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esp-idf/components/esp_system/ld/esp32c3/sections.ld.in

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/*
* SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/* Default entry point */
ENTRY(call_start_cpu0);
SECTIONS
{
/**
* RTC fast memory holds RTC wake stub code,
* including from any source file named rtc_wake_stub*.c
*/
.rtc.text :
{
. = ALIGN(4);
_rtc_fast_start = ABSOLUTE(.);
mapping[rtc_text]
*rtc_wake_stub*.*(.literal .text .literal.* .text.*)
*(.rtc_text_end_test)
/* 16B padding for possible CPU prefetch and 4B alignment for PMS split lines */
. += _esp_memprot_prefetch_pad_size;
. = ALIGN(4);
_rtc_text_end = ABSOLUTE(.);
} > rtc_iram_seg
/**
* This section located in RTC FAST Memory area.
* It holds data marked with RTC_FAST_ATTR attribute.
* See the file "esp_attr.h" for more information.
*/
.rtc.force_fast :
{
. = ALIGN(4);
_rtc_force_fast_start = ABSOLUTE(.);
mapping[rtc_force_fast]
*(.rtc.force_fast .rtc.force_fast.*)
. = ALIGN(4) ;
_rtc_force_fast_end = ABSOLUTE(.);
} > rtc_data_seg
/**
* RTC data section holds RTC wake stub
* data/rodata, including from any source file
* named rtc_wake_stub*.c and the data marked with
* RTC_DATA_ATTR, RTC_RODATA_ATTR attributes.
*/
.rtc.data :
{
_rtc_data_start = ABSOLUTE(.);
mapping[rtc_data]
*rtc_wake_stub*.*(.data .rodata .data.* .rodata.* .srodata.*)
_rtc_data_end = ABSOLUTE(.);
} > rtc_data_location
/* RTC bss, from any source file named rtc_wake_stub*.c */
.rtc.bss (NOLOAD) :
{
_rtc_bss_start = ABSOLUTE(.);
*rtc_wake_stub*.*(.bss .bss.* .sbss .sbss.*)
*rtc_wake_stub*.*(COMMON)
mapping[rtc_bss]
_rtc_bss_end = ABSOLUTE(.);
} > rtc_data_location
/**
* This section holds data that should not be initialized at power up
* and will be retained during deep sleep.
* User data marked with RTC_NOINIT_ATTR will be placed
* into this section. See the file "esp_attr.h" for more information.
*/
.rtc_noinit (NOLOAD):
{
. = ALIGN(4);
_rtc_noinit_start = ABSOLUTE(.);
*(.rtc_noinit .rtc_noinit.*)
. = ALIGN(4) ;
_rtc_noinit_end = ABSOLUTE(.);
} > rtc_data_location
/**
* This section located in RTC SLOW Memory area.
* It holds data marked with RTC_SLOW_ATTR attribute.
* See the file "esp_attr.h" for more information.
*/
.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
/**
* This section holds RTC data that should have fixed addresses.
* The data are not initialized at power-up and are retained during deep sleep.
*/
.rtc_reserved (NOLOAD):
{
. = ALIGN(4);
_rtc_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.*)
KEEP(*(.bootloader_data_rtc_mem .bootloader_data_rtc_mem.*))
_rtc_reserved_end = ABSOLUTE(.);
} > rtc_reserved_seg
_rtc_reserved_length = _rtc_reserved_end - _rtc_reserved_start;
ASSERT((_rtc_reserved_length <= LENGTH(rtc_reserved_seg)),
"RTC reserved segment data does not fit.")
/* Get size of rtc slow data based on rtc_data_location alias */
_rtc_slow_length = (ORIGIN(rtc_slow_seg) == ORIGIN(rtc_data_location))
? (_rtc_force_slow_end - _rtc_data_start)
: (_rtc_force_slow_end - _rtc_force_slow_start);
_rtc_fast_length = (ORIGIN(rtc_slow_seg) == ORIGIN(rtc_data_location))
? (_rtc_force_fast_end - _rtc_fast_start)
: (_rtc_noinit_end - _rtc_fast_start);
ASSERT((_rtc_slow_length <= LENGTH(rtc_slow_seg)),
"RTC_SLOW segment data does not fit.")
