diff --git a/include/osmocom/gsm/protocol/gsm_03_41.h b/include/osmocom/gsm/protocol/gsm_03_41.h
index 2e0ad69..1b399ae 100644
--- a/include/osmocom/gsm/protocol/gsm_03_41.h
+++ b/include/osmocom/gsm/protocol/gsm_03_41.h
@@ -19,35 +19,34 @@
 /* Chapter 9.3.2 */
 struct gsm341_ms_message {
 	struct {
-#if OSMO_IS_LITTLE_ENDIAN == 1
+#if OSMO_IS_LITTLE_ENDIAN
 		uint8_t code_hi:6;
 		uint8_t gs:2;
 		uint8_t update:4;
 		uint8_t code_lo:4;
-#else
-		uint8_t gs:2;
-		uint8_t code_hi:6;
-		uint8_t code_lo:4;
-		uint8_t update:4;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+		uint8_t gs:2, code_hi:6;
+		uint8_t code_lo:4, update:4;
 #endif
 	} serial;
 	uint16_t msg_id;
 	struct {
-#if OSMO_IS_LITTLE_ENDIAN == 1
+#if OSMO_IS_LITTLE_ENDIAN
 		uint8_t language:4;
 		uint8_t group:4;
-#else
-		uint8_t group:4;
-		uint8_t language:4;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+		uint8_t group:4, language:4;
 #endif
 	} dcs;
 	struct {
-#if OSMO_IS_LITTLE_ENDIAN == 1
+#if OSMO_IS_LITTLE_ENDIAN
 		uint8_t total:4;
 		uint8_t current:4;
-#else
-		uint8_t current:4;
-		uint8_t total:4;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+		uint8_t current:4, total:4;
 #endif
 	} page;
 	uint8_t data[0];
@@ -56,20 +55,17 @@
 /* Chapter 9.4.1.3 */
 struct gsm341_etws_message {
 	struct {
-#if OSMO_IS_LITTLE_ENDIAN == 1
+#if OSMO_IS_LITTLE_ENDIAN
 		uint8_t code_hi:4;
 		uint8_t popup:1;
 		uint8_t alert:1;
 		uint8_t gs:2;
 		uint8_t update:4;
 		uint8_t code_lo:4;
-#else
-		uint8_t gs:2;
-		uint8_t alert:1;
-		uint8_t popup:1;
-		uint8_t code_hi:4;
-		uint8_t code_lo:4;
-		uint8_t update:4;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+		uint8_t gs:2, alert:1, popup:1, code_hi:4;
+		uint8_t code_lo:4, update:4;
 #endif
 	} serial;
 	uint16_t msg_id;
diff --git a/include/osmocom/gsm/protocol/gsm_04_08.h b/include/osmocom/gsm/protocol/gsm_04_08.h
index e218295..a97225c 100644
--- a/include/osmocom/gsm/protocol/gsm_04_08.h
+++ b/include/osmocom/gsm/protocol/gsm_04_08.h
@@ -13,15 +13,21 @@
 
 /* Chapter 10.5.1.5 */
 struct gsm48_classmark1 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t pwr_lev:3,
 		 a5_1:1,
 		 es_ind:1,
 		 rev_lev:2,
 		 spare:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t spare:1, rev_lev:2, es_ind:1, a5_1:1, pwr_lev:3;
+#endif
 } __attribute__ ((packed));
 
 /* Chapter 10.5.1.6 */
 struct gsm48_classmark2 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t pwr_lev:3,
 		 a5_1:1,
 		 es_ind:1,
@@ -42,11 +48,18 @@
 		 lcsva_cap:1,
 		 spare4:1,
 		 cm3:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t spare:1, rev_lev:2, es_ind:1, a5_1:1, pwr_lev:3;
+	uint8_t	spare2:1, ps_cap:1, ss_scr:2, sm_cap:1, vbs:1, vgcs:1, fc:1;
+	uint8_t	cm3:1, spare4:1, lcsva_cap:1, spare3:1, solsa:1, cmsp:1, a5_3:1, a5_2:1;
+#endif
 } __attribute__ ((packed));
 
 /* Chapter 10.5.2.1b.3 */
 #if OSMO_IS_LITTLE_ENDIAN == 1
 struct gsm48_range_1024 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	w1_hi:2,
 		 f0:1,
 		 form_id:5;
@@ -78,9 +91,29 @@
 		 w14_lo:3;
 	uint8_t	w16:6,
 		 w15_lo:2;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	form_id:5, f0:1, w1_hi:2;
+	uint8_t	w1_lo;
+	uint8_t	w2_hi;
+	uint8_t	w2_lo:1, w3_hi:7;
+	uint8_t	w3_lo:2, w4_hi:6;
+	uint8_t	w4_lo:2, w5_hi:6;
+	uint8_t	w5_lo:2, w6_hi:6;
+	uint8_t	w6_lo:2, w7_hi:6;
+	uint8_t	w7_lo:2, w8_hi:6;
+	uint8_t	w8_lo:1, w9:7;
+	uint8_t	w10:7, w11_hi:1;
+	uint8_t	w11_lo:6, w12_hi:2;
+	uint8_t	w12_lo:5, w13_hi:3;
+	uint8_t	w13_lo:4, w14_hi:4;
+	uint8_t	w14_lo:3, w15_hi:5;
+	uint8_t	w15_lo:2, w16:6;
+#endif
 } __attribute__ ((packed));
 #else
 struct gsm48_range_1024 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	 form_id:5,
 		f0:1,
 		w1_hi:2;
@@ -112,12 +145,32 @@
 		w15_hi:5;
 	uint8_t	 w15_lo:2,
 		w16:6;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	 w1_hi:2, f0:1, form_id:5;
+	uint8_t	w1_lo;
+	uint8_t	w2_hi;
+	uint8_t	 w3_hi:7, w2_lo:1;
+	uint8_t	 w4_hi:6, w3_lo:2;
+	uint8_t	 w5_hi:6, w4_lo:2;
+	uint8_t	 w6_hi:6, w5_lo:2;
+	uint8_t	 w7_hi:6, w6_lo:2;
+	uint8_t	 w8_hi:6, w7_lo:2;
+	uint8_t	 w9:7, w8_lo:1;
+	uint8_t	 w11_hi:1, w10:7;
+	uint8_t	 w12_hi:2, w11_lo:6;
+	uint8_t	 w13_hi:3, w12_lo:5;
+	uint8_t	 w14_hi:4, w13_lo:4;
+	uint8_t	 w15_hi:5, w14_lo:3;
+	uint8_t	 w16:6, w15_lo:2;
+#endif
 } __attribute__ ((packed));
 #endif
 
 /* Chapter 10.5.2.1b.4 */
 #if OSMO_IS_LITTLE_ENDIAN == 1
 struct gsm48_range_512 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	orig_arfcn_hi:1,
 		 form_id:7;
 	uint8_t	orig_arfcn_mid;
@@ -149,9 +202,29 @@
 		 w15:6;
 	uint8_t	w17:5,
 		 w16_lo:3;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	form_id:7, orig_arfcn_hi:1;
+	uint8_t	orig_arfcn_mid;
+	uint8_t	orig_arfcn_lo:1, w1_hi:7;
+	uint8_t	w1_lo:2, w2_hi:6;
+	uint8_t	w2_lo:2, w3_hi:6;
+	uint8_t	w3_lo:2, w4_hi:6;
+	uint8_t	w4_lo:1, w5:7;
+	uint8_t	w6:7, w7_hi:1;
+	uint8_t	w7_lo:6, w8_hi:2;
+	uint8_t	w8_lo:4, w9_hi:4;
+	uint8_t	w9_lo:2, w10:6;
+	uint8_t	w11:6, w12_hi:2;
+	uint8_t	w12_lo:4, w13_hi:4;
+	uint8_t	w13_lo:2, w14:6;
+	uint8_t	w15:6, w16_hi:2;
+	uint8_t	w16_lo:3, w17:5;
+#endif
 } __attribute__ ((packed));
 #else
 struct gsm48_range_512 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	 form_id:7,
 		orig_arfcn_hi:1;
 	uint8_t	orig_arfcn_mid;
@@ -183,12 +256,32 @@
 		w16_hi:2;
 	uint8_t	 w16_lo:3,
 		w17:5;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	 orig_arfcn_hi:1, form_id:7;
+	uint8_t	orig_arfcn_mid;
+	uint8_t	 w1_hi:7, orig_arfcn_lo:1;
+	uint8_t	 w2_hi:6, w1_lo:2;
+	uint8_t	 w3_hi:6, w2_lo:2;
+	uint8_t	 w4_hi:6, w3_lo:2;
+	uint8_t	 w5:7, w4_lo:1;
+	uint8_t	 w7_hi:1, w6:7;
+	uint8_t	 w8_hi:2, w7_lo:6;
+	uint8_t	 w9_hi:4, w8_lo:4;
+	uint8_t	 w10:6, w9_lo:2;
+	uint8_t	 w12_hi:2, w11:6;
+	uint8_t	 w13_hi:4, w12_lo:4;
+	uint8_t	 w14:6, w13_lo:2;
+	uint8_t	 w16_hi:2, w15:6;
+	uint8_t	 w17:5, w16_lo:3;
+#endif
 } __attribute__ ((packed));
 #endif
 
 /* Chapter 10.5.2.1b.5 */
 #if OSMO_IS_LITTLE_ENDIAN == 1
 struct gsm48_range_256 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	orig_arfcn_hi:1,
 		 form_id:7;
 	uint8_t	orig_arfcn_mid;
@@ -226,9 +319,29 @@
 	uint8_t	spare:1,
 		 w21:4,
 		 w20_lo:3;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	form_id:7, orig_arfcn_hi:1;
+	uint8_t	orig_arfcn_mid;
+	uint8_t	orig_arfcn_lo:1, w1_hi:7;
+	uint8_t	w1_lo:1, w2:7;
+	uint8_t	w3:7, w4_hi:1;
+	uint8_t	w4_lo:5, w5_hi:3;
+	uint8_t	w5_lo:3, w6_hi:5;
+	uint8_t	w6_lo:1, w7:6, w8_hi:1;
+	uint8_t	w8_lo:4, w9_hi:4;
+	uint8_t	w9_lo:1, w10:5, w11_hi:2;
+	uint8_t	w11_lo:3, w12:5;
+	uint8_t	w13:5, w14_hi:3;
+	uint8_t	w14_lo:2, w15:5, w16_hi:1;
+	uint8_t	w16_lo:3, w17:4, w18_hi:1;
+	uint8_t	w18_lo:3, w19:4, w20_hi:1;
+	uint8_t	w20_lo:3, w21:4, spare:1;
+#endif
 } __attribute__ ((packed));
 #else
 struct gsm48_range_256 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	 form_id:7,
 		orig_arfcn_hi:1;
 	uint8_t	orig_arfcn_mid;
@@ -266,12 +379,32 @@
 	uint8_t	 w20_lo:3,
 		 w21:4,
 		spare:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	 orig_arfcn_hi:1, form_id:7;
+	uint8_t	orig_arfcn_mid;
+	uint8_t	 w1_hi:7, orig_arfcn_lo:1;
+	uint8_t	 w2:7, w1_lo:1;
+	uint8_t	 w4_hi:1, w3:7;
+	uint8_t	 w5_hi:3, w4_lo:5;
+	uint8_t	 w6_hi:5, w5_lo:3;
+	uint8_t	 w8_hi:1, w7:6, w6_lo:1;
+	uint8_t	 w9_hi:4, w8_lo:4;
+	uint8_t	 w11_hi:2, w10:5, w9_lo:1;
+	uint8_t	 w12:5, w11_lo:3;
+	uint8_t	 w14_hi:3, w13:5;
+	uint8_t	 w16_hi:1, w15:5, w14_lo:2;
+	uint8_t	 w18_hi:1, w17:4, w16_lo:3;
+	uint8_t	 w20_hi:1, w19:4, w18_lo:3;
+	uint8_t	 spare:1, w21:4, w20_lo:3;
+#endif
 } __attribute__ ((packed));
 #endif
 
 /* Chapter 10.5.2.1b.6 */
 #if OSMO_IS_LITTLE_ENDIAN == 1
 struct gsm48_range_128 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	orig_arfcn_hi:1,
 		 form_id:7;
 	uint8_t	orig_arfcn_mid;
@@ -311,9 +444,29 @@
 		 w28:3,
 		 w27:3,
 		 w26_lo:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	form_id:7, orig_arfcn_hi:1;
+	uint8_t	orig_arfcn_mid;
+	uint8_t	orig_arfcn_lo:1, w1:7;
+	uint8_t	w2:6, w3_hi:2;
+	uint8_t	w3_lo:4, w4_hi:4;
+	uint8_t	w4_lo:1, w5:5, w6_hi:2;
+	uint8_t	w6_lo:3, w7:5;
+	uint8_t	w8:4, w9:4;
+	uint8_t	w10:4, w11:4;
+	uint8_t	w12:4, w13:4;
+	uint8_t	w14:4, w15:4;
+	uint8_t	w16:3, w17:3, w18_hi:2;
+	uint8_t	w18_lo:1, w19:3, w20:3, w21_hi:1;
+	uint8_t	w21_lo:2, w22:3, w23:3;
+	uint8_t	w24:3, w25:3, w26_hi:2;
+	uint8_t	w26_lo:1, w27:3, w28:3, spare:1;
+#endif
 } __attribute__ ((packed));
 #else
 struct gsm48_range_128 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	 form_id:7,
 		orig_arfcn_hi:1;
 	uint8_t	orig_arfcn_mid;
@@ -353,17 +506,44 @@
 		 w27:3,
 		 w28:3,
 		spare:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	 orig_arfcn_hi:1, form_id:7;
+	uint8_t	orig_arfcn_mid;
+	uint8_t	 w1:7, orig_arfcn_lo:1;
+	uint8_t	 w3_hi:2, w2:6;
+	uint8_t	 w4_hi:4, w3_lo:4;
+	uint8_t	 w6_hi:2, w5:5, w4_lo:1;
+	uint8_t	 w7:5, w6_lo:3;
+	uint8_t	 w9:4, w8:4;
+	uint8_t	 w11:4, w10:4;
+	uint8_t	 w13:4, w12:4;
+	uint8_t	 w15:4, w14:4;
+	uint8_t	 w18_hi:2, w17:3, w16:3;
+	uint8_t	 w21_hi:1, w20:3, w19:3, w18_lo:1;
+	uint8_t	 w23:3, w22:3, w21_lo:2;
+	uint8_t	 w26_hi:2, w25:3, w24:3;
+	uint8_t	 spare:1, w28:3, w27:3, w26_lo:1;
+#endif
 } __attribute__ ((packed));
 #endif
 
 /* Chapter 10.5.2.1b.7 */
 struct gsm48_var_bit {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	orig_arfcn_hi:1,
 		 form_id:7;
 	uint8_t	orig_arfcn_mid;
 	uint8_t	rrfcn1_7:7,
 		 orig_arfcn_lo:1;
 	uint8_t rrfcn8_111[13];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	form_id:7, orig_arfcn_hi:1;
+	uint8_t	orig_arfcn_mid;
+	uint8_t	orig_arfcn_lo:1, rrfcn1_7:7;
+	uint8_t rrfcn8_111[13];
+#endif
 } __attribute__ ((packed));
 
 /* Chapter 10.5.2.5 */
@@ -371,24 +551,37 @@
 	uint8_t chan_nr;
 	union {
 		struct {
+#if OSMO_IS_LITTLE_ENDIAN
 			uint8_t maio_high:4,
 				 h:1,
 				 tsc:3;
 			uint8_t hsn:6,
 				 maio_low:2;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+			uint8_t tsc:3, h:1, maio_high:4;
+			uint8_t maio_low:2, hsn:6;
+#endif
 		} __attribute__ ((packed)) h1;
 		struct {
+#if OSMO_IS_LITTLE_ENDIAN
 			uint8_t arfcn_high:2,
 				 spare:2,
 				 h:1,
 				 tsc:3;
 			uint8_t arfcn_low;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+			uint8_t tsc:3, h:1, spare:2, arfcn_high:2;
+			uint8_t arfcn_low;
+#endif
 		} __attribute__ ((packed)) h0;
 	} __attribute__ ((packed));
 } __attribute__ ((packed));
 
