $^ -lgcc '-Wl,-)'
$(objpfx)ld.so: $(objpfx)librtld.os $(ld-map)
@rm -f $@.lds
@@ -209,6 +244,7 @@ $(objpfx)trusted-dirs.st: Makefile $(..)Makeconfig
$(make-target-directory)
echo "$(subst :, ,$(default-rpath) $(user-defined-trusted-dirs))" \
| $(AWK) -f gen-trusted-dirs.awk > ${@:st=T};
+ echo '#define DL_DST_LIB "$(notdir $(slibdir))"' >> ${@:st=T}
$(move-if-change) ${@:st=T} ${@:st=h}
touch $@
CPPFLAGS-dl-load.c = -I$(objpfx). -I$(csu-objpfx).
@@ -265,7 +301,7 @@ CFLAGS-ldconfig.c = $(SYSCONF-FLAGS) -D'LIBDIR="$(libdir)"' -D'SLIBDIR="$(slibdi
CFLAGS-dl-cache.c = $(SYSCONF-FLAGS)
CFLAGS-cache.c = $(SYSCONF-FLAGS)
-CFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),-DNOT_IN_libc -DIS_IN_rtld)
+CPPFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),-DNOT_IN_libc=1 -DIS_IN_rtld=1)
test-modules = $(addprefix $(objpfx),$(addsuffix .so,$(strip $(modules-names))))
generated += $(addsuffix .so,$(strip $(modules-names)))
diff --git a/elf/dl-error.c b/elf/dl-error.c
index 0af8f2f..e8f2f3e 100644
--- a/elf/dl-error.c
+++ b/elf/dl-error.c
@@ -23,7 +23,6 @@
#include <string.h>
#include <unistd.h>
#include <ldsodefs.h>
-#include <bits/libc-tsd.h>
/* This structure communicates state between _dl_catch_error and
_dl_signal_error. */
@@ -38,11 +37,8 @@ struct catch
calls can come from `_dl_map_object_deps', `_dlerror_run', or from
any of the libc functionality which loads dynamic objects (NSS, iconv).
Therefore we have to be prepared to save the state in thread-local
- memory. */
-
-__libc_tsd_define (static, DL_ERROR)
-#define tsd_getspecific() __libc_tsd_get (DL_ERROR)
-#define tsd_setspecific(data) __libc_tsd_set (DL_ERROR, (data))
+ memory. The _dl_error_catch_tsd function pointer is reset by the thread
+ library so that it returns the address of a thread-local variable. */
/* This message we return as a last resort. We define the string in a
@@ -72,7 +68,7 @@ _dl_signal_error (int errcode, const char *objname, const char *occation,
if (! errstring)
errstring = N_("DYNAMIC LINKER BUG!!!");
- lcatch = tsd_getspecific ();
+ lcatch = *((*GL(dl_error_catch_tsd)) ());
if (objname == NULL)
objname = "";
if (lcatch != NULL)
@@ -151,20 +147,21 @@ _dl_catch_error (const char **objname, const char **errstring,
inefficient. So we initialize `c' by hand. */
c.errstring = NULL;
- old = tsd_getspecific ();
+ void **catchp = (*GL(dl_error_catch_tsd)) ();
+ old = *catchp;
errcode = setjmp (c.env);
if (__builtin_expect (errcode, 0) == 0)
{
- tsd_setspecific (&c);
+ *catchp = &c;
(*operate) (args);
- tsd_setspecific (old);
+ *catchp = old;
*objname = NULL;
*errstring = NULL;
return 0;
}
/* We get here only if we longjmp'd out of OPERATE. */
- tsd_setspecific (old);
+ *catchp = old;
*objname = c.objname;
*errstring = c.errstring;
return errcode == -1 ? 0 : errcode;
@@ -176,18 +173,19 @@ void
internal_function
_dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args)
{
+ void **catchp = (*GL(dl_error_catch_tsd)) ();
struct catch *old_catch;
receiver_fct old_receiver;
- old_catch = tsd_getspecific ();
+ old_catch = *catchp;
old_receiver = receiver;
/* Set the new values. */
- tsd_setspecific (NULL);
+ *catchp = NULL;
receiver = fct;
(*operate) (args);
- tsd_setspecific (old_catch);
+ *catchp = old_catch;
receiver = old_receiver;
}
diff --git a/elf/dl-fxstat64.c b/elf/dl-fxstat64.c
deleted file mode 100644
index 38d445d..0000000
--- a/elf/dl-fxstat64.c
+++ /dev/null
@@ -1,25 +0,0 @@
-/* Dynamic linker's private version of __fxstat64.
