Drop debug.drv, rework debug rom instead
This commit is contained in:
parent
2569dde385
commit
c8adeb35d2
4
Makefile
4
Makefile
@ -73,10 +73,6 @@ fate.bs: boot/fat.asm
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%.rom: rom/%.asm utils/fix-rom
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$(NASM) $(NASM_ARGS) -o $@ $< && utils/fix-rom $@
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# rdos drivers
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%.drv: driver/%.asm
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$(NASM) $(NASM_ARGS) -o $@ $<
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fdimage.img: fat1.bs $(DISTFILES)
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mformat -C -i $@ -f $(FLOPPY) -B fat1.bs ::
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mmd -i $@ ::rdos
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@ -1,76 +0,0 @@
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jmp init
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align 4
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db "rDos"
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align 8
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; hook interrupt 3
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db 3
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db 0
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dw int3entry
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dd 0
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; end of header
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db 0
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stacksize: equ 0x20
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init:
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mov ax, 0x0e33
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xor bx, bx
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int 0x10
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retf
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int3entry:
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; save DS and AX
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mov [cs:reg_ds], ds
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mov [cs:reg_ax], ax
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; use AX to load DS=CS
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mov ax, cs
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mov ds, ax
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; pop IP, CS and flags from stack
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pop ax
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mov [reg_ip], ax
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pop ax
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mov [reg_cs], ax
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pop ax
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mov [reg_fl], ax
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; save the other registers
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mov [reg_cx], cx
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mov [reg_dx], dx
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mov [reg_bx], bx
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mov [reg_sp], sp
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mov [reg_bp], bp
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mov [reg_si], si
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mov [reg_di], di
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; save other segment registers we can access
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mov [reg_ss], ss
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mov [reg_es], es
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; initialize other segments and setup stack
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mov es, ax
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mov ss, ax
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mov sp, (stack+stacksize)
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hlt: hlt
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jmp hlt
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reg_ax: dw 0
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reg_cx: dw 0
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reg_dx: dw 0
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reg_bx: dw 0
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reg_sp: dw 0
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reg_bp: dw 0
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reg_si: dw 0
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reg_di: dw 0
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reg_es: dw 0
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reg_cs: dw 0
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reg_ss: dw 0
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reg_ds: dw 0
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reg_ip: dw 0
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reg_fl: dw 0
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names: db "AXCXDXBXSPBPSIDI"
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db "DSESSSCSIPFL"
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stack: times stacksize dw 0
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align 16
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374
rom/debug.asm
374
rom/debug.asm
@ -1,71 +1,26 @@
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cpu 8086
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org 0x0000
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cpu 8086
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org 0x0000
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%macro push8086 0
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push ss
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push es
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push ds
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push di
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push si
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push bp
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push sp
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push bx
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push dx
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push cx
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push ax
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stacksize: equ 0x20
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; adjust stored SP to be value before interrupt
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mov bp, sp
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mov [bp+08], bp
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add WORD [bp+08], 28
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%endmacro
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%macro pop8086 0
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pop ax
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pop cx
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pop dx
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pop bx
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add sp, 2 ; skip SP
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pop bp
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pop si
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pop di
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pop ds
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pop es
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add sp, 2 ; skip SS
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%endmacro
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rom:
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db 0x55, 0xAA
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.sectors:
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db 0x00
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.init:
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jmp init
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nop
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.name:
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db "RDOS DEBUG", 0
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times (0x18 - ($-$$)) db 0
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.pcir_ptr:
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dw 0
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times (0x1A - ($-$$)) db 0
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.pnp_ptr:
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dw pnp
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pnp:
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db "$PnP"
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.version:
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pnp: db "$PnP"
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db 1 ; version 1
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.length:
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db 2 ; 2 * 16 length
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dw 0 ; offset of next header
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db 0
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.checksum:
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db 0 ; checksum (filled by fix-rom)
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dd 0 ; device identifier
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dw 0 ; manufacturer string
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dw rom.name ; product name string
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dw name ; product name string
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db 0,0,0 ; device type string
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db 0x20 ; device indicator, bit for "read cacheable" set
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dw 0 ; boot connection vector
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@ -74,221 +29,152 @@ pnp:
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dw 0 ; reserved
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dw 0
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init:
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mov bx, 0
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mov dx, isr_divide_error
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call hook_int
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name: db "rdos debug"
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mov bx, 1
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mov dx, isr_singlestep
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call hook_int
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mov bx, 2
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mov dx, isr_nmi
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call hook_int
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mov bx, 3
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mov dx, isr_breakpoint
