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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>
43 lines
989 B
Bash
43 lines
989 B
Bash
source_sh ${srcdir}/emulparams/plt_unwind.sh
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SCRIPT_NAME=elf
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ELFSIZE=64
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OUTPUT_FORMAT="elf64-s390"
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NO_REL_RELOCS=yes
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TEXT_START_ADDR=0x1000000
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MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
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COMMONPAGESIZE="CONSTANT (COMMONPAGESIZE)"
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ARCH="s390:64-bit"
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MACHINE=
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NOP=0x07070707
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TEMPLATE_NAME=elf
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GENERATE_SHLIB_SCRIPT=yes
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GENERATE_PIE_SCRIPT=yes
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GENERATE_RELRO_SCRIPT=yes
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NO_SMALL_DATA=yes
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EXTRA_EM_FILE=s390
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IREL_IN_PLT=
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SEPARATE_GOTPLT=0
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test -z "$RELRO" && unset SEPARATE_GOTPLT
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SYMBOL_ABI_ALIGNMENT=2
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# Treat a host that matches the target with the possible exception of "x"
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# in the name as if it were native.
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if test `echo "$host" | sed -e s/390x/390/` \
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= `echo "$target" | sed -e s/390x/390/`; then
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case " $EMULATION_LIBPATH " in
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*" ${EMULATION_NAME} "*)
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NATIVE=yes
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esac
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fi
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# Look for 64 bit target libraries in /lib64, /usr/lib64 etc., first
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# on Linux.
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case "$target" in
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s390*-linux*)
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case "$EMULATION_NAME" in
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*64*)
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LIBPATH_SUFFIX=64 ;;
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esac
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;;
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esac
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