[binutils-gdb] gdb: LoongArch: Implement the iterate_over_regset_sections gdbarch method

[Tiezhu Yang <yangtiezhu@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a6b446b22270b52dd4739e9ab094e11b307ff0b5

commit a6b446b22270b52dd4739e9ab094e11b307ff0b5
Author: Tiezhu Yang <yangtiezhu@loongson.cn>
Date:   Mon May 23 15:53:06 2022 +0800

    gdb: LoongArch: Implement the iterate_over_regset_sections gdbarch method
    
    When execute the following command on LoongArch:
    
      make check-gdb TESTS="gdb.base/auxv.exp"
    
    there exist the following unsupported and failed testcases:
    
      UNSUPPORTED: gdb.base/auxv.exp: gcore
      FAIL: gdb.base/auxv.exp: load core file for info auxv on native core dump
      FAIL: gdb.base/auxv.exp: info auxv on native core dump
      FAIL: gdb.base/auxv.exp: matching auxv data from live and core
      UNSUPPORTED: gdb.base/auxv.exp: info auxv on gcore-created dump
      UNSUPPORTED: gdb.base/auxv.exp: matching auxv data from live and gcore
    
    we can see the following messages in gdb/testsuite/gdb.log:
    
      gcore /home/loongson/build.git/gdb/testsuite/outputs/gdb.base/auxv/auxv.gcore
      Target does not support core file generation.
      (gdb) UNSUPPORTED: gdb.base/auxv.exp: gcore
    
    In order to fix the above issues, implement the iterate_over_regset_sections
    gdbarch method to iterate over core file register note sections on LoongArch.
    
    By the way, with this patch, the failed testcases in gdb.base/corefile.exp
    and gdb.base/gcore.exp can also be fixed.
    
    Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Diff:
---
 gdb/loongarch-linux-tdep.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/gdb/loongarch-linux-tdep.c b/gdb/loongarch-linux-tdep.c
index 7e219c4b9a0..f13756dd003 100644
--- a/gdb/loongarch-linux-tdep.c
+++ b/gdb/loongarch-linux-tdep.c
@@ -20,6 +20,7 @@
 
 #include "defs.h"
 #include "glibc-tdep.h"
+#include "gregset.h"
 #include "inferior.h"
 #include "linux-tdep.h"
 #include "loongarch-tdep.h"
@@ -163,6 +164,18 @@ static const struct tramp_frame loongarch_linux_rt_sigframe =
   NULL
 };
 
+/* Implement the "iterate_over_regset_sections" gdbarch method.  */
+
+static void
+loongarch_iterate_over_regset_sections (struct gdbarch *gdbarch,
+					iterate_over_regset_sections_cb *cb,
+					void *cb_data,
+					const struct regcache *regcache)
+{
+  cb (".reg", sizeof (elf_gregset_t), sizeof (elf_gregset_t),
+      &loongarch_gregset, NULL, cb_data);
+}
+
 /* Initialize LoongArch Linux ABI info.  */
 
 static void
@@ -186,6 +199,9 @@ loongarch_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   /* Prepend tramp frame unwinder for signal.  */
   tramp_frame_prepend_unwinder (gdbarch, &loongarch_linux_rt_sigframe);
+
+  /* Core file support.  */
+  set_gdbarch_iterate_over_regset_sections (gdbarch, loongarch_iterate_over_regset_sections);
 }
 
 /* Initialize LoongArch Linux target support.  */