[PATCH] xtensa: fix signedness of gas relocations

[Max Filippov]

Change 1058c7532d0b "Use signed data type for R_XTENSA_DIFF* relocation
offsets." changed signedness of BFD_RELOC_XTENSA_DIFF* relocations
substituted for BFD_RELOC_*. This made it impossible to encode arbitrary
8-, 16- and 32-bit values, which broke e.g. debug info encoding by .loc
directive. Revert this part and add test.

gas/
2016-02-03  Max Filippov  <jcmvbkbc@gmail.com>
	* config/tc-xtensa.c (md_apply_fix): Mark BFD_RELOC_XTENSA_DIFF*
	substitutions for BFD_RELOC_* as unsigned.

gas/testsuite/
2016-02-03  Max Filippov  <jcmvbkbc@gmail.com>
	* gas/xtensa/all.exp: Add loc to list of xtensa tests.
	* gas/xtensa/loc.d: New file: loc test result patterns.
	* gas/xtensa/loc.s: New file: loc test.
---
 gas/config/tc-xtensa.c           |  6 +++---
 gas/testsuite/gas/xtensa/all.exp |  1 +
 gas/testsuite/gas/xtensa/loc.d   | 10 ++++++++++
 gas/testsuite/gas/xtensa/loc.s   |  7 +++++++
 4 files changed, 21 insertions(+), 3 deletions(-)
 create mode 100644 gas/testsuite/gas/xtensa/loc.d
 create mode 100644 gas/testsuite/gas/xtensa/loc.s

diff --git a/gas/config/tc-xtensa.c b/gas/config/tc-xtensa.c
index a119871..36a06cc 100644
--- a/gas/config/tc-xtensa.c
+++ b/gas/config/tc-xtensa.c
@@ -5961,15 +5961,15 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg)
 	    {
 	    case BFD_RELOC_8:
 	      fixP->fx_r_type = BFD_RELOC_XTENSA_DIFF8;
-	      fixP->fx_signed = 1;
+	      fixP->fx_signed = 0;
 	      break;
 	    case BFD_RELOC_16:
 	      fixP->fx_r_type = BFD_RELOC_XTENSA_DIFF16;
-	      fixP->fx_signed = 1;
+	      fixP->fx_signed = 0;
 	      break;
 	    case BFD_RELOC_32:
 	      fixP->fx_r_type = BFD_RELOC_XTENSA_DIFF32;
-	      fixP->fx_signed = 1;
+	      fixP->fx_signed = 0;
 	      break;
 	    default:
 	      break;
diff --git a/gas/testsuite/gas/xtensa/all.exp b/gas/testsuite/gas/xtensa/all.exp
index 31b725b..7ff7bd7 100644
--- a/gas/testsuite/gas/xtensa/all.exp
+++ b/gas/testsuite/gas/xtensa/all.exp
@@ -101,6 +101,7 @@ if [istarget xtensa*-*-*] then {
     run_dump_test "trampoline"
     run_dump_test "first_frag_align"
     run_dump_test "auto-litpools"
+    run_dump_test "loc"
 }
 
 if [info exists errorInfo] then {
diff --git a/gas/testsuite/gas/xtensa/loc.d b/gas/testsuite/gas/xtensa/loc.d
new file mode 100644
index 0000000..71983cc
--- /dev/null
+++ b/gas/testsuite/gas/xtensa/loc.d
@@ -0,0 +1,10 @@
+#as:
+#objdump: -r
+#name: .loc directive relocs
+
+.*: +file format .*xtensa.*
+
+RELOCATION RECORDS FOR \[\.debug_line\]:
+#...
+.*R_XTENSA_DIFF16.*\.text\+0x00009c42
+#...
diff --git a/gas/testsuite/gas/xtensa/loc.s b/gas/testsuite/gas/xtensa/loc.s
new file mode 100644
index 0000000..029e14e
--- /dev/null
+++ b/gas/testsuite/gas/xtensa/loc.s
@@ -0,0 +1,7 @@
+	.text
+	.file 1 "loc.s"
+	.loc 1 3
+	nop
+	.space 40000
+	.loc 1 5
+	nop
-- 
2.1.4