; flat assembler
; Copyright (c) 1999-2020, Tomasz Grysztar
; All rights reserved.
init_memory:
; mov ecx, 16*1024*1024
;
; allocate_memory:
mcall SF_SYSTEM, SSF_GET_FREE_RAM
cmp eax, 0x38000000 shr 9
jbe @f
mov eax, 0x38000000 shr 9
@@:
shl eax, 9
xchg eax, ecx
mov [memory_setting],ecx
mcall SF_SYS_MISC, SSF_MEM_ALLOC
or eax,eax
jz out_of_memory
mov [memblock], eax
mov [additional_memory],eax
add eax,[memory_setting]
mov [memory_end],eax
mov eax,[memory_setting]
shr eax,2
add eax,[additional_memory]
mov [additional_memory_end],eax
mov [memory_start],eax
retn
exit_program:
cmp [_mode],NORMAL_MODE
jne @f
mcall SF_SYS_MISC, SSF_MEM_FREE, [memblock]
mov esp,[processing_esp]
jmp still
@@:
or eax,-1
mcall
get_tickcount:
push ebx
mcall SF_SYSTEM_GET,SSF_TIME_COUNT
imul eax,10
pop ebx
retn
macro BCDtoHEX al {
aam 16
aad 10 }
make_timestamp:
mcall SF_GET_SYS_DATE ; $00SSMMHH (BCD)
mov edx,eax
shr eax,16
BCDtoHEX al
push eax ; SECONDS
mov al,dh
BCDtoHEX al
push eax ; MINUTES
mov al,dl
BCDtoHEX al
push eax ; HOURS
mcall SF_GET_SYS_DATE ; $00DDMMYY (BCD)
mov edx,eax
shr eax,16
BCDtoHEX al
push eax ; DAY
mov al,dl
BCDtoHEX al
add eax,2000
push eax ; YEAR
mov ecx,eax
mov al,dh
BCDtoHEX al
push eax ; MONTH
; ecx: YEAR
; stack: MONTH, YEAR, DAY, HOURS, MINUTES, SECONDS, retaddr
mov eax,ecx
sub eax,1970
mov ebx,365
mul ebx
mov ebp,eax
mov eax,ecx
sub eax,1969
shr eax,2
add ebp,eax
mov eax,ecx
xor edx,edx
sub eax,1901
mov ebx,100
div ebx
sub ebp,eax
mov eax,ecx
xor edx,edx
sub eax,1601
mov ebx,400
div ebx
add ebp,eax
pop ecx
; ecx: MONTH
; stack: YEAR, DAY, HOURS, MINUTES, SECONDS, retaddr
mov eax,ecx
dec eax
mov ebx,30
mul ebx
add ebp,eax
cmp ecx,8
jbe months_correction
mov eax,ecx
sub eax,7
shr eax,1
add ebp,eax
mov ecx,8
months_correction:
mov eax,ecx
shr eax,1
add ebp,eax
cmp ecx,2
pop ecx
; ecx: YEAR
; stack: DAY, HOURS, MINUTES, SECONDS, retaddr
jbe day_correction_ok
sub ebp,2
test ecx,11b
jnz day_correction_ok
xor edx,edx
mov eax,ecx
mov ebx,100
div ebx
or edx,edx
jnz day_correction
mov eax,ecx
mov ebx,400
div ebx
or edx,edx
jnz day_correction_ok
day_correction:
inc ebp
day_correction_ok:
pop eax
; eax: DAY
; stack: HOURS, MINUTES, SECONDS, retaddr
dec eax
add eax,ebp
mov ebx,24
mul ebx
pop ecx
; ecx: HOURS
; stack: MINUTES, SECONDS, retaddr
add eax,ecx
mov ebx,60
mul ebx
pop ecx
; ecx: MINUTES
; stack: SECONDS, retaddr
add eax,ecx
mov ebx,60
mul ebx
pop ecx
; ecx: SECONDS
; stack: retaddr
add eax,ecx
retn
symbol_dump:
push edi
mov edx,[memory_end]
symb_dump:
cmp edx,[labels_list]
jbe symbols_dumped
sub edx,LABEL_STRUCTURE_SIZE
cmp dword [edx+24],0
je symb_dump ; do not dump anonymous symbols
test byte [edx+8],1
jz symb_dump ; do not dump symbols that didn't get defined
mov ax,[current_pass]
cmp ax,[edx+16]
jne symb_dump
test byte [edx+8],4 or 2
jnz symb_dump ; do not dump assembly-time variables
; do not dump variables defined with '='
cmp word [edx+12], 0
jnz symb_dump ; do not dump register-based variables
mov al, '0'
stosb
mov al, 'x'
stosb
mov eax, [edx+4]
mov ecx, 8
@@:
rol eax, 4
test al, 0xF
loopz @b
jz .nohigh
inc ecx
@@:
push eax
and al, 0xF
cmp al, 10
sbb al, 69h
das
stosb
pop eax
rol eax, 4
loop @b
mov eax, [edx]
mov ecx, 8
jmp .low
.nohigh:
mov eax, [edx]
mov ecx, 8
@@:
rol eax, 4
test al, 0xF
loopz @b
inc ecx
.low:
push eax
and al, 0xF
cmp al, 10
sbb al, 69h
das
stosb
pop eax
rol eax, 4
loop .low
mov al, ' '
stosb
mov esi,[edx+24]
movzx ecx,byte [esi-1]
rep movsb
mov ax,0A0Dh
stosw
jmp symb_dump
symbols_dumped:
mov edx,dbgfilename
push esi edi
mov esi, outfile
mov edi, edx
@@:
lodsb
stosb
test al, al
jnz @b
lea ecx, [edi-1]
@@:
dec edi
cmp edi, edx
jb @f
cmp byte [edi], '/'
jz @f
cmp byte [edi], '.'
