Hi, Please find the attached patch to avoid saving of EXR register for monitor functions.
By default, in prologue code of a monitor function, EXR register is pushed onto the stack. This implementation is not required for H8S/224x and 21xx variants of H8S controllers. The behavior can be controlled with option "-mno-exr". Built compiler is only for compiling C language source code. No regression found with this patch. Compiler behavior with different command line options used for compilation of code after applying this patch is given below: * h8300-elf-gcc -mn -S test.c test.c:1:0: error: -mn is used without -mh or -ms or -msx * h8300-elf-gcc -mh -mexr -S test.c test.c:1:0: error: -mexr is used without -ms * h8300-elf-gcc -mh -mno-exr -S test.c test.c:1:0: warning: -mno-exr valid only with -ms or -msx - Option ignored! [-mno-exr] * Generated assembly without option '-mno-exr': _testmonitor: stc exr,@-er7 mov.l er0,@-er7 stc ccr,r0l * Generated assembly with option '-mno-exr': _testmonitor: mov.l er0,@-er7 stc ccr,r0l Please review the patch and let me know if there should be any modifications in it? Regards, Sandeep Kumar Singh, KPIT Cummins InfoSystems Ltd. Pune, India