esp32: add Bluetooth controller ROM symbols and reserve its memory

The Bluetooth controller blob libbtdm_app.a gets most of its code from the
ESP32 ROM. targets/esp32.ld gave no Bluetooth ROM symbol, so the blob could
not link. This adds the 273 symbols that the blob and the driver need. The
addresses come from ESP-IDF v5.5 components/esp_rom/esp32/ld/esp32.rom.ld and
are the same on all ESP32 silicon revisions.

The controller also uses exchange memory at 0x3FFB0000 and BSS at 0x3FFB8000.
These addresses are fixed in ROM and were inside the stack and the Go heap.
The new .btdm_reserved section keeps this 64K block free.

The reservation occurs only when the espradio Bluetooth driver is linked in,
because the section length tests for the driver symbol _btdm_mem_needed and
--gc-sections removes that symbol with the driver. A program that uses
Bluetooth has a heap of 122K. All other programs keep the full 186K.

This is the first of three changes that give Bluetooth LE to the classic
ESP32. The driver changes are in espradio.

Author: deadprogram

targets/esp32.ld

@@ -18,7 +18,8 @@ MEMORY
     /* SRAM2 usable DRAM (0x3FFB0000-0x3FFE0000, 192K): reserve the first 8KB
      * (0x3FFAE000-0x3FFB0000) for ROM PHY data (rom_phyFuns at 0x3FFAE0C0),
      * then use the rest for the stack, initialized .data, .bss, and the Go
-     * GC heap. */
+     * GC heap. The .btdm_reserved section below keeps the first 64K free when
+     * the Bluetooth driver is linked in. */
     DRAM  (rw) : ORIGIN = 0x3FFB0000, LENGTH = 192K
 
     /* Top of SRAM1 (0x3FFF0000-0x40000000, 64K): pool 7 + pool 6. This is the
@@ -55,6 +56,22 @@ SECTIONS
         _rodata_end = ABSOLUTE(.);
     } >DROM
 
+    /* The Bluetooth controller uses exchange memory at 0x3FFB0000 and BSS at
+     * 0x3FFB8000. The addresses are fixed in ROM, so this 64K block must stay
+     * free. The espradio Bluetooth driver defines _btdm_mem_needed. Programs
+     * that do not use Bluetooth keep the 64K, because --gc-sections removes
+     * the symbol with the driver.
+     * See ESP-IDF components/bt/controller/esp32/bt.c, btdm_dram_available_region.
+     */
+    .btdm_reserved (NOLOAD) :
+    {
+        . = ALIGN(4);
+        _btdm_reserved_start = ABSOLUTE(.);
+        . += DEFINED(_btdm_mem_needed) ? 0x10000 : 0;
+        _btdm_reserved_end = ABSOLUTE(.);
+    } >DRAM
+    ASSERT(_btdm_reserved_start == 0x3FFB0000, "BT reserved block must start at 0x3FFB0000")
+
     /* Put the stack at the bottom of DRAM, so that the application will
      * crash on stack overflow instead of silently corrupting memory.
      */
@@ -339,3 +356,288 @@ PROVIDE(ets_isr_attach = 0x400067ec);
 PROVIDE(ets_isr_mask = 0x400067fc);
 PROVIDE(ets_isr_unmask = 0x40006808);
 PROVIDE(roundup2 = 0x4000ab7c);
+
+/* From ESP-IDF:
+ * components/esp_rom/esp32/ld/esp32.rom.ld
+ * Bluetooth controller ROM functions and data. libbtdm_app.a gets most of its
+ * undefined symbols from here. The addresses are the same on all ESP32
+ * silicon revisions.