ASSERT((_rtc_fast_length <= LENGTH(rtc_data_seg)),
"RTC_FAST segment data does not fit.")
.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));
. = ALIGN(4);
_invalid_pc_placeholder = ABSOLUTE(.);
/* 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
.dram0.data :
{
_data_start = ABSOLUTE(.);
*(.gnu.linkonce.d.*)
*(.data1)
__global_pointer$ = . + 0x800;
*(.sdata)
*(.sdata.*)
*(.gnu.linkonce.s.*)
*(.gnu.linkonce.s2.*)
*(.jcr)
mapping[dram0_data]
_data_end = ABSOLUTE(.);
. = ALIGN(4);
} > 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):
{
. = ALIGN(4);
_noinit_start = ABSOLUTE(.);
*(.noinit .noinit.*)
. = ALIGN(4) ;
_noinit_end = ABSOLUTE(.);
} > dram0_0_seg
/* Shared RAM */
.dram0.bss (NOLOAD) :
{
. = ALIGN (8);
_bss_start = ABSOLUTE(.);
mapping[dram0_bss]
*(.dynsbss)
*(.sbss)
*(.sbss.*)
*(.gnu.linkonce.sb.*)
*(.scommon)
*(.sbss2)
*(.sbss2.*)
*(.gnu.linkonce.sb2.*)
*(.dynbss)
*(.share.mem)
*(.gnu.linkonce.b.*)
. = ALIGN (8);
_bss_end = ABSOLUTE(.);
} > dram0_0_seg
ASSERT(((_bss_end - ORIGIN(dram0_0_seg)) <= LENGTH(dram0_0_seg)), "DRAM segment data does not fit.")
.flash.text :
{
_stext = .;
_instruction_reserved_start = ABSOLUTE(.); /* This is a symbol marking the flash.text start, this can be used for mmu driver to maintain virtual address */
_text_start = ABSOLUTE(.);
mapping[flash_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)
/** 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(.);
_instruction_reserved_end = ABSOLUTE(.); /* This is a symbol marking the flash.text end, this can be used for mmu driver to maintain virtual address */
_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
/**
* This 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 = .;
/* Start at the same alignment constraint than .flash.text */
. = ALIGN(ALIGNOF(.flash.text));
/* Create an empty gap as big as .flash.text section */
. = . + SIZEOF(.flash.text);
/* Prepare the alignment of the section above. Few bytes (0x20) must be
* added for the mapping header. */
. = ALIGN(_esp_mmu_block_size) + 0x20;
} > default_rodata_seg
.flash.appdesc : ALIGN(0x10)
{
_rodata_reserved_start = ABSOLUTE(.); /* This is a symbol marking the flash.rodata start, this can be used for mmu driver to maintain virtual address */
_rodata_start = ABSOLUTE(.);
*(.rodata_desc .rodata_desc.*) /* Should be the first. App version info. DO NOT PUT ANYTHING BEFORE IT! */
*(.rodata_custom_desc .rodata_custom_desc.*) /* Should be the second. Custom app version info. DO NOT PUT ANYTHING BEFORE IT! */
/* 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
.flash.rodata : ALIGN(0x10)
{
_flash_rodata_start = ABSOLUTE(.);
mapping[flash_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)
. = (. + 7) & ~ 3;
/*
* C++ constructor and destructor tables
* Don't include anything from crtbegin.o or crtend.o, as IDF doesn't use toolchain crt.
*
* RISC-V gcc is configured with --enable-initfini-array so it emits an .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.
