diff options
Diffstat (limited to 'arch/arm/vfp/entry.S')
| -rw-r--r-- | arch/arm/vfp/entry.S | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S new file mode 100644 index 000000000..2e78760f3 --- /dev/null +++ b/arch/arm/vfp/entry.S @@ -0,0 +1,59 @@ +/* + * 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 |