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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/vfp/entry.S
downloadlinux-stericsson-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+/*
+ * 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
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/constants.h>
+#include <asm/vfpmacros.h>
+
+ .globl do_vfp
+do_vfp:
+ ldr r4, .LCvfp
+ add r10, r10, #TI_VFPSTATE @ r10 = workspace
+ ldr pc, [r4] @ call VFP entry point
+
+.LCvfp:
+ .word vfp_vector
+
+@ This code is called if the VFP does not exist. It needs to flag the
+@ failure to the VFP initialisation code.
+
+ __INIT
+ .globl vfp_testing_entry
+vfp_testing_entry:
+ ldr r0, VFP_arch_address
+ str r5, [r0] @ known non-zero value
+ mov pc, r9 @ we have handled the fault
+
+VFP_arch_address:
+ .word VFP_arch
+
+ __FINIT