diff --git a/tools/fuzz/x86_instruction_emulator/Makefile b/tools/fuzz/x86_instruction_emulator/Makefile
index 0100cfc8ac..1e4c6b37f5 100644
--- a/tools/fuzz/x86_instruction_emulator/Makefile
+++ b/tools/fuzz/x86_instruction_emulator/Makefile
@@ -35,6 +35,8 @@ OBJS := fuzz-emul.o x86-emulate.o
 OBJS += x86_emulate/0f01.o x86_emulate/0fae.o x86_emulate/0fc7.o
 OBJS += x86_emulate/decode.o x86_emulate/fpu.o
 
+WRAPPED = $(shell sed -n 's,^ *WRAP(\([[:alnum:]_]*\));,\1,p' x86-emulate.h)
+
 private.h := x86-emulate.h x86_emulate/x86_emulate.h x86_emulate/private.h
 
 x86-emulate.h: x86_emulate/x86_emulate.h
@@ -51,10 +53,10 @@ x86-insn-fuzzer.a: $(OBJS) cpuid.o
 	$(AR) rc $@ $^
 
 afl-harness: afl-harness.o $(OBJS) cpuid.o wrappers.o
-	$(CC) $(CFLAGS) $^ -o $@
+	$(CC) $(CFLAGS) $(addprefix -Wl$(comma)--wrap=,$(WRAPPED)) $^ -o $@
 
 afl-harness-cov: afl-harness-cov.o $(patsubst %.o,%-cov.o,$(OBJS)) cpuid.o wrappers.o
-	$(CC) $(CFLAGS) $(GCOV_FLAGS) $^ -o $@
+	$(CC) $(CFLAGS) $(GCOV_FLAGS) $(addprefix -Wl$(comma)--wrap=,$(WRAPPED)) $^ -o $@
 
 # Common targets
 .PHONY: all
diff --git a/tools/tests/x86_emulator/Makefile b/tools/tests/x86_emulator/Makefile
index 4079412d2e..affabc0277 100644
--- a/tools/tests/x86_emulator/Makefile
+++ b/tools/tests/x86_emulator/Makefile
@@ -259,8 +259,10 @@ OBJS := x86-emulate.o cpuid.o test_x86_emulator.o evex-disp8.o predicates.o wrap
 OBJS += x86_emulate/0f01.o x86_emulate/0fae.o x86_emulate/0fc7.o
 OBJS += x86_emulate/blk.o x86_emulate/decode.o x86_emulate/fpu.o x86_emulate/util.o
 
+WRAPPED := $(shell sed -n 's,^ *WRAP(\([[:alnum:]_]*\));,\1,p' x86-emulate.h)
+
 $(TARGET): $(OBJS)
-	$(HOSTCC) $(HOSTCFLAGS) -o $@ $^
+	$(HOSTCC) $(HOSTCFLAGS) $(addprefix -Wl$(comma)--wrap=,$(WRAPPED)) -o $@ $^
 
 .PHONY: clean
 clean:
diff --git a/tools/tests/x86_emulator/wrappers.c b/tools/tests/x86_emulator/wrappers.c
index eba7cc93c5..3829a6f416 100644
--- a/tools/tests/x86_emulator/wrappers.c
+++ b/tools/tests/x86_emulator/wrappers.c
@@ -1,78 +1,103 @@
 #include <stdarg.h>
 
-#define WRAP(x) typeof(x) emul_##x
+#define WRAP(x) typeof(x) __wrap_ ## x, __real_ ## x
 #include "x86-emulate.h"
 
