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aef199e563
This allows for rtld to not issue two sigprocmask(2) syscalls for each
symbol binding operation in single-threaded processes. Rtld needs to
block signals as part of locking to ensure signal safety of the bind
process, because signal handlers might need to lazily resolve symbol
references.
As result, number of syscalls issued on startup by simple programs not
using libthr, is typically reduced 2x. For instance, for hello world,
I see:
non-sigfastblock
# (truss ./hello > /dev/null) |& wc -l
63
sigfastblock
# (truss ./hello > /dev/null) |& wc -l
37
Tested by: pho
Disscussed with: cem, emaste, jilles
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D12773
102 lines
4.2 KiB
Makefile
102 lines
4.2 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}/${MACHINE_ARCH})
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LIBC_ARCH=${MACHINE_ARCH}
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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 \
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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 _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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# __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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.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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.elif ${LIBC_ARCH} == "sparc64"
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# reloc.c uses __sparc_utrap which needs a lot of other object files
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_libc_other_objects+=__sparc_utrap __sparc_utrap_fp_disabled __sparc_utrap_gen \
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__sparc_utrap_setup __sparc_utrap_align __sparc_utrap_emul kill getpid \
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fpu fpu_explode fpu_div fpu_reg fpu_sqrt fpu_implode fpu_subr fpu_add \
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fpu_compare fpu_mul
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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} ${SRCTOP}/libexec/rtld-elf/rtld-libc/Makefile.inc
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${AR} x ${LIBC_NOSSP_PIC} ${_rtld_libc_objs}
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${AR} cr ${.OBJDIR}/${.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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