MIPS/GAS: Use the module level ISA setting for R6 relaxation

Use the module level ISA setting rather than the last ISA selected with
a `.set' directive in the source file in determination as to whether to
keep PC-relative relocations and then with the original symbol referred,
for the purpose of R6 linker relaxation.

This is so that with e.g. code like this:

	b	foo
	.set	mips32r2
	...

it's the command line options or any `.module' directive that decides
how to encode any relocation for `foo' rather than the presence of `.set
mips32r2'.

	gas/
	* config/tc-mips.c (mips_force_relocation): Use `file_mips_opts'
	rather than `mips_opts' for the R6 ISA check.
	(mips_fix_adjustable): Likewise.
	* testsuite/gas/mips/pcrel-reloc-1.d: New test.
	* testsuite/gas/mips/pcrel-reloc-1-r6.d: New test.
	* testsuite/gas/mips/pcrel-reloc-2.d: New test.
	* testsuite/gas/mips/pcrel-reloc-2-r6.d: New test.
	* testsuite/gas/mips/pcrel-reloc-3.d: New test.
	* testsuite/gas/mips/pcrel-reloc-3-r6.d: New test.
	* testsuite/gas/mips/pcrel-reloc-1.s: New test source.
	* testsuite/gas/mips/mips.exp: Run the new tests.

10 files changed, 112 insertions, 2 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 4672d15..1e88b21 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,17 @@
+2016-06-21  Maciej W. Rozycki  <macro@imgtec.com>
+
+	* config/tc-mips.c (mips_force_relocation): Use `file_mips_opts'
+	rather than `mips_opts' for the R6 ISA check.
+	(mips_fix_adjustable): Likewise.
+	* testsuite/gas/mips/pcrel-reloc-1.d: New test.
+	* testsuite/gas/mips/pcrel-reloc-1-r6.d: New test.
+	* testsuite/gas/mips/pcrel-reloc-2.d: New test.
+	* testsuite/gas/mips/pcrel-reloc-2-r6.d: New test.
+	* testsuite/gas/mips/pcrel-reloc-3.d: New test.
+	* testsuite/gas/mips/pcrel-reloc-3-r6.d: New test.
+	* testsuite/gas/mips/pcrel-reloc-1.s: New test source.
+	* testsuite/gas/mips/mips.exp: Run the new tests.
+
 2016-06-21  Graham Markall  <graham.markall@embecosm.com>
 
 	* config/tc-arc.c (check_cpu_feature, md_parse_option):
diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c
index 1a472a3..ed64b68 100644
--- a/gas/config/tc-mips.c
+++ b/gas/config/tc-mips.c
@@ -14768,7 +14768,7 @@ mips_force_relocation (fixS *fixp)
     return 1;
 
   /* We want all PC-relative relocations to be kept for R6 relaxation.  */
-  if (ISA_IS_R6 (mips_opts.isa)
+  if (ISA_IS_R6 (file_mips_opts.isa)
       && (fixp->fx_r_type == BFD_RELOC_16_PCREL_S2
 	  || fixp->fx_r_type == BFD_RELOC_MIPS_21_PCREL_S2
 	  || fixp->fx_r_type == BFD_RELOC_MIPS_26_PCREL_S2
@@ -17137,7 +17137,7 @@ mips_fix_adjustable (fixS *fixp)
      Also, PC relative relocations for MIPS R6 need to be symbol rather than
      section relative to allow linker relaxations to be performed later on.  */
   if (limited_pcrel_reloc_p (fixp->fx_r_type)
-      && (HAVE_IN_PLACE_ADDENDS || ISA_IS_R6 (mips_opts.isa)))
+      && (HAVE_IN_PLACE_ADDENDS || ISA_IS_R6 (file_mips_opts.isa)))
     return 0;
 
   /* R_MIPS16_26 relocations against non-MIPS16 functions might resolve
diff --git a/gas/testsuite/gas/mips/mips.exp b/gas/testsuite/gas/mips/mips.exp
index 4071434..12ac64e 100644
--- a/gas/testsuite/gas/mips/mips.exp
+++ b/gas/testsuite/gas/mips/mips.exp
@@ -1316,6 +1316,13 @@ if { [istarget mips*-*-vxworks*] } {
 	run_dump_test "pcrel-4-64"
     }
 
