gdb: Remove support for obsolete OSABIs and a.out

gdb/ChangeLog:
2016-12-09  Pedro Alves  <palves@redhat.com>

	* Makefile.in (ALL_TARGET_OBS): Remove vax-obsd-tdep.o.
	* alpha-fbsd-tdep.c (_initialize_alphafbsd_tdep): Adjust.
	* alpha-nbsd-tdep.c: Move comment to _initialize_alphanbsd_tdep.
	(alphanbsd_core_osabi_sniffer): Delete.
	(_initialize_alphanbsd_tdep): No longer handle a.out.
	* alpha-obsd-tdep.c (_initialize_alphaobsd_tdep): Adjust.
	* amd64-fbsd-tdep.c (_initialize_amd64fbsd_tdep): Adjust.
	* amd64-nbsd-tdep.c (_initialize_amd64nbsd_tdep): Adjust.
	* amd64-obsd-tdep.c (amd64obsd_supply_regset)
	(amd64obsd_combined_regset)
	(amd64obsd_iterate_over_regset_sections, amd64obsd_core_init_abi):
	Delete.
	(_initialize_amd64obsd_tdep): Don't handle a.out.
	* arm-nbsd-nat.c (struct md_core, fetch_core_registers)
	(arm_netbsd_core_fns): Delete.
	(_initialize_arm_netbsd_nat): Don't register arm_netbsd_core_fns.
	* arm-nbsd-tdep.c (arm_netbsd_aout_init_abi)
	(arm_netbsd_aout_osabi_sniffer): Delete.
	(_initialize_arm_netbsd_tdep): Don't handle a.out.
	* arm-obsd-tdep.c (armobsd_core_osabi_sniffer): Delete.
	(_initialize_armobsd_tdep): Don't handle a.out.
	* arm-tdep.c (arm_gdbarch_init): Remove bfd_target_aout_flavour
	case.
	* breakpoint.c (disable_breakpoints_in_unloaded_shlib): Remove
	SunOS a.out handling.
	* configure.tgt (vax-*-netbsd* | vax-*-knetbsd*-gnu): Remove
	vax-obsd-tdep.o from gdb_target_objs.
	(vax-*-openbsd*): Likewise.
	(*-*-freebsd*): Adjust default gdb_osabi.
	(*-*-openbsd*): Likewise.
	* dbxread.c (block_address_function_relative): Delete.
	(dbx_symfile_read): Remove reference to
	block_address_function_relative.
	(dbx_symfile_read): Don't call read_dbx_dynamic_symtab.
	(read_dbx_dynamic_symtab): Delete.
	(process_one_symbol): Remove references to
	block_address_function_relative.
	* defs.h (GDB_OSABI_FREEBSD_AOUT, GDB_OSABI_NETBSD_AOUT): Remove.
	(GDB_OSABI_FREEBSD_ELF): Rename to ...
	(GDB_OSABI_FREEBSD): ... this.
	(GDB_OSABI_NETBSD_ELF): Rename to ...
	(GDB_OSABI_NETBSD): ... this.
	(GDB_OSABI_OPENBSD_ELF): Rename to ...
	(GDB_OSABI_OPENBSD): ... this.
	(GDB_OSABI_HPUX_ELF, GDB_OSABI_HPUX_SOM): Remove.
	* fbsd-tdep.c: Adjust comment.
	* hppa-nbsd-tdep.c (_initialize_hppanbsd_tdep): Adjust.
	* hppa-obsd-tdep.c (GDB_OSABI_NETBSD_CORE): Delete.
	(hppaobsd_core_osabi_sniffer): Delete.
	(_initialize_hppabsd_tdep): Don't handle a.out.
	* hppa-tdep.c (hppa_stub_frame_unwind_cache): Don't handle
	GDB_OSABI_HPUX_SOM.
	(hppa_gdbarch_init): Likewise.
	* i386-bsd-tdep.c (i386bsd_aout_osabi_sniffer)
