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2021-02-13sim: switch to AC_CONFIG_MACRO_DIRSMike Frysinger4-1834/+35
Rather than hand maintain m4 includes in various autotool files, use AC_CONFIG_MACRO_DIRS to declare the relevant search paths. This simplifies the code, makes it more robust, and cleans out unused logic from configure.
2021-02-06sim: common: switch AC_CONFIG_HEADERSMike Frysinger1-3/+2
The AC_CONFIG_HEADER macro is long deprecated, so switch to the newer form. This also gets rid of the position limitation, and drops support for an argument to SIM_AC_COMMON which we haven't used anywhere.
2021-02-06sim: drop use of bfd/configure.hostMike Frysinger2-6/+6
These settings might have made sense in darker compiler times, but I think they're largely obsolete now. Looking through the values that get used in HDEFINES, it's quite limited, and configure itself should handle them. If we still need something, we can leverage standard autoconf macros instead, after we get a clear user report. TDEFINES was never set anywhere and was always empty, so prune that.
2021-02-04gdb: riscv: enable sim integrationMike Frysinger2-0/+76
Now the simulator can be loaded via gdb using "target sim".
2021-02-04sim: riscv: new portMike Frysinger12-0/+18137
This is a hand-written implementation that should have fairly complete coverage for the base integer instruction set ("i"), and for the atomic ("a") and integer multiplication+division ("m") extensions. It also covers 32-bit & 64-bit targets. The unittest coverage is a bit weak atm, but should get better.