nuttx/boards/xtensa/esp32/common/scripts/kernel-space.ld

/****************************************************************************
 * boards/xtensa/esp32/common/scripts/kernel-space.ld
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

#include <nuttx/config.h>

/* Provide these so there is no need for using config files for this */

__uirom_start = ORIGIN(UIROM);
__uirom_size = LENGTH(UIROM);
__uirom_end = ORIGIN(UIROM) + LENGTH(UIROM);
__udrom_start = ORIGIN(UDROM);
__udrom_size = LENGTH(UDROM);
__udrom_end = ORIGIN(UDROM) + LENGTH(UDROM);
__uiram_start = ORIGIN(UIRAM);
__uiram_size = LENGTH(UIRAM);
__uiram_end = ORIGIN(UIRAM) + LENGTH(UIRAM);
__udram_start = ORIGIN(UDRAM);
__udram_size = LENGTH(UDRAM);
__udram_end = ORIGIN(UDRAM) + LENGTH(UDRAM);

/* Provide the kernel boundaries as well */

__kirom_start = ORIGIN(KIROM);
__kirom_size = LENGTH(KIROM);
__kdrom_start = ORIGIN(KDROM);
__kdrom_size = LENGTH(KDROM);
__kdrom_start = ORIGIN(KDROM);
__kdrom_size = LENGTH(KDROM);
__kiram_0_start = ORIGIN(KIRAM_0);
__kiram_0_size = LENGTH(KIRAM_0);
__kiram_0_end = ORIGIN(KIRAM_0) + LENGTH(KIRAM_0);
__kiram_1_start = ORIGIN(KIRAM_1);
__kiram_1_size = LENGTH(KIRAM_1);
__kiram_1_end = ORIGIN(KIRAM_1) + LENGTH(KIRAM_1);
__kdram_0_start = ORIGIN(KDRAM_0);
__kdram_0_size = LENGTH(KDRAM_0);
__kdram_0_end = ORIGIN(KDRAM_0) + LENGTH(KDRAM_0);
__kdram_1_start = ORIGIN(KDRAM_1);
__kdram_1_size = LENGTH(KDRAM_1);
__kdram_1_end = ORIGIN(KDRAM_1) + LENGTH(KDRAM_1);

/* Heap ends at top of dram0_0_seg */

_eheap = 0x40000000;

ENTRY(_stext)

SECTIONS
{
  /* Send .iram0 code to iram */

  .iram0.vectors :
  {
    /* Vectors go to IRAM */

    _init_start = ABSOLUTE(.);

    __vectors_start = ABSOLUTE(.);

    /* Vectors according to builds/RF-2015.2-win32/esp108_v1_2_s5_512int_2/config.html */

    . = 0x0;
    KEEP (*(.window_vectors.text));
    . = 0x180;
    KEEP (*(.xtensa_level2_vector.text));
    . = 0x1c0;
    KEEP (*(.xtensa_level3_vector.text));
    . = 0x200;
    KEEP (*(.xtensa_level4_vector.text));
    . = 0x240;
    KEEP (*(.xtensa_level5_vector.text));
    . = 0x280;
    KEEP (*(.debug_exception_vector.text));
    . = 0x2c0;
    KEEP (*(.nmi_vector.text));
    . = 0x300;
    KEEP (*(.kernel_exception_vector.text));
    . = 0x340;
    KEEP (*(.user_exception_vector.text));
    . = 0x3c0;
    KEEP (*(.double_exception_vector.text));
    . = 0x400;
    *(.*_vector.literal)

    . = ALIGN (16);

    __vectors_end = ABSOLUTE(.);

    *(.entry.text)
    *(.init.literal)
    *(.init)

