i#4474: Port security-common.retexisting test to AArch64 (#6875)

Port security-common.retexisting test to AArch64.

Issue: #4474

suite/tests/CMakeLists.txt

@@ -5888,13 +5888,17 @@ if (NOT RISCV64) # TODO i#3544: Port tests to RISC-V 64
   tochcon(security-common.codemod execmem_exec_t)
   mark_execstack(security-common.codemod)
 endif (NOT RISCV64)
+
+if (X86 OR AARCH64) # FIXME i#1551: port asm to ARM
+  tobuild(security-common.retexisting security-common/retexisting.c)
+endif (X86 OR AARCH64)
+
 if (X86) # FIXME i#1551, i#1569: port asm to ARM and AArch64
   # FIXME i#1308, i#2216: fails non-deterministically on Travis
   set(decode_bad_stack_name security-common.decode-bad-stack_FLAKY)
   tobuild(${decode_bad_stack_name} security-common/decode-bad-stack.c)
   tochcon(${decode_bad_stack_name} execmem_exec_t)
   mark_execstack(${decode_bad_stack_name})
-  tobuild(security-common.retexisting security-common/retexisting.c)
 endif (X86)
 if (PROGRAM_SHEPHERDING) # relies on being aborted on .B violation
   tobuild(security-common.jmp_from_trace security-common/jmp_from_trace.c)

suite/tests/security-common/retexisting.c

@@ -103,14 +103,15 @@ START_FILE
 DECL_EXTERN(precious)
 
 /* ring() returns to this code, at which point we have exactly 16-byte
- * alignment.  However, the ABI expects there to be a retaddr on the stack and
- * the stack to be 16-byte alinged minus 8.  We use this trampoline to push a
- * fake retaddr to match the ABI.
+ * alignment. On X86 the ABI expects there to be a retaddr on the stack and
+ * the stack to be 16-byte aligned minus 8. Push a fake retaddr to match the ABI.
  */
     DECLARE_FUNC(precious_push_fake_retaddr)
 GLOBAL_LABEL(precious_push_fake_retaddr:)
-        push     0          /* Fake retaddr, will crash if it returns. */
-        jmp      GLOBAL_REF(precious)    /* no return */
+#    ifdef X86
+        push 0 /* Fake retaddr, will crash if it returns. */
+#    endif
+        JUMP GLOBAL_REF(precious)  /* no return. */
         END_FUNC(precious_push_fake_retaddr)
 
 END_FILE