PowerPC TLS miscounting PLT for __tls_get_addr

ppc*_elf_tls_optimize decrements the PLT refcount for __tls_get_addr
when a GD or LD sequence can be optimized.  Without tls marker relocs
this must be done when processing the argument setup relocations.
With marker relocs it's better done when processing the marker reloc.
But don't count them both ways.

Seen as "unresolvable R_PPC_REL24 relocation against symbol
`__tls_get_addr_opt'" (and other branch relocs).

	* elf32-ppc.c (ppc_elf_tls_optimize): Don't process R_PPC_TLSLD
	with non-local symbol.  Don't double count __tls_get_addr calls
	with marker relocs.
	* elf64-ppc.c (ppc64_elf_tls_optimize): Likewise.

(cherry picked from commit 7d04a20ae4af0f1f6e75ec642413c27de4c1e1b8)

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 5e9d22b..cb126d3 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -2,6 +2,12 @@
 
        Apply from master
        2019-10-07  Alan Modra  <amodra@gmail.com>
+       * elf32-ppc.c (ppc_elf_tls_optimize): Don't process R_PPC_TLSLD
+       with non-local symbol.  Don't double count __tls_get_addr calls
+       with marker relocs.
+       * elf64-ppc.c (ppc64_elf_tls_optimize): Likewise.
+
+       2019-10-07  Alan Modra  <amodra@gmail.com>
        * elf32-ppc.c (nomark_tls_get_addr): Rename from has_tls_get_addr_call
        throughout.
        * elf64-ppc.c (nomark_tls_get_addr): Likewise.

diff --git a/bfd/elf32-ppc.c b/bfd/elf32-ppc.c
index 6fdc105..565a334 100644 (file)
--- a/bfd/elf32-ppc.c
+++ b/bfd/elf32-ppc.c
@@ -4530,8 +4530,11 @@ ppc_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED,
                      else
                        continue;
 
-                   case R_PPC_TLSGD:
                    case R_PPC_TLSLD:
+                     if (!is_local)
+                       continue;
+                     /* Fall through.  */
+                   case R_PPC_TLSGD:
                      if (rel + 1 < relend
                          && is_plt_seq_reloc (ELF32_R_TYPE (rel[1].r_info)))
                        {
@@ -4633,7 +4636,7 @@ ppc_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED,
                          != (TLS_TLS | TLS_MARK)))
                    continue;
 
-                 if (expecting_tls_get_addr)
+                 if (expecting_tls_get_addr == 1 + !sec->nomark_tls_get_addr)
                    {
                      struct plt_entry *ent;
                      bfd_vma addend = 0;
@@ -4646,10 +4649,9 @@ ppc_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED,
                                          got2, addend);
                      if (ent != NULL && ent->plt.refcount > 0)
                        ent->plt.refcount -= 1;
-
-                     if (expecting_tls_get_addr == 2)
-                       continue;
                    }
+                 if (tls_clear == 0)
+                   continue;
 
                  if (tls_set == 0)
                    {

diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index da997c7..731f1ca 100644 (file)
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -7880,8 +7880,11 @@ ppc64_elf_tls_optimize (struct bfd_link_info *info)
                        }
                      continue;
 
-                   case R_PPC64_TLSGD:
                    case R_PPC64_TLSLD:
+                     if (!is_local)
+                       continue;
+                     /* Fall through.  */
+                   case R_PPC64_TLSGD:
                      if (rel + 1 < relend
                          && is_plt_seq_reloc (ELF64_R_TYPE (rel[1].r_info)))
                        {
@@ -8066,7 +8069,7 @@ ppc64_elf_tls_optimize (struct bfd_link_info *info)
                          != (TLS_TLS | TLS_MARK)))
                    continue;
 
-                 if (expecting_tls_get_addr)
+                 if (expecting_tls_get_addr == 1 + !sec->nomark_tls_get_addr)
                    {
                      struct plt_entry *ent = NULL;