esp-idf/components/esp_rom/esp32/ld/esp32.rom.syscalls.ld

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/* These ROM functions call respective entries in syscall table.
IDF implementations of these function carry different names
(usually esp_vfs_*) so we still export these functions,
in case some newlib function needs to call them.
I.e.:
open (in ROM) -> _open_r (in ROM) -> syscall table entry _open_r -> esp_vfs_open (in IDF)
*/
PROVIDE ( _close_r = 0x4000bd3c );
PROVIDE ( _exit_r = 0x4000bd28 );
PROVIDE ( _fstat_r = 0x4000bccc );
PROVIDE ( _link_r = 0x4000bc9c );
PROVIDE ( _lseek_r = 0x4000bd8c );
PROVIDE ( _open_r = 0x4000bd54 );
PROVIDE ( _read_r = 0x4000bda8 );
PROVIDE ( _rename_r = 0x4000bc28 );
PROVIDE ( _unlink_r = 0x4000bc84 );
PROVIDE ( _write_r = 0x4000bd70 );
/* These ROM functions call respective entries in the syscall table.
They are called by other ROM functions (mostly from newlib).
We don't link to them directly, since in IDF there are actual
implementations of these functions, with same names.
I.e.:
times (in ROM) -> _times_r (in ROM) -> syscall table entry _times_r -> _times_r (in IDF)
Hence the following entries are provided only for reference
and commented out.
*/
/* <--- the following lines are commented out
PROVIDE ( calloc = 0x4000bee4 );
PROVIDE ( free = 0x4000beb8 );
PROVIDE ( _free_r = 0x4000bbcc );
PROVIDE ( _getpid_r = 0x4000bcfc );
PROVIDE ( __getreent = 0x4000be8c );
PROVIDE ( _gettimeofday_r = 0x4000bc58 );
PROVIDE ( _kill_r = 0x4000bd10 );
PROVIDE ( _lock_acquire = 0x4000be14 );
PROVIDE ( _lock_acquire_recursive = 0x4000be28 );
PROVIDE ( _lock_close = 0x4000bdec );
PROVIDE ( _lock_close_recursive = 0x4000be00 );
PROVIDE ( _lock_init = 0x4000bdc4 );
PROVIDE ( _lock_init_recursive = 0x4000bdd8 );
PROVIDE ( _lock_release = 0x4000be64 );
PROVIDE ( _lock_release_recursive = 0x4000be78 );
PROVIDE ( _lock_try_acquire = 0x4000be3c );
PROVIDE ( _lock_try_acquire_recursive = 0x4000be50 );
PROVIDE ( malloc = 0x4000bea0 );
PROVIDE ( _malloc_r = 0x4000bbb4 );
PROVIDE ( _raise_r = 0x4000bc70 );
PROVIDE ( realloc = 0x4000becc );
PROVIDE ( _realloc_r = 0x4000bbe0 );
PROVIDE ( _sbrk_r = 0x4000bce4 );
PROVIDE ( _system_r = 0x4000bc10 );
PROVIDE ( _times_r = 0x4000bc40 );
---> end commented out block
*/
/* These are the non-reentrant versions of syscalls present in the ROM.
They call the reentrant versions, passing the pointer returned by __getreent
as the first argument.
*/
close = 0x40001778;
open = 0x4000178c;
read = 0x400017dc;
sbrk = 0x400017f4;
times = 0x40001808;
write = 0x4000181c;