48 lines
1.1 KiB
ArmAsm
48 lines
1.1 KiB
ArmAsm
/*
|
|
* 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
|
|
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
|