2273 lines
40 KiB
Plaintext
2273 lines
40 KiB
Plaintext
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; flat assembler core
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; Copyright (c) 1999-2022, Tomasz Grysztar.
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; All rights reserved.
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calculate_expression:
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mov [current_offset],edi
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mov [value_undefined],0
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cmp byte [esi],0
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je get_string_value
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cmp byte [esi],'.'
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je convert_fp
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calculation_loop:
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mov eax,[tagged_blocks]
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sub eax,0Ch
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cmp eax,edi
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jbe out_of_memory
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lods byte [esi]
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cmp al,1
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je get_byte_number
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cmp al,2
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je get_word_number
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cmp al,4
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je get_dword_number
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cmp al,8
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je get_qword_number
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cmp al,0Fh
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je value_out_of_range
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cmp al,10h
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je get_register
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cmp al,11h
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je get_label
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cmp al,')'
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je expression_calculated
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cmp al,']'
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je expression_calculated
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cmp al,'!'
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je invalid_expression
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sub edi,14h
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mov ebx,edi
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sub ebx,14h
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cmp al,0F0h
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je calculate_rva
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cmp al,0F1h
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je calculate_plt
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cmp al,0D0h
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je calculate_not
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cmp al,0E0h
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je calculate_bsf
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cmp al,0E1h
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je calculate_bsr
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cmp al,083h
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je calculate_neg
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mov dx,[ebx+8]
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or dx,[edi+8]
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cmp al,80h
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je calculate_add
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cmp al,81h
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je calculate_sub
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mov ah,[ebx+12]
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or ah,[edi+12]
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jz absolute_values_calculation
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call recoverable_misuse
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absolute_values_calculation:
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cmp al,90h
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je calculate_mul
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cmp al,91h
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je calculate_div
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or dx,dx
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jnz invalid_expression
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cmp al,0A0h
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je calculate_mod
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cmp al,0B0h
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je calculate_and
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cmp al,0B1h
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je calculate_or
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cmp al,0B2h
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je calculate_xor
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cmp al,0C0h
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je calculate_shl
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cmp al,0C1h
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je calculate_shr
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jmp invalid_expression
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expression_calculated:
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sub edi,14h
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cmp [value_undefined],0
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je expression_value_ok
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xor eax,eax
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mov [edi],eax
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mov [edi+4],eax
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mov [edi+12],eax
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expression_value_ok:
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ret
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get_byte_number:
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xor eax,eax
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lods byte [esi]
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stos dword [edi]
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xor al,al
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stos dword [edi]
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got_number:
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and word [edi-8+8],0
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and word [edi-8+12],0
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and dword [edi-8+16],0
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add edi,0Ch
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jmp calculation_loop
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get_word_number:
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xor eax,eax
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lods word [esi]
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stos dword [edi]
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xor ax,ax
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stos dword [edi]
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jmp got_number
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get_dword_number:
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movs dword [edi],[esi]
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xor eax,eax
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stos dword [edi]
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jmp got_number
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get_qword_number:
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movs dword [edi],[esi]
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movs dword [edi],[esi]
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jmp got_number
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get_register:
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mov byte [edi+9],0
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and word [edi+12],0
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lods byte [esi]
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mov [edi+8],al
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mov byte [edi+10],1
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xor eax,eax
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mov [edi+16],eax
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stos dword [edi]
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stos dword [edi]
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add edi,0Ch
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jmp calculation_loop
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get_label:
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xor eax,eax
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mov [edi+8],eax
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mov [edi+12],eax
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mov [edi+20],eax
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lods dword [esi]
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cmp eax,0Fh
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jb predefined_label
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je reserved_word_used_as_symbol
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mov ebx,eax
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mov ax,[current_pass]
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mov [ebx+18],ax
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mov cl,[ebx+9]
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shr cl,1
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and cl,1
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neg cl
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or byte [ebx+8],8
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test byte [ebx+8],1
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jz label_undefined
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cmp ax,[ebx+16]
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je unadjusted_label
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test byte [ebx+8],4
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jnz label_out_of_scope
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test byte [ebx+9],1
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jz unadjusted_label
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mov eax,[ebx]
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sub eax,dword [adjustment]
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stos dword [edi]
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mov eax,[ebx+4]
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sbb eax,dword [adjustment+4]
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stos dword [edi]
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sbb cl,[adjustment_sign]
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mov [edi-8+13],cl
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mov eax,dword [adjustment]
