18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-only */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Copy from user space to user space 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * Copyright (C) 2012 ARM Ltd. 68c2ecf20Sopenharmony_ci */ 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ci#include <linux/linkage.h> 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci#include <asm/asm-uaccess.h> 118c2ecf20Sopenharmony_ci#include <asm/assembler.h> 128c2ecf20Sopenharmony_ci#include <asm/cache.h> 138c2ecf20Sopenharmony_ci 148c2ecf20Sopenharmony_ci/* 158c2ecf20Sopenharmony_ci * Copy from user space to user space (alignment handled by the hardware) 168c2ecf20Sopenharmony_ci * 178c2ecf20Sopenharmony_ci * Parameters: 188c2ecf20Sopenharmony_ci * x0 - to 198c2ecf20Sopenharmony_ci * x1 - from 208c2ecf20Sopenharmony_ci * x2 - n 218c2ecf20Sopenharmony_ci * Returns: 228c2ecf20Sopenharmony_ci * x0 - bytes not copied 238c2ecf20Sopenharmony_ci */ 248c2ecf20Sopenharmony_ci .macro ldrb1 reg, ptr, val 258c2ecf20Sopenharmony_ci uao_user_alternative 9998f, ldrb, ldtrb, \reg, \ptr, \val 268c2ecf20Sopenharmony_ci .endm 278c2ecf20Sopenharmony_ci 288c2ecf20Sopenharmony_ci .macro strb1 reg, ptr, val 298c2ecf20Sopenharmony_ci uao_user_alternative 9998f, strb, sttrb, \reg, \ptr, \val 308c2ecf20Sopenharmony_ci .endm 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_ci .macro ldrh1 reg, ptr, val 338c2ecf20Sopenharmony_ci uao_user_alternative 9997f, ldrh, ldtrh, \reg, \ptr, \val 348c2ecf20Sopenharmony_ci .endm 358c2ecf20Sopenharmony_ci 368c2ecf20Sopenharmony_ci .macro strh1 reg, ptr, val 378c2ecf20Sopenharmony_ci uao_user_alternative 9997f, strh, sttrh, \reg, \ptr, \val 388c2ecf20Sopenharmony_ci .endm 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_ci .macro ldr1 reg, ptr, val 418c2ecf20Sopenharmony_ci uao_user_alternative 9997f, ldr, ldtr, \reg, \ptr, \val 428c2ecf20Sopenharmony_ci .endm 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ci .macro str1 reg, ptr, val 458c2ecf20Sopenharmony_ci uao_user_alternative 9997f, str, sttr, \reg, \ptr, \val 468c2ecf20Sopenharmony_ci .endm 478c2ecf20Sopenharmony_ci 488c2ecf20Sopenharmony_ci .macro ldp1 reg1, reg2, ptr, val 498c2ecf20Sopenharmony_ci uao_ldp 9997f, \reg1, \reg2, \ptr, \val 508c2ecf20Sopenharmony_ci .endm 518c2ecf20Sopenharmony_ci 528c2ecf20Sopenharmony_ci .macro stp1 reg1, reg2, ptr, val 538c2ecf20Sopenharmony_ci uao_stp 9997f, \reg1, \reg2, \ptr, \val 548c2ecf20Sopenharmony_ci .endm 558c2ecf20Sopenharmony_ci 568c2ecf20Sopenharmony_ciend .req x5 578c2ecf20Sopenharmony_cisrcin .req x15 588c2ecf20Sopenharmony_ciSYM_FUNC_START(__arch_copy_in_user) 598c2ecf20Sopenharmony_ci add end, x0, x2 608c2ecf20Sopenharmony_ci mov srcin, x1 618c2ecf20Sopenharmony_ci#include "copy_template.S" 628c2ecf20Sopenharmony_ci mov x0, #0 638c2ecf20Sopenharmony_ci ret 648c2ecf20Sopenharmony_ciSYM_FUNC_END(__arch_copy_in_user) 658c2ecf20Sopenharmony_ciEXPORT_SYMBOL(__arch_copy_in_user) 668c2ecf20Sopenharmony_ci 678c2ecf20Sopenharmony_ci .section .fixup,"ax" 688c2ecf20Sopenharmony_ci .align 2 698c2ecf20Sopenharmony_ci9997: cmp dst, dstin 708c2ecf20Sopenharmony_ci b.ne 9998f 718c2ecf20Sopenharmony_ci // Before being absolutely sure we couldn't copy anything, try harder 728c2ecf20Sopenharmony_ciUSER(9998f, ldtrb tmp1w, [srcin]) 738c2ecf20Sopenharmony_ciUSER(9998f, sttrb tmp1w, [dst]) 748c2ecf20Sopenharmony_ci add dst, dst, #1 758c2ecf20Sopenharmony_ci9998: sub x0, end, dst // bytes not copied 768c2ecf20Sopenharmony_ci ret 778c2ecf20Sopenharmony_ci .previous 78