Int 31/AX=0203h

DPMI 0.9+ - SET PROCESSOR EXCEPTION HANDLER VECTOR

AX = 0203h
BL = exception number (00h-1Fh)
CX:(E)DX = selector:offset of handler

Return:
CF clear if successful
CF set on error
AX = error code (DPMI 1.0+) (8021h,8022h) (see #03143)

Notes: 32-bit programs must supply an offset in EDX and use a 32-bit interrupt stack frame on chaining to the next exception handler. The handler should return using a FAR return. All fault stack frames contain an error code, but it is only valid for exceptions 08h and 0Ah-0Eh. Handlers will only be called if the exception occurs in protected mode, and the DPMI host does not transparently handle the exception. The handler may change certain values on the stack frame (see #03146,#03147). DPMI 1.0+ supports this function only for backward compatibility; use AX=0212h or AX=0213h instead. Not supported by MS Windows 3.0 in Standard mode

See Also: AX=0202h - AX=0212h - AX=0213h - INT 2F/AX=FB42


Format of stack frame for 16-bit programs:
(offset from SS:SP)

Offset  Size    Description     (Table 03146)
00h    DWORD   return CS:IP (do not change)
04h    WORD    error code
06h    DWORD   CS:IP of exception
0Ah    WORD    flags
0Ch    DWORD   SS:SP

Format of stack frame for 32-bit programs:
(offset from SS:ESP)

Offset  Size    Description     (Table 03147)
00h    DWORD   return EIP (do not change)
04h    WORD    return CS selector (do not change)
06h    WORD    reserved (do not change)
08h    DWORD   error code
0Ch    DWORD   EIP of exception
10h    WORD    CS selector of exception
12h    WORD    reserved (do not change)
14h    DWORD   EFLAGS
18h    DWORD   ESP
1Ch    WORD    SS
1Eh    WORD    reserved (do not change)

Category: DOS Extenders - Int 31h - D

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