/* * 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 <asm/thread_info.h> #include <asm/vfpmacros.h> #include "../kernel/entry-header.S" @ 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 disabled. @ ENTRY(do_vfp) #ifdef CONFIG_PREEMPT ldr r4, [r10, #TI_PREEMPT] @ get preempt count add r11, r4, #1 @ increment it str r11, [r10, #TI_PREEMPT] #endif enable_irq 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) #ifdef CONFIG_PREEMPT get_thread_info r10 ldr r4, [r10, #TI_PREEMPT] @ get preempt count sub r11, r4, #1 @ decrement it str r11, [r10, #TI_PREEMPT] #endif mov pc, 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) #ifdef CONFIG_PREEMPT get_thread_info r10 ldr r4, [r10, #TI_PREEMPT] @ get preempt count sub r11, r4, #1 @ decrement it str r11, [r10, #TI_PREEMPT] #endif ldr r0, VFP_arch_address str r5, [r0] @ known non-zero value mov pc, r9 @ we have handled the fault ENDPROC(vfp_testing_entry) .align 2 VFP_arch_address: .word VFP_arch __FINIT