esp32s3/elf: Enable ELF loader for ESP32-S3

Provide `up_copy_section` function that enables copying data using
the data bus. If the memory destination address is accessible
through the instruction bus, the data is copied using the
correspondent address accessible through the data bus.

Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.rst

@@ -174,7 +174,6 @@ disables the NuttShell to get the best possible score.
 
 cxx
 ---
-
 Development environment ready for C++ applications. You can check if the setup
 was successful by running ``cxxtest``::
 
@@ -197,6 +196,12 @@ was successful by running ``cxxtest``::
     Invalid file! /invalid
     File /proc/version exists!
 
+elf
+---
+
+This configuration uses apps/examples/elf in order to test the ELF loader.
+It can be tested by executing the ``elf`` application.
+
 gpio
 ----
 

arch/xtensa/Kconfig

@@ -79,6 +79,7 @@ config ARCH_CHIP_ESP32S3
 	select ARCH_FAMILY_LX7
 	select XTENSA_HAVE_INTERRUPTS
 	select ARCH_HAVE_BOOTLOADER if !ESPRESSIF_SIMPLE_BOOT
+	select ARCH_HAVE_COPY_SECTION
 	select ARCH_HAVE_FPU
 	select ARCH_HAVE_MPU
 	select ARCH_HAVE_MULTICPU

arch/xtensa/src/esp32s3/esp32s3_textheap.c

@@ -231,3 +231,23 @@ IRAM_ATTR void up_textheap_data_sync(void)
 
   leave_critical_section(flags);
 }
+
+/****************************************************************************
+ * Name: up_copy_section
+ *
+ * Description:
+ *   Copy section from general temporary buffer(src) to special addr(dest).
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_ARCH_USE_COPY_SECTION)
+int up_copy_section(FAR void *dest, FAR const void *src, size_t n)
+{
+  memcpy(up_textheap_data_address(dest), src, n);
+
+  return OK;
+}
+#endif

boards/xtensa/esp32s3/esp32s3-devkit/configs/elf/defconfig

@@ -0,0 +1,62 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_LEDS is not set
+# CONFIG_NDEBUG is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ARCH="xtensa"
+CONFIG_ARCH_BOARD="esp32s3-devkit"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32S3_DEVKIT=y
+CONFIG_ARCH_CHIP="esp32s3"
+CONFIG_ARCH_CHIP_ESP32S3=y
+CONFIG_ARCH_CHIP_ESP32S3WROOM1N4=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARCH_USE_COPY_SECTION=y
+CONFIG_ARCH_XTENSA=y
+CONFIG_BINFMT_CONSTRUCTORS=y
+CONFIG_BOARDCTL_ROMDISK=y
+CONFIG_BOARD_LOOPSPERMSEC=16717
+CONFIG_BUILTIN=y
+CONFIG_ELF=y
+CONFIG_ESP32S3_UART0=y
+CONFIG_EXAMPLES_ELF=y
+CONFIG_EXECFUNCS_HAVE_SYMTAB=y
+CONFIG_EXECFUNCS_SYSTEM_SYMTAB=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_ROMFS=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_IDLETHREAD_STACKSIZE=3072
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_PERROR_STDOUT=y
+CONFIG_LIBC_STRERROR=y
+CONFIG_LIBC_STRERROR_ERRNUM=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=114688
+CONFIG_RAM_START=0x20000000
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_HPWORK=y
+CONFIG_SCHED_LPWORK=y
+CONFIG_SCHED_STARTHOOK=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=6
+CONFIG_START_MONTH=12
+CONFIG_START_YEAR=2011
+CONFIG_SYMTAB_ORDEREDBYNAME=y
+CONFIG_SYSLOG_BUFFER=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TLS_NELEM=4
+CONFIG_UART0_SERIAL_CONSOLE=y