Add regcache_map_supplies helper routine.

This helper can be used in the fetch_registers and store_registers
target methods to determine if a register set includes a specific
register.

1 files changed, 27 insertions, 0 deletions

diff --git a/gdb/regcache.c b/gdb/regcache.c
index ac44d71..672da05 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -1264,6 +1264,33 @@ regcache::collect_regset (const struct regset *regset,
   transfer_regset (regset, nullptr, regnum, nullptr, (gdb_byte *) buf, size);
 }
 
+/* See regcache.h  */
+
+bool
+regcache_map_supplies (const struct regcache_map_entry *map, int regnum,
+		       struct gdbarch *gdbarch, size_t size)
+{
+  int offs = 0, count;
+
+  for (; (count = map->count) != 0; map++)
+    {
+      int regno = map->regno;
+      int slot_size = map->size;
+
+      if (slot_size == 0 && regno != REGCACHE_MAP_SKIP)
+	slot_size = register_size (gdbarch, regno);
+
+      if (regno != REGCACHE_MAP_SKIP && regnum >= regno
+	  && regnum < regno + count)
+	return offs + (regnum - regno + 1) * slot_size <= size;
+
+      offs += count * slot_size;
+      if (offs >= size)
+	return false;
+    }
+  return false;
+}
+
 /* See gdbsupport/common-regcache.h.  */
 
 bool