Add -z noreloc-overflow option to x86-64 ld

Add -z noreloc-overflow command-line option to the x86-64 ELF linker to
disable relocation overflow check.  This can be used to avoid relocation
overflow check if there will be no dynamic relocation overflow at
run-time.

bfd/

	PR ld/19807
	* elf64-x86-64.c (elf_x86_64_relocate_section): Check
	no_reloc_overflow_check to diable R_X86_64_32/R_X86_64_32S
	relocation overflow check.

include/

	PR ld/19807
	* bfdlink.h (bfd_link_info): Add no_reloc_overflow_check.

ld/

	PR ld/19807
	* Makefile.am (ELF_X86_DEPS): Add
	$(srcdir)/emulparams/reloc_overflow.sh.
	* Makefile.in: Regenerated.
	* NEWS: Mention -z noreloc-overflow.
	* ld.texinfo: Document -z noreloc-overflow.
	* emulparams/elf32_x86_64.sh: Source
	${srcdir}/emulparams/reloc_overflow.sh.
	* emulparams/elf_x86_64.sh: Likewise.
	* emulparams/reloc_overflow.sh: New file.
	* testsuite/ld-x86-64/pr19807-1.s: New file.
	* testsuite/ld-x86-64/pr19807-1a.d: Likewise.
	* testsuite/ld-x86-64/pr19807-1b.d: Likewise.
	* testsuite/ld-x86-64/pr19807-2.s: Likewise.
	* testsuite/ld-x86-64/pr19807-2a.d: Likewise.
	* testsuite/ld-x86-64/pr19807-2b.d: Likewise.
	* testsuite/ld-x86-64/pr19807-2c.d: Likewise.
	* testsuite/ld-x86-64/pr19807-2d.d: Likewise.
	* testsuite/ld-x86-64/pr19807-2e.d: Likewise.
	* testsuite/ld-x86-64/x86-64.exp: Run PR ld/19807 tests.

18 files changed, 141 insertions, 0 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 1dfe830..d3172dc 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,26 @@
+2016-03-15  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/19807
+	* Makefile.am (ELF_X86_DEPS): Add
+	$(srcdir)/emulparams/reloc_overflow.sh.
+	* Makefile.in: Regenerated.
+	* NEWS: Mention -z noreloc-overflow.
+	* ld.texinfo: Document -z noreloc-overflow.
+	* emulparams/elf32_x86_64.sh: Source
+	${srcdir}/emulparams/reloc_overflow.sh.
+	* emulparams/elf_x86_64.sh: Likewise.
+	* emulparams/reloc_overflow.sh: New file.
+	* testsuite/ld-x86-64/pr19807-1.s: New file.
+	* testsuite/ld-x86-64/pr19807-1a.d: Likewise.
+	* testsuite/ld-x86-64/pr19807-1b.d: Likewise.
+	* testsuite/ld-x86-64/pr19807-2.s: Likewise.
+	* testsuite/ld-x86-64/pr19807-2a.d: Likewise.
+	* testsuite/ld-x86-64/pr19807-2b.d: Likewise.
+	* testsuite/ld-x86-64/pr19807-2c.d: Likewise.
+	* testsuite/ld-x86-64/pr19807-2d.d: Likewise.
+	* testsuite/ld-x86-64/pr19807-2e.d: Likewise.
+	* testsuite/ld-x86-64/x86-64.exp: Run PR ld/19807 tests.
+
 2016-03-13  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/19539
diff --git a/ld/Makefile.am b/ld/Makefile.am
index 4a8c0b6..d14e769 100644
--- a/ld/Makefile.am
+++ b/ld/Makefile.am
@@ -672,6 +672,7 @@ ELF_GEN_DEPS = $(srcdir)/emultempl/generic.em $(srcdir)/emultempl/elf-generic.em
 ELF_X86_DEPS = $(ELF_DEPS) $(srcdir)/emulparams/plt_unwind.sh \
 	       $(srcdir)/emulparams/extern_protected_data.sh \
 	       $(srcdir)/emulparams/dynamic_undefined_weak.sh \
+	       $(srcdir)/emulparams/reloc_overflow.sh \
 	       $(srcdir)/emulparams/call_nop.sh
 
 @TDIRS@
diff --git a/ld/Makefile.in b/ld/Makefile.in
index 45388d7..8c69228 100644
--- a/ld/Makefile.in
+++ b/ld/Makefile.in
@@ -888,6 +888,7 @@ ELF_GEN_DEPS = $(srcdir)/emultempl/generic.em $(srcdir)/emultempl/elf-generic.em
 ELF_X86_DEPS = $(ELF_DEPS) $(srcdir)/emulparams/plt_unwind.sh \
 	       $(srcdir)/emulparams/extern_protected_data.sh \
 	       $(srcdir)/emulparams/dynamic_undefined_weak.sh \
+	       $(srcdir)/emulparams/reloc_overflow.sh \
 	       $(srcdir)/emulparams/call_nop.sh
 
 
diff --git a/ld/NEWS b/ld/NEWS
index 4bf8091..b88da5c 100644
--- a/ld/NEWS
+++ b/ld/NEWS
@@ -1,5 +1,8 @@
 -*- text -*-
 