	(i386bsd_core_osabi_sniffer, _initialize_i386bsd_tdep): Delete.
	* i386-fbsd-tdep.c (i386fbsdaout_init_abi): Delete.  Merge bits
	with ...
	(i386fbsd_init_abi): ... this.
	(_initialize_i386fbsd_tdep): Don't handle a.out.
	* i386-nbsd-tdep.c (_initialize_i386nbsd_tdep): Adjust.
	* i386-obsd-tdep.c (i386obsd_aout_supply_regset)
	(i386obsd_aout_gregset)
	(i386obsd_aout_iterate_over_regset_sections): Delete.
	(i386obsd_init_abi): Merge with i386obsd_elf_init_abi.
	(i386obsd_aout_init_abi): Delete.
	(_initialize_i386obsd_tdep): Don't handle a.out.
	* m68k-bsd-tdep.c (m68kobsd_sigtramp_cache_init)
	(m68kobsd_sigtramp): Delete.
	(m68kbsd_init_abi): Merge with ...
	(m68kbsd_elf_init_abi): ... this, and delete it.
	(m68kbsd_aout_init_abi): Delete.
	(m68kbsd_aout_osabi_sniffer, m68kbsd_core_osabi_sniffer): Delete.
	(_initialize_m68kbsd_tdep): Don't handle a.out.
	* mips-nbsd-tdep.c (_initialize_mipsnbsd_tdep): Adjust.
	* mips64-obsd-tdep.c (_initialize_mips64obsd_tdep): Adjust.
	* osabi.c (gdb_osabi_names): Remove "a.out" entries.  Drop "ELF"
	suffixes.  Remove "HP-UX" entries.
	(generic_elf_osabi_sniff_abi_tag_sections): Adjust.
	(generic_elf_osabi_sniffer): No longer handle GDB_OSABI_HPUX_ELF.
	Adjust.
	(_initialize_ppcfbsd_tdep): Adjust.
	* ppc-nbsd-tdep.c (_initialize_ppcnbsd_tdep): Adjust.
	* ppc-obsd-tdep.c (GDB_OSABI_NETBSD_CORE)
	(ppcobsd_core_osabi_sniffer): Delete.
	(_initialize_ppcobsd_tdep): Don't handle a.out.
	* rs6000-tdep.c (rs6000_gdbarch_init): Adjust.
	* sh-nbsd-tdep.c (GDB_OSABI_NETBSD_CORE)
	(shnbsd_core_osabi_sniffer): Delete.
	(_initialize_shnbsd_tdep): Don't handle a.out.
	* solib.c (clear_solib): Don't handle SunOS/a.out.
	* sparc-nbsd-tdep.c (sparc32nbsd_init_abi): Make extern.
	(sparc32nbsd_aout_init_abi): Delete.
	(sparc32nbsd_elf_init_abi): Merged into sparc32nbsd_init_abi.
	(sparcnbsd_aout_osabi_sniffer): Delete.
	(GDB_OSABI_NETBSD_CORE, sparcnbsd_core_osabi_sniffer): Delete.
	(_initialize_sparcnbsd_tdep): No longer handle a.out.
	* sparc-obsd-tdep.c (sparc32obsd_init_abi)
	(_initialize_sparc32obsd_tdep): Adjust.
	* sparc-tdep.h (sparc32nbsd_elf_init_abi): Rename to ...
	(sparc32nbsd_init_abi): ... this.
	* sparc64-fbsd-tdep.c (_initialize_sparc64fbsd_tdep): Adjust.
	* sparc64-nbsd-tdep.c (_initialize_sparc64nbsd_tdep): Adjust.
	* sparc64-obsd-tdep.c (_initialize_sparc64obsd_tdep): Adjust.
	* stabsread.c: Update comment.
	* symmisc.c (print_objfile_statistics): Don't mention "a.out" in
	output.
	* vax-nbsd-tdep.c (_initialize_vaxnbsd_tdep): Adjust.
	* vax-obsd-tdep.c: Delete file.

