1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/arch/arm/vfp/entry.S
5 * Copyright (C) 2004 ARM Limited.
6 * Written by Deep Blue Solutions Limited.
8 #include <linux/init.h>
9 #include <linux/linkage.h>
10 #include <asm/thread_info.h>
11 #include <asm/vfpmacros.h>
12 #include <asm/assembler.h>
13 #include <asm/asm-offsets.h>
17 @ r0 = instruction opcode (32-bit ARM or two 16-bit Thumb)
18 @ r2 = PC value to resume execution after successful emulation
19 @ r9 = normal "successful" return address
20 @ r10 = this threads thread_info structure
21 @ lr = unrecognised instruction return address
25 inc_preempt_count r10, r4
27 ldr r11, [r10, #TI_CPU] @ CPU number
28 add r10, r10, #TI_VFPSTATE @ r10 = workspace
29 ldr pc, [r4] @ call VFP entry point
33 dec_preempt_count_ti r10, r4
35 ENDPROC(vfp_null_entry)
41 @ This code is called if the VFP does not exist. It needs to flag the
42 @ failure to the VFP initialisation code.
45 ENTRY(vfp_testing_entry)
46 dec_preempt_count_ti r10, r4
47 ldr r0, VFP_arch_address
48 str r0, [r0] @ set to non-zero value
49 ret r9 @ we have handled the fault
50 ENDPROC(vfp_testing_entry)