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sections.ld.in
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sections.ld.in
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/*
* SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "ld.common"
/* Default entry point */
ENTRY(call_start_cpu0);
SECTIONS
{
.iram0.text :
{
_iram_start = ABSOLUTE(.);
/* Vectors go to start of IRAM */
ASSERT(ABSOLUTE(.) % 0x100 == 0, "vector address must be 256 byte aligned");
KEEP(*(.exception_vectors_table.text));
KEEP(*(.exception_vectors.text));
ALIGNED_SYMBOL(4, _invalid_pc_placeholder)
/* Code marked as running out of IRAM */
_iram_text_start = ABSOLUTE(.);
mapping[iram0_text]
} > iram0_0_seg
/**
* This section is required to skip .iram0.text area because iram0_0_seg and
* dram0_0_seg reflect the same address space on different buses.
*/
.dram0.dummy (NOLOAD):
{
. = ORIGIN(dram0_0_seg) + _iram_end - _iram_start;
} > dram0_0_seg
/**
* This section MUST be placed at the beginning of the DRAM0, which will be
* released along with iram0_bt.text when Bluetooth is no longer in use.
*/
.dram0.bt.data :
{
_data_start = ABSOLUTE(.);
mapping[dram0_bt_data]
} > dram0_0_seg
.dram0.bt.bss (NOLOAD) :
{
ALIGNED_SYMBOL(8, _bss_bt_start)
mapping[dram0_bt_bss]
_bss_bt_end = ABSOLUTE(.);
} > dram0_0_seg
.dram0.data :
{
*(.gnu.linkonce.d.*)
*(.data1)
__global_pointer$ = . + 0x800;
*(.sdata)
*(.sdata.*)
*(.gnu.linkonce.s.*)
*(.gnu.linkonce.s2.*)
*(.jcr)
mapping[dram0_data]
_data_end = ABSOLUTE(.);
} > dram0_0_seg
/**
* This section holds data that should not be initialized at power up.
* The section located in Internal SRAM memory region. The macro _NOINIT
* can be used as attribute to place data into this section.
* See the "esp_attr.h" file for more information.
*/
.noinit (NOLOAD):
{
ALIGNED_SYMBOL(4, _noinit_start)
*(.noinit .noinit.*)
ALIGNED_SYMBOL(4, _noinit_end)
} > dram0_0_seg
/* Shared RAM */
.dram0.bss (NOLOAD) :
{
ALIGNED_SYMBOL(8, _bss_start)
/**
* ldgen places all bss-related data to mapping[dram0_bss]
* (See components/esp_system/app.lf).
*/
mapping[dram0_bss]
ALIGNED_SYMBOL(8, _bss_end)
} > dram0_0_seg
ASSERT(((_bss_end - ORIGIN(dram0_0_seg)) <= LENGTH(dram0_0_seg)),
"DRAM segment data does not fit.")
.flash.text :
{
_stext = .;
/**
* Mark the start of flash.text.
* This can be used by the MMU driver to maintain the virtual address.
*/
_instruction_reserved_start = ABSOLUTE(.);
_text_start = ABSOLUTE(.);
mapping[flash_text]
*(.stub)
*(.gnu.linkonce.t.*)
*(.gnu.warning)
*(.irom0.text) /* catch stray ICACHE_RODATA_ATTR */
/**
* CPU will try to prefetch up to 16 bytes of of instructions.
* This means that any configuration (e.g. MMU, PMS) must allow
* safe access to up to 16 bytes after the last real instruction, add
* dummy bytes to ensure this
*/
. += _esp_flash_mmap_prefetch_pad_size;
_text_end = ABSOLUTE(.);
/**
* Mark the flash.text end.
* This can be used for MMU driver to maintain virtual address.
*/
_instruction_reserved_end = ABSOLUTE(.);
_etext = .;
/**
* Similar to _iram_start, this symbol goes here so it is
* resolved by addr2line in preference to the first symbol in
* the flash.text segment.
