more filechecks?

riscemu/__main__.py

@@ -129,6 +129,13 @@ unlimited_regs:       Allow an unlimited number of registers""",
         action="store_true",
     )
 
+    parser.add_argument(
+        "--ignore-exit-code",
+        help="Ignore exit code of the program and always return 0 if the program ran to completion.",
+        action="store_true",
+        default=False
+    )
+
     args = parser.parse_args()
 
     # create a RunConfig from the cli args
@@ -170,7 +177,7 @@ unlimited_regs:       Allow an unlimited number of registers""",
 
         # launch the last loaded program
         cpu.launch(cpu.mmu.programs[-1], verbose=cfg.verbosity > 1)
-        sys.exit(cpu.exit_code)
+        sys.exit(cpu.exit_code if not args.ignore_exit_code else 0)
 
     except RiscemuBaseException as e:
         print("Error: {}".format(e.message()))

test/filecheck/.lit_test_times.txt

@@ -1 +1,2 @@
-8.836818e-02 hello-world.asm
+8.096814e-02 hello-world.asm
+9.465098e-02 fibs.asm

test/filecheck/fibs.asm

@@ -0,0 +1,23 @@
+// RUN: python3 -m riscemu -v --ignore-exit-code %s || true | filecheck %s
+.data
+fibs:   .space 1024
+
+        .text
+main:
+        addi    s1, zero, 0     // storage index
+        addi    s2, zero, 1024  // last storage index
+        addi    t0, zero, 1     // t0 = F_{i}
+        addi    t1, zero, 1     // t1 = F_{i+1}
+loop:
+        sw      t0, fibs(s1)    // save
+        add     t2, t1, t0      // t2 = F_{i+2}
+        addi    t0, t1, 0       // t0 = t1
+        addi    t1, t2, 0       // t1 = t2
+        addi    s1, s1, 4       // increment storage pointer
+        blt     s1, s2, loop    // loop as long as we did not reach array length
+        // exit gracefully
+        add     a0, zero, t2
+        addi    a7, zero, 93
+        scall                   // exit with code 0
+
+// CHECK: [CPU] Program exited with code 1265227608