| /* SPDX-License-Identifier: GPL-2.0 */ |
| // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
| |
| #ifndef __ASM_CSKY_UACCESS_H |
| #define __ASM_CSKY_UACCESS_H |
| |
| /* |
| * User space memory access functions |
| */ |
| #include <linux/compiler.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/sched.h> |
| #include <linux/string.h> |
| #include <linux/version.h> |
| #include <asm/segment.h> |
| |
| static inline int access_ok(const void *addr, unsigned long size) |
| { |
| unsigned long limit = current_thread_info()->addr_limit.seg; |
| |
| return (((unsigned long)addr < limit) && |
| ((unsigned long)(addr + size) < limit)); |
| } |
| |
| #define __addr_ok(addr) (access_ok(addr, 0)) |
| |
| extern int __put_user_bad(void); |
| |
| /* |
| * Tell gcc we read from memory instead of writing: this is because |
| * we do not write to any memory gcc knows about, so there are no |
| * aliasing issues. |
| */ |
| |
| /* |
| * These are the main single-value transfer routines. They automatically |
| * use the right size if we just have the right pointer type. |
| * |
| * This gets kind of ugly. We want to return _two_ values in "get_user()" |
| * and yet we don't want to do any pointers, because that is too much |
| * of a performance impact. Thus we have a few rather ugly macros here, |
| * and hide all the ugliness from the user. |
| * |
| * The "__xxx" versions of the user access functions are versions that |
| * do not verify the address space, that must have been done previously |
| * with a separate "access_ok()" call (this is used when we do multiple |
| * accesses to the same area of user memory). |
| * |
| * As we use the same address space for kernel and user data on |
| * Ckcore, we can just do these as direct assignments. (Of course, the |
| * exception handling means that it's no longer "just"...) |
| */ |
| |
| #define put_user(x, ptr) \ |
| __put_user_check((x), (ptr), sizeof(*(ptr))) |
| |
| #define __put_user(x, ptr) \ |
| __put_user_nocheck((x), (ptr), sizeof(*(ptr))) |
| |
| #define __ptr(x) ((unsigned long *)(x)) |
| |
| #define get_user(x, ptr) \ |
| __get_user_check((x), (ptr), sizeof(*(ptr))) |
| |
| #define __get_user(x, ptr) \ |
| __get_user_nocheck((x), (ptr), sizeof(*(ptr))) |
| |
| #define __put_user_nocheck(x, ptr, size) \ |
| ({ \ |
| long __pu_err = 0; \ |
| typeof(*(ptr)) *__pu_addr = (ptr); \ |
| typeof(*(ptr)) __pu_val = (typeof(*(ptr)))(x); \ |
| if (__pu_addr) \ |
| __put_user_size(__pu_val, (__pu_addr), (size), \ |
| __pu_err); \ |
| __pu_err; \ |
| }) |
| |
| #define __put_user_check(x, ptr, size) \ |
| ({ \ |
| long __pu_err = -EFAULT; \ |
| typeof(*(ptr)) *__pu_addr = (ptr); \ |
| typeof(*(ptr)) __pu_val = (typeof(*(ptr)))(x); \ |
| if (access_ok(__pu_addr, size) && __pu_addr) \ |
| __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \ |
| __pu_err; \ |
| }) |
| |
| #define __put_user_size(x, ptr, size, retval) \ |
| do { \ |
| retval = 0; \ |
| switch (size) { \ |
| case 1: \ |
| __put_user_asm_b(x, ptr, retval); \ |
| break; \ |
| case 2: \ |
| __put_user_asm_h(x, ptr, retval); \ |
| break; \ |
| case 4: \ |
| __put_user_asm_w(x, ptr, retval); \ |
| break; \ |
| case 8: \ |
| __put_user_asm_64(x, ptr, retval); \ |
