__tls_get_addr_opt stub eh_frame info

Since the __tls_get_addr_opt stub saves LR and makes a call, eh_frame
info should be generated to describe how to unwind through the stub.

The patch also changes the way the backend iterates over stubs, from
looking at all sections in stub_bfd to which all dynamic sections are
attached as well, to iterating over the group list, which gets just
the stub sections.  Most binaries will have just one or two stub
groups, so this is a little faster.

bfd/
	* elf64-ppc.c (struct map_stub): Add tls_get_addr_opt_bctrl.
	(stub_eh_frame_size): New function.
	(ppc_size_one_stub): Set group tls_get_addr_opt_bctrl.
	(group_sections): Init group tls_get_addr_opt_bctrl.
	(ppc64_elf_size_stubs): Update sizing and initialization of
	.eh_frame.  Iteration over stubs via group list.
	(ppc64_elf_build_stubs): Iterate over stubs via group list.
	(ppc64_elf_finish_dynamic_sections): Update finalization of
	.eh_frame.
ld/
	* testsuite/ld-powerpc/tlsopt5.s: Add cfi.
	* testsuite/ld-powerpc/tlsopt5.d: Update.
	* testsuite/ld-powerpc/tlsopt5.wf: New file.
	* testsuite/ld-powerpc/powerpc.exp: Perform new tlsopt5 test.

4 files changed, 37 insertions, 3 deletions

diff --git a/ld/testsuite/ld-powerpc/powerpc.exp b/ld/testsuite/ld-powerpc/powerpc.exp
index 9816eff..6249ccb 100644
--- a/ld/testsuite/ld-powerpc/powerpc.exp
+++ b/ld/testsuite/ld-powerpc/powerpc.exp
@@ -211,7 +211,7 @@ set ppc64elftests {
     {"TLS DLL" "-shared -melf64ppc --version-script tlsdll.ver" "" "-a64" {tlsdll.s}
      {} "tlsdll.so"}
     {"TLS opt 5" "-melf64ppc -shared --gc-sections --no-plt-localentry tmpdir/tlsdll.so" "" "-a64"  {tlsopt5.s}
-     {{objdump -dr tlsopt5.d}}
+     {{objdump -dr tlsopt5.d} {readelf -wf tlsopt5.wf}}
       "tlsopt5"}
     {"sym@tocbase" "-shared -melf64ppc" "" "-a64" {symtocbase-1.s symtocbase-2.s}
 	{{objdump -dj.data symtocbase.d}} "symtocbase.so"}
diff --git a/ld/testsuite/ld-powerpc/tlsopt5.d b/ld/testsuite/ld-powerpc/tlsopt5.d
index 7a74679..3c85185 100644
--- a/ld/testsuite/ld-powerpc/tlsopt5.d
+++ b/ld/testsuite/ld-powerpc/tlsopt5.d
@@ -31,8 +31,8 @@ Disassembly of section \.text:
 .*:	(08 80 62 38|38 62 80 08) 	addi    r3,r2,-32760
 .*:	(b9 ff ff 4b|4b ff ff b9) 	bl      .*
 .*:	(00 00 00 60|60 00 00 00) 	nop
-.*:	(f8 01 01 00|00 00 00 00) 	.*
-.*:	(00 00 00 00|00 01 01 f8) 	.*
+.*:	(f8 02 01 00|00 00 00 00) 	.*
+.*:	(00 00 00 00|00 01 02 f8) 	.*
 
 0+318 <__glink_PLTresolve>:
 .*:	(a6 02 08 7c|7c 08 02 a6) 	mflr    r0
diff --git a/ld/testsuite/ld-powerpc/tlsopt5.s b/ld/testsuite/ld-powerpc/tlsopt5.s
index 598bbd9..70902ef 100644
--- a/ld/testsuite/ld-powerpc/tlsopt5.s
+++ b/ld/testsuite/ld-powerpc/tlsopt5.s
@@ -1,5 +1,7 @@
  .globl _start
 _start:
+ .cfi_startproc
  addi 3,2,gd@got@tlsgd
  bl __tls_get_addr(gd@tlsgd)
  nop
+ .cfi_endproc
diff --git a/ld/testsuite/ld-powerpc/tlsopt5.wf b/ld/testsuite/ld-powerpc/tlsopt5.wf
new file mode 100644
index 0000000..05ef7e0
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/tlsopt5.wf
@@ -0,0 +1,32 @@
+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+14 0+18 FDE cie=0+ pc=0+2c0\.\.0+304
+  DW_CFA_advance_loc: 48 to 0+2f0
+  DW_CFA_offset_extended_sf: r65 at cfa\+8
+  DW_CFA_advance_loc: 16 to 0+300
+  DW_CFA_restore_extended: r65
+
+0+2c 0+18 0+30 FDE cie=0+ pc=0+318\.\.0+354
+  DW_CFA_advance_loc: 4 to 0+31c
+  DW_CFA_register: r65 in r0
+  DW_CFA_advance_loc: 28 to 0+338
+  DW_CFA_restore_extended: r65
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+0+48 0+10 0+4c FDE cie=0+ pc=0+304\.\.0+310
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop