diff --git a/fail.just b/fail.just
index 87e067d..0b96cae 100644
--- a/fail.just
+++ b/fail.just
@@ -9,9 +9,9 @@ trace module:
         -e {{ BUILD_DIR }}-{{ module }}/system.elf \
         -i {{ BUILD_DIR }}-{{ module }}/system.iso \
         -- \
-        -Wf,--start-symbol=start_trace \
-        -Wf,--save-symbol=start_trace \
-        -Wf,--end-symbol=stop_trace \
+        -Wf,--start-symbol=fail_start_trace \
+        -Wf,--save-symbol=fail_start_trace \
+        -Wf,--end-symbol=fail_stop_trace \
         -Wf,--state-file={{ BUILD_DIR }}-{{ module }}/state \
         -Wf,--trace-file={{ BUILD_DIR }}-{{ module }}/trace.pb \
         -Wf,--elf-file={{ BUILD_DIR }}-{{ module }}/system.elf
@@ -62,7 +62,7 @@ import module:
 [group("4: fail")]
 server module:
     {{ FAIL_SERVER }} \
-        --port {{FAIL_SERVER_PORT}} \
+        --port {{ FAIL_SERVER_PORT }} \
         --database-option-file ./db.conf \
         -v {{ module }} \
         -b % \
@@ -87,12 +87,13 @@ client module:
         -i {{ BUILD_DIR }}-{{ module }}/system.iso \
         -j {{ num_cpus() }} \
         -- \
-        -Wf,--server-port={{FAIL_SERVER_PORT}} \
+        -Wf,--server-port={{ FAIL_SERVER_PORT }} \
         -Wf,--state-dir={{ BUILD_DIR }}-{{ module }}/state \
         -Wf,--trap \
         -Wf,--timeout=500000 \
-        -Wf,--ok-marker=ok_marker \
-        -Wf,--fail-marker=fail_marker \
+        -Wf,--ok-marker=fail_marker_positive \
+        -Wf,--fail-marker=fail_marker_negative \
+        -Wf,--detected-marker=fail_marker_detected \
         > /dev/null
     @echo "Next step: \"just result {{ module }}\" or \"just resultbrowser\""
 
@@ -127,4 +128,4 @@ result-csv module:
 [doc("Start the FAIL* resultbrowser")]
 [group("4: fail")]
 resultbrowser:
-    {{ RESULT_BROWSER }} -c ./db.conf --host=0.0.0.0 --port={{RESULTBROWSER_PORT}}
+    {{ RESULT_BROWSER }} -c ./db.conf --host=0.0.0.0 --port={{ RESULTBROWSER_PORT }}
diff --git a/targets/c-host/fail.c b/targets/c-host/fail.c
index f4a1a3b..932df8b 100644
--- a/targets/c-host/fail.c
+++ b/targets/c-host/fail.c
@@ -1,17 +1,23 @@
-#include "lib.h"
+#include "../lib.h"
+
+void fail_start_trace(void) {}
+void fail_stop_trace(void) {}
+void fail_marker_positive(void) {}
+void fail_marker_negative(void) {}
+void fail_marker_detected(void) {}
 
 int wasm_module(void);
 
 MAIN() {
   int result;
 
-  MARKER(start_trace);
+  fail_start_trace();
   result = wasm_module();
-  MARKER(stop_trace);
+  fail_stop_trace();
 
   if (result == 100) {
-    MARKER(ok_marker);
+    fail_marker_positive();
   } else {
-    MARKER(fail_marker);
+    fail_marker_negative();
   }
 }
diff --git a/targets/c-host/lib.h b/targets/lib.h
similarity index 63%
rename from targets/c-host/lib.h
rename to targets/lib.h
index daabf67..0f74c1e 100644
--- a/targets/c-host/lib.h
+++ b/targets/lib.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef _include_fail_h
+#define _include_fail_h
 
 #define INLINE __attribute__((always_inline)) inline
 #define NOINLINE __attribute__((noinline))
@@ -6,25 +7,15 @@
 #define __QUOTE(x) #x
 #define QUOTE(x) __QUOTE(x)
 
-#ifndef ARCH_ASM_CLOBBER_ALL
-#define ARCH_ASM_CLOBBER_ALL "eax", "ebx", "ecx", "edx", "esi", "edi", "ebp"
-#endif
+#define MAIN() void os_main(void)
+#define POSIX_PRINTF(...)
 
-#ifndef MARKER
+#define ARCH_ASM_CLOBBER_ALL "eax", "ebx", "ecx", "edx", "esi", "edi", "ebp"
 #define MARKER(str)                                                            \
   __asm__ volatile(QUOTE(str) ":"                                              \
                    : /* no inputs */                                           \
                    : /* no outputs */                                          \
                    : "memory", ARCH_ASM_CLOBBER_ALL)
-#endif
-
-#ifndef MAIN
-#define MAIN() void os_main(void)
-#endif
-
-#ifndef POSIX_PRINTF
-#define POSIX_PRINTF(...)
-#endif
 
