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4 Commits

Author SHA1 Message Date
Florian Weimer
ee1ada1bdb elf: Rework exception handling in the dynamic loader [BZ #25486] 
The old exception handling implementation used function interposition
to replace the dynamic loader implementation (no TLS support) with the
libc implementation (TLS support).  This results in problems if the
link order between the dynamic loader and libc is reversed (bug 25486).

The new implementation moves the entire implementation of the
exception handling functions back into the dynamic loader, using
THREAD_GETMEM and THREAD_SETMEM for thread-local data support.
These depends on Hurd support for these macros, added in commit
b65a82e4e7 ("hurd: Add THREAD_GET/SETMEM/_NC").

One small obstacle is that the exception handling facilities are used
before the TCB has been set up, so a check is needed if the TCB is
available.  If not, a regular global variable is used to store the
exception handling information.

Also rename dl-error.c to dl-catch.c, to avoid confusion with the
dlerror function.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
 2022-11-03 09:39:31 +01:00
Siddhesh Poyarekar
9dad716d4d mtrace: Wean away from malloc hooks 
Wean mtrace away from the malloc hooks and move them into the debug
DSO.  Split the API away from the implementation so that we can add
the API to libc.so as well as libc_malloc_debug.so, with the libc
implementations being empty.

Update localplt data since memalign no longer has any callers after
this change.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
 2021-07-22 18:38:06 +05:30
Florian Weimer
3a0ecccb59 ld.so: Do not export free/calloc/malloc/realloc functions [BZ #25486] 
Exporting functions and relying on symbol interposition from libc.so
makes the choice of implementation dependent on DT_NEEDED order, which
is not what some compiler drivers expect.

This commit replaces one magic mechanism (symbol interposition) with
another one (preprocessor-/compiler-based redirection).  This makes
the hand-over from the minimal malloc to the full malloc more
explicit.

Removing the ABI symbols is backwards-compatible because libc.so is
always in scope, and the dynamic loader will find the malloc-related
symbols there since commit f0b2132b35
("ld.so: Support moving versioned symbols between sonames
[BZ #24741]").

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
 2020-02-15 11:01:23 +01:00
Mao Han
5f72b00591 Add C-SKY port 
This patch add two abi combinations support for C-SKY ABIV2: soft-float
little endian, hard float little endian. C-SKY ABI manual and architecture
user guide are available from: https://github.com/c-sky/csky-doc

