nero/rdos
1
0
Fork 0
Code Pull Requests Releases Activity

debug.rom: Implement cheapo versions of g and t commands

Browse Source
This commit is contained in:
Nero 2020-05-13 21:30:43 +00:00
parent 47037ad708
commit 1647e70cae
1 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
rom/debug.asm
View File

@ -49,7 +49,9 @@ init: push ds
shl ax, cl shl ax, cl
; load ES for relocate ; load ES for relocate
mov es, ax mov es, ax
; store interrupt vector ; store interrupt vectors
mov word [1*4], int3entry
mov word [1*4+2], es
mov word [3*4], int3entry mov word [3*4], int3entry
mov word [3*4+2], es mov word [3*4+2], es
; load DS for relocate ; load DS for relocate
@ -187,12 +189,21 @@ loop: ; new line & show prompt
runcmd: cmp al, 'r' runcmd: cmp al, 'r'
je printregs je printregs
cmp al, 'g'
je go
cmp al, 't'
je step
; print a question mark ; print a question mark
xor bx, bx xor bx, bx
mov ax, 0x0e3F mov ax, 0x0e3F
int 0x10 int 0x10
ret ret
go: and word [reg_fl+1], 0xfe
jmp return
step: or word [reg_fl+1], 0x03
return: ; restore stack pointer return: ; restore stack pointer
mov ss, [reg_ss] mov ss, [reg_ss]
mov sp, [reg_sp] mov sp, [reg_sp]