 /* Chapter 10.5.2.20 */
 struct gsm48_meas_res {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	rxlev_full:6,
 		 dtx_used:1,
 		 ba_used:1;
@@ -428,10 +621,30 @@
 		 rxlev_nc6_lo:5;
 	uint8_t	bsic_nc6:6,
 		 bcch_f_nc6_lo:2;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	ba_used:1, dtx_used:1, rxlev_full:6;
+	uint8_t	spare:1, meas_valid:1, rxlev_sub:6;
+	uint8_t	spare2:1, rxqual_full:3, rxqual_sub:3, no_nc_n_hi:1;
+	uint8_t	no_nc_n_lo:2, rxlev_nc1:6;
+	uint8_t	bcch_f_nc1:5, bsic_nc1_hi:3;
+	uint8_t	bsic_nc1_lo:3, rxlev_nc2_hi:5;
+	uint8_t	rxlev_nc2_lo:1, bcch_f_nc2:5, bsic_nc2_hi:2;
+	uint8_t	bsic_nc2_lo:4, rxlev_nc3_hi:4;
+	uint8_t	rxlev_nc3_lo:2, bcch_f_nc3:5, bsic_nc3_hi:1;
+	uint8_t	bsic_nc3_lo:5, rxlev_nc4_hi:3;
+	uint8_t	rxlev_nc4_lo:3, bcch_f_nc4:5;
+	uint8_t	bsic_nc4:6, rxlev_nc5_hi:2;
+	uint8_t	rxlev_nc5_lo:4, bcch_f_nc5_hi:4;
+	uint8_t	bcch_f_nc5_lo:1, bsic_nc5:6, rxlev_nc6_hi:1;
+	uint8_t	rxlev_nc6_lo:5, bcch_f_nc6_hi:3;
+	uint8_t	bcch_f_nc6_lo:2, bsic_nc6:6;
+#endif
 } __attribute__ ((packed));
 
 /* Chapter 10.5.2.21aa */
 struct gsm48_multi_rate_conf {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t smod : 2,
 		 spare: 1,
 		 icmi : 1,
@@ -445,23 +658,40 @@
 		 m7_95 : 1,
 		 m10_2 : 1,
 		 m12_2 : 1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t ver:3, nscb:1, icmi:1, spare:1, smod:2;
+	uint8_t m12_2:1, m10_2:1, m7_95:1, m7_40:1, m6_70:1, m5_90:1, m5_15:1, m4_75:1;
+#endif
 } __attribute__((packed));
 
 /* Chapter 10.5.2.28(a) */
 struct gsm48_power_cmd {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t power_level:5,
 		 spare:2,
 		 atc:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t atc:1, spare:2, power_level:5;
+#endif
 } __attribute__((packed));
 
 /* Chapter 10.5.2.29 */
 struct gsm48_rach_control {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t re :1,
 		 cell_bar :1,
 		 tx_integer :4,
 		 max_trans :2;
 	uint8_t t2; /* ACC 8-15 barred flags */
 	uint8_t t3; /* ACC 0-7 barred flags */
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t max_trans:2, tx_integer:4, cell_bar:1, re:1;
+	uint8_t t2;
+	uint8_t t3;
+#endif
 } __attribute__ ((packed));
 
 /*
@@ -508,27 +738,45 @@
 
 /* Chapter 10.5.2.30 */
 struct gsm48_req_ref {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t ra;
 	uint8_t t3_high:3,
 		 t1:5;
 	uint8_t t2:5,
 		 t3_low:3;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t ra;
+	uint8_t t1:5, t3_high:3;
+	uint8_t t3_low:3, t2:5;
+#endif
 } __attribute__ ((packed));
 
 /* Chapter 10.5.2.38 */
 struct gsm48_start_time {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t t3_high:3,
 		 t1:5;
 	uint8_t t2:5,
 		 t3_low:3;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t t1:5, t3_high:3;
+	uint8_t t3_low:3, t2:5;
+#endif
 } __attribute__ ((packed));
 
 /* Chapter 10.5.2.39 */
 struct gsm48_sync_ind {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t si:2,
 		 rot:1,
 		 nci:1,
 		 sync_ie:4;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t sync_ie:4, nci:1, rot:1, si:2;
+#endif
 } __attribute__((packed));
 
 /*
@@ -582,10 +830,16 @@
 
 /* Chapter 10.5.2.2 */
 struct gsm48_cell_desc {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t bcc:3,
 		 ncc:3,
 		 arfcn_hi:2;
 	uint8_t arfcn_lo;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t arfcn_hi:2, ncc:3, bcc:3;
+	uint8_t arfcn_lo;
+#endif
 } __attribute__((packed));
 
 /* Chapter 9.1.15 */
@@ -612,11 +866,19 @@
 
 /* Chapter 9.1.25 */
 struct gsm48_pag_resp {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t spare:4,
 		 key_seq:4;
 	uint32_t classmark2;
 	uint8_t mi_len;
 	uint8_t mi[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t key_seq:4, spare:4;
+	uint32_t classmark2;
+	uint8_t mi_len;
+	uint8_t mi[0];
+#endif
 } __attribute__ ((packed));
 
 /* Chapter 10.5.1.3 */
@@ -627,9 +889,15 @@
 
 /* Section 9.2.2 */
 struct gsm48_auth_req {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t key_seq:4,
 	         spare:4;
 	uint8_t rand[16];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t spare:4, key_seq:4;
+	uint8_t rand[16];
+#endif
 } __attribute__ ((packed));
 
