;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2009. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 2288 $
DRV_COMPAT equ 5 ;minimal required drivers version
DRV_CURRENT equ 6 ;current drivers model version
DRV_VERSION equ (DRV_COMPAT shl 16) or DRV_CURRENT
PID_KERNEL equ 1 ;os_idle thread
align 4
proc get_notify stdcall, p_ev:dword
.wait:
mov ebx, [current_slot]
test dword [ebx+APPDATA.event_mask], EVENT_NOTIFY
jz @f
and dword [ebx+APPDATA.event_mask], not EVENT_NOTIFY
mov edi, [p_ev]
mov dword [edi], EV_INTR
mov eax, [ebx+APPDATA.event]
mov dword [edi+4], eax
ret
@@:
call change_task
jmp .wait
endp
align 4
proc pci_read32 stdcall, bus:dword, devfn:dword, reg:dword
push ebx
xor eax, eax
xor ebx, ebx
mov ah, byte [bus]
mov al, 6
mov bh, byte [devfn]
mov bl, byte [reg]
call pci_read_reg
pop ebx
ret
endp
align 4
proc pci_read16 stdcall, bus:dword, devfn:dword, reg:dword
push ebx
xor eax, eax
xor ebx, ebx
mov ah, byte [bus]
mov al, 5
mov bh, byte [devfn]
mov bl, byte [reg]
call pci_read_reg
pop ebx
ret
endp
align 4
proc pci_read8 stdcall, bus:dword, devfn:dword, reg:dword
push ebx
xor eax, eax
xor ebx, ebx
mov ah, byte [bus]
mov al, 4
mov bh, byte [devfn]
mov bl, byte [reg]
call pci_read_reg
pop ebx
ret
endp
align 4
proc pci_write8 stdcall, bus:dword, devfn:dword, reg:dword, val:dword
push ebx
xor eax, eax
xor ebx, ebx
mov ah, byte [bus]
mov al, 8
mov bh, byte [devfn]
mov bl, byte [reg]
mov ecx, [val]
call pci_write_reg
pop ebx
ret
endp
align 4
proc pci_write16 stdcall, bus:dword, devfn:dword, reg:dword, val:dword
push ebx
xor eax, eax
xor ebx, ebx
mov ah, byte [bus]
mov al, 9
mov bh, byte [devfn]
mov bl, byte [reg]
mov ecx, [val]
call pci_write_reg
pop ebx
ret
endp
align 4
proc pci_write32 stdcall, bus:dword, devfn:dword, reg:dword, val:dword
push ebx
xor eax, eax
xor ebx, ebx
mov ah, byte [bus]
mov al, 10
mov bh, byte [devfn]
mov bl, byte [reg]
mov ecx, [val]
call pci_write_reg
pop ebx
ret
endp
handle equ IOCTL.handle
io_code equ IOCTL.io_code
input equ IOCTL.input
inp_size equ IOCTL.inp_size
output equ IOCTL.output
out_size equ IOCTL.out_size
align 4
proc srv_handler stdcall, ioctl:dword
mov esi, [ioctl]
test esi, esi
jz .err
mov edi, [esi+handle]
cmp [edi+SRV.magic], ' SRV'
jne .fail
cmp [edi+SRV.size], SRV.sizeof
jne .fail
stdcall [edi+SRV.srv_proc], esi
ret
.fail:
xor eax, eax
not eax
mov [esi+output], eax
mov [esi+out_size], 4
ret
.err:
xor eax, eax
not eax
ret
endp
; param
; ecx= io_control
;
; retval
; eax= error code
align 4
srv_handlerEx:
cmp ecx, OS_BASE
jae .fail
mov eax, [ecx+handle]
cmp [eax+SRV.magic], ' SRV'
jne .fail
cmp [eax+SRV.size], SRV.sizeof
jne .fail
stdcall [eax+SRV.srv_proc], ecx
ret
.fail:
or eax, -1
ret
restore handle
restore io_code
restore input
