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/arch/arm/vfp/entry.S

https://bitbucket.org/evzijst/gittest
Assembly | 45 lines | 45 code | 0 blank | 0 comment | 0 complexity | 659e2044778f4c69585c610df1842fc2 MD5 | raw file
 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 * Basic entry code, called from the kernel's undefined instruction trap.
12 *  r0  = faulted instruction
13 *  r5  = faulted PC+4
14 *  r9  = successful return
15 *  r10 = thread_info structure
16 *  lr  = failure return
17 */
18#include <linux/linkage.h>
19#include <linux/init.h>
20#include <asm/constants.h>
21#include <asm/vfpmacros.h>
22
23	.globl	do_vfp
24do_vfp:
25 	ldr	r4, .LCvfp
26	add	r10, r10, #TI_VFPSTATE	@ r10 = workspace
27	ldr	pc, [r4]		@ call VFP entry point
28
29.LCvfp:
30	.word	vfp_vector
31
32@ This code is called if the VFP does not exist. It needs to flag the
33@ failure to the VFP initialisation code.
34
35	__INIT
36	.globl	vfp_testing_entry
37vfp_testing_entry:
38	ldr	r0, VFP_arch_address
39	str	r5, [r0]		@ known non-zero value
40	mov	pc, r9			@ we have handled the fault
41
42VFP_arch_address:
43	.word	VFP_arch
44
45	__FINIT