Add "-z call-nop=PADDING" option to ld

The ld linker can transform indirect call to a locally defined function,
foo, via its GOT slot, to either "NOP call foo" or "call foo NOP" where
NOP is a 1-byte NOP padding.  This patch adds a "-z call-nop=PADDING"
option to x86 ld to control 1-byte NOP padding for x86 call instruction.
PADDING is one of prefix-addr, prefix-nop, suffix-nop, prefix-NUMBER or
suffix-NUMBER.

bfd/

	* elf32-i386.c (elf_i386_convert_load): Use call_nop_byte and
	check call_nop_as_suffix for 1-byte NOP padding to pad call.
	* elf64-x86-64.c (elf_x86_64_convert_load): Likewise.

include/

	* bfdlink.h (bfd_link_info): Add call_nop_as_suffix and
	call_nop_byte.

ld/

	* ld/ld.texinfo: Document "-z call-nop=PADDING" option.
	* emulparams/call_nop.sh: New file.
	* emulparams/elf_i386_be.sh: Source
	${srcdir}/emulparams/call_nop.sh.
	* emulparams/elf_i386_chaos.sh: Likewise.
	* emulparams/elf_i386_ldso.sh: Likewise.
	* emulparams/elf_i386_vxworks.sh: Likewise.
	* emulparams/elf_iamcu.sh: Likewise.
	* emulparams/elf_k1om.sh: Likewise.
	* emulparams/elf_l1om.sh: Likewise.
	* emulparams/elf_x86_64.sh: Likewise.
	* emultempl/elf32.em (gld${EMULATION_NAME}_before_parse): Set
	link_info.call_nop_byte if $CALL_NOP_BYTE isn't empty.

ld/testsuite/

	* ld-i386/call3.s: New file.
	* ld-i386/call3a.d: Likewise.
	* ld-i386/call3b.d: Likewise.
	* ld-i386/call3c.d: Likewise.
	* ld-i386/call3d.d: Likewise.
	* ld-i386/call3e.d: Likewise.
	* ld-i386/call3f.d: Likewise.
	* ld-i386/call3g.d: Likewise.
	* ld-i386/call3h.d: Likewise.
	* ld-i386/load1-nacl.d: Likewise.
	* ld-x86-64/call1.s: Likewise.
	* ld-x86-64/call1a.d: Likewise.
	* ld-x86-64/call1b.d: Likewise.
	* ld-x86-64/call1c.d: Likewise.
	* ld-x86-64/call1d.d: Likewise.
	* ld-x86-64/call1e.d: Likewise.
	* ld-x86-64/call1f.d: Likewise.
	* ld-x86-64/call1g.d: Likewise.
	* ld-x86-64/call1h.d: Likewise.
	* ld-x86-64/call1i.d: Likewise.
	* ld-x86-64/load1a-nacl.d: Likewise.
	* ld-x86-64/load1b-nacl.d: Likewise.
	* ld-x86-64/load1c-nacl.d: Likewise.
	* ld-x86-64/load1d-nacl.d: Likewise.

