Article: Q59127
Product(s): Microsoft Macro Assembler
Version(s): 5.1
Operating System(s):
Keyword(s):
Last Modified: 04-MAY-2001
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The information in this article applies to:
- Microsoft Macro Assembler (MASM), version 5.1
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SUMMARY
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The following code was used to view coprocessor instructions on an 80386 machine
with an 80387 coprocessor. It is a combination of the examples on Pages 384 and
385 of "Microsoft Macro Assembler 5.1 for the MS-DOS Operating System
Programmer's Guide."
.model small
.386
.387
.stack 100h
.data
m1 dd 1.0
m2 dd 2.0
.code
start proc
mov ax, @data ;load address of segment
mov ds, ax ; register
fld m1 ;push m1 into st(0)
fld m2 ;push m2 into st(0)
fadd m1 ;add m2 to st(0)
fstp m1 ;pop st(0) into m1
fst m2 ;copy st(0) into m2
fld1 ;push 1 into st(0)
fldpi ;push pi into st(0)
fadd ;add st(0) and st(1)
;and pop, place result in st(0)
start endp
end start
While assembling the above code, the .386 and .387 directives must be placed
below the .model directive to generate 16-bit segments. If placed above the
.model directive, 32-bit segments will be generated and will produce erroneous
results, as 32-bit segments cannot be run under DOS.
While running the code through CodeView, the number 7 entered in the dialog box
displays a dump of the present status of the chip.
Additional query words: 5.10
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Keywords :
Technology : kbMASMsearch kbAudDeveloper kbMASM510
Version : :5.1
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