- Copyright (C) 2002 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-/* This special file is needed because some fxstat64.c implementations
- use versioning for __fxstat64 and we need to keep it local to
- the dynamic linker. */
-
-#define RTLD_STAT64
-#include <fxstat64.c>
diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
index f4b7e28..d1619cf 100644
--- a/elf/dl-minimal.c
+++ b/elf/dl-minimal.c
@@ -353,19 +353,3 @@ strong_alias (__strsep, __strsep_g)
up to 36. We don't need this here. */
const char INTUSE(_itoa_lower_digits)[16] attribute_hidden
= "0123456789abcdef";
-
-
-
-#undef errno
-/* The 'errno' in ld.so is not exported. */
-#if USE_TLS && HAVE___THREAD
-extern __thread int errno attribute_hidden;
-#else
-extern int errno attribute_hidden;
-
-int *
-__errno_location (void)
-{
- return &errno;
-}
-#endif
diff --git a/elf/dl-misc.c b/elf/dl-misc.c
index 2d42230..f804724 100644
--- a/elf/dl-misc.c
+++ b/elf/dl-misc.c
@@ -31,6 +31,7 @@
#include <sys/stat.h>
#include <sys/uio.h>
#include <stdio-common/_itoa.h>
+#include <bits/libc-lock.h>
#ifndef MAP_ANON
/* This is the only dl-sysdep.c function that is actually needed at run-time
@@ -245,7 +246,17 @@ _dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg)
}
/* Finally write the result. */
+#ifdef INTERNAL_SYSCALL
+ INTERNAL_SYSCALL (writev, 3, fd, iov, niov);
+#elif RTLD_PRIVATE_ERRNO
+ /* We have to take this lock just to be sure we don't clobber the private
+ errno when it's being used by another thread that cares about it. */
+ __libc_lock_lock_recursive (GL(dl_load_lock));
__writev (fd, iov, niov);
+ __libc_lock_unlock_recursive (GL(dl_load_lock));
+#else
+ __writev (fd, iov, niov);
+#endif
}
diff --git a/elf/dl-tsd.c b/elf/dl-tsd.c
new file mode 100644
index 0000000..aa290a7
--- /dev/null
+++ b/elf/dl-tsd.c
@@ -0,0 +1,54 @@
+/* Thread-local data used by error handling for runtime dynamic linker.
+ Copyright (C) 2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <ldsodefs.h>
+#include <tls.h>
+
+#ifndef SHARED
+
+/* _dl_error_catch_tsd points to this for the single-threaded case.
+ It's reset by the thread library for multithreaded programs
+ if we're not using __thread. */
+static void ** __attribute__ ((const))
+startup_error_tsd (void)
+{
+#if USE___THREAD
+ static __thread void *data;
+#else
+ static void *data;
+#endif
+ return &data;
+}
+void **(*_dl_error_catch_tsd) (void) __attribute__ ((const))
+ = &startup_error_tsd;
+
+#elif USE___THREAD
+
+/* libpthread sets _dl_error_catch_tsd to point to this function.
+ We define it here instead of in libpthread so that it doesn't
+ need to have a TLS segment of its own just for this one pointer. */
+
+void ** __attribute__ ((const))
+__libc_dl_error_tsd (void)
+{
+ static __thread void *data;
+ return &data;
+}
+
+#endif
diff --git a/elf/dl-xstat64.c b/elf/dl-xstat64.c
deleted file mode 100644
index 4484f99..0000000
--- a/elf/dl-xstat64.c
+++ /dev/null
@@ -1,25 +0,0 @@
-/* Dynamic linker's private version of __xstat64.