    _init_end = ABSOLUTE(.);
  } >KIRAM_0

  .iram0.text :
  {
    /* Code marked as running out of IRAM */

    _iram_text_start = ABSOLUTE(.);
    *(.iram1 .iram1.*)
    *librtc.a:(.literal .text .literal.* .text.*)
    *libkarch.a:esp_spiflash.*(.literal .text .literal.* .text.*)
    *libkarch.a:*esp_clk.*(.text .text.* .literal .literal.*)
    *libkarch.a:xtensa_cpupause.*(.literal .text .literal.* .text.*)
    *libkarch.a:xtensa_copystate.*(.literal .text .literal.* .text.*)
    *libkarch.a:xtensa_interruptcontext.*(.literal .text .literal.* .text.*)
    *libkarch.a:xtensa_testset.*(.literal .text .literal.* .text.*)
    *libkarch.a:esp_app_desc.*(.literal .text .literal.* .text.*)

    *libc.a:arch_atomic.*(.literal .text .literal.* .text.*)

    *libsched.a:sched_suspendscheduler.*(.literal .text .literal.* .text.*)
    *libsched.a:sched_note.*(.literal .text .literal.* .text.*)
    *libsched.a:sched_thistask.*(.literal .text .literal.* .text.*)
    *libsched.a:spinlock.*(.literal .text .literal.* .text.*)
    *libsched.a:irq_csection.*(.literal .text .literal.* .text.*)
    *libsched.a:irq_dispatch.*(.literal .text .literal.* .text.*)
    *libkarch.a:esp_spiflash.*(.literal .text .literal.* .text.*)
    *libkarch.a:esp_flash_api.*(.text .text.* .literal .literal.*)
    *libkarch.a:esp_flash_spi_init.*(.text .text.* .literal .literal.*)
    *libkarch.a:spi_flash_hal_iram.*(.literal .literal.* .text .text.*)
    *libkarch.a:spi_flash_encrypt_hal_iram.*(.text .text.* .literal .literal.*)
    *libkarch.a:spi_flash_hal_gpspi.*(.literal .literal.* .text .text.*)
    *libkarch.a:spi_flash_chip*.*(.literal .literal.* .text .text.*)
    *libkarch.a:spi_flash_wrap.*(.literal .literal.* .text .text.*)
    *libkarch.a:spi_flash_os_func_noos.*(.literal .literal.* .text .text.*)
    *libkarch.a:spi_flash_os_func_app.*(.literal .literal.* .text .text.*)
    *libkarch.a:flash_brownout_hook.*(.literal .literal.* .text .text.*)
    *libkarch.a:esp_cache_utils.*(.literal .literal.* .text .text.*)
    *libkarch.a:cache_esp32.*(.literal .literal.* .text .text.*)
    *libkarch.a:cache_hal_esp32.*(.literal .literal.* .text .text.*)
    *libkarch.a:cache_utils.*(.literal .literal.* .text .text.*)
    *libkarch.a:memspi_host_driver.*(.literal .literal.* .text .text.*)
    *libkarch.a:critical_section.*(.literal .literal.* .text .text.*)
    *libkarch.a:os.*(.literal.nuttx_enter_critical .text.nuttx_enter_critical)
    *libkarch.a:os.*(.literal.nuttx_exit_critical .text.nuttx_exit_critical)
    *libkarch.a:intr_alloc.*(.literal.esp_intr_get_intno .text.esp_intr_get_intno)
    *libkarch.a:intr_alloc.*(.literal.esp_intr_get_cpu .text.esp_intr_get_cpu)
    *libkarch.a:interrupt.*(.literal.intr_handler_get .text.intr_handler_get)
    *libkarch.a:interrupt.*(.literal.intr_handler_get_arg .text.intr_handler_get_arg)
    *libkarch.a:interrupt.*(.literal.intr_get_item .text.intr_get_item)
    *libkarch.a:interrupt.*(.literal.intr_handler_get_arg .text.intr_handler_get_arg)

#ifdef CONFIG_ESPRESSIF_SIMPLE_BOOT
    /* Simple boot has no second-stage bootloader.  __start() runs
     * bootloader_init() and map_rom_segments() before any flash mapping
     * exists, so everything they reach must be resident in RAM.
     */

    /* __start() itself runs before the mapping it creates, so it cannot
     * live in the flash it is about to map.
     */

    esp32_start.*(.literal .text .literal.* .text.*)