1 files changed, 6 insertions, 195 deletions

diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index cfc4ed0..ed3511f 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -144,10 +144,6 @@ static unsigned int next_file_string_table_offset;
 
 static int symfile_relocatable = 0;
 
-/* If this is nonzero, N_LBRAC, N_RBRAC, and N_SLINE entries are
-   relative to the function start address.  */
-
-static int block_address_function_relative = 0;
 
 /* The lowest text address we have yet encountered.  This is needed
    because in an a.out file, there is no header field which tells us
@@ -262,9 +258,6 @@ static void dbx_read_symtab (struct partial_symtab *self,
 
 static void dbx_psymtab_to_symtab_1 (struct objfile *, struct partial_symtab *);
 
-static void read_dbx_dynamic_symtab (minimal_symbol_reader &reader,
-				     struct objfile *objfile);
-
 static void read_dbx_symtab (minimal_symbol_reader &, struct objfile *);
 
 static void free_bincl_list (struct objfile *);
@@ -534,18 +527,6 @@ dbx_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
 
   symfile_relocatable = bfd_get_file_flags (sym_bfd) & HAS_RELOC;
 
-  /* This is true for Solaris (and all other systems which put stabs
-     in sections, hopefully, since it would be silly to do things
-     differently from Solaris), and false for SunOS4 and other a.out
-     file formats.  */
-  block_address_function_relative =
-    ((startswith (bfd_get_target (sym_bfd), "elf"))
-     || (startswith (bfd_get_target (sym_bfd), "som"))
-     || (startswith (bfd_get_target (sym_bfd), "coff"))
-     || (startswith (bfd_get_target (sym_bfd), "pe"))
-     || (startswith (bfd_get_target (sym_bfd), "epoc-pe"))
-     || (startswith (bfd_get_target (sym_bfd), "nlm")));
-
   val = bfd_seek (sym_bfd, DBX_SYMTAB_OFFSET (objfile), SEEK_SET);
   if (val < 0)
     perror_with_name (objfile_name (objfile));
@@ -566,10 +547,6 @@ dbx_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
 
   read_dbx_symtab (reader, objfile);
 
-  /* Add the dynamic symbols.  */
-
-  read_dbx_dynamic_symtab (reader, objfile);
-
   /* Install any minimal symbols that have been collected as the current
      minimal symbols for this objfile.  */
 
@@ -976,144 +953,6 @@ set_namestring (struct objfile *objfile, const struct internal_nlist *nlist)
   return namestring;
 }
 
-/* Scan a SunOs dynamic symbol table for symbols of interest and
-   add them to the minimal symbol table.  */
-
-static void
-read_dbx_dynamic_symtab (minimal_symbol_reader &reader,
-			 struct objfile *objfile)
-{
-  bfd *abfd = objfile->obfd;
-  struct cleanup *back_to;
-  int counter;
-  long dynsym_size;
-  long dynsym_count;
-  asymbol **dynsyms;
-  asymbol **symptr;
-  arelent **relptr;
-  long dynrel_size;
-  long dynrel_count;
-  arelent **dynrels;
-  CORE_ADDR sym_value;
-  const char *name;
-
-  /* Check that the symbol file has dynamic symbols that we know about.
-     bfd_arch_unknown can happen if we are reading a sun3 symbol file
-     on a sun4 host (and vice versa) and bfd is not configured
-     --with-target=all.  This would trigger an assertion in bfd/sunos.c,
-     so we ignore the dynamic symbols in this case.  */
-  if (bfd_get_flavour (abfd) != bfd_target_aout_flavour
-      || (bfd_get_file_flags (abfd) & DYNAMIC) == 0
-      || bfd_get_arch (abfd) == bfd_arch_unknown)
-    return;
-
-  dynsym_size = bfd_get_dynamic_symtab_upper_bound (abfd);
-  if (dynsym_size < 0)
-    return;
-
-  dynsyms = (asymbol **) xmalloc (dynsym_size);
-  back_to = make_cleanup (xfree, dynsyms);
-
-  dynsym_count = bfd_canonicalize_dynamic_symtab (abfd, dynsyms);
-  if (dynsym_count < 0)
-    {
-      do_cleanups (back_to);
-      return;
-    }
-
-  /* Enter dynamic symbols into the minimal symbol table
-     if this is a stripped executable.  */
-  if (bfd_get_symcount (abfd) <= 0)
-    {
-      symptr = dynsyms;
-      for (counter = 0; counter < dynsym_count; counter++, symptr++)
-	{
-	  asymbol *sym = *symptr;
-	  asection *sec;
-	  int type;
-
-	  sec = bfd_get_section (sym);
-
-	  /* BFD symbols are section relative.  */
-	  sym_value = sym->value + sec->vma;
-
-	  if (bfd_get_section_flags (abfd, sec) & SEC_CODE)
-	    {
-	      type = N_TEXT;
-	    }
-	  else if (bfd_get_section_flags (abfd, sec) & SEC_DATA)
-	    {
-	      type = N_DATA;
-	    }
-	  else if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
-	    {
-	      type = N_BSS;
-	    }
-	  else
-	    continue;
-
-	  if (sym->flags & BSF_GLOBAL)
-	    type |= N_EXT;
-
-	  record_minimal_symbol (reader, bfd_asymbol_name (sym), sym_value,
-				 type, objfile);
-	}
-    }
-
-  /* Symbols from shared libraries have a dynamic relocation entry
-     that points to the associated slot in the procedure linkage table.
-     We make a mininal symbol table entry with type mst_solib_trampoline
-     at the address in the procedure linkage table.  */
-  dynrel_size = bfd_get_dynamic_reloc_upper_bound (abfd);
-  if (dynrel_size < 0)
-    {
-      do_cleanups (back_to);
-      return;
-    }
-
-  dynrels = (arelent **) xmalloc (dynrel_size);
-  make_cleanup (xfree, dynrels);
-
-  dynrel_count = bfd_canonicalize_dynamic_reloc (abfd, dynrels, dynsyms);
-  if (dynrel_count < 0)
-    {
-      do_cleanups (back_to);
-      return;
-    }
-
-  for (counter = 0, relptr = dynrels;
-       counter < dynrel_count;
-       counter++, relptr++)
-    {
-      arelent *rel = *relptr;
-      CORE_ADDR address = rel->address;
-
-      switch (bfd_get_arch (abfd))
-	{
-	case bfd_arch_sparc:
-	  if (rel->howto->type != RELOC_JMP_SLOT)
-	    continue;
-	  break;
-	case bfd_arch_m68k:
-	  /* `16' is the type BFD produces for a jump table relocation.  */
-	  if (rel->howto->type != 16)
-	    continue;
-
-	  /* Adjust address in the jump table to point to
-	     the start of the bsr instruction.  */
-	  address -= 2;
-	  break;
-	default:
-	  continue;
-	}
-
-      name = bfd_asymbol_name (*rel->sym_ptr_ptr);
-      reader.record (name, address, mst_solib_trampoline);
-    }
-
-  do_cleanups (back_to);
-}
-
 static CORE_ADDR
 find_stab_function_addr (char *namestring, const char *filename,
 			 struct objfile *objfile)
@@ -2688,14 +2527,6 @@ process_one_symbol (int type, int desc, CORE_ADDR valu, char *name,
      source file.  Used to detect the SunPRO solaris compiler.  */
   static int n_opt_found;
 
