PowerPC64 tls_get_addr_desc static support

This provides a linker generated __tls_get_addr_desc wrapper function
preserving registers around a __tls_get_addr call.  The idea being to
support __tls_get_addr_desc without requiring a glibc update.

bfd/
	* elf64-ppc.c (struct ppc_link_hash_table): Add tga_group.
	(ppc64_elf_archive_symbol_lookup): Extract __tls_get_addr_opt for
	__tls_get_addr_desc.
	(ppc64_elf_size_stubs): Add section for linker generated
	__tls_get_addr_desc wrapper function.  Loop at least once if
	generating this function.
	(emit_tga_desc, emit_tga_desc_eh_frame): New functions.
	(ppc64_elf_build_stubs): Generate __tls_get_addr_desc.
ld/
	* testsuite/ld-powerpc/tlsdesc3.d,
	* testsuite/ld-powerpc/tlsdesc3.wf,
	* testsuite/ld-powerpc/tlsdesc4.d,
	* testsuite/ld-powerpc/tlsdesc4.s,
	* testsuite/ld-powerpc/tlsdesc4.wf: New tests.
	* testsuite/ld-powerpc/powerpc.exp: Run them.

1 files changed, 43 insertions, 0 deletions

diff --git a/ld/testsuite/ld-powerpc/tlsdesc3.wf b/ld/testsuite/ld-powerpc/tlsdesc3.wf
new file mode 100644
index 0000000..af5a6b4
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/tlsdesc3.wf
@@ -0,0 +1,43 @@
+Contents of the \.eh_frame section:
+
+0+ 0+10 0+ CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 65
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r1 ofs 0
+
+0+14 0+34 0+18 FDE cie=0+ pc=0+10000100\.\.0+10000160
+  DW_CFA_advance_loc: 44 to 0+1000012c
+  DW_CFA_def_cfa_offset: 96
+  DW_CFA_offset_extended_sf: r65 at cfa\+16
+  DW_CFA_offset: r4 at cfa-64
+  DW_CFA_offset: r5 at cfa-56
+  DW_CFA_offset: r6 at cfa-48
+  DW_CFA_offset: r7 at cfa-40
+  DW_CFA_offset: r8 at cfa-32
+  DW_CFA_offset: r9 at cfa-24
+  DW_CFA_offset: r10 at cfa-16
+  DW_CFA_offset: r11 at cfa-8
+  DW_CFA_advance_loc: 40 to 0+10000154
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_restore: r4
+  DW_CFA_restore: r5
+  DW_CFA_restore: r6
+  DW_CFA_restore: r7
+  DW_CFA_restore: r8
+  DW_CFA_restore: r9
+  DW_CFA_restore: r10
+  DW_CFA_restore: r11
+  DW_CFA_advance_loc: 8 to 0+1000015c
+  DW_CFA_restore_extended: r65
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+0+4c 0+10 0+50 FDE cie=0+ pc=0+10000164\.\.0+10000170
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop