| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/arm/vfp/entry.S |
| 3 | * |
| 4 | * Copyright (C) 2004 ARM Limited. |
| 5 | * Written by Deep Blue Solutions Limited. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/linkage.h> |
| 13 | #include <asm/thread_info.h> |
| 14 | #include <asm/vfpmacros.h> |
| 15 | #include <asm/assembler.h> |
| 16 | #include <asm/asm-offsets.h> |
| 17 | |
| 18 | @ VFP entry point. |
| 19 | @ |
| 20 | @ r0 = instruction opcode (32-bit ARM or two 16-bit Thumb) |
| 21 | @ r2 = PC value to resume execution after successful emulation |
| 22 | @ r9 = normal "successful" return address |
| 23 | @ r10 = this threads thread_info structure |
| 24 | @ lr = unrecognised instruction return address |
| 25 | @ IRQs enabled. |
| 26 | @ |
| 27 | ENTRY(do_vfp) |
| 28 | inc_preempt_count r10, r4 |
| 29 | ldr r4, .LCvfp |
| 30 | ldr r11, [r10, #TI_CPU] @ CPU number |
| 31 | add r10, r10, #TI_VFPSTATE @ r10 = workspace |
| 32 | ldr pc, [r4] @ call VFP entry point |
| 33 | ENDPROC(do_vfp) |
| 34 | |
| 35 | ENTRY(vfp_null_entry) |
| 36 | dec_preempt_count_ti r10, r4 |
| 37 | ret lr |
| 38 | ENDPROC(vfp_null_entry) |
| 39 | |
| 40 | .align 2 |
| 41 | .LCvfp: |
| 42 | .word vfp_vector |
| 43 | |
| 44 | @ This code is called if the VFP does not exist. It needs to flag the |
| 45 | @ failure to the VFP initialisation code. |
| 46 | |
| 47 | __INIT |
| 48 | ENTRY(vfp_testing_entry) |
| 49 | dec_preempt_count_ti r10, r4 |
| 50 | ldr r0, VFP_arch_address |
| 51 | str r0, [r0] @ set to non-zero value |
| 52 | ret r9 @ we have handled the fault |
| 53 | ENDPROC(vfp_testing_entry) |
| 54 | |
| 55 | .align 2 |
| 56 | VFP_arch_address: |
| 57 | .word VFP_arch |
| 58 | |
| 59 | __FINIT |