Handle copy relocations

In ELF, if a data symbol is defined in a shared library and used by
the main program, it will be subject to a "copy relocation".  In this
scenario, the main program has a copy of the symbol in question, and a
relocation that tells ld.so to copy the data from the shared library.
Then the symbol in the main program is used to satisfy all references.

This patch changes gdb to handle this scenario.  Data symbols coming
from ELF shared libraries get a special flag that indicates that the
symbol's address may be subject to copy relocation.

I looked briefly into handling copy relocations by looking at the
actual relocations in the main program, but this seemed difficult to
do with BFD.

Note that no caching is done here.  Perhaps this could be changed if
need be; I wanted to avoid possible problems with either objfile
lifetimes and changes, or conflicts with the long-term (vapor-ware)
objfile splitting project.

gdb/ChangeLog
2019-10-02  Tom Tromey  <tromey@adacore.com>

	* symmisc.c (dump_msymbols): Don't use MSYMBOL_VALUE_ADDRESS.
	* ada-lang.c (lesseq_defined_than): Handle
	LOC_STATIC.
	* dwarf2read.c (dwarf2_per_objfile): Add can_copy
	parameter.
	(dwarf2_has_info): Likewise.
	(new_symbol): Set maybe_copied on symbol when
	appropriate.
	* dwarf2read.h (dwarf2_per_objfile): Add can_copy
	parameter.
	<can_copy>: New member.
	* elfread.c (record_minimal_symbol): Set maybe_copied
	on symbol when appropriate.
	(elf_symfile_read): Update call to dwarf2_has_info.
	* minsyms.c (lookup_minimal_symbol_linkage): New
	function.
	* minsyms.h (lookup_minimal_symbol_linkage): Declare.
	* symtab.c (get_symbol_address, get_msymbol_address):
	New functions.
	* symtab.h (get_symbol_address, get_msymbol_address):
	Declare.
	(SYMBOL_VALUE_ADDRESS, MSYMBOL_VALUE_ADDRESS): Handle
	maybe_copied.
	(struct symbol, struct minimal_symbol) <maybe_copied>:
	New member.

1 files changed, 11 insertions, 5 deletions

diff --git a/gdb/elfread.c b/gdb/elfread.c
index a3d17e5..d2a7bcf 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -203,10 +203,16 @@ record_minimal_symbol (minimal_symbol_reader &reader,
       || ms_type == mst_text_gnu_ifunc)
     address = gdbarch_addr_bits_remove (gdbarch, address);
 
-  return reader.record_full (name, name_len, copy_name, address,
-			     ms_type,
-			     gdb_bfd_section_index (objfile->obfd,
-						    bfd_section));
+  struct minimal_symbol *result
+    = reader.record_full (name, name_len, copy_name, address,
+			  ms_type,
+			  gdb_bfd_section_index (objfile->obfd,
+						 bfd_section));
+  if ((objfile->flags & OBJF_MAINLINE) == 0
+      && (ms_type == mst_data || ms_type == mst_bss))
+    result->maybe_copied = 1;
+
+  return result;
 }
 
 /* Read the symbol table of an ELF file.
@@ -1239,7 +1245,7 @@ elf_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
 				bfd_section_size (str_sect));
     }
 
-  if (dwarf2_has_info (objfile, NULL))
+  if (dwarf2_has_info (objfile, NULL, true))
     {
       dw_index_kind index_kind;