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kernel
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Fixed bugs in entry.asm: stack segment and int 2A/82 Ralf Brown compliant. 

git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@179 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2001-03-27 02:56:58 +00:00
parent 58a5fa4438
commit d233a1d304
2 changed files with 18 additions and 8 deletions
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3
docs/history.txt
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@ -1,3 +1,6 @@
2001 Mar 27 - Build 2023
-------- Bart Oldeman (bart.oldeman@bristol.ac.uk)
+ Fixes Bug fix release 2023a: fixed stack segment bug in entry.asm.
2001 Mar 25 - Build 2023
-------- Bart Oldeman (bart.oldeman@bristol.ac.uk)
+ Fixes sys.com compilation: it is a proper .com and works again.

23
kernel/entry.asm
View File

@ -28,6 +28,9 @@
; $Id$
;
; $Log$
; Revision 1.7 2001/03/27 02:56:58 bartoldeman
; Fixed bugs in entry.asm: stack segment and int 2A/82 Ralf Brown compliant.
;
; Revision 1.6 2001/03/24 22:13:05 bartoldeman
; See history.txt: dsk.c changes, warning removal and int21 entry handling.
;
@ -219,7 +222,7 @@ reloc_call_int21_handler:
; NB: stack frame is MS-DOS dependent and not compatible
; with compiler interrupt stack frames.
;
sti
sti
PUSH$ALL
;
@ -255,12 +258,12 @@ int21_user:
;
; DX=DGROUP
; CX=STACK
; AX=userSS
; SI=userSS
; BX=userSP
int21_1:
mov ax,ss ; save user stack, to be retored later
mov si,ss ; save user stack, to be retored later
mov bx,sp
@ -304,7 +307,7 @@ int21_onerrorstack:
mov sp,cx
sti
push ax ; user SS:SP
push si ; user SS:SP
push bx
call _int21_service
@ -312,9 +315,13 @@ int21_onerrorstack:
int21_2: inc byte [_InDOS]
mov cx,_char_api_tos
or ah,ah
jz int21_3
cmp ah,0ch
mov cx,_char_api_tos
jle int21_normalentry
cmp ah,59h
je int21_normalentry
int21_3:
call dos_crit_sect
@ -332,7 +339,7 @@ int21_normalentry:
; int21_syscall and remainder of kernel.
;
push ax ; user SS:SP
push si ; user SS:SP
push bx
call _int21_service
@ -346,10 +353,10 @@ int21_exit: dec byte [_InDOS]
int21_exit_nodec:
pop bx ; get back user stack
pop ax
pop si
cli
mov ss,ax
mov ss,si
mov sp,bx
sti
int21_ret: POP$ALL