+ */
+PROVIDE(AddBigHexModP256 = 0x40015c98);
+PROVIDE(btdm_r_btdm_option_data_p_get = 0x40010004);
+PROVIDE(btdm_r_btdm_rom_version_get = 0x40010078);
+PROVIDE(btdm_r_import_rf_phy_func_p_get = 0x40054298);
+PROVIDE(btdm_r_ip_func_p_get = 0x40019af0);
+PROVIDE(btdm_r_modules_func_p_get = 0x4005427c);
+PROVIDE(btdm_r_plf_func_p_set = 0x40054288);
+PROVIDE(bt_util_buf_env = 0x3ffb8bd4);
+PROVIDE(co_default_bdaddr = 0x3ffae704);
+PROVIDE(co_null_bdaddr = 0x3ffb80e0);
+PROVIDE(_data_start_btdm_rom = 0x4000d4f4);
+PROVIDE(_data_start_btdm = 0x3ffae6e0);
+PROVIDE(_data_end_btdm = 0x3ffaff10);
+PROVIDE(_bss_start_btdm = 0x3ffb8000);
+PROVIDE(_bss_end_btdm = 0x3ffbff70);
+PROVIDE(dbg_state = 0x3ffb8d5d);
+PROVIDE(ecc_env = 0x3ffb8d60);
+PROVIDE(em_buf_env = 0x3ffb8d74);
+PROVIDE(rwip_coex_cfg = 0x3ff9914c);
+PROVIDE(rwip_priority = 0x3ff99159);
+PROVIDE(hci_env = 0x3ffb9350);
+PROVIDE(rwip_env = 0x3ffb8bcc);
+PROVIDE(hci_fc_env = 0x3ffb9340);
+PROVIDE(ke_env = 0x3ffb93cc);
+PROVIDE(ke_handler_search = 0x4001a430);
+PROVIDE(ke_task_env = 0x3ffb81d4);
+PROVIDE(lb_default_state_tab_p_get = 0x4001c198);
+PROVIDE(lb_env = 0x3ffb9424);
+PROVIDE(lb_hci_cmd_handler_tab_p_get = 0x4001c18c);
+PROVIDE(lc_default_state_tab_p_get = 0x4002f494);
+PROVIDE(lc_env = 0x3ffb94ec);
+PROVIDE(lc_hci_cmd_handler_tab_p_get = 0x4002f488);
+PROVIDE(lc_state = 0x3ffb9508);
+PROVIDE(ld_env = 0x3ffb9510);
+PROVIDE(llc_default_state_tab_p_get = 0x40046058);
+PROVIDE(llc_env = 0x3ffb96d0);
+PROVIDE(llc_hci_cmd_handler_tab_p_get = 0x40042358);
+PROVIDE(llcp_pdu_handler_tab_p_get = 0x40043f64);
+PROVIDE(lld_evt_deferred_elt_push = 0x400466b4);
+PROVIDE(lld_evt_deferred_elt_pop = 0x400466dc);
+PROVIDE(lld_evt_slave_time_compute = 0x40046818);
+PROVIDE(lld_evt_env = 0x3ffb9704);
+PROVIDE(lld_evt_elt_wait_get = 0x400468e4);
+PROVIDE(lld_evt_get_next_free_slot = 0x4004692c);
+PROVIDE(lld_pdu_llcp_pk_desc_tab = 0x3ff98b68);
+PROVIDE(lld_pdu_tx_flush_list = 0x4004a760);
+PROVIDE(lld_pdu_pack = 0x4004ab14);
+PROVIDE(LLM_AA_CT1 = 0x3ff98d8a);
+PROVIDE(LLM_AA_CT2 = 0x3ff98d88);
+PROVIDE(llm_default_state_tab_p_get = 0x4004e718);
+PROVIDE(llm_hci_cmd_handler_tab_p_get = 0x4004c920);
+PROVIDE(llm_le_env = 0x3ffb976c);
+PROVIDE(lm_default_state_tab_p_get = 0x40054268);
+PROVIDE(lm_env = 0x3ffb9860);
+PROVIDE(lm_hci_cmd_handler_tab_p_get = 0x4005425c);
+PROVIDE(MultiplyBigHexModP256 = 0x400160b8);
+PROVIDE(one_bits = 0x3ff971f8);