| break; \ |
| default: \ |
| __put_user_bad(); \ |
| } \ |
| } while (0) |
| |
| /* |
| * We don't tell gcc that we are accessing memory, but this is OK |
| * because we do not write to any memory gcc knows about, so there |
| * are no aliasing issues. |
| * |
| * Note that PC at a fault is the address *after* the faulting |
| * instruction. |
| */ |
| #define __put_user_asm_b(x, ptr, err) \ |
| do { \ |
| int errcode; \ |
| asm volatile( \ |
| "1: stb %1, (%2,0) \n" \ |
| " br 3f \n" \ |
| "2: mov %0, %3 \n" \ |
| " br 3f \n" \ |
| ".section __ex_table, \"a\" \n" \ |
| ".align 2 \n" \ |
| ".long 1b,2b \n" \ |
| ".previous \n" \ |
| "3: \n" \ |
| : "=r"(err), "=r"(x), "=r"(ptr), "=r"(errcode) \ |
| : "0"(err), "1"(x), "2"(ptr), "3"(-EFAULT) \ |
| : "memory"); \ |
| } while (0) |
| |
| #define __put_user_asm_h(x, ptr, err) \ |
| do { \ |
| int errcode; \ |
| asm volatile( \ |
| "1: sth %1, (%2,0) \n" \ |
| " br 3f \n" \ |
| "2: mov %0, %3 \n" \ |
| " br 3f \n" \ |
| ".section __ex_table, \"a\" \n" \ |
| ".align 2 \n" \ |
| ".long 1b,2b \n" \ |
| ".previous \n" \ |
| "3: \n" \ |
| : "=r"(err), "=r"(x), "=r"(ptr), "=r"(errcode) \ |
| : "0"(err), "1"(x), "2"(ptr), "3"(-EFAULT) \ |
| : "memory"); \ |
| } while (0) |
| |
| #define __put_user_asm_w(x, ptr, err) \ |
| do { \ |
| int errcode; \ |
| asm volatile( \ |
| "1: stw %1, (%2,0) \n" \ |
| " br 3f \n" \ |
| "2: mov %0, %3 \n" \ |
| " br 3f \n" \ |
| ".section __ex_table,\"a\" \n" \ |
| ".align 2 \n" \ |
| ".long 1b, 2b \n" \ |
| ".previous \n" \ |
| "3: \n" \ |
| : "=r"(err), "=r"(x), "=r"(ptr), "=r"(errcode) \ |
| : "0"(err), "1"(x), "2"(ptr), "3"(-EFAULT) \ |
| : "memory"); \ |
| } while (0) |
| |
| #define __put_user_asm_64(x, ptr, err) \ |
| do { \ |
| int tmp; \ |
| int errcode; \ |
| typeof(*(ptr))src = (typeof(*(ptr)))x; \ |
| typeof(*(ptr))*psrc = &src; \ |
| \ |
| asm volatile( \ |
| " ldw %3, (%1, 0) \n" \ |
| "1: stw %3, (%2, 0) \n" \ |
| " ldw %3, (%1, 4) \n" \ |
| "2: stw %3, (%2, 4) \n" \ |
| " br 4f \n" \ |
| "3: mov %0, %4 \n" \ |
| " br 4f \n" \ |
| ".section __ex_table, \"a\" \n" \ |
| ".align 2 \n" \ |
| ".long 1b, 3b \n" \ |
| ".long 2b, 3b \n" \ |
| ".previous \n" \ |
| "4: \n" \ |
| : "=r"(err), "=r"(psrc), "=r"(ptr), \ |
| "=r"(tmp), "=r"(errcode) \ |
| : "0"(err), "1"(psrc), "2"(ptr), "3"(0), "4"(-EFAULT) \ |
| : "memory"); \ |
| } while (0) |
| |
| #define __get_user_nocheck(x, ptr, size) \ |
| ({ \ |
| long __gu_err; \ |
| __get_user_size(x, (ptr), (size), __gu_err); \ |
| __gu_err; \ |
| }) |
| |
| #define __get_user_check(x, ptr, size) \ |
| ({ \ |
| int __gu_err = -EFAULT; \ |
| const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ |
| if (access_ok(__gu_ptr, size) && __gu_ptr) \ |
| __get_user_size(x, __gu_ptr, size, __gu_err); \ |
| __gu_err; \ |
| }) |
| |
| #define __get_user_size(x, ptr, size, retval) \ |
| do { \ |
| switch (size) { \ |
| case 1: \ |
| __get_user_asm_common((x), ptr, "ldb", retval); \ |
| break; \ |
| case 2: \ |
| __get_user_asm_common((x), ptr, "ldh", retval); \ |
| break; \ |
| case 4: \ |
| __get_user_asm_common((x), ptr, "ldw", retval); \ |
| break; \ |
| default: \ |
| x = 0; \ |
| (retval) = __get_user_bad(); \ |
| } \ |
| } while (0) |
| |
