cmd/internal/obj/arm: remove illegal form of the SWI instruction

SWI only support "SWI $imm", but currently "SWI (Reg)" is also
accepted. This patch fixes it.

And more instruction tests are added to cmd/asm/internal/asm/testdata/arm.s

fixes #20375

Change-Id: Id437d853924a403e41da9b6cbddd20d994b624ff
Reviewed-on: https://go-review.googlesource.com/43552
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

src/cmd/asm/internal/asm/testdata/arm.s

@@ -103,9 +103,9 @@ TEXT	foo(SB), DUPOK|NOSPLIT, $0
 //	{
 //		outcode($1, $2, &nullgen, 0, &$4);
 //	}
-	SWI.S	$2
-	SWI.S	(R1)
-//	SWI.S	foo(SB) - TODO: classifying foo(SB) as C_TLS_LE
+	SWI	$2
+	SWI	$3
+//	SWI	foo(SB) - TODO: classifying foo(SB) as C_TLS_LE
 
 //
 // CMP
@@ -948,16 +948,28 @@ jmp_label_3:
 	SLL.S	R5, R7               // 1775b0e1
 
 // MULA / MULS
-	MULAWT	R1, R2, R3, R4       // c23124e1
-	MULAWB	R1, R2, R3, R4       // 823124e1
-	MULS	R1, R2, R3, R4       // 923164e0
-	MULA	R1, R2, R3, R4       // 923124e0
-	MULA.S	R1, R2, R3, R4       // 923134e0
-	MMULA	R1, R2, R3, R4       // 123154e7
-	MMULS	R1, R2, R3, R4       // d23154e7
-	MULABB	R1, R2, R3, R4       // 823104e1
+	MULAWT		R1, R2, R3, R4       // c23124e1
+	MULAWB		R1, R2, R3, R4       // 823124e1
+	MULS		R1, R2, R3, R4       // 923164e0
+	MULA		R1, R2, R3, R4       // 923124e0
+	MULA.S		R1, R2, R3, R4       // 923134e0
+	MMULA		R1, R2, R3, R4       // 123154e7
+	MMULS		R1, R2, R3, R4       // d23154e7
+	MULABB		R1, R2, R3, R4       // 823104e1
+	MULAL		R1, R2, (R4, R3)     // 9231e4e0
+	MULAL.S		R1, R2, (R4, R3)     // 9231f4e0
+	MULALU		R1, R2, (R4, R3)     // 9231a4e0
+	MULALU.S	R1, R2, (R4, R3)     // 9231b4e0
 
 // MUL
+	MUL	R2, R3, R4           // 930204e0
+	MUL.S	R2, R3, R4           // 930214e0
+	MULU	R5, R6, R7           // 960507e0
+	MULU.S	R5, R6, R7           // 960517e0
+	MULLU	R1, R2, (R4, R3)     // 923184e0
+	MULLU.S	R1, R2, (R4, R3)     // 923194e0
+	MULL	R1, R2, (R4, R3)     // 9231c4e0
+	MULL.S	R1, R2, (R4, R3)     // 9231d4e0
 	MMUL	R1, R2, R3           // 12f153e7
 	MULBB	R1, R2, R3           // 82f163e1
 	MULWB	R1, R2, R3           // a20123e1
@@ -976,6 +988,21 @@ jmp_label_3:
 	DIVHW	R0, R1               // 11f011e7
 	DIVUHW	R0, R1               // 11f031e7
 
+// misc
+	CLZ	R1, R2         // 112f6fe1
+	WORD	$0             // 00000000
+	WORD	$4294967295    // ffffffff
+	WORD	$2863311530    // aaaaaaaa
+	WORD	$1431655765    // 55555555
+	PLD	4080(R6)       // f0ffd6f5
+	PLD	-4080(R9)      // f0ff59f5
+	RFE	               // 0080fde8
+	SWPW	R3, (R7), R9   // SWPW  (R7), R3, R9 // 939007e1
+	SWPBU	R4, (R2), R8   // SWPBU (R2), R4, R8 // 948042e1
+	SWI	$0             // 000000ef
+	SWI	$65535         // ffff00ef
+	SWI	               // 000000ef
+
 //
 // END
 //

src/cmd/internal/obj/arm/asm5.go

@@ -127,7 +127,6 @@ var optab = []Optab{
 	{ASLL, C_REG, C_NONE, C_REG, 9, 4, 0, 0, 0},
 	{ASLL, C_REG, C_REG, C_REG, 9, 4, 0, 0, 0},
 	{ASWI, C_NONE, C_NONE, C_NONE, 10, 4, 0, 0, 0},
-	{ASWI, C_NONE, C_NONE, C_LOREG, 10, 4, 0, 0, 0},
 	{ASWI, C_NONE, C_NONE, C_LCON, 10, 4, 0, 0, 0},
 	{AWORD, C_NONE, C_NONE, C_LCON, 11, 4, 0, 0, 0},
 	{AWORD, C_NONE, C_NONE, C_LCONADDR, 11, 4, 0, 0, 0},