1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 *  linux/arch/arm/vfp/entry.S
 4 *
 5 *  Copyright (C) 2004 ARM Limited.
 6 *  Written by Deep Blue Solutions Limited.
 7 */
 8#include <linux/init.h>
 9#include <linux/linkage.h>
10#include <asm/thread_info.h>
11#include <asm/vfpmacros.h>
12#include <asm/assembler.h>
13#include <asm/asm-offsets.h>
14
15@ VFP entry point.
16@
17@  r0  = instruction opcode (32-bit ARM or two 16-bit Thumb)
18@  r2  = PC value to resume execution after successful emulation
19@  r9  = normal "successful" return address
20@  r10 = this threads thread_info structure
21@  lr  = unrecognised instruction return address
22@  IRQs enabled.
23@
24ENTRY(do_vfp)
25	inc_preempt_count r10, r4
26 	ldr	r4, .LCvfp
27	ldr	r11, [r10, #TI_CPU]	@ CPU number
28	add	r10, r10, #TI_VFPSTATE	@ r10 = workspace
29	ldr	pc, [r4]		@ call VFP entry point
30ENDPROC(do_vfp)
31
32ENTRY(vfp_null_entry)
33	dec_preempt_count_ti r10, r4
34	ret	lr
35ENDPROC(vfp_null_entry)
36
37	.align	2
38.LCvfp:
39	.word	vfp_vector
40
41@ This code is called if the VFP does not exist. It needs to flag the
42@ failure to the VFP initialisation code.
43
44	__INIT
45ENTRY(vfp_testing_entry)
46	dec_preempt_count_ti r10, r4
47	ldr	r0, VFP_arch_address
48	str	r0, [r0]		@ set to non-zero value
49	ret	r9			@ we have handled the fault
50ENDPROC(vfp_testing_entry)
51
52	.align	2
53VFP_arch_address:
54	.word	VFP_arch
55
56	__FINIT