[PATCH 0/3] s390: Generate .eh_frame unwind information for .plt section

[Andreas Krebbel]

Hi Jens,

Patches are ok. Thank you very much!

Andreas


On 1/22/25 3:10 PM, Jens Remus wrote:
> This enables the linker on s390x to generate .eh_frame unwind
> information for the .plt section.  Based on x86-64.  This enables
> e.g. perf to unwind through PLT entries.  Furthermore this lays the
> foundation to generate SFrame stack trace information in the future.
>
> Patch 1 resolves an issue in the linker s390 emulation option parsing.
> This is a prerequisite to add support for linker option
> "--[no-]ld-generated-unwind-info" in patch 3.
>
> Patch 2 adds basic PLT generation tests that are extended in patch 3.
>
> Patch 3 adds support for linker option
> "--[no-]ld-generated-unwind-info" and enables the linker to generate
> .eh_frame for .plt by default.
>
> Regards,
> Jens
>
> Jens Remus (3):
>    s390: Fix linker s390 emulation option parsing
>    s390: Add basic PLT generation tests
>    s390: Generate .eh_frame unwind information for .plt section
>
>   bfd/elf64-s390.c                         | 126 ++++++++++++++++++++++-
>   ld/NEWS                                  |   6 ++
>   ld/emulparams/elf64_s390.sh              |   1 +
>   ld/emultempl/s390.em                     |   6 +-
>   ld/testsuite/ld-s390/plt_31-1.s          |  40 +++++++
>   ld/testsuite/ld-s390/plt_31-1.wf         |  32 ++++++
>   ld/testsuite/ld-s390/plt_31_non-pic-1.pd |  54 ++++++++++
>   ld/testsuite/ld-s390/plt_31_pic-1.pd     |  57 ++++++++++
>   ld/testsuite/ld-s390/plt_64-1.pd         |  38 +++++++
>   ld/testsuite/ld-s390/plt_64-1.s          |  26 +++++
>   ld/testsuite/ld-s390/plt_64-1.wf         |  33 ++++++
>   ld/testsuite/ld-s390/plt_64-1_eh.wf      |  31 ++++++
>   ld/testsuite/ld-s390/pltlib.s            |  16 +++
>   ld/testsuite/ld-s390/s390.exp            |  28 ++++-
>   14 files changed, 488 insertions(+), 6 deletions(-)
>   create mode 100644 ld/testsuite/ld-s390/plt_31-1.s
>   create mode 100644 ld/testsuite/ld-s390/plt_31-1.wf
>   create mode 100644 ld/testsuite/ld-s390/plt_31_non-pic-1.pd
>   create mode 100644 ld/testsuite/ld-s390/plt_31_pic-1.pd
>   create mode 100644 ld/testsuite/ld-s390/plt_64-1.pd
>   create mode 100644 ld/testsuite/ld-s390/plt_64-1.s
>   create mode 100644 ld/testsuite/ld-s390/plt_64-1.wf
>   create mode 100644 ld/testsuite/ld-s390/plt_64-1_eh.wf
>   create mode 100644 ld/testsuite/ld-s390/pltlib.s
>