freebsd-dev/libexec/rtld-elf/Makefile
John Polstra d3980376e8 Add a new function dllockinit() for registering thread locking
functions to be used by the dynamic linker.  This can be called by
threads packages at start-up time.  I will add the call to libc_r
soon.

Also add a default locking method that is used up until dllockinit()
is called.  The default method works by blocking SIGVTALRM, SIGPROF,
and SIGALRM in critical sections.  It is based on the observation
that most user-space threads packages implement thread preemption
with one of these signals (usually SIGVTALRM).

The dynamic linker has never been reentrant, but it became less
reentrant in revision 1.34 of "src/libexec/rtld-elf/rtld.c".
Starting with that revision, multiple threads each doing lazy
binding could interfere with each other.  The usual symptom was
that a symbol was falsely reported as undefined at start-up time.
It was rare but not unseen.  This commit fixes it.
1999-12-27 04:44:04 +00:00

43 lines
1.0 KiB
Makefile

#
# $FreeBSD$
#
MAINTAINER= jdp
PROG= ld-elf.so.1
SRCS= rtld_start.S rtld.c lockdflt.c map_object.c malloc.c \
xmalloc.c debug.c reloc.c
NOMAN= true
CFLAGS+= -Wall -DFREEBSD_ELF -I${.CURDIR}/${MACHINE_ARCH} -I${.CURDIR}
LDFLAGS+= -nostdlib -e .rtld_start
INSTALLFLAGS+= -fschg -C
.if exists(${.CURDIR}/${MACHINE_ARCH}/Makefile.inc)
.include "${.CURDIR}/${MACHINE_ARCH}/Makefile.inc"
.endif
# If LDSCRIPT is defined, we build the dynamic linker as an
# executable. Otherwise we build it as a shared object. We ignore
# LDSCRIPT if the running kernel is too old to support it.
.if defined(LDSCRIPT)
KERN_OSRELDATE!= /sbin/sysctl -n kern.osreldate 2>/dev/null || echo 0
.if ${KERN_OSRELDATE} >= 400001
LDSO_IS_EXECUTABLE= yes
.endif
.endif
.ifdef LDSO_IS_EXECUTABLE
OBJS+= dyn_hack.so
LDFLAGS+= -Wl,-T,${LDSCRIPT} -Wl,-E -Wl,-Bstatic
LDADD+= -lc
.else
CFLAGS+= -fpic -DPIC
LDFLAGS+= -shared -Wl,-Bsymbolic
LDADD+= -lc_pic
.endif
dyn_hack.so:
${CC} -shared -nostdlib -o dyn_hack.so -x c /dev/null
.PATH: ${.CURDIR}/${MACHINE_ARCH}
.include <bsd.prog.mk>