Support use of LLVM's libunwind for exception unwinding

It is built in libgcc_s.so and libgcc_eh.a to simplify transition.

It is enabled by default on arm64 (where we previously had no other
unwinder) and may be enabled for testing on other platforms by setting
WITH_LLVM_LIBUNWIND in src.conf(5).

Also add compiler-rt's __gcc_personality_v0 implementation for use with
the LLVM unwinder.

Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D4787
This commit is contained in:
Ed Maste 2016-01-09 00:42:07 +00:00
parent 1f17dba482
commit b80f3546a8
Notes: svn2git 2020-12-20 02:59:44 +00:00
svn path=/head/; revision=293450
4 changed files with 57 additions and 6 deletions

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@ -2,6 +2,9 @@
GCCDIR= ${.CURDIR}/../../../contrib/gcc
GCCLIB= ${.CURDIR}/../../../contrib/gcclibs
COMPILERRTDIR= ${.CURDIR}/../../../contrib/compiler-rt
UNWINDINCDIR= ${.CURDIR}/../../../contrib/llvm/projects/libunwind/include
UNWINDSRCDIR= ${.CURDIR}/../../../contrib/llvm/projects/libunwind/src
SHLIB_NAME= libgcc_s.so.1
SHLIBDIR?= /lib
@ -67,8 +70,37 @@ LIB2ADD = $(LIB2FUNCS_EXTRA)
LIB2ADD_ST = $(LIB2FUNCS_STATIC_EXTRA)
# Additional sources to handle exceptions; overridden by targets as needed.
.if ${MK_LLVM_LIBUNWIND} != "no"
.PATH: ${COMPILERRTDIR}/lib/builtins
.PATH: ${UNWINDSRCDIR}
LIB2ADDEH = gcc_personality_v0.c \
int_util.c \
Unwind-EHABI.cpp \
Unwind-sjlj.c \
UnwindLevel1-gcc-ext.c \
UnwindLevel1.c \
UnwindRegistersRestore.S \
UnwindRegistersSave.S \
libunwind.cpp
CFLAGS+= -I${UNWINDINCDIR} -I${.CURDIR}
.if empty(CXXFLAGS:M-std=*)
CXXFLAGS+= -std=c++11
.endif
CXXFLAGS+= -fno-rtti
.else # MK_LLVM_LIBUNWIND
.if ${TARGET_CPUARCH} == "arm"
LIB2ADDEH = unwind-arm.c libunwind.S pr-support.c unwind-c.c
.else
LIB2ADDEH = unwind-dw2.c unwind-dw2-fde-glibc.c unwind-sjlj.c gthr-gnat.c \
unwind-c.c
.endif
.endif # MK_LLVM_LIBUNWIND
LIB2ADDEHSTATIC = $(LIB2ADDEH)
LIB2ADDEHSHARED = $(LIB2ADDEH)
@ -116,7 +148,6 @@ CFLAGS.clang+= -fheinous-gnu-extensions
LIB1ASMSRC = lib1funcs.asm
LIB1ASMFUNCS = _dvmd_tls _bb_init_func
LIB2ADDEH = unwind-arm.c libunwind.S pr-support.c unwind-c.c
# Some compilers generate __aeabi_ functions libgcc_s is missing
LIBADD+= compiler_rt
.endif
@ -160,7 +191,10 @@ LIB2_DIVMOD_FUNCS:= ${LIB2_DIVMOD_FUNCS:S/${sym}//g}
.endfor
.endif
COMMONHDRS= tm.h tconfig.h options.h unwind.h gthr-default.h
COMMONHDRS= tm.h tconfig.h options.h gthr-default.h
.if ${MK_LLVM_LIBUNWIND} == no
COMMONHDRS+= unwind.h
.endif
#-----------------------------------------------------------------------
#
@ -170,6 +204,9 @@ HIDE = -fvisibility=hidden -DHIDE_EXPORTS
CC_T = ${CC} -c ${CFLAGS} ${HIDE} -fPIC
CC_P = ${CC} -c ${CFLAGS} ${HIDE} -p -fPIC
CC_S = ${CC} -c ${CFLAGS} ${PICFLAG} -DSHARED
CXX_T = ${CXX} -c ${CXXFLAGS} ${HIDE} -fPIC
CXX_P = ${CXX} -c ${CXXFLAGS} ${HIDE} -p -fPIC
CXX_S = ${CXX} -c ${CXXFLAGS} ${PICFLAG} -DSHARED
#-----------------------------------------------------------------------
#
@ -284,16 +321,26 @@ EH_OBJS_S = ${LIB2ADDEHSHARED:R:S/$/.So/}
EH_CFLAGS = -fexceptions -D__GLIBC__=3 -DElfW=__ElfN
SOBJS += ${EH_OBJS_S}
.for _src in ${LIB2ADDEHSTATIC}
.for _src in ${LIB2ADDEHSTATIC:M*.c}
${_src:R:S/$/.o/}: ${_src} ${COMMONHDRS}
${CC_T} ${EH_CFLAGS} -o ${.TARGET} ${.IMPSRC}
${_src:R:S/$/.po/}: ${_src} ${COMMONHDRS}
${CC_P} ${EH_CFLAGS} -o ${.TARGET} ${.IMPSRC}
.endfor
.for _src in ${LIB2ADDEHSHARED}
.for _src in ${LIB2ADDEHSTATIC:M*.cpp}
${_src:R:S/$/.o/}: ${_src} ${COMMONHDRS}
${CXX_T} ${EH_CFLAGS} -o ${.TARGET} ${.IMPSRC}
${_src:R:S/$/.po/}: ${_src} ${COMMONHDRS}
${CXX_P} ${EH_CFLAGS} -o ${.TARGET} ${.IMPSRC}
.endfor
.for _src in ${LIB2ADDEHSHARED:M*.c}
${_src:R:S/$/.So/}: ${_src} ${COMMONHDRS}
${CC_S} ${EH_CFLAGS} -o ${.TARGET} ${.IMPSRC}
.endfor
.for _src in ${LIB2ADDEHSHARED:M*.cpp}
${_src:R:S/$/.So/}: ${_src} ${COMMONHDRS}
${CXX_S} ${EH_CFLAGS} -o ${.TARGET} ${.IMPSRC}
.endfor
#-----------------------------------------------------------------------

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@ -231,9 +231,9 @@ __DEFAULT_NO_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
# In-tree binutils/gcc are older versions without modern architecture support.
.if ${__T} == "aarch64" || ${__T} == "riscv64"
BROKEN_OPTIONS+=BINUTILS BINUTILS_BOOTSTRAP GCC GCC_BOOTSTRAP GDB
__DEFAULT_YES_OPTIONS+=ELFCOPY_AS_OBJCOPY
__DEFAULT_YES_OPTIONS+=ELFCOPY_AS_OBJCOPY LLVM_LIBUNWIND
.else
__DEFAULT_NO_OPTIONS+=ELFCOPY_AS_OBJCOPY
__DEFAULT_NO_OPTIONS+=ELFCOPY_AS_OBJCOPY LLVM_LIBUNWIND
.endif
.if ${__T} == "riscv64"
BROKEN_OPTIONS+=PROFILE # "sorry, unimplemented: profiler support for RISC-V"

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@ -0,0 +1,2 @@
.\" $FreeBSD$
Set to use GCC's stack unwinder (instead of LLVM's libunwind).

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@ -0,0 +1,2 @@
.\" $FreeBSD$
Set to use LLVM's libunwind stack unwinder (instead of GCC's unwinder).