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call hook_int
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mov bx, 4
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mov dx, isr_overflow
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call hook_int
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; 5 left out
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mov bx, 6
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mov dx, isr_invalid_opcode
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call hook_int
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init: push ds
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push es
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push si
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push di
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push ax
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push cx
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xor ax, ax
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mov si, ax
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mov di, ax
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; load DS for
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mov ds, ax
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mov al, [cs:2]
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inc ax
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shr ax, 1
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; move down int 0x12 ptr to make space for us
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sub [0x413], ax
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; calculate segment from kilobytes
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mov ax, [0x413]
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mov cl, 6
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shl ax, cl
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; load ES for relocate
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mov es, ax
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; store interrupt vector
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mov word [3*4], int3entry
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mov word [3*4+2], es
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; load DS for relocate
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push cs
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pop ds
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mov si, rom.name
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push cs
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push si
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call printf
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db "%S %X", 0x0A, 0x0D, 0
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add sp, 4
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; calculate our length
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mov cx, codeend
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rep movsb
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pop cx
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pop ax
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pop di
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pop si
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pop es
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pop ds
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retf
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; Hook interrupt
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hook_int:
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; bx times 4
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add bx, bx
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add bx, bx
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; store offset
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mov [bx], dx
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; store segment
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push ax
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mov ax, cs
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mov [bx+2], ax
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pop ax
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print16:
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; setup bx and ah for int 10h call
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xor bx, bx
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mov ah, 0x0e
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mov cl, 4
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; this double-call is essentially a 4 times repeating loop
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call .c1
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.c1: call .c2
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.c2: ; grab highest nibble from dx
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mov al, dh
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; remove highest nibble from dx
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shl dx, cl
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; shift away second-highest nibble that we accidentally copied
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shr al, cl
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; map 0-9 to ascii codes for '0' to '9'
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add al, 0x30
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; if result is larger than '9', ...
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cmp al, 0x3a
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jl .noadj
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; ... add 7 so we continue at 'A'
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add al, 7
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.noadj: int 0x10
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ret
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putc:
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push bx
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push cx
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printregs:
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mov cx, 14
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xor bx, bx
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mov ah, 0x0e
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mov bx, 0x0000
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mov si, reg_ax
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.loop: push cx
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mov dx, [si+(names-reg_ax)]
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mov al, dl
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int 0x10
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mov al, dh
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int 0x10
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mov al, '='
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int 0x10
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lodsw
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mov dx, ax
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call print16
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mov al, ' '
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int 0x10
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pop cx
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pop bx
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loop .loop
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ret
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; Names for words in debug frame
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; Two characters per word, 14 words total
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debug_frame_names:
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; general-purpose registers
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db "AXCXDXBXSPBPSIDI"
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; extra registers
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db "DSESSSIPCSFL"
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int3entry:
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; save DS and AX
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mov [cs:reg_ds], ds
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mov [cs:reg_ax], ax
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; use AX to load DS=CS
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mov ax, cs
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mov ds, ax
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; pop IP, CS and flags from stack
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pop ax
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mov [reg_ip], ax
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pop ax
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mov [reg_cs], ax
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pop ax
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mov [reg_fl], ax
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; save the other registers
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mov [reg_cx], cx
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mov [reg_dx], dx
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mov [reg_bx], bx
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mov [reg_sp], sp
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mov [reg_bp], bp
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mov [reg_si], si
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mov [reg_di], di
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; save other segment registers we can access
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mov [reg_ss], ss
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mov [reg_es], es
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; initialize other segments and setup stack
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mov es, ax
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mov ss, ax
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mov sp, (stack+stacksize)
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; Names for bits in debug_frame+26 (FL/Flags register)
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; One character per bit, 16 bits total
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debug_frame_flags:
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db "++++ODIT"
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db "SZ+A+P+C"
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call printregs
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; Print a single register from the frame
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; in SI frame offset for register
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debug_frame_register_print:
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mov bx, debug_frame_names
