gdb/linux-tdep.c: Add Perms to the 'info proc mappings' output

[binutils-gdb.git] / gdb / arch / riscv.c

diff --git a/gdb/arch/riscv.c b/gdb/arch/riscv.c
index ca2238d5d705f05a38061a7f4e5c2428219d3202..030c2cfdd98ecd2971018cbbc1ae482175313051 100644 (file)
--- a/gdb/arch/riscv.c
+++ b/gdb/arch/riscv.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2018 Free Software Foundation, Inc.
+/* Copyright (C) 2018-2022 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -15,27 +15,41 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#include "common-defs.h"
+#include "gdbsupport/common-defs.h"
 #include "riscv.h"
 #include <stdlib.h>
+#include <unordered_map>
 
 #include "../features/riscv/32bit-cpu.c"
 #include "../features/riscv/64bit-cpu.c"
 #include "../features/riscv/32bit-fpu.c"
 #include "../features/riscv/64bit-fpu.c"
+#include "../features/riscv/rv32e-xregs.c"
+
+#ifndef GDBSERVER
+#define STATIC_IN_GDB static
+#else
+#define STATIC_IN_GDB
+#endif
 
 /* See arch/riscv.h.  */
 
-target_desc *
-riscv_create_target_description (struct riscv_gdbarch_features features)
+STATIC_IN_GDB target_desc_up
+riscv_create_target_description (const struct riscv_gdbarch_features features)
 {
-  target_desc *tdesc = allocate_target_description ();
+  /* Now we should create a new target description.  */
+  target_desc_up tdesc = allocate_target_description ();
 
 #ifndef IN_PROCESS_AGENT
   std::string arch_name = "riscv";
 
   if (features.xlen == 4)
-    arch_name.append (":rv32i");
+    {
+      if (features.embedded)
+       arch_name.append (":rv32e");
+      else
+       arch_name.append (":rv32i");
+    }
   else if (features.xlen == 8)
     arch_name.append (":rv64i");
   else if (features.xlen == 16)
@@ -48,22 +62,75 @@ riscv_create_target_description (struct riscv_gdbarch_features features)
   else if (features.flen == 16)
     arch_name.append ("q");
 
-  set_tdesc_architecture (tdesc, arch_name.c_str ());
+  set_tdesc_architecture (tdesc.get (), arch_name.c_str ());
 #endif
 
   long regnum = 0;
 
   /* For now we only support creating 32-bit or 64-bit x-registers.  */
   if (features.xlen == 4)
-    regnum = create_feature_riscv_32bit_cpu (tdesc, regnum);
+    {
+      if (features.embedded)
+       regnum = create_feature_riscv_rv32e_xregs (tdesc.get (), regnum);
+      else
+       regnum = create_feature_riscv_32bit_cpu (tdesc.get (), regnum);
+    }
   else if (features.xlen == 8)
-    regnum = create_feature_riscv_64bit_cpu (tdesc, regnum);
+    regnum = create_feature_riscv_64bit_cpu (tdesc.get (), regnum);
 
   /* For now we only support creating 32-bit or 64-bit f-registers.  */
   if (features.flen == 4)
-    regnum = create_feature_riscv_32bit_fpu (tdesc, regnum);
+    regnum = create_feature_riscv_32bit_fpu (tdesc.get (), regnum);
   else if (features.flen == 8)
-    regnum = create_feature_riscv_64bit_fpu (tdesc, regnum);
+    regnum = create_feature_riscv_64bit_fpu (tdesc.get (), regnum);
+
+  /* Currently GDB only supports vector features coming from remote
+     targets.  We don't support creating vector features on native targets
+     (yet).  */
+  if (features.vlen != 0)
+    error (_("unable to create vector feature"));
 
   return tdesc;
 }
+
+#ifndef GDBSERVER
+
+/* Wrapper used by std::unordered_map to generate hash for feature set.  */
+struct riscv_gdbarch_features_hasher
+{
+  std::size_t
+  operator() (const riscv_gdbarch_features &features) const noexcept
+  {
+    return features.hash ();
+  }
+};
+
+/* Cache of previously seen target descriptions, indexed by the feature set
+   that created them.  */
+static std::unordered_map<riscv_gdbarch_features,
+                         const target_desc_up,
+                         riscv_gdbarch_features_hasher> riscv_tdesc_cache;
+
+/* See arch/riscv.h.  */
+
+const target_desc *
+riscv_lookup_target_description (const struct riscv_gdbarch_features features)
+{
+  /* Lookup in the cache.  If we find it then return the pointer out of
+     the target_desc_up (which is a unique_ptr).  This is safe as the
+     riscv_tdesc_cache will exist until GDB exits.  */
+  const auto it = riscv_tdesc_cache.find (features);
+  if (it != riscv_tdesc_cache.end ())
+    return it->second.get ();
+
+  target_desc_up tdesc (riscv_create_target_description (features));
+
+  /* Add to the cache, and return a pointer borrowed from the
+     target_desc_up.  This is safe as the cache (and the pointers
+     contained within it) are not deleted until GDB exits.  */
+  target_desc *ptr = tdesc.get ();
+  riscv_tdesc_cache.emplace (features, std::move (tdesc));
+  return ptr;
+}
+
+#endif /* !GDBSERVER */