156 lines
3.3 KiB
NASM
156 lines
3.3 KiB
NASM
use32
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open: cmp edx,input_magic
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jne fail
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mov ebx,[edx]
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ret
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close: cmp ebx,[input_magic]
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jne fail
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xor ebx,ebx ;CF=0
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ret
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lseek: cmp ebx,[input_magic]
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jne fail
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cmp al,2
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je .end
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cmp al,1
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je .pos
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cmp al,0
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jne fail
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.str:
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mov eax,edx
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cmp eax,[input_size]
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ja fail
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jmp .ok
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.end:
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mov eax,[input_size]
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neg edx
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add eax,edx
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jc fail
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.ok:
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mov [input_start],eax
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clc
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ret
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.pos:
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mov eax,[input_start]
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add eax,edx
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cmp eax,[input_size]
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ja fail
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jmp .ok
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read: cmp ebx,[input_magic]
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jne fail
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push esi edi
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mov esi,[input_start]
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add esi,[input_code]
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mov eax,[input_size]
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mov edi,edx
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cmp eax,ecx
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jnc skip
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mov ecx,eax
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skip: mov eax,ecx
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add [input_start],eax
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shr ecx,2
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cld
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rep movsd
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mov cl,al
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and cl,3
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rep movsb
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pop edi esi
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clc
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ret
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write: ;not implemented
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create: ;not implemented
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fail: stc
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ret
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make_timestamp:
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xor eax,eax ;not implemented
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get_environment_variable: ;not implemented
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display_block: ;not implemented
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ret
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assembler_error: fatal_error:
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pop [output_errs]
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stc
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jmp stack_restore
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Assemble:
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xor eax,eax
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mov [output_errs],eax
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mov [output_size],eax
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mov [input_start],eax
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mov [input_file],input_magic
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mov [input_size],ecx
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mov [input_code],esi
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mov [input_stack],esp
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mov [memory_start],StdMemStr
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mov [memory_end],StdMemEnd
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mov [additional_memory],AddMemStr
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mov [additional_memory_end],AddMemEnd
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lea eax,[esp-4*1024]
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mov [stack_limit],eax
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call preprocessor
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call parser
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call assembler
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mov esi,[code_start]
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mov ecx,edi
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sub ecx,esi
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mov eax,256
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cmp ecx,eax
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jna max_256
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mov ecx,eax
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max_256:
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mov [output_size],ecx
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mov edi,output_data
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rep movsb
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stack_restore:
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mov esp,[input_stack]
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mov esi,[output_errs]
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ret
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include 'fasm\version.inc'
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include 'fasm\errors.inc'
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include 'fasm\symbdump.inc'
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include 'fasm\preproce.inc'
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include 'fasm\parser.inc'
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include 'fasm\exprpars.inc'
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include 'fasm\assemble.inc'
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include 'fasm\exprcalc.inc'
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include 'fasm\formats.inc'
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include 'fasm\x86_64.inc'
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include 'fasm\avx.inc'
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include 'fasm\tables.inc'
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include 'fasm\messages.inc'
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iglobal
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input_magic dd 55AA55AAh
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endg
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uglobal
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input_code dd ?
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input_size dd ?
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input_start dd ?
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input_stack dd ?
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output_size dd ?
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output_errs dd ?
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output_data rb 256
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include 'fasm\variable.inc'
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endg
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