| /* | |
| * 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 |