 /* Section 9.2.3 */
@@ -639,12 +907,21 @@
 
 /* Section 9.2.15 */
 struct gsm48_loc_upd_req {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t type:4,
 		 key_seq:4;
 	struct gsm48_loc_area_id lai;
 	struct gsm48_classmark1 classmark1;
 	uint8_t mi_len;
 	uint8_t mi[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t key_seq:4, type:4;
+	struct gsm48_loc_area_id lai;
+	struct gsm48_classmark1 classmark1;
+	uint8_t mi_len;
+	uint8_t mi[0];
+#endif
 } __attribute__ ((packed));
 
 /* Section 10.1 */
@@ -656,23 +933,37 @@
 
 /* Section 9.1.3x System information Type header */
 struct gsm48_system_information_type_header {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t l2_plen;
 	uint8_t rr_protocol_discriminator :4,
 		skip_indicator:4; 
 	uint8_t system_information;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t l2_plen;
+	uint8_t skip_indicator:4, rr_protocol_discriminator:4;
+	uint8_t system_information;
+#endif
 } __attribute__ ((packed));
 
 /* Section 10.5.2.4 Cell Selection Parameters */
 struct gsm48_cell_sel_par {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t ms_txpwr_max_ccch:5,	/* GSM 05.08 MS-TXPWR-MAX-CCCH */
 		 cell_resel_hyst:3;	/* GSM 05.08 CELL-RESELECT-HYSTERESIS */
 	uint8_t rxlev_acc_min:6,	/* GSM 05.08 RXLEV-ACCESS-MIN */
 		 neci:1,
 		 acs:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t cell_resel_hyst:3, ms_txpwr_max_ccch:5;
+	uint8_t acs:1, neci:1, rxlev_acc_min:6;
+#endif
 } __attribute__ ((packed));
 
 /* 3GPP TS 44.018 Section 10.5.2.11 Control Channel Description */
 struct gsm48_control_channel_descr {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t ccch_conf :3,
 		bs_ag_blks_res :3,
 		att :1,
@@ -682,6 +973,12 @@
 		cbq3 :2,
 		spare_2 :1;
 	uint8_t t3212;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t mscr:1, att:1, bs_ag_blks_res:3, ccch_conf:3;
+	uint8_t spare_2:1, cbq3:2, spare_1:2, bs_pa_mfrms:3;
+	uint8_t t3212;
+#endif
 } __attribute__ ((packed));
 
 enum gsm48_dtx_mode {
@@ -693,15 +990,21 @@
 /* Cell Options for SI6, SACCH (10.5.2.3a.2) or SI3, BCCH (Table 10.5.2.3.1),
    3GPP TS 44.018 */
 struct gsm48_cell_options {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t radio_link_timeout:4,
 		 dtx:2,
 		 pwrc:1,
 	/* either DN-IND or top bit of DTX IND */
 		 d:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t d:1, pwrc:1, dtx:2, radio_link_timeout:4;
+#endif
 } __attribute__ ((packed));
 
 /* Section 9.2.9 CM service request */
 struct gsm48_service_request {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t cm_service_type : 4,
 		 cipher_key_seq  : 4;
 	/* length + 3 bytes */
@@ -709,6 +1012,13 @@
 	uint8_t mi_len;
 	uint8_t mi[0];
 	/* optional priority level */
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t cipher_key_seq:4, cm_service_type:4;
+	uint32_t classmark;
+	uint8_t mi_len;
+	uint8_t mi[0];
+#endif
 } __attribute__ ((packed));
 
 /* Section 9.1.31 System information Type 1 */
@@ -774,30 +1084,52 @@
 
 /* Section 9.1.37 System information Type 5 */
 struct gsm48_system_information_type_5 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t rr_protocol_discriminator :4,
 		skip_indicator:4; 
 	uint8_t system_information;
 	uint8_t bcch_frequency_list[16];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t skip_indicator:4, rr_protocol_discriminator:4;
+	uint8_t system_information;
+	uint8_t bcch_frequency_list[16];
+#endif
 } __attribute__ ((packed));
 
 /* Section 9.1.38 System information Type 5bis */
 struct gsm48_system_information_type_5bis {
+#if OSMO_IS_LITTLE_ENDIAN
         uint8_t rr_protocol_discriminator :4,
 		 skip_indicator:4;
 	uint8_t system_information;
 	uint8_t bcch_frequency_list[16];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+        uint8_t skip_indicator:4, rr_protocol_discriminator:4;
+	uint8_t system_information;
+	uint8_t bcch_frequency_list[16];
+#endif
 } __attribute__ ((packed));
 
 /* Section 9.1.39 System information Type 5ter */
 struct gsm48_system_information_type_5ter {
+#if OSMO_IS_LITTLE_ENDIAN
         uint8_t rr_protocol_discriminator :4,
 		 skip_indicator:4;
 	uint8_t system_information;
 	uint8_t bcch_frequency_list[16];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+        uint8_t skip_indicator:4, rr_protocol_discriminator:4;
+	uint8_t system_information;
+	uint8_t bcch_frequency_list[16];
+#endif
 } __attribute__ ((packed));
 
 /* Section 9.1.40 System information Type 6 */
 struct gsm48_system_information_type_6 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t rr_protocol_discriminator :4,
 		skip_indicator:4; 
 	uint8_t system_information;
@@ -806,6 +1138,16 @@
 	struct gsm48_cell_options cell_options;
 	uint8_t ncc_permitted;
 	uint8_t rest_octets[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t skip_indicator:4, rr_protocol_discriminator:4;
+	uint8_t system_information;
+	uint16_t cell_identity;
+	struct gsm48_loc_area_id lai;
+	struct gsm48_cell_options cell_options;
+	uint8_t ncc_permitted;
+	uint8_t rest_octets[0];
+#endif
 } __attribute__ ((packed));
 
