Add -z bndplt to generate BND prefix in PLT entries

This patch adds "-z bndplt" option Linux/x86-64 linker to generate BND
prefix in PLT entries.  It also updated Linux/x86-64 assembler not to
generate R_X86_64_PLT32_BND nor R_X86_64_PC32_BND relocations.

bfd/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* elf64-x86-64.c (elf_x86_64_check_relocs): Enable MPX PLT only
	for -z bndplt.

gas/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* config/tc-i386-intel.c (i386_operator): Remove last argument
	from lex_got call.
	* config/tc-i386.c (reloc): Remove bnd_prefix from parameters'
	list.  Return always BFD_RELOC_32_PCREL.
	* (output_branch): Remove condition for BFD_RELOC_X86_64_PC32_BND.
	* (output_jump): Update call to reloc accordingly.
	* (output_interseg_jump): Likewise.
	* (output_disp): Likewise.
	* (output_imm): Likewise.
	* (x86_cons_fix_new): Likewise.
	* (lex_got): Remove bnd_prefix from parameters' list in macro and
	declarations. Don't use BFD_RELOC_X86_64_PLT32_BND.
	* (x86_cons): Update call to lex_got accordingly.
	* (i386_immediate): Likewise.
	* (i386_displacement): Likewise.
	* (md_apply_fix): Don't use BFD_RELOC_X86_64_PLT32_BND nor
	BFD_RELOC_X86_64_PC32_BND.
	* (tc_gen_reloc): Likewise.

include/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* bfdlink.h (struct bfd_link_info): Add bndplt.

ld/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* emulparams/elf_x86_64.sh (BNDPLT): Set to yes for x86_64.
	* emultempl/elf32.em (gld${EMULATION_NAME}_handle_option): Handle
	"-z bndplt" if BNDPLT is yes.
	(gld${EMULATION_NAME}_list_options): Add "-z bndplt" entry.
	* ld.texinfo: Add description for bndplt.

ld/testsuite/

2014-11-18  Igor Zamyatin  <igor.zamyatin@intel.com>

	* testsuite/ld-x86-64/bnd-ifunc-1.d: Add bndplt option.
	* testsuite/ld-x86-64/bnd-ifunc-2.d: Likewise.
	* testsuite/ld-x86-64/bnd-plt-1.d: Likewise.  Update dissassembly
	sections.
	* testsuite/ld-x86-64/mpx.exp: Handle mpx3 and mpx4 tests.
	* testsuite/ld-x86-64/mpx1a.rd: Remove _BND from relocation name.
	* testsuite/ld-x86-64/mpx1c.rd: Likewise.
	* testsuite/ld-x86-64/mpx2a.rd: Likewise.
	* testsuite/ld-x86-64/mpx2c.rd: Likewise.
	* testsuite/ld-x86-64/mpx3.dd: New file.
	* testsuite/ld-x86-64/mpx3a.s: Likewise.
	* testsuite/ld-x86-64/mpx3b.s: Likewise.
	* testsuite/ld-x86-64/mpx4.dd: Likewise.
	* testsuite/ld-x86-64/mpx4a.s: Likewise.
	* testsuite/ld-x86-64/mpx4b.s: Likewise.

1 files changed, 35 insertions, 0 deletions

diff --git a/ld/testsuite/ld-x86-64/mpx3.dd b/ld/testsuite/ld-x86-64/mpx3.dd
new file mode 100644
index 0000000..2a8356d
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/mpx3.dd
@@ -0,0 +1,35 @@
+.*: +file format .*
+
+
+Disassembly of section .plt:
+
+0+400290 <.plt>:
+[  	]*[a-f0-9]+:	ff 35 6a 01 20 00    	pushq  0x20016a\(%rip\)        # 600400 <_GLOBAL_OFFSET_TABLE_\+0x8>
+[  	]*[a-f0-9]+:	f2 ff 25 6b 01 20 00 	bnd jmpq \*0x20016b\(%rip\)        # 600408 <_GLOBAL_OFFSET_TABLE_\+0x10>
+[  	]*[a-f0-9]+:	0f 1f 00             	nopl   \(%rax\)
+[  	]*[a-f0-9]+:	68 00 00 00 00       	pushq  \$0x0
+[  	]*[a-f0-9]+:	f2 e9 e5 ff ff ff    	bnd jmpq 400290 <call1@plt-0x30>
+[  	]*[a-f0-9]+:	0f 1f 44 00 00       	nopl   0x0\(%rax,%rax,1\)
+[  	]*[a-f0-9]+:	68 01 00 00 00       	pushq  \$0x1
+[  	]*[a-f0-9]+:	f2 e9 d5 ff ff ff    	bnd jmpq 400290 <call1@plt-0x30>
+[  	]*[a-f0-9]+:	0f 1f 44 00 00       	nopl   0x0\(%rax,%rax,1\)
+
+Disassembly of section .plt.bnd:
+
+0+4002c0 <call1@plt>:
+[  	]*[a-f0-9]+:	f2 ff 25 49 01 20 00 	bnd jmpq \*0x200149\(%rip\)        # 600410 <_GLOBAL_OFFSET_TABLE_\+0x18>
+[  	]*[a-f0-9]+:	90                   	nop
+
+0+4002c8 <call2@plt>:
+[  	]*[a-f0-9]+:	f2 ff 25 49 01 20 00 	bnd jmpq \*0x200149\(%rip\)        # 600418 <_GLOBAL_OFFSET_TABLE_\+0x20>
+[  	]*[a-f0-9]+:	90                   	nop
+
+Disassembly of section .text:
+
+0+4002d0 <_start>:
+[  	]*[a-f0-9]+:	bf c0 02 40 00       	mov    \$0x4002c0,%edi
+[  	]*[a-f0-9]+:	f2 ff d7             	bnd callq \*%rdi
+[  	]*[a-f0-9]+:	48 8b 3d 41 01 20 00 	mov    0x200141\(%rip\),%rdi        # 600420 <func>
+[  	]*[a-f0-9]+:	f2 ff d7             	bnd callq \*%rdi
+[  	]*[a-f0-9]+:	c3                   	retq   
+#pass