jnz @b
mov ecx, edi
@@:
mov dword [ecx], '.dbg'
mov byte [ecx+4], 0
pop edi esi
call create
mov edx,[esp]
mov ecx,edi
sub ecx,edx
call write
call close
pop edi
retn
get_environment_variable:
mov ecx,[memory_end]
sub ecx,edi
cmp ecx,7
jb out_of_memory
cmp dword[esi],'INCL'
jne .finish
mov esi,_ramdisk
mov ecx,6
cld
rep movsb
.finish:
; stc
retn
alloc_handle:
; in:
; out: ebx = file handle
; on error: return to caller of caller with cf set
; preserves: esi, edi
call make_fullpaths
mov ebx, file_IO_slots+4
jmp check_file_IO_slot
next_file_IO_slot:
add ebx, 4+20+MAX_PATH
cmp ebx, file_IO_end
jae send_error_to_caller_of_caller
check_file_IO_slot:
cmp [ebx+FILEIO.cmd], -1
jnz next_file_IO_slot
and [ebx+FILEIO.offset], 0
and [ebx+FILEIO.flags], 0
adapt_path:
push esi edi ecx
mov esi, fullpath_open
lea edi, [ebx+namedFILEIO.name]
mov ecx, MAX_PATH
copy_path:
lodsb
cmp al,'\'
jne path_char_ok
mov al,'/'
path_char_ok:
stosb
or al,al
loopnz copy_path
pop ecx edi esi
jz adapt_path.done
send_error_to_caller_of_caller:
stc
pop eax
adapt_path.done:
ret
create:
; in:
; out: ebx = file handle, cf set on error
; preserves: esi, edi
call alloc_handle
and [ebx+FILEIO.filesize], 0
mov [ebx+FILEIO.cmd], SSF_CREATE_FILE
retn
open:
; in:
; out: ebx = file handle, cf set on error
; preserves: esi, edi
call alloc_handle
mov [ebx+FILEIO.cmd], SSF_GET_INFO
and [ebx+FILEIO.count], 0
mov [ebx+FILEIO.buffer], fileinfo
push ebx
mcall SF_FILE
pop ebx
test eax, eax
jnz fail_close
mov eax, dword[fileinfo.size]
mov [ebx+FILEIO.filesize], eax
and [ebx+FILEIO.cmd], SSF_READ_FILE
retn
fail_close:
stc
close:
; in: ebx = file handle
; preserves: ebx, esi, edi, cf
mov [ebx+FILEIO.cmd], -1 ; close handle
retn
write:
; in: ebx = file handle, edx - data, ecx = number of bytes
; out: cf set on error
; preserves: ebx, esi, edi
call read_write
mov [ebx+FILEIO.cmd], SSF_WRITE_FILE
jmp read_write_check_S_OK
read:
; in: ebx = file handle, edx - buffer, ecx = number of bytes
; out: cf set on error
; preserves: ebx, esi, edi
call read_write
cmp eax, 6
jz read_write_OK
read_write_check_S_OK:
test eax, eax
jz read_write_OK
stc
retn
read_write:
mov [ebx+FILEIO.count], ecx
mov [ebx+FILEIO.buffer], edx
push ebx
mcall SF_FILE
xchg eax, [esp]
add [eax+FILEIO.offset], ebx
adc [eax+FILEIO.offshigh], 0
mov ebx, eax
pop eax
read_write_OK:
retn
make_fullpaths:
pusha
push edx
mov esi,edx
mov ecx, MAX_PATH
copy_edxpath:
lodsb
cmp al,'\'
jne edxpath_char_ok
mov byte[esi-1],'/'
edxpath_char_ok:
or al,al
loopnz copy_edxpath
mov esi,path ; open
; DEBUGF " '%s'",esi
mov edi,fullpath_open
cld
newc1:
movsb
cmp byte[esi],0;' '
jne newc1
mov esi,[esp]
cmp byte[esi],'/'
jne @f
cmp byte[esi],'\'
jne @f
mov edi,fullpath_open
@@:
lodsb
stosb
cmp al,0
jne @b
mov esi,path ; write
mov edi,fullpath_write
cld
newc2:
movsb
cmp byte[esi],0;' '
jne newc2
mov esi,[esp]
cmp byte[esi],'/'
jne @f
cmp byte[esi],'\'
jne @f
mov edi,fullpath_write
@@:
lodsb
stosb
cmp al,0
jne @b
mov esi,path ; start
mov edi,file_io_start.path
cld
newc3:
movsb
cmp byte[esi],0;' '
jne newc3
pop esi
cmp byte[esi],'/'
jne @f
cmp byte[esi],'\'
jne @f
mov edi,file_io_start.path
@@:
lodsb
stosb
cmp al,0
jne @b
popa
retn
lseek:
; in: ebx = file handle, al = method, edx = delta offset
; out: cf set on error
; preserves: ebx, esi, edi
cmp al,FILE_BEGIN
jnz @f
and [ebx+FILEIO.offset], 0
jmp .common
@@: cmp al,FILE_END