restore inp_size
restore output
restore out_size
align 4
proc get_service stdcall, sz_name:dword
mov eax, [sz_name]
test eax, eax
jnz @F
ret
@@:
mov edx, [srv.fd]
@@:
cmp edx, srv.fd-SRV_FD_OFFSET
je .not_load
stdcall strncmp, edx, [sz_name], 16
test eax, eax
je .ok
mov edx, [edx+SRV.fd]
jmp @B
.not_load:
pop ebp
jmp load_driver
.ok:
mov eax, edx
ret
endp
align 4
proc reg_service stdcall, name:dword, handler:dword
push ebx
xor eax, eax
cmp [name], eax
je .fail
cmp [handler], eax
je .fail
mov eax, SRV.sizeof
call malloc
test eax, eax
jz .fail
push esi
push edi
mov edi, eax
mov esi, [name]
movsd
movsd
movsd
movsd
pop edi
pop esi
mov [eax+SRV.magic], ' SRV'
mov [eax+SRV.size], SRV.sizeof
mov ebx, srv.fd-SRV_FD_OFFSET
mov edx, [ebx+SRV.fd]
mov [eax+SRV.fd], edx
mov [eax+SRV.bk], ebx
mov [ebx+SRV.fd], eax
mov [edx+SRV.bk], eax
mov ecx, [handler]
mov [eax+SRV.srv_proc], ecx
pop ebx
ret
.fail:
xor eax, eax
pop ebx
ret
endp
align 4
proc get_proc stdcall, exp:dword, sz_name:dword
mov edx, [exp]
.next:
mov eax, [edx]
test eax, eax
jz .end
push edx
stdcall strncmp, eax, [sz_name], 16
pop edx
test eax, eax
jz .ok
add edx, 8
jmp .next
.ok:
mov eax, [edx+4]
.end:
ret
endp
align 4
proc get_coff_sym stdcall, pSym:dword,count:dword, sz_sym:dword
@@:
stdcall strncmp, [pSym], [sz_sym], 8
test eax, eax
jz .ok
add [pSym], 18
dec [count]
jnz @b
xor eax, eax
ret
.ok:
mov eax, [pSym]
mov eax, [eax+8]
ret
endp
align 4
proc get_curr_task
mov eax, [CURRENT_TASK]
shl eax, 8
ret
endp
align 4
proc get_fileinfo stdcall, file_name:dword, info:dword
locals
cmd dd ?
offset dd ?
dd ?
count dd ?
buff dd ?
db ?
name dd ?
endl
xor eax, eax
mov ebx, [file_name]
mov ecx, [info]
mov [cmd], 5
mov [offset], eax
mov [offset+4], eax
mov [count], eax
mov [buff], ecx
mov byte [buff+4], al
mov [name], ebx
mov eax, 70
lea ebx, [cmd]
int 0x40
ret
endp
align 4
proc read_file stdcall,file_name:dword, buffer:dword, off:dword,\
bytes:dword
locals
cmd dd ?
offset dd ?
dd ?
count dd ?
buff dd ?
db ?
name dd ?
endl
xor eax, eax
mov ebx, [file_name]
mov ecx, [off]
mov edx, [bytes]
mov esi, [buffer]
mov [cmd], eax
mov [offset], ecx
mov [offset+4], eax
mov [count], edx
mov [buff], esi
mov byte [buff+4], al
mov [name], ebx
pushad
lea ebx, [cmd]
call file_system_lfn
popad
ret
endp
; description
; allocate kernel memory and loads the specified file
;
; param
; file_name= full path to file
;
; retval
; eax= file image in kernel memory
; ebx= size of file
;
; warging
; You mast call kernel_free() to delete each file
; loaded by the load_file() function
align 4
proc load_file stdcall, file_name:dword
locals
attr dd ?
flags dd ?
cr_time dd ?
cr_date dd ?
acc_time dd ?
acc_date dd ?
mod_time dd ?
mod_date dd ?
file_size dd ?
file dd ?
file2 dd ?