 /* Section 9.1.43a System Information type 13 */
@@ -857,10 +1199,15 @@
 
 /* Section 9.1.9 */
 struct gsm48_cip_mode_cmd {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t sc:1,
 		 alg_id:3,
 		 cr:1,
 		 spare:3;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t spare:3, cr:1, alg_id:3, sc:1;
+#endif
 } __attribute__((packed));
 
 /* Section 9.1.11 */
@@ -905,6 +1252,7 @@
 
 /* Section 9.1.22 */
 struct gsm48_paging1 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t l2_plen;
 	uint8_t proto_discr;
 	uint8_t msg_type;
@@ -913,10 +1261,19 @@
 		 cneed1:2,
 		 cneed2:2;
 	uint8_t data[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t l2_plen;
+	uint8_t proto_discr;
+	uint8_t msg_type;
+	uint8_t cneed2:2, cneed1:2, spare:2, pag_mode:2;
+	uint8_t data[0];
+#endif
 } __attribute__((packed));
 
 /* Section 9.1.23 */
 struct gsm48_paging2 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t l2_plen;
 	uint8_t proto_discr;
 	uint8_t msg_type;
@@ -927,10 +1284,21 @@
 	uint32_t tmsi1;
 	uint32_t tmsi2;
 	uint8_t data[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t l2_plen;
+	uint8_t proto_discr;
+	uint8_t msg_type;
+	uint8_t cneed2:2, cneed1:2, spare:2, pag_mode:2;
+	uint32_t tmsi1;
+	uint32_t tmsi2;
+	uint8_t data[0];
+#endif
 } __attribute__((packed));
 
 /* Section 9.1.24 */
 struct gsm48_paging3 {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t l2_plen;
 	uint8_t proto_discr;
 	uint8_t msg_type;
@@ -946,15 +1314,36 @@
 		 cneed4:2,
 		 spare2:4;
 	uint8_t rest[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t l2_plen;
+	uint8_t proto_discr;
+	uint8_t msg_type;
+	uint8_t cneed2:2, cneed1:2, spare:2, pag_mode:2;
+	uint32_t tmsi1;
+	uint32_t tmsi2;
+	uint32_t tmsi3;
+	uint32_t tmsi4;
+	uint8_t spare2:4, cneed4:2, cneed3:2;
+	uint8_t rest[0];
+#endif
 } __attribute__((packed));
 
 /* Section 9.1.25 */
 struct gsm48_pag_rsp {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t key_seq:3,
 		 spare:5;
 	uint8_t cm2_len;
 	struct gsm48_classmark2 cm2;
 	uint8_t data[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t spare:5, key_seq:3;
+	uint8_t cm2_len;
+	struct gsm48_classmark2 cm2;
+	uint8_t data[0];
+#endif
 } __attribute__((packed));
 
 /* Section 9.1.29 */
diff --git a/include/osmocom/gsm/protocol/gsm_04_08_gprs.h b/include/osmocom/gsm/protocol/gsm_04_08_gprs.h
index 61304c0..2ec0aa7 100644
--- a/include/osmocom/gsm/protocol/gsm_04_08_gprs.h
+++ b/include/osmocom/gsm/protocol/gsm_04_08_gprs.h
@@ -7,6 +7,7 @@
 #include <stdbool.h>
 #include <osmocom/gsm/protocol/gsm_04_08.h>
 #include <osmocom/crypt/gprs_cipher.h>
+#include <osmocom/core/endian.h>
 
 /* Table 10.4 / 10.4a, GPRS Mobility Management (GMM) */
 #define GSM48_MT_GMM_ATTACH_REQ		0x01
@@ -120,11 +121,19 @@
 
 /* Chapter 9.4.15 / Table 9.4.15 */
 struct gsm48_ra_upd_ack {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t force_stby:4,	/* 10.5.5.7 */
 		 upd_result:4;	/* 10.5.5.17 */
 	uint8_t ra_upd_timer;	/* 10.5.7.3 */
 	struct gsm48_ra_id ra_id; /* 10.5.5.15 */
 	uint8_t data[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t upd_result:4, force_stby:4;
+	uint8_t ra_upd_timer;
+	struct gsm48_ra_id ra_id;
+	uint8_t data[0];
+#endif
 } __attribute__((packed));
 
 /* Chapter 10.5.7.3 */
@@ -140,28 +149,50 @@
 
 /* Chapter 9.4.2 / Table 9.4.2 */
 struct gsm48_attach_ack {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t att_result:4,	/* 10.5.5.7 */
 		 force_stby:4;	/* 10.5.5.1 */
 	uint8_t ra_upd_timer;	/* 10.5.7.3 */
 	uint8_t radio_prio;	/* 10.5.7.2 */
 	struct gsm48_ra_id ra_id; /* 10.5.5.15 */
 	uint8_t data[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t force_stby:4, att_result:4;
+	uint8_t ra_upd_timer;
+	uint8_t radio_prio;
+	struct gsm48_ra_id ra_id;
+	uint8_t data[0];
+#endif
 } __attribute__((packed));
 