- Copyright (C) 2002 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-/* This special file is needed because some xstat64.c implementations
- use versioning for __xstat64 and we need to keep it local to
- the dynamic linker. */
-
-#define RTLD_STAT64
-#include <xstat64.c>
diff --git a/elf/rtld-Rules b/elf/rtld-Rules
new file mode 100644
index 0000000..03fe25d
--- /dev/null
+++ b/elf/rtld-Rules
@@ -0,0 +1,115 @@
+# Subroutine makefile for compiling libc modules linked into dynamic linker.
+
+# Copyright (C) 2002 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, write to the Free
+# Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+# 02111-1307 USA.
+
+# This makefile is never used by itself, but only from the rtld-libc.a
+# rule in Makefile, which does make -f librtld.mk -f rtld-Rules.
+# librtld.mk is the generated file containing variable definitions for
+# `rtld-subdirs', a subset of the top-level $(subdirs) list; and for each
+# SUBDIR in $(rtld-subdirs), `rtld-SUBDIR' listing `module.os' file names.
+
+.PHONY: rtld-all
+rtld-all:
+
+# When run from the elf/Makefile to build rtld-libc.a, $(subdir) is elf.
+ifeq ($(subdir),elf)
+
+ifndef rtld-subdirs
+error This is makefile is a subroutine of elf/Makefile not to be used directly
+endif
+
+include ../Makeconfig
+
+rtld-all: $(objpfx)rtld-libc.a
+
+$(objpfx)rtld-libc.a: $(foreach dir,$(rtld-subdirs),\
+ $(addprefix $(common-objpfx)$(dir)/rtld-,\
+ $(rtld-$(dir))))
+ @-rm -f $@T
+ $(AR) cq $@T $^
+ $(RANLIB) $@T
+ mv -f $@T $@
+
+# For each subdirectory, define a pattern rule that makes all of that
+# subdirectory's modules at once with one recursive make command.
+object-suffixes-left := $(rtld-subdirs)
+define o-iterator-doit
+$(foreach obj,$(rtld-$o),$(common-objpfx)%/rtld-$(obj)): FORCE ; \
+ +$$(rtld-subdir-make)
+endef
+include $(patsubst %,../o-iterator.mk,$(object-suffixes-left))
+
+# This is how we descend into each subdirectory. See below.
+define rtld-subdir-make
+$(MAKE) -C ../$* objdir=$(objdir) -f Makefile -f ../elf/rtld-Rules rtld-all \
+ rtld-modules='$(addprefix rtld-,$(rtld-$*))'
+endef
+
+FORCE:
+
+else
+
+# In this case we are being run by $(rtld-subdir-make), above.
+# Some other subdir's Makefile has provided all its normal rules,
+# and we just provide some additional definitions.
+
+# These are the basic compilation rules corresponding to the Makerules ones.
+# The sysd-rules generated makefile already defines pattern rules for rtld-%
+# targets built from sysdeps source files.
+$(objpfx)rtld-%.os: %.S $(before-compile); $(compile-command.S)
+$(objpfx)rtld-%.d: %.S $(before-compile); $(+make-deps)
+$(objpfx)rtld-%.os: %.s $(before-compile); $(compile-command.s)
+$(objpfx)rtld-%.d: %.s $(before-compile); $(+make-deps)
+$(objpfx)rtld-%.os: %.c $(before-compile); $(compile-command.c)
+$(objpfx)rtld-%.d: %.c $(before-compile); $(+make-deps)
+
+# The rules for generated source files.
+$(objpfx)rtld-%.os: $(objpfx)%.S $(before-compile); $(compile-command.S)
+$(objpfx)rtld-%.d: $(objpfx)%.S $(before-compile); $(+make-deps)
+$(objpfx)rtld-%.os: $(objpfx)%.s $(before-compile); $(compile-command.s)
+$(objpfx)rtld-%.d: $(objpfx)%.s $(before-compile); $(+make-deps)
+$(objpfx)rtld-%.os: $(objpfx)%.c $(before-compile); $(compile-command.c)
+$(objpfx)rtld-%.d: $(objpfx)%.c $(before-compile); $(+make-deps)
+
+# The command line setting of rtld-modules (see above) tells us
+# what we need to build, and that tells us what dependency files we need.
