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errno/errno_location fix for ppc mmap

#include "dietfeatures.h"
#include <sys/types.h>
#include <errno.h>
#include "syscalls.h"

int mmap(void*start,size_t length,int prot,int flags,int fd,off_t offset) {
  unsigned long __sc_ret, __sc_err;
  {
    register unsigned long __sc_0 __asm__ ("r0");
    register unsigned long __sc_3 __asm__ ("r3");
    register unsigned long __sc_4 __asm__ ("r4");
    register unsigned long __sc_5 __asm__ ("r5");
    register unsigned long __sc_6 __asm__ ("r6");
    register unsigned long __sc_7 __asm__ ("r7");
    register unsigned long __sc_8 __asm__ ("r8");

    __sc_3 = (unsigned long) (start);
    __sc_4 = (unsigned long) (length);
    __sc_5 = (unsigned long) (prot);
    __sc_6 = (unsigned long) (flags);
    __sc_7 = (unsigned long) (fd);
    __sc_8 = (unsigned long) (offset);
    __sc_0 = __NR_mmap;
    __asm__ __volatile__
	    ("sc           \n\t"
	      "mfcr %1      "
	    : "=&r" (__sc_3), "=&r" (__sc_0)
	    : "0"   (__sc_3), "1"   (__sc_0),
	      "r"   (__sc_4),
	      "r"   (__sc_5),
	      "r"   (__sc_6),
	      "r"   (__sc_7),
	      "r"   (__sc_8)
	    : "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12");
    __sc_ret = __sc_3;
    __sc_err = __sc_0;
  }
  return (__sc_err & 0x10000000 ? errno = __sc_ret, __sc_ret = -1 : 0),
	  (int) __sc_ret;
}