1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/test/lib-arm/crt0.s	Wed Aug 13 10:32:00 2008 +0000
     1.3 @@ -0,0 +1,59 @@
     1.4 +.section .text
     1.5 +.code 32
     1.6 +.align 	0
     1.7 +.global	start
     1.8 +.global ___exit
     1.9 +.global _atexit
    1.10 +start:
    1.11 +
    1.12 +/* Start by setting up a stack */
    1.13 +	/*  Set up the stack pointer to a fixed value */
    1.14 +	ldr	r3, .LC0
    1.15 +	mov 	sp, r3
    1.16 +	/* Setup a default stack-limit in-case the code has been
    1.17 +	   compiled with "-mapcs-stack-check".  Hard-wiring this value
    1.18 +	   is not ideal, since there is currently no support for
    1.19 +	   checking that the heap and stack have not collided, or that
    1.20 +	   this default 64k is enough for the program being executed.
    1.21 +	   However, it ensures that this simple crt0 world will not
    1.22 +	   immediately cause an overflow event:  */
    1.23 +	sub	sl, sp, #64 << 10	/* Still assumes 256bytes below sl */
    1.24 +
    1.25 +	/* Zero-out the BSS segment */
    1.26 +	mov 	a2, #0			/* Second arg: fill value */
    1.27 +	mov	fp, a2			/* Null frame pointer */
    1.28 +	mov	r7, a2			/* Null frame pointer for Thumb */
    1.29 +	
    1.30 +	ldr	a1, .LC1		/* First arg: start of memory block */
    1.31 +	ldr	a3, .LC2	
    1.32 +	sub	a3, a3, a1		/* Third arg: length of block */
    1.33 +	bl	memset
    1.34 +	b       .LB0
    1.35 +	.word   0		/* padding */
    1.36 +
    1.37 +.syscall:
    1.38 +	.word   -1              /* Syscall # */
    1.39 +	.word   0               /* Arguments */
    1.40 +	.word   0
    1.41 +	.word   0
    1.42 +
    1.43 +	/* Enter main with no arguments for now */
    1.44 +.LB0:
    1.45 +	mov	r0, #0		/*  no arguments  */
    1.46 +	mov	r1, #0		/*  no argv either */
    1.47 +	bl	main
    1.48 +
    1.49 +	bl	exit		/* Should not return */
    1.50 +
    1.51 +	/* For Thumb, constants must be after the code since only 
    1.52 +	positive offsets are supported for PC relative addresses. */
    1.53 +	
    1.54 +	.align 0
    1.55 +.LC0:
    1.56 +	.word   _stack
    1.57 +.LC1:
    1.58 +	.word	__bss_start
    1.59 +.LC2:
    1.60 +	.word	__bss_end
    1.61 +
    1.62 +