Diffstat (limited to 'arch/arm/lib/call_with_stack.S')
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm/lib/call_with_stack.S b/arch/arm/lib/call_with_stack.S
new file mode 100644
@@ -0,0 +1,44 @@
+ * arch/arm/lib/call_with_stack.S
+ * Copyright (C) 2011 ARM Ltd.
+ * Written by Will Deacon <firstname.lastname@example.org>
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * void call_with_stack(void (*fn)(void *), void *arg, void *sp)
+ * Change the stack to that pointed at by sp, then invoke fn(arg) with
+ * the new stack.
+ str sp, [r2, #-4]!
+ str lr, [r2, #-4]!
+ mov sp, r2
+ mov r2, r0
+ mov r0, r1
+ adr lr, BSYM(1f)
+ mov pc, r2
+1: ldr lr, [sp]
+ ldr sp, [sp, #4]
+ mov pc, lr