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*Fixed bug in procedure starting applications

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from /rd and /fd when some memory after end of 
 image hasn't been initialized by zero.
*Kernel now takes into account size of image
 when starting from /rd and /fd. (previously it
 assumes that size of file is equal to size of
 image)

git-svn-id: svn://kolibrios.org@130 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Andrey Halyavin (halyavin) 2006-08-15 16:59:11 +00:00
parent e3172037f7
commit b573c43d09
1 changed files with 40 additions and 6 deletions
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46
kernel/trunk/core/newproce.inc
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@ -177,6 +177,7 @@ new_start_application_floppy:
mov edx,eax ;read file block to current page mov edx,eax ;read file block to current page
mov eax,[esp+4] ;restore pointer to file name mov eax,[esp+4] ;restore pointer to file name
mov ecx,8 ;number of blocks read mov ecx,8 ;number of blocks read
mov ebp,edx ;save buffer address for .endofimage
push ebx push ebx
mov edi,[esp+16] mov edi,[esp+16]
; cli ; cli
@ -184,17 +185,33 @@ new_start_application_floppy:
;ebx=file size ;ebx=file size
; sti ; sti
pop ecx pop ecx
add ecx,8
test eax,eax
jnz .endloop1 ;check io errors
mov eax,[app_i_end]
add eax,511
shr eax,9
cmp ecx,eax
jg .endofimage ;we have loaded whole program
add ebx,511
shr ebx,9 shr ebx,9
cmp ecx,ebx cmp ecx,ebx
jg .endloop1 ;if end of file? jg .endloop1 ;if end of file?
mov ebx,ecx mov ebx,ecx
test eax,eax
jnz .endloop1 ;check io errors
pop edx pop edx
add ebx,8 ;go to next page
add edx,4 add edx,4
jmp .loop1 jmp .loop1
.endofimage: ;set to zero memory at end of page
mov ecx,[app_i_end]
and ecx,4096-1
jz .endloop1
lea edi,[ebp+ecx]
neg ecx
add ecx,4096
xor eax,eax
cld
rep stosb
.endloop1: .endloop1:
add esp,8+4 ;pop linear address of page table entry and pointer to file name add esp,8+4 ;pop linear address of page table entry and pointer to file name
call new_start_application_fl.add_app_parameters call new_start_application_fl.add_app_parameters
@ -342,23 +359,40 @@ new_start_application_fl:
mov edx,eax ;read file block to current page mov edx,eax ;read file block to current page
mov eax,[esp+4] ;restore pointer to file name mov eax,[esp+4] ;restore pointer to file name
mov ecx,8 ;number of blocks read mov ecx,8 ;number of blocks read
mov ebp,edx ;save buffer address for .endofimage
push ebx push ebx
cli cli
call fileread call fileread
;ebx=file size ;ebx=file size
call safe_sti call safe_sti
pop ecx pop ecx
add ecx,8
test eax,eax
jnz .endloop1 ;check io errors
mov eax,[app_i_end]
add eax,511
shr eax,9
cmp ecx,eax
jg .endofimage ;we have loaded whole program
add ebx,511
shr ebx,9 shr ebx,9
cmp ecx,ebx cmp ecx,ebx
jg .endloop1 ;if end of file? jg .endloop1 ;if end of file?
mov ebx,ecx mov ebx,ecx
test eax,eax
jnz .endloop1 ;check io errors
pop edx pop edx
add ebx,8 ;go to next page
add edx,4 add edx,4
jmp .loop1 jmp .loop1
.endofimage: ;set to zero memory at end of page
mov ecx,[app_i_end]
and ecx,4096-1
jz .endloop1
lea edi,[ebp+ecx]
neg ecx
add ecx,4096
xor eax,eax
cld
rep stosb
.endloop1: .endloop1:
add esp,8 ;pop linear address of page table entry and pointer to file name add esp,8 ;pop linear address of page table entry and pointer to file name
call .add_app_parameters call .add_app_parameters