Add .abiversion related support for ELFv2

Defines bits in ELF e_flags to differentiate ELFv2 objects from ELFv2,
adds .abiversion directive to explicitly choose the ABI, and code to
check and automatically select ABI.

include/elf/
	* ppc64.h (EF_PPC64_ABI): Define.
bfd/
	* elf64-ppc.c (abiversion, set_abiversion): New functions.
	(ppc64_elf_get_synthetic_symtab): Handle ELFv2 objects without .opd.
	(struct ppc_link_hash_table): Add opd_abi.
	(ppc64_elf_check_relocs): Check no .opd with ELFv2.
	(ppc64_elf_merge_private_bfd_data): New function.
	(ppc64_elf_print_private_bfd_data): New function.
	(ppc64_elf_tls_setup): Set htab->opd_abi.
	(ppc64_elf_size_dynamic_sections): Don't emit OPD related dynamic
	tags for ELFv2.
	(ppc_build_one_stub): Use R_PPC64_IRELATIVE for ELFv2 ifunc.
	(ppc64_elf_finish_dynamic_symbol): Likewise
binutils/
	* readelf.c (get_machine_flags): Display ABI version for EM_PPC64.
gas/
	* config/tc-ppc.c: Include elf/ppc64.h.
	(ppc_abiversion): New variable.
	(md_pseudo_table): Add .abiversion.
	(ppc_elf_abiversion, ppc_elf_end): New functions.
	* config/tc-ppc.h (md_end): Define.

2 files changed, 42 insertions, 0 deletions

diff --git a/gas/config/tc-ppc.c b/gas/config/tc-ppc.c
index 34afc91..c249cec 100644
--- a/gas/config/tc-ppc.c
+++ b/gas/config/tc-ppc.c
@@ -29,6 +29,7 @@
 
 #ifdef OBJ_ELF
 #include "elf/ppc.h"
+#include "elf/ppc64.h"
 #include "dwarf2dbg.h"
 #endif
 
@@ -133,6 +134,7 @@ static void ppc_vbyte (int);
 static void ppc_elf_cons (int);
 static void ppc_elf_rdata (int);
 static void ppc_elf_lcomm (int);
+static void ppc_elf_abiversion (int);
 #endif
 
 #ifdef TE_PE
@@ -203,6 +205,9 @@ unsigned long nop_limit = 4;
 ppc_cpu_t ppc_cpu = 0;
 ppc_cpu_t sticky = 0;
 
+/* Value for ELF e_flags EF_PPC64_ABI.  */
+unsigned int ppc_abiversion = 0;
+
 /* Flags set on encountering toc relocs.  */
 enum {
   has_large_toc_reloc = 1,
@@ -261,6 +266,7 @@ const pseudo_typeS md_pseudo_table[] =
   { "rdata",	ppc_elf_rdata,	0 },
   { "rodata",	ppc_elf_rdata,	0 },
   { "lcomm",	ppc_elf_lcomm,	0 },
+  { "abiversion", ppc_elf_abiversion,	0 },
 #endif
 
 #ifdef TE_PE
@@ -2220,6 +2226,39 @@ ppc_elf_lcomm (int xxx ATTRIBUTE_UNUSED)
   demand_empty_rest_of_line ();
 }
 
+/* Pseudo op to set ABI version.  */
+static void
+ppc_elf_abiversion (int ignore ATTRIBUTE_UNUSED)
+{
+  expressionS exp;
+
+  expression (&exp);
+  if (exp.X_op == O_absent)
+    {
+      as_bad (_("missing expression in .abiversion directive"));
+      exp.X_op = O_constant;
+      exp.X_add_number = 0;
+    }
+
+  if (resolve_expression (&exp)
+      && exp.X_op == O_constant)
+    ppc_abiversion = exp.X_add_number;
+  else
+    as_bad (_(".abiversion expression does not evaluate to a constant"));
+  demand_empty_rest_of_line ();
+}
+
+/* Set ABI version in output file.  */
+void
+ppc_elf_end (void)
+{
+  if (ppc_obj64 && ppc_abiversion != 0)
+    {
+      elf_elfheader (stdoutput)->e_flags &= ~EF_PPC64_ABI;
+      elf_elfheader (stdoutput)->e_flags |= ppc_abiversion & EF_PPC64_ABI;
+    }
+}
+
 /* Validate any relocations emitted for -mrelocatable, possibly adding
    fixups for word relocations in writable segments, so we can adjust
    them at runtime.  */
diff --git a/gas/config/tc-ppc.h b/gas/config/tc-ppc.h
index 3dd3f81..6095416 100644
--- a/gas/config/tc-ppc.h
+++ b/gas/config/tc-ppc.h
@@ -238,6 +238,9 @@ extern void ppc_frob_file_before_adjust (void);
 #define tc_adjust_symtab() ppc_elf_adjust_symtab ()
 extern void ppc_elf_adjust_symtab (void);
 
+extern void ppc_elf_end (void);
+#define md_end ppc_elf_end
+
 #endif /* OBJ_ELF */
 
 #if defined (OBJ_ELF) || defined (OBJ_XCOFF)