endl
push esi
push edi
lea eax, [attr]
stdcall get_fileinfo, [file_name], eax
test eax, eax
jnz .fail
mov eax, [file_size]
cmp eax, 1024*1024*16
ja .fail
stdcall kernel_alloc, [file_size]
mov [file], eax
test eax, eax
jz .fail
stdcall read_file, [file_name], eax, dword 0, [file_size]
cmp ebx, [file_size]
jne .cleanup
mov eax, [file]
cmp dword [eax], 0x4B43504B
jne .exit
mov ebx, [eax+4]
mov [file_size], ebx
stdcall kernel_alloc, ebx
test eax, eax
jz .cleanup
mov [file2], eax
pushfd
cli
stdcall unpack, [file], eax
popfd
stdcall kernel_free, [file]
mov eax, [file2]
mov ebx, [file_size]
.exit:
push eax
lea edi, [eax+ebx] ;cleanup remain space
mov ecx, 4096 ;from file end
and ebx, 4095
jz @f
sub ecx, ebx
xor eax, eax
cld
rep stosb
@@:
mov ebx, [file_size]
pop eax
pop edi
pop esi
ret
.cleanup:
stdcall kernel_free, [file]
.fail:
xor eax, eax
xor ebx, ebx
pop edi
pop esi
ret
endp
align 4
proc get_proc_ex stdcall, proc_name:dword, imports:dword
.look_up:
mov edx, [imports]
test edx, edx
jz .end
mov edx, [edx]
test edx, edx
jz .end
.next:
mov eax, [edx]
test eax, eax
jz .next_table
push edx
stdcall strncmp, eax, [proc_name], 256
pop edx
test eax, eax
jz .ok
add edx, 8
jmp .next
.next_table:
add [imports], 4
jmp .look_up
.ok:
mov eax, [edx+4]
ret
.end:
xor eax, eax
ret
endp
align 4
proc fix_coff_symbols stdcall uses ebx esi, sec:dword, symbols:dword,\
sym_count:dword, strings:dword, imports:dword
locals
retval dd ?
endl
mov edi, [symbols]
mov [retval], 1
.fix:
movzx ebx, [edi+CSYM.SectionNumber]
test ebx, ebx
jnz .internal
mov eax, dword [edi+CSYM.Name]
test eax, eax
jnz @F
mov edi, [edi+4]
add edi, [strings]
@@:
push edi
stdcall get_proc_ex, edi, [imports]
pop edi
xor ebx, ebx
test eax, eax
jnz @F
mov esi, msg_unresolved
call sys_msg_board_str
mov esi, edi
call sys_msg_board_str
mov esi, msg_CR
call sys_msg_board_str
mov [retval], 0
@@:
mov edi, [symbols]
mov [edi+CSYM.Value], eax
jmp .next
.internal:
cmp bx, -1
je .next
cmp bx, -2
je .next
dec ebx
shl ebx, 3
lea ebx, [ebx+ebx*4]
add ebx, [sec]
mov eax, [ebx+CFS.VirtualAddress]
add [edi+CSYM.Value], eax
.next:
add edi, CSYM_SIZE
mov [symbols], edi
dec [sym_count]
jnz .fix
mov eax, [retval]
ret
endp
align 4
proc fix_coff_relocs stdcall uses ebx esi, coff:dword, sym:dword, \
delta:dword
locals
n_sec dd ?
endl
mov eax, [coff]
movzx ebx, [eax+CFH.nSections]
mov [n_sec], ebx
lea esi, [eax+20]
.fix_sec:
mov edi, [esi+CFS.PtrReloc]
add edi, [coff]
movzx ecx, [esi+CFS.NumReloc]
test ecx, ecx
jz .next
.reloc_loop:
mov ebx, [edi+CRELOC.SymIndex]
add ebx, ebx
lea ebx, [ebx+ebx*8]
add ebx, [sym]
mov edx, [ebx+CSYM.Value]
cmp [edi+CRELOC.Type], 6
je .dir_32
cmp [edi+CRELOC.Type], 20
jne .next_reloc
.rel_32:
mov eax, [edi+CRELOC.VirtualAddress]
add eax, [esi+CFS.VirtualAddress]
sub edx, eax
sub edx, 4
jmp .fix
.dir_32:
mov eax, [edi+CRELOC.VirtualAddress]
add eax, [esi+CFS.VirtualAddress]
.fix:
add eax, [delta]
add [eax], edx
.next_reloc:
add edi, 10
dec ecx
jnz .reloc_loop
.next:
add esi, COFF_SECTION_SIZE
dec [n_sec]
jnz .fix_sec
.exit:
ret
endp
align 4
proc rebase_coff stdcall uses ebx esi, coff:dword, sym:dword, \
delta:dword
locals
n_sec dd ?
endl
mov eax, [coff]
movzx ebx, [eax+CFH.nSections]
mov [n_sec], ebx
lea esi, [eax+20]
mov edx, [delta]
.fix_sec:
mov edi, [esi+CFS.PtrReloc]
add edi, [coff]
movzx ecx, [esi+CFS.NumReloc]
test ecx, ecx
jz .next
.reloc_loop:
cmp [edi+CRELOC.Type], 6
jne .next_reloc
.dir_32:
mov eax, [edi+CRELOC.VirtualAddress]
add eax, [esi+CFS.VirtualAddress]
add [eax+edx], edx
.next_reloc:
add edi, 10
dec ecx
jnz .reloc_loop
.next:
add esi, COFF_SECTION_SIZE
dec [n_sec]
jnz .fix_sec
.exit:
ret
endp
align 4
proc load_driver stdcall, driver_name:dword
locals
coff dd ?
