Diffstat (limited to 'arch/arm/vfp/entry.S')
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S
new file mode 100644
@@ -0,0 +1,45 @@
+ * linux/arch/arm/vfp/entry.S
+ * Copyright (C) 2004 ARM Limited.
+ * Written by Deep Blue Solutions Limited.
+ * 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.
+ * Basic entry code, called from the kernel's undefined instruction trap.
+ * r0 = faulted instruction
+ * r5 = faulted PC+4
+ * r9 = successful return
+ * r10 = thread_info structure
+ * lr = failure return
+ .globl do_vfp
+ ldr r4, .LCvfp
+ add r10, r10, #TI_VFPSTATE @ r10 = workspace
+ ldr pc, [r4] @ call VFP entry point
+ .word vfp_vector
+@ This code is called if the VFP does not exist. It needs to flag the
+@ failure to the VFP initialisation code.
+ .globl vfp_testing_entry
+ ldr r0, VFP_arch_address
+ str r5, [r0] @ known non-zero value
+ mov pc, r9 @ we have handled the fault
+ .word VFP_arch