feat: ajout des fonctions de debug par GDB
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parent
53b445a652
commit
2a7798dfd3
378
boot/boot12.asm
378
boot/boot12.asm
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@ -7,199 +7,216 @@ include "..\include\divers.h"
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org 7C00h
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jmp boot
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jmp Boot
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bootsec bootinfo "COS2000A","COS2000 ","FAT12 "
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errorloading db " [Erreur]",0dh,0ah,0
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okloading db "Recherche noyau ",0Dh,0ah," -"
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sys db "SYSTEME SYS",0
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syst db " [ Ok ]",0dh,0ah,"Chargement ",0
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dot db ".",0
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Boot_Message db "Cos2000",0
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Entre_Message db "Search",0
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Loading_Message db "Load",0
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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
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Is_Ok db " [ OK ]",0x0A,0x0D,0
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Is_Failed db " [ERROR]",0x0A,0x0D,0
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The_Dot db '.',0
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errorboot:
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mov si,errorloading
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call showstr
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mov ah,0
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int 16h
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int 19h
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Boot_Error:
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mov si,Is_Failed
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call ShowString
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xor ax,ax
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int 0x16
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int 0x19
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boot:
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mov [bootsec.bootdrive],dl
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cli
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mov ax,09000h
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mov ss,ax
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mov sp,0FFFFh
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sti
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boot2:
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push cs
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push cs
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pop es
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pop ds
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xor ax,ax
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mov dl,[bootsec.bootdrive]
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int 13h
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jc errorboot
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mov si,okloading
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call showstr
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mov cx,[bootsec.reservedsectors]
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add cx,[bootsec.hiddensectorsh]
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adc cx,[bootsec.hiddensectorsl]
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push cx
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mov bx,[bootsec.sectorsperfat]
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mov di,bufferfat
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Boot_Ok:
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mov si,Is_Ok
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call ShowString
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ret
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Boot:
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push cs
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push cs
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pop es
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pop ds
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mov [bootsec.bootdrive],dl
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cli
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mov ax,0x9000
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mov ss,ax
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mov sp,0xFFFF
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sti
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mov si,Boot_Message
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call ShowString
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xor ax,ax
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int 0x13
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jc Boot_Error
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mov cx,[bootsec.reservedsectors]
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add cx,[bootsec.hiddensectorsh]
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adc cx,[bootsec.hiddensectorsl]
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mov bx,[bootsec.sectorsperfat]
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mov di,bufferfat
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push bx
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push cx
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readfat:
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call readsector
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jc errorboot
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inc cx
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add di,[bootsec.sectorsize]
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dec bx
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jnz readfat
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pop cx
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xor ax,ax
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mov al,[bootsec.fatsperdrive]
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mov bx,[bootsec.sectorsperfat]
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mul bx
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add cx,ax
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mov ax,32
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mul [bootsec.directorysize]
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div [bootsec.sectorsize]
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add ax,cx
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sub ax,2
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mov word [bootsec.reservedfornt],ax
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xor dx,dx
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checkroot:
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mov di,buffer
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call readsector
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jc errorboot
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xor bx,bx
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findnext:
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cmp byte [di],0
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je errorboot
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cmp byte [di],0E5h
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je no
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cmp byte [di],041h
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je no
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mov si,dot
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call showstr
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push di cx
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mov si,sys
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mov cx,11
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rep cmpsb
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pop cx di
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je oksystem
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no:
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add di,32
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add bx,32
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inc dx
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cmp dx,[bootsec.directorysize]
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ja errorboot
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cmp bx,[bootsec.sectorsize]
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jb findnext
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inc cx
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jmp checkroot
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oksystem:
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mov si,syst
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call showstr
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mov cx,[di+26]
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mov ax,8000h
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mov es,ax
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push es
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mov di,0000h
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push 0010h
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mov si,dot
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xor ax,ax
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fatagain:
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cmp cx,0FF0h
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jae finishload
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push cx
