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. | |
| 1da177e4 | 10 | */ |
| 39ad04cc CM |
11 | #include <linux/init.h> |
| 12 | #include <linux/linkage.h> | |
| f2255be8 | 13 | #include <asm/thread_info.h> |
| 1da177e4 | 14 | #include <asm/vfpmacros.h> |
| 39ad04cc CM |
15 | #include <asm/assembler.h> |
| 16 | #include <asm/asm-offsets.h> | |
| 1da177e4 | 17 | |
| 15ac49b6 RK |
18 | @ VFP entry point. |
| 19 | @ | |
| 20 | @ r0 = instruction opcode (32-bit ARM or two 16-bit Thumb) | |
| 21 | @ r2 = PC value to resume execution after successful emulation | |
| 22 | @ r9 = normal "successful" return address | |
| 23 | @ r10 = this threads thread_info structure | |
| 24 | @ lr = unrecognised instruction return address | |
| 1417a6b8 | 25 | @ IRQs enabled. |
| 15ac49b6 | 26 | @ |
| 93ed3970 | 27 | ENTRY(do_vfp) |
| 0b1f68e8 | 28 | inc_preempt_count r10, r4 |
| 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) |
| 0b1f68e8 | 36 | dec_preempt_count_ti r10, r4 |
| 6ebbf2ce | 37 | ret lr |
| 5d4cae5f RK |
38 | ENDPROC(vfp_null_entry) |
| 39 | ||
| 88987ef9 | 40 | .align 2 |
| 1da177e4 LT |
41 | .LCvfp: |
| 42 | .word vfp_vector | |
| 43 | ||
| 44 | @ This code is called if the VFP does not exist. It needs to flag the | |
| 45 | @ failure to the VFP initialisation code. | |
| 46 | ||
| 47 | __INIT | |
| 93ed3970 | 48 | ENTRY(vfp_testing_entry) |
| 0b1f68e8 | 49 | dec_preempt_count_ti r10, r4 |
| 1da177e4 | 50 | ldr r0, VFP_arch_address |
| f27d6e17 | 51 | str r0, [r0] @ set to non-zero value |
| 6ebbf2ce | 52 | ret r9 @ we have handled the fault |
| 93ed3970 | 53 | ENDPROC(vfp_testing_entry) |
| 1da177e4 | 54 | |
| 88987ef9 | 55 | .align 2 |
| 1da177e4 LT |
56 | VFP_arch_address: |
| 57 | .word VFP_arch | |
| 58 | ||
| 59 | __FINIT |