baremetal: exit at the end of main instead of infinite loop

run: interpret lkmc_test_fail as the last line of test as an error

baremetal/arch/aarch64/floating_point.S

@@ -0,0 +1,25 @@
+/* https://github.com/cirosantilli/arm-assembly-cheat/blob/c19e187e98e99f2f4a042783ca238aa4eb2292ab/v8/floating_point.S */
+
+.global main
+main:
+    /* 1.5 + 2.5 == 4.0 */
+    fmov d0, #1.5
+    fmov d1, #2.5
+    fadd d2, d0, d1
+    fmov d3, #4.0
+    fcmp d2, d3
+    beq 1f
+    bl assert_fail
+1:
+
+    /* Now in 32-bit. */
+    fmov s0, #1.5
+    fmov s1, #2.5
+    fadd s2, s0, s1
+    fmov s3, #4.0
+    fcmp s2, s3
+    beq 1f
+    bl assert_fail
+1:
+
+    ret

baremetal/arch/aarch64/return.S

@@ -0,0 +1,4 @@
+/* Return to ensure that the post main works. */
+.global main
+main:
+    ret