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287 lines
7.8 KiB
287 lines
7.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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// Copyright (C) 2005-2017 Andes Technology Corporation |
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#ifndef _ASMANDES_UACCESS_H |
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#define _ASMANDES_UACCESS_H |
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/* |
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* User space memory access functions |
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*/ |
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#include <linux/sched.h> |
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#include <asm/errno.h> |
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#include <asm/memory.h> |
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#include <asm/types.h> |
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#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t" |
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/* |
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* The exception table consists of pairs of addresses: the first is the |
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* address of an instruction that is allowed to fault, and the second is |
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* the address at which the program should continue. No registers are |
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* modified, so it is entirely up to the continuation code to figure out |
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* what to do. |
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* |
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* All the routines below use bits of fixup code that are out of line |
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* with the main instruction path. This means when everything is well, |
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* we don't even have to jump over them. Further, they do not intrude |
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* on our cache or tlb entries. |
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*/ |
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struct exception_table_entry { |
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unsigned long insn, fixup; |
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}; |
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extern int fixup_exception(struct pt_regs *regs); |
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#define KERNEL_DS ((mm_segment_t) { ~0UL }) |
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#define USER_DS ((mm_segment_t) {TASK_SIZE - 1}) |
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#define get_fs() (current_thread_info()->addr_limit) |
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#define user_addr_max get_fs |
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static inline void set_fs(mm_segment_t fs) |
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{ |
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current_thread_info()->addr_limit = fs; |
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} |
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#define uaccess_kernel() (get_fs() == KERNEL_DS) |
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#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size)) |
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#define access_ok(addr, size) \ |
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__range_ok((unsigned long)addr, (unsigned long)size) |
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/* |
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* Single-value transfer routines. They automatically use the right |
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* size if we just have the right pointer type. Note that the functions |
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* which read from user space (*get_*) need to take care not to leak |
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* kernel data even if the calling code is buggy and fails to check |
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* the return value. This means zeroing out the destination variable |
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* or buffer on error. Normally this is done out of line by the |
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* fixup code, but there are a few places where it intrudes on the |
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* main code path. When we only write to user space, there is no |
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* problem. |
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* |
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* The "__xxx" versions of the user access functions do not verify the |
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* address space - it must have been done previously with a separate |
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* "access_ok()" call. |
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* |
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* The "xxx_error" versions set the third argument to EFAULT if an |
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* error occurs, and leave it unchanged on success. Note that these |
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* versions are void (ie, don't return a value as such). |
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*/ |
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#define get_user __get_user \ |
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#define __get_user(x, ptr) \ |
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({ \ |
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long __gu_err = 0; \ |
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__get_user_check((x), (ptr), __gu_err); \ |
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__gu_err; \ |
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}) |
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#define __get_user_error(x, ptr, err) \ |
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({ \ |
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__get_user_check((x), (ptr), (err)); \ |
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(void)0; \ |
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}) |
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#define __get_user_check(x, ptr, err) \ |
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({ \ |
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const __typeof__(*(ptr)) __user *__p = (ptr); \ |
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might_fault(); \ |
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if (access_ok(__p, sizeof(*__p))) { \ |
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__get_user_err((x), __p, (err)); \ |
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} else { \ |
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(x) = 0; (err) = -EFAULT; \ |
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} \ |
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}) |
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#define __get_user_err(x, ptr, err) \ |
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do { \ |
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unsigned long __gu_val; \ |
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__chk_user_ptr(ptr); \ |
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switch (sizeof(*(ptr))) { \ |
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case 1: \ |
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__get_user_asm("lbi", __gu_val, (ptr), (err)); \ |
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break; \ |
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case 2: \ |
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__get_user_asm("lhi", __gu_val, (ptr), (err)); \ |
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break; \ |
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case 4: \ |
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__get_user_asm("lwi", __gu_val, (ptr), (err)); \ |
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break; \ |
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case 8: \ |
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__get_user_asm_dword(__gu_val, (ptr), (err)); \ |
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break; \ |
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default: \ |
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BUILD_BUG(); \ |
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break; \ |
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} \ |
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(x) = (__force __typeof__(*(ptr)))__gu_val; \ |
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} while (0) |
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#define __get_user_asm(inst, x, addr, err) \ |
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__asm__ __volatile__ ( \ |
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"1: "inst" %1,[%2]\n" \ |
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"2:\n" \ |
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" .section .fixup,\"ax\"\n" \ |
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" .align 2\n" \ |
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"3: move %0, %3\n" \ |
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" move %1, #0\n" \ |
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" b 2b\n" \ |
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" .previous\n" \ |
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" .section __ex_table,\"a\"\n" \ |
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" .align 3\n" \ |
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" .long 1b, 3b\n" \ |
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" .previous" \ |
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: "+r" (err), "=&r" (x) \ |
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: "r" (addr), "i" (-EFAULT) \ |
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: "cc") |
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#ifdef __NDS32_EB__ |
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#define __gu_reg_oper0 "%H1" |