-  if (!block_address_function_relative)
-    {
-      /* N_LBRAC, N_RBRAC and N_SLINE entries are not relative to the
-	 function start address, so just use the text offset.  */
-      function_start_offset =
-	ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
-    }
-
   /* Something is wrong if we see real data before seeing a source
      file name.  */
 
@@ -2751,8 +2582,7 @@ process_one_symbol (int type, int desc, CORE_ADDR valu, char *name,
 
 	  /* May be switching to an assembler file which may not be using
 	     block relative stabs, so reset the offset.  */
-	  if (block_address_function_relative)
-	    function_start_offset = 0;
+	  function_start_offset = 0;
 
 	  break;
 	}
@@ -2774,13 +2604,7 @@ process_one_symbol (int type, int desc, CORE_ADDR valu, char *name,
       if (n_opt_found && desc == 1)
 	break;
 
-      if (block_address_function_relative)
-	/* Relocate for Sun ELF acc fn-relative syms.  */
-	valu += function_start_offset;
-      else
-	/* On most machines, the block addresses are relative to the
-	   N_SO, the linker did not relocate them (sigh).  */
-	valu += last_source_start_addr;
+      valu += function_start_offset;
 
       push_context (desc, valu);
       break;
@@ -2793,13 +2617,7 @@ process_one_symbol (int type, int desc, CORE_ADDR valu, char *name,
       if (n_opt_found && desc == 1)
 	break;
 
-      if (block_address_function_relative)
-	/* Relocate for Sun ELF acc fn-relative syms.  */
-	valu += function_start_offset;
-      else
-	/* On most machines, the block addresses are relative to the
-	   N_SO, the linker did not relocate them (sigh).  */
-	valu += last_source_start_addr;
+      valu += function_start_offset;
 
       if (context_stack_depth <= 0)
 	{
@@ -2894,8 +2712,7 @@ process_one_symbol (int type, int desc, CORE_ADDR valu, char *name,
       if (*name == '\000')
 	break;
 
-      if (block_address_function_relative)
-	function_start_offset = 0;
+      function_start_offset = 0;
 
       start_stabs ();
       start_symtab (objfile, name, NULL, valu);
@@ -3113,14 +2930,8 @@ process_one_symbol (int type, int desc, CORE_ADDR valu, char *name,
 		    valu = minsym_valu;
 		}
 
-	      if (block_address_function_relative)
-		/* For Solaris 2 compilers, the block addresses and
-		   N_SLINE's are relative to the start of the
-		   function.  On normal systems, and when using GCC on
-		   Solaris 2, these addresses are just absolute, or
-		   relative to the N_SO, depending on
-		   BLOCK_ADDRESS_ABSOLUTE.  */
-		function_start_offset = valu;
+	      /* These addresses are absolute.  */
+	      function_start_offset = valu;
 
 	      within_function = 1;