18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-only */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Copyright (C) 2012 ARM Ltd. 48c2ecf20Sopenharmony_ci */ 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci#include <linux/linkage.h> 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ci#include <asm/asm-uaccess.h> 98c2ecf20Sopenharmony_ci#include <asm/assembler.h> 108c2ecf20Sopenharmony_ci#include <asm/cache.h> 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ci/* 138c2ecf20Sopenharmony_ci * Copy to user space from a kernel buffer (alignment handled by the hardware) 148c2ecf20Sopenharmony_ci * 158c2ecf20Sopenharmony_ci * Parameters: 168c2ecf20Sopenharmony_ci * x0 - to 178c2ecf20Sopenharmony_ci * x1 - from 188c2ecf20Sopenharmony_ci * x2 - n 198c2ecf20Sopenharmony_ci * Returns: 208c2ecf20Sopenharmony_ci * x0 - bytes not copied 218c2ecf20Sopenharmony_ci */ 228c2ecf20Sopenharmony_ci .macro ldrb1 reg, ptr, val 238c2ecf20Sopenharmony_ci ldrb \reg, [\ptr], \val 248c2ecf20Sopenharmony_ci .endm 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ci .macro strb1 reg, ptr, val 278c2ecf20Sopenharmony_ci uao_user_alternative 9998f, strb, sttrb, \reg, \ptr, \val 288c2ecf20Sopenharmony_ci .endm 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ci .macro ldrh1 reg, ptr, val 318c2ecf20Sopenharmony_ci ldrh \reg, [\ptr], \val 328c2ecf20Sopenharmony_ci .endm 338c2ecf20Sopenharmony_ci 348c2ecf20Sopenharmony_ci .macro strh1 reg, ptr, val 358c2ecf20Sopenharmony_ci uao_user_alternative 9997f, strh, sttrh, \reg, \ptr, \val 368c2ecf20Sopenharmony_ci .endm 378c2ecf20Sopenharmony_ci 388c2ecf20Sopenharmony_ci .macro ldr1 reg, ptr, val 398c2ecf20Sopenharmony_ci ldr \reg, [\ptr], \val 408c2ecf20Sopenharmony_ci .endm 418c2ecf20Sopenharmony_ci 428c2ecf20Sopenharmony_ci .macro str1 reg, ptr, val 438c2ecf20Sopenharmony_ci uao_user_alternative 9997f, str, sttr, \reg, \ptr, \val 448c2ecf20Sopenharmony_ci .endm 458c2ecf20Sopenharmony_ci 468c2ecf20Sopenharmony_ci .macro ldp1 reg1, reg2, ptr, val 478c2ecf20Sopenharmony_ci ldp \reg1, \reg2, [\ptr], \val 488c2ecf20Sopenharmony_ci .endm 498c2ecf20Sopenharmony_ci 508c2ecf20Sopenharmony_ci .macro stp1 reg1, reg2, ptr, val 518c2ecf20Sopenharmony_ci uao_stp 9997f, \reg1, \reg2, \ptr, \val 528c2ecf20Sopenharmony_ci .endm 538c2ecf20Sopenharmony_ci 548c2ecf20Sopenharmony_ciend .req x5 558c2ecf20Sopenharmony_cisrcin .req x15 568c2ecf20Sopenharmony_ciSYM_FUNC_START(__arch_copy_to_user) 578c2ecf20Sopenharmony_ci add end, x0, x2 588c2ecf20Sopenharmony_ci mov srcin, x1 598c2ecf20Sopenharmony_ci#include "copy_template.S" 608c2ecf20Sopenharmony_ci mov x0, #0 618c2ecf20Sopenharmony_ci ret 628c2ecf20Sopenharmony_ciSYM_FUNC_END(__arch_copy_to_user) 638c2ecf20Sopenharmony_ciEXPORT_SYMBOL(__arch_copy_to_user) 648c2ecf20Sopenharmony_ci 658c2ecf20Sopenharmony_ci .section .fixup,"ax" 668c2ecf20Sopenharmony_ci .align 2 678c2ecf20Sopenharmony_ci9997: cmp dst, dstin 688c2ecf20Sopenharmony_ci b.ne 9998f 698c2ecf20Sopenharmony_ci // Before being absolutely sure we couldn't copy anything, try harder 708c2ecf20Sopenharmony_ci ldrb tmp1w, [srcin] 718c2ecf20Sopenharmony_ciUSER(9998f, sttrb tmp1w, [dst]) 728c2ecf20Sopenharmony_ci add dst, dst, #1 738c2ecf20Sopenharmony_ci9998: sub x0, end, dst // bytes not copied 748c2ecf20Sopenharmony_ci ret 758c2ecf20Sopenharmony_ci .previous 76