VisionFive2 Linux kernel

author: Barry Song <song.bao.hua@hisilicon.com> 2021-05-06 18:05:09 -0700 committer: Linus Torvalds <torvalds@linux-foundation.org> 2021-05-07 00:26:33 -0700 commit: 526940e3962620f1a24d5e30c3dac7358194d963 parent: dc9586823f3e06867344e6cf88741688c2c7737f

Commit Summary:

scripts/gdb: add lx_current support for arm64

Diffstat:

1 file changed, 12 insertions, 0 deletions

diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py
index f382762509d3..15fc4626d236 100644
--- a/scripts/gdb/linux/cpus.py
+++ b/scripts/gdb/linux/cpus.py
@@ -16,6 +16,9 @@ import gdb
 from linux import tasks, utils
 
 
+task_type = utils.CachedType("struct task_struct")
+
+
 MAX_CPUS = 4096
 
 
@@ -157,9 +160,19 @@ Note that VAR has to be quoted as string."""
 PerCpu()
 
 def get_current_task(cpu):
+    task_ptr_type = task_type.get_type().pointer()
+
     if utils.is_target_arch("x86"):
          var_ptr = gdb.parse_and_eval("&current_task")
          return per_cpu(var_ptr, cpu).dereference()
+    elif utils.is_target_arch("aarch64"):
+         current_task_addr = gdb.parse_and_eval("$SP_EL0")
+         if((current_task_addr >> 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(EL0)")
     else:
         raise gdb.GdbError("Sorry, obtaining the current task is not yet "
                            "supported with this arch")