linux-kernel - [PATCH] scripts/gdb: add lx

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Date:   Wed, 22 Feb 2023 17:28:06 +0800
From:   Song Shuai <suagrfillet@...il.com>
To:     jan.kiszka@...mens.com, kbingham@...nel.org,
        paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu
Cc:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Song Shuai <suagrfillet@...il.com>
Subject: [PATCH] scripts/gdb: add lx_current support for riscv

RISC-V uses the tp register to save the current task_struct address
as its current() defines. So lx_current() of riscv just returns the
dereference of the address cast via task_ptr_type.

Signed-off-by: Song Shuai <suagrfillet@...il.com>
---
 scripts/gdb/linux/cpus.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py
index 15fc4626d236..b382016552e5 100644
--- a/scripts/gdb/linux/cpus.py
+++ b/scripts/gdb/linux/cpus.py
@@ -173,6 +173,9 @@ 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")
+         return current_task_addr.cast(task_ptr_type).dereference();
     else:
         raise gdb.GdbError("Sorry, obtaining the current task is not yet "
                            "supported with this arch")
-- 
2.20.1