sym dd ?
strings dd ?
img_size dd ?
img_base dd ?
start dd ?
exports dd ? ;fake exports table
dd ?
file_name rb 13+16+4+1 ; '/sys/drivers/<up-to-16-chars>.obj'
endl
lea edx, [file_name]
mov dword [edx], '/sys'
mov dword [edx+4], '/dri'
mov dword [edx+8], 'vers'
mov byte [edx+12], '/'
mov esi, [driver_name]
.redo:
lea edx, [file_name]
lea edi, [edx+13]
mov ecx, 16
@@:
lodsb
test al, al
jz @f
stosb
loop @b
@@:
mov dword [edi], '.obj'
mov byte [edi+4], 0
stdcall load_file, edx
test eax, eax
jz .exit
mov [coff], eax
movzx ecx, [eax+CFH.nSections]
xor ebx, ebx
lea edx, [eax+20]
@@:
add ebx, [edx+CFS.SizeOfRawData]
add ebx, 15
and ebx, not 15
add edx, COFF_SECTION_SIZE
dec ecx
jnz @B
mov [img_size], ebx
stdcall kernel_alloc, ebx
test eax, eax
jz .fail
mov [img_base], eax
mov edi, eax
xor eax, eax
mov ecx, [img_size]
add ecx, 4095
and ecx, not 4095
shr ecx, 2
cld
rep stosd
mov edx, [coff]
movzx ebx, [edx+CFH.nSections]
mov edi, [img_base]
lea eax, [edx+20]
@@:
mov [eax+CFS.VirtualAddress], edi
mov esi, [eax+CFS.PtrRawData]
test esi, esi
jnz .copy
add edi, [eax+CFS.SizeOfRawData]
jmp .next
.copy:
add esi, edx
mov ecx, [eax+CFS.SizeOfRawData]
cld
rep movsb
.next:
add edi, 15
and edi, not 15
add eax, COFF_SECTION_SIZE
dec ebx
jnz @B
mov ebx, [edx+CFH.pSymTable]
add ebx, edx
mov [sym], ebx
mov ecx, [edx+CFH.nSymbols]
add ecx, ecx
lea ecx, [ecx+ecx*8];ecx*=18 = nSymbols*CSYM_SIZE
add ecx, [sym]
mov [strings], ecx
lea ebx, [exports]
mov dword [ebx], kernel_export
mov dword [ebx+4], 0
lea eax, [edx+20]
stdcall fix_coff_symbols, eax, [sym], [edx+CFH.nSymbols], \
[strings], ebx
test eax, eax
jz .link_fail
mov ebx, [coff]
stdcall fix_coff_relocs, ebx, [sym], 0
stdcall get_coff_sym, [sym], [ebx+CFH.nSymbols], szVersion
test eax, eax
jz .link_fail
mov eax, [eax]
shr eax, 16
cmp eax, DRV_COMPAT
jb .ver_fail
cmp eax, DRV_CURRENT
ja .ver_fail
mov ebx, [coff]
stdcall get_coff_sym, [sym], [ebx+CFH.nSymbols], szSTART
mov [start], eax
stdcall kernel_free, [coff]
mov ebx, [start]
stdcall ebx, DRV_ENTRY
test eax, eax
jnz .ok
stdcall kernel_free, [img_base]
cmp dword [file_name+13], 'SOUN'
jnz @f
cmp dword [file_name+17], 'D.ob'
jnz @f
cmp word [file_name+21], 'j'
jnz @f
mov esi, aSis
jmp .redo
@@:
xor eax, eax
ret
.ok:
mov ebx, [img_base]
mov [eax+SRV.base], ebx
mov ecx, [start]
mov [eax+SRV.entry], ecx
ret
.ver_fail:
mov esi, msg_CR
call sys_msg_board_str
mov esi, [driver_name]
call sys_msg_board_str
mov esi, msg_CR
call sys_msg_board_str
mov esi, msg_version
call sys_msg_board_str
mov esi, msg_www
call sys_msg_board_str
jmp .cleanup
.link_fail:
mov esi, msg_module
call sys_msg_board_str
mov esi, [driver_name]
call sys_msg_board_str
mov esi, msg_CR
call sys_msg_board_str
.cleanup:
stdcall kernel_free, [img_base]
.fail:
stdcall kernel_free, [coff]
.exit:
xor eax, eax
ret
endp
; in: edx -> COFF_SECTION struct
; out: eax = alignment as mask for bits to drop
coff_get_align:
; Rules:
; - if alignment is not given, use default = 4K;
; - if alignment is given and is no more than 4K, use it;
; - if alignment is more than 4K, revert to 4K.
