2009-01-14 15:26:47 -06:00
|
|
|
/* Sample initialization file */
|
|
|
|
|
|
|
|
|
|
.extern main
|
|
|
|
|
.extern exit
|
|
|
|
|
|
|
|
|
|
/* .text is used instead of .section .text so it works with arm-aout too. */
|
|
|
|
|
.text
|
|
|
|
|
.code 32
|
|
|
|
|
.align 0
|
|
|
|
|
|
|
|
|
|
.global _mainCRTStartup
|
|
|
|
|
.global _start
|
|
|
|
|
.global start
|
|
|
|
|
start:
|
|
|
|
|
_start:
|
|
|
|
|
_mainCRTStartup:
|
|
|
|
|
|
|
|
|
|
/* Start by setting up a stack */
|
|
|
|
|
/* Set up the stack pointer to end of bss */
|
|
|
|
|
ldr r3, .LC2
|
|
|
|
|
mov sp, r3
|
|
|
|
|
|
|
|
|
|
sub sl, sp, #512 /* Still assumes 512 bytes below sl */
|
|
|
|
|
|
|
|
|
|
mov a2, #0 /* Second arg: fill value */
|
|
|
|
|
mov fp, a2 /* Null frame pointer */
|
|
|
|
|
mov r7, a2 /* Null frame pointer for Thumb */
|
|
|
|
|
|
|
|
|
|
ldr a1, .LC1 /* First arg: start of memory block */
|
|
|
|
|
ldr a3, .LC2 /* Second arg: end of memory block */
|
|
|
|
|
sub a3, a3, a1 /* Third arg: length of block */
|
|
|
|
|
|
|
|
|
|
mov r0, #0 /* no arguments */
|
|
|
|
|
mov r1, #0 /* no argv either */
|
|
|
|
|
|
|
|
|
|
bl main
|
|
|
|
|
bl exit /* Should not return */
|
|
|
|
|
|
|
|
|
|
/* For Thumb, constants must be after the code since only
|
|
|
|
|
positive offsets are supported for PC relative addresses. */
|
|
|
|
|
|
|
|
|
|
.align 0
|
|
|
|
|
.LC1:
|
|
|
|
|
.word __bss_start__
|
|
|
|
|
.LC2:
|
|
|
|
|
.word __bss_end__
|
