forked from Imagelibrary/binutils-gdb
98d9fe6cb6
Enable unwinding using .eh_frame information through PLT entries. Based on x86-64. This enhances stack traces if the instruction pointer is in a PLT entry. For instance perf call graphs, when using --call-graph=dwarf, and Glibc backtraces, when using backtrace() e.g. from a signal handler. Note that GDB could already unwind through PLT entries using its s390- specific prologue unwinder. Furthermore this lays the foundation to generate SFrame information for the PLT section in the future. bfd/ * elf64-s390.c: Include dwarf2.h. (PLT_CIE_SIZE, PLT_FDE_SIZE, PLT_FDE_START_OFFSET, PLT_FDE_LEN_OFFSET, elf_s390x_eh_frame_plt): New .eh_frame template for .plt section. (elf_s390_link_hash_table): Add plt_eh_frame field. (elf_s390_create_dynamic_sections): New s390-specific wrapper around _bfd_elf_create_dynamic_sections. Create .eh_frame section for .plt section. (elf_backend_create_dynamic_sections): Register s390-specific elf_s390_create_dynamic_sections. (elf_s390_late_size_sections): Fill in .eh_frame section for .plt section. Write .plt section size into .eh_frame FDE covering .plt section. (elf_s390_finish_dynamic_sections): Write .plt section start into .eh_frame FDE covering .plt section. Call _bfd_elf_write_section_eh_frame on on htab->plt_eh_frame section. ld/ * NEWS: Add news entry. * emulparams/elf64_s390.sh: Include plt_unwind.sh. ld/testsuite/ * ld-s390/plt_64-1_eh.wf: New PLT .eh_frame generation test. * ld-s390/s390.exp: Link some existing test cases with --no-ld-generated-unwind-info so that they do not fail. Run new PLT .eh_frame generation test. Signed-off-by: Jens Remus <jremus@linux.ibm.com>