badpork/kolibrios
1
0
Fork 0
forked from KolibriOS/kolibrios
Code Pull Requests Activity

kernel:f68.27 load_file_umode

Browse Source 
git-svn-id: svn://kolibrios.org@3786 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Sergey Semyonov (Serge) 2013-07-09 12:38:05 +00:00
parent bb7366e80a
commit faf0beb393
3 changed files with 143 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

132
kernel/trunk/core/dll.inc
View File

@ -408,7 +408,7 @@ endp
; allocate kernel memory and loads the specified file
;
; param
; file_name= full path to file
; file_name= path to file
;
; retval
; eax= file image in kernel memory
@ -509,6 +509,136 @@ proc load_file stdcall, file_name:dword
ret
endp
; description
; allocate user memory and loads the specified file
;
; param
; file_name= path to file
;
; retval
; eax= file image in user 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_umode 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 ?
km_file dd ?
um_file dd ?
endl
push esi
push edi
push ebx
lea eax, [attr]
stdcall get_fileinfo, [file_name], eax ;find file and get info
test eax, eax
jnz .err_1
mov eax, [file_size]
cmp eax, 1024*1024*16 ;to be enough for anybody (c)
ja .err_1
;it is very likely that the file is packed
stdcall kernel_alloc, [file_size] ;with kpack, so allocate memory from kernel heap
mov [km_file], eax
test eax, eax
jz .err_1
stdcall read_file, [file_name], eax, dword 0, [file_size]
cmp ebx, [file_size]
jne .err_2
mov eax, [km_file]
cmp dword [eax], 0x4B43504B ; check kpack signature
jne .raw_file
mov ebx, [eax+4] ;get real size of file
mov [file_size], ebx
stdcall user_alloc, ebx ;and allocate memory from user heap
mov [um_file], eax
test eax, eax
jz .err_2
pushad
mov ecx, unpack_mutex
call mutex_lock
stdcall unpack, [km_file], [um_file]
mov ecx, unpack_mutex
call mutex_unlock
popad
stdcall kernel_free, [km_file] ;we don't need packed file anymore
.exit:
mov eax, [um_file]
mov edx, [file_size]
pop ebx
pop edi
pop esi
ret
.raw_file: ; sometimes we load unpacked file
stdcall user_alloc, ebx ; allocate space from user heap
mov [um_file], eax
test eax, eax
jz .err_2
shr eax, 10 ; and remap pages.
mov ecx, [file_size]
add ecx, 4095
shr ecx, 12
mov esi, [km_file]
shr esi, 10
add esi, page_tabs
lea edi, [page_tabs+eax]
cld
@@:
lodsd
and eax, 0xFFFFF000
or eax, PG_USER
stosd
loop @B
stdcall free_kernel_space, [km_file] ; release allocated kernel space
jmp .exit ; physical pages still in use
.err_2:
stdcall kernel_free, [km_file]
.err_1:
xor eax, eax
xor edx, edx
pop ebx
pop edi
pop esi
ret
endp
uglobal
align 4
unpack_mutex MUTEX

12
kernel/trunk/core/memory.inc
View File

@ -1199,7 +1199,7 @@ f68:
cmp ebx, 11
jb .fail
cmp ebx, 25
cmp ebx, 27
ja .fail
jmp dword [f68call+ebx*4-11*4]
@ -1310,6 +1310,15 @@ f68:
mov [esp+32], eax
ret
.27:
cmp ecx, OS_BASE
jae .fail
stdcall load_file_umode, ecx
mov [esp+24], edx
mov [esp+32], eax
ret
.fail:
xor eax, eax
mov [esp+32], eax
@ -1335,6 +1344,7 @@ f68call: ; keep this table closer to main code
dd f68.24 ; set exception handler
dd f68.25 ; unmask exception
dd f68.26 ; user_unmap
dd f68.27 ; load_file_umode
align 4