929 lines
12 KiB
ArmAsm
929 lines
12 KiB
ArmAsm
.define .mon
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.define uxfinish
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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! monitor instruction
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! a small collection of UNIX system calls implemented under CP/M
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! ux_indir=e.mon
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! ux_fork=e.mon
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! ux_wait=e.mon
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! ux_link=e.mon
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! ux_exec=e.mon
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! ux_chdir=e.mon
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! ux_mknod=e.mon
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! ux_chmod=e.mon
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! ux_chown=e.mon
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! ux_break=e.mon
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! ux_stat=e.mon
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! ux_seek=e.mon
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! ux_mount=e.mon
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! ux_umount=e.mon
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! ux_setuid=e.mon
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! ux_getuid=e.mon
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! ux_stime=e.mon
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! ux_ptrace=e.mon
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! ux_alarm=e.mon
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! ux_fstat=e.mon
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! ux_pause=e.mon
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! ux_utime=e.mon
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! ux_stty=e.mon
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! ux_gtty=e.mon
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! ux_access=e.mon
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! ux_nice=e.mon
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! ux_sync=e.mon
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! ux_kill=e.mon
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! ux_dup=e.mon
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! ux_pipe=e.mon
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! ux_times=e.mon
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! ux_prof=e.mon
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! ux_unused=e.mon
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! ux_setgid=e.mon
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! ux_getgid=e.mon
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! ux_sig=e.mon
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! ux_umask=e.mon
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! ux_chroot=e.mon
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EPERM = 1
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ENOENT = 2
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ESRCH = 3
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EINTR = 4
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EIO = 5
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ENXIO = 6
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E2BIG = 7
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ENOEXEC = 8
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EBADF = 9
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ECHILD = 10
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EAGAIN = 11
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ENOMEM = 12
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EACCES = 13
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EFAULT = 14
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ENOTBLK = 15
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EBUSY = 16
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EEXIST = 17
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EXDEV = 18
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ENODEV = 19
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ENOTDIR = 20
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EISDIR = 21
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EINVAL = 22
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ENFILE = 23
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EMFILE = 24
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ENOTTY = 25
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ETXTBSY = 26
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EFBIG = 27
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ENOSPC = 28
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ESPIPE = 29
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EROFS = 30
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EMLINK = 31
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EPIPE = 32
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EDOM = 33
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! Structure of filearea maintained by this implementation
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! First iobuffer of 128 bytes
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! Then the fcb area of 36 bytes
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! The number of bytes left in the buffer, 1 byte
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! The iopointer into the buffer, 2 bytes
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! The openflag 0 unused, 1 reading, 2 writing, 1 byte
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! The filedescriptor starting at 3, 1 byte
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! The number of CTRL-Zs that have been absorbed, 1 byte
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! The byte read after a sequence of CTRL-Zs, 1 byte
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maxfiles=8
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filesize=128+36+1+2+1+1+1+1
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filefcb=0 ! pointers point to fcb
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position=33
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nleft=36
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iopointer=37
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openflag=39
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fildes=40
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zcount=41
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zsave=42
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.assert [ filefcb] <> 0
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0: .space maxfiles*filesize
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filearea = 0b+128
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sibuf:
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.data2 0
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.space 82
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siptr: .space 2
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saveargs:
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.space 128
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argc: .space 2
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ttymode:.data1 9,9,8,21;.data2 06310+RAW*040 ! raw = 040
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return:
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.data2 0,0
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uxinit:
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xor a
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ld c,maxfiles
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ld hl,0b
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1: ld b,filesize
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2: ld (hl),a
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inc hl
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djnz 2b
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dec c
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jr nz,1b
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ret
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uxfinish:
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ld a,maxfiles-1
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1: push af
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call closefil
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pop af
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dec a
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cp 0377
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jr nz,1b
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ret
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.mon:
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pop ix
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ld (return),ix ! return adres
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pop de ! system call number
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xor a
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or d
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jr nz,unimpld ! too big
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ld a,e
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and 0300 ! only 64 system calls
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jr nz,unimpld
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sla e
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ld hl,systab
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add hl,de
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ld e,(hl)
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inc hl
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ld d,(hl)
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ex de,hl
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jp (hl)
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systab:
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.data2 e.mon ! ux_indir
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.data2 ux_exit
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.data2 e.mon ! ux_fork
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.data2 ux_read
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.data2 ux_write
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.data2 ux_open
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.data2 ux_close
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.data2 e.mon ! ux_wait
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.data2 ux_creat
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.data2 e.mon ! ux_link
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.data2 ux_unlink
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.data2 e.mon ! ux_exec
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.data2 e.mon ! ux_chdir
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.data2 ux_time
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.data2 e.mon ! ux_mknod
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.data2 e.mon ! ux_chmod
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.data2 e.mon ! ux_chown
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.data2 e.mon ! ux_break
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.data2 e.mon ! ux_stat
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.data2 e.mon ! ux_seek
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.data2 ux_getpid
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.data2 e.mon ! ux_mount
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.data2 e.mon ! ux_umount
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.data2 e.mon ! ux_setuid
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.data2 e.mon ! ux_getuid
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.data2 e.mon ! ux_stime
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.data2 e.mon ! ux_ptrace
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.data2 e.mon ! ux_alarm
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.data2 e.mon ! ux_fstat
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.data2 e.mon ! ux_pause
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.data2 e.mon ! ux_utime
