MIPS/opcodes: Fix undecoded MIPS16 extended instruction bit disassembly

Correct the disassembly of hardware don't cares in MIPS16 extended
instructions.  Rather than e.g.:

   0:	f008 0231 	addiu	v0,sp,16433
   4:	f520 3260 	sll	v0,v1,-12

print:

   0:	f008 0231 	addiu	v0,sp,16401
   4:	f520 3260 	sll	v0,v1,20

respectively instead.

	opcodes/
	* mips-dis.c (print_mips16_insn_arg): Mask unused extended
	instruction bits out.

	binutils/
	* testsuite/binutils-all/mips/mips16-undecoded.d: New test.
	* testsuite/binutils-all/mips/mips16-undecoded.s: New test
	source.
	* testsuite/binutils-all/mips/mips.exp: Run the new test.

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index b4f528687fe539837d699dce9ec83ee14b432fe8..89d8767f44246eccebe8a02fb9d7cfb10f1d0b8b 100644 (file)
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,10 @@
+2016-04-11  Maciej W. Rozycki  <macro@imgtec.com>
+
+       * testsuite/binutils-all/mips/mips16-undecoded.d: New test.
+       * testsuite/binutils-all/mips/mips16-undecoded.s: New test
+       source.
+       * testsuite/binutils-all/mips/mips.exp: Run the new test.
+
 2016-04-04  Nick Clifton  <nickc@redhat.com>
 
        PR 19872

diff --git a/binutils/testsuite/binutils-all/mips/mips.exp b/binutils/testsuite/binutils-all/mips/mips.exp
index 4fbb0302d0493d7f45232a425ededc0b666f71ee..5c939596b21daa8448e53d678fbeb17ddf91bc13 100644 (file)
--- a/binutils/testsuite/binutils-all/mips/mips.exp
+++ b/binutils/testsuite/binutils-all/mips/mips.exp
@@ -22,4 +22,5 @@ if ![istarget mips*-*-*] {
 if [is_elf_format] {
     run_dump_test "mixed-mips16"
     run_dump_test "mixed-micromips"
+    run_dump_test "mips16-undecoded"
 }

