Where is source code for startup?

[quevedo]

Hello,

In another post, I mentioned that I am working on very basic code in CW10.4 for the FRDM-KL25 board, to be used on a software lab course for engineering students. Now I am analyszing the startup code, and I have noticed that the first function that is called is "__thumb_startup()", located at __arm_start.c file. This function calls some other functions, named __init_registers(), __init_hardware(), __load_static_base(), __init_pid(), __init_pic(), zero_fill_bss(), __copy_rom_sections_to_ram(), __call_static_initializers(), and __init_user().

I have tried to find the sources for these functions, but so far I could not locate them. Can anyone give me a hint?

One more thing, is there any good reference for position-independent data and relocatable code, related to Kinetis L series, and/or CodeWarrior 10?

Thanks in advance.

[TICS_Fiona]

These funcions are supplied in runtime lib 'librt.a',

Below is extracted in MAP file, from it, we can see that the source code of '__copy_rom_sections_to_ram' is in file 'ROMCopy.c', source code of '__init_registers' is in file '__arm_eabi_init.c'.... The other functions are similar.

These source files which are used to generate 'librt.a' locate at: C:\Freescale\CW MCU v10.4\MCU\ARM_GCC_Support\ewl\EWL_Runtime\src\arm\

------------------------------------------------------------------------------------------------

.text.__copy_rom_section                 0x00001984      0x48 C:/Freescale/CW MCU v10.4/MCU/ARM_GCC_Support/ewl/lib/armv6-m\librt.a(ROMCopy.o)                 0x00001984                __copy_rom_section

.text.__copy_rom_sections_to_ram                 0x000019cc      0x34 C:/Freescale/CW MCU v10.4/MCU/ARM_GCC_Support/ewl/lib/armv6-m\librt.a(ROMCopy.o)                 0x000019cc                __copy_rom_sections_to_ram

.text.__destroy_global_chain                 0x00001a00      0x1c C:/Freescale/CW MCU v10.4/MCU/ARM_GCC_Support/ewl/lib/armv6-m\librt.a(__arm_eabi_init.o)                 0x00001a00                __destroy_global_chain

.text.__init_registers                 0x00001a1c      0x1c C:/Freescale/CW MCU v10.4/MCU/ARM_GCC_Support/ewl/lib/armv6-m\librt.a(__arm_eabi_init.o)                 0x00001a1c                __init_registers

.text.__init_user                 0x00001a38        0x4 C:/Freescale/CW MCU v10.4/MCU/ARM_GCC_Support/ewl/lib/armv6-m\librt.a(__arm_eabi_init.o)                 0x00001a38                __init_user]

------------------------------------------------------------------------------------------------

[quevedo]

Thanks for the answer. Now I just need to locate the source files that generate the runtime library. I want my students to srudy the source codes, so they can see the startup source code. Where would the files like ROMCopu.c and __arm_eabi_init.c be located?

[TICS_Fiona]

Both 'ROMCopu.c' and '__arm_eabi_init.c' are located in:

C:\Freescale\CW MCU v10.4\MCU\ARM_GCC_Support\ewl\EWL_Runtime\src\arm

C:\Freescale\CW MCU v10.4\MCU\ARM_EABI_Support\ewl\EWL_Runtime\Runtime_ARM\Source

[quevedo]

Thanks! That helped a lot!