jnz @f
mov eax, [ebx+FILEIO.filesize]
mov [ebx+FILEIO.offset], eax
jmp .common
@@:
.common:
add [ebx+FILEIO.offset], edx
retn
display_character:
pusha
cmp [_mode],NORMAL_MODE
jne @f
cmp al,$D
jz dc2
cmp al,$A
jnz dc1
and [textxy],0x0000FFFF
add [textxy], 8 shl 16 and 0xFFFF0000 + 18
popa
retn
dc1:
mov [dc],al
mov eax,[textxy]
cmp ax,word[bottom_right]
ja dc2
shr eax,16
cmp ax,word[bottom_right+2]
ja dc2
mov ecx,[sc.work_text]
or ecx,$10000000
mcall SF_DRAW_TEXT,[textxy],,dc,1
add [textxy],0x00080000
dc2:
popa
retn
@@:
mov cl,al
mcall SF_BOARD,SSF_DEBUG_WRITE
popa
retn
display_string:
; in:
; esi - ASCIIZ string
; preserves: ebx, esi
push esi
@@: lodsb
test al,al
je @f
call display_character
jmp @b
@@:
pop esi
retn
display_number:
push ebx
mov ecx,1000000000
xor edx,edx
xor bl,bl
display_loop:
div ecx
push edx
cmp ecx,1
je display_digit
or bl,bl
jnz display_digit
or al,al
jz digit_ok
not bl
display_digit:
add al,'0'
push ebx ecx
call display_character
pop ecx ebx
digit_ok:
mov eax,ecx
xor edx,edx
mov ecx,10
div ecx
mov ecx,eax
pop eax
or ecx,ecx
jnz display_loop
pop ebx
retn
display_user_messages:
; push [skinh]
; pop [textxy]
; add [textxy], 7 shl 16 +53
mov [displayed_count],0
call show_display_buffer
cmp [displayed_count],1
jb line_break_ok
je make_line_break
mov ax,word[last_displayed]
cmp ax,0A0Dh
je line_break_ok
cmp ax,0D0Ah
je line_break_ok
make_line_break:
mov esi,crlf
call display_string
line_break_ok:
retn
display_block:
; in:
; esi - string
; ecx = string length
push esi
@@: lodsb
call display_character
loop @b
pop esi
retn
fatal_error:
; no return, trashes stack
mov esi,error_prefix
call display_string
pop esi
call display_string
mov esi,error_suffix
call display_string
mov esi,crlf
call display_string
mov al,0FFh
jmp exit_program
assembler_error:
call display_user_messages
push 0
mov ebx,[current_line]
get_error_lines:
push ebx
test byte [ebx+7],80h
jz display_error_line
mov edx,ebx
find_definition_origin:
mov edx,[edx+12]
test byte [edx+7],80h
jnz find_definition_origin
push edx
mov ebx,[ebx+8]
jmp get_error_lines
display_error_line:
mov esi,[ebx]
call display_string
mov esi,line_number_start
call display_string
mov eax,[ebx+4]
and eax,7FFFFFFFh
call display_number
mov al,']'
call display_character
pop esi
cmp ebx,esi
je line_number_ok
mov al,' '
call display_character
push esi
mov esi,[esi]
movzx ecx,byte [esi]
inc esi
call display_block
mov esi,line_number_start
call display_string
pop esi
mov eax,[esi+4]
and eax,7FFFFFFFh
call display_number
mov al,']'
call display_character
line_number_ok:
mov esi,line_data_start
call display_string
mov esi,ebx
mov edx,[esi]
call open
mov al,2
xor edx,edx
call lseek
mov edx,[esi+8]
sub eax,edx
push eax
xor al,al
call lseek
mov ecx,[esp]
mov edx,[additional_memory]
lea eax,[edx+ecx]
cmp eax,[additional_memory_end]
ja out_of_memory
call read
call close
pop ecx
mov esi,[additional_memory]
get_line_data:
mov al,[esi]
cmp al,$A
je display_line_data
cmp al,$D
je display_line_data
cmp al,$1A
je display_line_data
or al,al
jz display_line_data
inc esi
loop get_line_data
display_line_data:
mov ecx,esi
mov esi,[additional_memory]
sub ecx,esi
call display_block
mov esi,crlf
call display_string
pop ebx
or ebx,ebx
jnz display_error_line
mov esi,error_prefix
call display_string
pop esi
call display_string
mov esi,error_suffix
call display_string
jmp exit_program