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63f93c7e11
Statically link rtld-elf with libcompiler_rt on all architectures so that we don't need to try to pick and choose the bits we need from it for each architecture (we now leave that to the linker). Compilers may emit calls to support functions in this library, but because of the use of the linker flag -nostdlib for rtld's special needs, the library is not linked as normal. Previously we had two different solutions. On some architectures, we were able to extract reimplementations of the necessary builtin functions from our special build of libc. On ARM, we just linked libcompiler_rt. This is motivated by the same issue as D26199 and D27665, but should be a simpler solution that will apply to all architectures. Reviewed by: arichardson, kib Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D27736
89 lines
3.5 KiB
Makefile
89 lines
3.5 KiB
Makefile
# $FreeBSD$
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# This makefiles adds the necessary libc dependencies for RTLD without pulling
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# in all of the complex libc bits such as locales, etc.
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.include <bsd.compiler.mk>
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LIBC_SRCTOP=${SRCTOP}/lib/libc
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.if exists(${LIBC_SRCTOP}/${MACHINE_ARCH:S/powerpc64le/powerpc64/})
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LIBC_ARCH=${MACHINE_ARCH:S/powerpc64le/powerpc64/}
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.else
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LIBC_ARCH=${MACHINE_CPUARCH}
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.endif
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CFLAGS+= -I${SRCTOP}/libexec/rtld-elf/rtld-libc
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# Build all the libc files that use interposed symbols or pthreads again for
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# RTLD. We compile with a different libc_private.h and namespace.h that
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# redirects all calls to interposed functions to use the non-interposed version
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# instead.
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.PATH: ${LIBC_SRCTOP}/gen
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SRCS+= opendir.c closedir.c readdir.c telldir.c
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# Avoid further dependencies by providing simple implementations of libc
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# functions such as __error(), etc.
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.PATH: ${SRCTOP}/libexec/rtld-elf/rtld-libc
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SRCS+= rtld_libc.c
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# Now build the remaining files from libc:
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.PATH: ${LIBC_SRCTOP}/stdlib
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SRCS+= reallocf.c realpath.c getenv.c merge.c reallocarray.c
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# TODO: fix merge.c to build with WARNS=6
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.if ${COMPILER_TYPE} == "clang"
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CFLAGS.merge.c+=-Wno-error=null-pointer-arithmetic
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.endif
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.PATH: ${LIBC_SRCTOP}/gen
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SRCS+= errlst.c getcwd.c getprogname.c raise.c sigsetops.c sysctlnametomib.c \
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__xuname.c
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# errlst.c needs the errlst.h header from libc:
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CFLAGS.errlst.c+=-I${LIBC_SRCTOP}/include
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# Use the string and memory .o files from libc instead of rebuilding them (they
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# might be using optimized assembly and duplicating that logic here is awkward).
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_libc_string_objects= bcmp bcopy bzero memset memchr memcmp memcpy memmove \
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stpncpy strcat strchr strcmp stpcpy strcpy strcspn strdup strlcat strlcpy \
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strlen strncmp strncpy strrchr strsep strspn strstr strtok
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# Also use all the syscall .o files from libc_nossp_pic:
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_libc_other_objects= sigsetjmp lstat stat fstat fstatat fstatfs syscall \
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cerror geteuid getegid sigfastblock munmap mprotect \
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sysarch __sysctl issetugid __getcwd utrace getpid \
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thr_self thr_kill pread mmap lseek _exit _fstat _fstatat _fstatfs \
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getdirentries _getdirentries _close _fcntl _open _openat _read \
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_sigprocmask _write readlink __realpathat _setjmp setjmp setjmperr
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# Finally add additional architecture-dependent libc dependencies
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.if ${LIBC_ARCH} == "arm"
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# ARM needs aeabi_unwind_cpp for _setjmp
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_libc_other_objects+=aeabi_unwind_cpp
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.elif ${LIBC_ARCH} == "i386"
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# i386 needs i386_set_gsbase for allocate_initial_tls()
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_libc_other_objects+=i386_set_gsbase
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.elif ${LIBC_ARCH} == "powerpc" || ${LIBC_ARCH} == "powerpcspe"
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# ppc needs __syncicache and abs for reloc.c
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_libc_other_objects+=syncicache abs
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.elif ${LIBC_ARCH} == "powerpc64"
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# ppc64 needs __syncicache for reloc.c
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_libc_other_objects+=syncicache
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.endif
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# Extract all the .o files from libc_nossp_pic.a. This ensures that
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# we don't accidentally pull in the interposing table or similar by linking
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# directly against libc_nossp_pic.a
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_rtld_libc_objs=
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.for _obj in ${_libc_other_objects} ${_libc_string_objects}
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_rtld_libc_objs+=${_obj}.nossppico
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CLEANFILES+=${_obj}.nossppico
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# LDFLAGS+= -Wl,--trace-symbol=${_obj}
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.endfor
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# LDFLAGS+= -Wl,--trace
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# We insert all the .o files from libc_nossp_pic.a into a new rtld_libc.a file
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# to ensure that only .o files that are actually used end up being included.
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rtld_libc.a: ${LIBC_NOSSP_PIC} ${SRCTOP}/libexec/rtld-elf/rtld-libc/Makefile.inc
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@rm -f ${.TARGET}
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${AR} x ${LIBC_NOSSP_PIC} ${_rtld_libc_objs}
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${AR} cr ${.TARGET} ${_rtld_libc_objs}
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CLEANFILES+=rtld_libc.a
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LDADD+=${.OBJDIR}/rtld_libc.a
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beforelinking: rtld_libc.a
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