+rtld-all: $(addprefix $(objpfx),$(rtld-modules))
+
+# Figure out the dependency files we need. After respecting the $(omit-deps)
+# list as applied to the names without the `rtld-', there may be none left.
+rtld-depfiles := $(patsubst %,$(objpfx)rtld-%.d,\
+ $(filter-out $(omit-deps),\
+ $(rtld-modules:rtld-%.os=%)))
+ifdef rtld-depfiles
+-include $(rtld-depfiles)
+endif
+
+# Just in case we wind up e.g. regenerating dependencies for non-rtld objects,
+# we don't unconditionally modify the flags. For rtld-% targets, use the
+# special flags set below.
+CFLAGS += $(if $(filter rtld-%,$(@F)),$(CFLAGS-rtld))
+CPPFLAGS += $(if $(filter rtld-%,$(@F)),$(CPPFLAGS-rtld))
+
+
+# This here is the whole point of all the shenanigans.
+CPPFLAGS-rtld := -DNOT_IN_libc=1 -DIS_IN_rtld=1
+CFLAGS-rtld := # blah
+
+
+endif
diff --git a/elf/rtld.c b/elf/rtld.c
index 1960064..3a64ca7 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -221,21 +221,18 @@ _dl_start_final (void *arg, struct dl_start_final_info *info)
GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end;
/* Copy the TLS related data if necessary. */
#if USE_TLS && !defined DONT_USE_BOOTSTRAP_MAP
-# ifdef HAVE___THREAD
+# if USE___THREAD
assert (info->l.l_tls_modid != 0);
+ GL(dl_rtld_map).l_tls_blocksize = info->l.l_tls_blocksize;
+ GL(dl_rtld_map).l_tls_align = info->l.l_tls_align;
+ GL(dl_rtld_map).l_tls_initimage_size = info->l.l_tls_initimage_size;
+ GL(dl_rtld_map).l_tls_initimage = info->l.l_tls_initimage;
+ GL(dl_rtld_map).l_tls_offset = info->l.l_tls_offset;
+ GL(dl_rtld_map).l_tls_modid = 1;
# else
- if (info->l.l_tls_modid != 0)
+ assert (info->l.l_tls_modid == 0);
# endif
- {
- GL(dl_rtld_map).l_tls_blocksize = info->l.l_tls_blocksize;
- GL(dl_rtld_map).l_tls_align = info->l.l_tls_align;
- GL(dl_rtld_map).l_tls_initimage_size = info->l.l_tls_initimage_size;
- GL(dl_rtld_map).l_tls_initimage = info->l.l_tls_initimage;
- GL(dl_rtld_map).l_tls_offset = info->l.l_tls_offset;
- GL(dl_rtld_map).l_tls_modid = 1;
- GL(dl_rtld_map).l_tls_tp_initialized
- = info->l.l_tls_tp_initialized;
- }
+
#endif
#if HP_TIMING_AVAIL
@@ -276,14 +273,6 @@ _dl_start (void *arg)
struct dl_start_final_info info;
# define bootstrap_map info.l
#endif
-#if USE_TLS || (!DONT_USE_BOOTSTRAP_MAP && !HAVE_BUILTIN_MEMSET)
- size_t cnt;
-#endif
-#ifdef USE_TLS
- ElfW(Ehdr) *ehdr;
- ElfW(Phdr) *phdr;
- dtv_t initdtv[3];
-#endif
/* This #define produces dynamic linking inline functions for
bootstrap relocation instead of general-purpose relocation. */
@@ -311,7 +300,7 @@ _dl_start (void *arg)
# ifdef HAVE_BUILTIN_MEMSET
__builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info));
# else
- for (cnt = 0;
+ for (size_t cnt = 0;
cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]);
++cnt)
bootstrap_map.l_info[cnt] = 0;
@@ -325,24 +314,21 @@ _dl_start (void *arg)
bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic ();
elf_get_dynamic_info (&bootstrap_map);
-#if USE_TLS
-# if !defined HAVE___THREAD && !defined DONT_USE_BOOTSTRAP_MAP
