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

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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 2001 Mar 25 - Build 2023
-------- Bart Oldeman (bart.oldeman@bristol.ac.uk) -------- Bart Oldeman (bart.oldeman@bristol.ac.uk)
+ Fixes sys.com compilation: it is a proper .com and works again. + Fixes sys.com compilation: it is a proper .com and works again.

21
kernel/entry.asm
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@ -28,6 +28,9 @@
; $Id$ ; $Id$
; ;
; $Log$ ; $Log$
; 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 ; Revision 1.6 2001/03/24 22:13:05 bartoldeman
; See history.txt: dsk.c changes, warning removal and int21 entry handling. ; See history.txt: dsk.c changes, warning removal and int21 entry handling.
; ;
@ -255,12 +258,12 @@ int21_user:
; ;
; DX=DGROUP ; DX=DGROUP
; CX=STACK ; CX=STACK
; AX=userSS ; SI=userSS
; BX=userSP ; BX=userSP
int21_1: 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 mov bx,sp
@ -304,7 +307,7 @@ int21_onerrorstack:
mov sp,cx mov sp,cx
sti sti
push ax ; user SS:SP push si ; user SS:SP
push bx push bx
call _int21_service call _int21_service
@ -312,9 +315,13 @@ int21_onerrorstack:
int21_2: inc byte [_InDOS] int21_2: inc byte [_InDOS]
cmp ah,0ch
mov cx,_char_api_tos mov cx,_char_api_tos
or ah,ah
jz int21_3
cmp ah,0ch
jle int21_normalentry jle int21_normalentry
cmp ah,59h
je int21_normalentry
int21_3: int21_3:
call dos_crit_sect call dos_crit_sect
@ -332,7 +339,7 @@ int21_normalentry:
; int21_syscall and remainder of kernel. ; int21_syscall and remainder of kernel.
; ;
push ax ; user SS:SP push si ; user SS:SP
push bx push bx
call _int21_service call _int21_service
@ -346,10 +353,10 @@ int21_exit: dec byte [_InDOS]
int21_exit_nodec: int21_exit_nodec:
pop bx ; get back user stack pop bx ; get back user stack
pop ax pop si
cli cli
mov ss,ax mov ss,si
mov sp,bx mov sp,bx
sti sti
int21_ret: POP$ALL int21_ret: POP$ALL