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feat(esp_libc): add full support for picolibc

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This commit is contained in:
Alexey Lapshin
2026-01-30 23:39:53 +07:00
parent 1c08b38b27
commit 0b3929d0d9
82 changed files with 934 additions and 382 deletions
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components/esp_system/ld/esp32c61/sections.ld.in
+33 -15
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@@ -204,6 +204,9 @@ SECTIONS
mapping[flash_rodata]
#if CONFIG_LIBC_PICOLIBC
*(.got .got.plt) /* TODO: GCC-439 */
#endif
*(.irom1.text) /* catch stray ICACHE_RODATA_ATTR */
*(.gnu.linkonce.r.*)
*(.rodata1)
@@ -278,32 +281,41 @@ SECTIONS
.flash.tdata :
{
_thread_local_data_start = ABSOLUTE(.);
*(.tdata .tdata.* .gnu.linkonce.td.*)
. = ALIGN(ALIGNOF(.flash.tbss));
#if CONFIG_SPIRAM_RODATA && CONFIG_SPIRAM_PRE_CONFIGURE_MEMORY_PROTECTION
/* Align the end of flash rodata region as per PMP granularity to allow using the
* page alignment gap created while mapping the flash region into the PSRAM memory.
/* 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.
*/
. = ALIGN(_esp_pmp_align_size);
#endif // CONFIG_SPIRAM_RODATA && CONFIG_SPIRAM_PRE_CONFIGURE_MEMORY_PROTECTION
/* tdata sections */
_thread_local_data_start = ABSOLUTE(.);
#if CONFIG_LIBC_PICOLIBC
_picolibc_reent_stub_start = ABSOLUTE(.);
KEEP(*(.tdata.errno))
#if CONFIG_LIBC_PICOLIBC_NEWLIB_COMPATIBILITY
/* Reproduce the public fields from struct _reent. */
KEEP(*(.tdata.tls_stdin))
KEEP(*(.tdata.tls_stdout))
KEEP(*(.tdata.tls_stderr))
#endif // CONFIG_LIBC_PICOLIBC_NEWLIB_COMPATIBILITY
_picolibc_reent_stub_end = ABSOLUTE(.);
#endif // CONFIG_LIBC_PICOLIBC
*(.tdata .tdata.* .gnu.linkonce.td.*)
. = ALIGN(ALIGNOF(.flash.tbss));
_thread_local_data_end = ABSOLUTE(.);
} > default_rodata_seg
ASSERT_SECTIONS_GAP(.flash.tdata, .flash.tbss)
ASSERT_PICOLIBC_REENT_STUB()
.flash.tbss (NOLOAD) :
{
/* tbss sections */
_thread_local_bss_start = ABSOLUTE(.);
*(.tbss .tbss.* .gnu.linkonce.tb.*)
*(.tcommon .tcommon.*)
_thread_local_bss_end = ABSOLUTE(.);
} > default_rodata_seg
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
@@ -311,12 +323,18 @@ SECTIONS
*/
.flash.rodata_noload (NOLOAD) :
{
#if CONFIG_SPIRAM_RODATA && CONFIG_SPIRAM_PRE_CONFIGURE_MEMORY_PROTECTION
/* Align the end of flash rodata region as per PMP granularity to allow using the
* page alignment gap created while mapping the flash region into the PSRAM memory.
*/
. = ALIGN(_esp_pmp_align_size);
#endif // CONFIG_SPIRAM_RODATA && CONFIG_SPIRAM_PRE_CONFIGURE_MEMORY_PROTECTION
/**
* 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);
_rodata_reserved_end = .;
mapping[rodata_noload]
} > default_rodata_seg