minix/tests/arm: naive tests to cause data aborts

Some assembly code to cause unaligned access as well as
segmentation faults to exercise the data abort path.

Change-Id: Ie419114b76a8db849537a94fda781019cf14d50d

distrib/sets/lists/minix-tests/md.evbarm

@@ -0,0 +1,9 @@
+#
+# Sorted using sort_set.pl in releasetools.
+# to add an entry simply add it at the end of the
+# file and run
+# ../../../../releasetools/sort_set.pl < mi > out
+# mv out mi
+#
+./usr/tests/minix-posix/test_arm_segfault               minix-tests
+./usr/tests/minix-posix/test_arm_unaligned              minix-tests

minix/tests/Makefile

@@ -126,6 +126,8 @@ PROGS+=		test63 mod
 OBJS.${o} += common.o
 .endfor
 
+.include "./arch/${MACHINE_ARCH}/Makefile.inc"
+
 # LSC Make sure there is not leftover after a failed testrun
 clean: .PHONY .MAKE
 	@rm -rf DIR*

minix/tests/arch/earm/Makefile.inc

@@ -0,0 +1,7 @@
+PROGS+= test_arm_segfault
+PROGS+= test_arm_unaligned
+
+.PATH: ${.CURDIR}/arch/${MACHINE_ARCH}
+
+test_arm_segfault.o : test_arm_segfault.S
+test_arm_unaligned.o : test_arm_unaligned.S

minix/tests/arch/earm/test_arm_segfault.S

@@ -0,0 +1,16 @@
+.text
+.global main
+main:
+	push {lr}
+	ldr r0, =0xDEADBEE0 /* Hopefully this is not mapped... */
+	ldr r1, [r0]
+	ldr r0, =0x01010100 /* In case we survived, try something else */
+	ldr r1, [r0]
+
+	ldr r0, =msg
+	bl puts
+
+	mov r0, #0  /* test should check for non-zero exit code / signal */
+	pop {pc}
+msg:
+	.ascii "ERROR - caused no segfault\n"

minix/tests/arch/earm/test_arm_unaligned.S

@@ -0,0 +1,26 @@
+.text
+.global main
+main:
+	push {lr}
+	mov r0, sp
+
+	/* This should work */
+	ldr r0, [sp]
+
+	/* Unalign it */
+	add r0, #2
+
+	/* Try a non-word aligned word-load, this may work if SCTRL.A == 0 */
+	ldr r1, [r0]
+
+	/* Load non-word aligned dword, should die even with SCTRL.A == 0 */
+	ldrd r2, r3, [r0]
+
+
+	ldr r0, =msg
+	bl puts
+
+	mov r0, #0  /* test should check for non-zero exit code / signal */
+	pop {pc}
+msg:
+	.ascii "ERROR - caused no sigbus\n"