 typedef __UINT8_TYPE__ uint8_t;
 typedef __UINT16_TYPE__ uint16_t;
@@ -33,3 +24,17 @@ typedef __UINT32_TYPE__ uint32_t;
 typedef __INT8_TYPE__ int8_t;
 typedef __INT16_TYPE__ int16_t;
 typedef __INT32_TYPE__ int32_t;
+
+// Mark start of injection
+void __attribute__((noinline)) fail_start_trace(void);
+// Mark end of injection
+void __attribute__((noinline)) fail_stop_trace(void);
+
+// everything ok: valid code and right values
+void __attribute__((noinline)) fail_marker_positive(void);
+// everything ok: valid code but wrong values
+void __attribute__((noinline)) fail_marker_negative(void);
+// invalid code
+void __attribute__((noinline)) fail_marker_detected(void);
+
+#endif
diff --git a/targets/wasm-host/fail.c b/targets/wasm-host/fail.c
index bc6d82c..8c487d0 100644
--- a/targets/wasm-host/fail.c
+++ b/targets/wasm-host/fail.c
@@ -1,10 +1,16 @@
-#include "lib.h"
+#include "../lib.h"
 
 #include "bh_platform.h"
 #include "wasm_export.h"
 
 #include "__WASM_ARRAY_FILE__"
 
+void fail_start_trace(void) {}
+void fail_stop_trace(void) {}
+void fail_marker_positive(void) {}
+void fail_marker_negative(void) {}
+void fail_marker_detected(void) {}
+
 #define STACK_SIZE (4 * 1024)
 #define HEAP_SIZE STACK_SIZE
 #define RUNTIME_POOL_SIZE 4 * STACK_SIZE
@@ -55,19 +61,19 @@ MAIN() {
   uint32_t args[1] = {0};
 
   /* call an arbitrary WASM function */
-  MARKER(start_trace);
+  fail_start_trace();
   if (!wasm_runtime_call_wasm(exec_env, func, 0, args)) {
     /* function wasn't called correctly */
   }
-  MARKER(stop_trace);
-
-  uint32_t result = args[0];
+  fail_stop_trace();
 
   /* the return value is stored in args[0] */
+  uint32_t result = args[0];
+
   if (result == 100) {
-    MARKER(ok_marker);
+    fail_marker_positive();
   } else {
-    MARKER(fail_marker);
+    fail_marker_negative();
   }
 
   wasm_runtime_destroy_exec_env(exec_env);
diff --git a/targets/wasm-host/lib.h b/targets/wasm-host/lib.h
deleted file mode 100644
index daabf67..0000000
--- a/targets/wasm-host/lib.h
+++ /dev/null
@@ -1,35 +0,0 @@
-#pragma once
-
-#define INLINE __attribute__((always_inline)) inline
-#define NOINLINE __attribute__((noinline))
-
-#define __QUOTE(x) #x
-#define QUOTE(x) __QUOTE(x)
-
-#ifndef ARCH_ASM_CLOBBER_ALL
-#define ARCH_ASM_CLOBBER_ALL "eax", "ebx", "ecx", "edx", "esi", "edi", "ebp"
-#endif
-
-#ifndef MARKER
-#define MARKER(str)                                                            \
-  __asm__ volatile(QUOTE(str) ":"                                              \
-                   : /* no inputs */                                           \
-                   : /* no outputs */                                          \
-                   : "memory", ARCH_ASM_CLOBBER_ALL)
-#endif
-
-#ifndef MAIN
-#define MAIN() void os_main(void)
-#endif
-
-#ifndef POSIX_PRINTF
-#define POSIX_PRINTF(...)
-#endif
-
-typedef __UINT8_TYPE__ uint8_t;
-typedef __UINT16_TYPE__ uint16_t;
-typedef __UINT32_TYPE__ uint32_t;
-
-typedef __INT8_TYPE__ int8_t;
-typedef __INT16_TYPE__ int16_t;
-typedef __INT32_TYPE__ int32_t;
diff --git a/wasm.just b/wasm.just
index c882ed1..552de9f 100644
--- a/wasm.just
+++ b/wasm.just
@@ -22,7 +22,6 @@ CROSS_CFLAGS_NOWASM := "\
 -ffunction-sections \
 -fdata-sections \
 -ffreestanding \
--fomit-frame-pointer \
 -ggdb3 \
 "
 CROSS_LDFLAGS_NOWASM := "\
@@ -114,7 +113,7 @@ CROSS_INCLUDES := f"\
 
 # LINUX-POSIX
 
-LINUX_CFLAGS := f"-I./targets/wasm-host {{ LINUX_CFLAGS_NOWASM }}"
+LINUX_CFLAGS := f"-I./targets/wasm-host {{LINUX_CFLAGS_NOWASM}}"
 LINUX_LDFLAGS := f"-Wl,-rpath,{{LIBIWASM_LINUX_DEBUG}} -L{{LIBIWASM_LINUX_DEBUG}} -liwasm {{LINUX_LDFLAGS_NOWASM}}"
 LINUX_INCLUDES := f"\
 -I{{WAMR_ROOT}}/core/iwasm/include \
@@ -216,7 +215,6 @@ build-c-host-linux module:
       -c targets/c-host/linux.c \
       -o {{ BUILD_DIR }}-{{ module }}/c_host.o
 
-
 [doc("Insert the C function into the host program (no WASM)")]
 [group("2: build host")]
 build-c-host module target="fail":