*/
_flash_cache_start = ABSOLUTE(0);
} > default_code_seg
/**
* Dummy section represents the .flash.text section but in default_rodata_seg.
* Thus, it must have its alignment and (at least) its size.
*/
.flash_rodata_dummy (NOLOAD):
{
_flash_rodata_dummy_start = .;
. = ALIGN(ALIGNOF(.flash.text)) + SIZEOF(.flash.text);
/* Add alignment of MMU page size + 0x20 bytes for the mapping header. */
. = ALIGN(_esp_mmu_page_size) + 0x20;
} > default_rodata_seg
.flash.appdesc : ALIGN(0x10)
{
/**
* Mark flash.rodata start.
* This can be used for mmu driver to maintain virtual address
*/
_rodata_reserved_start = ABSOLUTE(.);
_rodata_start = ABSOLUTE(.);
/* !DO NOT PUT ANYTHING BEFORE THIS! */
/* Should be the first. App version info. */
*(.rodata_desc .rodata_desc.*)
/* Should be the second. Custom app version info. */
*(.rodata_custom_desc .rodata_custom_desc.*)
/**
* Create an empty gap within this section. Thanks to this, the end of this
* section will match .flash.rodata's begin address. Thus, both sections
* will be merged when creating the final bin image.
*/
. = ALIGN(ALIGNOF(.flash.rodata));
} > default_rodata_seg
ASSERT_SECTIONS_GAP(.flash.appdesc, .flash.rodata)
.flash.rodata : ALIGN(0x10)
{
_flash_rodata_start = ABSOLUTE(.);
mapping[flash_rodata]
*(.irom1.text) /* catch stray ICACHE_RODATA_ATTR */
*(.gnu.linkonce.r.*)
*(.rodata1)
*(.gcc_except_table .gcc_except_table.*)
*(.gnu.linkonce.e.*)
/**
* C++ constructor tables.
*
* Excluding crtbegin.o/crtend.o since IDF doesn't use the toolchain crt.
*
* RISC-V gcc is configured with --enable-initfini-array so it emits
* .init_array section instead. But the init_priority sections will be
* sorted for iteration in ascending order during startup.
* The rest of the init_array sections is sorted for iteration in descending
* order during startup, however. Hence a different section is generated for
* the init_priority functions which is iterated in ascending order during
* startup. The corresponding code can be found in startup.c.
*/
ALIGNED_SYMBOL(4, __init_priority_array_start)
KEEP (*(EXCLUDE_FILE (*crtend.* *crtbegin.*) .init_array.*))
__init_priority_array_end = ABSOLUTE(.);
ALIGNED_SYMBOL(4, __init_array_start)
KEEP (*(EXCLUDE_FILE (*crtend.* *crtbegin.*) .init_array))
__init_array_end = ABSOLUTE(.);
/* Addresses of memory regions reserved via SOC_RESERVE_MEMORY_REGION() */
ALIGNED_SYMBOL(4, soc_reserved_memory_region_start)
KEEP (*(.reserved_memory_address))
soc_reserved_memory_region_end = ABSOLUTE(.);
/* System init functions registered via ESP_SYSTEM_INIT_FN */
ALIGNED_SYMBOL(4, _esp_system_init_fn_array_start)
KEEP (*(SORT_BY_INIT_PRIORITY(.esp_system_init_fn.*)))
_esp_system_init_fn_array_end = ABSOLUTE(.);
_rodata_end = ABSOLUTE(.);
. = ALIGN(ALIGNOF(.eh_frame_hdr));
} > default_rodata_seg
ASSERT_SECTIONS_GAP(.flash.rodata, .eh_frame_hdr)
.eh_frame_hdr :
{
#if CONFIG_COMPILER_CXX_EXCEPTIONS || CONFIG_ESP_SYSTEM_USE_EH_FRAME
ALIGNED_SYMBOL(4, __eh_frame_hdr)
KEEP (*(.eh_frame_hdr))
__eh_frame_hdr_end = ABSOLUTE(.);
#endif // CONFIG_COMPILER_CXX_EXCEPTIONS || CONFIG_ESP_SYSTEM_USE_EH_FRAME
. = ALIGN(ALIGNOF(.eh_frame));
} > default_rodata_seg
ASSERT_SECTIONS_GAP(.eh_frame_hdr, .eh_frame)
.eh_frame :
{
#if CONFIG_COMPILER_CXX_EXCEPTIONS || CONFIG_ESP_SYSTEM_USE_EH_FRAME
ALIGNED_SYMBOL(4, __eh_frame)
KEEP (*(.eh_frame))
/**
* As we are not linking with crtend.o, which includes the CIE terminator
* (see __FRAME_END__ in libgcc sources), it is manually provided here.