+PROVIDE(r_btdm_option_data = 0x3ffae6e0);
+PROVIDE(r_bt_util_buf_acl_rx_alloc = 0x40010218);
+PROVIDE(r_bt_util_buf_acl_rx_free = 0x40010234);
+PROVIDE(r_bt_util_buf_acl_tx_alloc = 0x40010268);
+PROVIDE(r_bt_util_buf_acl_tx_free = 0x40010280);
+PROVIDE(r_bt_util_buf_lmp_tx_alloc = 0x400101d0);
+PROVIDE(r_bt_util_buf_lmp_tx_free = 0x400101ec);
+PROVIDE(r_bt_util_buf_sync_clear = 0x400103c8);
+PROVIDE(r_bt_util_buf_sync_rx_alloc = 0x40010468);
+PROVIDE(r_bt_util_buf_sync_rx_free = 0x4001049c);
+PROVIDE(r_bt_util_buf_sync_tx_alloc = 0x400103ec);
+PROVIDE(r_bt_util_buf_sync_tx_free = 0x40010428);
+PROVIDE(lm_n192_mod_mul = 0x40011dc0);
+PROVIDE(lm_n192_mod_add = 0x40011e9c);
+PROVIDE(lm_n192_mod_sub = 0x40011eec);
+PROVIDE(ea_conflict_check = 0x40014e9c);
+PROVIDE(ea_prog_timer = 0x40014f88);
+PROVIDE(r_ea_offset_req = 0x40015748);
+PROVIDE(r_ea_time_get_halfslot_rounded = 0x40015894);
+PROVIDE(ecc_point_multiplication_uint8_256 = 0x40016804);
+PROVIDE(r_hci_look_for_cmd_desc = 0x40018454);
+PROVIDE(r_hci_look_for_dbg_evt_desc = 0x400184c4);
+PROVIDE(r_hci_send_2_host = 0x400185bc);
+PROVIDE(r_ke_event_schedule = 0x40019cdc);
+PROVIDE(r_ke_timer_clear = 0x4001ab90);
+PROVIDE(r_ke_timer_set = 0x4001aac0);
+PROVIDE(r_lb_init = 0x4001acd4);
+PROVIDE(r_lb_reset = 0x4001ad38);
+PROVIDE(r_lc_auth_cmp = 0x4001cd54);
+PROVIDE(r_lc_init = 0x4001c948);
+PROVIDE(r_lc_reset = 0x4001c99c);
+PROVIDE(r_lc_sco_host_accept = 0x40022118);
+PROVIDE(r_lc_start = 0x4001ca28);
+PROVIDE(lc_set_encap_pdu_data_p192 = 0x4002e4c8);
+PROVIDE(lc_set_encap_pdu_data_p256 = 0x4002e454);
+PROVIDE(lm_get_auth_method = 0x40023420);
+PROVIDE(lmp_accepted_ext_handler = 0x40027290);
+PROVIDE(lmp_clk_adj_handler = 0x40027468);
+PROVIDE(lmp_clk_adj_ack_handler = 0x400274f4);
+PROVIDE(lmp_clk_adj_req_handler = 0x4002751c);
+PROVIDE(lmp_feats_req_ext_handler = 0x4002ccb0);
+PROVIDE(lmp_pkt_type_tbl_req_handler = 0x40027574);
+PROVIDE(lmp_esco_link_req_handler = 0x40027610);
+PROVIDE(lmp_rmv_esco_link_req_handler = 0x400276e8);
+PROVIDE(lmp_ssr_req_handler = 0x4002780c);
+PROVIDE(lmp_ssr_res_handler = 0x40027900);
+PROVIDE(lmp_pause_enc_req_handler = 0x4002df90);
+PROVIDE(lmp_resume_enc_req_handler = 0x4002e084);
+PROVIDE(lmp_num_comparison_fail_handler = 0x40027a74);
+PROVIDE(lmp_passkey_fail_handler = 0x40027aec);
+PROVIDE(lmp_keypress_notif_handler = 0x4002c5c8);
+PROVIDE(lmp_pwr_ctrl_req_handler = 0x400263bc);