    *libkarch.a:*esp_loader.*(.literal .text .literal.* .text.*)
    *libkarch.a:*bootloader_init.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_common.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_common_loader.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_console.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_console_loader.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_banner_wrap.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_clock_init.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_clock_loader.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_efuse.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_esp32.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_flash.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_flash_config_esp32.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_mem.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_panic.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_random.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_random_esp32.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_sha.*(.text .text.* .literal .literal.*)
    *libkarch.a:*bootloader_soc.*(.text .text.* .literal .literal.*)
    *libkarch.a:*esp_image_format.*(.text .text.* .literal .literal.*)
    *libkarch.a:*flash_encrypt.*(.text .text.* .literal .literal.*)
    *libkarch.a:*flash_qio_mode.*(.text .text.* .literal .literal.*)
    *libkarch.a:*brownout_hal.*(.text .text.* .literal .literal.*)
    *libkarch.a:*cpu.*(.text .text.* .literal .literal.*)
    *libkarch.a:*cpu_region_protect.*(.text .text.* .literal .literal.*)
    *libkarch.a:*gpio_hal.*(.text .text.* .literal .literal.*)
    *libkarch.a:*periph_ctrl.*(.text .text.* .literal .literal.*)
    *libkarch.a:*clk.*(.text .text.* .literal .literal.*)
    *libkarch.a:*clk_tree_hal.*(.text .text.* .literal .literal.*)
    *libkarch.a:*esp_clk_tree.*(.text .text.* .literal .literal.*)
    *libkarch.a:*esp_clk_tree_common.*(.text .text.* .literal .literal.*)
    *libkarch.a:*rtc_init.*(.text .text.* .literal .literal.*)
    *libkarch.a:*rtc_clk.*(.text .text.* .literal .literal.*)
    *libkarch.a:*rtc_clk_init.*(.text .text.* .literal .literal.*)
    *libkarch.a:*rtc_sleep.*(.text .text.* .literal .literal.*)
    *libkarch.a:*rtc_time.*(.text .text.* .literal .literal.*)
    *libkarch.a:*regi2c_ctrl.*(.text .text.* .literal .literal.*)
    *libkarch.a:*efuse_hal.*(.text .text.* .literal .literal.*)
    *libkarch.a:*efuse_utility.*(.text .text.* .literal .literal.*)
    *libkarch.a:*mmu_hal.*(.text .text.* .literal .literal.*)
    *libkarch.a:*mpu_hal.*(.text .text.* .literal .literal.*)
    *libkarch.a:*cache_esp32.*(.text .text.* .literal .literal.*)
    *libkarch.a:*cache_hal_esp32.*(.text .text.* .literal .literal.*)
    *libkarch.a:*uart_hal.*(.text .text.* .literal .literal.*)
    *libkarch.a:*uart_hal_iram.*(.text .text.* .literal .literal.*)
    *libkarch.a:*uart_periph.*(.text .text.* .literal .literal.*)
    *libkarch.a:*wdt_hal_iram.*(.text .text.* .literal .literal.*)
    *libkarch.a:*esp_rom_uart.*(.text .text.* .literal .literal.*)
    *libkarch.a:*esp_rom_sys.*(.text .text.* .literal .literal.*)
    *libkarch.a:*esp_rom_spiflash.*(.text .text.* .literal .literal.*)
    *libkarch.a:*esp_rom_wdt.*(.text .text.* .literal .literal.*)
    *libkarch.a:*log.*(.text .text.* .literal .literal.*)
    *libkarch.a:*log_lock.*(.literal .literal.* .text .text.*)
    *libkarch.a:*log_print.*(.literal .literal.* .text .text.*)
    *libkarch.a:*log_timestamp.*(.literal .literal.* .text .text.*)
    *libkarch.a:*log_timestamp_common.*(.literal .literal.* .text .text.*)
    *libkarch.a:*log_write.*(.literal .literal.* .text .text.*)
    *libkarch.a:esp_app_desc.*(.literal .literal.* .text .text.*)
    *libkarch.a:esp_flash_api.*(.text .text.* .literal .literal.*)
    *libkarch.a:esp_flash_spi_init.*(.text .text.* .literal .literal.*)
    *libkarch.a:spi_flash_hal_gpspi.*(.literal .literal.* .text .text.*)
    *libkarch.a:spi_flash_encrypt_hal_iram.*(.text .text.* .literal .literal.*)
    *libkarch.a:spi_flash_os_func_noos.*(.literal .literal.* .text .text.*)
    *libkarch.a:spi_flash_os_func_app.*(.literal .literal.* .text .text.*)
    *libkarch.a:spi_flash_wrap.*(.literal .literal.* .text .text.*)
#endif

