| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |