From 9d1d54d5a7e3b634895e6e434646c706eb55c082 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Sun, 11 Jan 2015 08:04:27 -0800
Subject: [PATCH] Only discard space for pc-relative relocs symbols

When building PIE, we should only discard space for pc-relative relocs
symbols which turn out to need copy relocs.

bfd/

	PR ld/17827
	* elf64-x86-64.c (elf_x86_64_allocate_dynrelocs): For PIE,
	only discard space for pc-relative relocs symbols which turn
	out to need copy relocs.

ld/testsuite/

	PR ld/17827
	* ld-x86-64/pr17689.out: Updated.
	* ld-x86-64/pr17689b.S: Likewise.

	* ld-x86-64/pr17827.rd: New file.

	* ld-x86-64/x86-64.exp: Run PR ld/17827 test.
---
 bfd/ChangeLog                      |  7 +++++++
 bfd/elf64-x86-64.c                 | 16 +++++++++++++---
 ld/testsuite/ChangeLog             | 10 ++++++++++
 ld/testsuite/ld-x86-64/pr17689.out |  1 +
 ld/testsuite/ld-x86-64/pr17689b.S  | 10 ++++++++++
 ld/testsuite/ld-x86-64/pr17827.rd  |  4 ++++
 ld/testsuite/ld-x86-64/x86-64.exp  |  8 ++++++++
 7 files changed, 53 insertions(+), 3 deletions(-)
 create mode 100644 ld/testsuite/ld-x86-64/pr17827.rd

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 70b138b2d0..234d559c1e 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,10 @@
+2015-01-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/17827
+	* elf64-x86-64.c (elf_x86_64_allocate_dynrelocs): For PIE,
+	only discard space for pc-relative relocs symbols which turn
+	out to need copy relocs.
+
 2015-01-09  Nick Clifton  <nickc@redhat.com>
 
 	* tekhex.c (getvalue): Fix thinko in test for correct extraction
diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c
index 581ee17177..6b7d3c9a56 100644
--- a/bfd/elf64-x86-64.c
+++ b/bfd/elf64-x86-64.c
@@ -2742,13 +2742,23 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
 		       && ! bfd_elf_link_record_dynamic_symbol (info, h))
 		return FALSE;
 	    }
-	  /* For PIE, discard space for relocs against symbols which
-	     turn out to need copy relocs.  */
+	  /* For PIE, discard space for pc-relative relocs against
+	     symbols which turn out to need copy relocs.  */
 	  else if (info->executable
 		   && (h->needs_copy || eh->needs_copy)
 		   && h->def_dynamic
 		   && !h->def_regular)
-	    eh->dyn_relocs = NULL;
+	    {
+	      struct elf_dyn_relocs **pp;
+
+	      for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
+		{
+		  if (p->pc_count != 0)
+		    *pp = p->next;
+		  else
+		    pp = &p->next;
+		}
+	    }
 	}
     }
   else if (ELIMINATE_COPY_RELOCS)
diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index 229e006fc6..e6903f7f21 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,13 @@
+2015-01-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/17827
+	* ld-x86-64/pr17689.out: Updated.
+	* ld-x86-64/pr17689b.S: Likewise.
+
+	* ld-x86-64/pr17827.rd: New file.
+
+	* ld-x86-64/x86-64.exp: Run PR ld/17827 test.
+
 2015-01-08  Jan Beulich  <jbeulich@suse.com>
 
 	* ld-x86-64/pr14207.d: Adjust expecations to cover the
diff --git a/ld/testsuite/ld-x86-64/pr17689.out b/ld/testsuite/ld-x86-64/pr17689.out
index 7ef22e9a43..38e0352515 100644
--- a/ld/testsuite/ld-x86-64/pr17689.out
+++ b/ld/testsuite/ld-x86-64/pr17689.out
@@ -1 +1,2 @@
 PASS
+PASS
diff --git a/ld/testsuite/ld-x86-64/pr17689b.S b/ld/testsuite/ld-x86-64/pr17689b.S
index c95f891057..64485c7e91 100644
--- a/ld/testsuite/ld-x86-64/pr17689b.S
+++ b/ld/testsuite/ld-x86-64/pr17689b.S
@@ -5,8 +5,18 @@ main:
 	subq	$8, %rsp
 	movq	bar_alias(%rip), %rdi
 	call	foo@PLT
+	movq	ptr(%rip), %rax
+	movq	(%rax), %rdi
+	call	foo@PLT
 	xorl	%eax, %eax
 	addq	$8, %rsp
 	ret
 	.size	main, .-main
+	.globl	ptr
+	.section	.data.rel,"aw",@progbits
+	.align 8
+	.type	ptr, @object
+	.size	ptr, 8
+ptr:
+	.quad	bar_alias
 	.section	.note.GNU-stack,"",@progbits
diff --git a/ld/testsuite/ld-x86-64/pr17827.rd b/ld/testsuite/ld-x86-64/pr17827.rd
new file mode 100644
index 0000000000..d78ea2f7cc
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr17827.rd
@@ -0,0 +1,4 @@
+#failif
+#...
+[0-9a-f ]+R_X86_64_NONE.*
+#...
diff --git a/ld/testsuite/ld-x86-64/x86-64.exp b/ld/testsuite/ld-x86-64/x86-64.exp
index aa8555ff3e..5b49bffe66 100644
--- a/ld/testsuite/ld-x86-64/x86-64.exp
+++ b/ld/testsuite/ld-x86-64/x86-64.exp
@@ -432,6 +432,14 @@ if { [isnative] && [which $CC] != 0 } {
 	    {{readelf {-Wr} pr17689.rd}} \
 	    "pr17689" \
 	] \
+	[list \
+	    "Build pr17827 with PIE without -fPIE" \
+	    "tmpdir/pr17689.so -pie" \
+	    "" \
+	    { pr17689b.S } \
+	    {{readelf {-Wr} pr17827.rd}} \
+	    "pr17827" \
+	] \
     ]
 
     run_ld_link_exec_tests [] [list \
-- 
2.34.1