bce2cff0bc
This fixes the gcc9 build of rtld-elf32 on amd64, which needed an implementation of udivmoddi4. rtld-elf uses certain functions normally found in libc, and so it includes certain files from libc in its own build. It has two mechanisms to include files from libc: one that rebuilds source files in the rtld-elf environment, and one that extracts object files from a purpose-built no-SSP PIC archive. In addition to libc functions, rtld-elf may need to link functions normally found in libcompiler_rt (formerly libgcc). Now, add an ability to rebuild libcompiler_rt source files in the rtld-elf environment. We don't yet have a need for an object file extraction mechanism. libcompiler_rt could also supply udivdi3 and umoddi3, but leave them alone for now. Reviewed by: arichardson, kib Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D27665
103 lines
4.1 KiB
Makefile
103 lines
4.1 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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# Allow building files from libcompiler_rt. Beware, there are some name
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# collisions between libcompiler_rt files and libc files.
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CRTSRC= ${SRCTOP}/contrib/llvm-project/compiler-rt/lib/builtins
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.PATH: ${CRTSRC}
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# Finally add additional architecture-dependent 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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# __udivdi3 is needed by kvprintf() in rtld_printf.c
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# i386 also needs i386_set_gsbase for allocate_initial_tls()
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_libc_other_objects+=umoddi3 udivdi3 qdivrem i386_set_gsbase
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SRCS+= udivmoddi4.c
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.elif ${LIBC_ARCH} == "powerpc" || ${LIBC_ARCH} == "powerpcspe"
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# ppc needs __syncicache for reloc.c and __umoddi3+__udivdi3 for rtld_printf.c
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_libc_other_objects+=syncicache umoddi3 udivdi3 qdivrem
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# for some reason there is also a reference to abs()
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_libc_other_objects+=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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.elif ${LIBC_ARCH} == "mips"
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# 32-bit MIPS needs __umoddi3+__udivdi3 for rtld_printf.c
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.if ${MACHINE_ARCH:Mmipsn32*} == "" && ${MACHINE_ARCH:Mmips64*} == ""
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_libc_other_objects+=umoddi3 udivdi3 qdivrem
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.endif
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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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