tests/misc: Add an icbi test

We have a bug where an icbi can cause an instruction to execute twice.
Add a test case for this.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>

tests/misc/head.S

@@ -185,3 +185,33 @@ test_loadhitstore:
 	or	%r7,%r6,%r7
 	subf	%r3,%r0,%r7
 	blr
+
+/* Test for double execution of addi */
+.balign 64
+	.global test_icbi
+test_icbi:
+1:	li	%r3,0
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	icbi	0,%r0
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	addi	%r3,%r3,1
+	blr

tests/misc/misc.c

@@ -16,6 +16,7 @@ extern long test_mfpvr(void);
 extern long test_mtpvr(void);
 extern long test_bdnzl(void);
 extern long test_loadhitstore(void);
+extern long test_icbi(void);
 
 // i < 100
 void print_test_number(int i)
@@ -74,5 +75,12 @@ int main(void)
 	} else
 		puts(PASS);
 
+	print_test_number(7);
+	if (test_icbi() != 1) {
+		fail = 1;
+		puts(FAIL);
+	} else
+		puts(PASS);
+
 	return fail;
 }

tests/test_misc.console_out

@@ -4,3 +4,4 @@ Test 03:PASS
 Test 04:PASS
 Test 05:PASS
 Test 06:PASS
+Test 07:PASS