PR30697, ppc32 mix of local-dynamic and global-dynamic TLS

This fixes miscounting of dynamic relocations on GOT entries when
a) there are both local-dynamic and global-dynamic tls accesss for a
   given symbol, and
b) the symbol is global with non-default visibility, and
c) the __tls_get_addr calls aren't optimised away.

	PR 30697
bfd/
	* elf32-ppc.c (allocate_dynrelocs): Correct local-dynamic
	reloc count.
ld/
	* testsuite/ld-powerpc/tls32ldgd.d,
	* testsuite/ld-powerpc/tls32ldgd.s: New test.
	* testsuite/ld-powerpc/powerpc.exp: Run it.

Author: amodra

bfd/elf32-ppc.c

@@ -5126,13 +5126,12 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
 	  && eh->has_addr16_lo
 	  && htab->params->pic_fixup > 0))
     {
-      unsigned int need;
-
       /* Make sure this symbol is output as a dynamic symbol.  */
       if (!ensure_undef_dynamic (info, &eh->elf))
 	return false;
 
-      need = 0;
+      unsigned int need = got_entries_needed (eh->tls_mask);
+      unsigned int rel_need = need * sizeof (Elf32_External_Rela) / 4;
       if ((eh->tls_mask & (TLS_TLS | TLS_LD)) == (TLS_TLS | TLS_LD))
 	{
 	  if (SYMBOL_REFERENCES_LOCAL (info, &eh->elf))
@@ -5141,9 +5140,11 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
 	       a local dynamic reloc against a non-local symbol.  */
 	    htab->tlsld_got.refcount += 1;
 	  else
-	    need += 8;
+	    {
+	      need += 8;
+	      rel_need += sizeof (Elf32_External_Rela);
+	    }
 	}
-      need += got_entries_needed (eh->tls_mask);
       if (need == 0)
 	eh->elf.got.offset = (bfd_vma) -1;
       else
@@ -5161,13 +5162,10 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
 	    {
 	      asection *rsec;
 
-	      need *= sizeof (Elf32_External_Rela) / 4;
-	      if ((eh->tls_mask & (TLS_TLS | TLS_LD)) == (TLS_TLS | TLS_LD))
-		need -= sizeof (Elf32_External_Rela);
 	      rsec = htab->elf.srelgot;
 	      if (eh->elf.type == STT_GNU_IFUNC)
 		rsec = htab->elf.irelplt;
-	      rsec->size += need;
+	      rsec->size += rel_need;
 	    }
 	}
     }

ld/testsuite/ld-powerpc/powerpc.exp

@@ -522,5 +522,6 @@ run_dump_test "non-contiguous-powerpc"
 
 run_dump_test "tprel32"
 run_dump_test "tprelbad"
+run_dump_test tls32ldgd
 
 run_dump_test "undefweak"

ld/testsuite/ld-powerpc/tls32ldgd.d

@@ -0,0 +1,13 @@
+#as: -a32
+#ld: -shared -melf32ppc
+#readelf: -rW
+
+Relocation section '\.rela\.dyn' at offset .* contains 3 entries:
+ Offset +Info +Type +Sym\. Value +Symbol's Name \+ Addend
+.* +00000044 R_PPC_DTPMOD32 +0
+.* +0000004e R_PPC_DTPREL32 +0
+.* +00000044 R_PPC_DTPMOD32 +0
+
+Relocation section '\.rela\.plt' at offset .* contains 1 entry:
+ Offset +Info +Type +Sym\. Value +Symbol's Name \+ Addend
+.* +00000215 R_PPC_JMP_SLOT +00000000 +__tls_get_addr \+ 0

ld/testsuite/ld-powerpc/tls32ldgd.s

@@ -0,0 +1,16 @@
+#PR 30697
+	.section ".tbss","awT",@nobits
+	.global _start,x
+	.hidden x
+	.align 2
+x:	.space 4
+
+	.text
+_start:
+ addi 3,30,x@got@tlsgd
+ bl __tls_get_addr(x@tlsgd)@plt
+
+ addi 3,30,x@got@tlsld
+ bl __tls_get_addr(x@tlsld)@plt
+ addis 3,3,x@dtprel@ha
+ addi 3,3,x@dtprel@l