objdump, readelf: sframe: apply relocations before textual dump

objdump, readelf: sframe: apply relocations before textual dump

PR libsframe/32589 - function start address is zero in SFrame section dump

Currently, readelf and objdump display the SFrame sections in ET_REL
object files with function start addresses of each function as 0.  This
makes it difficult to correlate SFrame stack trace information with the
individual functions in the object file.

For objdump, use the dump_dwarf () interface to dump SFrame section.
Similarly, for readelf, use the display_debug_section () interface to
dump SFrame section.  These existing interfaces (for DWARF debug
sections) already support relocating the section contents before
dumping, so lets use them for SFrame sections as well.

When adding a new entry for SFrame in debug_option_table[], use char
'nil' and the option name of "sframe-internal-only".  This is done so
that there is no additional (unnecessary) user-exposed ways of dumping
SFrame sections.  Additionally, we explicitly disallow the
"sframe-internal-only" from external/user input in --dwarf (objdump).
Similarly, "sframe-internal-only" is explicitly matched and disallowed
from --debug-dump (readelf).

For objdump and readelf, we continue to keep the same error messaging as
earlier:

  $ objdump --sframe=sframe bubble_sort.o
  ...
  No sframe section present

  $ objdump --sframe=.sfram bubble_sort.o
  ...
  No .sfram section present

  $ objdump --sframe=sframe-internal-only sort
  ...
  No sframe-internal-only section present

Similarly for readelf:

  $ readelf --sframe= bubble_sort.o
  readelf: Error: Section name must be provided
  $ readelf --sframe=.sfram bubble_sort.o
  readelf: Warning: Section '.sfram' was not dumped because it does not exist
  $ readelf --sframe=sframe bubble_sort.o
  readelf: Warning: Section 'sframe' was not dumped because it does not exist

PS: Note how this patch adds a new entry to debug_displays[] with a
    relocate value set to FALSE.  This will be set to TRUE in a subsequent
    patch ("bfd: gas: ld: libsframe: emit func start addr field as an offset
    from FDE") when fixes are made to emit the value of the
    'sfde_func_start_address' field in the new encoding
    SFRAME_F_FDE_FUNC_START_PCREL across gas and ld.

binutils/
	* dwarf.c (display_sframe): New definition.
	(dwarf_select_sections_all): Enable SFrame section too.
	(struct dwarf_section_display): Add entry for SFrame section.
	* dwarf.h (enum dwarf_section_display_enum): Add enumerator for
	SFrame.
	* objdump.c (dump_section_sframe): Remove.
	(dump_sframe_section): Add new definition.
	(dump_bfd): Use dump_sframe_section.
	* binutils/readelf.c (dump_section_as_sframe): Remove.