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.data2 e.mon ! ux_stty
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.data2 e.mon ! ux_gtty
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.data2 e.mon ! ux_access
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.data2 e.mon ! ux_nice
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.data2 ux_ftime
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.data2 e.mon ! ux_sync
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.data2 e.mon ! ux_kill
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.data2 unimpld
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.data2 unimpld
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.data2 unimpld
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.data2 e.mon ! ux_dup
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.data2 e.mon ! ux_pipe
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.data2 e.mon ! ux_times
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.data2 e.mon ! ux_prof
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.data2 e.mon ! ux_unused
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.data2 e.mon ! ux_setgid
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.data2 e.mon ! ux_getgid
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.data2 e.mon ! ux_sig
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.data2 unimpld
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.data2 unimpld
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.data2 unimpld
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.data2 unimpld
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.data2 unimpld
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.data2 ux_ioctl
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.data2 unimpld
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.data2 unimpld
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.data2 unimpld
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.data2 unimpld
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.data2 unimpld ! ux_exece
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.data2 e.mon ! ux_umask
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.data2 e.mon ! ux_chroot
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.data2 unimpld
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.data2 unimpld
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emptyfile:
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! searches for a free filestructure
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! returns pointer in iy, 0 if not found
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ld ix,filearea
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ld l,maxfiles
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1:
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xor a
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or (ix+openflag)
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jr nz,3f
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ld a,maxfiles+3
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sub l
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ld (ix+fildes),a
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! #ifdef CPM1
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push iy
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push ix
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ld de,-128
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add ix,de
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push ix
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pop de
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ld c,setdma
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call bdos
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pop ix
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pop iy
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or a ! to clear C
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! #endif
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ret
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3:
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ld de,filesize
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add ix,de
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dec l
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jr nz,1b
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scf
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ret
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findfile:
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ld ix,filearea
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ld de,filesize
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0:
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dec a
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ret m
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add ix,de
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jr 0b
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getchar:
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push iy
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push de
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push hl
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dec (ix+nleft)
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jp p,0f
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push ix
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pop hl
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ld de,-128
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add hl,de
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ld (ix+iopointer),l
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ld (ix+iopointer+1),h
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ex de,hl
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push ix
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ld c,setdma
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call bdos
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! #ifdef CPM1
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ld c,seqread
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! #else
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! ld c,randomread
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! #endif
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pop de
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call bdos
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or a
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jr z,1f
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ld (ix+zcount),0
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pop hl
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pop de
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pop iy
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scf
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ret
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1:
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inc (ix+position)
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jr nz,2f
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inc (ix+position+1)
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2:
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ld a,127
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ld (ix+nleft),a
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0:
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ld h,(ix+iopointer+1)
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ld l,(ix+iopointer)
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ld a,(hl)
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inc hl
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ld (ix+iopointer),l
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ld (ix+iopointer+1),h
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pop hl
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pop de
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pop iy
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ret
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or a
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putchar:
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push hl
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ld h,(ix+iopointer+1)
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ld l,(ix+iopointer)
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ld (hl),a
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dec (ix+nleft)
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jr z,0f
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inc hl
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ld (ix+iopointer+1),h
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ld (ix+iopointer),l
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pop hl
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ret
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0:
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pop hl
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flsbuf:
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push hl
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push de
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push iy
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push ix
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pop hl
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ld de,-128
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add hl,de
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ld (ix+iopointer+1),h
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ld (ix+iopointer),l
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ex de,hl
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push ix
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ld c,setdma
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call bdos
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pop de
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! #ifdef CPM1
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ld c,seqwrite
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! #else
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! ld c,randomwrite
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! #endif
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call bdos
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or a
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jr z,1f
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pop iy
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pop de
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pop hl
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scf
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ret
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1:
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inc (ix+position)
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jr nz,2f
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inc (ix+position+1)
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2:
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ld a,128
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ld (ix+nleft),a
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ld b,a
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push ix
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pop hl
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ld de,-128
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add hl,de
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ld a,26 ! ctrl z
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1: ld (hl),a
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inc hl
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djnz 1b
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pop iy
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pop de
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pop hl
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or a
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ret
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parsename:
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! parses file name pointed to by hl and fills in fcb
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! of the file pointed to by ix.
