[ARC] Enable .cfi_* pseudo-ops.

gas/
2016-02-16  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/tc-arc.c (tc_arc_frame_initial_instructions): New
	function.
	(tc_arc_regname_to_dw2regnum): Likewise.
	* config/tc-arc.h (TARGET_USE_CFIPOP): Define
	(tc_cfi_frame_initial_instructions): Likewise.
	(tc_regname_to_dw2regnum): Likewise.

gas/testsuite
2016-02-16  Claudiu Zissulescu  <claziss@synopsys.com>

	* gas/cfi/cfi-arc-1.d: New file.
	* gas/cfi/cfi-arc-1.s: Likewise.
	* gas/cfi/cfi.exp: Allow running tests for arc.

binutils/
2016-02-16  Claudiu Zissulescu  <claziss@synopsys.com>

	* readelf.c (is_32bit_pcrel_reloc): Add R_ARC_32_PCREL.

7 files changed, 98 insertions, 1 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index ce09b01..220b5b1 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,12 @@
+2016-02-16  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* config/tc-arc.c (tc_arc_frame_initial_instructions): New
+	function.
+	(tc_arc_regname_to_dw2regnum): Likewise.
+	* config/tc-arc.h (TARGET_USE_CFIPOP): Define
+	(tc_cfi_frame_initial_instructions): Likewise.
+	(tc_regname_to_dw2regnum): Likewise.
+
 2016-02-16  Trevor Saunders  <tbsaunde@tbsaunde.org>
 
 	* doc/internals.texi (S_IS_EXTERN): Remove.
diff --git a/gas/config/tc-arc.c b/gas/config/tc-arc.c
index f2d3a0e..bfe9ae1 100644
--- a/gas/config/tc-arc.c
+++ b/gas/config/tc-arc.c
@@ -24,6 +24,7 @@
 #include "subsegs.h"
 #include "struc-symbol.h"
 #include "dwarf2dbg.h"
+#include "dw2gencfi.h"
 #include "safe-ctype.h"
 
 #include "opcode/arc.h"
@@ -3675,3 +3676,24 @@ arc_pcrel_adjust (fragS *fragP)
 
   return 0;
 }
+
+/* Initialize the DWARF-2 unwind information for this procedure.  */
+
+void
+tc_arc_frame_initial_instructions (void)
+{
+  /* Stack pointer is register 28.  */
+  cfi_add_CFA_def_cfa_register (28);
+}
+
+int
+tc_arc_regname_to_dw2regnum (char *regname)
+{
+  struct symbol *sym;
+
+  sym = hash_find (arc_reg_hash, regname);
+  if (sym)
+    return S_GET_VALUE (sym);
+
+  return -1;
+}
diff --git a/gas/config/tc-arc.h b/gas/config/tc-arc.h
index acd007b..95efd77 100644
--- a/gas/config/tc-arc.h
+++ b/gas/config/tc-arc.h
@@ -191,12 +191,21 @@ extern void arc_handle_align (fragS *);
 extern void arc_cons_fix_new (fragS *, int, int, expressionS *,
 			      bfd_reloc_code_real_type);
 extern void arc_frob_label (symbolS *);
+extern void tc_arc_frame_initial_instructions (void);
+extern int tc_arc_regname_to_dw2regnum (char *regname);
 
 /* The blink register is r31.  */
 #define DWARF2_DEFAULT_RETURN_COLUMN	31
 /* Registers are generally saved at negative offsets to the CFA.  */
 #define DWARF2_CIE_DATA_ALIGNMENT	(-4)
 
