Redefining the startup procedure

By defining _reset_vector__ in the user application, the linker will not link standard startup code. For example:

#include <io.h>

NAKED(_reset_vector__)
{
	/* place your startup code here */

	/* Make shure, the branch to main (or to your start
	   routine) is the last line in the function */
	__asm__ __volatile__("br #main"::);
}

a.out:     file format elf32-msp430

Disassembly of section .text:

0000fc00 <__zero_vector>:
    fc00:       30 40 04 fc     br      #0xfc04

0000fc04 <_unexpected_>:
    fc04:       00 13           reti

0000fc06 <_reset_vector__>:
    fc06:       00 3c           jmp     $+2             ;  abs dst addr 0xfc08

0000fc08 <main>:
    fc08:       31 40 80 02     mov     #640,   SP      ;  #0x0280
    fc0c:       30 40 10 fc     br      #0xfc10

0000fc10 <__stop_progExec__>:
    fc10:       02 43           clr     SR
    fc12:       fe 3f           jmp     $-2             ;  abs dst addr 0xfc10
Disassembly of section .data:
Disassembly of section .vectors:
[skip]

Another way to define the reset routine is to use the _RESET() macro:

_RESET()
{
	/* place your startup code here */
	__asm__ __volatile__("br #main"::);
}