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/*

 * redboot-syscalls.c -- provide system call support for RedBoot

 *

 * Copyright (c) 1997, 2001, 2002 Red Hat, Inc.

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 *

 */

#include <stdlib.h>

#include <sys/stat.h>

#include <sys/times.h>

#include <errno.h>

#include "syscall.h"

// Use "naked" attribute to suppress C prologue/epilogue

static int __attribute__ ((naked)) __syscall(int func_no, ...)

{

    asm ("mov   r12, lr\n");

#ifdef __thumb__

    asm ("swi 0x18\n");

#else

    asm ("swi 0x180001\n");

#endif

    asm ("mov   pc, r12\n");

}

int

_close(int fd)

{

    int  err;

    err = __syscall(SYS_close, fd);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

void

_exit(int stat)

{

    while (1)

        __syscall(SYS_exit, stat);

}

int

_stat (const char *filename, struct stat *st)

{

    int err;

    err = __syscall(SYS_stat, filename, st);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

int

_fstat (int file, struct stat *st)

{

    int err;

    err = __syscall(SYS_fstat, file, st);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

int

_getpid(void)

{

    return 1;

}

int

_gettimeofday (void * tp, void * tzp)

{

    int err;

    err = __syscall(SYS_gettimeofday, tp, tzp);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

int

_isatty(int fd)

{

    int err;

    err = __syscall(SYS_isatty, fd);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

int

_kill(int pid, int sig)

{

  if(pid == 1)

    _exit(sig);

  return 0;

}

off_t

_lseek(int fd, off_t offset, int whence)

{

    int err;

    err = __syscall(SYS_lseek, fd, offset, whence);

    if (err<0)

      {

        errno = -err;

        return (off_t)-1;

      }

    return err;

}

int

_open(const char *buf, int flags, int mode)

{

    int err ;

    err = __syscall(SYS_open, buf, flags, mode);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

int

_write(int fd, const char *buf, int nbytes)

{

    int err;

    err = __syscall(SYS_write, fd, buf, nbytes);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

void

print(char *ptr)

{

  char *p = ptr;

  while (*p != '\0')

    p++;

  _write (1, ptr, p-ptr);

}

void

_raise (void)

{

    return;

}

int

_read(int fd, char *buf, int nbytes)

{

    int err;

    err = __syscall(SYS_read, fd, buf, nbytes);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

extern char end[];                /* end is set in the linker command file */

char *heap_ptr;

char *

_sbrk (int nbytes)

{

    char        *base;

    if (!heap_ptr)

        heap_ptr = (char *)&end;

    base = heap_ptr;

    heap_ptr += nbytes;

    return base;

}

clock_t

_times(struct tms * tp)

{

    clock_t utime;

    int err;

    err = __syscall(SYS_times, &utime);

    if (err)

        utime = 0;

    if (tp) {

        tp->tms_utime = utime;

        tp->tms_stime = 0;

        tp->tms_cutime = 0;

        tp->tms_cstime = 0;

    }

    return utime;

}

int

_rename (const char *oldpath, const char *newpath)

{

    int err ;

    err = __syscall(SYS_rename, oldpath, newpath);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

int

_unlink (const char *pathname)

{

    int err ;

    err = __syscall(SYS_unlink, pathname);

    if (err<0)

      {

        errno = -err;

        return -1;

      }

    return err;

}

int

_system (const char *command)

{

    int err ;

    err = __syscall(SYS_system, command);

    return err;

}

#define SYS_meminfo     1001

void *

__get_memtop(void)

{

  unsigned long totmem = 0, topmem = 0;

  int numbanks;

  __syscall(SYS_meminfo, (unsigned long)&totmem, (unsigned long)&topmem, 0);

  return (void*)topmem;

}