+* Support for -z noreloc-overflow in the x86-64 ELF linker to disable
+  relocation overflow check.
+
 * Add -z common/-z nocommon options for ELF targets to control whether to
   convert common symbols to the STT_COMMON type during a relocatable link.
 
diff --git a/ld/emulparams/elf32_x86_64.sh b/ld/emulparams/elf32_x86_64.sh
index 1b285c5..967c1b4 100644
--- a/ld/emulparams/elf32_x86_64.sh
+++ b/ld/emulparams/elf32_x86_64.sh
@@ -1,6 +1,7 @@
 . ${srcdir}/emulparams/plt_unwind.sh
 . ${srcdir}/emulparams/extern_protected_data.sh
 . ${srcdir}/emulparams/dynamic_undefined_weak.sh
+. ${srcdir}/emulparams/reloc_overflow.sh
 . ${srcdir}/emulparams/call_nop.sh
 SCRIPT_NAME=elf
 ELFSIZE=32
diff --git a/ld/emulparams/elf_x86_64.sh b/ld/emulparams/elf_x86_64.sh
index 0159a6c..e935f90 100644
--- a/ld/emulparams/elf_x86_64.sh
+++ b/ld/emulparams/elf_x86_64.sh
@@ -1,6 +1,7 @@
 . ${srcdir}/emulparams/plt_unwind.sh
 . ${srcdir}/emulparams/extern_protected_data.sh
 . ${srcdir}/emulparams/dynamic_undefined_weak.sh
+. ${srcdir}/emulparams/reloc_overflow.sh
 . ${srcdir}/emulparams/call_nop.sh
 SCRIPT_NAME=elf
 ELFSIZE=64
diff --git a/ld/emulparams/reloc_overflow.sh b/ld/emulparams/reloc_overflow.sh
new file mode 100644
index 0000000..7ba0ee5
--- /dev/null
+++ b/ld/emulparams/reloc_overflow.sh
@@ -0,0 +1,11 @@
+PARSE_AND_LIST_OPTIONS_RELOC_OVERFLOW='
+  fprintf (file, _("\
+  -z noreloc-overflow         Disable relocation overflow check\n"));
+'
+PARSE_AND_LIST_ARGS_CASE_Z_RELOC_OVERFLOW='
+      else if (strcmp (optarg, "noreloc-overflow") == 0)
+	link_info.no_reloc_overflow_check = TRUE;
+'
+
+PARSE_AND_LIST_OPTIONS="$PARSE_AND_LIST_OPTIONS $PARSE_AND_LIST_OPTIONS_RELOC_OVERFLOW"
+PARSE_AND_LIST_ARGS_CASE_Z="$PARSE_AND_LIST_ARGS_CASE_Z $PARSE_AND_LIST_ARGS_CASE_Z_RELOC_OVERFLOW"
diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index b2b99ab..d3d8dc6 100644
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -1213,6 +1213,11 @@ This option overrides linker backend default.  It can be used to avoid
 dynamic relocations against undefined weak symbols in executable.
 Supported for i386 and x86-64.
 
