xtensa: fix signedness of gas relocations

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/gas/xtensa/all.exp: Add loc to list of xtensa
	tests.
	* gas/testsuite/gas/xtensa/loc.d: New file: loc test result
	patterns.
	* gas/testsuite/gas/xtensa/loc.s: New file: loc test.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index da426fc..e147013 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,13 @@
+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/gas/xtensa/all.exp: Add loc to list of xtensa
+       tests.
+       * gas/testsuite/gas/xtensa/loc.d: New file: loc test result
+       patterns.
+       * gas/testsuite/gas/xtensa/loc.s: New file: loc test.
+
 2016-02-03  Kevin Buettner  <kevinb@redhat.com>
 
        * config/tc-msp430.h (DWARF2_ADDR_SIZE): Set to 4.

diff --git a/gas/config/tc-xtensa.c b/gas/config/tc-xtensa.c
index a119871..36a06cc 100644 (file)
--- 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 (file)
--- 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 (file)
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 (file)
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