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add cx,word [bootsec.reservedfornt]
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call readsector
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pop cx
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jc errorboot
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inc ax
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call showstr
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add di,[bootsec.sectorsize]
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call getfat
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jnc fatagain
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finishload:
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retf
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call ReadSector
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jc Boot_Error
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inc cx
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add di,[bootsec.sectorsize]
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dec bx
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jnz readfat
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pop cx
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pop bx
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xor ax,ax
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mov al,[bootsec.fatsperdrive]
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mul bx
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add cx,ax
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mov ax,32
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mul word [bootsec.directorysize]
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div word [bootsec.sectorsize]
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add ax,cx
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sub ax,2
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mov word [bootsec.reservedfornt],ax
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xor dx,dx
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call Boot_Ok
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mov si,Loading_Message
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call ShowString
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Find_System:
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mov di,buffer
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call ReadSector
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jc Near Boot_Error
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xor bx,bx
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Next_Root_Entrie:
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cmp byte [di],0
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je near Boot_Error
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push di
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push cx
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mov si,System_File
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mov cx,32
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rep cmpsb
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pop cx
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pop di
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je System_Found
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add di,32
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add bx,32
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inc dx
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cmp dx,[bootsec.directorysize]
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ja near Boot_Error
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cmp bx,[bootsec.sectorsize]
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jb Next_Root_Entrie
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inc cx
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jmp Find_System
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System_Found:
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call Boot_Ok
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mov si,Entre_Message
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call ShowString
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mov cx,[di+26+32]
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mov ax,0x8000
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mov es,ax
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push es
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mov di,0x0
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push 0x10
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mov si,The_Dot
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Resume_Loading:
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cmp cx,0x0FF0
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jae Finish_Loading
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push cx
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add cx,word [bootsec.reservedfornt]
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call ReadSector
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pop cx
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jc near Boot_Error
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call ShowString
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add di,[bootsec.sectorsize]
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call NextFatGroup
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jc near Boot_Error
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jmp Resume_Loading
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Finish_Loading:
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call Boot_Ok
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retf
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;=============READSECTOR (Fonction 01H)===============
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;Lit le secteur CX et le met en es:di
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;-> AH=1
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;====================READSECTOR=======================
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;Lit le secteur logique LBA CX et le met en es:di
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;-> CX (limité à 65536 secteurs, soit 32 Mo avec secteur 512 octets)
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;<- Flag Carry si erreur
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;=====================================================
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readsector:
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push ax bx cx dx si
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mov ax,cx
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xor dx,dx
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div [bootsec.sectorspertrack]
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inc dl
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mov bl,dl
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xor dx,dx
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div [bootsec.headsperdrive]
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xchg dl,dh
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mov cx,ax
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xchg cl,ch
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shl cl,6
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or cl, bl
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mov bx,di
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mov si, 4
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mov al, 1
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tryagain:
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mov ah, 2
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mov dl,[bootsec.bootdrive]
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int 13h
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jnc done
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dec si
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jnz tryagain
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done:
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pop si dx cx bx ax
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ret
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getfat:
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push ax bx dx di
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mov di,bufferfat
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mov ax,cx
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mov bx,ax
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and bx,0000000000000001b
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shr ax,1
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mov cx,3
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mul cx
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add di,ax
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cmp bx,0h
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jnz evenfat
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oddfat:
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mov dx,[di]
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and dx,0FFFh
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mov cx,dx
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jmp endfat
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evenfat:
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mov dx,[di+1]
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and dx,0FFF0h
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shr dx,4
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mov cx,dx
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endfat:
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pop di dx bx ax
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ReadSector:
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pusha
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mov ax,cx
