Q64535

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Q64535: IRET Can't Be Used with proc USES

Article: Q64535
Version(s): 5.10 5.10a | 5.10 5.10a
Operating System: MS-DOS     | OS/2
Flags: ENDUSER |
Last Modified: 17-OCT-1990

A procedure that uses the USES keyword cannot return by using IRET.
The USES statement pushes the specified registers on the stack upon
entry and pops them before exiting a procedure. If the USES keyword is
used with a procedure that ends with an IRET instruction, the pushes
will be generated for the procedure, but the pops will not.

The following code demonstrates the problem:

The Source File
---------------

.model large,c

.code
proctest segment 'CODE'

first proc far uses di si bp
      mov si,3
      mov di,4
      iret
first end
      end first

The Assembled Listing
---------------------

assume cs:@code,ds:@data,ss:@data

proctest_TEXT segment 'CODE'

first  proc far uses di si bp

push DI
push SI
push BP
      mov si,3
      mov di,4
                    <--- missing pops for bp,si, and di
      iret
first  endp
      end  first
@CurSeg ends