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mov al, [cs:bx+si] ; first name char load
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call putc
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mov al, [cs:bx+si+1] ; second name char load
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call putc
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mov al, '='
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call putc
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mov ax, [ss:bp+si] ; value load
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; prepare call to print_number
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push bx
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push cx
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mov bx, 0x0010
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mov cx, 3
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call print_number_padded
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pop cx
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pop bx
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mov al, ' '
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call putc
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ret
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hlt: hlt
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jmp hlt
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debug_frame_print:
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mov si, 0
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mov cx, 8
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.reg1loop:
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call debug_frame_register_print
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add si, 2
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loop .reg1loop
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names: db "AXCXDXBXSPBPSIDI"
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db "DSESSSCSIPFL"
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mov dx, [ss:bp+26]
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mov di, debug_frame_flags
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mov cx, 0x0010
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.flag_loop:
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mov al, [cs:di]
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inc di
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cmp al, '+'
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je .next
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test dx, 0x8000
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jnz .write
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mov al, '-'
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.write:
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call putc
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.next:
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sal dx, 1
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loop .flag_loop
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codeend:
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call printf
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db 0x0A, 0x0D, 0
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reg_ax: dw 0
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reg_cx: dw 0
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reg_dx: dw 0
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reg_bx: dw 0
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reg_sp: dw 0
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reg_bp: dw 0
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reg_si: dw 0
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reg_di: dw 0
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mov si, 16
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mov cx, 5
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.reg2loop:
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call debug_frame_register_print
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add si, 2
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loop .reg2loop
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reg_es: dw 0
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reg_cs: dw 0
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reg_ss: dw 0
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reg_ds: dw 0
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call printf
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db 0x0A, 0x0D, 0
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reg_ip: dw 0
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reg_fl: dw 0
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ret
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isr_divide_error:
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push8086
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call printf
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db 0x0A, 0x0D, "INT 0 - DIVIDE ERROR", 0x0A, 0x0D, 0
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call debug_frame_print
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jmp halt
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isr_singlestep:
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push8086
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call printf
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db 0x0A, 0x0D, 0
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call debug_frame_print
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; wait for keypress
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xor ax, ax
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int 0x16
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; enable trace flag so we fire again after next instruction
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or word [ss:bp+26], 0x0100
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pop8086
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iret
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isr_nmi:
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push8086
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call printf
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db 0x0A, 0x0D, "INT 2 - NON-MASKABLE INTERRUPT", 0x0A, 0x0D, 0
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call debug_frame_print
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jmp halt
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isr_breakpoint:
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push8086
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call printf
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db 0x0A, 0x0D, 0
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call debug_frame_print
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pop8086
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iret
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isr_overflow:
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push8086
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call printf
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db 0x0A, 0x0D, "INT 4 - OVERFLOW", 0x0A, 0x0D, 0
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call debug_frame_print
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jmp halt
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isr_invalid_opcode:
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push8086
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call printf
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db 0x0A, 0x0D, "INT 6 - INVALID OPCODE", 0x0A, 0x0D, 0
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call debug_frame_print
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jmp halt
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halt:
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call printf
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db "HALTED", 0x0A, 0x0D, 0
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.loop:
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hlt
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jmp halt
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%include "printf.asm"
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stack: times stacksize dw 0
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align 512
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@ -1,43 +0,0 @@
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cpu 8086
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org 0x0000
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db 0x55, 0xAA
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db 0x00
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jmp init
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nop
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times (0x18 - ($-$$)) db 0
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dw 0
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dw pnp
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pnp:
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db "$PnP"
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.version:
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db 1 ; version 1
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.length:
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db 2 ; 2 * 16 length
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dw 0 ; offset of next header
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db 0
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.checksum:
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db 0 ; checksum (filled by fix-rom)
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dd 0 ; device identifier
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dw 0 ; manufacturer string
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dw name ; product name string
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db 0,0,0 ; device type string
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db 0x20 ; device indicator, bit for "read cacheable" set
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dw 0 ; boot connection vector
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dw 0 ; boot disconnect vector
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dw 0 ; bootstrap entry point
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dw 0 ; reserved
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dw 0
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name:
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db "rdos drv loader"
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init:
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mov ax, 0x0e37
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xor bx, bx
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int 0x10
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retf
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align 512
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