PowerPC64 __tls_get_addr_desc

This implements register saving and restoring in the __tls_get_addr
call stub, so that when glibc supports the optimized tls call stub gcc
can generate code that assumes only r0, r12 and of course r3 are
changed on a __tls_get_addr call.  When gcc expects __tls_get_addr
calls to preserve registers the call will be to __tls_get_addr_desc,
which will be translated by the linker to a call to __tls_get_addr_opt.

bfd/
	* elf64-ppc.h (struct ppc64_elf_params): Add no_tls_get_addr_regsave.
	* elf64-ppc.c (struct ppc_link_hash_table): Add tga_desc and
	tga_desc_fd.
	(is_tls_get_addr): Match tga_desc and tga_desc_df too.
	(STDU_R1_0R1, ADDI_R1_R1): Define.
	(tls_get_addr_prologue, tls_get_addr_epilogue): New functions.
	(ppc64_elf_tls_setup): Set up tga_desc and tga_desc_fd.  Indirect
	tga_desc_fd to opt_fd, and tga_desc to opt.  Set
	no_tls_get_addr_regsave.
	(branch_reloc_hash_match): Add hash3 and hash4.
	(ppc64_elf_tls_optimize): Handle tga_desc_fd and tga_desc too.
	(ppc64_elf_size_dynamic_sections): Likewise.
	(ppc64_elf_relocate_section): Likewise.
	(plt_stub_size, build_plt_stub): Likewise.  Size regsave
	__tls_get_addr stub.
	(build_tls_get_addr_stub): Build regsave __tls_get_addr stub and
	eh_frame.
	(ppc_size_one_stub): Handle tga_desc_fd and tga_desc too.  Size
	eh_frame for regsave __tls_get_addr.
gas/
	* config/tc-ppc.c (parse_tls_arg): Handle tls arg for
	__tls_get_addr_desc and __tls_get_addr_opt.
ld/
	* emultempl/ppc64elf.em (ppc64_opt, PARSE_AND_LIST_LONGOPTS),
	(PARSE_AND_LIST_OPTIONS, PARSE_AND_LIST_ARGS_CASES): Support
	--tls-get-addr-regsave and --no-tls-get-addr-regsave.
	(params): Init new field.
	* ld.texi (--tls-get-addr-regsave, --no-tls-get-addr-regsave):
	Document.
	* testsuite/ld-powerpc/tlsdesc.s,
	* testsuite/ld-powerpc/tlsdesc.d,
	* testsuite/ld-powerpc/tlsdesc.wf,
	* testsuite/ld-powerpc/tlsdesc2.d,
	* testsuite/ld-powerpc/tlsdesc2.wf,
	* testsuite/ld-powerpc/tlsexenors.d,
	* testsuite/ld-powerpc/tlsexenors.r,
	* testsuite/ld-powerpc/tlsexers.d,
	* testsuite/ld-powerpc/tlsexers.r,
	* testsuite/ld-powerpc/tlsexetocnors.d,
	* testsuite/ld-powerpc/tlsexetocrs.d,
	* testsuite/ld-powerpc/tlsexetocrs.r,
	* testsuite/ld-powerpc/tlsopt6.d,
	* testsuite/ld-powerpc/tlsopt6.wf: New.
	* testsuite/ld-powerpc/powerpc.exp: Run new tests.

1 files changed, 19 insertions, 1 deletions

diff --git a/ld/emultempl/ppc64elf.em b/ld/emultempl/ppc64elf.em
index caa4f82..6633f81 100644
--- a/ld/emultempl/ppc64elf.em
+++ b/ld/emultempl/ppc64elf.em
@@ -36,7 +36,7 @@ static void ppc_layout_sections_again (void);
 static struct ppc64_elf_params params = { NULL,
 					  &ppc_add_stub_section,
 					  &ppc_layout_sections_again,
-					  1, -1, 0,
+					  1, -1, -1, 0,
 					  ${DEFAULT_PLT_STATIC_CHAIN-0}, -1, 5,
 					  -1, 0, -1, -1, 0};
 
@@ -694,6 +694,8 @@ enum ppc64_opt
   OPTION_NO_TLS_OPT,
   OPTION_TLS_GET_ADDR_OPT,
   OPTION_NO_TLS_GET_ADDR_OPT,
+  OPTION_TLS_GET_ADDR_REGSAVE,
+  OPTION_NO_TLS_GET_ADDR_REGSAVE,
   OPTION_NO_OPD_OPT,
   OPTION_NO_INLINE_OPT,
   OPTION_NO_TOC_OPT,
@@ -722,6 +724,8 @@ PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
   { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
   { "tls-get-addr-optimize", no_argument, NULL, OPTION_TLS_GET_ADDR_OPT },
   { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
+  { "tls-get-addr-regsave", no_argument, NULL, OPTION_TLS_GET_ADDR_REGSAVE },
+  { "no-tls-get-addr-regsave", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_REGSAVE},
   { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
   { "no-inline-optimize", no_argument, NULL, OPTION_NO_INLINE_OPT },
   { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT },
@@ -798,6 +802,12 @@ PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
   --no-tls-get-addr-optimize  Don'\''t use a special __tls_get_addr call\n"
 		   ));
   fprintf (file, _("\
+  --tls-get-addr-regsave      Force register save __tls_get_addr stub\n"
+		   ));
+  fprintf (file, _("\
+  --no-tls-get-addr-regsave   Don'\''t use register save __tls_get_addr stub\n"
+		   ));
+  fprintf (file, _("\
   --no-opd-optimize           Don'\''t optimize the OPD section\n"
 		   ));
   fprintf (file, _("\
@@ -905,6 +915,14 @@ PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
       params.tls_get_addr_opt = 0;
       break;
 
+    case OPTION_TLS_GET_ADDR_REGSAVE:
+      params.no_tls_get_addr_regsave = 0;
+      break;
+
+    case OPTION_NO_TLS_GET_ADDR_REGSAVE:
+      params.no_tls_get_addr_regsave = 1;
+      break;
+
     case OPTION_NO_OPD_OPT:
       no_opd_opt = 1;
       break;