Changeset 4074601 in mainline

Timestamp:

2009-12-30T00:33:22Z (14 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

b2a5b41

Parents:

e84037f

Message:

Clear the %i7 register in the task and thread entry functions to stop tracing
the stack beyond those points. Note that %fp cannot be used for this purpose
because it always needs to be a valid stack pointer. Change
frame_pointer_validate() accordingly.

Location:

uspace/lib/libc/arch/sparc64/src

Files:

• entry.s (modified) (1 diff)
• stacktrace.S (modified) (1 diff)
• thread_entry.s (modified) (1 diff)

uspace/lib/libc/arch/sparc64/src/entry.s

@@ -39 +39 @@
 #
 __entry:
+        #
+        # Stop stack traces in this function.
+        #
+        clr %i7
+
         # Pass pcb_ptr as the first argument to __main()
         mov %o1, %o0

uspace/lib/libc/arch/sparc64/src/stacktrace.S

@@ -51 +51 @@
 
 frame_pointer_validate:
-        # Just return the frame address.
-        retl
-        nop
+        #
+        # Fall through - we detect the last frame in the trace by zero %i7.
+        #
 
 return_address_get:

uspace/lib/libc/arch/sparc64/src/thread_entry.s

@@ -35 +35 @@
 #
 __thread_entry:
+        #
+        # Stop stack traces in this function.
+        #
+        clr %i7
+
         sethi %hi(_gp), %l7
         call __thread_main              ! %o0 contains address of uarg