60 lines
1.4 KiB
ArmAsm
60 lines
1.4 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.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/vfpmacros.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
@ VFP entry point.
|
|
@
|
|
@ r0 = instruction opcode (32-bit ARM or two 16-bit Thumb)
|
|
@ r2 = PC value to resume execution after successful emulation
|
|
@ r9 = normal "successful" return address
|
|
@ r10 = this threads thread_info structure
|
|
@ lr = unrecognised instruction return address
|
|
@ IRQs enabled.
|
|
@
|
|
ENTRY(do_vfp)
|
|
inc_preempt_count r10, r4
|
|
ldr r4, .LCvfp
|
|
ldr r11, [r10, #TI_CPU] @ CPU number
|
|
add r10, r10, #TI_VFPSTATE @ r10 = workspace
|
|
ldr pc, [r4] @ call VFP entry point
|
|
ENDPROC(do_vfp)
|
|
|
|
ENTRY(vfp_null_entry)
|
|
dec_preempt_count_ti r10, r4
|
|
ret lr
|
|
ENDPROC(vfp_null_entry)
|
|
|
|
.align 2
|
|
.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
|
|
ENTRY(vfp_testing_entry)
|
|
dec_preempt_count_ti r10, r4
|
|
ldr r0, VFP_arch_address
|
|
str r0, [r0] @ set to non-zero value
|
|
ret r9 @ we have handled the fault
|
|
ENDPROC(vfp_testing_entry)
|
|
|
|
.align 2
|
|
VFP_arch_address:
|
|
.word VFP_arch
|
|
|
|
__FINIT
|