+    run_dump_test "pcrel-reloc-1"
+    run_dump_test "pcrel-reloc-1-r6"
+    run_dump_test "pcrel-reloc-2"
+    run_dump_test "pcrel-reloc-2-r6"
+    run_dump_test "pcrel-reloc-3"
+    run_dump_test "pcrel-reloc-3-r6"
+
     run_dump_test_arches "attr-gnu-4-0" "-32" \
 				    [mips_arch_list_matching mips1]
     run_dump_test_arches "attr-gnu-4-0" "-64" \
diff --git a/gas/testsuite/gas/mips/pcrel-reloc-1-r6.d b/gas/testsuite/gas/mips/pcrel-reloc-1-r6.d
new file mode 100644
index 0000000..26348f4
--- /dev/null
+++ b/gas/testsuite/gas/mips/pcrel-reloc-1-r6.d
@@ -0,0 +1,21 @@
+#objdump: -dr --prefix-addresses --show-raw-insn
+#name: MIPS R6 local PC-relative relocations 1
+#as: -32 -mips32r6
+#source: pcrel-reloc-1.s
+
+.*: +file format .*mips.*
+
+Disassembly of section \.text:
+[0-9a-f]+ <[^>]*> 1000ffff 	b	00000000 <foo>
+[ 	]*[0-9a-f]+: R_MIPS_PC16	bar
+[0-9a-f]+ <[^>]*> 1000ffff 	b	00000004 <foo\+0x4>
+[ 	]*[0-9a-f]+: R_MIPS_PC16	bar
+[0-9a-f]+ <[^>]*> 1000ffff 	b	00000008 <foo\+0x8>
+[ 	]*[0-9a-f]+: R_MIPS_PC16	bar
+[0-9a-f]+ <[^>]*> 1000ffff 	b	0000000c <foo\+0xc>
+[ 	]*[0-9a-f]+: R_MIPS_PC16	bar
+[0-9a-f]+ <[^>]*> 00000000 	nop
+	\.\.\.
+[0-9a-f]+ <[^>]*> 03e00009 	jr	ra
+[0-9a-f]+ <[^>]*> 00000000 	nop
+	\.\.\.
diff --git a/gas/testsuite/gas/mips/pcrel-reloc-1.d b/gas/testsuite/gas/mips/pcrel-reloc-1.d
new file mode 100644
index 0000000..4d4d21f
--- /dev/null
+++ b/gas/testsuite/gas/mips/pcrel-reloc-1.d
@@ -0,0 +1,17 @@
+#objdump: -dr --prefix-addresses --show-raw-insn
+#name: MIPS local PC-relative relocations 1
+#as: -32
+#source: pcrel-reloc-1.s
+
+.*: +file format .*mips.*
+
+Disassembly of section \.text:
+[0-9a-f]+ <[^>]*> 10000007 	b	00000020 <bar>
+[0-9a-f]+ <[^>]*> 10000006 	b	00000020 <bar>
+[0-9a-f]+ <[^>]*> 10000005 	b	00000020 <bar>
+[0-9a-f]+ <[^>]*> 10000004 	b	00000020 <bar>
+[0-9a-f]+ <[^>]*> 00000000 	nop
+	\.\.\.
+[0-9a-f]+ <[^>]*> 03e00009 	jalr	zero,ra
+[0-9a-f]+ <[^>]*> 00000000 	nop
+	\.\.\.
diff --git a/gas/testsuite/gas/mips/pcrel-reloc-1.s b/gas/testsuite/gas/mips/pcrel-reloc-1.s
new file mode 100644
index 0000000..7ca8f30
--- /dev/null
+++ b/gas/testsuite/gas/mips/pcrel-reloc-1.s
@@ -0,0 +1,31 @@
+	.text
+	.align  4, 0
+	.globl	foo
+	.ent	foo
+	.set	noreorder
+foo:
+	b	bar
+	b	bar
+	b	bar
+	b	bar
+	.set	reorder
+	.end	foo
+
+# Force some (non-delay-slot) zero bytes, to make 'objdump' print ...
+	.align  4, 0
+	.space  16
+
+	.ent	bar
+	.ifdef	setmips3
+	.set	mips3
+	.endif
+	.ifdef	setmips64r6
+	.set	mips64r6
+	.endif
+bar:
+	jalr	$0, $ra
+	.end	bar
+
+# Force some (non-delay-slot) zero bytes, to make 'objdump' print ...
+	.align  16, 0
+	.space  16
diff --git a/gas/testsuite/gas/mips/pcrel-reloc-2-r6.d b/gas/testsuite/gas/mips/pcrel-reloc-2-r6.d
new file mode 100644
index 0000000..1a56084
--- /dev/null
+++ b/gas/testsuite/gas/mips/pcrel-reloc-2-r6.d
@@ -0,0 +1,5 @@
+#objdump: -dr --prefix-addresses --show-raw-insn
+#name: MIPS R6 local PC-relative relocations 2
+#as: -32 -mips32r6 --defsym setmips3=1
+#source: pcrel-reloc-1.s
+#dump: pcrel-reloc-1-r6.d
diff --git a/gas/testsuite/gas/mips/pcrel-reloc-2.d b/gas/testsuite/gas/mips/pcrel-reloc-2.d
new file mode 100644
index 0000000..25f7f7b
--- /dev/null
+++ b/gas/testsuite/gas/mips/pcrel-reloc-2.d
@@ -0,0 +1,5 @@
+#objdump: -dr --prefix-addresses --show-raw-insn
+#name: MIPS local PC-relative relocations 2
+#as: -32 --defsym setmips3=1
+#source: pcrel-reloc-1.s
+#dump: pcrel-reloc-1.d
diff --git a/gas/testsuite/gas/mips/pcrel-reloc-3-r6.d b/gas/testsuite/gas/mips/pcrel-reloc-3-r6.d
new file mode 100644
index 0000000..9211a0e
--- /dev/null
+++ b/gas/testsuite/gas/mips/pcrel-reloc-3-r6.d
@@ -0,0 +1,5 @@
+#objdump: -dr --prefix-addresses --show-raw-insn
+#name: MIPS R6 local PC-relative relocations 3
+#as: -32 -mips32r6 --defsym setmips64r6=1
+#source: pcrel-reloc-1.s
+#dump: pcrel-reloc-1-r6.d
diff --git a/gas/testsuite/gas/mips/pcrel-reloc-3.d b/gas/testsuite/gas/mips/pcrel-reloc-3.d
new file mode 100644
index 0000000..cb587b9
--- /dev/null
+++ b/gas/testsuite/gas/mips/pcrel-reloc-3.d
@@ -0,0 +1,5 @@
+#objdump: -dr --prefix-addresses --show-raw-insn
+#name: MIPS local PC-relative relocations 3
+#as: -32 --defsym setmips64r6=1
+#source: pcrel-reloc-1.s
+#dump: pcrel-reloc-1.d