A C program calls an assembly language program to test if
.ENTER and .LEAVE
are working correctly. The assembly language program checks to see
if the C program has passed the value zero in arg0.
The assembly language program then returns the value -9
in ret0 to the
calling program.
You need to compile this assembly listing using cc.
The registers ret0 and arg0
are declared within /usr/lib/pcc_prefix.s,
which is automatically included when you give the C compiler an
assembly file.
To remove the dependency on pcc_prefix.s,
replace all occurrences of ret0
with %r28 and arg0
with %r26.
C Program Listing |
 |
#include <stdio.h>
int errorcount = 0;
main ()
{
int toterr = 0;
printf("TESTING FEATURE 000");
fflush(stdout);
if( feat000(000) != -9 ) ++errorcount;
printf(" %d errors\\n",errorcount);
toterr += errorcount;
errorcount = 0;
} |
Assembly Program Listing |
|
; Assembler Module that passes results back to C driver module
myfeat .EQU 000
success .EQU -9
.CODE
.IMPORT errorcount,DATA
.SUBSPA $CODE$
.EXPORT feat000,ENTRY
.PROC
.CALLINFO
feat000 .ENTER
LDI 0,ret0
COMIB,<> myfeat,arg0,exit
NOP
LDI success,ret0
exit .LEAVE
.PROCEND
.END |
