formats.inc

一个用纯汇编 写的操作系统 源代码 是用 TASM 编译器写的

	jz	string_entries_processed
      process_string_entries:
	push	ecx
	mov	edx,edi
	sub	edx,[resource_data]
	bts	edx,31
	xchg	[esi],edx
	mov	ebx,edi
	xor	ax,ax
	stos	word [edi]
      copy_string_data:
	lea	eax,[edi+2]
	cmp	eax,[display_buffer]
	jae	out_of_memory
	mov	ax,[edx]
	or	ax,ax
	jz	string_data_copied
	stos	word [edi]
	inc	word [ebx]
	add	edx,2
	jmp	copy_string_data
      string_data_copied:
	add	esi,8
	pop	ecx
	loop	process_string_entries
      string_entries_processed:
	pop	esi
	cmp	esi,[esp]
	jb	make_name_strings
	mov	eax,edi
	sub	eax,[resource_data]
	test	al,11b
	jz	resource_strings_alignment_ok
	xor	ax,ax
	stos	word [edi]
      resource_strings_alignment_ok:
	pop	edx
	pop	ebx			; address of language directories
	mov	ebp,edi
      update_language_directories:
	add	ebx,10h
	movzx	eax,word [ebx-2]
	movzx	ecx,word [ebx-4]
	add	ecx,eax
      make_data_records:
	push	ecx
	mov	esi,edi
	sub	esi,[resource_data]
	xchg	esi,[ebx+4]
	lea	eax,[edi+16]
	cmp	eax,[display_buffer]
	jae	out_of_memory
	mov	eax,esi
	stos	dword [edi]
	mov	eax,[esi+12]
	stos	dword [edi]
	xor	eax,eax
	stos	dword [edi]
	stos	dword [edi]
	pop	ecx
	add	ebx,8
	loop	make_data_records
	cmp	ebx,edx
	jb	update_language_directories
	pop	ebx			; file handle
	mov	esi,ebp
	mov	ebp,edi
      update_data_records:
	push	ebp
	mov	ecx,edi
	mov	eax,[current_section]
	sub	ecx,[eax+14h]
	add	ecx,[eax+0Ch]
	xchg	ecx,[esi]
	mov	edx,[ecx]
	xor	al,al
	call	lseek
	mov	edx,edi
	mov	ecx,[esi+4]
	add	edi,ecx
	cmp	edi,[display_buffer]
	ja	out_of_memory
	call	read
	mov	eax,edi
	sub	eax,[resource_data]
	and	eax,11b
	jz	resource_data_alignment_ok
	mov	ecx,4
	sub	ecx,eax
	xor	al,al
	rep	stos byte [edi]
      resource_data_alignment_ok:
	pop	ebp
	add	esi,16
	cmp	esi,ebp
	jb	update_data_records
	pop	esi
	call	close
	mov	eax,edi
	sub	eax,[resource_data]
	mov	[resource_size],eax
      resource_done:
	ret
make_pe_fixups:
	bts	[resolver_flags],0
	jc	pe_relocatable_ok
	or	[next_pass_needed],-1
     pe_relocatable_ok:
	push	esi
	mov	ecx,[number_of_relocations]
	mov	esi,[free_additional_memory]
	mov	eax,ecx
	shl	eax,2
	sub	esi,eax
	mov	[free_additional_memory],esi
	or	[number_of_relocations],-1
	xor	edx,edx
	mov	ebp,edi
      make_fixups:
	cmp	[esi],edx
	jb	store_fixup
	mov	eax,edi
	sub	eax,ebp
	test	eax,11b
	jz	fixups_block
	xor	ax,ax
	stos	word [edi]
	add	dword [ebx],2
      fixups_block:
	mov	eax,edx
	add	edx,1000h
	cmp	[esi],edx
	jae	fixups_block
	stos	dword [edi]
	mov	ebx,edi
	mov	eax,8
	stos	dword [edi]
      store_fixup:
	jecxz	fixups_done
	add	dword [ebx],2
	mov	eax,[esi]
	and	ax,0FFFh
	test	[format_flags],8
	jnz	fixup_64bit
	or	ax,3000h
	jmp	fixup_ok
      fixup_64bit:
	or	ax,0A000h
      fixup_ok:
	stos	word [edi]
	add	esi,4
	loop	make_fixups
      fixups_done:
	pop	esi
	ret
close_pe:
	call	close_pe_section
	mov	edx,[code_start]
	mov	[edx+50h],eax
	call	make_timestamp
	mov	edx,[code_start]
	mov	[edx+8],eax
	mov	eax,[number_of_relocations]
	cmp	eax,-1
	je	pe_relocations_ok
	shl	eax,2
	sub	[free_additional_memory],eax
	btr	[resolver_flags],0
