https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89172
--- Comment #1 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> --- Author: ian Date: Wed Feb 27 22:35:10 2019 New Revision: 269266 URL: https://gcc.gnu.org/viewcvs?rev=269266&root=gcc&view=rev Log: PR go/89172 internal/cpu, runtime, runtime/pprof: handle function descriptors When using PPC64 ELF ABI v1 a function address is not a PC, but is the address of a function descriptor. The first field in the function descriptor is the actual PC (see http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#FUNC-DES). The libbacktrace library knows about this, and libgo uses actual PC values consistently except for the helper function funcPC that appears in both runtime and runtime/pprof. This patch fixes funcPC by recording, in the internal/cpu package, whether function descriptors are being used. We have to check for function descriptors using a C compiler check, because GCC can be configured using --with-abi to select the ELF ABI to use. Fixes https://gcc.gnu.org/PR89172 Reviewed-on: https://go-review.googlesource.com/c/162978 Modified: trunk/gcc/go/gofrontend/MERGE trunk/libgo/Makefile.am trunk/libgo/Makefile.in trunk/libgo/configure trunk/libgo/configure.ac trunk/libgo/go/runtime/pprof/proto.go trunk/libgo/go/runtime/proc.go trunk/libgo/testsuite/Makefile.in