    *(.wifirxiram .wifirxiram.*)
    *(.wifi0iram  .wifi0iram.*)
    *(.wifislpiram .wifislpiram.*)
    *(.wifislprxiram .wifislprxiram.*)
    *(.phyiram .phyiram.*)
    _iram_text_end = ABSOLUTE(.);

    /* IRAM heap starts at the end of iram0_0_seg */

    . = ALIGN (4);
    _siramheap = ABSOLUTE(.);
  } >KIRAM_1

  /* Shared RAM */

  .dram0.bss (NOLOAD) :
  {
    /* .bss initialized on power-up */

    . = ALIGN (8);
    _sbss = ABSOLUTE(.);
    _bss_start = ABSOLUTE(.);
    *(.ext_ram.bss*)
    _bt_bss_start = ABSOLUTE(.);
    *libbt.a:(.bss .bss.* COMMON)
    . = ALIGN (4);
    _bt_bss_end = ABSOLUTE(.);
    _btdm_bss_start = ABSOLUTE(.);
    *libbtdm_app.a:(.bss .bss.* COMMON)
    . = ALIGN (4);
    _btdm_bss_end = ABSOLUTE(.);
    . = ALIGN (8);
    *(.dynsbss)
    *(.sbss)
    *(.sbss.*)
    *(.gnu.linkonce.sb.*)
    *(.scommon)
    *(.sbss2)
    *(.sbss2.*)
    *(.gnu.linkonce.sb2.*)
    *(.dynbss)
    KEEP (*(.bss))
    *(.bss.*)
    *(.share.mem)
    *(.gnu.linkonce.b.*)
    *(COMMON)
    *libkarch.a:esp_spiflash.*(.bss  .bss.*  COMMON)
    *libkarch.a:xtensa_cpupause.*(.bss  .bss.*  COMMON)
    *libkarch.a:xtensa_copystate.*(.bss  .bss.*  COMMON)
    *libkarch.a:xtensa_interruptcontext.*(.bss  .bss.*  COMMON)
    *libkarch.a:xtensa_testset.*(.bss  .bss.*  COMMON)

    *libsched.a:sched_suspendscheduler.*(.bss  .bss.*  COMMON)
    *libsched.a:sched_thistask.*(.bss  .bss.*  COMMON)
    *libsched.a:sched_note.*(.bss  .bss.*  COMMON)
    *libsched.a:spinlock.*(.bss  .bss.*  COMMON)
    *libsched.a:irq_csection.*(.bss  .bss.*  COMMON)
    *libsched.a:irq_dispatch.*(.bss  .bss.*  COMMON)

    . = ALIGN(8);
    _bss_end = ABSOLUTE(.);
    _ebss = ABSOLUTE(.);
  } >KDRAM_0

  .noinit (NOLOAD):
  {
    /* This section contains data that is not initialized during load,
     * or during the application's initialization sequence.
     */

    *(.noinit)
  } >KDRAM_0

  .dram0.data :
  {
    /* .data initialized on power-up in ROMed configurations. */

