Category : C++ Source Code
Archive   : VCCRT2.ZIP
Filename : CRT0FP.ASM

page ,132
title crt0fp - floating point not loaded trap
;***
;crt0fp.asm - floating point not loaded trap
;
; Copyright (c) 1986-1992, Microsoft Corporation, All Rights Reserved
;
;Purpose:
; To trap certain cases where certain necessary floating-point
; software is not loaded. Two specific cases are when 87.LIB
; is linked in but no coprocessor is present, and when floating
; point i/o conversions are done, but no floating-point variables
; or expressions are used in the program.
;
;*******************************************************************************

?DF= 1 ; this is special for c startup
include version.inc
.xlist
include cmacros.inc
include defsegs.inc
include rterr.inc
.list

CrtDefSegs
CrtDefSegs

; Messages used by _fptrap

sBegin nmsg
assumes ds,data

_RTERR _RT_FLOAT, _RT_FLOAT_TXT, _RT_STANDARD ; 'floating-point support not loaded'

sEnd

sBegin npad
assumes ds,data
dw -1
; no padding for now;
; MAX padding would be
; db 22 dup(0)
sEnd

sBegin code
assumes cs,code

externNP _amsg_exit

page
;***
;_fptrap - trap for missing floating-point software
;
;Purpose:
; Catches these cases of incomplete f.p. software linked into a program.
;
; (1) 87.LIB chosen, but no coprocessor present;
; (i.e., emulator not linked)
;
; (2) "%e", "%f", and "%g" i/o conversion formats specified, but
; not all conversion software has been linked in, because the
; program did not use any floating-point variables or expressions.
;
;Entry:
; None.
;
;Exit:
; None.
;
;Uses:
; AX.
;
;Exceptions:
; Transfers control to _amsg_exit which ...
; - Writes error message to standard error: "floating point not loaded";
; - Terminates the program by calling _exit().
;*******************************************************************************

labelNP

ifdef _LOAD_DGROUP
; push ds ; no need to save ds since program will dying
mov ax, DGROUP
mov ds, ax
endif ;_LOAD_DGROUP

mov ax,_RT_FLOAT ; issue floating point not loaded
jmp _amsg_exit ; and die

sEnd code

end