diff options
Diffstat (limited to 'bsps/powerpc/shared/start/rtems_crti.S')
| -rw-r--r-- | bsps/powerpc/shared/start/rtems_crti.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/bsps/powerpc/shared/start/rtems_crti.S b/bsps/powerpc/shared/start/rtems_crti.S new file mode 100644 index 0000000000..a664ae2522 --- /dev/null +++ b/bsps/powerpc/shared/start/rtems_crti.S @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2017 embedded brains GmbH. All rights reserved. + * + * embedded brains GmbH + * Dornierstr. 4 + * 82178 Puchheim + * Germany + * <rtems@embedded-brains.de> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +/* rtems_crti.S */ +#include <rtems/asm.h> +#include <rtems/score/cpu.h> + +#if defined(__powerpc64__) + .section ".init","ax" + .align 2 + .globl _init + .type _init,@function +_init: + mflr r0 + std r0,16(1) + stdu r1,-96(1) + + .section ".fini","ax" + .align 2 + .globl _fini + .type _fini,@function +_fini: + mflr r0 + std r0,16(r1) + stdu r1,-96(r1) +#else + /* terminate the __init() function and create + * a new head '_init' for use by RTEMS to + * invoke C++ global constructors + * NOTE: it is essential that this snippet + * is hooked between ecrti and crtbegin + * + * ecrti has the following .init section: + * __init: + * stwu r1,-16(r1) + * mflr r0 + * stw r0,20(r1) + * + * The reason for this is that we want to call + * __eabi() at an early stage but prevent __eabi() + * from branching to __init (C++ exception init + * and global CTORs). Hence we make __init a no-op + * and create a new entry point: + */ + .section ".init","ax" + .align 2 + lwz r0,r20(r1) + mtlr r0 + addi r1,r1,16 + blr + .globl _init + .type _init,@function +_init: + stwu r1,-16(r1) + mflr r0 + stw r0,20(r1) +#endif |