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#define __gu_reg_oper1 "%L1" |
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#else |
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#define __gu_reg_oper0 "%L1" |
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#define __gu_reg_oper1 "%H1" |
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#endif |
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#define __get_user_asm_dword(x, addr, err) \ |
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__asm__ __volatile__ ( \ |
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"\n1:\tlwi " __gu_reg_oper0 ",[%2]\n" \ |
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"\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n" \ |
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"3:\n" \ |
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" .section .fixup,\"ax\"\n" \ |
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" .align 2\n" \ |
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"4: move %0, %3\n" \ |
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" b 3b\n" \ |
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" .previous\n" \ |
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" .section __ex_table,\"a\"\n" \ |
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" .align 3\n" \ |
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" .long 1b, 4b\n" \ |
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" .long 2b, 4b\n" \ |
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" .previous" \ |
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: "+r"(err), "=&r"(x) \ |
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: "r"(addr), "i"(-EFAULT) \ |
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: "cc") |
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#define put_user __put_user \ |
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#define __put_user(x, ptr) \ |
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({ \ |
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long __pu_err = 0; \ |
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__put_user_err((x), (ptr), __pu_err); \ |
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__pu_err; \ |
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}) |
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#define __put_user_error(x, ptr, err) \ |
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({ \ |
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__put_user_err((x), (ptr), (err)); \ |
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(void)0; \ |
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}) |
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#define __put_user_check(x, ptr, err) \ |
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({ \ |
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__typeof__(*(ptr)) __user *__p = (ptr); \ |
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might_fault(); \ |
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if (access_ok(__p, sizeof(*__p))) { \ |
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__put_user_err((x), __p, (err)); \ |
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} else { \ |
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(err) = -EFAULT; \ |
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} \ |
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}) |
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#define __put_user_err(x, ptr, err) \ |
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do { \ |
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__typeof__(*(ptr)) __pu_val = (x); \ |
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__chk_user_ptr(ptr); \ |
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switch (sizeof(*(ptr))) { \ |
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case 1: \ |
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__put_user_asm("sbi", __pu_val, (ptr), (err)); \ |
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break; \ |
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case 2: \ |
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__put_user_asm("shi", __pu_val, (ptr), (err)); \ |
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break; \ |
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case 4: \ |
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__put_user_asm("swi", __pu_val, (ptr), (err)); \ |
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break; \ |
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case 8: \ |
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__put_user_asm_dword(__pu_val, (ptr), (err)); \ |
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break; \ |
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default: \ |
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BUILD_BUG(); \ |
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break; \ |
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} \ |
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} while (0) |
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#define __put_user_asm(inst, x, addr, err) \ |
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__asm__ __volatile__ ( \ |
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"1: "inst" %1,[%2]\n" \ |
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"2:\n" \ |
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" .section .fixup,\"ax\"\n" \ |
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" .align 2\n" \ |
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"3: move %0, %3\n" \ |
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" b 2b\n" \ |
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" .previous\n" \ |
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" .section __ex_table,\"a\"\n" \ |
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" .align 3\n" \ |
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" .long 1b, 3b\n" \ |
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" .previous" \ |
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: "+r" (err) \ |
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: "r" (x), "r" (addr), "i" (-EFAULT) \ |
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: "cc") |
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#ifdef __NDS32_EB__ |
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#define __pu_reg_oper0 "%H2" |
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#define __pu_reg_oper1 "%L2" |
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#else |
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#define __pu_reg_oper0 "%L2" |
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#define __pu_reg_oper1 "%H2" |
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#endif |
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#define __put_user_asm_dword(x, addr, err) \ |
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__asm__ __volatile__ ( \ |
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"\n1:\tswi " __pu_reg_oper0 ",[%1]\n" \ |
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"\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n" \ |
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"3:\n" \ |
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" .section .fixup,\"ax\"\n" \ |
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" .align 2\n" \ |
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"4: move %0, %3\n" \ |
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" b 3b\n" \ |
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" .previous\n" \ |
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" .section __ex_table,\"a\"\n" \ |
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" .align 3\n" \ |
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" .long 1b, 4b\n" \ |
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" .long 2b, 4b\n" \ |
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" .previous" \ |
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: "+r"(err) \ |
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: "r"(addr), "r"(x), "i"(-EFAULT) \ |
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: "cc") |
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extern unsigned long __arch_clear_user(void __user * addr, unsigned long n); |
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extern long strncpy_from_user(char *dest, const char __user * src, long count); |
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extern __must_check long strlen_user(const char __user * str); |
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extern __must_check long strnlen_user(const char __user * str, long n); |
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extern unsigned long __arch_copy_from_user(void *to, const void __user * from, |
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unsigned long n); |
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extern unsigned long __arch_copy_to_user(void __user * to, const void *from, |
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unsigned long n); |
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#define raw_copy_from_user __arch_copy_from_user |
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#define raw_copy_to_user __arch_copy_to_user |
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#define INLINE_COPY_FROM_USER |
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#define INLINE_COPY_TO_USER |
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static inline unsigned long clear_user(void __user * to, unsigned long n) |
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{ |
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if (access_ok(to, n)) |
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n = __arch_clear_user(to, n); |
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return n; |
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} |
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static inline unsigned long __clear_user(void __user * to, unsigned long n) |
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{ |
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return __arch_clear_user(to, n); |
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} |
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#endif /* _ASMNDS32_UACCESS_H */
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