1 files changed, 59 insertions, 0 deletions

diff --git a/ld/testsuite/ld-i386/load1-nacl.d b/ld/testsuite/ld-i386/load1-nacl.d
new file mode 100644
index 0000000..1245639
--- /dev/null
+++ b/ld/testsuite/ld-i386/load1-nacl.d
@@ -0,0 +1,59 @@
+#source: load1.s
+#as: --32
+#ld: -melf_i386
+#objdump: -dw --sym
+#target: i?86-*-nacl* x86_64-*-nacl*
+
+.*: +file format .*
+
+SYMBOL TABLE:
+#...
+10030080 l     O .data	0+1 bar
+#...
+10030081 g     O .data	0+1 foo
+#...
+
+Disassembly of section .text:
+
+0+20000 <_start>:
+[ 	]*[a-f0-9]+:	8d 05 80 00 03 10    	lea    0x10030080,%eax
+[ 	]*[a-f0-9]+:	81 d0 80 00 03 10    	adc    \$0x10030080,%eax
+[ 	]*[a-f0-9]+:	81 c3 80 00 03 10    	add    \$0x10030080,%ebx
+[ 	]*[a-f0-9]+:	81 e1 80 00 03 10    	and    \$0x10030080,%ecx
+[ 	]*[a-f0-9]+:	81 fa 80 00 03 10    	cmp    \$0x10030080,%edx
+[ 	]*[a-f0-9]+:	81 cf 80 00 03 10    	or     \$0x10030080,%edi
+[ 	]*[a-f0-9]+:	81 de 80 00 03 10    	sbb    \$0x10030080,%esi
+[ 	]*[a-f0-9]+:	81 ed 80 00 03 10    	sub    \$0x10030080,%ebp
+[ 	]*[a-f0-9]+:	81 f4 80 00 03 10    	xor    \$0x10030080,%esp
+[ 	]*[a-f0-9]+:	f7 c1 80 00 03 10    	test   \$0x10030080,%ecx
+[ 	]*[a-f0-9]+:	8d 05 80 00 03 10    	lea    0x10030080,%eax
+[ 	]*[a-f0-9]+:	81 d0 80 00 03 10    	adc    \$0x10030080,%eax
+[ 	]*[a-f0-9]+:	81 c3 80 00 03 10    	add    \$0x10030080,%ebx
+[ 	]*[a-f0-9]+:	81 e1 80 00 03 10    	and    \$0x10030080,%ecx
+[ 	]*[a-f0-9]+:	81 fa 80 00 03 10    	cmp    \$0x10030080,%edx
+[ 	]*[a-f0-9]+:	81 cf 80 00 03 10    	or     \$0x10030080,%edi
+[ 	]*[a-f0-9]+:	81 de 80 00 03 10    	sbb    \$0x10030080,%esi
+[ 	]*[a-f0-9]+:	81 ed 80 00 03 10    	sub    \$0x10030080,%ebp
+[ 	]*[a-f0-9]+:	81 f4 80 00 03 10    	xor    \$0x10030080,%esp
+[ 	]*[a-f0-9]+:	f7 c1 80 00 03 10    	test   \$0x10030080,%ecx
+[ 	]*[a-f0-9]+:	8d 05 81 00 03 10    	lea    0x10030081,%eax
+[ 	]*[a-f0-9]+:	81 d0 81 00 03 10    	adc    \$0x10030081,%eax
+[ 	]*[a-f0-9]+:	81 c3 81 00 03 10    	add    \$0x10030081,%ebx
+[ 	]*[a-f0-9]+:	81 e1 81 00 03 10    	and    \$0x10030081,%ecx
+[ 	]*[a-f0-9]+:	81 fa 81 00 03 10    	cmp    \$0x10030081,%edx
+[ 	]*[a-f0-9]+:	81 cf 81 00 03 10    	or     \$0x10030081,%edi
+[ 	]*[a-f0-9]+:	81 de 81 00 03 10    	sbb    \$0x10030081,%esi
+[ 	]*[a-f0-9]+:	81 ed 81 00 03 10    	sub    \$0x10030081,%ebp
+[ 	]*[a-f0-9]+:	81 f4 81 00 03 10    	xor    \$0x10030081,%esp
+[ 	]*[a-f0-9]+:	f7 c1 81 00 03 10    	test   \$0x10030081,%ecx
+[ 	]*[a-f0-9]+:	8d 05 81 00 03 10    	lea    0x10030081,%eax
+[ 	]*[a-f0-9]+:	81 d0 81 00 03 10    	adc    \$0x10030081,%eax
+[ 	]*[a-f0-9]+:	81 c3 81 00 03 10    	add    \$0x10030081,%ebx
+[ 	]*[a-f0-9]+:	81 e1 81 00 03 10    	and    \$0x10030081,%ecx
+[ 	]*[a-f0-9]+:	81 fa 81 00 03 10    	cmp    \$0x10030081,%edx
+[ 	]*[a-f0-9]+:	81 cf 81 00 03 10    	or     \$0x10030081,%edi
+[ 	]*[a-f0-9]+:	81 de 81 00 03 10    	sbb    \$0x10030081,%esi
+[ 	]*[a-f0-9]+:	81 ed 81 00 03 10    	sub    \$0x10030081,%ebp
+[ 	]*[a-f0-9]+:	81 f4 81 00 03 10    	xor    \$0x10030081,%esp
+[ 	]*[a-f0-9]+:	f7 c1 81 00 03 10    	test   \$0x10030081,%ecx
+#pass