projects / deliverable / 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 | */ | |
| f2255be8 | 18 | #include <asm/thread_info.h> |
| 1da177e4 | 19 | #include <asm/vfpmacros.h> |
| f2255be8 | 20 | #include "../kernel/entry-header.S" |
| 1da177e4 | 21 | |
| 93ed3970 | 22 | ENTRY(do_vfp) |
| f2255be8 GD |
23 | #ifdef CONFIG_PREEMPT |
| 24 | ldr r4, [r10, #TI_PREEMPT] @ get preempt count | |
| 25 | add r11, r4, #1 @ increment it | |
| 26 | str r11, [r10, #TI_PREEMPT] | |
| 27 | #endif | |
| 5d25ac03 | 28 | enable_irq |
| 1da177e4 | 29 | ldr r4, .LCvfp |
| c6428464 | 30 | ldr r11, [r10, #TI_CPU] @ CPU number |
| 1da177e4 LT |
31 | add r10, r10, #TI_VFPSTATE @ r10 = workspace |
| 32 | ldr pc, [r4] @ call VFP entry point | |
| 93ed3970 | 33 | ENDPROC(do_vfp) |
| 1da177e4 | 34 | |
| 5d4cae5f | 35 | ENTRY(vfp_null_entry) |
| f2255be8 GD |
36 | #ifdef CONFIG_PREEMPT |
| 37 | get_thread_info r10 | |
| 38 | ldr r4, [r10, #TI_PREEMPT] @ get preempt count | |
| 39 | sub r11, r4, #1 @ decrement it | |
| 40 | str r11, [r10, #TI_PREEMPT] | |
| 41 | #endif | |
| 5d4cae5f RK |
42 | mov pc, lr |
| 43 | ENDPROC(vfp_null_entry) | |
| 44 | ||
| 1da177e4 LT |
45 | .LCvfp: |
| 46 | .word vfp_vector | |
| 47 | ||
| 48 | @ This code is called if the VFP does not exist. It needs to flag the | |
| 49 | @ failure to the VFP initialisation code. | |
| 50 | ||
| 51 | __INIT | |
| 93ed3970 | 52 | ENTRY(vfp_testing_entry) |
| f2255be8 GD |
53 | #ifdef CONFIG_PREEMPT |
| 54 | get_thread_info r10 | |
| 55 | ldr r4, [r10, #TI_PREEMPT] @ get preempt count | |
| 56 | sub r11, r4, #1 @ decrement it | |
| 57 | str r11, [r10, #TI_PREEMPT] | |
| 58 | #endif | |
| 1da177e4 LT |
59 | ldr r0, VFP_arch_address |
| 60 | str r5, [r0] @ known non-zero value | |
| 61 | mov pc, r9 @ we have handled the fault | |
| 93ed3970 | 62 | ENDPROC(vfp_testing_entry) |
| 1da177e4 LT |
63 | |
| 64 | VFP_arch_address: | |
| 65 | .word VFP_arch | |
| 66 | ||
| 67 | __FINIT |