+PROVIDE(lmp_pwr_ctrl_res_handler = 0x40026480);
+PROVIDE(lmp_auto_rate_handler = 0x40026548);
+PROVIDE(lmp_pref_rate_handler = 0x4002657c);
+PROVIDE(lmp_name_req_handler = 0x40025050);
+PROVIDE(lmp_name_res_handler = 0x400250bc);
+PROVIDE(lmp_accepted_handler = 0x4002e894);
+PROVIDE(lmp_clk_off_req_handler = 0x40025a44);
+PROVIDE(lmp_clk_off_res_handler = 0x40025ab8);
+PROVIDE(lmp_detach_handler = 0x40025b74);
+PROVIDE(lmp_tempkey_handler = 0x4002b6b0);
+PROVIDE(lmp_temprand_handler = 0x4002b74c);
+PROVIDE(lmp_sres_handler = 0x4002b840);
+PROVIDE(lmp_aurand_handler = 0x4002bda0);
+PROVIDE(lmp_unitkey_handler = 0x4002c13c);
+PROVIDE(lmp_inrand_handler = 0x4002c414);
+PROVIDE(lmp_oob_fail_handler = 0x40027b84);
+PROVIDE(lmp_ping_req_handler = 0x40027c08);
+PROVIDE(lmp_ping_res_handler = 0x40027c5c);
+PROVIDE(lmp_stop_enc_req_handler = 0x4002de30);
+PROVIDE(lmp_incr_pwr_req_handler = 0x4002629c);
+PROVIDE(lmp_decr_pwr_req_handler = 0x400262f8);
+PROVIDE(lmp_max_pwr_handler = 0x40026354);
+PROVIDE(lmp_min_pwr_handler = 0x40026388);
+PROVIDE(lmp_ver_req_handler = 0x400265f0);
+PROVIDE(lmp_ver_res_handler = 0x40026670);
+PROVIDE(lmp_qos_handler = 0x40026790);
+PROVIDE(lmp_qos_req_handler = 0x40026844);
+PROVIDE(lmp_sco_link_req_handler = 0x40026930);
+PROVIDE(lmp_rmv_sco_link_req_handler = 0x40026a10);
+PROVIDE(lmp_max_slot_handler = 0x40026a54);
+PROVIDE(lmp_max_slot_req_handler = 0x40026aac);
+PROVIDE(lmp_timing_accu_req_handler = 0x40026b54);
+PROVIDE(lmp_timing_accu_res_handler = 0x40026bcc);
+PROVIDE(lmp_setup_cmp_handler = 0x40026c84);
+PROVIDE(lmp_feats_res_handler = 0x4002b548);
+PROVIDE(lmp_feats_req_handler = 0x4002b620);
+PROVIDE(lmp_host_con_req_handler = 0x4002b3d8);
+PROVIDE(lmp_use_semi_perm_key_handler = 0x4002b4c4);
+PROVIDE(lmp_slot_off_handler = 0x40026cc8);
+PROVIDE(lmp_page_mode_req_handler = 0x40026d0c);
+PROVIDE(lmp_page_scan_mode_req_handler = 0x40026d4c);
+PROVIDE(lmp_supv_to_handler = 0x40026d94);
+PROVIDE(lmp_test_activate_handler = 0x40026e7c);
+PROVIDE(lmp_test_ctrl_handler = 0x40026ee4);
+PROVIDE(lmp_enc_key_size_mask_req_handler = 0x40027038);
+PROVIDE(lmp_enc_key_size_mask_res_handler = 0x400270a4);
+PROVIDE(lmp_encaps_hdr_handler = 0x40027120);
+PROVIDE(lmp_sp_nb_handler = 0x4002acf0);
+PROVIDE(lmp_sp_cfm_handler = 0x4002b170);
+PROVIDE(lmp_dhkey_chk_handler = 0x4002ab48);
+PROVIDE(lmp_io_cap_res_handler = 0x4002c670);
+PROVIDE(lmp_io_cap_req_handler = 0x4002c7a4);