diff --git a/binutils/testsuite/binutils-all/mips/mips16-undecoded.d b/binutils/testsuite/binutils-all/mips/mips16-undecoded.d
new file mode 100644 (file)
index 0000000..42a5cdf
--- /dev/null
+++ b/binutils/testsuite/binutils-all/mips/mips16-undecoded.d
@@ -0,0 +1,168 @@
+#PROG: objcopy
+#objdump: -dr --prefix-addresses --show-raw-insn
+#name: MIPS16 undecoded extended instruction field disassembly
+#as: -32
+
+.*: +file format .*mips.*
+
+Disassembly of section \.text:
+[0-9a-f]+ <[^>]*> f008 0211    addiu   v0,sp,16401
+[0-9a-f]+ <[^>]*> f008 0211    addiu   v0,sp,16401
+[0-9a-f]+ <[^>]*> f008 0231    addiu   v0,sp,16401
+[0-9a-f]+ <[^>]*> f008 0251    addiu   v0,sp,16401
+[0-9a-f]+ <[^>]*> f008 0291    addiu   v0,sp,16401
+[0-9a-f]+ <[^>]*> f008 0a11    la      v0,00004024 <foo\+0x4024>
+[0-9a-f]+ <[^>]*> f008 0a11    la      v0,00004028 <foo\+0x4028>
+[0-9a-f]+ <[^>]*> f008 0a31    la      v0,0000402c <foo\+0x402c>
+[0-9a-f]+ <[^>]*> f008 0a51    la      v0,00004030 <foo\+0x4030>
+[0-9a-f]+ <[^>]*> f008 0a91    la      v0,00004034 <foo\+0x4034>
+[0-9a-f]+ <[^>]*> f008 1011    b       0000804e <foo\+0x804e>
+[0-9a-f]+ <[^>]*> f008 1011    b       00008052 <foo\+0x8052>
+[0-9a-f]+ <[^>]*> f008 1031    b       00008056 <foo\+0x8056>
+[0-9a-f]+ <[^>]*> f008 1051    b       0000805a <foo\+0x805a>
+[0-9a-f]+ <[^>]*> f008 1091    b       0000805e <foo\+0x805e>
+[0-9a-f]+ <[^>]*> f008 1111    b       00008062 <foo\+0x8062>
+[0-9a-f]+ <[^>]*> f008 1211    b       00008066 <foo\+0x8066>
+[0-9a-f]+ <[^>]*> f008 1411    b       0000806a <foo\+0x806a>
+[0-9a-f]+ <[^>]*> f008 2211    beqz    v0,0000806e <foo\+0x806e>
+[0-9a-f]+ <[^>]*> f008 2211    beqz    v0,00008072 <foo\+0x8072>
+[0-9a-f]+ <[^>]*> f008 2231    beqz    v0,00008076 <foo\+0x8076>
+[0-9a-f]+ <[^>]*> f008 2251    beqz    v0,0000807a <foo\+0x807a>
+[0-9a-f]+ <[^>]*> f008 2291    beqz    v0,0000807e <foo\+0x807e>
+[0-9a-f]+ <[^>]*> f008 2a11    bnez    v0,00008082 <foo\+0x8082>
+[0-9a-f]+ <[^>]*> f008 2a11    bnez    v0,00008086 <foo\+0x8086>
+[0-9a-f]+ <[^>]*> f008 2a31    bnez    v0,0000808a <foo\+0x808a>
+[0-9a-f]+ <[^>]*> f008 2a51    bnez    v0,0000808e <foo\+0x808e>
+[0-9a-f]+ <[^>]*> f008 2a91    bnez    v0,00008092 <foo\+0x8092>
+[0-9a-f]+ <[^>]*> f008 4a11    addiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 4a11    addiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 4a31    addiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 4a51    addiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 4a91    addiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 5211    slti    v0,16401
+[0-9a-f]+ <[^>]*> f008 5211    slti    v0,16401
+[0-9a-f]+ <[^>]*> f008 5231    slti    v0,16401
+[0-9a-f]+ <[^>]*> f008 5251    slti    v0,16401
+[0-9a-f]+ <[^>]*> f008 5291    slti    v0,16401
+[0-9a-f]+ <[^>]*> f008 5a11    sltiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 5a11    sltiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 5a31    sltiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 5a51    sltiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 5a91    sltiu   v0,16401
+[0-9a-f]+ <[^>]*> f008 6a11    li      v0,16401
+[0-9a-f]+ <[^>]*> f008 6a11    li      v0,16401
+[0-9a-f]+ <[^>]*> f008 6a31    li      v0,16401
+[0-9a-f]+ <[^>]*> f008 6a51    li      v0,16401
+[0-9a-f]+ <[^>]*> f008 6a91    li      v0,16401
+[0-9a-f]+ <[^>]*> f008 7211    cmpi    v0,16401
+[0-9a-f]+ <[^>]*> f008 7211    cmpi    v0,16401
+[0-9a-f]+ <[^>]*> f008 7231    cmpi    v0,16401
+[0-9a-f]+ <[^>]*> f008 7251    cmpi    v0,16401
+[0-9a-f]+ <[^>]*> f008 7291    cmpi    v0,16401
+[0-9a-f]+ <[^>]*> f008 9211    lw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 9211    lw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 9231    lw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 9251    lw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 9291    lw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 b211    lw      v0,000040f8 <foo\+0x40f8>
+[0-9a-f]+ <[^>]*> f008 b211    lw      v0,000040fc <foo\+0x40fc>
+[0-9a-f]+ <[^>]*> f008 b231    lw      v0,00004100 <foo\+0x4100>
+[0-9a-f]+ <[^>]*> f008 b251    lw      v0,00004104 <foo\+0x4104>
+[0-9a-f]+ <[^>]*> f008 b291    lw      v0,00004108 <foo\+0x4108>
+[0-9a-f]+ <[^>]*> f008 d211    sw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 d211    sw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 d231    sw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 d251    sw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 d291    sw      v0,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 6011    bteqz   00008136 <foo\+0x8136>
+[0-9a-f]+ <[^>]*> f008 6011    bteqz   0000813a <foo\+0x813a>
+[0-9a-f]+ <[^>]*> f008 6031    bteqz   0000813e <foo\+0x813e>
+[0-9a-f]+ <[^>]*> f008 6051    bteqz   00008142 <foo\+0x8142>
+[0-9a-f]+ <[^>]*> f008 6091    bteqz   00008146 <foo\+0x8146>
+[0-9a-f]+ <[^>]*> f008 6111    btnez   0000814a <foo\+0x814a>
+[0-9a-f]+ <[^>]*> f008 6111    btnez   0000814e <foo\+0x814e>