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or al,[adjustment_sign]
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or eax,dword [adjustment+4]
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jz got_label
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or [next_pass_needed],-1
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jmp got_label
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unadjusted_label:
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mov eax,[ebx]
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stos dword [edi]
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mov eax,[ebx+4]
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stos dword [edi]
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mov [edi-8+13],cl
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got_label:
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test byte [ebx+9],4
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jnz invalid_use_of_symbol
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call store_label_reference
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mov al,[ebx+11]
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mov [edi-8+12],al
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mov eax,[ebx+12]
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mov [edi-8+8],eax
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cmp al,ah
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jne labeled_registers_ok
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shr eax,16
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add al,ah
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jo labeled_registers_ok
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xor ah,ah
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mov [edi-8+10],ax
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mov [edi-8+9],ah
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labeled_registers_ok:
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mov eax,[ebx+20]
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mov [edi-8+16],eax
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add edi,0Ch
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mov al,[ebx+10]
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or al,al
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jz calculation_loop
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test [operand_flags],1
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jnz calculation_loop
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check_size:
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xchg [operand_size],al
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or al,al
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jz calculation_loop
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cmp al,[operand_size]
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jne operand_sizes_do_not_match
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jmp calculation_loop
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actual_file_offset_label:
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mov eax,[undefined_data_end]
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mov ebp,[addressing_space]
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test byte [ds:ebp+0Ah],1
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jnz use_undefined_data_offset
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cmp eax,[current_offset]
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jne use_current_offset
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use_undefined_data_offset:
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mov eax,[undefined_data_start]
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jmp make_file_offset_label
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current_file_offset_label:
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mov ebp,[addressing_space]
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test byte [ds:ebp+0Ah],1
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jz use_current_offset
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mov eax,[undefined_data_end]
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jmp make_file_offset_label
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use_current_offset:
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mov eax,[current_offset]
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make_file_offset_label:
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cmp [output_format],2
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jae invalid_use_of_symbol
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sub eax,[code_start]
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jmp make_dword_label_value
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current_offset_label:
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mov eax,[current_offset]
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make_current_offset_label:
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xor edx,edx
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xor ch,ch
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mov ebp,[addressing_space]
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sub eax,[ds:ebp]
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sbb edx,[ds:ebp+4]
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sbb ch,[ds:ebp+8]
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jp current_offset_label_ok
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call recoverable_overflow
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current_offset_label_ok:
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stos dword [edi]
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mov eax,edx
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stos dword [edi]
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mov eax,[ds:ebp+10h]
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stos dword [edi]
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mov cl,[ds:ebp+9]
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mov [edi-12+12],cx
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mov eax,[ds:ebp+14h]
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mov [edi-12+16],eax
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add edi,8
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jmp calculation_loop
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org_origin_label:
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mov eax,[addressing_space]
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mov eax,[eax+18h]
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jmp make_current_offset_label
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counter_label:
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mov eax,[counter]
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make_dword_label_value:
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stos dword [edi]
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xor eax,eax
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stos dword [edi]
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add edi,0Ch
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jmp calculation_loop
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timestamp_label:
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call make_timestamp
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make_qword_label_value:
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stos dword [edi]
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mov eax,edx
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stos dword [edi]
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add edi,0Ch
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jmp calculation_loop
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predefined_label:
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or eax,eax
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jz current_offset_label
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cmp eax,1
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je counter_label
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cmp eax,2
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je timestamp_label
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cmp eax,3
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je org_origin_label
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cmp eax,4
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je current_file_offset_label
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cmp eax,5
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je actual_file_offset_label
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mov edx,invalid_value
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jmp error_undefined
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label_out_of_scope:
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mov edx,symbol_out_of_scope
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jmp error_undefined
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label_undefined:
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mov edx,undefined_symbol
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error_undefined:
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cmp [current_pass],1
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ja undefined_value
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force_next_pass:
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or [next_pass_needed],-1
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undefined_value:
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or [value_undefined],-1
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and word [edi+12],0
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xor eax,eax
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stos dword [edi]
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stos dword [edi]
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add edi,0Ch
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cmp [error_line],0
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jne calculation_loop
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mov eax,[current_line]
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mov [error_line],eax
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mov [error],edx
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mov [error_info],ebx
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jmp calculation_loop
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calculate_add:
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xor ah,ah
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mov ah,[ebx+12]
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mov al,[edi+12]
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or al,al
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jz add_values
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or ah,ah
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jz add_relocatable
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add ah,al
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jnz invalid_add
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mov ecx,[edi+16]
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cmp ecx,[ebx+16]