*/
__init_priority_array_start = ABSOLUTE(.);
KEEP (*(EXCLUDE_FILE (*crtend.* *crtbegin.*) .init_array.*))
__init_priority_array_end = ABSOLUTE(.);
__init_array_start = ABSOLUTE(.);
KEEP (*(EXCLUDE_FILE (*crtend.* *crtbegin.*) .init_array))
__init_array_end = ABSOLUTE(.);
KEEP (*crtbegin.*(.dtors))
KEEP (*(EXCLUDE_FILE (*crtend.*) .dtors))
KEEP (*(SORT(.dtors.*)))
KEEP (*(.dtors))
/* 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)
/* Addresses of memory regions reserved via SOC_RESERVE_MEMORY_REGION() */
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 */
_esp_system_init_fn_array_start = ABSOLUTE(.);
KEEP (*(SORT_BY_INIT_PRIORITY(.esp_system_init_fn.*)))
_esp_system_init_fn_array_end = ABSOLUTE(.);
_rodata_end = ABSOLUTE(.);
/* Literals are also RO data. */
_lit4_start = ABSOLUTE(.);
*(*.lit4)
*(.lit4.*)
*(.gnu.linkonce.lit4.*)
_lit4_end = ABSOLUTE(.);
. = ALIGN(4);
_thread_local_start = ABSOLUTE(.);
*(.tdata)
*(.tdata.*)
*(.tbss)
*(.tbss.*)
_thread_local_end = ABSOLUTE(.);
. = ALIGN(ALIGNOF(.eh_frame));
} > default_rodata_seg
/* Keep this section shall be at least aligned on 4 */
.eh_frame : ALIGN(8)
{
__eh_frame = ABSOLUTE(.);
KEEP (*(.eh_frame))
__eh_frame_end = ABSOLUTE(.);
/* Guarantee that this section and the next one will be merged by making
* them adjacent. */
. = ALIGN(ALIGNOF(.eh_frame_hdr));
} > default_rodata_seg
/* To avoid any exception in C++ exception frame unwinding code, this section
* shall be aligned on 8. */
.eh_frame_hdr : ALIGN(8)
{
__eh_frame_hdr = ABSOLUTE(.);
KEEP (*(.eh_frame_hdr))
__eh_frame_hdr_end = ABSOLUTE(.);
} > default_rodata_seg
/*
This section is a place where we dump all the rodata which aren't used at runtime,
so as to avoid binary size increase
*/
.flash.rodata_noload (NOLOAD) :
{
/*
This is a symbol marking the flash.rodata end, this can be used for mmu driver to maintain virtual address
We don't need to include the noload rodata in this section
*/
_rodata_reserved_end = ABSOLUTE(.);
. = ALIGN (4);
mapping[rodata_noload]
} > default_rodata_seg
/* Marks the end of IRAM code segment */
.iram0.text_end (NOLOAD) :
{
/* iram_end_test section exists for use by Memprot unit tests only */
*(.iram_end_test)
/* ESP32-C3 memprot requires 16B padding for possible CPU prefetch and 512B alignment for PMS split lines */
. += _esp_memprot_prefetch_pad_size;
. = ALIGN(_esp_memprot_align_size);
_iram_text_end = ABSOLUTE(.);
} > iram0_0_seg
.iram0.data :
{
. = ALIGN(16);
_iram_data_start = ABSOLUTE(.);
mapping[iram0_data]
_iram_data_end = ABSOLUTE(.);
} > iram0_0_seg
.iram0.bss (NOLOAD) :
{
. = ALIGN(16);
_iram_bss_start = ABSOLUTE(.);
mapping[iram0_bss]
_iram_bss_end = ABSOLUTE(.);
. = ALIGN(16);
_iram_end = ABSOLUTE(.);
} > iram0_0_seg
/* Marks the end of data, bss and possibly rodata */
.dram0.heap_start (NOLOAD) :
{
. = ALIGN (16);
_heap_start = ABSOLUTE(.);
} > dram0_0_seg
}
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.")
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