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! recognizes filenames as complicated as 'b:file.zot'
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! and as simple as 'x'
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push iy
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push ix
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pop de
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xor a
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push de
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ld b,36 ! sizeof fcb
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0: ld (de),a
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inc de
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djnz 0b
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pop de
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inc hl
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ld a,(hl)
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dec hl
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cp ':' ! drive specified ?
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jr nz,1f
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ld a,(hl)
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inc hl
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inc hl
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dec a
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and 15
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inc a ! now 1<= a <= 16
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ld (de),a
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1: inc de
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ld b,8 ! filename maximum of 8 characters
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1: ld a,(hl)
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or a
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jr nz,8f
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dec hl
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ld a,'.'
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8:
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inc hl
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cp '.'
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jr z,2f
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and 0177 ! no parity
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bit 6,a
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jr z,9f
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and 0337 ! UPPER case
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9:
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ld (de),a
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inc de
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djnz 1b
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ld a,(hl)
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inc hl
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cp '.'
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jr z,3f
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ld a,' '
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ld (de),a
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inc de
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ld (de),a
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inc de
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ld (de),a
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pop iy
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ret ! filenames longer than 8 are truncated
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2: ld a,' ' ! fill with spaces
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0: ld (de),a
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inc de
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djnz 0b
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3: ld b,3 ! length of extension
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1: ld a,(hl)
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inc hl
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or a
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jr z,4f
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cp 0100
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jp m,2f
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and 0137
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2: ld (de),a
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inc de
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djnz 1b
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pop iy
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ret
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4: ld a,' '
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0: ld (de),a
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inc de
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djnz 0b
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pop iy
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ret
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! various routines
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ux_close:
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pop hl
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ld a,l
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sub 3
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jp m,1f
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cp maxfiles
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call m,closefil
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1: ld hl,0
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push hl ; jr rtn
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closefil:
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call findfile
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ld a,(ix+openflag)
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or a
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jr z,3f
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ld (ix+openflag),0
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cp 1
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jr z,2f
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ld a,(ix+nleft)
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cp 128
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jr z,2f
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call flsbuf
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2:
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push iy
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push ix
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pop de
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ld c,close
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call bdos
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pop iy
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3: ret
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ux_ioctl:
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pop hl
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ld a,l
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sub 3
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jp p,1f
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pop hl
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ld a,h
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cp 't'
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jr nz,e.mon
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ld a,l
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cp 8
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jr z,tiocgetp