- /* Signal that we have not found TLS data so far. */
- bootstrap_map.l_tls_modid = 0;
-# endif
-
+#if USE___THREAD
/* Get the dynamic linker's own program header. First we need the ELF
file header. The `_begin' symbol created by the linker script points
to it. When we have something like GOTOFF relocs, we can use a plain
reference to find the runtime address. Without that, we have to rely
on the `l_addr' value, which is not the value we want when prelinked. */
-#ifdef DONT_USE_BOOTSTRAP_MAP
- ehdr = (ElfW(Ehdr) *) &_begin;
-#else
- ehdr = (ElfW(Ehdr) *) bootstrap_map.l_addr;
-#endif
- phdr = (ElfW(Phdr) *) ((ElfW(Addr)) ehdr + ehdr->e_phoff);
- for (cnt = 0; cnt < ehdr->e_phnum; ++cnt)
+ ElfW(Ehdr) *ehdr
+# ifdef DONT_USE_BOOTSTRAP_MAP
+ = (ElfW(Ehdr) *) &_begin;
+# else
+ = (ElfW(Ehdr) *) bootstrap_map.l_addr;
+# endif
+ ElfW(Phdr) *phdr = (ElfW(Phdr) *) ((void *) ehdr + ehdr->e_phoff);
+ size_t cnt = ehdr->e_phnum; /* PT_TLS is usually the last phdr. */
+ while (cnt-- > 0)
if (phdr[cnt].p_type == PT_TLS)
{
void *tlsblock;
@@ -431,13 +417,11 @@ _dl_start (void *arg)
/* So far this is module number one. */
bootstrap_map.l_tls_modid = 1;
- /* The TP got initialized. */
- bootstrap_map.l_tls_tp_initialized = 1;
/* There can only be one PT_TLS entry. */
break;
}
-#endif /* use TLS */
+#endif /* USE___THREAD */
#ifdef ELF_MACHINE_BEFORE_RTLD_RELOC
ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info);
@@ -576,6 +560,15 @@ match_version (const char *string, struct link_map *map)
return 0;
}
+/* _dl_error_catch_tsd points to this for the single-threaded case.
+ It's reset by the thread library for multithreaded programs. */
+static void ** __attribute__ ((const))
+startup_error_tsd (void)
+{
+ static void *data;
+ return &data;
+}
+
static const char *library_path; /* The library search path. */
static const char *preloadlist; /* The list preloaded objects. */
static int version_info; /* Nonzero if information about
@@ -605,6 +598,9 @@ dl_main (const ElfW(Phdr) *phdr,
void *tcbp;
#endif
+ /* Explicit initialization since the reloc would just be more work. */
+ GL(dl_error_catch_tsd) = &startup_error_tsd;
+
/* Process the environment variable which control the behaviour. */
process_envvars (&mode);
@@ -1564,16 +1560,9 @@ cannot allocate TLS data structures for initial thread");
into the main thread's TLS area, which we allocated above. */
_dl_allocate_tls_init (tcbp);
- /* And finally install it for the main thread. */
-# ifndef HAVE___THREAD
- TLS_INIT_TP (tcbp, GL(dl_rtld_map).l_tls_tp_initialized);
-# else
- /* If the compiler supports the __thread keyword we know that
- at least ld.so itself uses TLS and therefore the thread
- pointer was initialized earlier. */
- assert (GL(dl_rtld_map).l_tls_tp_initialized != 0);
- TLS_INIT_TP (tcbp, 1);
-# endif
+ /* And finally install it for the main thread. If ld.so itself uses
+ TLS we know the thread pointer was initialized earlier. */
+ TLS_INIT_TP (tcbp, USE___THREAD);
}
#endif