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je add_values
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invalid_add:
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call recoverable_misuse
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jmp add_values
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add_relocatable:
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mov ah,al
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mov ecx,[edi+16]
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mov [ebx+16],ecx
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add_values:
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mov [ebx+12],ah
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mov eax,[edi]
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add [ebx],eax
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mov eax,[edi+4]
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adc [ebx+4],eax
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mov al,[edi+13]
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adc [ebx+13],al
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jp add_sign_ok
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call recoverable_overflow
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add_sign_ok:
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or dx,dx
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jz calculation_loop
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push esi
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mov esi,ebx
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mov cl,[edi+10]
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mov al,[edi+8]
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call add_register
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mov cl,[edi+11]
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mov al,[edi+9]
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call add_register
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pop esi
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jmp calculation_loop
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add_register:
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or al,al
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jz add_register_done
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add_register_start:
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cmp [esi+8],al
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jne add_in_second_slot
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add [esi+10],cl
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jo value_out_of_range
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jnz add_register_done
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mov byte [esi+8],0
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ret
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add_in_second_slot:
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cmp [esi+9],al
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jne create_in_first_slot
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add [esi+11],cl
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jo value_out_of_range
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jnz add_register_done
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mov byte [esi+9],0
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ret
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create_in_first_slot:
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cmp byte [esi+8],0
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jne create_in_second_slot
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mov [esi+8],al
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mov [esi+10],cl
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ret
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create_in_second_slot:
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cmp byte [esi+9],0
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jne invalid_expression
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mov [esi+9],al
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mov [esi+11],cl
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add_register_done:
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ret
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out_of_range:
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jmp calculation_loop
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calculate_sub:
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xor ah,ah
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mov ah,[ebx+12]
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mov al,[edi+12]
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or al,al
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jz sub_values
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or ah,ah
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jz negate_relocatable
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cmp al,ah
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jne invalid_sub
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xor ah,ah
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mov ecx,[edi+16]
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cmp ecx,[ebx+16]
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je sub_values
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invalid_sub:
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call recoverable_misuse
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jmp sub_values
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negate_relocatable:
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neg al
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mov ah,al
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mov ecx,[edi+16]
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mov [ebx+16],ecx
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sub_values:
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mov [ebx+12],ah
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mov eax,[edi]
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sub [ebx],eax
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mov eax,[edi+4]
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sbb [ebx+4],eax
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mov al,[edi+13]
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sbb [ebx+13],al
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jp sub_sign_ok
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cmp [error_line],0
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jne sub_sign_ok
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call recoverable_overflow
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sub_sign_ok:
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or dx,dx
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jz calculation_loop
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push esi
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mov esi,ebx
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mov cl,[edi+10]
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mov al,[edi+8]
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call sub_register
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mov cl,[edi+11]
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mov al,[edi+9]
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call sub_register
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pop esi
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jmp calculation_loop
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sub_register:
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or al,al
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jz add_register_done
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neg cl
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jo value_out_of_range
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jmp add_register_start
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calculate_mul:
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or dx,dx
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jz mul_start
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cmp word [ebx+8],0
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jne mul_start
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xor ecx,ecx
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swap_values:
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mov eax,[ebx+ecx]
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xchg eax,[edi+ecx]
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mov [ebx+ecx],eax
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add ecx,4
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cmp ecx,16
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jb swap_values
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mul_start:
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push esi edx
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mov esi,ebx
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xor bl,bl
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cmp byte [esi+13],0
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je mul_first_sign_ok
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xor bl,-1
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mov eax,[esi]
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mov edx,[esi+4]
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not eax
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not edx
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add eax,1
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adc edx,0
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mov [esi],eax
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mov [esi+4],edx
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or eax,edx
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jz mul_overflow
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mul_first_sign_ok:
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cmp byte [edi+13],0
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je mul_second_sign_ok
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xor bl,-1
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cmp byte [esi+8],0
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je mul_first_register_sign_ok
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neg byte [esi+10]
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jo invalid_expression
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mul_first_register_sign_ok:
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cmp byte [esi+9],0
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je mul_second_register_sign_ok
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neg byte [esi+11]
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jo invalid_expression
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mul_second_register_sign_ok:
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mov eax,[edi]
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mov edx,[edi+4]
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not eax
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not edx
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add eax,1
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adc edx,0