push ecx
mov cl, byte [edx+CFS.Characteristics+2]
mov eax, 1
shr cl, 4
dec cl
js .default
cmp cl, 12
jbe @f
.default:
mov cl, 12
@@:
shl eax, cl
pop ecx
dec eax
ret
align 4
proc load_library stdcall, file_name:dword
locals
fullname rb 260
fileinfo rb 40
coff dd ?
img_base dd ?
endl
cli
; resolve file name
mov ebx, [file_name]
lea edi, [fullname+1]
mov byte [edi-1], '/'
stdcall get_full_file_name, edi, 259
test al, al
jz .fail
; scan for required DLL in list of already loaded for this process,
; ignore timestamp
mov esi, [CURRENT_TASK]
shl esi, 8
lea edi, [fullname]
mov ebx, [esi+SLOT_BASE+APPDATA.dlls_list_ptr]
test ebx, ebx
jz .not_in_process
mov esi, [ebx+HDLL.fd]
.scan_in_process:
cmp esi, ebx
jz .not_in_process
mov eax, [esi+HDLL.parent]
add eax, DLLDESCR.name
stdcall strncmp, eax, edi, -1
test eax, eax
jnz .next_in_process
; simple variant: load DLL which is already loaded in this process
; just increment reference counters and return address of exports table
inc [esi+HDLL.refcount]
mov ecx, [esi+HDLL.parent]
inc [ecx+DLLDESCR.refcount]
mov eax, [ecx+DLLDESCR.exports]
sub eax, [ecx+DLLDESCR.defaultbase]
add eax, [esi+HDLL.base]
ret
.next_in_process:
mov esi, [esi+HDLL.fd]
jmp .scan_in_process
.not_in_process:
; scan in full list, compare timestamp
lea eax, [fileinfo]
stdcall get_fileinfo, edi, eax
test eax, eax
jnz .fail
mov esi, [dll_list.fd]
.scan_for_dlls:
cmp esi, dll_list
jz .load_new
lea eax, [esi+DLLDESCR.name]
stdcall strncmp, eax, edi, -1
test eax, eax
jnz .continue_scan
.test_prev_dll:
mov eax, dword [fileinfo+24]; last modified time
mov edx, dword [fileinfo+28]; last modified date
cmp dword [esi+DLLDESCR.timestamp], eax
jnz .continue_scan
cmp dword [esi+DLLDESCR.timestamp+4], edx
jz .dll_already_loaded
.continue_scan:
mov esi, [esi+DLLDESCR.fd]
jmp .scan_for_dlls
; new DLL
.load_new:
; load file
stdcall load_file, edi
test eax, eax
jz .fail
mov [coff], eax
mov dword [fileinfo+32], ebx
; allocate DLLDESCR struct; size is DLLDESCR.sizeof plus size of DLL name
mov esi, edi
mov ecx, -1
xor eax, eax
repnz scasb
not ecx
lea eax, [ecx+DLLDESCR.sizeof]
push ecx
call malloc
pop ecx
test eax, eax
jz .fail_and_free_coff
; save timestamp
lea edi, [eax+DLLDESCR.name]
rep movsb
mov esi, eax
mov eax, dword [fileinfo+24]
mov dword [esi+DLLDESCR.timestamp], eax
mov eax, dword [fileinfo+28]
mov dword [esi+DLLDESCR.timestamp+4], eax
; initialize DLLDESCR struct
and dword [esi+DLLDESCR.refcount], 0; no HDLLs yet; later it will be incremented
mov [esi+DLLDESCR.fd], dll_list
mov eax, [dll_list.bk]
mov [dll_list.bk], esi
mov [esi+DLLDESCR.bk], eax
mov [eax+DLLDESCR.fd], esi
; calculate size of loaded DLL
mov edx, [coff]
movzx ecx, [edx+CFH.nSections]
xor ebx, ebx
