summaryrefslogtreecommitdiff
path: root/arch/arm/vfp/entry.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/vfp/entry.S')
-rw-r--r--arch/arm/vfp/entry.S59
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S
new file mode 100644
index 000000000..2e78760f3
--- /dev/null
+++ b/arch/arm/vfp/entry.S
@@ -0,0 +1,59 @@
+/*
+ * 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.
+ */
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/thread_info.h>
+#include <asm/vfpmacros.h>
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+
+@ VFP entry point.
+@
+@ r0 = instruction opcode (32-bit ARM or two 16-bit Thumb)
+@ r2 = PC value to resume execution after successful emulation
+@ r9 = normal "successful" return address
+@ r10 = this threads thread_info structure
+@ lr = unrecognised instruction return address
+@ IRQs enabled.
+@
+ENTRY(do_vfp)
+ inc_preempt_count r10, r4
+ ldr r4, .LCvfp
+ ldr r11, [r10, #TI_CPU] @ CPU number
+ add r10, r10, #TI_VFPSTATE @ r10 = workspace
+ ldr pc, [r4] @ call VFP entry point
+ENDPROC(do_vfp)
+
+ENTRY(vfp_null_entry)
+ dec_preempt_count_ti r10, r4
+ ret lr
+ENDPROC(vfp_null_entry)
+
+ .align 2
+.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
+ENTRY(vfp_testing_entry)
+ dec_preempt_count_ti r10, r4
+ ldr r0, VFP_arch_address
+ str r0, [r0] @ set to non-zero value
+ ret r9 @ we have handled the fault
+ENDPROC(vfp_testing_entry)
+
+ .align 2
+VFP_arch_address:
+ .word VFP_arch
+
+ __FINIT