 /* Chapter 9.4.9 / Table 9.4.9 */
 struct gsm48_auth_ciph_req {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t ciph_alg:4,	/* 10.5.5.3 */
 		imeisv_req:4;	/* 10.5.5.10 */
 	uint8_t force_stby:4,	/* 10.5.5.7 */
 		ac_ref_nr:4;	/* 10.5.5.19 */
 	uint8_t data[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t imeisv_req:4, ciph_alg:4;
+	uint8_t ac_ref_nr:4, force_stby:4;
+	uint8_t data[0];
+#endif
 } __attribute__((packed));
 /* optional: TV RAND, TV CKSN */
 
 struct gsm48_auth_ciph_resp {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t ac_ref_nr:4,
 		spare:4;
 	uint8_t data[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t spare:4, ac_ref_nr:4;
+	uint8_t data[0];
+#endif
 } __attribute__((packed));
 
 /* Chapter 9.5.1 / Table 9.5.1 */
diff --git a/include/osmocom/gsm/protocol/gsm_04_12.h b/include/osmocom/gsm/protocol/gsm_04_12.h
index 826e69b..3f34ee7 100644
--- a/include/osmocom/gsm/protocol/gsm_04_12.h
+++ b/include/osmocom/gsm/protocol/gsm_04_12.h
@@ -4,6 +4,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <osmocom/core/endian.h>
 
 #define GSM412_MSG_LEN		88	/* TS 04.12 Section 3.1 */
 #define GSM412_BLOCK_LEN	22	/* TS 04.12 Section 3.1 */
@@ -16,17 +17,30 @@
 #define GSM412_SEQ_NULL_MSG		0xf
 
 struct gsm412_block_type {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t	seq_nr : 4,
 		lb : 1,
 		lpd : 2,
 		spare : 1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t	spare:1, lpd:2, lb:1, seq_nr:4;
+#endif
 } __attribute__((packed));
 
 struct gsm412_sched_msg {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t beg_slot_nr : 6,
 		type : 2;
 	uint8_t end_slot_nr : 6,
 		spare1 : 1, spare2: 1;
 	uint8_t cbsms_msg_map[6];
 	uint8_t data[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t type:2, beg_slot_nr:6;
+	uint8_t spare2:1, spare1:1, end_slot_nr:6;
+	uint8_t cbsms_msg_map[6];
+	uint8_t data[0];
+#endif
 } __attribute__((packed));
diff --git a/include/osmocom/gsm/protocol/gsm_04_14.h b/include/osmocom/gsm/protocol/gsm_04_14.h
index 6f7d92c..5ef7837 100644
--- a/include/osmocom/gsm/protocol/gsm_04_14.h
+++ b/include/osmocom/gsm/protocol/gsm_04_14.h
@@ -25,29 +25,26 @@
 
 #define GSM414_MT_CLOSE_MSLOT_LOOP_CMD	0x20	/* 8.4 */
 struct gsm414_close_mslot_loop_cmd {
-#if OSMO_IS_LITTLE_ENDIAN == 1
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t chc:2,
 		loop_mech:3,
 		tn:3;
-#else
-	uint8_t tn:3,
-		loop_mech:3,
-		chc:2;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t tn:3, loop_mech:3, chc:2;
 #endif
 } __attribute__((packed));
 
 #define GSM414_MT_CLOSE_MSLOT_LOOP_ACK	0x21	/* 8.5 */
 struct gsm414_close_mslot_loop_ack {
-#if OSMO_IS_LITTLE_ENDIAN == 1
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t err_ind:1,
 		loop_mech:3,
 		chc:2,
 		spare:2;
-#else
-	uint8_t spare:2,
-		chc:2,
-		loop_mech:3,
-		err_ind:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t spare:2, chc:2, loop_mech:3, err_ind:1;
 #endif
 } __attribute__((packed));
 
@@ -65,34 +62,32 @@
 
 #define GSM414_MT_GPRS_TEST_MODE_CMD	0x24	/* 8.13 */
 struct gsm414_gprs_test_mode_cmd {
-#if OSMO_IS_LITTLE_ENDIAN == 1
+#if OSMO_IS_LITTLE_ENDIAN
 	uint16_t d:12,
 		spare:3,
 		l:1;
 	uint8_t m:1,
 		dl_tx_offset:3,
 		_spare:4;
-#else
-	uint16_t l:1,
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint16_t d:12,
 		spare:3,
-		d:12;
-	uint8_t _spare:4,
-		dl_tx_offset:3,
-		m:1;
+		l:1;
+	uint8_t _spare:4, dl_tx_offset:3, m:1;
 #endif
 } __attribute__((packed));
 
 
 #define GSM414_MT_EGPRS_ST_RB_LOOP_CMD	0x25	/* 8.14 */
 struct gsm414_egprs_st_sb_loop_cmd {
-#if OSMO_IS_LITTLE_ENDIAN == 1
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t _spare:4,
 		dl_tx_offset:3,
 		m:1;
-#else
-	uint8_t m:1,
-		dl_tx_offset:3,
-		_spare:4;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t m:1, dl_tx_offset:3, _spare:4;
 #endif
 } __attribute__((packed));
 
diff --git a/include/osmocom/gsm/protocol/gsm_08_58.h b/include/osmocom/gsm/protocol/gsm_08_58.h
index 363f33d..3ea4e63 100644
--- a/include/osmocom/gsm/protocol/gsm_08_58.h
+++ b/include/osmocom/gsm/protocol/gsm_08_58.h
@@ -594,10 +594,15 @@
 