add edx, 20
@@:
call coff_get_align
add ebx, eax
not eax
and ebx, eax
add ebx, [edx+CFS.SizeOfRawData]
add edx, COFF_SECTION_SIZE
dec ecx
jnz @B
; it must be nonzero and not too big
mov [esi+DLLDESCR.size], ebx
test ebx, ebx
jz .fail_and_free_dll
cmp ebx, MAX_DEFAULT_DLL_ADDR-MIN_DEFAULT_DLL_ADDR
ja .fail_and_free_dll
; allocate memory for kernel-side image
stdcall kernel_alloc, ebx
test eax, eax
jz .fail_and_free_dll
mov [esi+DLLDESCR.data], eax
; calculate preferred base address
add ebx, 0x1FFF
and ebx, not 0xFFF
mov ecx, [dll_cur_addr]
lea edx, [ecx+ebx]
cmp edx, MAX_DEFAULT_DLL_ADDR
jb @f
mov ecx, MIN_DEFAULT_DLL_ADDR
lea edx, [ecx+ebx]
@@:
mov [esi+DLLDESCR.defaultbase], ecx
mov [dll_cur_addr], edx
; copy sections and set correct values for VirtualAddress'es in headers
push esi
mov edx, [coff]
movzx ebx, [edx+CFH.nSections]
mov edi, eax
add edx, 20
cld
@@:
call coff_get_align
add ecx, eax
add edi, eax
not eax
and ecx, eax
and edi, eax
mov [edx+CFS.VirtualAddress], ecx
add ecx, [edx+CFS.SizeOfRawData]
mov esi, [edx+CFS.PtrRawData]
push ecx
mov ecx, [edx+CFS.SizeOfRawData]
test esi, esi
jnz .copy
xor eax, eax
rep stosb
jmp .next
.copy:
add esi, [coff]
rep movsb
.next:
pop ecx
add edx, COFF_SECTION_SIZE
dec ebx
jnz @B
pop esi
; save some additional data from COFF file
; later we will use COFF header, headers for sections and symbol table
; and also relocations table for all sections
mov edx, [coff]
mov ebx, [edx+CFH.pSymTable]
mov edi, dword [fileinfo+32]
sub edi, ebx
jc .fail_and_free_data
mov [esi+DLLDESCR.symbols_lim], edi
add ebx, edx
movzx ecx, [edx+CFH.nSections]
lea ecx, [ecx*5]
lea edi, [edi+ecx*8+20]
add edx, 20
@@:
movzx eax, [edx+CFS.NumReloc]
lea eax, [eax*5]
lea edi, [edi+eax*2]
add edx, COFF_SECTION_SIZE
sub ecx, 5
jnz @b
stdcall kernel_alloc, edi
test eax, eax
jz .fail_and_free_data
mov edx, [coff]
movzx ecx, [edx+CFH.nSections]
lea ecx, [ecx*5]
lea ecx, [ecx*2+5]
mov [esi+DLLDESCR.coff_hdr], eax
push esi
mov esi, edx
mov edi, eax
rep movsd
pop esi
mov [esi+DLLDESCR.symbols_ptr], edi
push esi
mov ecx, [edx+CFH.nSymbols]
mov [esi+DLLDESCR.symbols_num], ecx
mov ecx, [esi+DLLDESCR.symbols_lim]
mov esi, ebx
rep movsb
pop esi
mov ebx, [esi+DLLDESCR.coff_hdr]
push esi
movzx eax, [edx+CFH.nSections]
lea edx, [ebx+20]
@@:
movzx ecx, [edx+CFS.NumReloc]
lea ecx, [ecx*5]
mov esi, [edx+CFS.PtrReloc]
mov [edx+CFS.PtrReloc], edi
sub [edx+CFS.PtrReloc], ebx
add esi, [coff]
shr ecx, 1
rep movsd
adc ecx, ecx
rep movsw
add edx, COFF_SECTION_SIZE
dec eax
jnz @b
pop esi
; fixup symbols
mov edx, ebx
mov eax, [ebx+CFH.nSymbols]
add edx, 20
mov ecx, [esi+DLLDESCR.symbols_num]
lea ecx, [ecx*9]
add ecx, ecx
add ecx, [esi+DLLDESCR.symbols_ptr]
