[PATCH v8 0/6] glibc: Add SFrame support for stack backtracing

[claudiu.zissulescu-ianculescu@oracle.com]

From: Claudiu Zissulescu <claudiu.zissulescu-ianculescu@oracle.com>

Hello,

Please find the final SFrame patch series. All the patches were
approved by DJ/Florian.

I would like to thank for the review to all reviewers.

Please consider this series to commit into mainline as I do not have
rights to do so.

Thank you,
Claudiu

ABI impact notes:
* Changes in 'struct dl_find_object'
 - A new member 'void *dlfo_sframe' is inserted to the structure.
 
 - The member '__dlfo_reserved' is changed, removing one element, which
   is a decrease of 64bits.
 
 - The size of the type has not changed, as the new added field (i.e.,
   dlfo_sframe) size is of the same size as of the one element removed
   from struct memeber __dlfo_reserved. For 32bit systems, a padding is
   added to compensate for pointer size change.

 - A new macro DLF_SFRAME is introduced.  It helps controlling the
   newly introduced flag bit in dlfo_flags member. This may implies
   changing specific ABI tests (e.g. glibc: update
   conform/data/dlfcn.h-data file)

 - The function 'dl_find_object' is called within libc' backtrace
   routine using GLRO macro, thus avoinding any PLT calls.
 
* Possible issues
 - Automatic ABI checkers may mark this change as an ABI change, thus,
   human review and updating of the scripts is required.
 
 - For unknown programs which directly access the '__dlfo_reserved'
   field, this change is incompatible. As note, this field should not
   be used by anyone as it is reserved for further changes of the
   dl_find_object structure.

Other observations:

 - The SFrame backtracer is falling back to Dwarf unwinder if it
   detects any posibility of a truncate trace.

 - Compiling the x86 tst-quadmod1.S test file with --gsframe will hit
   binutils' assembler Bug #32879.

Thank you,
Claudiu


Claudiu Zissulescu (6):
  elf: Add SFrame support to _dl_find_object function
  x86: Add SFrame support for x86 architecture
  aarch64: Add SFrame support for aarch64 architecture
  elf: Add SFrame stack tracing
  configure: Add --enable-sframe option
  SFrame: Add tests that uses DWARF backtracer

 INSTALL                                       |   5 +
 Makeconfig                                    |   8 +-
 NEWS                                          |   4 +
 config.make.in                                |   1 +
 configure                                     | 129 ++++
 configure.ac                                  |  44 ++
 debug/Makefile                                |  28 +
 debug/backtrace.c                             |  46 +-
 dlfcn/dlfcn.h                                 |  10 +-
 elf/dl-find_object.h                          |  52 +-
 manual/dynlink.texi                           |  17 +-
 manual/install.texi                           |   5 +
 sysdeps/generic/Makefile                      |   1 +
 sysdeps/generic/sframe-read.c                 | 566 ++++++++++++++++++
 sysdeps/generic/sframe-read.h                 | 106 ++++
 sysdeps/generic/sframe.c                      | 187 ++++++
 sysdeps/generic/sframe.h                      | 367 ++++++++++++
 sysdeps/generic/uw-sigframe.h                 |  31 +
 sysdeps/unix/sysv/linux/aarch64/uw-sigframe.h |  78 +++
 sysdeps/unix/sysv/linux/x86_64/uw-sigframe.h  |  76 +++
 20 files changed, 1743 insertions(+), 18 deletions(-)
 create mode 100644 sysdeps/generic/sframe-read.c
 create mode 100644 sysdeps/generic/sframe-read.h
 create mode 100644 sysdeps/generic/sframe.c
 create mode 100644 sysdeps/generic/sframe.h
 create mode 100644 sysdeps/generic/uw-sigframe.h
 create mode 100644 sysdeps/unix/sysv/linux/aarch64/uw-sigframe.h
 create mode 100644 sysdeps/unix/sysv/linux/x86_64/uw-sigframe.h

-- 
2.50.1