+/* We want .cfi_* pseudo-ops for generating unwind info.  */
+#define TARGET_USE_CFIPOP 1
+
+/* CFI hooks.  */
+#define tc_cfi_frame_initial_instructions  tc_arc_frame_initial_instructions
+#define tc_regname_to_dw2regnum tc_arc_regname_to_dw2regnum
+
 /* Define the NOPs.  */
 #define NOP_OPCODE_S   0x000078E0
 #define NOP_OPCODE_L   0x264A7000 /* mov 0,0.  */
diff --git a/gas/testsuite/ChangeLog b/gas/testsuite/ChangeLog
new file mode 100644
index 0000000..e9652f8
--- /dev/null
+++ b/gas/testsuite/ChangeLog
@@ -0,0 +1,5 @@
+2016-02-16  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* gas/cfi/cfi-arc-1.d: New file.
+	* gas/cfi/cfi-arc-1.s: Likewise.
+	* gas/cfi/cfi.exp: Allow running tests for arc.
diff --git a/gas/testsuite/gas/cfi/cfi-arc-1.d b/gas/testsuite/gas/cfi/cfi-arc-1.d
new file mode 100644
index 0000000..cdb75bd
--- /dev/null
+++ b/gas/testsuite/gas/cfi/cfi-arc-1.d
@@ -0,0 +1,30 @@
+#readelf: -wf
+#name: CFI on ARC
+
+Contents of the .eh_frame section:
+
+00000000 00000010 00000000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 1
+  Data alignment factor: -4
+  Return address column: 31
+  Augmentation data:     1b
+
+  DW_CFA_def_cfa_register: r28
+  DW_CFA_nop
+
+00000014 00000020 00000018 FDE cie=00000000 pc=00000000..00000010
+  DW_CFA_advance_loc: 4 to 00000004
+  DW_CFA_def_cfa_offset: 48
+  DW_CFA_offset: r13 at cfa-48
+  DW_CFA_advance_loc: 4 to 00000008
+  DW_CFA_def_cfa_offset: 52
+  DW_CFA_offset: r14 at cfa-44
+  DW_CFA_offset: r15 at cfa-40
+  DW_CFA_advance_loc: 4 to 0000000c
+  DW_CFA_offset: r27 at cfa-52
+  DW_CFA_advance_loc: 2 to 0000000e
+  DW_CFA_def_cfa_register: r27
+  DW_CFA_nop
+
diff --git a/gas/testsuite/gas/cfi/cfi-arc-1.s b/gas/testsuite/gas/cfi/cfi-arc-1.s
new file mode 100644
index 0000000..5d4f99d
--- /dev/null
+++ b/gas/testsuite/gas/cfi/cfi-arc-1.s
@@ -0,0 +1,21 @@
+	.file	"foo.c"
+	.cpu HS
+	.section	.text
+	.align	4
+	.cfi_startproc
+foo:
+	st.a r13,[sp,-48]
+	.cfi_def_cfa_offset 48
+	.cfi_offset r13, -48
+.LCFI0:
+	std r14,[sp,4]
+	.cfi_adjust_cfa_offset 4
+	.cfi_offset r14, -44
+	.cfi_rel_offset r15, 12
+	st.a fp,[sp,-4]
+	.cfi_rel_offset fp, 0
+	mov_s fp,sp
+	.cfi_def_cfa_register fp
+	j_s	[blink]
+	.cfi_endproc
+	.size	foo, .-foo
diff --git a/gas/testsuite/gas/cfi/cfi.exp b/gas/testsuite/gas/cfi/cfi.exp
index 379e6f4..4a8d3ba 100644
--- a/gas/testsuite/gas/cfi/cfi.exp
+++ b/gas/testsuite/gas/cfi/cfi.exp
@@ -91,7 +91,8 @@ if  { [istarget "i*86-*-*"] || [istarget "x86_64-*-*"] } then {
     } else {
 	run_dump_test "cfi-sh-1"
     }
-
+} elseif { [istarget "arc*-*-*"] } then {
+    run_dump_test "cfi-arc-1"
 } elseif { [istarget "arm*-*"] } then {
     # Only ELF based ARM targets support CFI.
     if { [is_pecoff_format] } then {