This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / frv / kernel / kernel_thread.S

diff --git a/arch/frv/kernel/kernel_thread.S b/arch/frv/kernel/kernel_thread.S
new file mode 100644 (file)
index 0000000..4531c83
--- /dev/null
+++ b/arch/frv/kernel/kernel_thread.S
@@ -0,0 +1,77 @@
+/* kernel_thread.S: kernel thread creation
+ *
+ * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/linkage.h>
+#include <asm/unistd.h>
+
+#define CLONE_VM       0x00000100      /* set if VM shared between processes */
+#define        KERN_ERR        "<3>"
+
+       .section .rodata
+kernel_thread_emsg:
+       .asciz  KERN_ERR "failed to create kernel thread: error=%d\n"
+
+       .text
+       .balign         4
+
+###############################################################################
+#
+# Create a kernel thread
+#
+# int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+#
+###############################################################################
+       .globl          kernel_thread
+       .type           kernel_thread,@function
+kernel_thread:
+       or.p            gr8,gr0,gr4
+       or              gr9,gr0,gr5
+
+       # start by forking the current process, but with shared VM
+       setlos.p        #__NR_clone,gr7         ; syscall number
+       ori             gr10,#CLONE_VM,gr8      ; first syscall arg     [clone_flags]
+       sethi.p         #0xe4e4,gr9             ; second syscall arg    [newsp]
+       setlo           #0xe4e4,gr9
+       setlos.p        #0,gr10                 ; third syscall arg     [parent_tidptr]
+       setlos          #0,gr11                 ; fourth syscall arg    [child_tidptr]
+       tira            gr0,#0
+       setlos.p        #4095,gr7
+       andcc           gr8,gr8,gr0,icc0
+       addcc.p         gr8,gr7,gr0,icc1
+       bnelr           icc0,#2
+       bc              icc1,#0,kernel_thread_error
+
+       # now invoke the work function
+       or              gr5,gr0,gr8
+       calll           @(gr4,gr0)
+
+       # and finally exit the thread
+       setlos          #__NR_exit,gr7          ; syscall number
+       tira            gr0,#0
+
+kernel_thread_error:
+       subi            sp,#8,sp
+       movsg           lr,gr4
+       sti             gr8,@(sp,#0)
+       sti.p           gr4,@(sp,#4)
+
+       or              gr8,gr0,gr9
+       sethi.p         %hi(kernel_thread_emsg),gr8
+       setlo           %lo(kernel_thread_emsg),gr8
+
+       call            printk
+
+       ldi             @(sp,#4),gr4
+       ldi             @(sp,#0),gr8
+       subi            sp,#8,sp
+       jmpl            @(gr4,gr0)
+
+       .size           kernel_thread,.-kernel_thread