	* config.h.in (CSKYABI, CSKY_HARD_FLOAT): New Define.
	* scripts/build-many-glibcs.py: Add C-SKY targets.
	* sysdeps/csky/Implies: New file.
	* sysdeps/csky/Makefile: Likewise.
	* sysdeps/csky/abiv2/__longjmp.S: Likewise.
	* sysdeps/csky/abiv2/csky-mcount.S: Likewise.
	* sysdeps/csky/abiv2/dl-trampoline.S: Likewise.
	* sysdeps/csky/abiv2/memcmp.S: Likewise.
	* sysdeps/csky/abiv2/memcpy.S: Likewise.
	* sysdeps/csky/abiv2/memmove.S: Likewise.
	* sysdeps/csky/abiv2/memset.S: Likewise.
	* sysdeps/csky/abiv2/setjmp.S: Likewise.
	* sysdeps/csky/abiv2/start.S: Likewise.
	* sysdeps/csky/abiv2/strcmp.S: Likewise.
	* sysdeps/csky/abiv2/strcpy.S: Likewise.
	* sysdeps/csky/abiv2/strlen.S: Likewise.
	* sysdeps/csky/abiv2/tls-macros.h: Likewise.
	* sysdeps/csky/abort-instr.h: Likewise.
	* sysdeps/csky/atomic-machine.h: Likewise.
	* sysdeps/csky/bits/endian.h: Likewise.
	* sysdeps/csky/bits/fenv.h: Likewise.
	* sysdeps/csky/bits/link.h: Likewise.
	* sysdeps/csky/bits/setjmp.h: Likewise.
	* sysdeps/csky/bsd-_setjmp.S: Likewise.
	* sysdeps/csky/bsd-setjmp.S: Likewise.
	* sysdeps/csky/configure: Likewise.
	* sysdeps/csky/configure.ac: Likewise.
	* sysdeps/csky/dl-machine.h: Likewise.
	* sysdeps/csky/dl-procinfo.c: Likewise.
	* sysdeps/csky/dl-procinfo.h: Likewise.
	* sysdeps/csky/dl-sysdep.h: Likewise.
	* sysdeps/csky/dl-tls.h: Likewise.
	* sysdeps/csky/fpu/fclrexcpt.c: Likewise.
	* sysdeps/csky/fpu/fedisblxcpt.c: Likewise.
	* sysdeps/csky/fpu/feenablxcpt.c: Likewise.
	* sysdeps/csky/fpu/fegetenv.c: Likewise.
	* sysdeps/csky/fpu/fegetexcept.c: Likewise.
	* sysdeps/csky/fpu/fegetmode.c: Likewise.
	* sysdeps/csky/fpu/fegetround.c: Likewise.
	* sysdeps/csky/fpu/feholdexcpt.c: Likewise.
	* sysdeps/csky/fpu/fenv_libc.h: Likewise.
	* sysdeps/csky/fpu/fenv_private.h: Likewise.
	* sysdeps/csky/fpu/fesetenv.c: Likewise.
	* sysdeps/csky/fpu/fesetexcept.c: Likewise.
	* sysdeps/csky/fpu/fesetmode.c: Likewise.
	* sysdeps/csky/fpu/fesetround.c: Likewise.
	* sysdeps/csky/fpu/feupdateenv.c: Likewise.
	* sysdeps/csky/fpu/fgetexcptflg.c: Likewise.
	* sysdeps/csky/fpu/fix-fp-int-convert-overflow.h: Likewise.
	* sysdeps/csky/fpu/fraiseexcpt.c: Likewise.
	* sysdeps/csky/fpu/fsetexcptflg.c: Likewise.
	* sysdeps/csky/fpu/ftestexcept.c: Likewise.
	* sysdeps/csky/fpu/libm-test-ulps: Likewise.
	* sysdeps/csky/fpu/libm-test-ulps-name: Likewise.
	* sysdeps/csky/fpu_control.h: Likewise.
	* sysdeps/csky/gccframe.h: Likewise.
	* sysdeps/csky/jmpbuf-unwind.h: Likewise.
	* sysdeps/csky/ldsodefs.h: Likewise.
	* sysdeps/csky/libc-tls.c: Likewise.
	* sysdeps/csky/linkmap.h: Likewise.
	* sysdeps/csky/machine-gmon.h: Likewise.
	* sysdeps/csky/memusage.h: Likewise.
	* sysdeps/csky/nofpu/Implies: Likewise.
	* sysdeps/csky/nofpu/libm-test-ulps: Likewise.
	* sysdeps/csky/nofpu/libm-test-ulps-name: Likewise.
	* sysdeps/csky/nptl/Makefile: Likewise.
	* sysdeps/csky/nptl/bits/pthreadtypes-arch.h: Likewise.
	* sysdeps/csky/nptl/bits/semaphore.h: Likewise.
	* sysdeps/csky/nptl/pthread-offsets.h: Likewise.
	* sysdeps/csky/nptl/pthreaddef.h: Likewise.
	* sysdeps/csky/nptl/tcb-offsets.sym: Likewise.
	* sysdeps/csky/nptl/tls.h: Likewise.
	* sysdeps/csky/preconfigure: Likewise.
	* sysdeps/csky/sfp-machine.h: Likewise.
	* sysdeps/csky/sotruss-lib.c: Likewise.
	* sysdeps/csky/stackinfo.h: Likewise.
	* sysdeps/csky/sysdep.h: Likewise.
	* sysdeps/csky/tininess.h: Likewise.
	* sysdeps/csky/tst-audit.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/Implies: Likewise.
	* sysdeps/unix/sysv/linux/csky/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/csky/Versions: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/syscall.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/ucontext_i.sym: Likewise.
	* sysdeps/unix/sysv/linux/csky/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/bits/shmlba.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/c++-types.data: Likewise.
	* sysdeps/unix/sysv/linux/csky/configure: Likewise.
	* sysdeps/unix/sysv/linux/csky/configure.ac: Likewise.
	* sysdeps/unix/sysv/linux/csky/ipc_priv.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/jmp_buf-macros.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/kernel-features.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/ld.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/ldconfig.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/libBrokenLocale.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/libanl.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/libcrypt.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/libdl.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/libpthread.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/libresolv.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/librt.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/libthread_db.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/libutil.abilist: Likewise.
	* sysdeps/unix/sysv/linux/csky/localplt.data: Likewise.
	* sysdeps/unix/sysv/linux/csky/makecontext.c: Likewise.
	* sysdeps/unix/sysv/linux/csky/profil-counter.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/pt-vfork.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/register-dump.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/shlib-versions: Likewise.
	* sysdeps/unix/sysv/linux/csky/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/sys/cachectl.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/sys/ucontext.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/sys/user.h: Likewise.
	* sysdeps/unix/sysv/linux/csky/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/csky/sysdep.h: Likewise.
 2018-12-21 09:48:04 +08:00