2 * linux/arch/arm/vfp/entry.S
4 * Copyright (C) 2004 ARM Limited.
5 * Written by Deep Blue Solutions Limited.
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.
11 #include <asm/thread_info.h>
12 #include <asm/vfpmacros.h>
13 #include "../kernel/entry-header.S"
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
25 #ifdef CONFIG_PREEMPT_COUNT
26 ldr r4, [r10, #TI_PREEMPT] @ get preempt count
27 add r11, r4, #1 @ increment it
28 str r11, [r10, #TI_PREEMPT]
32 ldr r11, [r10, #TI_CPU] @ CPU number
33 add r10, r10, #TI_VFPSTATE @ r10 = workspace
34 ldr pc, [r4] @ call VFP entry point
38 #ifdef CONFIG_PREEMPT_COUNT
40 ldr r4, [r10, #TI_PREEMPT] @ get preempt count
41 sub r11, r4, #1 @ decrement it
42 str r11, [r10, #TI_PREEMPT]
45 ENDPROC(vfp_null_entry)
51 @ This code is called if the VFP does not exist. It needs to flag the
52 @ failure to the VFP initialisation code.
55 ENTRY(vfp_testing_entry)
56 #ifdef CONFIG_PREEMPT_COUNT
58 ldr r4, [r10, #TI_PREEMPT] @ get preempt count
59 sub r11, r4, #1 @ decrement it
60 str r11, [r10, #TI_PREEMPT]
62 ldr r0, VFP_arch_address
63 str r0, [r0] @ set to non-zero value
64 mov pc, r9 @ we have handled the fault
65 ENDPROC(vfp_testing_entry)