1/*
 2 *  linux/arch/arm/vfp/entry.S
 3 *
 4 *  Copyright (C) 2004 ARM Limited.
 5 *  Written by Deep Blue Solutions Limited.
 6 *
 7 * This program is free software; you can redistribute it and/or modify
 8 * it under the terms of the GNU General Public License version 2 as
 9 * published by the Free Software Foundation.
10 */
11#include <linux/init.h>
12#include <linux/linkage.h>
13#include <asm/thread_info.h>
14#include <asm/vfpmacros.h>
15#include <asm/assembler.h>
16#include <asm/asm-offsets.h>
17
18@ VFP entry point.
19@
20@  r0  = instruction opcode (32-bit ARM or two 16-bit Thumb)
21@  r2  = PC value to resume execution after successful emulation
22@  r9  = normal "successful" return address
23@  r10 = this threads thread_info structure
24@  lr  = unrecognised instruction return address
25@  IRQs enabled.
26@
27ENTRY(do_vfp)
28	inc_preempt_count r10, r4
29 	ldr	r4, .LCvfp
30	ldr	r11, [r10, #TI_CPU]	@ CPU number
31	add	r10, r10, #TI_VFPSTATE	@ r10 = workspace
32	ldr	pc, [r4]		@ call VFP entry point
33ENDPROC(do_vfp)
34
35ENTRY(vfp_null_entry)
36	dec_preempt_count_ti r10, r4
37	ret	lr
38ENDPROC(vfp_null_entry)
39
40	.align	2
41.LCvfp:
42	.word	vfp_vector
43
44@ This code is called if the VFP does not exist. It needs to flag the
45@ failure to the VFP initialisation code.
46
47	__INIT
48ENTRY(vfp_testing_entry)
49	dec_preempt_count_ti r10, r4
50	ldr	r0, VFP_arch_address
51	str	r0, [r0]		@ set to non-zero value
52	ret	r9			@ we have handled the fault
53ENDPROC(vfp_testing_entry)
54
55	.align	2
56VFP_arch_address:
57	.word	VFP_arch
58
59	__FINIT