Add --[no-]misaligned command-line options

They don't do anything yet.

ci-tests/testlib.c

@@ -21,6 +21,7 @@ int main()
 	    "rv64gcv",
 	    "MSU",
 	    "vlen:128,elen:64",
+	    false,
 	    endianness_little,
 	    16,
 	    mem_cfg,

riscv/cfg.h

@@ -52,6 +52,7 @@ public:
         const char *default_bootargs,
         const char *default_isa, const char *default_priv,
         const char *default_varch,
+        const bool default_misaligned,
         const endianness_t default_endianness,
         const reg_t default_pmpregions,
         const std::vector<mem_cfg_t> &default_mem_layout,
@@ -62,6 +63,7 @@ public:
       isa(default_isa),
       priv(default_priv),
       varch(default_varch),
+      misaligned(default_misaligned),
       endianness(default_endianness),
       pmpregions(default_pmpregions),
       mem_layout(default_mem_layout),
@@ -75,6 +77,7 @@ public:
   cfg_arg_t<const char *>            isa;
   cfg_arg_t<const char *>            priv;
   cfg_arg_t<const char *>            varch;
+  bool                               misaligned;
   endianness_t                       endianness;
   reg_t                              pmpregions;
   cfg_arg_t<std::vector<mem_cfg_t>>  mem_layout;

spike_main/spike-log-parser.cc

@@ -33,6 +33,7 @@ int main(int UNUSED argc, char** argv)
             /*default_isa=*/DEFAULT_ISA,
             /*default_priv=*/DEFAULT_PRIV,
             /*default_varch=*/DEFAULT_VARCH,
+            /*default_misaligned=*/false,
             /*default_endianness*/endianness_little,
             /*default_pmpregions=*/16,
             /*default_mem_layout=*/std::vector<mem_cfg_t>(),

spike_main/spike.cc

@@ -49,6 +49,7 @@ static void help(int exit_code = 1)
   fprintf(stderr, "  --dc=<S>:<W>:<B>        W ways, and B-byte blocks (with S and\n");
   fprintf(stderr, "  --l2=<S>:<W>:<B>        B both powers of 2).\n");
   fprintf(stderr, "  --big-endian          Use a big-endian memory system.\n");
+  fprintf(stderr, "  --misaligned          Support misaligned memory accesses\n");
   fprintf(stderr, "  --device=<P,B,A>      Attach MMIO plugin device from an --extlib library\n");
   fprintf(stderr, "                          P -- Name of the MMIO plugin\n");
   fprintf(stderr, "                          B -- Base memory address of the device\n");
@@ -327,6 +328,7 @@ int main(int argc, char** argv)
             /*default_isa=*/DEFAULT_ISA,
             /*default_priv=*/DEFAULT_PRIV,
             /*default_varch=*/DEFAULT_VARCH,
+            /*default_misaligned=*/false,
             /*default_endianness*/endianness_little,
             /*default_pmpregions=*/16,
             /*default_mem_layout=*/parse_mem_layout("2048"),
@@ -399,6 +401,7 @@ int main(int argc, char** argv)
   parser.option(0, "dc", 1, [&](const char* s){dc.reset(new dcache_sim_t(s));});
   parser.option(0, "l2", 1, [&](const char* s){l2.reset(cache_sim_t::construct(s, "L2$"));});
   parser.option(0, "big-endian", 0, [&](const char UNUSED *s){cfg.endianness = endianness_big;});
+  parser.option(0, "misaligned", 0, [&](const char UNUSED *s){cfg.misaligned = true;});
   parser.option(0, "log-cache-miss", 0, [&](const char UNUSED *s){log_cache = true;});
   parser.option(0, "isa", 1, [&](const char* s){cfg.isa = s;});
   parser.option(0, "pmpregions", 1, [&](const char* s){cfg.pmpregions = atoul_safe(s);});