	jnc	pe_relocations_ok
	or	[next_pass_needed],-1
      pe_relocations_ok:
	mov	eax,[number_of_sections]
	mov	[edx+6],ax
	imul	eax,28h
	movzx	ecx,word [edx+14h]
	lea	eax,[eax+18h+ecx]
	add	eax,[stub_size]
	mov	ecx,[edx+3Ch]
	dec	ecx
	add	eax,ecx
	not	ecx
	and	eax,ecx
	cmp	eax,[edx+54h]
	je	pe_sections_ok
	or	[next_pass_needed],-1
      pe_sections_ok:
	xor	ecx,ecx
	add	edx,78h
	test	[format_flags],8
	jz	process_directories
	add	edx,10h
      process_directories:
	mov	eax,[edx+ecx*8]
	or	eax,eax
	jz	directory_ok
	cmp	dword [edx+ecx*8+4],-1
	jne	directory_ok
      section_data:
	mov	ebx,[edx+ecx*8]
	mov	eax,[ebx+0Ch]
	mov	[edx+ecx*8],eax 	; directory rva
	mov	eax,[ebx+8]
	mov	[edx+ecx*8+4],eax	; directory size
      directory_ok:
	inc	cl
	cmp	cl,10h
	jb	process_directories
	mov	ebx,[code_start]
	sub	ebx,[stub_size]
	mov	ecx,edi
	sub	ecx,ebx
	mov	ebp,ecx
	shr	ecx,1
	xor	eax,eax
	cdq
      calculate_checksum:
	mov	dx,[ebx]
	add	eax,edx
	mov	dx,ax
	shr	eax,16
	add	eax,edx
	add	ebx,2
	loop	calculate_checksum
	add	eax,ebp
	mov	ebx,[code_start]
	mov	[ebx+58h],eax
	ret

format_coff:
	mov	eax,[additional_memory]
	mov	[symbols_stream],eax
	mov	ebx,eax
	add	eax,20h
	cmp	eax,[structures_buffer]
	jae	out_of_memory
	mov	[free_additional_memory],eax
	xor	eax,eax
	mov	[ebx],al
	mov	[ebx+4],eax
	mov	[ebx+8],edi
	mov	al,4
	mov	[ebx+10h],eax
	mov	al,60h
	bt	[format_flags],0
	jnc	flat_section_flags_ok
	or	eax,0E0000000h
      flat_section_flags_ok:
	mov	dword [ebx+14h],eax
	mov	[current_section],ebx
	mov	[number_of_sections],0
	mov	dword [org_origin],edi
	mov	dword [org_origin+4],0
	mov	[org_registers],0
	mov	[org_start],edi
	mov	[org_symbol],ebx
	mov	[labels_type],2
	mov	[code_type],32
	test	[format_flags],8
	jz	instruction_assembled
	mov	[labels_type],4
	mov	[code_type],64
	jmp	instruction_assembled
coff_section:
	call	close_coff_section
	mov	ebx,[free_additional_memory]
	lea	eax,[ebx+20h]
	cmp	eax,[structures_buffer]
	jae	out_of_memory
	mov	[free_additional_memory],eax
	mov	[current_section],ebx
	inc	[number_of_sections]
	xor	eax,eax
	mov	[ebx],al
	mov	[ebx+8],edi
	mov	dword [org_origin],edi
	mov	dword [org_origin+4],0
	mov	[org_registers],0
	mov	[org_start],edi
	mov	[org_symbol],ebx
	mov	[labels_type],2
	test	[format_flags],8
	jz	coff_labels_type_ok
	mov	[labels_type],4
      coff_labels_type_ok:
	mov	[ebx+10h],eax
	mov	[ebx+14h],eax
	lods	word [esi]
	cmp	ax,'('
	jne	invalid_argument
	mov	[ebx+4],esi
	mov	ecx,[esi]
	lea	esi,[esi+4+ecx+1]
	cmp	ecx,8
	ja	name_too_long
      coff_section_flags:
	cmp	byte [esi],1Ch
	je	coff_section_alignment
	cmp	byte [esi],19h
	jne	coff_section_settings_ok
	inc	esi
	lods	byte [esi]
	bt	[format_flags],0
	jc	coff_section_flag_ok
	cmp	al,7
	ja	invalid_argument
      coff_section_flag_ok:
	mov	cl,al
	mov	eax,1
	shl	eax,cl
	test	dword [ebx+14h],eax
	jnz	setting_already_specified
	or	dword [ebx+14h],eax
	jmp	coff_section_flags
      coff_section_alignment:
	bt	[format_flags],0
	jnc	invalid_argument
	inc	esi
	lods	byte [esi]
	or	al,al
	jnz	invalid_argument
	lods	byte [esi]
	cmp	al,'('
	jne	invalid_argument
	cmp	byte [esi],'.'