    _sdata = ABSOLUTE(.);
    _bt_data_start = ABSOLUTE(.);
    *libbt.a:(.data .data.*)
    . = ALIGN (4);
    _bt_data_end = ABSOLUTE(.);
    _btdm_data_start = ABSOLUTE(.);
    *libbtdm_app.a:(.data .data.*)
    . = ALIGN (4);
    _btdm_data_end = ABSOLUTE(.);
    KEEP (*(.data))
    KEEP (*(.data.*))
    KEEP (*(.gnu.linkonce.d.*))
    KEEP (*(.data1))
    KEEP (*(.sdata))
    KEEP (*(.sdata.*))
    KEEP (*(.gnu.linkonce.s.*))
    KEEP (*(.sdata2))
    KEEP (*(.sdata2.*))
    KEEP (*(.gnu.linkonce.s2.*))
    KEEP (*(.jcr))
    *(.dram1 .dram1.*)
    *libphy.a:(.rodata  .rodata.*)
    *libkarch.a:esp_cache_utils.*(.rodata .rodata.*)
    *libkarch.a:esp_spiflash.*(.rodata  .rodata.*)
    *libkarch.a:*esp_clk.*(.rodata .rodata.*)
    *libkarch.a:xtensa_cpupause.*(.rodata  .rodata.*)
    *libkarch.a:xtensa_copystate.*(.rodata  .rodata.*)
    *libkarch.a:xtensa_interruptcontext.*(.rodata  .rodata.*)
    *libkarch.a:xtensa_testset.*(.rodata  .rodata.*)
    *libkarch.a:spi_flash_chip*.*(.rodata .rodata.*)
    *libkarch.a:critical_section.*(.rodata .rodata.*)
    *libkarch.a:os.*(.rodata.g_int_flags_count .rodata.g_int_flags)
    *libkc.a:arch_atomic.*(.rodata .rodata.*)

#ifdef CONFIG_ESPRESSIF_SIMPLE_BOOT
    /* The read-only data of everything pinned into IRAM above. */

    esp32_start.*(.rodata .rodata.*)

    *libkarch.a:*esp_loader.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_init.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_common.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_common_loader.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_console.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_console_loader.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_banner_wrap.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_clock_init.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_clock_loader.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_efuse.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_esp32.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_flash.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_flash_config_esp32.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_mem.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_panic.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_random.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_random_esp32.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_sha.*(.rodata .rodata.*)
    *libkarch.a:*bootloader_soc.*(.rodata .rodata.*)
    *libkarch.a:*esp_image_format.*(.rodata .rodata.*)
    *libkarch.a:*flash_encrypt.*(.rodata .rodata.*)
    *libkarch.a:*flash_qio_mode.*(.rodata .rodata.*)
    *libkarch.a:*brownout_hal.*(.rodata .rodata.*)
    *libkarch.a:*cpu.*(.rodata .rodata.*)
    *libkarch.a:*cpu_region_protect.*(.rodata .rodata.*)
    *libkarch.a:*gpio_hal.*(.rodata .rodata.*)
    *libkarch.a:*periph_ctrl.*(.rodata .rodata.*)
    *libkarch.a:*clk.*(.rodata .rodata.*)
    *libkarch.a:*clk_tree_hal.*(.rodata .rodata.*)
    *libkarch.a:*esp_clk_tree.*(.rodata .rodata.*)
    *libkarch.a:*esp_clk_tree_common.*(.rodata .rodata.*)
    *libkarch.a:*rtc_init.*(.rodata .rodata.*)
    *libkarch.a:*rtc_clk.*(.rodata .rodata.*)
    *libkarch.a:*rtc_clk_init.*(.rodata .rodata.*)
    *libkarch.a:*rtc_time.*(.rodata .rodata.*)
    *libkarch.a:*regi2c_ctrl.*(.rodata .rodata.*)
    *libkarch.a:*efuse_hal.*(.rodata .rodata.*)
    *libkarch.a:*efuse_utility.*(.rodata .rodata.*)
    *libkarch.a:*mmu_hal.*(.rodata .rodata.*)
    *libkarch.a:*mpu_hal.*(.rodata .rodata.*)
    *libkarch.a:*cache_esp32.*(.rodata .rodata.*)
    *libkarch.a:*cache_hal_esp32.*(.rodata .rodata.*)
    *libkarch.a:*uart_hal.*(.rodata .rodata.*)
    *libkarch.a:*uart_hal_iram.*(.rodata .rodata.*)
    *libkarch.a:*uart_periph.*(.rodata .rodata.*)
    *libkarch.a:*wdt_hal_iram.*(.rodata .rodata.*)
    *libkarch.a:*esp_rom_uart.*(.rodata .rodata.*)
    *libkarch.a:*esp_rom_sys.*(.rodata .rodata.*)
    *libkarch.a:*esp_rom_spiflash.*(.rodata .rodata.*)
    *libkarch.a:*esp_rom_wdt.*(.rodata .rodata.*)
    *libkarch.a:*log.*(.rodata .rodata.*)
    *libkarch.a:esp_app_desc.*(.rodata .rodata.*)
    *libkarch.a:esp_flash_api.*(.rodata .rodata.*)
    *libkarch.a:esp_flash_spi_init.*(.rodata .rodata.*)
#endif

