PowerPC64 ELFv2 support for gold.

(cherry picked from commit b4f7960d5307fe4aad2126382df78f63696e96b3)

elfcpp/ChangeLog

 2013-11-15  Alan Modra  <amodra@gmail.com>
 
 	Apply mainline changes to 2.24
+	2013-10-30  Alan Modra  <amodra@gmail.com>
+	* powerpc.h (EF_PPC64_ABI): New enum constant.
+	(STO_PPC64_LOCAL_BIT, STO_PPC64_LOCAL_MASK): Likewise.
+	(ppc64_decode_local_entry): New function.
+	(ppc64_encode_local_entry): Likewise.
+
 	2013-10-30  Alan Modra  <amodra@gmail.com>
 	* powerpc.h (R_PPC64_ADDR16_HIGH, R_PPC64_ADDR16_HIGHA,
 	R_PPC64_TPREL16_HIGH, R_PPC64_TPREL16_HIGHA,

elfcpp/powerpc.h

 // powerpc.h -- ELF definitions specific to EM_PPC and EM_PPC64  -*- C++ -*-
 
-// Copyright 2008, 2010, 2012 Free Software Foundation, Inc.
+// Copyright 2008, 2010, 2012, 2013 Free Software Foundation, Inc.
 // Written by David S. Miller <davem@davemloft.net>.
 
 // This file is part of elfcpp.
@@ -214,6 +214,59 @@ enum
   EF_PPC_RELOCATABLE_LIB = 0x00008000, // PowerPC -mrelocatable-lib flag.  */
 };
 
+// e_flags values defined for powerpc64
+enum
+{
+  // ABI version
+  // 1 for original function descriptor using ABI,
+  // 2 for revised ABI without function descriptors,
+  // 0 for unspecified or not using any features affected by the differences.
+  EF_PPC64_ABI = 3
+};
+
+enum
+{
+  // The ELFv2 ABI uses three bits in the symbol st_other field of a
+  // function definition to specify the number of instructions between a
+  // function's global entry point and local entry point.
+  // The global entry point is used when it is necessary to set up the
+  // toc pointer (r2) for the function.  Callers must enter the global
+  // entry point with r12 set to the global entry point address.  On
+  // return from the function, r2 may have a different value to that
+  // which it had on entry.
+  // The local entry point is used when r2 is known to already be valid
+  // for the function.  There is no requirement on r12 when using the
+  // local entry point, and on return r2 will contain the same value as
+  // at entry.
+  // A value of zero in these bits means that the function has a single
+  // entry point with no requirement on r12 or r2, and that on return r2
+  // will contain the same value as at entry.
+  // Values of one and seven are reserved.
+
+  STO_PPC64_LOCAL_BIT = 5,
+  STO_PPC64_LOCAL_MASK = 0xE0
+};
+
+// 3 bit other field to bytes.
+static inline unsigned int
+ppc64_decode_local_entry(unsigned int other)
+{
+  return ((1 << other) >> 2) << 2;
+}
+
+// bytes to field value.
+static inline unsigned int
+ppc64_encode_local_entry(unsigned int val)
+{
+  return (val >= 4 * 4
+	  ? (val >= 8 * 4
+	     ? (val >= 16 * 4 ? 6 : 5)
+	     : 4)
+	  : (val >= 2 * 4
+	     ? 3
+	     : (val >= 1 * 4 ? 2 : 0)));
+}
+
 } // End namespace elfcpp.
 
 #endif // !defined(ELFCPP_POWERPC_H)

gold/ChangeLog

 2013-11-15  Alan Modra  <amodra@gmail.com>
 
 	Apply changes from mainline to 2.24
+	2013-10-30  Alan Modra  <amodra@gmail.com>
+	* powerpc.cc (Powerpc_relobj::abiversion, set_abiversion,
+	ppc64_local_entry_offset, ppc64_local_entry_offset,
+	do_read_symbols): New functions.
+	(Powerpc_relobj::e_flags_, st_other_): New vars.
+	(Powerpc_relobj::Powerpc_relobj): Call set_abiversion.
+	(Powerpc_dynobj::abiversion, set_abiversion): New functions.
+	(Powerpc_relobj::e_flags_): New var.
+	(Target_powerpc::first_plt_entry_offset, plt_entry_size): Inline
+	and adjust for ELFv2.
+	(Target_powerpc::abiversion, set_abiversion, stk_toc): New functions.
+	(Powerpc_relobj::do_find_special_sections): Check no .opd in ELFv2.
+	(Powerpc_dynobj::do_find_special_sections): Likewise.
+	(Target_powerpc::do_define_standard_symbols): Define ".TOC.".
+	(Target_powerpc::Branch_info::make_stub): Adjust stub destination
+	to ELFv2 local entry.
+	(Target_powerpc::do_relax): No thread safe barriers needed for
+	ELFv2.
+	(Output_data_plt_powerpc::initial_plt_entry_size_,
+	plt_entry_size): Delete.  Replace all uses with
+	first_plt_entry_offset() and plt_entry_size().
+	(Output_data_plt_powerpc::Output_data_plt_powerpc): Remove
+	reserved_size parm.  Update callers.
+	(Output_data_plt_powerpc::entry_count): Update.
+	(Output_data_plt_powerpc::first_plt_entry_offset): Make private
+	and use Target_powerpc::first_plt_entry_offset().
+	(Output_data_plt_powerpc::get_plt_entry_size): Similarly and
+	rename to plt_entry_size.
+	(Output_data_plt_powerpc::add_ifunc_entry,
+	add_local_ifunc_entry): Adjust reloc for ELFv2.
+	(glink_eh_frame_fde_64): Rename to glink_eh_frame_fde_64v1.
+	(glink_eh_frame_fde_64v2): New.
+	(Stub_table::plt_call_size): Support ELFv2 sizing.
+	(Output_data_glink::add_eh_frame): Use the new FDE.
+	(Output_data_glink::set_final_data_size): Adjust for ELFv2 glink.
+	(Stub_table::do_write): Write ELFv2 stubs and glink.
+	(Target_powerpc::Relocate::relocate): Replaces nop after call
+	with ld 2,24(1) and adjust local offset destination for ELFv2.
+
 	2013-10-30  Alan Modra  <amodra@gmail.com>
 	* powerpc.cc (Target_powerpc::Scan::check_non_pic): Handle new relocs.
 	(Target_powerpc::Scan::global, local): Likewise.