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libmach: disassemble DMB, DSB, and ISB correctly

the arm v7 manual says these have an immediate like they do in arm v8

--- a/sys/src/libmach/5db.c

+++ b/sys/src/libmach/5db.c

@@ -192,7 +192,7 @@

 		op = (48) + ((w >> 21) & 0xf);

 		break;

 	case 2:	/* load/store byte/word i(r) */

-		if ((w & 0xffffff8f) == 0xf57ff00f) {	/* barriers, clrex */

+		if ((w & 0xffffff80) == 0xf57ff000) {	/* barriers, clrex */

 			done = 1;

 			switch ((w >> 4) & 7) {

 			case 1:

@@ -589,6 +589,13 @@

 	format(o->o, i, buf);

 }

+static void

+armdmb(Opcode *o, Instr *i)

+{

+	i->imm = (i->w & 0xf);

+	format(o->o, i, o->a);

+}

+

 static int

 armcondpass(Map *map, Rgetter rget, uchar cond)

 {

@@ -973,9 +980,9 @@

 	"CLREX",	armunk, 0,	"",

 /* 96 */

-	"DSB",		armunk, 0,	"",

-	"DMB",		armunk, 0,	"",

-	"ISB",		armunk, 0,	"",

+	"DSB",		armdmb, 0,	"$%i",

+	"DMB",		armdmb, 0,	"$%i",

+	"ISB",		armdmb, 0,	"$%i",

 /* 99 */

 	"RFEV7%P%a",	armbdt, 0,	"(R%n)",

-- 

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