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cp 9
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jr z,tiocsetp
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jr e.mon
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1: pop hl
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pop hl
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ld hl,-1
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push hl ; jr rtn
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tiocgetp:
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pop de
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ld hl,ttymode
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2: push bc
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ld bc,6
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ldir
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ld h,b
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ld l,c
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pop bc
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push hl ; jr rtn
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tiocsetp:
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pop hl
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ld de,ttymode
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jr 2b
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ux_time:
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call time4
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rtn: ld ix,(return) ; jp (ix)
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ux_ftime:
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pop hl
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ld (retarea+6),hl
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call time4
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ld hl,(retarea+6)
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pop de
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ld (hl),e
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inc hl
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ld (hl),d
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inc hl
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pop de
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ld (hl),e
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inc hl
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ld (hl),d
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inc hl
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xor a
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ld (hl),a
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inc hl
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ld (hl),a
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inc hl
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ld (hl),a
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inc hl
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ld (hl),a
|
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inc hl
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ld (hl),a
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inc hl
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ld (hl),a
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ld ix,(return) ; jp (ix)
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time4:
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pop hl
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ld (retarea),iy
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ld (retarea+2),bc
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ld (retarea+4),hl
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ld hl,(timebuf+2)
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push hl
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ld hl,(timebuf)
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push hl
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ld hl,0
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push hl
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ld hl,50
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push hl
|
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call .dvu4
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ld iy,(retarea)
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ld bc,(retarea+2)
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ld hl,(retarea+4)
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jp (hl)
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ux_exit:
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call uxfinish
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ld c,reset
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call bdos
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|
! no return
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|
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ux_creat:
|
|
call emptyfile
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|
jr c,openfailed
|
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pop hl
|
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call parsename
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pop hl ! file mode, not used under CP/M
|
|
push iy
|
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push ix
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push ix
|
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pop de
|
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ld c,delete
|
|
call bdos
|
|
pop de
|
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ld c,makefile
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call bdos
|
|
pop iy
|
|
ld l,1
|
|
jr afteropen
|
|
ux_open:
|
|
call emptyfile
|
|
jr nc,1f
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|
openfailed:
|
|
pop hl
|
|
pop hl ! remove params
|
|
ld hl,EMFILE
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push hl
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push hl ; jr rtn
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1:
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pop hl ! filename
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call parsename
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push iy
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ld c,open
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push ix
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pop de
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call bdos
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pop iy
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pop hl
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afteropen:
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inc a
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jr nz,1f
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ld hl,ENOENT
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push hl
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push hl ; jr rtn
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1:
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inc l
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ld (ix+openflag),l
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xor a
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ld (ix+nleft),a
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ld (ix+zcount),a
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ld (ix+zsave),26
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bit 1,l
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jr z,2f
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ld (ix+nleft),128