+@item noreloc-overflow
+Disable relocation overflow check.  This can be used to disable
+relocation overflow check if there will be no dynamic relocation
+overflow at run-time.  Supported for x86_64.
+
 @item call-nop=prefix-addr
 @itemx call-nop=prefix-nop
 @itemx call-nop=suffix-nop
diff --git a/ld/testsuite/ld-x86-64/pr19807-1.s b/ld/testsuite/ld-x86-64/pr19807-1.s
new file mode 100644
index 0000000..0870f6a
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19807-1.s
@@ -0,0 +1,8 @@
+	.globl  _start
+	.type	_start, @function
+_start:
+	movq	$foo, %rax
+	.size	_start, .-_start
+	.data
+foo:
+	.quad	0
diff --git a/ld/testsuite/ld-x86-64/pr19807-1a.d b/ld/testsuite/ld-x86-64/pr19807-1a.d
new file mode 100644
index 0000000..f3c5390
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19807-1a.d
@@ -0,0 +1,13 @@
+#source: pr19807-1.s
+#as: --64
+#ld: -pie -melf_x86_64 -z noreloc-overflow
+#objdump: -dw
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+[a-f0-9]+ <_start>:
+[ 	]*[a-f0-9]+:	48 c7 c0 ([0-9a-f]{2} ){4}	mov    \$0x[a-f0-9]+,%rax
+#pass
diff --git a/ld/testsuite/ld-x86-64/pr19807-1b.d b/ld/testsuite/ld-x86-64/pr19807-1b.d
new file mode 100644
index 0000000..6af4985
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19807-1b.d
@@ -0,0 +1,13 @@
+#source: pr19807-1.s
+#as: --x32
+#ld: -pie -melf32_x86_64 -z noreloc-overflow
+#objdump: -dw
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+[a-f0-9]+ <_start>:
+[ 	]*[a-f0-9]+:	48 c7 c0 ([0-9a-f]{2} ){4}	mov    \$0x[a-f0-9]+,%rax
+#pass
diff --git a/ld/testsuite/ld-x86-64/pr19807-2.s b/ld/testsuite/ld-x86-64/pr19807-2.s
new file mode 100644
index 0000000..2b309f2
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19807-2.s
@@ -0,0 +1,8 @@
+	.globl  _start
+	.type	_start, @function
+_start:
+	movl	$foo, %eax
+	.size	_start, .-_start
+	.data
+foo:
+	.quad	0
diff --git a/ld/testsuite/ld-x86-64/pr19807-2a.d b/ld/testsuite/ld-x86-64/pr19807-2a.d
new file mode 100644
index 0000000..1357d72
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19807-2a.d
@@ -0,0 +1,4 @@
+#source: pr19807-2.s
+#as: --64
+#ld: -pie -melf_x86_64
+#error: .*relocation R_X86_64_32 against `.data' can not be used when making a shared object; recompile with -fPIC
diff --git a/ld/testsuite/ld-x86-64/pr19807-2b.d b/ld/testsuite/ld-x86-64/pr19807-2b.d
new file mode 100644
index 0000000..a781b30
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19807-2b.d
@@ -0,0 +1,8 @@
+#source: pr19807-2.s
+#as: --x32
+#ld: -pie -melf32_x86_64
+#readelf: -r --wide
+
+Relocation section '.rela.dyn' at offset 0x[0-9a-f]+ contains 1 entries:
+ Offset     Info    Type                Sym. Value  Symbol's Name \+ Addend
+[0-9a-f]+ +[0-9a-f]+ +R_X86_64_RELATIVE +[0-9a-f]+
diff --git a/ld/testsuite/ld-x86-64/pr19807-2c.d b/ld/testsuite/ld-x86-64/pr19807-2c.d
new file mode 100644
index 0000000..83ac641
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19807-2c.d
@@ -0,0 +1,13 @@
+#source: pr19807-2.s
+#as: --x32
+#ld: -pie -melf32_x86_64
+#objdump: -dw
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+[a-f0-9]+ <_start>:
+[ 	]*[a-f0-9]+:	b8 ([0-9a-f]{2} ){4}      	mov    \$0x[a-f0-9]+,%eax
+#pass
diff --git a/ld/testsuite/ld-x86-64/pr19807-2d.d b/ld/testsuite/ld-x86-64/pr19807-2d.d
new file mode 100644
index 0000000..1171283
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19807-2d.d
@@ -0,0 +1,8 @@
+#source: pr19807-2.s
+#as: --64
+#ld: -pie -melf_x86_64 -z noreloc-overflow
+#readelf: -r --wide
+
+Relocation section '.rela.dyn' at offset 0x[0-9a-f]+ contains 1 entries:
+    Offset             Info             Type               Symbol's Value  Symbol's Name \+ Addend
+[0-9a-f]+ +[0-9a-f]+ +R_X86_64_RELATIVE +[0-9a-f]+
diff --git a/ld/testsuite/ld-x86-64/pr19807-2e.d b/ld/testsuite/ld-x86-64/pr19807-2e.d
new file mode 100644
index 0000000..f26616a
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19807-2e.d
@@ -0,0 +1,13 @@
+#source: pr19807-2.s
+#as: --64
+#ld: -pie -melf_x86_64 -z noreloc-overflow
+#objdump: -dw
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+[a-f0-9]+ <_start>:
+[ 	]*[a-f0-9]+:	b8 ([0-9a-f]{2} ){4}      	mov    \$0x[a-f0-9]+,%eax
+#pass
diff --git a/ld/testsuite/ld-x86-64/x86-64.exp b/ld/testsuite/ld-x86-64/x86-64.exp
index 49f9fa3..8f29761 100644
--- a/ld/testsuite/ld-x86-64/x86-64.exp
+++ b/ld/testsuite/ld-x86-64/x86-64.exp
@@ -247,6 +247,13 @@ run_dump_test "largecomm-1e"
 run_dump_test "largecomm-1f"
 run_dump_test "pr19539a"
 run_dump_test "pr19539b"
+run_dump_test "pr19807-1a"
+run_dump_test "pr19807-1b"
+run_dump_test "pr19807-2a"
+run_dump_test "pr19807-2b"
+run_dump_test "pr19807-2c"
+run_dump_test "pr19807-2d"
+run_dump_test "pr19807-2e"
 
 if { ![istarget "x86_64-*-linux*"] && ![istarget "x86_64-*-nacl*"]} {
     return