[binutils-gdb] gdb: LoongArch: Modify the result of the info reg command

[Tiezhu Yang]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=9d7c73af4bf5f1d416a90ec5327279b6f1092a83

commit 9d7c73af4bf5f1d416a90ec5327279b6f1092a83
Author: Hui Li <lihui@loongson.cn>
Date:   Thu Feb 16 08:59:10 2023 +0800

    gdb: LoongArch: Modify the result of the info reg command
    
    The "info register" command should only display general registers,
    but it shows the information of all registers in the current code,
    add loongarch_register_reggroup_p() so that we can get the expected
    result.
    
    Signed-off-by: Hui Li <lihui@loongson.cn>
    Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Diff:
---
 gdb/loongarch-tdep.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/gdb/loongarch-tdep.c b/gdb/loongarch-tdep.c
index 5f7a8a00ce7..67ea5494d90 100644
--- a/gdb/loongarch-tdep.c
+++ b/gdb/loongarch-tdep.c
@@ -24,6 +24,7 @@
 #include "frame-unwind.h"
 #include "gdbcore.h"
 #include "loongarch-tdep.h"
+#include "reggroups.h"
 #include "target.h"
 #include "target-descriptions.h"
 #include "trad-frame.h"
@@ -1433,6 +1434,43 @@ loongarch_find_default_target_description (const struct gdbarch_info info)
   return loongarch_lookup_target_description (features);
 }
 
+static int
+loongarch_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+			       const struct reggroup *group)
+{
+  if (gdbarch_register_name (gdbarch, regnum) == NULL
+      || *gdbarch_register_name (gdbarch, regnum) == '\0')
+    return 0;
+
+  int raw_p = regnum < gdbarch_num_regs (gdbarch);
+
+  if (group == save_reggroup || group == restore_reggroup)
+    return raw_p;
+
+  if (group == all_reggroup)
+    return 1;
+
+  if (0 <= regnum && regnum <= LOONGARCH_BADV_REGNUM)
+    return group == general_reggroup;
+
+  /* Only ORIG_A0, PC, BADV in general_reggroup */
+  if (group == general_reggroup)
+    return 0;
+
+  if (LOONGARCH_FIRST_FP_REGNUM <= regnum && regnum <= LOONGARCH_FCSR_REGNUM)
+    return group == float_reggroup;
+
+  /* Only $fx / $fccx / $fcsr in float_reggroup */
+  if (group == float_reggroup)
+    return 0;
+
+  int ret = tdesc_register_in_reggroup_p (gdbarch, regnum, group);
+  if (ret != -1)
+    return ret;
+
+  return default_register_reggroup_p (gdbarch, regnum, group);
+}
+
 /* Initialize the current architecture based on INFO  */
 
 static struct gdbarch *
@@ -1586,6 +1624,7 @@ loongarch_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
   /* Hook in OS ABI-specific overrides, if they have been registered.  */
   gdbarch_init_osabi (info, gdbarch);
+  set_gdbarch_register_reggroup_p (gdbarch, loongarch_register_reggroup_p);
 
   return gdbarch;
 }