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/*
* crt0 for VAX
*/
/*
* Program stack looks like:
* sp-> argc argument counter (integer)
* argv[0] program name (pointer)
* argv[1...N] program args (pointers)
* argv[argc-1] end of args (integer)
* NULL
* env[0...N] environment variables (pointers)
* NULL
*/
#include <features.h>
.text
.align 4
.global __start
__start:
.global _start
_start:
/* Kernel uses a_interp + 2, so __start isn't exactly CALLSed, */
/* but we need to have two bytes here, so we use NOPs. This */
/* won't hurt, though R0 would be invalid to push, but at */
/* lease this looks like a real function. */
.word 0x0101
movl $0, %fp /* FP = 0, since this is the */
/* top-most stack frame */
movl %sp, %r0 /* R0 = %sp */
movl (%sp)+, %r4 /* R4 = argc */
movl %sp, %r3 /* R3 = argv = &argv[0] */
#if (defined L_crt1 || defined L_gcrt1) && defined __UCLIBC_CTOR_DTOR__
pushl %r0 /* stack_end */
pushl $0 /* rtld_fini. This is probably needed for the */
/* case where a dynamic linker is involved. So */
/* this is an open FIXME that needs to be */
/* addressed at some time... */
pushl $_fini
pushl $_init
pushl %r3 /* Argument pointer */
pushl %r4 /* And the argument count */
pushl $main /* main() */
/* We need to call __uClibc_main which should not return.
* __uClibc_main (int (*main) (int, char **, char **),
* int argc,
* char **argv,
* void (*init) (void),
* void (*fini) (void),
* void (*rtld_fini) (void),
* void *stack_end);
*/
calls $7, __uClibc_main
#else /* FIXME: THIS IS BROKEN!!! */
/* start to load the arguments from the stack */
/* arguments are on ap stack */
pushl %r2
pushl %r3
pushl %r4
calls $3, __uClibc_main
#endif
/* The above __uClibc_start_main() shouldn't ever return. If it */
/* does, we just crash. */
halt
.align 2
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