147 lines
3.2 KiB
PHP
147 lines
3.2 KiB
PHP
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MZ::
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.signature dw "MZ"
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.bytes_in_last_page dw .LENGTH and 1FFh
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.number_of_pages dw (.LENGTH-1) shr 9 + 1
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.number_of_relocations dw .NUMBER_OF_RELOCATIONS
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.number_of_header_paragraphs dw .HEADER_LENGTH shr 4
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.minimum_heap dw (.LENGTH+.RESERVED_LENGTH-1) shr 4 - (.LENGTH-1) shr 4
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.maximum_heap dw 0FFFFh
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.initial_ss dw 0
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.initial_sp dw 0
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.checksum dw 0
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.initial_ip dw 0
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.initial_cs dw 0
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.relocations_offset dw .relocations
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.overlay_number dw 0
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.relocations dw .NUMBER_OF_RELOCATIONS dup (?,?)
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rb 0Fh - ($%+0Fh) and 0Fh
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.HEADER_LENGTH = $
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.RELOCATION_INDEX = 0
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.ENTRY_DEFINED = 0
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.HEAP_DEFINED = 0
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.STACK_DEFINED = 0
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.STACK_LENGTH = 1000h
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org 0
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macro entry? definition
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local v
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if MZ.ENTRY_DEFINED
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err 'setting already specified'
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else match seg:offs, definition
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v = seg
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if v relativeto MZ.segment
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store v - MZ.segment : word at MZ : MZ.initial_cs
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else
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err 'incorrect segment'
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end if
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v = offs
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if v >= 0 & v < 10000h
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store v : word at MZ : MZ.initial_ip
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else
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err 'value out of range'
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end if
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MZ.ENTRY_DEFINED = 1
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else
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err 'invalid argument'
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end match
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end macro
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macro heap? definition
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local v,min
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if MZ.HEAP_DEFINED
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err 'setting already specified'
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else
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v = definition
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if v >= 0 & v < 10000h
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load min : word from MZ : MZ.minimum_heap
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v = v + min
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if v > 0FFFFh
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v = 0FFFFh
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end if
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store v : word at MZ : MZ.maximum_heap
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else
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err 'value out of range'
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end if
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MZ.HEAP_DEFINED = 1
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end if
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end macro
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macro stack? definition
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local v
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if MZ.STACK_DEFINED
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err 'setting already specified'
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else match seg:offs, definition
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v = seg
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if v relativeto MZ.segment
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store v - MZ.segment : word at MZ : MZ.initial_ss
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else
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err 'incorrect segment'
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end if
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v = offs
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if v >= 0 & v < 10000h
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store v : word at MZ : MZ.initial_sp
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else
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err 'value out of range'
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end if
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MZ.STACK_DEFINED = 1
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MZ.STACK_LENGTH = 0
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else
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MZ.STACK_DEFINED = 1
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MZ.STACK_LENGTH = definition
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end match
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end macro
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element MZ.segment
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macro segment? definition
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rb 0Fh - ($%+0Fh) and 0Fh
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match name =use16?, definition
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name := MZ.segment + ($%-MZ.HEADER_LENGTH) shr 4
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use16
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else match name =use32?, definition
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name := MZ.segment + ($%-MZ.HEADER_LENGTH) shr 4
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use32
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else match name, definition
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name := MZ.segment + ($%-MZ.HEADER_LENGTH) shr 4
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end match
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org 0
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end macro
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iterate word, word,dword
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calminstruction word? value
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compute value, value
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check value relativeto MZ.segment
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jno plain
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local offset
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compute offset, $%
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emit word, value - MZ.segment
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check $% > offset
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jno done
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compute offset, offset - MZ.HEADER_LENGTH
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compute offset, offset and 0FFFFh + (offset and not 0FFFFh) shl 12
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asm store offset:4 at MZ : MZ.relocations + MZ.RELOCATION_INDEX shl 2
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compute MZ.RELOCATION_INDEX, MZ.RELOCATION_INDEX + 1
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done:
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exit
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plain:
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emit word, value
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end calminstruction
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end iterate
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postpone
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if MZ.STACK_LENGTH
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rb 0Fh - ($%+0Fh) and 0Fh
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store ($%-MZ.HEADER_LENGTH) shr 4 : word at MZ : MZ.initial_ss
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rb MZ.STACK_LENGTH
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store MZ.STACK_LENGTH : word at MZ : MZ.initial_sp
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end if
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MZ.LENGTH = $%%
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MZ.RESERVED_LENGTH = $%-$%%
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MZ.NUMBER_OF_RELOCATIONS = MZ.RELOCATION_INDEX
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end postpone
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