^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * include/asm-xtensa/uaccess.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * User space memory access functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * These routines provide basic accessing functions to the user memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * space for the kernel. This header file provides functions such as:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Copyright (C) 2001 - 2005 Tensilica Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #ifndef _XTENSA_ASM_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define _XTENSA_ASM_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/current.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/asm-offsets.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * These assembly macros mirror the C macros in asm/uaccess.h. They
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * should always have identical functionality. See
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * arch/xtensa/kernel/sys.S for usage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define KERNEL_DS 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define USER_DS 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * get_fs reads current->thread.current_ds into a register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * On Entry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * <ad> anything
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * <sp> stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * On Exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * <ad> contains current->thread.current_ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .macro get_fs ad, sp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) GET_CURRENT(\ad,\sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #if THREAD_CURRENT_DS > 1020
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) addi \ad, \ad, TASK_THREAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) l32i \ad, \ad, THREAD_CURRENT_DS - TASK_THREAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) l32i \ad, \ad, THREAD_CURRENT_DS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * set_fs sets current->thread.current_ds to some value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * On Entry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * <at> anything (temp register)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * <av> value to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * <sp> stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * On Exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * <at> destroyed (actually, current)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * <av> preserved, value to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .macro set_fs at, av, sp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) GET_CURRENT(\at,\sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) s32i \av, \at, THREAD_CURRENT_DS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) .endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * kernel_ok determines whether we should bypass addr/size checking.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * See the equivalent C-macro version below for clarity.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * On success, kernel_ok branches to a label indicated by parameter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * <success>. This implies that the macro falls through to the next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * insruction on an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Note that while this macro can be used independently, we designed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * in for optimal use in the access_ok macro below (i.e., we fall
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * through on error).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * On Entry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * <at> anything (temp register)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * <success> label to branch to on success; implies
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * fall-through macro on error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * <sp> stack pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * On Exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * <at> destroyed (actually, current->thread.current_ds)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #if ((KERNEL_DS != 0) || (USER_DS == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) # error Assembly macro kernel_ok fails
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) .macro kernel_ok at, sp, success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) get_fs \at, \sp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) beqz \at, \success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) .endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * user_ok determines whether the access to user-space memory is allowed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * See the equivalent C-macro version below for clarity.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * On error, user_ok branches to a label indicated by parameter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * <error>. This implies that the macro falls through to the next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * instruction on success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * Note that while this macro can be used independently, we designed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * in for optimal use in the access_ok macro below (i.e., we fall
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * through on success).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * On Entry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * <aa> register containing memory address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * <as> register containing memory size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * <at> temp register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * <error> label to branch to on error; implies fall-through
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * macro on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * On Exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * <aa> preserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * <as> preserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * <at> destroyed (actually, (TASK_SIZE + 1 - size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) .macro user_ok aa, as, at, error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) movi \at, __XTENSA_UL_CONST(TASK_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) bgeu \as, \at, \error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) sub \at, \at, \as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) bgeu \aa, \at, \error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) .endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * access_ok determines whether a memory access is allowed. See the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * equivalent C-macro version below for clarity.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * On error, access_ok branches to a label indicated by parameter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * <error>. This implies that the macro falls through to the next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * instruction on success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * Note that we assume success is the common case, and we optimize the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * branch fall-through case on success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * On Entry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * <aa> register containing memory address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * <as> register containing memory size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * <at> temp register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * <sp>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * <error> label to branch to on error; implies fall-through
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * macro on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * On Exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * <aa> preserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * <as> preserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * <at> destroyed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) .macro access_ok aa, as, at, sp, error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) kernel_ok \at, \sp, .Laccess_ok_\@
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) user_ok \aa, \as, \at, \error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) .Laccess_ok_\@:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) .endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) #endif /* _XTENSA_ASM_UACCESS_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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