Subversion Repositories or1k

extern int main(int argc, char **argv, char **envp);

extern int brk (void *value);

extern char bss_start;

extern char end;

char *__env[1] = {0};

char **environ = __env;

#define ENABLE_TRACE_MASK 1

__inline static void

enable_tracing (void)

{

    register int mask = ENABLE_TRACE_MASK;

    __asm__ volatile ("modpc %0,%0,%0"

                      :

                      : "d" (mask));

}

#define STACK_ALIGN 64

__inline static void

set_stack (void* ptr)

{

    ptr = (void *)(((int)ptr + STACK_ALIGN - 1) & ~(STACK_ALIGN - 1));

    /* SP must be 64 bytes larger than FP at start.  */

    __asm__ volatile ("mov %0,sp"

                      :

                      : "d" (ptr+STACK_ALIGN));

    __asm__ volatile ("mov %0,fp"

                      :

                      : "d" (ptr));

}

__inline static void

init_Cregs (void)

{

    /* set register values gcc like */

    register unsigned int mask0=0x3b001000;

    register unsigned int mask1=0x00009107;

    __asm__ volatile ("mov   %0,g14"

                      :                      /* no output */

                      : "I" (0));            /* gnu structure pointer */

    __asm__ volatile ("modac %1,%0,%0"

                      :                      /* no output */

                      : "d" (mask0),

                        "d" (mask1));        /* fpu control kb */

}

void

_start(void)

{

  char *p;

  enable_tracing ();

  set_stack (&end);

  init_Cregs ();

  /* The stack grows upwards, so this makes the heap start after a 256K

     stack area.  PlumHall known to fail with less than 73K of stack.  */

  brk (&end+0x40000);

  /* clear bss */

  memset (&bss_start, 0, &end - &bss_start);

  main(0, 0, 0);

  exit(0);

}