MN10300: Fix ret_from_kernel_thread

ret_from_kernel_thread needs to set A2 to the thread_info pointer before jumping to syscall_exit. Without this, we never correctly start userspace. This was caused by the rejuggling of the fork/exec paths in commit ddf23e8 ("mn10300: switch to saner kernel_execve() semantics") Reported-by: Ken Cox <[email protected]> Signed-off-by: David Howells <[email protected]> Acked-by: Ken Cox <[email protected]> Acked-by: Al Viro <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
xsls · May 30, 2013 · 1e00227 · 1e00227
1 parent e4aa937
commit 1e00227
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
@@ -60,6 +60,7 @@ ENTRY(ret_from_kernel_thread)
 	mov	(REG_D0,fp),d0
 	mov	(REG_A0,fp),a0
 	calls	(a0)
+	GET_THREAD_INFO a2		# A2 must be set on return from sys_exit()
 	clr	d0
 	mov	d0,(REG_D0,fp)
 	jmp	syscall_exit