arc/nps400 : New cmem instructions and associated relocation

Add support for arc/nps400 cmem instructions, these load and store
instructions are hard-wired to access "0x57f00000 + 16-bit-offset".

Supporting this relocation required some additions to the arc relocation
handling in the bfd library, as well as the standard changes required to
add a new relocation type.

There's a test of the new instructions in the assembler, and a test of
the relocation in the linker.

bfd/ChangeLog:

	* reloc.c: Add BFD_RELOC_ARC_NPS_CMEM16 entry.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.
	* elf32-arc.c: Add 'opcode/arc.h' include.
	(struct arc_relocation_data): Add symbol_name.
	(arc_special_overflow_checks): New function.
	(arc_do_relocation): Use arc_special_overflow_checks, reindent as
	required, add an extra comment.
	(elf_arc_relocate_section): Setup symbol_name in reloc_data.

gas/ChangeLog:

	* testsuite/gas/arc/nps400-3.d: New file.
	* testsuite/gas/arc/nps400-3.s: New file.

include/ChangeLog:

	* elf/arc-reloc.def: Add ARC_NPS_CMEM16 reloc.
	* opcode/arc.h (NPS_CMEM_HIGH_VALUE): Define.

ld/ChangeLog:

	* testsuite/ld-arc/arc.exp: New file.
	* testsuite/ld-arc/nps-1.s: New file.
	* testsuite/ld-arc/nps-1a.d: New file.
	* testsuite/ld-arc/nps-1b.d: New file.
	* testsuite/ld-arc/nps-1b.err: New file.

opcodes/ChangeLog:

	* arc-nps400-tbl.h: Add xldb, xldw, xld, xstb, xstw, and xst
	instructions.
	* arc-opc.c (insert_nps_cmem_uimm16): New function.
	(extract_nps_cmem_uimm16): New function.
	(arc_operands): Add NPS_XLDST_UIMM16 operand.

3 files changed, 84 insertions, 0 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index c9ea846..f95cd7a 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,10 @@
 2016-04-14  Andrew Burgess  <andrew.burgess@embecosm.com>
 
+	* testsuite/gas/arc/nps400-3.d: New file.
+	* testsuite/gas/arc/nps400-3.s: New file.
+
+2016-04-14  Andrew Burgess  <andrew.burgess@embecosm.com>
+
 	* testsuite/gas/arc/add_s-err.s: Update target pattern.
 	* testsuite/gas/arc/warn.s: Likewise.
 	* testsuite/gas/elf/elf.exp: Run test for arc.
diff --git a/gas/testsuite/gas/arc/nps400-3.d b/gas/testsuite/gas/arc/nps400-3.d
new file mode 100644
index 0000000..ea52554
--- /dev/null
+++ b/gas/testsuite/gas/arc/nps400-3.d
@@ -0,0 +1,56 @@
+#as: -mcpu=nps400
+#objdump: -dr
+
+.*: +file format .*arc.*
+
+Disassembly of section .text:
+
+[0-9a-f]+ <.*>:
+   0:	5988 0000           	xldb	r12,\[0x57f00000\]
+   4:	5ae8 ffff           	xldb	r23,\[0x57f0ffff\]
+   8:	5868 0000           	xldb	r3,\[0x57f00000\]
+   c:	5968 ffff           	xldb	r11,\[0x57f0ffff\]
+  10:	5a88 0000           	xldb	r20,\[0x57f00000\]
+			10: R_ARC_NPS_CMEM16	foo
+  14:	5828 0000           	xldb	r1,\[0x57f00000\]
+			14: R_ARC_NPS_CMEM16	foo\+0x20
+  18:	5989 0000           	xldw	r12,\[0x57f00000\]
+  1c:	5ae9 ffff           	xldw	r23,\[0x57f0ffff\]
+  20:	5869 0000           	xldw	r3,\[0x57f00000\]
+  24:	5969 ffff           	xldw	r11,\[0x57f0ffff\]
+  28:	5a89 0000           	xldw	r20,\[0x57f00000\]
+			28: R_ARC_NPS_CMEM16	foo
+  2c:	5829 0000           	xldw	r1,\[0x57f00000\]
+			2c: R_ARC_NPS_CMEM16	foo\+0x20
+  30:	598a 0000           	xld	r12,\[0x57f00000\]
+  34:	5aea ffff           	xld	r23,\[0x57f0ffff\]
+  38:	586a 0000           	xld	r3,\[0x57f00000\]
+  3c:	596a ffff           	xld	r11,\[0x57f0ffff\]
+  40:	5a8a 0000           	xld	r20,\[0x57f00000\]
+			40: R_ARC_NPS_CMEM16	foo
+  44:	582a 0000           	xld	r1,\[0x57f00000\]
+			44: R_ARC_NPS_CMEM16	foo\+0x20
+  48:	598c 0000           	xstb	r12,\[0x57f00000\]
+  4c:	5aec ffff           	xstb	r23,\[0x57f0ffff\]
+  50:	586c 0000           	xstb	r3,\[0x57f00000\]
+  54:	596c ffff           	xstb	r11,\[0x57f0ffff\]
+  58:	5a8c 0000           	xstb	r20,\[0x57f00000\]
+			58: R_ARC_NPS_CMEM16	foo
+  5c:	582c 0000           	xstb	r1,\[0x57f00000\]
+			5c: R_ARC_NPS_CMEM16	foo\+0x20
+  60:	598d 0000           	xstw	r12,\[0x57f00000\]
+  64:	5aed ffff           	xstw	r23,\[0x57f0ffff\]
+  68:	586d 0000           	xstw	r3,\[0x57f00000\]
+  6c:	596d ffff           	xstw	r11,\[0x57f0ffff\]
+  70:	5a8d 0000           	xstw	r20,\[0x57f00000\]
+			70: R_ARC_NPS_CMEM16	foo
+  74:	582d 0000           	xstw	r1,\[0x57f00000\]
+			74: R_ARC_NPS_CMEM16	foo\+0x20
+  78:	598e 0000           	xst	r12,\[0x57f00000\]
+  7c:	5aee ffff           	xst	r23,\[0x57f0ffff\]
+  80:	586e 0000           	xst	r3,\[0x57f00000\]
+  84:	596e ffff           	xst	r11,\[0x57f0ffff\]
+  88:	5a8e 0000           	xst	r20,\[0x57f00000\]
+			88: R_ARC_NPS_CMEM16	foo
+  8c:	582e 0000           	xst	r1,\[0x57f00000\]
+			8c: R_ARC_NPS_CMEM16	foo\+0x20
diff --git a/gas/testsuite/gas/arc/nps400-3.s b/gas/testsuite/gas/arc/nps400-3.s
new file mode 100644
index 0000000..6840223
--- /dev/null
+++ b/gas/testsuite/gas/arc/nps400-3.s
@@ -0,0 +1,23 @@
+        .macro  xldst_test mnem
+        \mnem r12, [ 0x0 ]
+        \mnem r23, [ 0xffff ]
+        \mnem r3, [ 0x57f00000 ]
+        \mnem r11, [ 0x57f0ffff ]
+        \mnem r20, [ foo ]
+        \mnem r1, [ foo + 0x20 ]
+        .endm
+
+        .text
+        ;; xldb
+        xldst_test xldb
+        ;; xldw
+        xldst_test xldw
+        ;; xld
+        xldst_test xld
+        ;; xstb
+        xldst_test xstb
+        ;; xstw
+        xldst_test xstw
+        ;; xst
+        xldst_test xst
+