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From: Song Shuai <suagrfillet@gmail.com>
To: jan.kiszka@siemens.com, kbingham@kernel.org,
	paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu
Cc: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	Song Shuai <suagrfillet@gmail.com>
Subject: [PATCH] scripts/gdb: add lx_current support for riscv
Date: Wed, 22 Feb 2023 17:28:06 +0800	[thread overview]
Message-ID: <20230222092806.1824615-1-suagrfillet@gmail.com> (raw)

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@gmail.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


WARNING: multiple messages have this Message-ID (diff)
From: Song Shuai <suagrfillet@gmail.com>
To: jan.kiszka@siemens.com, kbingham@kernel.org,
	paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu
Cc: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	Song Shuai <suagrfillet@gmail.com>
Subject: [PATCH] scripts/gdb: add lx_current support for riscv
Date: Wed, 22 Feb 2023 17:28:06 +0800	[thread overview]
Message-ID: <20230222092806.1824615-1-suagrfillet@gmail.com> (raw)

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@gmail.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


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             reply	other threads:[~2023-02-22  9:33 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-22  9:28 Song Shuai [this message]
2023-02-22  9:28 ` [PATCH] scripts/gdb: add lx_current support for riscv Song Shuai

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