stdcall fix_coff_symbols, edx, [esi+DLLDESCR.symbols_ptr], eax, \
ecx, 0
; test eax, eax
; jnz @F
;
;@@:
stdcall get_coff_sym, [esi+DLLDESCR.symbols_ptr], [ebx+CFH.nSymbols], szEXPORTS
test eax, eax
jnz @F
stdcall get_coff_sym, [esi+DLLDESCR.symbols_ptr], [ebx+CFH.nSymbols], sz_EXPORTS
@@:
mov [esi+DLLDESCR.exports], eax
; fix relocs in the hidden copy in kernel memory to default address
; it is first fix; usually this will be enough, but second fix
; can be necessary if real load address will not equal assumption
mov eax, [esi+DLLDESCR.data]
sub eax, [esi+DLLDESCR.defaultbase]
stdcall fix_coff_relocs, ebx, [esi+DLLDESCR.symbols_ptr], eax
stdcall kernel_free, [coff]
.dll_already_loaded:
inc [esi+DLLDESCR.refcount]
push esi
call init_heap
pop esi
mov edi, [esi+DLLDESCR.size]
stdcall user_alloc_at, [esi+DLLDESCR.defaultbase], edi
test eax, eax
jnz @f
stdcall user_alloc, edi
test eax, eax
jz .fail_and_dereference
@@:
mov [img_base], eax
mov eax, HDLL.sizeof
call malloc
test eax, eax
jz .fail_and_free_user
mov ebx, [CURRENT_TASK]
shl ebx, 5
mov edx, [CURRENT_TASK+ebx+TASKDATA.pid]
mov [eax+HDLL.pid], edx
push eax
call init_dlls_in_thread
pop ebx
test eax, eax
jz .fail_and_free_user
mov edx, [eax+HDLL.fd]
mov [ebx+HDLL.fd], edx
mov [ebx+HDLL.bk], eax
mov [eax+HDLL.fd], ebx
mov [edx+HDLL.bk], ebx
mov eax, ebx
mov ebx, [img_base]
mov [eax+HDLL.base], ebx
mov [eax+HDLL.size], edi
mov [eax+HDLL.refcount], 1
mov [eax+HDLL.parent], esi
mov edx, ebx
shr edx, 12
or dword [page_tabs+(edx-1)*4], DONT_FREE_BLOCK
; copy entries of page table from kernel-side image to usermode
; use copy-on-write for user-mode image, so map as readonly
xor edi, edi
mov ecx, [esi+DLLDESCR.data]
shr ecx, 12
.map_pages_loop:
mov eax, [page_tabs+ecx*4]
and eax, not 0xFFF
or al, PG_USER
xchg eax, [page_tabs+edx*4]
test al, 1
jz @f
call free_page
@@:
invlpg [ebx+edi]
inc ecx
inc edx
add edi, 0x1000
cmp edi, [esi+DLLDESCR.size]
jb .map_pages_loop
; if real user-mode base is not equal to preferred base, relocate image
sub ebx, [esi+DLLDESCR.defaultbase]
jz @f
stdcall rebase_coff, [esi+DLLDESCR.coff_hdr], [esi+DLLDESCR.symbols_ptr], ebx
@@:
mov eax, [esi+DLLDESCR.exports]
sub eax, [esi+DLLDESCR.defaultbase]
add eax, [img_base]
ret
.fail_and_free_data:
stdcall kernel_free, [esi+DLLDESCR.data]
.fail_and_free_dll:
mov eax, esi
call free
.fail_and_free_coff:
stdcall kernel_free, [coff]
.fail:
xor eax, eax
ret
.fail_and_free_user:
stdcall user_free, [img_base]
.fail_and_dereference:
mov eax, 1 ; delete 1 reference
call dereference_dll
xor eax, eax
ret
endp
; initialize [APPDATA.dlls_list_ptr] for given thread
; DLL is per-process object, so APPDATA.dlls_list_ptr must be
; kept in sync for all threads of one process.