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2:
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ld (ix+position),a
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ld (ix+position+1),a
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push ix
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pop hl
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push bc
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ld b,128
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3: dec hl
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ld (hl),26
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djnz 3b
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pop bc
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ld (ix+iopointer+1),h
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|
ld (ix+iopointer),l
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|
ld h,a
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ld l,(ix+fildes)
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push hl
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ld l,a
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push hl ; jr rtn
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|
|
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ux_read:
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|
pop hl
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ld a,l
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sub 3
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jp p,readfile
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ld a,(ttymode+4)
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bit 5,a
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jr z,1f ! not raw
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|
push iy
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|
! #ifdef CPM1
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!raw echo interface
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ld c,consolein
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call bdos
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! #else
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! !no echo interface
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|
! 4:
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! ld c,diconio
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|
! ld e,0xff
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! call bdos
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! or a
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! jr z,4b
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!end of no echo interface
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! #endif
|
|
pop iy
|
|
pop hl
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ld (hl),a
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|
pop hl
|
|
ld hl,1
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|
push hl
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|
ld hl,0
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|
push hl ; jr rtn
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1:
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ld hl,sibuf+1 ! read from console assumed
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dec (hl)
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|
jp p,2f
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dec hl ! go read console line
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|
ld (hl),80 ! max line length
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|
push iy
|
|
push hl
|
|
ld c,readconsole
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|
ex de,hl
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call bdos
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ld c,writeconsole
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ld e,'\n'
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|
call bdos
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|
pop hl
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|
pop iy
|
|
inc hl
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|
inc (hl)
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|
ld (siptr),hl ! ready for transfer
|
|
push hl
|
|
ld e,(hl)
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|
ld d,0
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|
add hl,de
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|
ld (hl),'\r'
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|
inc hl
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|
ld (hl),'\n'
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|
pop hl
|
|
2:
|
|
push bc
|
|
pop ix
|
|
ld b,(hl)
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|
inc b ! bytes remaining
|
|
pop hl ! copy to
|
|
pop de ! bytes wanted (probably 512)
|
|
push ix
|
|
ld ix,(siptr) ! copy from
|
|
xor a ! find out minimum of ramaining and wanted
|
|
or d
|
|
jr nz,3f ! more than 255 wanted (forget that)
|
|
ld a,b
|
|
cp e
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|
jp m,3f ! not enough remaining
|
|
ld b,e
|
|
3:
|
|
ld c,b ! keep copy
|
|
0:
|
|
inc ix
|
|
ld a,(ix)
|
|
ld (hl),a
|
|
inc hl
|
|
djnz 0b
|
|
ld a,(sibuf+1)
|
|
sub c
|
|
inc a
|
|
ld (sibuf+1),a
|
|
ld (siptr),ix
|
|
pop hl
|
|
push bc
|
|
ld c,b
|
|
push bc ! load 0
|
|
ld b,h
|
|
ld c,l
|
|
ld ix,(return) ; jp (ix)
|
|
readfile:
|
|
call findfile
|
|
pop de
|
|
pop hl ! count
|
|
push bc
|
|
ld bc,0
|
|
0:
|
|
xor a
|
|
or l
|
|
jr z,1f
|
|
dec l
|
|
3:
|
|
! warning: this may not work if zcount overflows
|
|
ld a,(ix+zcount)
|
|
or a
|
|
jr nz,5f
|
|
ld a,(ix+zsave)
|
|
cp 26
|
|
jr z,4f
|
|
ld (ix+zsave),26
|
|
jr 8f
|
|
4:
|
|
call getchar
|
|
jr c,2f
|
|
ld (de),a
|
|
sub 26 ! CTRL-Z
|
|
jr z,7f
|
|
ld a,(ix+zcount)
|
|
or a
|
|
jr z,6f
|
|
ld a,(de)
|
|
ld (ix+zsave),a
|
|
5:
|
|
ld a,26
|
|
dec (ix+zcount)
|
|
8:
|
|
ld (de),a
|
|
6:
|
|
inc de
|
|
inc bc
|
|
jr 0b
|
|
1:
|
|
dec l
|
|
dec h
|
|
jp p,3b
|
|
2:
|
|
pop hl
|
|
push bc
|
|
ld b,h
|
|
ld c,l
|
|
ld hl,0
|
|
push hl ; jr rtn
|
|
7:
|
|
inc (ix+zcount)
|
|
jr 4b
|
|
|
|
ux_write:
|
|
pop hl
|
|
ld a,l
|
|
sub 3
|
|
jp p,writefile
|
|
pop hl ! buffer address
|
|
pop de ! count
|
|
push de
|
|
ld ix,0
|
|
push ix
|
|
push bc
|
|
ld b,e ! count now in 'db'
|
|
0:
|
|
ld a,b
|
|
or a
|
|
jr nz,1f
|
|
ld a,d
|
|
or a
|
|
jr nz,2f
|
|
pop bc
|
|
ld ix,(return) ; jp (ix)
|
|
2:
|
|
dec d
|
|
1:
|
|
dec b
|
|
ld e,(hl)
|
|
inc hl
|
|
push bc
|
|
push de
|
|
push hl
|
|
ld c,writeconsole
|
|
call bdos
|
|
pop hl
|
|
pop de
|
|
pop bc
|
|
jr 0b
|
|
writefile:
|
|
call findfile
|
|
pop de
|
|
pop hl ! count
|
|
push bc
|
|
ld bc,0
|
|
0:
|
|
xor a
|
|
or l
|
|
jr z,1f
|
|
dec l
|
|
3:
|
|
ld a,(de)
|
|
inc de
|
|
call putchar
|
|
jr c,4f
|
|
inc bc
|
|
jr 0b
|
|
1:
|
|
dec l
|
|
dec h
|
|
jp p,3b
|
|
ld ix,0
|
|
2:
|
|
pop hl
|
|
push bc
|
|
ld b,h
|
|
ld c,l
|
|
push ix
|
|
ld ix,(return) ; jp (ix)
|
|
4:
|
|
ld ix,ENOSPC
|
|
jr 2b
|
|
|
|
ux_unlink:
|
|
pop hl
|
|
ld ix,fcb
|
|
call parsename
|
|
push bc
|
|
ld c,delete
|
|
ld de,fcb
|
|
call bdos
|
|
pop bc
|
|
inc a
|
|
jr nz,1f
|
|
ld hl,ENOENT
|
|
push hl ; jr rtn
|
|
1:
|
|
ld hl,0
|
|
push hl ; jr rtn
|
|
|
|
ux_getpid:
|
|
ld hl,12345 ! nice number
|
|
push hl ; jr rtn
|
|
|
|
|
|
|
|
|
|
|
|
|
|
retarea: .data2 0 ! base of buffer for result values (max 8 bytes)
|
|
.data2 0
|
|
.data2 0
|
|
.data2 0
|
|
|
|
trapproc:
|
|
.data2 0
|
|
|
|
nextp: .data1 0
|
|
|
|
header:
|
|
ntext: .data2 0
|
|
ndata: .data2 0
|
|
nproc: .data2 0
|
|
entry: .data2 0
|
|
nline: .data2 0
|
|
|
|
hp: .data2 0
|
|
pb: .data2 0
|
|
pd: .data2 0
|