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1da177e4 LT |
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 | |
24 | do_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 | |
37 | vfp_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 | ||
42 | VFP_arch_address: | |
43 | .word VFP_arch | |
44 | ||
45 | __FINIT |