projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| e6ae744d | 20 | #include <asm/asm-offsets.h> |
| 9c42954d | 21 | #include <asm/assembler.h> |
| 1da177e4 LT |
22 | #include <asm/vfpmacros.h> |
| 23 | ||
| 24 | .globl do_vfp | |
| 25 | do_vfp: | |
| 5d25ac03 | 26 | enable_irq |
| 1da177e4 | 27 | ldr r4, .LCvfp |
| c6428464 | 28 | ldr r11, [r10, #TI_CPU] @ CPU number |
| 1da177e4 LT |
29 | add r10, r10, #TI_VFPSTATE @ r10 = workspace |
| 30 | ldr pc, [r4] @ call VFP entry point | |
| 31 | ||
| 32 | .LCvfp: | |
| 33 | .word vfp_vector | |
| 34 | ||
| 35 | @ This code is called if the VFP does not exist. It needs to flag the | |
| 36 | @ failure to the VFP initialisation code. | |
| 37 | ||
| 38 | __INIT | |
| 39 | .globl vfp_testing_entry | |
| 40 | vfp_testing_entry: | |
| 41 | ldr r0, VFP_arch_address | |
| 42 | str r5, [r0] @ known non-zero value | |
| 43 | mov pc, r9 @ we have handled the fault | |
| 44 | ||
| 45 | VFP_arch_address: | |
| 46 | .word VFP_arch | |
| 47 | ||
| 48 | __FINIT |