+PROVIDE(lc_cmd_cmp_bd_addr_send = 0x4002cec4);
+PROVIDE(ld_acl_tx_packet_type_select = 0x4002fb40);
+PROVIDE(ld_acl_sched = 0x40033268);
+PROVIDE(ld_acl_sniff_sched = 0x4003340c);
+PROVIDE(ld_acl_sniff_exit = 0x400312b4);
+PROVIDE(ld_sco_evt_canceled_cbk = 0x40031e18);
+PROVIDE(ld_acl_rx = 0x4003274c);
+PROVIDE(ld_acl_tx = 0x4002ffdc);
+PROVIDE(ld_acl_rx_sync = 0x4002fbec);
+PROVIDE(ld_acl_rx_sync2 = 0x4002fd8c);
+PROVIDE(ld_acl_rx_no_sync = 0x4002fe78);
+PROVIDE(ld_acl_clk_isr = 0x40030cf8);
+PROVIDE(ld_acl_rsw_frm_cbk = 0x40033bb0);
+PROVIDE(ld_sco_modify = 0x40031778);
+PROVIDE(lm_cmd_cmp_send = 0x40051838);
+PROVIDE(ld_sco_frm_cbk = 0x400349dc);
+PROVIDE(ld_sco_evt_start_cbk = 0x40031afc);
+PROVIDE(ld_sco_evt_stop_cbk = 0x40031d78);
+PROVIDE(ld_acl_rsw_evt_start_cbk = 0x40031154);
+PROVIDE(ld_acl_sco_rsvd_check = 0x4002fa94);
+PROVIDE(ld_acl_sniff_frm_cbk = 0x4003482c);
+PROVIDE(ld_inq_end = 0x4003ab48);
+PROVIDE(ld_inq_sched = 0x4003aba4);
+PROVIDE(ld_inq_frm_cbk = 0x4003ae4c);
+PROVIDE(ld_pscan_frm_cbk = 0x4003ebe4);
+PROVIDE(r_ld_acl_sniff = 0x4003617c);
+PROVIDE(ld_acl_frm_cbk = 0x40034414);
+PROVIDE(ld_acl_rsw_end = 0x40032bc0);
+PROVIDE(ld_acl_end = 0x40033140);
+PROVIDE(ld_acl_resched = 0x40033814);
+PROVIDE(ld_acl_test_mode_update = 0x40032050);
+PROVIDE(ld_csb_tx_sched = 0x40039c1c);
+PROVIDE(ld_csb_tx_evt_start_cbk = 0x40039d0c);
+PROVIDE(ld_csb_tx_evt_canceled_cbk = 0x40039ee4);
+PROVIDE(r_ld_init = 0x4003c294);
+PROVIDE(r_ld_page_start = 0x4003d848);
+PROVIDE(r_ld_reset = 0x4003c714);
+PROVIDE(r_ld_sched_sniff_add = 0x4003f9c4);
+PROVIDE(r_ld_sco_start = 0x40037110);
+PROVIDE(r_ld_sscan_start = 0x40040384);
+PROVIDE(r_llc_common_cmd_status_send = 0x40044ee0);
+PROVIDE(r_llc_init = 0x40044778);
+PROVIDE(r_llc_llcp_recv_handler = 0x40044678);
+PROVIDE(r_llc_reset = 0x400447b8);
+PROVIDE(r_llc_stop = 0x400449ac);
+PROVIDE(r_lld_adv_stop = 0x40048ea0);
+PROVIDE(r_lld_evt_init = 0x40046b3c);
+PROVIDE(r_lld_pdu_tx_flush = 0x4004b414);
+PROVIDE(r_lld_scan_stop = 0x40049190);
+PROVIDE(r_llm_init = 0x4004c9f8);
+PROVIDE(r_lm_init = 0x4004ed34);
+PROVIDE(nvds_null_read = 0x400542a0);
+PROVIDE(nvds_null_write = 0x400542a8);
+PROVIDE(nvds_null_erase = 0x400542b0);
+PROVIDE(nvds_read = 0x400542c4);
+PROVIDE(nvds_write = 0x400542fc);
+PROVIDE(nvds_erase = 0x40054334);
+PROVIDE(nvds_init_memory = 0x40054358);
+PROVIDE(r_rwip_prevent_sleep_set = 0x40055e64);
+PROVIDE(r_rwip_reset = 0x40055ab8);
