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11/17/2022 06:42:16 AM
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Kbuild
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asm-offsets.h
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asm-uaccess.h
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uaccess.h
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Editing: asm-uaccess.h
Close
/* * include/asm-xtensa/uaccess.h * * User space memory access functions * * These routines provide basic accessing functions to the user memory * space for the kernel. This header file provides functions such as: * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2001 - 2005 Tensilica Inc. */ #ifndef _XTENSA_ASM_UACCESS_H #define _XTENSA_ASM_UACCESS_H #include <linux/errno.h> #include <asm/types.h> #include <asm/current.h> #include <asm/asm-offsets.h> #include <asm/processor.h> /* * These assembly macros mirror the C macros in asm/uaccess.h. They * should always have identical functionality. See * arch/xtensa/kernel/sys.S for usage. */ #define KERNEL_DS 0 #define USER_DS 1 #define get_ds (KERNEL_DS) /* * get_fs reads current->thread.current_ds into a register. * On Entry: * <ad> anything * <sp> stack * On Exit: * <ad> contains current->thread.current_ds */ .macro get_fs ad, sp GET_CURRENT(\ad,\sp) #if THREAD_CURRENT_DS > 1020 addi \ad, \ad, TASK_THREAD l32i \ad, \ad, THREAD_CURRENT_DS - TASK_THREAD #else l32i \ad, \ad, THREAD_CURRENT_DS #endif .endm /* * set_fs sets current->thread.current_ds to some value. * On Entry: * <at> anything (temp register) * <av> value to write * <sp> stack * On Exit: * <at> destroyed (actually, current) * <av> preserved, value to write */ .macro set_fs at, av, sp GET_CURRENT(\at,\sp) s32i \av, \at, THREAD_CURRENT_DS .endm /* * kernel_ok determines whether we should bypass addr/size checking. * See the equivalent C-macro version below for clarity. * On success, kernel_ok branches to a label indicated by parameter * <success>. This implies that the macro falls through to the next * insruction on an error. * * Note that while this macro can be used independently, we designed * in for optimal use in the access_ok macro below (i.e., we fall * through on error). * * On Entry: * <at> anything (temp register) * <success> label to branch to on success; implies * fall-through macro on error * <sp> stack pointer * On Exit: * <at> destroyed (actually, current->thread.current_ds) */ #if ((KERNEL_DS != 0) || (USER_DS == 0)) # error Assembly macro kernel_ok fails #endif .macro kernel_ok at, sp, success get_fs \at, \sp beqz \at, \success .endm /* * user_ok determines whether the access to user-space memory is allowed. * See the equivalent C-macro version below for clarity. * * On error, user_ok branches to a label indicated by parameter * <error>. This implies that the macro falls through to the next * instruction on success. * * Note that while this macro can be used independently, we designed * in for optimal use in the access_ok macro below (i.e., we fall * through on success). * * On Entry: * <aa> register containing memory address * <as> register containing memory size * <at> temp register * <error> label to branch to on error; implies fall-through * macro on success * On Exit: * <aa> preserved * <as> preserved * <at> destroyed (actually, (TASK_SIZE + 1 - size)) */ .macro user_ok aa, as, at, error movi \at, __XTENSA_UL_CONST(TASK_SIZE) bgeu \as, \at, \error sub \at, \at, \as bgeu \aa, \at, \error .endm /* * access_ok determines whether a memory access is allowed. See the * equivalent C-macro version below for clarity. * * On error, access_ok branches to a label indicated by parameter * <error>. This implies that the macro falls through to the next * instruction on success. * * Note that we assume success is the common case, and we optimize the * branch fall-through case on success. * * On Entry: * <aa> register containing memory address * <as> register containing memory size * <at> temp register * <sp> * <error> label to branch to on error; implies fall-through * macro on success * On Exit: * <aa> preserved * <as> preserved * <at> destroyed */ .macro access_ok aa, as, at, sp, error kernel_ok \at, \sp, .Laccess_ok_\@ user_ok \aa, \as, \at, \error .Laccess_ok_\@: .endm #endif /* _XTENSA_ASM_UACCESS_H */