| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* |
| 3 | * linux/arch/arm/vfp/entry.S |
| 4 | * |
| 5 | * Copyright (C) 2004 ARM Limited. |
| 6 | * Written by Deep Blue Solutions Limited. |
| 7 | */ |
| 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> |
| 14 | |
| 15 | @ VFP entry point. |
| 16 | @ |
| 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 |
| 22 | @ IRQs enabled. |
| 23 | @ |
| 24 | ENTRY(do_vfp) |
| 25 | inc_preempt_count r10, r4 |
| 26 | ldr r4, .LCvfp |
| 27 | ldr r11, [r10, #TI_CPU] @ CPU number |
| 28 | add r10, r10, #TI_VFPSTATE @ r10 = workspace |
| 29 | ldr pc, [r4] @ call VFP entry point |
| 30 | ENDPROC(do_vfp) |
| 31 | |
| 32 | ENTRY(vfp_null_entry) |
| 33 | dec_preempt_count_ti r10, r4 |
| 34 | ret lr |
| 35 | ENDPROC(vfp_null_entry) |
| 36 | |
| 37 | .align 2 |
| 38 | .LCvfp: |
| 39 | .word vfp_vector |