Fix for PR ld/16044: elf32-cris.c h->plt.refcount inconsistency

bfd/ChangeLog

@@ -1,3 +1,12 @@
+2017-03-28  Hans-Peter Nilsson  <hp@axis.com>
+
+	PR ld/16044
+	* elf32-cris.c (elf_cris_adjust_gotplt_to_got): Adjust BFD_ASSERT
+	to handle a local symbol with a hash-symbol-entry; without PLT.
+	Add BFD_ASSERT for an incidental case with GOT entry present.
+	(cris_elf_check_relocs): Increment PLT refcount only if the symbol
+	isn't forced-or-set local.
+
 2017-03-27  Pip Cet  <pipcet@gmail.com>
 
 	* wasm-module.c: New file to support WebAssembly modules.

bfd/elf32-cris.c

@@ -2714,8 +2714,9 @@ elf_cris_adjust_gotplt_to_got (struct elf_cris_link_hash_entry *h, void * p)
   struct bfd_link_info *info = (struct bfd_link_info *) p;
 
   /* A GOTPLT reloc, when activated, is supposed to be included into
-     the PLT refcount.  */
+     the PLT refcount, when the symbol isn't set-or-forced local.  */
   BFD_ASSERT (h->gotplt_refcount == 0
+	      || h->root.plt.refcount == -1
 	      || h->gotplt_refcount <= h->root.plt.refcount);
 
   /* If nobody wanted a GOTPLT with this symbol, we're done.  */
@@ -2741,6 +2742,7 @@ elf_cris_adjust_gotplt_to_got (struct elf_cris_link_hash_entry *h, void * p)
       srelgot = elf_hash_table (info)->srelgot;
 
       /* Put accurate refcounts there.  */
+      BFD_ASSERT (h->root.got.refcount >= 0);
       h->root.got.refcount += h->gotplt_refcount;
       h->reg_got_refcount = h->gotplt_refcount;
 
@@ -3476,7 +3478,10 @@ cris_elf_check_relocs (bfd *abfd,
 	    continue;
 
 	  h->needs_plt = 1;
-	  h->plt.refcount++;
+
+	  /* If the symbol is forced local, the refcount is unavailable.  */
+	  if (h->plt.refcount != -1)
+	    h->plt.refcount++;
 	  break;
 
 	case R_CRIS_8:

ld/ChangeLog

@@ -1,3 +1,9 @@
+2017-03-28  Hans-Peter Nilsson  <hp@axis.com>
+
+	PR ld/16044
+	* testsuite/ld-cris/pr16044.d, testsuite/ld-cris/dso-1c.s,
+	testsuite/ld-cris/dso-2b.s, testsuite/ld-cris/dso-4.s: New test.
+
 2017-03-21  Sandra Loosemore  <sandra@codesourcery.com>
 
 	* testsuite/lib/ld-lib.exp (check_shared_lib_support): Return

ld/testsuite/ld-cris/dso-1c.s

@@ -0,0 +1,2 @@
+	.include "dso-1.s"
+	.hidden dsofn

ld/testsuite/ld-cris/dso-2b.s

@@ -0,0 +1,2 @@
+	.include "dso-2.s"
+	.hidden dsofn

ld/testsuite/ld-cris/dso-4.s

@@ -0,0 +1,6 @@
+	.text
+	.global	export_2
+	.type	export_2,@function
+export_2:
+	.hidden dsofn
+	move.d dsofn:GOTOFF,$r4

ld/testsuite/ld-cris/pr16044.d

@@ -0,0 +1,43 @@
+#source: dso-4.s
+#source: dso-2b.s
+#source: dso-1c.s
+#as: --pic --no-underscore --em=criself -I$srcdir/$subdir
+#ld: --shared -m crislinux
+#readelf: -s -r
+
+# PR 16044 is about a (compile-time-non-local) hidden function symbol,
+# entered as an undef reference with a R_CRIS_32_PLT_GOTREL relocation
+# referring to a hidden symbol, later defined.  Here, we invalidly
+# incremented the h->plt.refcount (from -1) as part of that relocation
+# processing.  There are some PLTGOT relocations.  As there are no
+# circumstances requiring a PLT entry for this symbol, its PLT entry
+# can be eliminated and the PLTGOT relocations can be made to a static
+# element in the GOT, relocated with the absolute-to-relative
+# R_CRIS_RELATIVE relocation without symbol lookup.  As part of
+# eliminating unneeded PLT entries (and PLTGOT to "static" GOT
+# elimination), a later pass noticed the inconsistency through an
+# assert.
+#
+# The key points in this dump that may need future adjustments are the
+# single dynamic relocation, that the dsofn symbol it points to, is
+# local, its absence from the dynamic symbol table and that the
+# relocation and symbol values match.
+
+Relocation section '\.rela\.dyn' at offset 0x[0-9a-f]+ contains 1 entries:
+ Offset[ 	]+Info[ 	]+Type[ 	]+Sym\.Value  Sym\. Name \+ Addend
+[0-9a-f]+  0+[0-9a-f]+ R_CRIS_RELATIVE[ 	]+184
+
+Symbol table '\.dynsym' contains 7 entries:
+ +Num: +Value +Size +Type +Bind +Vis +Ndx +Name
+ +0: 0+ +0 +NOTYPE +LOCAL +DEFAULT +UND 
+ +1: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +5 
+ +2: [0-9a-f]+ +0 +FUNC +GLOBAL +DEFAULT +5 export_1
+ +3: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +7 __bss_start
+ +4: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +7 _edata
+ +5: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +7 _end
+ +6: [0-9a-f]+ +0 +FUNC +GLOBAL +DEFAULT +5 export_2
+
+Symbol table '\.symtab' contains [0-9]+ entries:
+#...
+ +[0-9]+: 0+184  +2 FUNC + LOCAL + DEFAULT + 5 dsofn
+#...