diff --git a/sim/Makefile.in b/sim/Makefile.in
index ec24aa196acf..7fa32b805faa 100644
--- a/sim/Makefile.in
+++ b/sim/Makefile.in
@@ -2472,17 +2472,6 @@ testsuite_common_CPPFLAGS = \
 # opc2c leaks memory, and therefore makes AddressSanitizer unhappy.  Disable
 # leak detection while running it.
 @SIM_ENABLE_ARCH_m32c_TRUE@m32c_OPC2C_RUN = ASAN_OPTIONS=detect_leaks=0 m32c/opc2c$(EXEEXT)
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_cpu.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_cpu2.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_cpux.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_m32r.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_m32r2.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_m32rx.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_mloop.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_mloop2.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_mloopx.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_sem.o = -Wno-error
-@SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_sim_if.o = -Wno-error
 @SIM_ENABLE_ARCH_m32r_TRUE@AM_CFLAGS_m32r_traps.o = -Wno-error
 @SIM_ENABLE_ARCH_m32r_TRUE@nodist_m32r_libsim_a_SOURCES = \
 @SIM_ENABLE_ARCH_m32r_TRUE@	m32r/modules.c
diff --git a/sim/m32r/local.mk b/sim/m32r/local.mk
index db5456753210..182d8879b434 100644
--- a/sim/m32r/local.mk
+++ b/sim/m32r/local.mk
@@ -17,17 +17,6 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 ## Some modules don't build cleanly yet.
-AM_CFLAGS_%C%_cpu.o = -Wno-error
-AM_CFLAGS_%C%_cpu2.o = -Wno-error
-AM_CFLAGS_%C%_cpux.o = -Wno-error
-AM_CFLAGS_%C%_m32r.o = -Wno-error
-AM_CFLAGS_%C%_m32r2.o = -Wno-error
-AM_CFLAGS_%C%_m32rx.o = -Wno-error
-AM_CFLAGS_%C%_mloop.o = -Wno-error
-AM_CFLAGS_%C%_mloop2.o = -Wno-error
-AM_CFLAGS_%C%_mloopx.o = -Wno-error
-AM_CFLAGS_%C%_sem.o = -Wno-error
-AM_CFLAGS_%C%_sim_if.o = -Wno-error
 AM_CFLAGS_%C%_traps.o = -Wno-error
 
 nodist_%C%_libsim_a_SOURCES = \
diff --git a/sim/m32r/m32r-sim.h b/sim/m32r/m32r-sim.h
index 0e1bf82ace54..c72be52e18ae 100644
--- a/sim/m32r/m32r-sim.h
+++ b/sim/m32r/m32r-sim.h
@@ -39,24 +39,42 @@
 
 extern int m32r_decode_gdb_ctrl_regnum (int);
 
+/* The other cpu cores reuse m32rbf funcs to avoid duplication, but they don't
+   provide externs to access, and we can't e.g. include decode.h in decodex.h
+   because of all the redefinitions of cgen macros.  */
+
+extern void m32rbf_model_insn_before (SIM_CPU *, int);
+extern void m32rbf_model_insn_after (SIM_CPU *, int, int);
+extern CPUREG_FETCH_FN m32rbf_fetch_register;
+extern CPUREG_STORE_FN m32rbf_store_register;
+extern void m32rbf_h_cr_set (SIM_CPU *, UINT, USI);
+
 /* Cover macros for hardware accesses.
    FIXME: Eventually move to cgen.  */
 #define GET_H_SM() ((CPU (h_psw) & 0x80) != 0)
 
-#ifndef GET_H_CR
 extern USI  m32rbf_h_cr_get_handler (SIM_CPU *, UINT);
 extern void m32rbf_h_cr_set_handler (SIM_CPU *, UINT, USI);
+extern USI  m32r2f_h_cr_get_handler (SIM_CPU *, UINT);
+extern void m32r2f_h_cr_set_handler (SIM_CPU *, UINT, USI);
+extern USI  m32rxf_h_cr_get_handler (SIM_CPU *, UINT);
+extern void m32rxf_h_cr_set_handler (SIM_CPU *, UINT, USI);
 
+#ifndef GET_H_CR
 #define GET_H_CR(regno) \
   XCONCAT2 (WANT_CPU,_h_cr_get_handler) (current_cpu, (regno))
 #define SET_H_CR(regno, val) \
   XCONCAT2 (WANT_CPU,_h_cr_set_handler) (current_cpu, (regno), (val))
 #endif
 
-#ifndef  GET_H_PSW
 extern UQI  m32rbf_h_psw_get_handler (SIM_CPU *);
 extern void m32rbf_h_psw_set_handler (SIM_CPU *, UQI);
+extern UQI  m32r2f_h_psw_get_handler (SIM_CPU *);
+extern void m32r2f_h_psw_set_handler (SIM_CPU *, UQI);
+extern UQI  m32rxf_h_psw_get_handler (SIM_CPU *);
+extern void m32rxf_h_psw_set_handler (SIM_CPU *, UQI);
 
+#ifndef  GET_H_PSW
 #define GET_H_PSW() \
   XCONCAT2 (WANT_CPU,_h_psw_get_handler) (current_cpu)
 #define SET_H_PSW(val) \
@@ -72,8 +90,15 @@ extern void m32rbf_h_psw_set_handler (SIM_CPU *, UQI);
    prototypes for each of the functions it generates.  */
 extern DI   m32rbf_h_accum_get_handler (SIM_CPU *);
 extern void m32rbf_h_accum_set_handler (SIM_CPU *, DI);
+extern DI   m32r2f_h_accum_get_handler (SIM_CPU *);
+extern void m32r2f_h_accum_set_handler (SIM_CPU *, DI);
+extern DI   m32rxf_h_accum_get_handler (SIM_CPU *);
+extern void m32rxf_h_accum_set_handler (SIM_CPU *, DI);
+
 extern DI   m32r2f_h_accums_get_handler (SIM_CPU *, UINT);
 extern void m32r2f_h_accums_set_handler (SIM_CPU *, UINT, DI);
+extern DI   m32rxf_h_accums_get_handler (SIM_CPU *, UINT);
+extern void m32rxf_h_accums_set_handler (SIM_CPU *, UINT, DI);
 
 #ifndef  GET_H_ACCUM
 #define GET_H_ACCUM() \