	je	invalid_value
	push	ebx
	call	get_dword_value
	pop	ebx
	cmp	[value_type],0
	jne	invalid_use_of_symbol
	mov	edx,eax
	dec	edx
	test	eax,edx
	jnz	invalid_value
	or	eax,eax
	jz	invalid_value
	cmp	eax,2000h
	ja	invalid_value
	bsf	edx,eax
	inc	edx
	shl	edx,20
	or	[ebx+14h],edx
	xchg	[ebx+10h],eax
	or	eax,eax
	jnz	setting_already_specified
	jmp	coff_section_flags
      coff_section_settings_ok:
	cmp	dword [ebx+10h],0
	jne	instruction_assembled
	mov	dword [ebx+10h],4
	bt	[format_flags],0
	jnc	instruction_assembled
	or	dword [ebx+14h],300000h
	jmp	instruction_assembled
      close_coff_section:
	mov	ebx,[current_section]
	mov	eax,edi
	mov	edx,[ebx+8]
	sub	eax,edx
	mov	[ebx+0Ch],eax
	xor	eax,eax
	xchg	[undefined_data_end],eax
	cmp	eax,edi
	jne	coff_section_ok
	cmp	edx,[undefined_data_start]
	jne	coff_section_ok
	mov	edi,edx
	or	byte [ebx+14h],80h
      coff_section_ok:
	ret
mark_coff_relocation:
	cmp	[value_type],3
	je	coff_relocation_relative
	push	ebx eax
	test	[format_flags],8
	jnz	coff_64bit_relocation
	mov	al,6
	jmp	coff_relocation
      coff_64bit_relocation:
	mov	al,1
	cmp	[value_type],4
	je	coff_relocation
	mov	al,2
	jmp	coff_relocation
      coff_relocation_relative:
	push	ebx
	bt	[format_flags],0
	jnc	relative_ok
	mov	ebx,[current_section]
	mov	ebx,[ebx+8]
	sub	ebx,edi
	sub	eax,ebx
	add	eax,4
      relative_ok:
	push	eax
	mov	al,20
	test	[format_flags],8
	jnz	relative_coff_64bit_relocation
	cmp	[labels_type],2
	jne	invalid_use_of_symbol
	jmp	coff_relocation
      relative_coff_64bit_relocation:
	mov	al,4
	cmp	[labels_type],4
	jne	invalid_use_of_symbol
      coff_relocation:
	mov	ebx,[free_additional_memory]
	add	ebx,0Ch
	cmp	ebx,[structures_buffer]
	jae	out_of_memory
	mov	[free_additional_memory],ebx
	mov	byte [ebx-0Ch],al
	mov	eax,[current_section]
	mov	eax,[eax+8]
	neg	eax
	add	eax,edi
	mov	[ebx-0Ch+4],eax
	mov	eax,[symbol_identifier]
	mov	[ebx-0Ch+8],eax
	pop	eax ebx
	ret
close_coff:
	call	close_coff_section
	cmp	[next_pass_needed],0
	je	coff_closed
	mov	eax,[symbols_stream]
	mov	[free_additional_memory],eax
      coff_closed:
	ret
coff_formatter:
	sub	edi,[code_start]
	mov	[code_size],edi
	call	prepare_default_section
	mov	edi,[free_additional_memory]
	mov	ebx,edi
	mov	ecx,28h shr 2
	imul	ecx,[number_of_sections]
	add	ecx,14h shr 2
	lea	eax,[edi+ecx*4]
	cmp	eax,[structures_buffer]
	jae	out_of_memory
	xor	eax,eax
	rep	stos dword [edi]
	mov	word [ebx],14Ch
	test	[format_flags],8
	jz	coff_magic_ok
	mov	word [ebx],8664h
      coff_magic_ok:
	mov	word [ebx+12h],104h
	bt	[format_flags],0
	jnc	coff_flags_ok
	or	byte [ebx+12h],80h
      coff_flags_ok:
	push	ebx
	call	make_timestamp
	pop	ebx
	mov	[ebx+4],eax
	mov	eax,[number_of_sections]
	mov	[ebx+2],ax
	mov	esi,[symbols_stream]
	xor	eax,eax
	xor	ecx,ecx
      enumerate_symbols:
	cmp	esi,[free_additional_memory]
	je	symbols_enumerated
	mov	dl,[esi]
	or	dl,dl
	jz	enumerate_section
	cmp	dl,80h
	je	enumerate_public
	ja	enumerate_extrn
	add	esi,0Ch
	jmp	enumerate_symbols
      enumerate_section:
	mov	edx,eax
	shl	edx,8
	mov	[esi],edx
	inc	eax
	inc	ecx
	mov	[esi+1Eh],cx
	add	esi,20h
	jmp	enumerate_symbols
      enumerate_public:
	mov	edx,eax
	shl	edx,8
	mov	dl,80h
	mov	[esi],edx
	mov	edx,[esi+8]
	add	esi,10h
	inc	eax
	cmp	byte [edx+11],2
	jne	enumerate_symbols
	mov	edx,[edx+20]
	cmp	byte [edx],81h
	jne	enumerate_symbols
	inc	eax
	jmp	enumerate_symbols
      enumerate_extrn:
	mov	edx,eax
	shl	edx,8
	mov	dl,81h
	mov	[esi],edx
	add	esi,0Ch
	inc	eax
	jmp	enumerate_symbols
      prepare_default_section:
	mov	ebx,[symbols_stream]
	cmp	dword [ebx+0Ch],0
	jne	default_section_ok
	cmp	[number_of_sections],0
	je	default_section_ok
	mov	edx,ebx
      find_references_to_default_section:
	cmp	ebx,[free_additional_memory]
	jne	check_reference
	add	[symbols_stream],20h
	ret
      check_reference:
	mov	al,[ebx]
	or	al,al
	jz	skip_other_section
	cmp	al,80h
	je	check_public_reference
	ja	next_reference
	cmp	edx,[ebx+8]
	je	default_section_ok
      next_reference:
	add	ebx,0Ch
	jmp	find_references_to_default_section
      check_public_reference:
	mov	eax,[ebx+8]
	add	ebx,10h
	test	byte [eax+8],1
	jz	find_references_to_default_section
	mov	cx,[current_pass]
	cmp	cx,[eax+16]
	jne	find_references_to_default_section
	cmp	edx,[eax+20]
	je	default_section_ok
	jmp	find_references_to_default_section
      skip_other_section:
	add	ebx,20h
	jmp	find_references_to_default_section
      default_section_ok:
	inc	[number_of_sections]
	ret
      symbols_enumerated:
	mov	[ebx+0Ch],eax
	mov	ebp,edi
	sub	ebp,ebx
	push	ebp
	lea	edi,[ebx+14h]
	mov	esi,[symbols_stream]
      find_section:
	cmp	esi,[free_additional_memory]
	je	sections_finished
	mov	al,[esi]
	or	al,al
	jz	section_found
	add	esi,0Ch
	cmp	al,80h
	jne	find_section
	add	esi,4
	jmp	find_section
      section_found:
	push	esi edi
	mov	esi,[esi+4]
	or	esi,esi
	jz	default_section
	mov	ecx,[esi]
	add	esi,4
	rep	movs byte [edi],[esi]
	jmp	section_name_ok
      default_section:
	mov	al,'.'
	stos	byte [edi]
	mov	eax,'flat'
	stos	dword [edi]
      section_name_ok:
	pop	edi esi
	mov	eax,[esi+0Ch]
	mov	[edi+10h],eax
	mov	eax,[esi+14h]
	mov	[edi+24h],eax
	test	al,80h
	jnz	section_ptr_ok
	mov	eax,[esi+8]
	sub	eax,[code_start]
	add	eax,ebp
	mov	[edi+14h],eax
      section_ptr_ok:
	mov	ebx,[code_start]
	mov	edx,[code_size]
	add	ebx,edx
	add	edx,ebp
	xor	ecx,ecx
	add	esi,20h
      find_relocations:
	cmp	esi,[free_additional_memory]
	je	section_relocations_done
	mov	al,[esi]
	or	al,al
	jz	section_relocations_done
	cmp	al,80h
	jb	add_relocation
	ja	next_relocation
	add	esi,10h
	jmp	find_relocations
      add_relocation:
	lea	eax,[ebx+0Ah]
	cmp	eax,[display_buffer]
	ja	out_of_memory
	mov	eax,[esi+4]
	mov	[ebx],eax
	mov	eax,[esi+8]
	mov	eax,[eax]
	shr	eax,8
	mov	[ebx+4],eax
	movzx	ax,byte [esi]
	mov	[ebx+8],ax
	add	ebx,0Ah
	inc	ecx
      next_relocation:
	add	esi,0Ch
	jmp	find_relocations
      section_relocations_done:
	cmp	ecx,10000h
	jb	section_relocations_count_16bit
	bt	[format_flags],0
	jnc	format_limitations_exceeded
	mov	word [edi+20h],0FFFFh
	or	dword [edi+24h],1000000h
	mov	[edi+18h],edx
	push	esi edi
	push	ecx
	lea	esi,[ebx-1]
	add	ebx,0Ah
	lea	edi,[ebx-1]
	imul	ecx,0Ah
	std
	rep	movs byte [edi],[esi]
	cld
	pop	ecx
	inc	esi
	inc	ecx
	mov	[esi],ecx
	xor	eax,eax
	mov	[esi+4],eax