Microsoft KB Archive/51294

= Monitoring the Stack Using Assembly or C =

Article ID: 51294

Article Last Modified on 12/1/2003

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APPLIES TO


 * Microsoft FORTRAN Compiler 4.0
 * Microsoft FORTRAN Compiler 4.1
 * Microsoft FORTRAN Compiler 5.0
 * Microsoft FORTRAN Compiler 5.1
 * Microsoft FORTRAN Compiler 4.0
 * Microsoft FORTRAN Compiler 4.1
 * Microsoft FORTRAN Compiler 5.0
 * Microsoft FORTRAN Compiler 5.1

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This article was previously published under Q51294



SUMMARY
If, for any reason, you believe that the stack in a FORTRAN program is being corrupted, you can monitor the stack segment (SS) register and stack pointer (SP) register by using either the Microsoft Assembler package. Since CodeView may use the stack for its own purposes, this allows a more direct monitoring method.

A function for each package is shown below along with the appropriate interface statement. Each function returns an integer*4 to FORTRAN.

To extract the hexadecimal values from that integer, use a format statement something similar to the following example: write (*,'(1x,A7,1x,4Z,A1,4Z)') + 'seg:off',stackloc,':',ISHC(stackloc,16) This write statement produces video output of the following form:

seg:off 2BC0:111A



MORE INFORMATION
The assembly code and interface statement are shown below. interface to integer*4 function stackloc end integer*4 stackloc

.model large .code public stackloc stackloc proc mov dx,ss mov ax,sp ret stackloc endp end The equivalent interface for the following QuickC with Assembler code is also listed below (keep in mind that this code must be compiled with the /AL switch for memory model compatibility): interface to integer*4 function stackloc [C, + alias:'_stackloc'] end integer*4 stackloc

int * stackloc(void) {       int j[2];

_asm { mov    j[0],ss mov    j[1],sp }       return j; }

Additional query words: kbinf 5.00 nofps 5.10 debug watch view

Keywords: KB51294

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