blob: ca2a5ad19ea6a65ce9ee1c871a5b06fdcc9fab86 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*
* 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/asm-offsets.h>
#include <asm/assembler.h>
#include <asm/vfpmacros.h>
.globl do_vfp
do_vfp:
enable_irq
ldr r4, .LCvfp
ldr r11, [r10, #TI_CPU] @ CPU number
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
|