    *libsched.a:sched_suspendscheduler.*(.rodata  .rodata.*)
    *libsched.a:sched_thistask.*(.rodata  .rodata.*)
    *libsched.a:sched_note.*(.rodata  .rodata.*)
    *libsched.a:spinlock.*(.rodata  .rodata.*)
    *libsched.a:irq_csection.*(.rodata  .rodata.*)
    *libsched.a:irq_dispatch.*(.rodata  .rodata.*)

    . = ALIGN(4);
    _edata = ABSOLUTE(.);

    /* Heap starts at the end of .data */

    _sheap = ABSOLUTE(.);
  } >KDRAM_0

  .flash.rodata :
  {
    _srodata = ABSOLUTE(.);_rodata_reserved_start = ABSOLUTE(.);
    _srodata = ABSOLUTE(.);

    /* !DO NOT PUT ANYTHING BEFORE THIS! */
    /* Should be the first.  App version info. */
    *(.rodata_desc .rodata_desc.*)

    *(.rodata)
    *(.rodata.*)
    *(.irom1.text) /* catch stray ICACHE_RODATA_ATTR */
    *(.gnu.linkonce.r.*)
    *(.rodata1)
    __XT_EXCEPTION_TABLE_ = ABSOLUTE(.);
    *(.xt_except_table)
    *(.gcc_except_table)
    *(.gcc_except_table.*)
    *(.gnu.linkonce.e.*)
    *(.gnu.version_r)
    *(.eh_frame)

    . = (. + 3) & ~ 3;

    /* C++ exception handlers table: */

    __XT_EXCEPTION_DESCS_ = ABSOLUTE(.);
    *(.xt_except_desc)
    *(.gnu.linkonce.h.*)
    __XT_EXCEPTION_DESCS_END__ = ABSOLUTE(.);
    *(.xt_except_desc_end)
    *(.dynamic)
    *(.gnu.version_d)
    _erodata = ABSOLUTE(.);
    /* Literals are also RO data. */
    _lit4_start = ABSOLUTE(.);
    *(*.lit4)
    *(.lit4.*)
    *(.gnu.linkonce.lit4.*)
    _lit4_end = ABSOLUTE(.);

    /* C++ constructor tables. Those are initialized by lib_cxx_initialize
     * which calls constructor functions that may be on common source code.
     */

    . = ALIGN(4);
    _sinit = ABSOLUTE(.);
    __init_array_start = ABSOLUTE(.);
    KEEP (*(EXCLUDE_FILE (*crtend.* *crtbegin.*) .ctors SORT(.ctors.*)))
    __init_array_end = ABSOLUTE(.);
    _einit = ABSOLUTE(.);

    /* Addresses of memory regions reserved via SOC_RESERVE_MEMORY_REGION() */

    . = ALIGN(4);
    soc_reserved_memory_region_start = ABSOLUTE(.);
    KEEP (*(.reserved_memory_address))
    soc_reserved_memory_region_end = ABSOLUTE(.);

    /* System init functions registered via ESP_SYSTEM_INIT_FN */

    . = ALIGN(4);
    _esp_system_init_fn_array_start = ABSOLUTE(.);
    KEEP (*(SORT_BY_INIT_PRIORITY(.esp_system_init_fn.*)))
    _esp_system_init_fn_array_end = ABSOLUTE(.);