+[0-9a-f]+ <[^>]*> f008 6131    btnez   00008152 <foo\+0x8152>
+[0-9a-f]+ <[^>]*> f008 6151    btnez   00008156 <foo\+0x8156>
+[0-9a-f]+ <[^>]*> f008 6191    btnez   0000815a <foo\+0x815a>
+[0-9a-f]+ <[^>]*> f008 6211    sw      ra,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 6211    sw      ra,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 6231    sw      ra,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 6251    sw      ra,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 6291    sw      ra,16401\(sp\)
+[0-9a-f]+ <[^>]*> f008 6311    addiu   sp,16401
+[0-9a-f]+ <[^>]*> f008 6311    addiu   sp,16401
+[0-9a-f]+ <[^>]*> f008 6331    addiu   sp,16401
+[0-9a-f]+ <[^>]*> f008 6351    addiu   sp,16401
+[0-9a-f]+ <[^>]*> f008 6391    addiu   sp,16401
+[0-9a-f]+ <[^>]*> f500 3260    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3260    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3264    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3268    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3270    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f501 3260    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f502 3260    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f504 3260    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f508 3260    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f510 3260    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f520 3260    sll     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3261    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3261    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3265    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3269    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3271    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f501 3261    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f502 3261    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f504 3261    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f508 3261    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f510 3261    dsll    v0,v1,20
+[0-9a-f]+ <[^>]*> f520 3261    dsll    v0,v1,52
+[0-9a-f]+ <[^>]*> f500 3262    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3262    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3266    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 326a    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3272    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f501 3262    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f502 3262    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f504 3262    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f508 3262    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f510 3262    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f520 3262    srl     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3263    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3263    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3267    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 326b    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 3273    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f501 3263    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f502 3263    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f504 3263    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f508 3263    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f510 3263    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f520 3263    sra     v0,v1,20
+[0-9a-f]+ <[^>]*> f500 e848    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f500 e848    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f500 e948    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f500 ea48    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f500 ec48    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f501 e848    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f502 e848    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f504 e848    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f508 e848    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f510 e848    dsrl    v0,20
+[0-9a-f]+ <[^>]*> f520 e848    dsrl    v0,52
+[0-9a-f]+ <[^>]*> f500 e853    dsra    v0,20
+[0-9a-f]+ <[^>]*> f500 e853    dsra    v0,20
+[0-9a-f]+ <[^>]*> f500 e953    dsra    v0,20
+[0-9a-f]+ <[^>]*> f500 ea53    dsra    v0,20
+[0-9a-f]+ <[^>]*> f500 ec53    dsra    v0,20
+[0-9a-f]+ <[^>]*> f501 e853    dsra    v0,20
+[0-9a-f]+ <[^>]*> f502 e853    dsra    v0,20
+[0-9a-f]+ <[^>]*> f504 e853    dsra    v0,20
+[0-9a-f]+ <[^>]*> f508 e853    dsra    v0,20
+[0-9a-f]+ <[^>]*> f510 e853    dsra    v0,20
+[0-9a-f]+ <[^>]*> f520 e853    dsra    v0,52
+[0-9a-f]+ <[^>]*> f008 fb11    daddiu  sp,16401
+[0-9a-f]+ <[^>]*> f008 fb11    daddiu  sp,16401
+[0-9a-f]+ <[^>]*> f008 fb31    daddiu  sp,16401
+[0-9a-f]+ <[^>]*> f008 fb51    daddiu  sp,16401
+[0-9a-f]+ <[^>]*> f008 fb91    daddiu  sp,16401
+       \.\.\.

