/* * 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