| /* |
| * linux/arch/arm/vfp/entry.S |
| * |
| * Copyright (C) 2004 ARM Limited. |
| * Written by Deep Blue Solutions Limited. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/init.h> |
| #include <linux/linkage.h> |
| #include <asm/thread_info.h> |
| #include <asm/vfpmacros.h> |
| #include <asm/assembler.h> |
| #include <asm/asm-offsets.h> |
| |
| @ VFP entry point. |
| @ |
| @ r0 = instruction opcode (32-bit ARM or two 16-bit Thumb) |
| @ r2 = PC value to resume execution after successful emulation |
| @ r9 = normal "successful" return address |
| @ r10 = this threads thread_info structure |
| @ lr = unrecognised instruction return address |
| @ IRQs enabled. |
| @ |
| ENTRY(do_vfp) |
| inc_preempt_count r10, r4 |
| ldr r4, .LCvfp |
| ldr r11, [r10, #TI_CPU] @ CPU number |
| add r10, r10, #TI_VFPSTATE @ r10 = workspace |
| ldr pc, [r4] @ call VFP entry point |
| ENDPROC(do_vfp) |
| |
| ENTRY(vfp_null_entry) |
| dec_preempt_count_ti r10, r4 |
| ret lr |
| ENDPROC(vfp_null_entry) |
| |
| .align 2 |
| .LCvfp: |
| .word vfp_vector |
| |
| @ This code is called if the VFP does not exist. It needs to flag the |
| @ failure to the VFP initialisation code. |
| |
| __INIT |
| ENTRY(vfp_testing_entry) |
| dec_preempt_count_ti r10, r4 |
| ldr r0, VFP_arch_address |
| str r0, [r0] @ set to non-zero value |
| ret r9 @ we have handled the fault |
| ENDPROC(vfp_testing_entry) |
| |
| .align 2 |
| VFP_arch_address: |
| .word VFP_arch |
| |
| __FINIT |