perso
/
cos2000v1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

feat: ajout des fonctions de debug par GDB

This commit is contained in:
Nicolas Hordé 2019-07-13 13:33:26 +02:00
parent 53b445a652
commit 2a7798dfd3
5 changed files with 220 additions and 188 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

234
boot/boot12.asm
View File

@ -7,138 +7,144 @@ include "..\include\divers.h"
org 7C00h org 7C00h
jmp boot jmp Boot
bootsec bootinfo "COS2000A","COS2000 ","FAT12 " bootsec bootinfo "COS2000A","COS2000 ","FAT12 "
errorloading db " [Erreur]",0dh,0ah,0 Boot_Message db "Cos2000",0
okloading db "Recherche noyau ",0Dh,0ah," -" Entre_Message db "Search",0
sys db "SYSTEME SYS",0 Loading_Message db "Load",0
syst db " [ Ok ]",0dh,0ah,"Chargement ",0 System_File db "As",0,"y",0,"s",0,"t",0,"e",0,0x0F,0,0x38,"m",0,"e",0,".",0,"s",0,"y",0,"s",0,0,0,0,0,0xFF,0xFF
dot db ".",0 Is_Ok db " [ OK ]",0x0A,0x0D,0
Is_Failed db " [ERROR]",0x0A,0x0D,0
The_Dot db '.',0
errorboot: Boot_Error:
mov si,errorloading mov si,Is_Failed
call showstr call ShowString
mov ah,0 xor ax,ax
int 16h int 0x16
int 19h int 0x19
boot: Boot_Ok:
mov [bootsec.bootdrive],dl mov si,Is_Ok
cli call ShowString
mov ax,09000h ret
mov ss,ax
mov sp,0FFFFh Boot:
sti
boot2:
push cs push cs
push cs push cs
pop es pop es
pop ds pop ds
mov [bootsec.bootdrive],dl
cli
mov ax,0x9000
mov ss,ax
mov sp,0xFFFF
sti
mov si,Boot_Message
call ShowString
xor ax,ax xor ax,ax
mov dl,[bootsec.bootdrive] int 0x13
int 13h jc Boot_Error
jc errorboot
mov si,okloading
call showstr
mov cx,[bootsec.reservedsectors] mov cx,[bootsec.reservedsectors]
add cx,[bootsec.hiddensectorsh] add cx,[bootsec.hiddensectorsh]
adc cx,[bootsec.hiddensectorsl] adc cx,[bootsec.hiddensectorsl]
push cx
mov bx,[bootsec.sectorsperfat] mov bx,[bootsec.sectorsperfat]
mov di,bufferfat mov di,bufferfat
push bx
push cx
readfat: readfat:
call readsector call ReadSector
jc errorboot jc Boot_Error
inc cx inc cx
add di,[bootsec.sectorsize] add di,[bootsec.sectorsize]
dec bx dec bx
jnz readfat jnz readfat
pop cx pop cx
pop bx
xor ax,ax xor ax,ax
mov al,[bootsec.fatsperdrive] mov al,[bootsec.fatsperdrive]
mov bx,[bootsec.sectorsperfat]
mul bx mul bx
add cx,ax add cx,ax
mov ax,32 mov ax,32
mul [bootsec.directorysize] mul word [bootsec.directorysize]
div [bootsec.sectorsize] div word [bootsec.sectorsize]
add ax,cx add ax,cx
sub ax,2 sub ax,2
mov word [bootsec.reservedfornt],ax mov word [bootsec.reservedfornt],ax
xor dx,dx xor dx,dx
checkroot: call Boot_Ok
mov si,Loading_Message
call ShowString
Find_System:
mov di,buffer mov di,buffer
call readsector call ReadSector
jc errorboot jc Near Boot_Error
xor bx,bx xor bx,bx
findnext: Next_Root_Entrie:
cmp byte [di],0 cmp byte [di],0
je errorboot je near Boot_Error
cmp byte [di],0E5h push di
je no push cx
cmp byte [di],041h mov si,System_File
je no mov cx,32
mov si,dot
call showstr
push di cx
mov si,sys
mov cx,11
rep cmpsb rep cmpsb
pop cx di pop cx
je oksystem pop di
no: je System_Found
add di,32 add di,32
add bx,32 add bx,32
inc dx inc dx
cmp dx,[bootsec.directorysize] cmp dx,[bootsec.directorysize]
ja errorboot ja near Boot_Error
cmp bx,[bootsec.sectorsize] cmp bx,[bootsec.sectorsize]
jb findnext jb Next_Root_Entrie
inc cx inc cx
jmp checkroot jmp Find_System
