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MN10300: Fix ret_from_kernel_thread

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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
ddf23e87a8 ("mn10300: switch to saner kernel_execve() semantics")

Reported-by: Ken Cox <jkc@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Ken Cox <jkc@redhat.com>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2013-05-28 20:21:02 +01:00 committed by Linus Torvalds
parent e4aa937ec7
commit 1e00227d4e
1 changed files with 1 additions and 0 deletions
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1
arch/mn10300/kernel/entry.S
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@ -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