*/
LONG(0);
__eh_frame_end = ABSOLUTE(.);
#endif // CONFIG_COMPILER_CXX_EXCEPTIONS || CONFIG_ESP_SYSTEM_USE_EH_FRAME
. = ALIGN(ALIGNOF(.flash.tdata));
} > default_rodata_seg
ASSERT_SECTIONS_GAP(.eh_frame, .flash.tdata)
.flash.tdata :
{
_thread_local_data_start = ABSOLUTE(.);
*(.tdata .tdata.* .gnu.linkonce.td.*)
. = ALIGN(ALIGNOF(.flash.tbss));
_thread_local_data_end = ABSOLUTE(.);
} > default_rodata_seg
ASSERT_SECTIONS_GAP(.flash.tdata, .flash.tbss)
.flash.tbss (NOLOAD) :
{
_thread_local_bss_start = ABSOLUTE(.);
*(.tbss .tbss.* .gnu.linkonce.tb.*)
*(.tcommon .tcommon.*)
_thread_local_bss_end = ABSOLUTE(.);
} > default_rodata_seg
/**
* This section contains all the rodata that is not used
* at runtime, helping to avoid an increase in binary size.
*/
.flash.rodata_noload (NOLOAD) :
{
/**
* This symbol marks the end of flash.rodata. It can be utilized by the MMU
* driver to maintain the virtual address.
* NOLOAD rodata may not be included in this section.
*/
_rodata_reserved_end = ADDR(.flash.tbss);
mapping[rodata_noload]
} > default_rodata_seg
/* Marks the end of IRAM code segment */
.iram0.text_end (NOLOAD) :
{
ALIGNED_SYMBOL(4, _iram_text_end)
} > iram0_0_seg
.iram0.data :
{
ALIGNED_SYMBOL(16, _iram_data_start)
mapping[iram0_data]
_iram_data_end = ABSOLUTE(.);
} > iram0_0_seg
.iram0.bss (NOLOAD) :
{
ALIGNED_SYMBOL(16, _iram_bss_start)
mapping[iram0_bss]
_iram_bss_end = ABSOLUTE(.);
} > iram0_0_seg
/**
* This section needs to be placed at the end of the IRAM0, which will be
* released along with dram0_bt_data and dram0_bt_bss when Bluetooth is no
* longer in use.
*/
.iram0.bt.text :
{
ALIGNED_SYMBOL(16, _iram_bt_text_start)
mapping[iram0_bt_text]
ALIGNED_SYMBOL(16, _iram_end)
} > iram0_0_seg
/* Marks the end of data, bss and possibly rodata */
.dram0.heap_start (NOLOAD) :
{
ALIGNED_SYMBOL(16, _heap_start)
} > dram0_0_seg
#include "elf_misc.ld.in"
}
ASSERT(((_iram_end - ORIGIN(iram0_0_seg)) <= LENGTH(iram0_0_seg)),
"IRAM0 segment data does not fit.")
ASSERT(((_heap_start - ORIGIN(dram0_0_seg)) <= LENGTH(dram0_0_seg)),
"DRAM segment data does not fit.")