oksystem: System_Found:
mov si,syst call Boot_Ok
call showstr mov si,Entre_Message
mov cx,[di+26] call ShowString
mov ax,8000h mov cx,[di+26+32]
mov ax,0x8000
mov es,ax mov es,ax
push es push es
mov di,0000h mov di,0x0
push 0010h push 0x10
mov si,dot mov si,The_Dot
xor ax,ax Resume_Loading:
fatagain: cmp cx,0x0FF0
cmp cx,0FF0h jae Finish_Loading
jae finishload
push cx push cx
add cx,word [bootsec.reservedfornt] add cx,word [bootsec.reservedfornt]
call readsector call ReadSector
pop cx pop cx
jc errorboot jc near Boot_Error
inc ax call ShowString
call showstr
add di,[bootsec.sectorsize] add di,[bootsec.sectorsize]
call getfat call NextFatGroup
jnc fatagain jc near Boot_Error
finishload: jmp Resume_Loading
Finish_Loading:
call Boot_Ok
retf retf
;=============READSECTOR (Fonction 01H)=============== ;====================READSECTOR=======================
;Lit le secteur CX et le met en es:di ;Lit le secteur logique LBA CX et le met en es:di
;-> AH=1 ;-> CX (limité à 65536 secteurs, soit 32 Mo avec secteur 512 octets)
;<- Flag Carry si erreur ;<- Flag Carry si erreur
;===================================================== ;=====================================================
readsector: ReadSector:
push ax bx cx dx si pusha
mov ax,cx mov ax,cx
xor dx,dx xor dx,dx
div [bootsec.sectorspertrack] div word [bootsec.sectorspertrack]
inc dl inc dl
mov bl,dl mov bl,dl
xor dx,dx xor dx,dx
div [bootsec.headsperdrive] div word [bootsec.headsperdrive]
mov dh, [bootsec.bootdrive]
xchg dl,dh xchg dl,dh
mov cx,ax mov cx,ax
xchg cl,ch xchg cl,ch
@ -147,57 +153,68 @@ readsector:
mov bx,di mov bx,di
mov si, 4 mov si, 4
mov al, 1 mov al, 1
tryagain: Read_Again:
mov ah, 2 mov ah, 2
mov dl,[bootsec.bootdrive] int 0x13
int 13h jnc Read_Done
jnc done
dec si dec si
jnz tryagain jnz Read_Again
done: Read_Done:
pop si dx cx bx ax popa
ret ret
;===================NEXTFATGROUP======================
getfat: ;Renvoie en CX le groupe qui succède dans la FAT le groupe CX
push ax bx dx di ;-> CX
mov di,bufferfat ;<-
;=====================================================
NextFatGroup:
push bx
push dx
push di
mov ax,cx mov ax,cx
mov bx,ax mov bx,ax
and bx,0000000000000001b and bx,0000000000000001b
shr ax,1 shr ax,1
mov cx,3 mov cx,3
mul cx mul cx
mov di,bufferfat
add di,ax add di,ax
cmp bx,0h cmp bx,0
jnz evenfat jnz Even_Group
oddfat: Odd_Group:
mov dx,[di] mov dx,[di]
and dx,0FFFh and dx,0x0FFF
mov cx,dx mov cx,dx
jmp endfat jmp Next_Group_Found
evenfat: Even_Group:
mov dx,[di+1] mov dx,[di+1]
and dx,0FFF0h and dx,0xFFF0
shr dx,4 shr dx,4
mov cx,dx mov cx,dx
endfat: Next_Group_Found:
pop di dx bx ax pop di
pop dx
pop bx
ret ret
;======================SHOWSTR========================
showstr: ;Affiche la chaine de caractère pointé par ds:si à l'écran
push ax bx si ;-> DS, SI
again: ;<- Flag Carry si erreur
;=====================================================
ShowString:
pusha
Next_Char:
lodsb lodsb
or al,al or al,al
jz fin jz End_Show
mov ah,0Eh mov ah,0x0E
mov bx,07h mov bx,0x07
int 10h int 0x10
jmp again jmp Next_Char
fin: End_Show:
pop si bx ax popa
ret ret
rb 7C00h+512-2-$ rb 7C00h+512-2-$
@ -209,4 +226,3 @@ buffer:
rb 7C00h+512+2048-$ rb 7C00h+512+2048-$
bufferfat: bufferfat:
rb 7C00h+512+4096-$ rb 7C00h+512+4096-$