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xor dx,dx
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div word [bootsec.sectorspertrack]
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inc dl
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mov bl,dl
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xor dx,dx
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div word [bootsec.headsperdrive]
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mov dh, [bootsec.bootdrive]
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xchg dl,dh
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mov cx,ax
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xchg cl,ch
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shl cl,6
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or cl, bl
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mov bx,di
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mov si, 4
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mov al, 1
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Read_Again:
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mov ah, 2
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int 0x13
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jnc Read_Done
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dec si
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jnz Read_Again
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Read_Done:
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popa
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ret
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showstr:
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push ax bx si
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again:
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;===================NEXTFATGROUP======================
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;Renvoie en CX le groupe qui succède dans la FAT le groupe CX
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;-> CX
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;<-
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;=====================================================
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NextFatGroup:
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push bx
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push dx
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push di
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mov ax,cx
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mov bx,ax
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and bx,0000000000000001b
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shr ax,1
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mov cx,3
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mul cx
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mov di,bufferfat
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add di,ax
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cmp bx,0
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jnz Even_Group
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Odd_Group:
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mov dx,[di]
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and dx,0x0FFF
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mov cx,dx
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jmp Next_Group_Found
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Even_Group:
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mov dx,[di+1]
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and dx,0xFFF0
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shr dx,4
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mov cx,dx
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Next_Group_Found:
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pop di
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pop dx
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pop bx
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ret
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;======================SHOWSTR========================
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;Affiche la chaine de caractère pointé par ds:si à l'écran
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;-> DS, SI
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;<- Flag Carry si erreur
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;=====================================================
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ShowString:
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pusha
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Next_Char:
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lodsb
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or al,al
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jz fin
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mov ah,0Eh
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mov bx,07h
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int 10h
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jmp again
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fin:
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pop si bx ax
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or al,al
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jz End_Show
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mov ah,0x0E
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mov bx,0x07
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int 0x10
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jmp Next_Char
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End_Show:
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popa
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ret
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rb 7C00h+512-2-$
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db 055h,0AAh
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@ -209,4 +226,3 @@ buffer:
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rb 7C00h+512+2048-$
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bufferfat:
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rb 7C00h+512+4096-$
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@ -0,0 +1,8 @@
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target remote localhost:1234
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set disassembly-flavor intel
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set architecture i8086
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display/20i $pc+$cs*16
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break *0x7c00
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cont
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clear *0x7c00
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@ -0,0 +1,9 @@
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target remote localhost:1234
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set disassembly-flavor intel
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set architecture i386
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display/20i $pc+$cs*16
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break *0x80010
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cont
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clear *0x80010
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@ -3,14 +3,13 @@ all: cos2000.img
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cos2000.img:
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(dd if=/dev/zero of=cos2000.img count=2880 bs=512)
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(mkfs.msdos -F 12 -n "COS2000" cos2000.img)
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(fusefat cos2000.img ./mnt -o rw+)
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(fusermount ./mnt -u;mkdir -p ./mnt;rm -rf ./mnt/*;fusefat cos2000.img ./mnt -o rw+)
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(cp ../noyau/systeme.sys ./mnt/)
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(cp ../noyau/systeme.ini ./mnt/)
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(cp ../programs/*.ce ./mnt/)
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(cp ../programs/*.lib ./mnt/)
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(cp ../programs/*.rip ./mnt/)
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(cp ../lib/*.lib ./mnt/)
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(cp ../system/system.sys ./mnt/;sync)
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(sync)
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(fusermount ./mnt -u)
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(dd if=../boot/boot12.bin of=cos2000.img seek=0 count=1 conv=notrunc;sync)
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8
makefile
8
makefile
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@ -20,15 +20,15 @@ copy:
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test: all copy qemu
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view:
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view: final/cos2000.img
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(hexdump -C ./final/cos2000.img|head -c10000)
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view2: boot/boot12.bin
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(objdump -D -b binary -mi386 -Maddr16,data16 ./boot/boot12.bin)
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debug-boot: all copy qemu-debug
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(sleep 2;cgdb -x ./debug/boot.txt)
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debug-loader: all copy qemu-debug
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(sleep 2;cgdb -x ./debug/loader.txt)
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debug-system: all copy qemu-debug
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(sleep 2;cgdb -x ./debug/system.txt)
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