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rtld-elf: link udivmoddi4 from compiler_rt

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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
This commit is contained in:
Ryan Libby 2020-12-19 08:38:31 +00:00
parent 198a0e58ec
commit bce2cff0bc
1 changed files with 6 additions and 1 deletions
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7
libexec/rtld-elf/rtld-libc/Makefile.inc
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@ -51,8 +51,12 @@ _libc_other_objects= sigsetjmp lstat stat fstat fstatat fstatfs syscall \
getdirentries _getdirentries _close _fcntl _open _openat _read \
_sigprocmask _write readlink __realpathat _setjmp setjmp setjmperr
# Allow building files from libcompiler_rt. Beware, there are some name
# collisions between libcompiler_rt files and libc files.
CRTSRC= ${SRCTOP}/contrib/llvm-project/compiler-rt/lib/builtins
.PATH: ${CRTSRC}
# Finally add additional architecture-dependent libc dependencies
# Finally add additional architecture-dependent dependencies
.if ${LIBC_ARCH} == "arm"
# ARM needs aeabi_unwind_cpp for _setjmp
_libc_other_objects+=aeabi_unwind_cpp
@ -60,6 +64,7 @@ _libc_other_objects+=aeabi_unwind_cpp
# __udivdi3 is needed by kvprintf() in rtld_printf.c
# i386 also needs i386_set_gsbase for allocate_initial_tls()
_libc_other_objects+=umoddi3 udivdi3 qdivrem i386_set_gsbase
SRCS+= udivmoddi4.c
.elif ${LIBC_ARCH} == "powerpc" || ${LIBC_ARCH} == "powerpcspe"
# ppc needs __syncicache for reloc.c and __umoddi3+__udivdi3 for rtld_printf.c
_libc_other_objects+=syncicache umoddi3 udivdi3 qdivrem