The zTPF OS implements a tracing facility for function entry and exit
which uses global flags and trace function addresses. The addresses of
the flags as well as the trace functions are currently hard-coded in
the zTPF specific GCC parts of the IBM Z back-end.
With this patch these addresses can be changed at compile-time using
the new command line options. For convenience one additional command
line option (-mtpf-trace-skip) implements a new set of hard-coded
addresses.
gcc/ChangeLog:
2020-03-04 Andreas Krebbel <krebbel@linux.ibm.com>
* config/s390/s390.c (s390_emit_prologue): Specify the 2 new
operands to the prologue_tpf expander.
(s390_emit_epilogue): Likewise.
(s390_option_override_internal): Do error checking and setup for
the new options.
* config/s390/tpf.h (TPF_TRACE_PROLOGUE_CHECK)
(TPF_TRACE_EPILOGUE_CHECK, TPF_TRACE_PROLOGUE_TARGET)
(TPF_TRACE_EPILOGUE_TARGET, TPF_TRACE_PROLOGUE_SKIP_TARGET)
(TPF_TRACE_EPILOGUE_SKIP_TARGET): New macro definitions.
* config/s390/tpf.md ("prologue_tpf", "epilogue_tpf"): Add two new
operands for the check flag and the branch target.
* config/s390/tpf.opt ("mtpf-trace-hook-prologue-check")
("mtpf-trace-hook-prologue-target")
("mtpf-trace-hook-epilogue-check")
("mtpf-trace-hook-epilogue-target", "mtpf-trace-skip"): New
options.
* doc/invoke.texi: Document -mtpf-trace-skip option. The other
options are for debugging purposes and will not be documented
here.
