diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/start/rtems_crti.S')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/shared/start/rtems_crti.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/start/rtems_crti.S b/c/src/lib/libbsp/powerpc/shared/start/rtems_crti.S new file mode 100644 index 0000000000..0b606663c3 --- /dev/null +++ b/c/src/lib/libbsp/powerpc/shared/start/rtems_crti.S @@ -0,0 +1,35 @@ +/* rtems_crti.S */ +#include <asm.h> +#include <rtems/score/cpu.h> +#include <libcpu/io.h> + + /* 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) |