213 lines
4.1 KiB
ArmAsm
213 lines
4.1 KiB
ArmAsm
#
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! $Source$
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! $State$
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! $Revision$
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! Declare segments (the order is important).
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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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MAX_ARGV = 10
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.sect .bss
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STACKSIZE = 512
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.comm stack, STACKSIZE
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.sect .text
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begtext:
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! Check if bss would overlap BDOS. We must not overwrite
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! BDOS and crash CP/M. We cheat by comparing only high bytes
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! of each address.
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lda 0x0007
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mov c, a ! c = high byte of BDOS address
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lda _cpm_ram+1 ! a = high byte of top of BSS, a.k.a. _end
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cmp c
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lxi d, noroom
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mvi c, 9
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jnc 0x0005 ! print error and exit if a >= c
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! We have to clear the bss. (argify requires it.)
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lxi h, begbss
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lxi b, endbss
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mvi e, 0
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1:
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mov m, e
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inx h
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mov a, b
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cmp h
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jnz 1b
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mov a, c
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cmp l
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jnz 1b
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! Set up the stack (now it's been cleared, since it's in the BSS).
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lxi h, 0
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dad sp
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shld saved_sp ! save old stack pointer
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lxi sp, stack + STACKSIZE
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! Initialise the rsts (if desired).
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#ifdef USE_I80_RSTS
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call .rst_init
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#endif
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! Now the 'heap'.
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lhld 0x0006 ! BDOS entry point
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lxi d, -0x806 ! offset to start of CCP
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dad d
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shld _cpm_ramtop
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! C-ify the command line at 0x0080.
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lxi h, 0x0080
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mov a, m ! a = length of command line
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cpi 0x7F ! 127-byte command lines...
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jnz 1f
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dcr a ! ...lose the last character
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1:
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adi 0x81 ! write a 0 at 0x0081+length
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mov l, a
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mov m, h
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! Now argify it.
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lxi b, 0x0081 ! bc = command line pointer
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lxi h, argv ! hl = argv pointer
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loop_of_argify:
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ldax b ! a = next character
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ora a ! check for end of string
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jz end_of_argify
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cpi ' ' ! scan for non-space
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jz 2f
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mov m, c ! put next argument in argv
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inx h
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mov m, b
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inx h
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lda argc ! increment argc
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inr a
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sta argc
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cpi MAX_ARGV ! exit loop if argv is full
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jz end_of_argify
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1: inx b ! scan for space
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ldax b
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ora a
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jz end_of_argify
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cpi ' '
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jnz 1b
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xra a ! replace the space with a '\0'
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stax b
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2: inx b
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jmp loop_of_argify
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end_of_argify:
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! Add the fake parameter for the program name.
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lxi h, progname
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shld argv0
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lxi h, argc
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inr m
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! Push the main() arguments and go.
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lxi h, envp
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push h
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lxi h, argv0
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push h
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lhld argc ! slightly evil
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mvi h, 0
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push h
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call __m_a_i_n
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.define _cpm_exit, EXIT, __exit
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_cpm_exit:
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EXIT:
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__exit:
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stc ! set carry bit
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jnc _cpm_warmboot ! warm boot if not set
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saved_sp = . + 1
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lxi sp, 0 ! patched on startup
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ret
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.align 2
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! Emergency exit routine.
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.define _cpm_warmboot
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_cpm_warmboot = 0
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! Special CP/M stuff.
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.define _cpm_fcb, _cpm_fcb2
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_cpm_fcb = 0x005c
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_cpm_fcb2 = 0x006c
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.define _cpm_ramtop
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.comm _cpm_ramtop, 2
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.define _cpm_default_dma
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_cpm_default_dma = 0x0080
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.define _cpm_iobyte
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_cpm_iobyte = 3
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.define _cpm_cmdlinelen, _cpm_cmdline
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_cpm_cmdlinelen = 0x0080
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_cpm_cmdline = 0x0081
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! Define symbols at the beginning of our various segments, so that we can find
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! them. (Except .text, which has already been done.)
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.define begtext, begdata, begbss
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.sect .data; begdata:
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.sect .rom; begrom:
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.sect .bss; begbss:
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! Some magic data. All EM systems need these.
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.define .ignmask, _errno
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.comm .ignmask, 2
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.comm _errno, 2
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! Used to store the argv array.
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.sect .bss
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argc: .space 2 ! number of args
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argv0: .space 2 ! always points at progname
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argv: .space 2*MAX_ARGV ! argv array (must be after argv0)
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envp: .space 2 ! envp array (always empty, must be after argv)
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! These are used specifically by the i80 code generator.
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.define .retadr, .retadr1
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.define .bcreg, .areg
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.define .tmp1, .fra, block1, block2, block3
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.comm .retadr, 2 ! used to save return address
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.comm .retadr1, 2 ! reserve
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.comm .bcreg, 2
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.comm .areg, 2
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.comm .tmp1, 2
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.comm .fra, 8 ! 8 bytes function return area
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block1: .space 4 ! used by 32 bits divide and
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block2: .space 4 ! multiply routines
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block3: .space 4 ! must be contiguous (.comm doesn't guarantee this)
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.sect .data
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.define _cpm_ram
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_cpm_ram: .data2 __end
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.sect .rom
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progname: .asciz 'ACKCPM'
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noroom: .ascii 'No room$'
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