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Diffstat (limited to 'arch/arm/vfp/entry.S')
| -rw-r--r-- | arch/arm/vfp/entry.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S new file mode 100644 index 00000000000..e73c8deca59 --- /dev/null +++ b/arch/arm/vfp/entry.S @@ -0,0 +1,45 @@ +/* + * 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. + * + * Basic entry code, called from the kernel's undefined instruction trap. + * r0 = faulted instruction + * r5 = faulted PC+4 + * r9 = successful return + * r10 = thread_info structure + * lr = failure return + */ +#include <linux/linkage.h> +#include <linux/init.h> +#include <asm/constants.h> +#include <asm/vfpmacros.h> + + .globl do_vfp +do_vfp: + ldr r4, .LCvfp + add r10, r10, #TI_VFPSTATE @ r10 = workspace + ldr pc, [r4] @ call VFP entry point + +.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 + .globl vfp_testing_entry +vfp_testing_entry: + ldr r0, VFP_arch_address + str r5, [r0] @ known non-zero value + mov pc, r9 @ we have handled the fault + +VFP_arch_address: + .word VFP_arch + + __FINIT |