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mov [edi],eax
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mov [edi+4],edx
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or eax,edx
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jz mul_overflow
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mul_second_sign_ok:
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cmp dword [esi+4],0
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jz mul_numbers
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cmp dword [edi+4],0
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jz mul_numbers
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jnz mul_overflow
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mul_numbers:
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mov eax,[esi+4]
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mul dword [edi]
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or edx,edx
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jnz mul_overflow
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mov ecx,eax
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mov eax,[esi]
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mul dword [edi+4]
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or edx,edx
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jnz mul_overflow
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add ecx,eax
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jc mul_overflow
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mov eax,[esi]
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mul dword [edi]
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add edx,ecx
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jc mul_overflow
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mov [esi],eax
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mov [esi+4],edx
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or bl,bl
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jz mul_ok
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not eax
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not edx
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add eax,1
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adc edx,0
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mov [esi],eax
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mov [esi+4],edx
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or eax,edx
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jnz mul_ok
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not bl
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mul_ok:
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mov [esi+13],bl
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pop edx
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or dx,dx
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jz mul_calculated
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cmp word [edi+8],0
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jne invalid_value
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cmp byte [esi+8],0
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je mul_first_register_ok
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call get_byte_scale
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imul byte [esi+10]
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mov dl,ah
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cbw
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cmp ah,dl
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jne value_out_of_range
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mov [esi+10],al
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or al,al
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jnz mul_first_register_ok
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mov [esi+8],al
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mul_first_register_ok:
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cmp byte [esi+9],0
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je mul_calculated
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call get_byte_scale
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imul byte [esi+11]
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mov dl,ah
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cbw
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cmp ah,dl
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jne value_out_of_range
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mov [esi+11],al
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or al,al
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jnz mul_calculated
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mov [esi+9],al
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mul_calculated:
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pop esi
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jmp calculation_loop
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mul_overflow:
|
|
pop edx esi
|
|
call recoverable_overflow
|
|
jmp calculation_loop
|
|
get_byte_scale:
|
|
mov al,[edi]
|
|
cbw
|
|
cwde
|
|
cdq
|
|
cmp edx,[edi+4]
|
|
jne value_out_of_range
|
|
cmp eax,[edi]
|
|
jne value_out_of_range
|
|
ret
|
|
calculate_div:
|
|
push esi edx
|
|
mov esi,ebx
|
|
call div_64
|
|
pop edx
|
|
or dx,dx
|
|
jz div_calculated
|
|
cmp byte [esi+8],0
|
|
je div_first_register_ok
|
|
call get_byte_scale
|
|
or al,al
|
|
jz value_out_of_range
|
|
mov al,[esi+10]
|
|
cbw
|
|
idiv byte [edi]
|
|
or ah,ah
|
|
jnz invalid_use_of_symbol
|
|
mov [esi+10],al
|
|
div_first_register_ok:
|
|
cmp byte [esi+9],0
|
|
je div_calculated
|
|
call get_byte_scale
|
|
or al,al
|
|
jz value_out_of_range
|
|
mov al,[esi+11]
|
|
cbw
|
|
idiv byte [edi]
|
|
or ah,ah
|
|
jnz invalid_use_of_symbol
|
|
mov [esi+11],al
|
|
div_calculated:
|
|
pop esi
|
|
jmp calculation_loop
|
|
calculate_mod:
|
|
push esi
|
|
mov esi,ebx
|
|
call div_64
|
|
mov [esi],eax
|
|
mov [esi+4],edx
|
|
mov [esi+13],bh
|
|
pop esi
|
|
jmp calculation_loop
|
|
calculate_and:
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
mov cl,[edi+13]
|
|
and [ebx],eax
|
|
and [ebx+4],edx
|
|
and [ebx+13],cl
|
|
jmp calculation_loop
|
|
calculate_or:
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
mov cl,[edi+13]
|
|
or [ebx],eax
|
|
or [ebx+4],edx
|
|
or [ebx+13],cl
|
|
jmp calculation_loop
|
|
calculate_xor:
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
mov cl,[edi+13]
|
|
xor [ebx],eax
|
|
xor [ebx+4],edx
|
|
xor [ebx+13],cl
|
|
jmp calculation_loop
|
|
shr_negative:
|
|
mov byte [edi+13],0
|
|
not dword [edi]
|
|
not dword [edi+4]
|
|
add dword [edi],1
|
|
adc dword [edi+4],0
|
|
jc shl_over
|
|
calculate_shl:
|
|
cmp byte [edi+13],0
|
|
jne shl_negative
|
|
mov edx,[ebx+4]
|
|
mov eax,[ebx]
|
|
cmp dword [edi+4],0
|
|
jne shl_over
|
|
movsx ecx,byte [ebx+13]
|
|
xchg ecx,[edi]
|
|
cmp ecx,64
|
|
je shl_max
|
|
ja shl_over
|
|
cmp ecx,32
|
|
jae shl_high
|
|
shld [edi],edx,cl
|
|
shld edx,eax,cl
|
|
shl eax,cl
|
|
mov [ebx],eax
|
|
mov [ebx+4],edx
|
|
jmp shl_done
|
|
shl_over:
|
|
cmp byte [ebx+13],0
|
|
jne shl_overflow
|
|
shl_max:
|
|
movsx ecx,byte [ebx+13]
|
|
cmp eax,ecx
|
|
jne shl_overflow
|
|
cmp edx,ecx
|
|
jne shl_overflow
|
|
xor eax,eax
|
|
mov [ebx],eax
|
|
mov [ebx+4],eax
|
|
jmp calculation_loop
|
|
shl_high:
|
|
sub cl,32
|
|
shld [edi],edx,cl
|
|
shld edx,eax,cl
|
|
shl eax,cl
|
|
mov [ebx+4],eax
|
|
and dword [ebx],0
|
|
cmp edx,[edi]
|
|
jne shl_overflow
|
|
shl_done:
|
|
movsx eax,byte [ebx+13]
|
|
cmp eax,[edi]
|
|
je calculation_loop
|
|
shl_overflow:
|
|
call recoverable_overflow
|
|
jmp calculation_loop
|
|
shl_negative:
|
|
mov byte [edi+13],0
|
|
not dword [edi]
|
|
not dword [edi+4]
|
|
add dword [edi],1
|
|
adc dword [edi+4],0
|
|
jnc calculate_shr
|
|
dec dword [edi+4]
|
|
calculate_shr:
|
|
cmp byte [edi+13],0
|
|
jne shr_negative
|
|
mov edx,[ebx+4]
|
|
mov eax,[ebx]
|
|
cmp dword [edi+4],0
|
|
jne shr_over
|
|
mov ecx,[edi]
|
|
cmp ecx,64
|
|
jae shr_over
|
|
push esi
|
|
movsx esi,byte [ebx+13]
|
|
cmp ecx,32
|
|
jae shr_high
|
|
shrd eax,edx,cl
|
|
shrd edx,esi,cl
|
|
mov [ebx],eax
|
|
mov [ebx+4],edx
|
|
pop esi
|
|
jmp calculation_loop
|
|
shr_high:
|
|
sub cl,32
|
|
shrd edx,esi,cl
|
|
mov [ebx],edx
|
|
mov [ebx+4],esi
|
|
pop esi
|
|
jmp calculation_loop
|
|
shr_over:
|
|
movsx eax,byte [ebx+13]
|
|
mov dword [ebx],eax
|
|
mov dword [ebx+4],eax
|
|
jmp calculation_loop
|
|
calculate_not:
|
|
cmp word [edi+8],0
|
|
jne invalid_expression
|
|
cmp byte [edi+12],0
|
|
je not_ok
|
|
call recoverable_misuse
|
|
not_ok:
|
|
not dword [edi]
|
|
not dword [edi+4]
|
|
not byte [edi+13]
|
|
add edi,14h
|
|
jmp calculation_loop
|
|
calculate_bsf:
|
|
cmp word [edi+8],0
|
|
jne invalid_expression
|
|
cmp byte [edi+12],0
|
|
je bsf_ok
|
|
call recoverable_misuse
|
|
bsf_ok:
|
|
xor ecx,ecx
|
|
bsf eax,[edi]
|
|
jnz finish_bs
|
|
mov ecx,32
|
|
bsf eax,[edi+4]
|
|
jnz finish_bs
|
|
cmp byte [edi+13],0
|
|
jne finish_bs
|
|
bs_overflow:
|
|
call recoverable_overflow
|
|
add edi,14h
|
|
jmp calculation_loop
|
|
calculate_bsr:
|
|
cmp word [edi+8],0
|
|
jne invalid_expression
|
|
cmp byte [edi+12],0
|
|
je bsr_ok
|
|
call recoverable_misuse
|
|
bsr_ok:
|
|
cmp byte [edi+13],0
|
|
jne bs_overflow
|
|
mov ecx,32
|
|
bsr eax,[edi+4]
|
|
jnz finish_bs
|
|
xor ecx,ecx
|
|
bsr eax,[edi]
|
|
jz bs_overflow
|
|
finish_bs:
|
|
add eax,ecx
|
|
xor edx,edx
|
|
mov [edi],eax
|
|
mov [edi+4],edx
|
|
mov [edi+13],dl
|
|
add edi,14h
|
|
jmp calculation_loop
|
|
calculate_neg:
|
|
cmp byte [edi+8],0
|
|
je neg_first_register_ok
|
|
neg byte [edi+10]
|
|
jo invalid_expression
|
|
neg_first_register_ok:
|
|
cmp byte [edi+9],0
|
|
je neg_second_register_ok
|
|
neg byte [edi+11]
|
|
jo invalid_expression
|
|
neg_second_register_ok:
|
|
neg byte [edi+12]
|
|
xor eax,eax
|
|
xor edx,edx
|
|
xor cl,cl
|
|
xchg eax,[edi]
|
|
xchg edx,[edi+4]
|
|
xchg cl,[edi+13]
|
|
sub [edi],eax
|
|
sbb [edi+4],edx
|
|
sbb [edi+13],cl
|
|
jp neg_sign_ok
|
|
call recoverable_overflow
|
|
neg_sign_ok:
|
|
add edi,14h
|
|
jmp calculation_loop
|
|
calculate_rva:
|
|
cmp word [edi+8],0
|
|
jne invalid_expression
|
|
mov al,[output_format]
|
|
cmp al,5
|
|
je calculate_gotoff
|
|
cmp al,4
|
|
je calculate_coff_rva
|
|
cmp al,3
|
|
jne invalid_expression
|
|
test [format_flags],8
|
|
jnz pe64_rva
|
|
mov al,2
|
|
bt [resolver_flags],0
|
|
jc rva_type_ok
|
|
xor al,al
|
|
rva_type_ok:
|
|
cmp byte [edi+12],al
|
|
je rva_ok
|
|
call recoverable_misuse
|
|
rva_ok:
|
|
mov byte [edi+12],0
|
|
mov eax,[code_start]
|
|
mov eax,[eax+34h]
|
|
xor edx,edx
|
|
finish_rva:
|
|
sub [edi],eax
|
|
sbb [edi+4],edx
|
|
sbb byte [edi+13],0
|
|
jp rva_finished
|
|
call recoverable_overflow
|
|
rva_finished:
|
|
add edi,14h
|
|
jmp calculation_loop
|
|
pe64_rva:
|
|
mov al,4
|
|
bt [resolver_flags],0
|
|
jc pe64_rva_type_ok
|
|
xor al,al
|
|
pe64_rva_type_ok:
|
|
cmp byte [edi+12],al
|
|
je pe64_rva_ok
|
|
call recoverable_misuse
|
|
pe64_rva_ok:
|
|
mov byte [edi+12],0
|
|
mov eax,[code_start]
|
|
mov edx,[eax+34h]
|
|
mov eax,[eax+30h]
|
|
jmp finish_rva
|
|
calculate_gotoff:
|
|
test [format_flags],1
|
|
jnz calculate_elf_dyn_rva
|
|
test [format_flags],8
|
|
jnz invalid_expression
|
|
calculate_coff_rva:
|
|
mov dl,5
|
|
cmp byte [edi+12],2
|
|
je change_value_type
|
|
incorrect_change_of_value_type:
|
|
call recoverable_misuse
|
|
change_value_type:
|
|
mov byte [edi+12],dl
|
|
add edi,14h
|
|
jmp calculation_loop
|
|
calculate_elf_dyn_rva:
|
|
xor dl,dl
|
|