diff --git a/binutils/testsuite/binutils-all/mips/mips16-undecoded.s b/binutils/testsuite/binutils-all/mips/mips16-undecoded.s
new file mode 100644 (file)
index 0000000..2736ae4
--- /dev/null
+++ b/binutils/testsuite/binutils-all/mips/mips16-undecoded.s
@@ -0,0 +1,198 @@
+       .text
+       .set    mips3
+       .set    mips16
+       .globl  foo
+       .ent    foo
+foo:
+       # Individual major opcodes.
+       addiu   $2, $sp, 0x4011
+       .half   0xf008, 0x0211
+       .half   0xf008, 0x0231
+       .half   0xf008, 0x0251
+       .half   0xf008, 0x0291
+
+       addiu   $2, $pc, 0x4011
+       .half   0xf008, 0x0a11
+       .half   0xf008, 0x0a31
+       .half   0xf008, 0x0a51
+       .half   0xf008, 0x0a91
+
+       b       . + 0x8026
+       .half   0xf008, 0x1011
+       .half   0xf008, 0x1031
+       .half   0xf008, 0x1051
+       .half   0xf008, 0x1091
+       .half   0xf008, 0x1111
+       .half   0xf008, 0x1211
+       .half   0xf008, 0x1411
+
+       beqz    $2, . + 0x8026
+       .half   0xf008, 0x2211
+       .half   0xf008, 0x2231
+       .half   0xf008, 0x2251
+       .half   0xf008, 0x2291
+
+       bnez    $2, . + 0x8026
+       .half   0xf008, 0x2a11
+       .half   0xf008, 0x2a31
+       .half   0xf008, 0x2a51
+       .half   0xf008, 0x2a91
+
+       addiu   $2, 0x4011
+       .half   0xf008, 0x4a11
+       .half   0xf008, 0x4a31
+       .half   0xf008, 0x4a51
+       .half   0xf008, 0x4a91
+
+       slti    $2, 0x4011
+       .half   0xf008, 0x5211
+       .half   0xf008, 0x5231
+       .half   0xf008, 0x5251
+       .half   0xf008, 0x5291
+
+       sltiu   $2, 0x4011
+       .half   0xf008, 0x5a11
+       .half   0xf008, 0x5a31
+       .half   0xf008, 0x5a51
+       .half   0xf008, 0x5a91
+
+       li      $2, 0x4011
+       .half   0xf008, 0x6a11
+       .half   0xf008, 0x6a31
+       .half   0xf008, 0x6a51
+       .half   0xf008, 0x6a91
+
+       cmpi    $2, 0x4011
+       .half   0xf008, 0x7211
+       .half   0xf008, 0x7231
+       .half   0xf008, 0x7251
+       .half   0xf008, 0x7291
+
+       lw      $2, 0x4011($sp)
+       .half   0xf008, 0x9211
+       .half   0xf008, 0x9231
+       .half   0xf008, 0x9251
+       .half   0xf008, 0x9291
+
+       lw      $2, 0x4011($pc)
+       .half   0xf008, 0xb211
+       .half   0xf008, 0xb231
+       .half   0xf008, 0xb251
+       .half   0xf008, 0xb291
+
+       sw      $2, 0x4011($sp)
+       .half   0xf008, 0xd211
+       .half   0xf008, 0xd231
+       .half   0xf008, 0xd251
+       .half   0xf008, 0xd291
+
+       # I8 major opcode.
+       bteqz   . + 0x8026
+       .half   0xf008, 0x6011
+       .half   0xf008, 0x6031
+       .half   0xf008, 0x6051
+       .half   0xf008, 0x6091
+
+       btnez   . + 0x8026
+       .half   0xf008, 0x6111
+       .half   0xf008, 0x6131
+       .half   0xf008, 0x6151
+       .half   0xf008, 0x6191
+
+       sw      $ra, 0x4011($sp)
+       .half   0xf008, 0x6211
+       .half   0xf008, 0x6231
+       .half   0xf008, 0x6251
+       .half   0xf008, 0x6291
+
+       addiu   $sp, 0x4011
+       .half   0xf008, 0x6311
+       .half   0xf008, 0x6331
+       .half   0xf008, 0x6351
+       .half   0xf008, 0x6391
+
+       # SHIFT major opcode
+       sll     $2, $3, 0x14
+       .half   0xf500, 0x3260
+       .half   0xf500, 0x3264
+       .half   0xf500, 0x3268
+       .half   0xf500, 0x3270
+       .half   0xf501, 0x3260
+       .half   0xf502, 0x3260
+       .half   0xf504, 0x3260
+       .half   0xf508, 0x3260
+       .half   0xf510, 0x3260
+       .half   0xf520, 0x3260
+
+       dsll    $2, $3, 0x14
+       .half   0xf500, 0x3261
+       .half   0xf500, 0x3265
+       .half   0xf500, 0x3269
+       .half   0xf500, 0x3271
+       .half   0xf501, 0x3261
+       .half   0xf502, 0x3261
+       .half   0xf504, 0x3261
+       .half   0xf508, 0x3261
+       .half   0xf510, 0x3261
+       .half   0xf520, 0x3261
+
+       srl     $2, $3, 0x14
+       .half   0xf500, 0x3262
+       .half   0xf500, 0x3266
+       .half   0xf500, 0x326a
+       .half   0xf500, 0x3272
+       .half   0xf501, 0x3262
+       .half   0xf502, 0x3262
+       .half   0xf504, 0x3262
+       .half   0xf508, 0x3262
+       .half   0xf510, 0x3262
+       .half   0xf520, 0x3262
+
+       sra     $2, $3, 0x14
+       .half   0xf500, 0x3263
+       .half   0xf500, 0x3267
+       .half   0xf500, 0x326b
+       .half   0xf500, 0x3273
+       .half   0xf501, 0x3263
+       .half   0xf502, 0x3263
+       .half   0xf504, 0x3263
+       .half   0xf508, 0x3263
+       .half   0xf510, 0x3263
+       .half   0xf520, 0x3263
+
+       # RR major opcode
+       dsrl    $2, 0x14
+       .half   0xf500, 0xe848
+       .half   0xf500, 0xe948
+       .half   0xf500, 0xea48
+       .half   0xf500, 0xec48
+       .half   0xf501, 0xe848
+       .half   0xf502, 0xe848
+       .half   0xf504, 0xe848
+       .half   0xf508, 0xe848
+       .half   0xf510, 0xe848
+       .half   0xf520, 0xe848
+
+       dsra    $2, 0x14
+       .half   0xf500, 0xe853
+       .half   0xf500, 0xe953
+       .half   0xf500, 0xea53
+       .half   0xf500, 0xec53
+       .half   0xf501, 0xe853
+       .half   0xf502, 0xe853
+       .half   0xf504, 0xe853
+       .half   0xf508, 0xe853
+       .half   0xf510, 0xe853
+       .half   0xf520, 0xe853
+
+       # I64 major opcode.
+       daddiu  $sp, 0x4011
+       .half   0xf008, 0xfb11
+       .half   0xf008, 0xfb31
+       .half   0xf008, 0xfb51
+       .half   0xf008, 0xfb91
+       .end    foo
+
+# Force some (non-delay-slot) zero bytes, to make 'objdump' print ...
+       .align  4, 0
+       .space  16

diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index a91544e0be507fac449f2394b8b683424e61c245..4d23c24306f715ffc89218358a4be4d00a4db926 100644 (file)
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,8 @@
+2016-04-11  Maciej W. Rozycki  <macro@imgtec.com>
+
+       * mips-dis.c (print_mips16_insn_arg): Mask unused extended
+       instruction bits out.
+
 2016-04-07  Andrew Burgess  <andrew.burgess@embecosm.com>
 
        * arc-nps400-tbl.h: Add schd, sync, and hwschd instructions.

diff --git a/opcodes/mips-dis.c b/opcodes/mips-dis.c
index e152876646131099027e6b5cc328c8274e926a94..7822295eceb629c2997840619ffbe0aa9a34fe43 100644 (file)
--- a/opcodes/mips-dis.c
+++ b/opcodes/mips-dis.c
@@ -1894,11 +1894,13 @@ print_mips16_insn_arg (struct disassemble_info *info,
                {
                  operand = ext_operand;
                  if (operand->size == 16)
-                   uval |= ((extend & 0x1f) << 11) | (extend & 0x7e0);
+                   uval = (((extend & 0x1f) << 11) | (extend & 0x7e0)
+                           | (uval & 0x1f));
                  else if (operand->size == 15)
                    uval |= ((extend & 0xf) << 11) | (extend & 0x7f0);
                  else
-                   uval = ((extend >> 6) & 0x1f) | (extend & 0x20);
+                   uval = ((((extend >> 6) & 0x1f) | (extend & 0x20))
+                           & ((1U << operand->size) - 1));
                }
            }
        }