; out: eax = APPDATA.dlls_list_ptr if all is OK,
; NULL if memory allocation failed
init_dlls_in_thread:
mov ebx, [current_slot]
mov eax, [ebx+APPDATA.dlls_list_ptr]
test eax, eax
jnz .ret
push [ebx+APPDATA.dir_table]
mov eax, 8
call malloc
pop edx
test eax, eax
jz .ret
mov [eax], eax
mov [eax+4], eax
mov ecx, [TASK_COUNT]
mov ebx, SLOT_BASE+256
.set:
cmp [ebx+APPDATA.dir_table], edx
jnz @f
mov [ebx+APPDATA.dlls_list_ptr], eax
@@:
add ebx, 256
dec ecx
jnz .set
.ret:
ret
; in: eax = number of references to delete, esi -> DLLDESCR struc
dereference_dll:
sub [esi+DLLDESCR.refcount], eax
jnz .ret
mov eax, [esi+DLLDESCR.fd]
mov edx, [esi+DLLDESCR.bk]
mov [eax+DLLDESCR.bk], edx
mov [edx+DLLDESCR.fd], eax
stdcall kernel_free, [esi+DLLDESCR.coff_hdr]
stdcall kernel_free, [esi+DLLDESCR.data]
mov eax, esi
call free
.ret:
ret
destroy_hdll:
push ebx ecx esi edi
push eax
mov ebx, [eax+HDLL.base]
mov esi, [eax+HDLL.parent]
mov edx, [esi+DLLDESCR.size]
; The following actions require the context of application where HDLL is mapped.
; However, destroy_hdll can be called in the context of OS thread when
; cleaning up objects created by the application which is destroyed.
; So remember current cr3 and set it to page table of target.
mov eax, [ecx+APPDATA.dir_table]
; Because we cheat with cr3, disable interrupts: task switch would restore
; page table from APPDATA of current thread.
; Also set [current_slot] because it is used by user_free.
pushf
cli
push [current_slot]
mov [current_slot], ecx
mov ecx, cr3
push ecx
mov cr3, eax
push ebx ; argument for user_free
mov eax, ebx
shr ebx, 12
push ebx
mov esi, [esi+DLLDESCR.data]
shr esi, 12
.unmap_loop:
push eax
mov eax, 2
xchg eax, [page_tabs+ebx*4]
mov ecx, [page_tabs+esi*4]
and eax, not 0xFFF
and ecx, not 0xFFF
cmp eax, ecx
jz @f
call free_page
@@:
pop eax
invlpg [eax]
add eax, 0x1000
inc ebx
inc esi
sub edx, 0x1000
ja .unmap_loop
pop ebx
and dword [page_tabs+(ebx-1)*4], not DONT_FREE_BLOCK
call user_free
; Restore context.
pop eax
mov cr3, eax
pop [current_slot]
popf
; Ok, cheating is done.
pop eax
push eax
mov esi, [eax+HDLL.parent]
mov eax, [eax+HDLL.refcount]
call dereference_dll
pop eax
mov edx, [eax+HDLL.bk]
mov ebx, [eax+HDLL.fd]
mov [ebx+HDLL.bk], edx
mov [edx+HDLL.fd], ebx
call free
pop edi esi ecx ebx
ret
; ecx -> APPDATA for slot, esi = dlls_list_ptr
destroy_all_hdlls:
test esi, esi
jz .ret
.loop:
mov eax, [esi+HDLL.fd]
cmp eax, esi
jz free
call destroy_hdll
jmp .loop
.ret:
ret
align 4
stop_all_services:
push ebp
mov edx, [srv.fd]
.next:
cmp edx, srv.fd-SRV_FD_OFFSET
je .done
cmp [edx+SRV.magic], ' SRV'
jne .next
cmp [edx+SRV.size], SRV.sizeof
jne .next
mov ebx, [edx+SRV.entry]
mov edx, [edx+SRV.fd]
test ebx, ebx
jz .next
push edx
mov ebp, esp
push 0
push -1
call ebx
mov esp, ebp
pop edx
jmp .next
.done:
pop ebp
ret
; param
; eax= size
; ebx= pid
align 4
create_kernel_object:
push ebx
call malloc
pop ebx
test eax, eax
jz .fail
mov ecx, [current_slot]
add ecx, APP_OBJ_OFFSET
pushfd
cli
mov edx, [ecx+APPOBJ.fd]
mov [eax+APPOBJ.fd], edx
mov [eax+APPOBJ.bk], ecx
mov [eax+APPOBJ.pid], ebx
mov [ecx+APPOBJ.fd], eax
mov [edx+APPOBJ.bk], eax
popfd
.fail:
ret
; param
; eax= object
align 4
destroy_kernel_object:
pushfd
cli
mov ebx, [eax+APPOBJ.fd]
mov ecx, [eax+APPOBJ.bk]
mov [ebx+APPOBJ.bk], ecx
mov [ecx+APPOBJ.fd], ebx
popfd
xor edx, edx ;clear common header
mov [eax], edx
mov [eax+4], edx
mov [eax+8], edx
mov [eax+12], edx
mov [eax+16], edx
call free ;release object memory
ret