test byte [edi+12],1
|
|
jnz incorrect_change_of_value_type
|
|
jmp change_value_type
|
|
calculate_plt:
|
|
cmp word [edi+8],0
|
|
jne invalid_expression
|
|
cmp [output_format],5
|
|
jne invalid_expression
|
|
test [format_flags],1
|
|
jnz invalid_expression
|
|
mov dl,6
|
|
mov dh,2
|
|
test [format_flags],8
|
|
jz check_value_for_plt
|
|
mov dh,4
|
|
check_value_for_plt:
|
|
mov eax,[edi]
|
|
or eax,[edi+4]
|
|
jnz incorrect_change_of_value_type
|
|
cmp byte [edi+12],dh
|
|
jne incorrect_change_of_value_type
|
|
mov eax,[edi+16]
|
|
cmp byte [eax],80h
|
|
jne incorrect_change_of_value_type
|
|
jmp change_value_type
|
|
div_64:
|
|
xor ebx,ebx
|
|
cmp dword [edi],0
|
|
jne divider_ok
|
|
cmp dword [edi+4],0
|
|
jne divider_ok
|
|
cmp [next_pass_needed],0
|
|
je value_out_of_range
|
|
jmp div_done
|
|
divider_ok:
|
|
cmp byte [esi+13],0
|
|
je div_first_sign_ok
|
|
mov eax,[esi]
|
|
mov edx,[esi+4]
|
|
not eax
|
|
not edx
|
|
add eax,1
|
|
adc edx,0
|
|
mov [esi],eax
|
|
mov [esi+4],edx
|
|
or eax,edx
|
|
jz value_out_of_range
|
|
xor bx,-1
|
|
div_first_sign_ok:
|
|
cmp byte [edi+13],0
|
|
je div_second_sign_ok
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
not eax
|
|
not edx
|
|
add eax,1
|
|
adc edx,0
|
|
mov [edi],eax
|
|
mov [edi+4],edx
|
|
or eax,edx
|
|
jz value_out_of_range
|
|
xor bl,-1
|
|
div_second_sign_ok:
|
|
cmp dword [edi+4],0
|
|
jne div_high
|
|
mov ecx,[edi]
|
|
mov eax,[esi+4]
|
|
xor edx,edx
|
|
div ecx
|
|
mov [esi+4],eax
|
|
mov eax,[esi]
|
|
div ecx
|
|
mov [esi],eax
|
|
mov eax,edx
|
|
xor edx,edx
|
|
jmp div_done
|
|
div_high:
|
|
push ebx
|
|
mov eax,[esi+4]
|
|
xor edx,edx
|
|
div dword [edi+4]
|
|
mov ebx,[esi]
|
|
mov [esi],eax
|
|
and dword [esi+4],0
|
|
mov ecx,edx
|
|
mul dword [edi]
|
|
div_high_loop:
|
|
cmp ecx,edx
|
|
ja div_high_done
|
|
jb div_high_large_correction
|
|
cmp ebx,eax
|
|
jae div_high_done
|
|
div_high_correction:
|
|
dec dword [esi]
|
|
sub eax,[edi]
|
|
sbb edx,[edi+4]
|
|
jnc div_high_loop
|
|
div_high_done:
|
|
sub ebx,eax
|
|
sbb ecx,edx
|
|
mov edx,ecx
|
|
mov eax,ebx
|
|
pop ebx
|
|
jmp div_done
|
|
div_high_large_correction:
|
|
push eax edx
|
|
mov eax,edx
|
|
sub eax,ecx
|
|
xor edx,edx
|
|
div dword [edi+4]
|
|
shr eax,1
|
|
jz div_high_small_correction
|
|
sub [esi],eax
|
|
push eax
|
|
mul dword [edi+4]
|
|
sub dword [esp+4],eax
|
|
pop eax
|
|
mul dword [edi]
|
|
sub dword [esp+4],eax
|
|
sbb dword [esp],edx
|
|
pop edx eax
|
|
jmp div_high_loop
|
|
div_high_small_correction:
|
|
pop edx eax
|
|
jmp div_high_correction
|
|
div_done:
|
|
or bh,bh
|
|
jz remainder_ok
|
|
not eax
|
|
not edx
|
|
add eax,1
|
|
adc edx,0
|
|
mov ecx,eax
|
|
or ecx,edx
|
|
jnz remainder_ok
|
|
not bh
|
|
remainder_ok:
|
|
or bl,bl
|
|
jz div_ok
|
|
not dword [esi]
|
|
not dword [esi+4]
|
|
add dword [esi],1
|
|
adc dword [esi+4],0
|
|
mov ecx,[esi]
|
|
or ecx,[esi+4]
|
|
jnz div_ok
|
|
not bl
|
|
div_ok:
|
|
mov [esi+13],bl
|
|
ret
|
|
store_label_reference:
|
|
cmp [symbols_file],0
|
|
je label_reference_ok
|
|
cmp [next_pass_needed],0
|
|
jne label_reference_ok
|
|
mov eax,[tagged_blocks]
|
|
mov dword [eax-4],2
|
|
mov dword [eax-8],4
|
|
sub eax,8+4
|
|
cmp eax,edi
|
|
jbe out_of_memory
|
|
mov [tagged_blocks],eax
|
|
mov [eax],ebx
|
|
label_reference_ok:
|
|
ret
|
|
convert_fp:
|
|
inc esi
|
|
and word [edi+8],0
|
|
and word [edi+12],0
|
|
mov al,[value_size]
|
|
cmp al,2
|
|
je convert_fp_word
|
|
cmp al,4
|
|
je convert_fp_dword
|
|
test al,not 8
|
|
jz convert_fp_qword
|
|
call recoverable_misuse
|
|
convert_fp_qword:
|
|
xor eax,eax
|
|
xor edx,edx
|
|
cmp word [esi+8],8000h
|
|
je fp_qword_store
|
|
mov bx,[esi+8]
|
|
mov eax,[esi]
|
|
mov edx,[esi+4]
|
|
add eax,eax
|
|
adc edx,edx
|
|
mov ecx,edx
|
|
shr edx,12
|
|
shrd eax,ecx,12
|
|
jnc fp_qword_ok
|
|
add eax,1
|
|
adc edx,0
|
|
bt edx,20
|
|
jnc fp_qword_ok
|
|
and edx,1 shl 20 - 1
|
|
inc bx
|
|
shr edx,1
|
|
rcr eax,1
|
|
fp_qword_ok:
|
|
add bx,3FFh
|
|
cmp bx,7FFh
|
|
jge value_out_of_range
|
|
cmp bx,0
|
|
jg fp_qword_exp_ok
|
|
or edx,1 shl 20
|
|
mov cx,bx
|
|
neg cx
|
|
inc cx
|
|
cmp cx,52+1
|
|
ja value_out_of_range
|
|
cmp cx,32
|
|
jb fp_qword_small_shift
|
|
sub cx,32
|
|
mov eax,edx
|
|
xor edx,edx
|
|
shr eax,cl
|
|
jmp fp_qword_shift_done
|
|
fp_qword_small_shift:
|
|
mov ebx,edx
|
|
shr edx,cl
|
|
shrd eax,ebx,cl
|
|
fp_qword_shift_done:
|
|
mov bx,0
|
|
jnc fp_qword_exp_ok
|
|
add eax,1
|
|
adc edx,0
|
|
test edx,1 shl 20
|
|
jz fp_qword_exp_ok
|
|
and edx,1 shl 20 - 1
|
|
inc bx
|
|
fp_qword_exp_ok:
|
|
shl ebx,20
|
|
or edx,ebx
|
|
jnz fp_qword_store
|
|
or eax,eax
|
|
jz value_out_of_range
|
|
fp_qword_store:
|
|
mov bl,[esi+11]
|
|
shl ebx,31
|
|
or edx,ebx
|
|
mov [edi],eax
|
|
mov [edi+4],edx
|
|
add esi,13
|
|
ret
|
|
convert_fp_word:
|
|
xor eax,eax
|
|
cmp word [esi+8],8000h
|
|
je fp_word_store
|
|
mov bx,[esi+8]
|
|
mov ax,[esi+6]
|
|
shl ax,1
|
|
shr ax,6
|
|
jnc fp_word_ok
|
|
inc ax
|
|
bt ax,10
|
|
jnc fp_word_ok
|
|
and ax,1 shl 10 - 1
|
|
inc bx
|
|
shr ax,1
|
|
fp_word_ok:
|
|
add bx,0Fh
|
|
cmp bx,01Fh
|
|
jge value_out_of_range
|
|
cmp bx,0
|
|
jg fp_word_exp_ok
|
|
or ax,1 shl 10
|
|
mov cx,bx
|
|
neg cx
|
|
inc cx
|
|
cmp cx,10+1
|
|
ja value_out_of_range
|
|
xor bx,bx
|
|
shr ax,cl
|
|
jnc fp_word_exp_ok
|
|
inc ax
|
|
test ax,1 shl 10
|
|
jz fp_word_exp_ok
|
|
and ax,1 shl 10 - 1
|
|
inc bx
|
|
fp_word_exp_ok:
|
|
shl bx,10
|
|
or ax,bx
|
|
jz value_out_of_range
|
|
fp_word_store:
|
|
mov bl,[esi+11]
|
|
shl bx,15
|
|
or ax,bx
|
|
mov [edi],eax
|
|
xor eax,eax
|
|
mov [edi+4],eax
|
|
add esi,13
|
|
ret
|
|
convert_fp_dword:
|
|
xor eax,eax
|
|
cmp word [esi+8],8000h
|
|
je fp_dword_store
|
|
mov bx,[esi+8]
|
|
mov eax,[esi+4]
|
|
shl eax,1
|
|
shr eax,9
|
|
jnc fp_dword_ok
|
|
inc eax
|
|
bt eax,23
|
|
jnc fp_dword_ok
|
|
and eax,1 shl 23 - 1
|
|
inc bx
|
|
shr eax,1
|
|
fp_dword_ok:
|
|
add bx,7Fh
|
|
cmp bx,0FFh
|
|
jge value_out_of_range
|
|
cmp bx,0
|
|
jg fp_dword_exp_ok
|
|
or eax,1 shl 23
|
|
mov cx,bx
|
|
neg cx
|
|
inc cx
|
|
cmp cx,23+1
|
|
ja value_out_of_range
|
|
xor bx,bx
|
|
shr eax,cl
|
|
jnc fp_dword_exp_ok
|
|
inc eax
|
|
test eax,1 shl 23
|
|
jz fp_dword_exp_ok
|
|
and eax,1 shl 23 - 1
|
|
inc bx
|
|
fp_dword_exp_ok:
|
|
shl ebx,23
|
|
or eax,ebx
|
|
jz value_out_of_range
|
|
fp_dword_store:
|
|
mov bl,[esi+11]
|
|
shl ebx,31
|
|
or eax,ebx
|
|
mov [edi],eax
|
|
xor eax,eax
|
|
mov [edi+4],eax
|
|
add esi,13
|
|
ret
|
|
get_string_value:
|
|
inc esi
|
|
lods dword [esi]
|
|
mov ecx,eax
|
|
cmp ecx,8
|
|
ja value_out_of_range
|
|
mov edx,edi
|
|
xor eax,eax
|
|
stos dword [edi]
|
|
stos dword [edi]
|
|
mov edi,edx
|
|
rep movs byte [edi],[esi]
|
|
mov edi,edx
|
|
inc esi
|
|
and word [edi+8],0
|
|
and word [edi+12],0
|
|
ret
|
|
|
|
get_byte_value:
|
|
mov [value_size],1
|
|
or [operand_flags],1
|
|
call calculate_value
|
|
or al,al
|
|
jz check_byte_value
|
|
call recoverable_misuse
|
|
check_byte_value:
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
cmp byte [edi+13],0
|
|
je byte_positive
|
|
cmp edx,-1
|
|
jne range_exceeded
|
|
cmp eax,-100h
|
|
jb range_exceeded
|
|
ret
|
|
byte_positive:
|
|
test edx,edx
|
|
jnz range_exceeded
|
|
cmp eax,100h
|
|
jae range_exceeded
|
|
return_byte_value:
|
|
ret
|
|
range_exceeded:
|
|
xor eax,eax
|
|
xor edx,edx
|
|
recoverable_overflow:
|
|
cmp [error_line],0
|
|
jne ignore_overflow
|
|
push [current_line]
|
|
pop [error_line]
|
|
mov [error],value_out_of_range
|
|
or [value_undefined],-1
|
|
ignore_overflow:
|
|
ret
|
|
recoverable_misuse:
|
|
cmp [error_line],0
|
|
jne ignore_misuse
|
|
push [current_line]
|
|
pop [error_line]
|
|
mov [error],invalid_use_of_symbol
|
|
ignore_misuse:
|
|
ret
|
|
get_word_value:
|
|
mov [value_size],2
|
|
or [operand_flags],1
|
|
call calculate_value
|
|
cmp al,2
|
|
jb check_word_value
|
|
call recoverable_misuse
|
|
check_word_value:
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
cmp byte [edi+13],0
|
|
je word_positive
|
|
cmp edx,-1
|
|
jne range_exceeded
|
|
cmp eax,-10000h
|
|
jb range_exceeded
|
|
ret
|
|
word_positive:
|
|
test edx,edx
|
|
jnz range_exceeded
|
|
cmp eax,10000h
|
|
jae range_exceeded
|
|
ret
|
|
get_dword_value:
|
|
mov [value_size],4
|
|
or [operand_flags],1
|
|
call calculate_value
|
|
cmp al,4
|
|
jne check_dword_value
|
|
mov [value_type],2
|
|
mov eax,[edi]
|
|
cdq
|
|
cmp edx,[edi+4]
|
|
jne range_exceeded
|
|
mov ecx,edx
|
|
sar ecx,31
|
|
cmp cl,[value_sign]
|
|
jne range_exceeded
|
|
ret
|
|
check_dword_value:
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
cmp byte [edi+13],0
|
|
je dword_positive
|
|
cmp edx,-1
|
|
jne range_exceeded
|
|
ret
|
|
dword_positive:
|
|
test edx,edx
|
|
jne range_exceeded
|
|
ret
|
|
get_pword_value:
|
|
mov [value_size],6
|
|
or [operand_flags],1
|
|
call calculate_value
|
|
cmp al,4
|
|
jne check_pword_value
|
|
call recoverable_misuse
|
|
check_pword_value:
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
cmp byte [edi+13],0
|
|
je pword_positive
|
|
cmp edx,-10000h
|
|
jb range_exceeded
|
|
ret
|
|
pword_positive:
|
|
cmp edx,10000h
|
|
jae range_exceeded
|
|
ret
|
|
get_qword_value:
|
|
mov [value_size],8
|
|
or [operand_flags],1
|
|
call calculate_value
|
|
check_qword_value:
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
ret
|
|
get_count_value:
|
|
mov [value_size],8
|
|
or [operand_flags],1
|
|
call calculate_expression
|
|
cmp word [edi+8],0
|
|
jne invalid_value
|
|
mov [value_sign],0
|
|
mov al,[edi+12]
|
|
or al,al
|
|
jz check_count_value
|
|
call recoverable_misuse
|
|
check_count_value:
|
|
cmp byte [edi+13],0
|
|
jne invalid_count_value
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
or edx,edx
|
|
jnz invalid_count_value
|
|
ret
|
|
invalid_count_value:
|
|
cmp [error_line],0
|
|
jne zero_count
|
|
mov eax,[current_line]
|
|
mov [error_line],eax
|
|
mov [error],invalid_value
|
|
zero_count:
|
|
xor eax,eax
|
|
ret
|
|
get_value:
|
|
mov [operand_size],0
|
|
lods byte [esi]
|
|
call get_size_operator
|
|
cmp al,'('
|
|
jne invalid_value
|
|
mov al,[operand_size]
|
|
cmp al,1
|
|
je value_byte
|
|
cmp al,2
|
|
je value_word
|
|
cmp al,4
|
|
je value_dword
|
|
cmp al,6
|
|
je value_pword
|
|
cmp al,8
|
|
je value_qword
|
|
or al,al
|
|
jnz invalid_value
|
|
mov [value_size],al
|
|
call calculate_value
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
ret
|
|
calculate_value:
|
|
call calculate_expression
|
|
cmp word [edi+8],0
|
|
jne invalid_value
|
|
mov eax,[edi+16]
|
|
mov [symbol_identifier],eax
|
|
mov al,[edi+13]
|
|
mov [value_sign],al
|
|
mov al,[edi+12]
|
|
mov [value_type],al
|
|
ret
|
|
value_qword:
|
|
call get_qword_value
|
|
truncated_value:
|
|
mov [value_sign],0
|
|
ret
|
|
value_pword:
|
|
call get_pword_value
|
|
movzx edx,dx
|
|
jmp truncated_value
|
|
value_dword:
|
|
call get_dword_value
|
|
xor edx,edx
|
|
jmp truncated_value
|
|
value_word:
|
|
call get_word_value
|
|
xor edx,edx
|
|
movzx eax,ax
|
|
jmp truncated_value
|
|
value_byte:
|
|
call get_byte_value
|
|
xor edx,edx
|
|
movzx eax,al
|
|
jmp truncated_value
|
|
get_address_word_value:
|
|
mov [address_size],2
|
|
mov [value_size],2
|
|
mov [free_address_range],0
|
|
jmp calculate_address
|
|
get_address_dword_value:
|
|
mov [address_size],4
|
|
mov [value_size],4
|
|
mov [free_address_range],0
|
|
jmp calculate_address
|
|
get_address_qword_value:
|
|
mov [address_size],8
|
|
mov [value_size],8
|
|
mov [free_address_range],0
|
|
jmp calculate_address
|
|
get_address_value:
|
|
mov [address_size],0
|
|
mov [value_size],8
|
|
or [free_address_range],-1
|
|
calculate_address:
|
|
cmp byte [esi],'.'