+PROVIDE(r_rwip_schedule = 0x40055b38);
+PROVIDE(rwip_rf = 0x3ffbdb28);
+PROVIDE(SubtractBigHexMod256 = 0x40015e8c);
+PROVIDE(sw_to_hw = 0x3ffb8d40);
+PROVIDE(hci_le_rd_rem_used_feats_cmd_handler = 0x400417b4);
+PROVIDE(hci_per_inq_mode_cmd_handler = 0x400519b0);
+PROVIDE(llcp_length_req_handler = 0x40043808);
+PROVIDE(llcp_unknown_rsp_handler = 0x40043ba8);
+PROVIDE(llcp_channel_map_req_handler = 0x4004291c);
+PROVIDE(llcp_con_up_req_handler = 0x400426f0);
+PROVIDE(ets_update_cpu_frequency_rom = 0x40008550);
+PROVIDE(hci_tl_env = 0x3ffb8154);
+PROVIDE(ld_acl_env = 0x3ffb8258);
+PROVIDE(ea_env = 0x3ffb80ec);
+PROVIDE(lc_sco_data_path_config = 0x3ffb81f8);
+PROVIDE(lc_sco_env = 0x3ffb81fc);
+PROVIDE(ld_csb_tx_env = 0x3ffb827c);
+PROVIDE(ld_fm_env = 0x3ffb8284);
+PROVIDE(ld_inq_env = 0x3ffb82e4);
+PROVIDE(ld_page_env = 0x3ffb82f0);
+PROVIDE(ld_pscan_env = 0x3ffb8308);
+PROVIDE(ld_sched_env = 0x3ffb830c);
+PROVIDE(ld_sco_env = 0x3ffb824c);
+PROVIDE(LM_Sniff = 0x3ffb8230);
+PROVIDE(LM_SniffSubRate = 0x3ffb8214);
+PROVIDE(nvds_env = 0x3ffb8364);
+PROVIDE(nvds_magic_number = 0x3ff9912a);
+PROVIDE(TASK_DESC_LLD = 0x3ff98b58);
+PROVIDE(ld_acl_evt_canceled_cbk = 0x40033944);
+PROVIDE(ld_acl_rsw_evt_canceled_cbk = 0x40033364);
+PROVIDE(ld_acl_evt_stop_cbk = 0x40033870);
+PROVIDE(ld_acl_evt_start_cbk = 0x40030ab0);
+PROVIDE(ld_acl_sniff_evt_start_cbk = 0x40031360);
+PROVIDE(lc_acl_disc_ind_handler = 0x4002f270);
+PROVIDE(lc_pca_sscan_start_req_handler = 0x40029b34);
+PROVIDE(ld_acl_sniff_trans_sched = 0x40033734);
+PROVIDE(lc_pwr_decr_ind_handler = 0x4002859c);
+PROVIDE(lc_pwr_incr_ind_handler = 0x400284a8);
+PROVIDE(lc_setup_sync_param_check = 0x4002354c);
+PROVIDE(lc_lmp_rsp_to_flow_spec_handler = 0x400297f0);
+PROVIDE(lc_pca_sscan_clk_ind_handler = 0x4002a38c);
+PROVIDE(lc_op_loc_unsniff_req_handler = 0x40028be0);
+PROVIDE(lc_op_loc_sniff_req_handler = 0x40028ccc);
+PROVIDE(lc_op_loc_switch_req_handler = 0x40028df4);
+PROVIDE(lc_op_loc_sync_con_req_handler = 0x40028f6c);
+PROVIDE(lm_sync_conf = 0x3ffb8348);
+PROVIDE(lm_nb_sync_active = 0x3ffb8346);
+PROVIDE(lm_sync_nego = 0x3ffb8345);
+PROVIDE(lm_nego_cnt = 0x3ffb8344);
+PROVIDE(lm_nego_cntl = 0x3ffb8342);
+PROVIDE(lm_nego_max_cnt = 0x3ffb8343);
+PROVIDE(lm_nego_pkt_used = 0x3ffb8340);
+
+/* The Bluetooth controller startup code in libbtdm_app.a refers to the start of
+ * the BSS. TinyGo calls this symbol _sbss.
+ */
+PROVIDE(_bss_start = _sbss);