[PATCH] gdb-script: updated lx_current for riscv

[debug@rivosinc.com]

From: Deepak Gupta <debug@rivosinc.com>

lx_current python gdb command defined in scripts/gdb/cpus.py updated
to support riscv architecture.

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
---
 scripts/gdb/linux/cpus.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py
index 15fc4626d236..ce6703f1e35a 100644
--- a/scripts/gdb/linux/cpus.py
+++ b/scripts/gdb/linux/cpus.py
@@ -173,6 +173,14 @@ def get_current_task(cpu):
          else:
              raise gdb.GdbError("Sorry, obtaining the current task is not allowed "
                                 "while running in userspace(EL0)")
+    elif utils.is_target_arch("riscv"):
+         current_task_addr = gdb.parse_and_eval("$tp")
+         if((current_task_addr.cast(utils.get_long_type()) >> 63) != 0):
+             current_task = current_task_addr.cast(task_ptr_type)
+             return current_task.dereference()
+         else:
+             raise gdb.GdbError("Sorry, obtaining the current task is not allowed "
+                                "while running in userspace")
     else:
         raise gdb.GdbError("Sorry, obtaining the current task is not yet "
                            "supported with this arch")
-- 
2.25.1