|
|
je invalid_address
|
|
call calculate_expression
|
|
mov eax,[edi+16]
|
|
mov [address_symbol],eax
|
|
mov al,[edi+13]
|
|
mov [address_sign],al
|
|
mov al,[edi+12]
|
|
mov [value_type],al
|
|
cmp al,0
|
|
je address_size_ok
|
|
jg get_address_symbol_size
|
|
neg al
|
|
get_address_symbol_size:
|
|
cmp al,6
|
|
je special_address_type_32bit
|
|
cmp al,5
|
|
je special_address_type_32bit
|
|
ja invalid_address_type
|
|
test al,1
|
|
jnz invalid_address_type
|
|
shl al,5
|
|
jmp address_symbol_ok
|
|
invalid_address_type:
|
|
call recoverable_misuse
|
|
special_address_type_32bit:
|
|
mov al,40h
|
|
address_symbol_ok:
|
|
mov ah,[address_size]
|
|
or [address_size],al
|
|
shr al,4
|
|
or ah,ah
|
|
jz address_size_ok
|
|
cmp al,ah
|
|
je address_size_ok
|
|
cmp ax,0408h
|
|
je address_sizes_mixed
|
|
cmp ax,0804h
|
|
jne address_sizes_do_not_agree
|
|
address_sizes_mixed:
|
|
cmp [value_type],4
|
|
jne address_sizes_mixed_type_ok
|
|
mov [value_type],2
|
|
address_sizes_mixed_type_ok:
|
|
mov eax,[edi]
|
|
cdq
|
|
cmp edx,[edi+4]
|
|
je address_size_ok
|
|
cmp [error_line],0
|
|
jne address_size_ok
|
|
call recoverable_overflow
|
|
address_size_ok:
|
|
xor ebx,ebx
|
|
xor ecx,ecx
|
|
mov cl,[value_type]
|
|
shl ecx,16
|
|
mov ch,[address_size]
|
|
cmp word [edi+8],0
|
|
je check_immediate_address
|
|
mov al,[edi+8]
|
|
mov dl,[edi+10]
|
|
call get_address_register
|
|
mov al,[edi+9]
|
|
mov dl,[edi+11]
|
|
call get_address_register
|
|
mov ax,bx
|
|
shr ah,4
|
|
shr al,4
|
|
or bh,bh
|
|
jz check_address_registers
|
|
or bl,bl
|
|
jz check_address_registers
|
|
cmp al,ah
|
|
jne check_vsib
|
|
check_address_registers:
|
|
or al,ah
|
|
cmp al,0Ch
|
|
jae check_vsib
|
|
cmp al,6
|
|
je check_vsib
|
|
cmp al,7
|
|
je check_vsib
|
|
mov ah,[address_size]
|
|
and ah,0Fh
|
|
jz address_registers_sizes_ok
|
|
cmp al,ah
|
|
jne invalid_address
|
|
address_registers_sizes_ok:
|
|
cmp al,4
|
|
je sib_allowed
|
|
cmp al,8
|
|
je sib_allowed
|
|
cmp al,9
|
|
je check_ip_relative_address
|
|
cmp cl,1
|
|
ja invalid_address
|
|
cmp [free_address_range],0
|
|
jne check_qword_value
|
|
jmp check_word_value
|
|
address_sizes_do_not_match:
|
|
cmp al,0Fh
|
|
jne invalid_address
|
|
mov al,bh
|
|
and al,0Fh
|
|
cmp al,ah
|
|
jne invalid_address
|
|
check_ip_relative_address:
|
|
or bl,bl
|
|
jnz invalid_address
|
|
cmp bh,98h
|
|
je check_rip_relative_address
|
|
cmp bh,94h
|
|
jne invalid_address
|
|
cmp [free_address_range],0
|
|
je check_dword_value
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
ret
|
|
check_rip_relative_address:
|
|
mov eax,[edi]
|
|
cdq
|
|
cmp edx,[edi+4]
|
|
jne range_exceeded
|
|
cmp dl,[edi+13]
|
|
jne range_exceeded
|
|
ret
|
|
get_address_register:
|
|
or al,al
|
|
jz address_register_ok
|
|
cmp dl,1
|
|
jne scaled_register
|
|
or bh,bh
|
|
jnz scaled_register
|
|
mov bh,al
|
|
address_register_ok:
|
|
ret
|
|
scaled_register:
|
|
or bl,bl
|
|
jnz invalid_address
|
|
mov bl,al
|
|
mov cl,dl
|
|
jmp address_register_ok
|
|
sib_allowed:
|
|
or bh,bh
|
|
jnz check_index_with_base
|
|
cmp cl,3
|
|
je special_index_scale
|
|
cmp cl,5
|
|
je special_index_scale
|
|
cmp cl,9
|
|
je special_index_scale
|
|
cmp cl,2
|
|
jne check_index_scale
|
|
cmp bl,45h
|
|
jne special_index_scale
|
|
cmp [code_type],64
|
|
je special_index_scale
|
|
cmp [segment_register],4
|
|
jne special_index_scale
|
|
cmp [value_type],0
|
|
jne check_index_scale
|
|
mov al,[edi]
|
|
cbw
|
|
cwde
|
|
cmp eax,[edi]
|
|
jne check_index_scale
|
|
cdq
|
|
cmp edx,[edi+4]
|
|
jne check_immediate_address
|
|
special_index_scale:
|
|
mov bh,bl
|
|
dec cl
|
|
check_immediate_address:
|
|
cmp [free_address_range],0
|
|
jne check_qword_value
|
|
mov al,[address_size]
|
|
and al,0Fh
|
|
cmp al,2
|
|
je check_word_value
|
|
cmp al,4
|
|
je check_dword_value
|
|
cmp al,8
|
|
je check_qword_value
|
|
or al,al
|
|
jnz invalid_value
|
|
cmp [code_type],64
|
|
jne check_dword_value
|
|
jmp check_qword_value
|
|
check_index_with_base:
|
|
cmp cl,1
|
|
jne check_index_scale
|
|
cmp bl,44h
|
|
je swap_base_with_index
|
|
cmp bl,84h
|
|
je swap_base_with_index
|
|
cmp [code_type],64
|
|
je check_for_rbp_base
|
|
cmp bl,45h
|
|
jne check_for_ebp_base
|
|
cmp [segment_register],3
|
|
je swap_base_with_index
|
|
jmp check_immediate_address
|
|
check_for_ebp_base:
|
|
cmp bh,45h
|
|
jne check_immediate_address
|
|
cmp [segment_register],4
|
|
jne check_immediate_address
|
|
swap_base_with_index:
|
|
xchg bl,bh
|
|
jmp check_immediate_address
|
|
check_for_rbp_base:
|
|
cmp bh,45h
|
|
je swap_base_with_index
|
|
cmp bh,85h
|
|
je swap_base_with_index
|
|
jmp check_immediate_address
|
|
check_index_scale:
|
|
test cl,not 1111b
|
|
jnz invalid_address
|
|
mov al,cl
|
|
dec al
|
|
and al,cl
|
|
jz check_immediate_address
|
|
jmp invalid_address
|
|
check_vsib:
|
|
xor ah,ah
|
|
check_vsib_base:
|
|
test bh,bh
|
|
jz check_vsib_index
|
|
mov al,bh
|
|
shr al,4
|
|
cmp al,4
|
|
je check_vsib_base_size
|
|
cmp [code_type],64
|
|
jne swap_vsib_registers
|
|
cmp al,8
|
|
jne swap_vsib_registers
|
|
check_vsib_base_size:
|
|
mov ah,[address_size]
|
|
and ah,0Fh
|
|
jz check_vsib_index
|
|
cmp al,ah
|
|
jne invalid_address
|
|
check_vsib_index:
|
|
mov al,bl
|
|
and al,0E0h
|
|
cmp al,0C0h
|
|
jae check_index_scale
|
|
cmp al,60h
|
|
je check_index_scale
|
|
jmp invalid_address
|
|
swap_vsib_registers:
|
|
xor ah,-1
|
|
jz invalid_address
|
|
cmp cl,1
|
|
ja invalid_address
|
|
xchg bl,bh
|
|
mov cl,1
|
|
jmp check_vsib_base
|
|
|
|
calculate_relative_offset:
|
|
cmp [value_undefined],0
|
|
jne relative_offset_ok
|
|
test bh,bh
|
|
setne ch
|
|
cmp bx,[ds:ebp+10h]
|
|
je origin_registers_ok
|
|
xchg bh,bl
|
|
xchg ch,cl
|
|
cmp bx,[ds:ebp+10h]
|
|
jne invalid_value
|
|
origin_registers_ok:
|
|
cmp cx,[ds:ebp+10h+2]
|
|
jne invalid_value
|
|
mov bl,[address_sign]
|
|
add eax,[ds:ebp]
