newlib-cygwin/libgloss/arm/linux-crt0.S

47 lines
850 B
ArmAsm

/** Linux startup code for the ARM processor.
* Written by Shaun Jackman <sjackman@gmail.com>.
* Copyright 2006 Pathway Connectivity
*
* Permission to use, copy, modify, and distribute this software
* is freely granted, provided that this notice is preserved.
*/
.global _start
.type _start, %function
_start:
#if __thumb__
/* Switch to Thumb mode. */
adr r0, _start_thumb+1
bx r0
.size _start, .-_start
.global _start_thumb
.thumb_func
_start_thumb:
#endif
#if 0
/* Clear the BSS. This task is normally handled by the kernel. */
ldr r0, =__bss_start
mov r1, #0
ldr r2, =_end
sub r2, r2, r0
bl memset
#endif
pop {r0} @ argc
mov r1, sp @ argv
lsl r2, r0, #2
add r2, r1
add r2, #4 @ envp
ldr r3, =environ
str r2, [r3]
bl main
bl exit
b .
#if __thumb__
.size _start_thumb, .-_start_thumb
#else
.size _start, .-_start
#endif