 /*! RSL Cell Broadcast Command (Chapter 9.3.45) */
 struct rsl_ie_cb_cmd_type {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t last_block:2;
 	uint8_t spare:1;
 	uint8_t def_bcast:1;
 	uint8_t command:4;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t command:4, def_bcast:1, spare:1, last_block:2;
+#endif
 } __attribute__ ((packed));
 /* ->command */
 #define RSL_CB_CMD_TYPE_NORMAL		0x00
@@ -732,14 +737,21 @@
 };
 
 struct ipac_preproc_ave_cfg {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t h_reqave:5,
 		param_id:2,
 		reserved:1;
 	uint8_t h_reqt:5,
 		ave_method:3;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t reserved:1, param_id:2, h_reqave:5;
+	uint8_t ave_method:3, h_reqt:5;
+#endif
 }__attribute__ ((packed));
 
 struct ipac_preproc_ho_thresh {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t l_rxlev_ul_h:6,
 		reserved_l_rxlev_ul:2;
 	uint8_t l_rxlev_dl_h:6,
@@ -754,9 +766,19 @@
 		reserved_rxqual_dl:1;
 	uint8_t ms_range_max:6,
 		reserved_ms_range:2;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t reserved_l_rxlev_ul:2, l_rxlev_ul_h:6;
+	uint8_t reserved_l_rxlev_dl:2, l_rxlev_dl_h:6;
+	uint8_t reserved_rxlev_ul:2, rxlev_ul_ih:6;
+	uint8_t reserved_rxlev_dl:2, rxlev_dl_ih:6;
+	uint8_t reserved_rxqual_dl:1, l_rxqual_dl_h:3, reserved_rxlqual_ul:1, l_rxqual_ul_h:3;
+	uint8_t reserved_ms_range:2, ms_range_max:6;
+#endif
 }__attribute__ ((packed));
 
 struct ipac_preproc_ho_comp {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t p5:5,
 		reserved_p5:3;
 	uint8_t n5:5,
@@ -777,30 +799,61 @@
 		reserved_ho:3;
 	uint8_t reserved;
 
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t reserved_p5:3, p5:5;
+	uint8_t reserved_n5:3, n5:5;
+	uint8_t reserved_p6:3, p6:5;
+	uint8_t reserved_n6:3, n6:5;
+	uint8_t reserved_p7:3, p7:5;
+	uint8_t reserved_n7:3, n7:5;
+	uint8_t reserved_p8:3, p8:5;
+	uint8_t reserved_n8:3, n8:5;
+	uint8_t reserved_ho:3, ho_interval:5;
+	uint8_t reserved;
+#endif
 }__attribute__ ((packed));
 
 struct ipac_preproc_ho_candidates {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t bsic:6,
 		reserved0:2;
 	uint8_t bcch_freq:5,
 		ba_used:1,
 		s:1,
 		reserved1:1;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t reserved0:2, bsic:6;
+	uint8_t reserved1:1, s:1, ba_used:1, bcch_freq:5;
+#endif
 }__attribute__ ((packed));
 
 struct ipac_preproc_ncell_dflts {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t rxlev_min_def:6,
 		reserved_rxlev_min_def:2;
 	uint8_t ho_margin_def:5,
 		reserved_ho_margin_def:3;
 	uint8_t ms_txpwr_max_def:5,
 		reserved_ms_txpwr_max_def:3;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t reserved_rxlev_min_def:2, rxlev_min_def:6;
+	uint8_t reserved_ho_margin_def:3, ho_margin_def:5;
+	uint8_t reserved_ms_txpwr_max_def:3, ms_txpwr_max_def:5;
+#endif
 }__attribute__ ((packed));
 
 struct ipac_preproc_ho_ctl_param {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t sdcch_ho_gsm:1,
 		sdcch_ho_umts:1,
 		reserved:6;
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t reserved:6, sdcch_ho_umts:1, sdcch_ho_gsm:1;
+#endif
 }__attribute__ ((packed));
 
 struct ipac_preproc_cfg {
diff --git a/include/osmocom/gsm/protocol/gsm_44_318.h b/include/osmocom/gsm/protocol/gsm_44_318.h
index 6ac02cf..b3942be 100644
--- a/include/osmocom/gsm/protocol/gsm_44_318.h
+++ b/include/osmocom/gsm/protocol/gsm_44_318.h
@@ -4,6 +4,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <osmocom/core/endian.h>
 
 /* Table 11.1.1.2.1: Protocol Discriminator */
 enum gan_pdisc {
@@ -154,15 +155,24 @@
 
 /* 11.1.1 GA-RC and GA-CSR Message header IE */
 struct gan_rc_csr_hdr {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint16_t len;
 	uint8_t pdisc:4,
 		skip_ind:4;
 	uint8_t msg_type;
 	uint8_t data[0];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint16_t len;
+	uint8_t skip_ind:4, pdisc:4;
+	uint8_t msg_type;
+	uint8_t data[0];
+#endif
 } __attribute__((packed));
 
 /* 11.2.14.1: GAN Control Channel Description IE */
 struct gan_cch_desc_ie {
+#if OSMO_IS_LITTLE_ENDIAN
 	uint8_t spare:1,
 		ecmc:1,
 		nmo:2,
@@ -179,4 +189,12 @@
 		tgecs:2,
 		spare2:2;
 	uint8_t access_class[2];
+#elif OSMO_IS_BIG_ENDIAN
+/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
+	uint8_t mscr:1, att:1, dtm:1, gprs:1, nmo:2, ecmc:1, spare:1;
+	uint8_t t3212;
+	uint8_t rac;
+	uint8_t spare2:2, tgecs:2, pfcfm:1, re:1, ecmp:1, sgsnr:1;
+	uint8_t access_class[2];
+#endif
 } __attribute__((packed));