|
|
adc edx,[ds:ebp+4]
|
|
adc bl,[ds:ebp+8]
|
|
sub eax,edi
|
|
sbb edx,0
|
|
sbb bl,0
|
|
mov [value_sign],bl
|
|
mov bl,[value_type]
|
|
mov ecx,[address_symbol]
|
|
mov [symbol_identifier],ecx
|
|
test bl,1
|
|
jnz relative_offset_unallowed
|
|
cmp bl,6
|
|
je plt_relative_offset
|
|
mov bh,[ds:ebp+9]
|
|
cmp bl,bh
|
|
je set_relative_offset_type
|
|
cmp bx,0402h
|
|
je set_relative_offset_type
|
|
relative_offset_unallowed:
|
|
call recoverable_misuse
|
|
set_relative_offset_type:
|
|
cmp [value_type],0
|
|
je relative_offset_ok
|
|
mov [value_type],0
|
|
cmp ecx,[ds:ebp+14h]
|
|
je relative_offset_ok
|
|
mov [value_type],3
|
|
relative_offset_ok:
|
|
ret
|
|
plt_relative_offset:
|
|
mov [value_type],7
|
|
cmp byte [ds:ebp+9],2
|
|
je relative_offset_ok
|
|
cmp byte [ds:ebp+9],4
|
|
jne recoverable_misuse
|
|
ret
|
|
|
|
calculate_logical_expression:
|
|
xor al,al
|
|
calculate_embedded_logical_expression:
|
|
mov [logical_value_wrapping],al
|
|
call get_logical_value
|
|
logical_loop:
|
|
cmp byte [esi],'|'
|
|
je logical_or
|
|
cmp byte [esi],'&'
|
|
je logical_and
|
|
ret
|
|
logical_or:
|
|
inc esi
|
|
or al,al
|
|
jnz logical_value_already_determined
|
|
push eax
|
|
call get_logical_value
|
|
pop ebx
|
|
or al,bl
|
|
jmp logical_loop
|
|
logical_and:
|
|
inc esi
|
|
or al,al
|
|
jz logical_value_already_determined
|
|
push eax
|
|
call get_logical_value
|
|
pop ebx
|
|
and al,bl
|
|
jmp logical_loop
|
|
logical_value_already_determined:
|
|
push eax
|
|
call skip_logical_value
|
|
jc invalid_expression
|
|
pop eax
|
|
jmp logical_loop
|
|
get_value_for_comparison:
|
|
mov [value_size],8
|
|
or [operand_flags],1
|
|
lods byte [esi]
|
|
call calculate_expression
|
|
cmp byte [edi+8],0
|
|
jne first_register_size_ok
|
|
mov byte [edi+10],0
|
|
first_register_size_ok:
|
|
cmp byte [edi+9],0
|
|
jne second_register_size_ok
|
|
mov byte [edi+11],0
|
|
second_register_size_ok:
|
|
mov eax,[edi+16]
|
|
mov [symbol_identifier],eax
|
|
mov al,[edi+13]
|
|
mov [value_sign],al
|
|
mov bl,[edi+12]
|
|
mov eax,[edi]
|
|
mov edx,[edi+4]
|
|
mov ecx,[edi+8]
|
|
ret
|
|
get_logical_value:
|
|
xor al,al
|
|
check_for_negation:
|
|
cmp byte [esi],'~'
|
|
jne negation_ok
|
|
inc esi
|
|
xor al,-1
|
|
jmp check_for_negation
|
|
negation_ok:
|
|
push eax
|
|
mov al,[esi]
|
|
cmp al,91h
|
|
je logical_expression
|
|
cmp al,0FFh
|
|
je invalid_expression
|
|
cmp al,88h
|
|
je check_for_defined
|
|
cmp al,8Ah
|
|
je check_for_earlier_defined
|
|
cmp al,89h
|
|
je check_for_used
|
|
cmp al,'0'
|
|
je given_false
|
|
cmp al,'1'
|
|
je given_true
|
|
cmp al,'('
|
|
jne invalid_value
|
|
call get_value_for_comparison
|
|
mov bh,[value_sign]
|
|
push eax edx
|
|
push [symbol_identifier]
|
|
push ebx ecx
|
|
mov al,[esi]
|
|
or al,al
|
|
jz logical_number
|
|
cmp al,0Fh
|
|
je logical_number
|
|
cmp al,92h
|
|
je logical_number
|
|
cmp al,'&'
|
|
je logical_number
|
|
cmp al,'|'
|
|
je logical_number
|
|
inc esi
|
|
mov [compare_type],al
|
|
cmp byte [esi],'('
|
|
jne invalid_value
|
|
call get_value_for_comparison
|
|
cmp bl,[esp+4]
|
|
jne values_not_relative
|
|
or bl,bl
|
|
jz check_values_registers
|
|
mov ebx,[symbol_identifier]
|
|
cmp ebx,[esp+8]
|
|
jne values_not_relative
|
|
check_values_registers:
|
|
cmp ecx,[esp]
|
|
je values_relative
|
|
ror ecx,16
|
|
xchg ch,cl
|
|
ror ecx,16
|
|
xchg ch,cl
|
|
cmp ecx,[esp]
|
|
je values_relative
|
|
values_not_relative:
|
|
cmp [compare_type],0F8h
|
|
jne invalid_comparison
|
|
add esp,12+8
|
|
jmp return_false
|
|
invalid_comparison:
|
|
call recoverable_misuse
|
|
values_relative:
|
|
pop ebx
|
|
shl ebx,16
|
|
mov bx,[esp]
|
|
add esp,8
|
|
pop ecx ebp
|
|
cmp [compare_type],'='
|
|
je check_equal
|
|
cmp [compare_type],0F1h
|
|
je check_not_equal
|
|
cmp [compare_type],0F8h
|
|
je return_true
|
|
test ebx,0FFFF0000h
|
|
jz check_less_or_greater
|
|
call recoverable_misuse
|
|
check_less_or_greater:
|
|
cmp [compare_type],'>'
|
|
je check_greater
|
|
cmp [compare_type],'<'
|
|
je check_less
|
|
cmp [compare_type],0F2h
|
|
je check_not_less
|
|
cmp [compare_type],0F3h
|
|
je check_not_greater
|
|
jmp invalid_expression
|
|
check_equal:
|
|
cmp bh,[value_sign]
|
|
jne return_false
|
|
cmp eax,ebp
|
|
jne return_false
|
|
cmp edx,ecx
|
|
jne return_false
|
|
jmp return_true
|
|
check_greater:
|
|
cmp bh,[value_sign]
|
|
jg return_true
|
|
jl return_false
|
|
cmp edx,ecx
|
|
jb return_true
|
|
ja return_false
|
|
cmp eax,ebp
|
|
jb return_true
|
|
jae return_false
|
|
check_less:
|
|
cmp bh,[value_sign]
|
|
jg return_false
|
|
jl return_true
|
|
cmp edx,ecx
|
|
jb return_false
|
|
ja return_true
|
|
cmp eax,ebp
|
|
jbe return_false
|
|
ja return_true
|
|
check_not_less:
|
|
cmp bh,[value_sign]
|
|
jg return_true
|
|
jl return_false
|
|
cmp edx,ecx
|
|
jb return_true
|
|
ja return_false
|
|
cmp eax,ebp
|
|
jbe return_true
|
|
ja return_false
|
|
check_not_greater:
|
|
cmp bh,[value_sign]
|
|
jg return_false
|
|
jl return_true
|
|
cmp edx,ecx
|
|
jb return_false
|
|
ja return_true
|
|
cmp eax,ebp
|
|
jb return_false
|
|
jae return_true
|
|
check_not_equal:
|
|
cmp bh,[value_sign]
|
|
jne return_true
|
|
cmp eax,ebp
|
|
jne return_true
|
|
cmp edx,ecx
|
|
jne return_true
|
|
jmp return_false
|
|
logical_number:
|
|
pop ecx ebx eax edx eax
|
|
or bl,bl
|
|
jnz invalid_logical_number
|
|
or cx,cx
|
|
jz logical_number_ok
|
|
invalid_logical_number:
|
|
call recoverable_misuse
|
|
logical_number_ok:
|
|
test bh,bh
|
|
jnz return_true
|
|
or eax,edx
|
|
jnz return_true
|
|
jmp return_false
|
|
check_for_earlier_defined:
|
|
or bh,-1
|
|
jmp check_if_expression_defined
|
|
check_for_defined:
|
|
xor bh,bh
|
|
check_if_expression_defined:
|
|
or bl,-1
|
|
lods word [esi]
|
|
cmp ah,'('
|
|
jne invalid_expression
|
|
check_expression:
|
|
lods byte [esi]
|
|
or al,al
|
|
jz defined_string
|
|
cmp al,'.'
