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fix(esp_system): xtensa: refactor linker scripts and reduce binary size for C++ apps

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This commit is contained in:
Alexey Lapshin
2026-01-30 23:27:32 +07:00
parent 9f1359ad08
commit f28a2765d8
9 changed files with 221 additions and 318 deletions
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components/esp_system/ld/esp32s3/memory.ld.in
-3
View File
@@ -185,9 +185,6 @@ _heap_start = _heap_low_start;
/* Heap ends at top of dram0_0_seg */
_heap_end = 0x40000000;
_data_seg_org = ORIGIN(rtc_data_seg);
/* RTC fast memory shares the same range for both data and instructions */
REGION_ALIAS("rtc_data_seg", rtc_iram_seg );
components/esp_system/ld/esp32s3/sections.ld.in
+58 -97
View File
@@ -24,11 +24,7 @@ SECTIONS
*(.rtc.entry.literal .rtc.entry.text)
mapping[rtc_text]
/* mutable libs begin */
mutable[rtc_text]
/* mutable libs end */
SECTION_MAPPINGS(rtc_text)
*rtc_wake_stub*.*(.literal .text .literal.* .text.*)
*(.rtc_text_end_test)
@@ -51,11 +47,7 @@ SECTIONS
{
ALIGNED_SYMBOL(4, _rtc_force_fast_start)
mapping[rtc_force_fast]
/* mutable libs begin */
mutable[rtc_force_fast]
/* mutable libs end */
SECTION_MAPPINGS(rtc_force_fast)
*(.rtc.force_fast .rtc.force_fast.*)
@@ -74,11 +66,7 @@ SECTIONS
{
_rtc_data_start = ABSOLUTE(.);
mapping[rtc_data]
/* mutable libs begin */
mutable[rtc_data]
/* mutable libs end */
SECTION_MAPPINGS(rtc_data)
*rtc_wake_stub*.*(.data .rodata .data.* .rodata.*)
@@ -93,11 +81,7 @@ SECTIONS
*rtc_wake_stub*.*(.bss .bss.*)
*rtc_wake_stub*.*(COMMON)
mapping[rtc_bss]
/* mutable libs begin */
mutable[rtc_bss]
/* mutable libs end */
SECTION_MAPPINGS(rtc_bss)
_rtc_bss_end = ABSOLUTE(.);
} > rtc_data_location
@@ -114,7 +98,7 @@ SECTIONS
{
ALIGNED_SYMBOL(4, _rtc_noinit_start)
mapping[rtc_noinit]
SECTION_MAPPINGS(rtc_noinit)
*(.rtc_noinit .rtc_noinit.*)
@@ -213,13 +197,7 @@ SECTIONS
/* Code marked as running out of IRAM */
_iram_text_start = ABSOLUTE(.);
mapping[iram0_text]
/* mutable libs begin */
mutable[iram0_text]
FAST_REFLASHING_PADDING;
/* mutable libs end */
SECTION_MAPPINGS_WITH_PADDING(iram0_text)
} > iram0_0_seg
/**
@@ -228,8 +206,7 @@ SECTIONS
*/
.dram0.dummy (NOLOAD):
{
/* MAX() uses unsigned long arithmetic. Add offset to prevent underflow when _iram_end < _diram_i_start */
. = ORIGIN(dram0_0_seg) + MAX(_iram_end - _diram_i_start + (_diram_i_start - ORIGIN(iram0_0_seg)), (_diram_i_start - ORIGIN(iram0_0_seg))) - (_diram_i_start - ORIGIN(iram0_0_seg));
. = ORIGIN(dram0_0_seg) + ((_iram_end > _diram_i_start) ? (_iram_end - _diram_i_start) : 0);
} > dram0_0_seg
.dram0.data :
@@ -243,12 +220,7 @@ SECTIONS
*(.gnu.linkonce.s2.*)
*(.jcr)
mapping[dram0_data]
/* mutable libs begin */
mutable[dram0_data]
FAST_REFLASHING_PADDING;
/* mutable libs end */
SECTION_MAPPINGS_WITH_PADDING(dram0_data)
_data_end = ABSOLUTE(.);
} > dram0_0_seg
@@ -273,15 +245,7 @@ SECTIONS
{
ALIGNED_SYMBOL(8, _bss_start)
/**
* ldgen places all bss-related data to mapping[dram0_bss]
* (See components/esp_system/app.lf).
*/
mapping[dram0_bss]
/* mutable libs begin */
mutable[dram0_bss]
/* mutable libs end */
SECTION_MAPPINGS(dram0_bss)
ALIGNED_SYMBOL(8, _bss_end)
} > dram0_0_seg
@@ -299,12 +263,7 @@ SECTIONS
_instruction_reserved_start = ABSOLUTE(.);
_text_start = ABSOLUTE(.);
mapping[flash_text]
/* mutable libs begin */
mutable[flash_text]
FAST_REFLASHING_PADDING;
/* mutable libs end */
SECTION_MAPPINGS_WITH_PADDING(flash_text)
*(.stub)
*(.gnu.warning)
@@ -378,7 +337,7 @@ SECTIONS
{
_flash_rodata_start = ABSOLUTE(.);
mapping[flash_rodata]
SECTION_MAPPINGS_WITH_PADDING(flash_rodata)
*(.irom1.text) /* catch stray ICACHE_RODATA_ATTR */
*(.gnu.linkonce.r.*)
@@ -396,16 +355,6 @@ SECTIONS
__XT_EXCEPTION_DESCS_END__ = ABSOLUTE(.);
*(.xt_except_desc_end)
#if EH_FRAME_LINKING_ENABLED
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);
#endif // EH_FRAME_LINKING_ENABLED
/**
* C++ constructor tables.
