sim: callback: add human readable strings for debugging to maps

When tracing, we often want to display the human readable name for the
various syscall/errno values.  Rather than make each target duplicate
the lookup, extend the existing maps to include the string directly,
and add helper functions to look up the constants.

While most targets are autogenerated (from libgloss), the bfin/cris
targets have custom maps for the Linux ABI which need to be updated
by hand.

1 files changed, 82 insertions, 12 deletions

diff --git a/sim/common/callback.c b/sim/common/callback.c
index f295641..9b42536 100644
--- a/sim/common/callback.c
+++ b/sim/common/callback.c
@@ -796,6 +796,32 @@ cb_read_target_syscall_maps (host_callback *cb, const char *file)
   return CB_RC_OK;
 }
 
+/* General utility functions to search a map for a value.  */
+
+static const CB_TARGET_DEFS_MAP *
+cb_target_map_entry (const CB_TARGET_DEFS_MAP map[], int target_val)
+{
+  const CB_TARGET_DEFS_MAP *m;
+
+  for (m = &map[0]; map->target_val != -1; ++m)
+    if (m->target_val == target_val)
+      return m;
+
+  return NULL;
+}
+
+static const CB_TARGET_DEFS_MAP *
+cb_host_map_entry (const CB_TARGET_DEFS_MAP map[], int host_val)
+{
+  const CB_TARGET_DEFS_MAP *m;
+
+  for (m = &map[0]; map->host_val != -1; ++m)
+    if (m->host_val == host_val)
+      return m;
+
+  return NULL;
+}
+
 /* Translate the target's version of a syscall number to the host's.
    This isn't actually the host's version, rather a canonical form.
    ??? Perhaps this should be renamed to ..._canon_syscall.  */
@@ -803,13 +829,10 @@ cb_read_target_syscall_maps (host_callback *cb, const char *file)
 int
 cb_target_to_host_syscall (host_callback *cb, int target_val)
 {
-  CB_TARGET_DEFS_MAP *m;
-
-  for (m = &cb->syscall_map[0]; m->target_val != -1; ++m)
-    if (m->target_val == target_val)
-      return m->host_val;
+  const CB_TARGET_DEFS_MAP *m =
+    cb_target_map_entry (cb->syscall_map, target_val);
 
-  return -1;
+  return m ? m->host_val : -1;
 }
 
 /* FIXME: sort tables if large.
@@ -821,16 +844,12 @@ cb_target_to_host_syscall (host_callback *cb, int target_val)
 int
 cb_host_to_target_errno (host_callback *cb, int host_val)
 {
-  CB_TARGET_DEFS_MAP *m;
-
-  for (m = &cb->errno_map[0]; m->host_val; ++m)
-    if (m->host_val == host_val)
-      return m->target_val;
+  const CB_TARGET_DEFS_MAP *m = cb_host_map_entry (cb->errno_map, host_val);
 
   /* ??? Which error to return in this case is up for grabs.
      Note that some missing values may have standard alternatives.
      For now return 0 and require caller to deal with it.  */
-  return 0;
+  return m ? m->target_val : 0;
 }
 
 /* Given a set of target bitmasks for the open system call,
@@ -1045,3 +1064,54 @@ cb_is_stderr (host_callback *cb, int fd)
 {
   return fdbad (cb, fd) ? 0 : fdmap (cb, fd) == 2;
 }
+
+const char *
+cb_host_str_syscall (host_callback *cb, int host_val)
+{
+  const CB_TARGET_DEFS_MAP *m = cb_host_map_entry (cb->syscall_map, host_val);
+
+  return m ? m->name : NULL;
+}
+
+const char *
+cb_host_str_errno (host_callback *cb, int host_val)
+{
+  const CB_TARGET_DEFS_MAP *m = cb_host_map_entry (cb->errno_map, host_val);
+
+  return m ? m->name : NULL;
+}
+
+const char *
+cb_host_str_signal (host_callback *cb, int host_val)
+{
+  const CB_TARGET_DEFS_MAP *m = cb_host_map_entry (cb->signal_map, host_val);
+
+  return m ? m->name : NULL;
+}
+
+const char *
+cb_target_str_syscall (host_callback *cb, int target_val)
+{
+  const CB_TARGET_DEFS_MAP *m =
+    cb_target_map_entry (cb->syscall_map, target_val);
+
+  return m ? m->name : NULL;
+}
+
+const char *
+cb_target_str_errno (host_callback *cb, int target_val)
+{
+  const CB_TARGET_DEFS_MAP *m =
+    cb_target_map_entry (cb->errno_map, target_val);
+
+  return m ? m->name : NULL;
+}
+
+const char *
+cb_target_str_signal (host_callback *cb, int target_val)
+{
+  const CB_TARGET_DEFS_MAP *m =
+    cb_target_map_entry (cb->signal_map, target_val);
+
+  return m ? m->name : NULL;
+}