    . = ALIGN(4);
  } >KDROM

  .flash.text :
  {
    _stext = .;
    _text_start = ABSOLUTE(.);
    *(.literal .text .literal.* .text.* .stub .gnu.warning .gnu.linkonce.literal.* .gnu.linkonce.t.*.literal .gnu.linkonce.t.*)
    *(.irom0.text) /* catch stray ICACHE_RODATA_ATTR */
    *(.fini.literal)
    *(.fini)
    *(.gnu.version)
    _text_end = ABSOLUTE(.);
    _etext = .;
  } >KIROM

#ifdef CONFIG_ESPRESSIF_SIMPLE_BOOT
  /* Simple boot has no second-stage bootloader to map the flash, so __start()
   * does it.  map_rom_segments() reads the segment table out of the image in
   * flash, but the entry point still needs these to be defined.
   */

  _image_irom_vma = ADDR(.flash.text);
  _image_irom_lma = LOADADDR(.flash.text);
  _image_irom_size = LOADADDR(.flash.text) + SIZEOF(.flash.text) -
                     _image_irom_lma;

  _image_drom_vma = ADDR(.flash.rodata);
  _image_drom_lma = LOADADDR(.flash.rodata);
  _image_drom_size = LOADADDR(.flash.rodata) + SIZEOF(.flash.rodata) -
                     _image_drom_lma;
#endif

  .rtc.text :
  {
    . = ALIGN(4);
    _rtc_data_start = ABSOLUTE(.);
    *(.rtc.literal .rtc.text)
  } >rtc_iram_seg AT>ROM

  .rtc.data :
  {
    *(.rtc.data)
    *(.rtc.data.*)
    *(.rtc.rodata)
    *(.rtc.rodata.*)

   /* Whatever is left from the RTC memory is used as a special heap. */

    . = ALIGN (4);
    _srtcheap = ABSOLUTE(.);
  } >rtc_slow_seg AT>ROM

  .rtc.force_slow :
  {
    . = ALIGN(4);
    _rtc_force_slow_start = ABSOLUTE(.);
    *(.rtc.force_slow .rtc.force_slow.*)
    . = ALIGN(4);
    _rtc_force_slow_end = ABSOLUTE(.);
  } >rtc_slow_seg AT>ROM

  /* This section holds RTC FAST data that should have fixed addresses.
   * The data are not initialized at power-up and are retained during deep
   * sleep.
   */

  .rtc_fast_reserved (NOLOAD):
  {
    . = ALIGN(4);
    _rtc_fast_reserved_start = ABSOLUTE(.);

    /* New data can only be added here to ensure existing data are not moved.
     * Because data have adhered to the end of the segment and code is relied
     * on it.
     * >> put new data here <<
     */

    KEEP(*(.bootloader_data_rtc_mem .bootloader_data_rtc_mem.*))

    _rtc_fast_reserved_end = ABSOLUTE(.);
  } > rtc_fast_reserved_seg

  _rtc_fast_reserved_length = _rtc_fast_reserved_end - _rtc_fast_reserved_start;
  ASSERT((_rtc_fast_reserved_length <= LENGTH(rtc_fast_reserved_seg)),
          "RTC FAST reserved segment data does not fit.")

  /* This section holds RTC SLOW data that should have fixed addresses.
   * The data are not initialized at power-up and are retained during deep
   * sleep.
   */

  .rtc_slow_reserved (NOLOAD):
  {
    . = ALIGN(4);
    _rtc_slow_reserved_start = ABSOLUTE(.);

    /* New data can only be added here to ensure existing data are not moved.
     * Because data have adhered to the end of the segment and code is relied
     * on it.
     * >> put new data here <<
     */

    *(.rtc_timer_data_in_rtc_mem .rtc_timer_data_in_rtc_mem.*)

    _rtc_slow_reserved_end = ABSOLUTE(.);
  } > rtc_slow_reserved_seg

  _rtc_slow_reserved_length = _rtc_slow_reserved_end - _rtc_slow_reserved_start;
  _rtc_reserved_length = _rtc_slow_reserved_length;

  /* Get size of rtc slow data */

  _rtc_slow_length = (_rtc_force_slow_end - _rtc_data_start);
}