-size_t emul_fwrite(const void *src, size_t sz, size_t n, FILE *f)
+size_t __wrap_fwrite(const void *src, size_t sz, size_t n, FILE *f)
 {
     emul_save_fpu_state();
-    sz = fwrite(src, sz, n, f);
+    sz = __real_fwrite(src, sz, n, f);
     emul_restore_fpu_state();
 
     return sz;
 }
 
-int emul_memcmp(const void *p1, const void *p2, size_t sz)
+int __wrap_memcmp(const void *p1, const void *p2, size_t sz)
 {
     int rc;
 
     emul_save_fpu_state();
-    rc = memcmp(p1, p2, sz);
+    rc = __real_memcmp(p1, p2, sz);
     emul_restore_fpu_state();
 
     return rc;
 }
 
-void *emul_memcpy(void *dst, const void *src, size_t sz)
+void *__wrap_memcpy(void *dst, const void *src, size_t sz)
 {
     emul_save_fpu_state();
-    memcpy(dst, src, sz);
+    __real_memcpy(dst, src, sz);
     emul_restore_fpu_state();
 
     return dst;
 }
 
-void *emul_memset(void *dst, int c, size_t sz)
+void *__wrap_memset(void *dst, int c, size_t sz)
 {
     emul_save_fpu_state();
-    memset(dst, c, sz);
+    __real_memset(dst, c, sz);
     emul_restore_fpu_state();
 
     return dst;
 }
 
-int emul_printf(const char *fmt, ...)
+int __wrap_printf(const char *fmt, ...)
 {
     va_list varg;
     int rc;
 
     emul_save_fpu_state();
     va_start(varg, fmt);
-    rc = vprintf(fmt, varg);
+    rc = __real_vprintf(fmt, varg);
     va_end(varg);
     emul_restore_fpu_state();
 
     return rc;
 }
 
-int emul_putchar(int c)
+int __wrap_putchar(int c)
 {
     int rc;
 
     emul_save_fpu_state();
-    rc = putchar(c);
+    rc = __real_putchar(c);
     emul_restore_fpu_state();
 
     return rc;
 }
 
-int emul_puts(const char *str)
+int __wrap_puts(const char *str)
 {
     int rc;
 
     emul_save_fpu_state();
-    rc = puts(str);
+    rc = __real_puts(str);
     emul_restore_fpu_state();
 
     return rc;
 }
+
+int __wrap_snprintf(char *buf, size_t n, const char *fmt, ...)
+{
+    va_list varg;
+    int rc;
+
+    emul_save_fpu_state();
+    va_start(varg, fmt);
+    rc = __real_vsnprintf(buf, n, fmt, varg);
+    va_end(varg);
+    emul_restore_fpu_state();
+
+    return rc;
+}
+
+char *__wrap_strstr(const char *s1, const char *s2)
+{
+    char *s;
+
+    emul_save_fpu_state();
+    s = __real_strstr(s1, s2);
+    emul_restore_fpu_state();
+
+    return s;
+}
diff --git a/tools/tests/x86_emulator/x86-emulate.h b/tools/tests/x86_emulator/x86-emulate.h
index 350d1a0abf..34f0855114 100644
--- a/tools/tests/x86_emulator/x86-emulate.h
+++ b/tools/tests/x86_emulator/x86-emulate.h
@@ -32,9 +32,7 @@
 #ifdef EOF
 # error "Must not include <stdio.h> before x86-emulate.h"
 #endif
-#ifdef WRAP
-# include <stdio.h>
-#endif
+#include <stdio.h>
 
 #include <xen/xen.h>
 
@@ -88,11 +86,7 @@ struct x86_fxsr *get_fpu_save_area(void);
  * around the actual function.
  */
 #ifndef WRAP
-# if 0 /* This only works for explicit calls, not for compiler generated ones. */
-#  define WRAP(x) typeof(x) x asm("emul_" #x)
-# else
-# define WRAP(x) asm(".equ " #x ", emul_" #x)
-# endif
+# define WRAP(x) typeof(x) __wrap_ ## x
 #endif
 
 WRAP(fwrite);
@@ -102,6 +96,10 @@ WRAP(memset);
 WRAP(printf);
 WRAP(putchar);
 WRAP(puts);
+WRAP(snprintf);
+WRAP(strstr);
+WRAP(vprintf);
+WRAP(vsnprintf);
 
 #undef WRAP