*
@@ -431,11 +380,6 @@ SECTIONS
KEEP (*(SORT_BY_INIT_PRIORITY(.esp_system_init_fn.*)))
_esp_system_init_fn_array_end = ABSOLUTE(.);
/* mutable libs begin */
mutable[flash_rodata]
FAST_REFLASHING_PADDING;
/* mutable libs end */
_rodata_end = ABSOLUTE(.);
/* Literals are also RO data. */
@@ -444,9 +388,37 @@ SECTIONS
*(.lit4.*)
*(.gnu.linkonce.lit4.*)
_lit4_end = ABSOLUTE(.);
. = ALIGN(ALIGNOF(SECTION_AFTER_FLASH_RODATA));
} > default_rodata_seg
ASSERT_SECTIONS_GAP(.flash.rodata, SECTION_AFTER_FLASH_RODATA)
/* TLS data. */
ALIGNED_SYMBOL(4, _thread_local_start)
#if EH_FRAME_LINKING_ENABLED
.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(.);
. = ALIGN(ALIGNOF(.flash.tdata));
} > default_rodata_seg
#endif // EH_FRAME_LINKING_ENABLED
.flash.tdata :
{
/* Keep tdata and tbss sections contiguous (no gaps between them).
* The TLS runtime code calculates offsets assuming these sections are
* adjacent. Gaps would cause incorrect address calculations, leading
* to accessing wrong memory.
*/
/* tdata sections */
_thread_local_data_start = ABSOLUTE(.);
#if CONFIG_LIBC_PICOLIBC
_picolibc_reent_stub_start = ABSOLUTE(.);
KEEP(*(.tdata.errno))
@@ -458,15 +430,18 @@ SECTIONS
#endif // CONFIG_LIBC_PICOLIBC_NEWLIB_COMPATIBILITY
_picolibc_reent_stub_end = ABSOLUTE(.);
#endif // CONFIG_LIBC_PICOLIBC
*(.tdata)
*(.tdata.*)
*(.tbss)
*(.tbss.*)
_thread_local_end = ABSOLUTE(.);
*(.tdata .tdata.* .gnu.linkonce.td.*)
_thread_local_data_end = ABSOLUTE(.);
/* tbss sections */
_thread_local_bss_start = ABSOLUTE(.);
*(.tbss .tbss.* .gnu.linkonce.tb.*)
*(.tcommon .tcommon.*)
_thread_local_bss_end = ABSOLUTE(.);
} > default_rodata_seg
_tls_section_alignment = ALIGNOF(.flash.tdata);
ASSERT_PICOLIBC_REENT_STUB()
_flash_rodata_align = ALIGNOF(.flash.rodata);
ASSERT(_thread_local_data_end == _thread_local_bss_start,
"tdata and tbss must be contiguous.")
/**
* This section contains all the rodata that is not used
@@ -481,11 +456,7 @@ SECTIONS
*/
_rodata_reserved_end = ABSOLUTE(.);
mapping[rodata_noload]
/* mutable libs begin */
mutable[rodata_noload]
/* mutable libs end */
SECTION_MAPPINGS(rodata_noload)
} > default_rodata_seg
/**
@@ -505,11 +476,7 @@ SECTIONS
{
_ext_ram_bss_start = ABSOLUTE(.);
mapping[extern_ram]
/* mutable libs begin */
mutable[extern_ram]
/* mutable libs end */
SECTION_MAPPINGS(extern_ram)
ALIGNED_SYMBOL(4, _ext_ram_bss_end)
} > extern_ram_seg
@@ -524,6 +491,7 @@ SECTIONS
{
_ext_ram_noinit_start = ABSOLUTE(.);
SECTION_MAPPINGS(extram_noinit)
*(.ext_ram_noinit*)
ALIGNED_SYMBOL(4, _ext_ram_noinit_end)
@@ -547,11 +515,7 @@ SECTIONS
{
ALIGNED_SYMBOL(4, _iram_data_start)
mapping[iram0_data]
/* mutable libs begin */
mutable[iram0_data]
/* mutable libs end */
SECTION_MAPPINGS(iram0_data)
ALIGNED_SYMBOL(4, _iram_data_end)
} > iram0_0_seg
@@ -560,11 +524,7 @@ SECTIONS
{
ALIGNED_SYMBOL(4, _iram_bss_start)
mapping[iram0_bss]
/* mutable libs begin */
mutable[iram0_bss]
/* mutable libs end */
SECTION_MAPPINGS(iram0_bss)
_iram_bss_end = ABSOLUTE(.);
ALIGNED_SYMBOL(4, _iram_end)
@@ -577,7 +537,8 @@ SECTIONS
ALIGNED_SYMBOL(8, _heap_low_start)
} > dram0_0_seg
#include "elf_misc.ld.in"
#include "ld.debug.sections"
#include "ld.discard.sections"
}
ASSERT(((_iram_end - ORIGIN(iram0_0_seg)) <= LENGTH(iram0_0_seg)),