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/* Copyright (C) 1996 Robert de Bath <robert@mayday.compulink.co.uk>
* This file is part of the Linux-8086 C library and is distributed
* under the GNU Library General Public License.
*/
#if !__FIRST_ARG_IN_AX__
#ifdef __AS386_16__
#ifdef __STANDALONE__
#include <bios.h>
#include <fcntl.h>
#include <errno.h>
#ifdef L_bios_start
char ** environ = { 0 };
int errno;
void (*__cleanup)() = 0;
#asm
.data
export ___argr
___argr:
.word 0,0,0,0,0,0,0 ! A struct REGS
defarg:
.word boot_str, 0
boot_str:
.asciz "boot"
loop_save:
.word 0
.text
export ___cstartup ! Crt0 startup
___cstartup:
mov ___argr+0,ax
mov ___argr+2,bx
mov ___argr+4,cx
mov ___argr+6,dx
mov ___argr+8,si
mov ___argr+10,di
zap_bss: ! Clear the BSS
mov ax,ds
mov es,ax ! ES now data seg
mov di,#__edata
mov cx,#__end
sub cx,di
xor ax,ax
cld
rep
stosb
push [_environ]
mov ax,#defarg ! Don`t define __mkargv, standalone programs don`t
push ax ! get any arguments.
mov ax,#1
push ax
mov bx,#auto_start ! Pointer to first autostart function
auto_run:
mov [loop_save],bx
mov bx,[bx]
test bx,bx
jz no_entry
call bx ! Call the function
no_entry:
mov bx,[loop_save]
inc bx ! next
inc bx
jmp auto_run ! And round for the next.
call_exit: ! Last item called by above.
pop bx ! Be tidy.
push ax ! At the end the last called was main() push it`s
call _exit ! return val and call exit();
bad_exit:
jmp bad_exit ! Exit returned !!
loc 2
.word _main ! Segment 2 is the trailing pointers, main and the
.word call_exit ! routine to call exit.
data_start:
.text
export _exit
_exit: ! exit(rv) function
mov bx,sp
push [bx+2] ! Copy the `rv` for the exit fuctions.
mov bx,[___cleanup] ! Call exit, normally this is `__do_exit`
test bx,bx
je no_clean ! But it`s default is null
call bx
no_clean:
inc sp
inc sp
export __exit
__exit:
xor ax,ax
mov es,ax
mov ax,cs
seg es
mov [$E6*4+2],ax
mov ax,#reti_ins
seg es
mov [$E6*4],ax
mov ax,#$FFFF
int $E6 ! Try to exit DOSEMU
! If we get here we`re not in dosemu.
seg es
mov [$472],#$1234 ! Warm reboot.
jmpi $0000,$FFFF
reti_ins:
reti
#endasm
#endif
/****************************************************************************/
#ifdef L_bios_write
write(fd,buf,len)
int fd,len;
char * buf;
{
register int v, c;
if(fd == 1 || fd == 2)
{
for(v=len; v>0; v--)
{
c= *buf++;
if( c == '\n') bios_putc('\r');
bios_putc(c);
}
return len;
}
return (*__files)(CMD_WRITE, fd, buf, len);
}
#endif
/****************************************************************************/
#ifdef L_bios_read
read(fd,buf,len)
int fd,len;
char * buf;
{
if(fd == 0) return bios_rdline(buf, len);
return (*__files)(CMD_READ, fd, buf, len);
}
#endif
/****************************************************************************/
#ifdef L_bios_lseek
long
lseek(fd, offt, whence)
int fd, whence;
long offt;
{
if( fd >= 0 && fd <= 2 ) errno = ESPIPE;
else
{
if( (*__files)(CMD_LSEEK, fd, &offt, whence) >= 0 )
return offt;
}
return -1L;
}
#endif
/****************************************************************************/
#ifdef L_bios_close
close(fd)
int fd;
{
if( fd >= 0 && fd <= 2 ) errno = ENOSYS;
else
return (*__files)(CMD_CLOSE, fd);
return -1;
}
#endif
/****************************************************************************/
#ifdef L_bios_nofiles
int (*__files)() = __nofiles;
int __nofiles(cmd, fd, buf, len)
int cmd, fd, len;
char * buf;
{
errno = EBADF;
return -1;
}
#endif
/****************************************************************************/
#ifdef L_bios_isatty
isatty(fd)
int fd;
{
if( fd >= 0 && fd <= 2 ) return 1;
return 0;
}
#endif
/****************************************************************************/
#ifdef L_bios_open
extern int __fileops();
open(name, flags, mode)
char * name;
int flags, mode;
{
__files = __fileops;
return (*__files)(CMD_OPEN, flags, name, mode);
}
#endif
/****************************************************************************/
#endif
#endif
#endif
|
