[binutils-gdb] gdbserver: LoongArch: Add orig_a0 processing

[Tiezhu Yang <yangtiezhu@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=74baa6cd1c8168705a39d45f317cc9f79e31ac3a

commit 74baa6cd1c8168705a39d45f317cc9f79e31ac3a
Author: Youling Tang <tangyouling@loongson.cn>
Date:   Sun Jul 10 10:57:33 2022 +0800

    gdbserver: LoongArch: Add orig_a0 processing
    
    Commit 736918239b16 ("gdb: LoongArch: add orig_a0 into register set")
    introduced orig_a0, similar processing needs to be done in gdbserver.
    
    At the same time, add orig_a0 related comments.
    
    Signed-off-by: Youling Tang <tangyouling@loongson.cn>
    Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Diff:
---
 gdb/loongarch-linux-nat.c        | 4 ++--
 gdbserver/linux-loongarch-low.cc | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/gdb/loongarch-linux-nat.c b/gdb/loongarch-linux-nat.c
index 1fd1af6c99f..1b4a37c94fb 100644
--- a/gdb/loongarch-linux-nat.c
+++ b/gdb/loongarch-linux-nat.c
@@ -44,7 +44,7 @@ protected:
 			       int store_p) override;
 };
 
-/* Fill GDB's register array with the general-purpose, pc and badv
+/* Fill GDB's register array with the general-purpose, orig_a0, pc and badv
    register values from the current thread.  */
 
 static void
@@ -70,7 +70,7 @@ fetch_gregs_from_thread (struct regcache *regcache, int regnum, pid_t tid)
   }
 }
 
-/* Store to the current thread the valid general-purpose, pc and badv
+/* Store to the current thread the valid general-purpose, orig_a0, pc and badv
    register values in the GDB's register array.  */
 
 static void
diff --git a/gdbserver/linux-loongarch-low.cc b/gdbserver/linux-loongarch-low.cc
index 7b81e4b786a..91826b42361 100644
--- a/gdbserver/linux-loongarch-low.cc
+++ b/gdbserver/linux-loongarch-low.cc
@@ -99,6 +99,7 @@ loongarch_fill_gregset (struct regcache *regcache, void *buf)
 
   for (i = 1; i < 32; i++)
     collect_register (regcache, i, *regset + i);
+  collect_register (regcache, LOONGARCH_ORIG_A0_REGNUM, *regset + LOONGARCH_ORIG_A0_REGNUM);
   collect_register (regcache, LOONGARCH_PC_REGNUM, *regset + LOONGARCH_PC_REGNUM);
   collect_register (regcache, LOONGARCH_BADV_REGNUM, *regset + LOONGARCH_BADV_REGNUM);
 }
@@ -114,6 +115,7 @@ loongarch_store_gregset (struct regcache *regcache, const void *buf)
   supply_register_zeroed (regcache, 0);
   for (i = 1; i < 32; i++)
     supply_register (regcache, i, *regset + i);
+  supply_register (regcache, LOONGARCH_ORIG_A0_REGNUM, *regset + LOONGARCH_ORIG_A0_REGNUM);
   supply_register (regcache, LOONGARCH_PC_REGNUM, *regset + LOONGARCH_PC_REGNUM);
   supply_register (regcache, LOONGARCH_BADV_REGNUM, *regset + LOONGARCH_BADV_REGNUM);
 }