8
debug/boot.txt Normal file
View File

@ -0,0 +1,8 @@
target remote localhost:1234
set disassembly-flavor intel
set architecture i8086
display/20i $pc+$cs*16
break *0x7c00
cont
clear *0x7c00

9
debug/system.txt Normal file
View File

@ -0,0 +1,9 @@
target remote localhost:1234
set disassembly-flavor intel
set architecture i386
display/20i $pc+$cs*16
break *0x80010
cont
clear *0x80010

5
final/makefile
View File

@ -3,14 +3,13 @@ all: cos2000.img
cos2000.img: cos2000.img:
(dd if=/dev/zero of=cos2000.img count=2880 bs=512) (dd if=/dev/zero of=cos2000.img count=2880 bs=512)
(mkfs.msdos -F 12 -n "COS2000" cos2000.img) (mkfs.msdos -F 12 -n "COS2000" cos2000.img)
(fusefat cos2000.img ./mnt -o rw+) (fusermount ./mnt -u;mkdir -p ./mnt;rm -rf ./mnt/*;fusefat cos2000.img ./mnt -o rw+)
(cp ../noyau/systeme.sys ./mnt/) (cp ../noyau/systeme.sys ./mnt/)
(cp ../noyau/systeme.ini ./mnt/) (cp ../noyau/systeme.ini ./mnt/)
(cp ../programs/*.ce ./mnt/) (cp ../programs/*.ce ./mnt/)
(cp ../programs/*.lib ./mnt/)
(cp ../programs/*.rip ./mnt/) (cp ../programs/*.rip ./mnt/)
(cp ../lib/*.lib ./mnt/) (cp ../lib/*.lib ./mnt/)
(cp ../system/system.sys ./mnt/;sync) (sync)
(fusermount ./mnt -u) (fusermount ./mnt -u)
(dd if=../boot/boot12.bin of=cos2000.img seek=0 count=1 conv=notrunc;sync) (dd if=../boot/boot12.bin of=cos2000.img seek=0 count=1 conv=notrunc;sync)

8
makefile
View File

@ -20,15 +20,15 @@ copy:
test: all copy qemu test: all copy qemu
view: view: final/cos2000.img
(hexdump -C ./final/cos2000.img|head -c10000) (hexdump -C ./final/cos2000.img|head -c10000)
view2: boot/boot12.bin
(objdump -D -b binary -mi386 -Maddr16,data16 ./boot/boot12.bin)
debug-boot: all copy qemu-debug debug-boot: all copy qemu-debug
(sleep 2;cgdb -x ./debug/boot.txt) (sleep 2;cgdb -x ./debug/boot.txt)
debug-loader: all copy qemu-debug
(sleep 2;cgdb -x ./debug/loader.txt)
debug-system: all copy qemu-debug debug-system: all copy qemu-debug
(sleep 2;cgdb -x ./debug/system.txt) (sleep 2;cgdb -x ./debug/system.txt)