|
|
je defined_fp_value
|
|
cmp al,')'
|
|
je expression_checked
|
|
cmp al,'!'
|
|
je invalid_expression
|
|
cmp al,0Fh
|
|
je check_expression
|
|
cmp al,10h
|
|
je defined_register
|
|
cmp al,11h
|
|
je check_if_symbol_defined
|
|
cmp al,80h
|
|
jae check_expression
|
|
movzx eax,al
|
|
add esi,eax
|
|
jmp check_expression
|
|
defined_register:
|
|
inc esi
|
|
jmp check_expression
|
|
defined_fp_value:
|
|
add esi,12+1
|
|
jmp expression_checked
|
|
defined_string:
|
|
lods dword [esi]
|
|
add esi,eax
|
|
inc esi
|
|
jmp expression_checked
|
|
check_if_symbol_defined:
|
|
lods dword [esi]
|
|
cmp eax,-1
|
|
je invalid_expression
|
|
cmp eax,0Fh
|
|
jb check_expression
|
|
je reserved_word_used_as_symbol
|
|
test bh,bh
|
|
jnz no_prediction
|
|
test byte [eax+8],4
|
|
jnz no_prediction
|
|
test byte [eax+8],1
|
|
jz symbol_predicted_undefined
|
|
mov cx,[current_pass]
|
|
sub cx,[eax+16]
|
|
jz check_expression
|
|
cmp cx,1
|
|
ja symbol_predicted_undefined
|
|
or byte [eax+8],40h+80h
|
|
jmp check_expression
|
|
no_prediction:
|
|
test byte [eax+8],1
|
|
jz symbol_undefined
|
|
mov cx,[current_pass]
|
|
sub cx,[eax+16]
|
|
jz check_expression
|
|
jmp symbol_undefined
|
|
symbol_predicted_undefined:
|
|
or byte [eax+8],40h
|
|
and byte [eax+8],not 80h
|
|
symbol_undefined:
|
|
xor bl,bl
|
|
jmp check_expression
|
|
expression_checked:
|
|
mov al,bl
|
|
jmp logical_value_ok
|
|
check_for_used:
|
|
lods word [esi]
|
|
cmp ah,2
|
|
jne invalid_expression
|
|
lods dword [esi]
|
|
cmp eax,0Fh
|
|
jb invalid_use_of_symbol
|
|
je reserved_word_used_as_symbol
|
|
inc esi
|
|
test byte [eax+8],8
|
|
jz not_used
|
|
mov cx,[current_pass]
|
|
sub cx,[eax+18]
|
|
jz return_true
|
|
cmp cx,1
|
|
ja not_used
|
|
or byte [eax+8],10h+20h
|
|
jmp return_true
|
|
not_used:
|
|
or byte [eax+8],10h
|
|
and byte [eax+8],not 20h
|
|
jmp return_false
|
|
given_false:
|
|
inc esi
|
|
return_false:
|
|
xor al,al
|
|
jmp logical_value_ok
|
|
given_true:
|
|
inc esi
|
|
return_true:
|
|
or al,-1
|
|
jmp logical_value_ok
|
|
logical_expression:
|
|
lods byte [esi]
|
|
mov dl,[logical_value_wrapping]
|
|
push edx
|
|
call calculate_embedded_logical_expression
|
|
pop edx
|
|
mov [logical_value_wrapping],dl
|
|
push eax
|
|
lods byte [esi]
|
|
cmp al,92h
|
|
jne invalid_expression
|
|
pop eax
|
|
logical_value_ok:
|
|
pop ebx
|
|
xor al,bl
|
|
ret
|
|
|
|
skip_symbol:
|
|
lods byte [esi]
|
|
or al,al
|
|
jz nothing_to_skip
|
|
cmp al,0Fh
|
|
je nothing_to_skip
|
|
cmp al,1
|
|
je skip_instruction
|
|
cmp al,2
|
|
je skip_label
|
|
cmp al,3
|
|
je skip_label
|
|
cmp al,4
|
|
je skip_special_label
|
|
cmp al,20h
|
|
jb skip_assembler_symbol
|
|
cmp al,'('
|
|
je skip_expression
|
|
cmp al,'['
|
|
je skip_address
|
|
skip_done:
|
|
clc
|
|
ret
|
|
skip_label:
|
|
add esi,2
|
|
skip_instruction:
|
|
add esi,2
|
|
skip_assembler_symbol:
|
|
inc esi
|
|
jmp skip_done
|
|
skip_special_label:
|
|
add esi,4
|
|
jmp skip_done
|
|
skip_address:
|
|
mov al,[esi]
|
|
and al,11110000b
|
|
cmp al,60h
|
|
jb skip_expression
|
|
cmp al,70h
|
|
ja skip_expression
|
|
inc esi
|
|
jmp skip_address
|
|
skip_expression:
|
|
lods byte [esi]
|
|
or al,al
|
|
jz skip_string
|
|
cmp al,'.'
|
|
je skip_fp_value
|
|
cmp al,')'
|
|
je skip_done
|
|
cmp al,']'
|
|
je skip_done
|
|
cmp al,'!'
|
|
je skip_expression
|
|
cmp al,0Fh
|
|
je skip_expression
|
|
cmp al,10h
|
|
je skip_register
|
|
cmp al,11h
|
|
je skip_label_value
|
|
cmp al,80h
|
|
jae skip_expression
|
|
movzx eax,al
|
|
add esi,eax
|
|
jmp skip_expression
|
|
skip_label_value:
|
|
add esi,3
|
|
skip_register:
|
|
inc esi
|
|
jmp skip_expression
|
|
skip_fp_value:
|
|
add esi,12
|
|
jmp skip_done
|
|
skip_string:
|
|
lods dword [esi]
|
|
add esi,eax
|
|
inc esi
|
|
jmp skip_done
|
|
nothing_to_skip:
|
|
dec esi
|
|
stc
|
|
ret
|
|
|
|
expand_path:
|
|
lods byte [esi]
|
|
cmp al,'%'
|
|
je environment_variable
|
|
stos byte [edi]
|
|
or al,al
|
|
jnz expand_path
|
|
cmp edi,[memory_end]
|
|
ja out_of_memory
|
|
ret
|
|
environment_variable:
|
|
mov ebx,esi
|
|
find_variable_end:
|
|
lods byte [esi]
|
|
or al,al
|
|
jz not_environment_variable
|
|
cmp al,'%'
|
|
jne find_variable_end
|
|
mov byte [esi-1],0
|
|
push esi
|
|
mov esi,ebx
|
|
call get_environment_variable
|
|
pop esi
|
|
mov byte [esi-1],'%'
|
|
jmp expand_path
|
|
not_environment_variable:
|
|
mov al,'%'
|
|
stos byte [edi]
|
|
mov esi,ebx
|
|
jmp expand_path
|
|
get_include_directory:
|
|
lods byte [esi]
|
|
cmp al,';'
|
|
je include_directory_ok
|
|
stos byte [edi]
|
|
or al,al
|
|
jnz get_include_directory
|
|
dec esi
|
|
dec edi
|
|
include_directory_ok:
|
|
cmp byte [edi-1],'/'
|
|
je path_separator_ok
|
|
cmp byte [edi-1],'\'
|
|
je path_separator_ok
|
|
mov al,'/'
|
|
stos byte [edi]
|
|
path_separator_ok:
|
|
ret
|