| #define __get_user_asm_common(x, ptr, ins, err) \ |
| do { \ |
| int errcode; \ |
| asm volatile( \ |
| "1: " ins " %1, (%4,0) \n" \ |
| " br 3f \n" \ |
| /* Fix up codes */ \ |
| "2: mov %0, %2 \n" \ |
| " movi %1, 0 \n" \ |
| " br 3f \n" \ |
| ".section __ex_table,\"a\" \n" \ |
| ".align 2 \n" \ |
| ".long 1b, 2b \n" \ |
| ".previous \n" \ |
| "3: \n" \ |
| : "=r"(err), "=r"(x), "=r"(errcode) \ |
| : "0"(0), "r"(ptr), "2"(-EFAULT) \ |
| : "memory"); \ |
| } while (0) |
| |
| extern int __get_user_bad(void); |
| |
| #define ___copy_to_user(to, from, n) \ |
| do { \ |
| int w0, w1, w2, w3; \ |
| asm volatile( \ |
| "0: cmpnei %1, 0 \n" \ |
| " bf 8f \n" \ |
| " mov %3, %1 \n" \ |
| " or %3, %2 \n" \ |
| " andi %3, 3 \n" \ |
| " cmpnei %3, 0 \n" \ |
| " bf 1f \n" \ |
| " br 5f \n" \ |
| "1: cmplti %0, 16 \n" /* 4W */ \ |
| " bt 3f \n" \ |
| " ldw %3, (%2, 0) \n" \ |
| " ldw %4, (%2, 4) \n" \ |
| " ldw %5, (%2, 8) \n" \ |
| " ldw %6, (%2, 12) \n" \ |
| "2: stw %3, (%1, 0) \n" \ |
| "9: stw %4, (%1, 4) \n" \ |
| "10: stw %5, (%1, 8) \n" \ |
| "11: stw %6, (%1, 12) \n" \ |
| " addi %2, 16 \n" \ |
| " addi %1, 16 \n" \ |
| " subi %0, 16 \n" \ |
| " br 1b \n" \ |
| "3: cmplti %0, 4 \n" /* 1W */ \ |
| " bt 5f \n" \ |
| " ldw %3, (%2, 0) \n" \ |
| "4: stw %3, (%1, 0) \n" \ |
| " addi %2, 4 \n" \ |
| " addi %1, 4 \n" \ |
| " subi %0, 4 \n" \ |
| " br 3b \n" \ |
| "5: cmpnei %0, 0 \n" /* 1B */ \ |
| " bf 13f \n" \ |
| " ldb %3, (%2, 0) \n" \ |
| "6: stb %3, (%1, 0) \n" \ |
| " addi %2, 1 \n" \ |
| " addi %1, 1 \n" \ |
| " subi %0, 1 \n" \ |
| " br 5b \n" \ |
| "7: subi %0, 4 \n" \ |
| "8: subi %0, 4 \n" \ |
| "12: subi %0, 4 \n" \ |
| " br 13f \n" \ |
| ".section __ex_table, \"a\" \n" \ |
| ".align 2 \n" \ |
| ".long 2b, 13f \n" \ |
| ".long 4b, 13f \n" \ |
| ".long 6b, 13f \n" \ |
| ".long 9b, 12b \n" \ |
| ".long 10b, 8b \n" \ |
| ".long 11b, 7b \n" \ |
| ".previous \n" \ |
| "13: \n" \ |
| : "=r"(n), "=r"(to), "=r"(from), "=r"(w0), \ |
| "=r"(w1), "=r"(w2), "=r"(w3) \ |
| : "0"(n), "1"(to), "2"(from) \ |
| : "memory"); \ |
| } while (0) |
| |
| #define ___copy_from_user(to, from, n) \ |
| do { \ |
| int tmp; \ |
| int nsave; \ |
| asm volatile( \ |
| "0: cmpnei %1, 0 \n" \ |
| " bf 7f \n" \ |
| " mov %3, %1 \n" \ |
| " or %3, %2 \n" \ |
| " andi %3, 3 \n" \ |
| " cmpnei %3, 0 \n" \ |
| " bf 1f \n" \ |
| " br 5f \n" \ |
| "1: cmplti %0, 16 \n" \ |
| " bt 3f \n" \ |
| "2: ldw %3, (%2, 0) \n" \ |
| "10: ldw %4, (%2, 4) \n" \ |
| " stw %3, (%1, 0) \n" \ |
| " stw %4, (%1, 4) \n" \ |
| "11: ldw %3, (%2, 8) \n" \ |
| "12: ldw %4, (%2, 12) \n" \ |
| " stw %3, (%1, 8) \n" \ |
| " stw %4, (%1, 12) \n" \ |
| " addi %2, 16 \n" \ |
| " addi %1, 16 \n" \ |
| " subi %0, 16 \n" \ |
| " br 1b \n" \ |
| "3: cmplti %0, 4 \n" \ |
| " bt 5f \n" \ |
| "4: ldw %3, (%2, 0) \n" \ |
| " stw %3, (%1, 0) \n" \ |
| " addi %2, 4 \n" \ |
| " addi %1, 4 \n" \ |
| " subi %0, 4 \n" \ |
| " br 3b \n" \ |
| "5: cmpnei %0, 0 \n" \ |
| " bf 7f \n" \ |
| "6: ldb %3, (%2, 0) \n" \ |
| " stb %3, (%1, 0) \n" \ |
| " addi %2, 1 \n" \ |
| " addi %1, 1 \n" \ |
| " subi %0, 1 \n" \ |
| " br 5b \n" \ |
| "8: stw %3, (%1, 0) \n" \ |
| " subi %0, 4 \n" \ |
| " bf 7f \n" \ |
| "9: subi %0, 8 \n" \ |
| " bf 7f \n" \ |
| "13: stw %3, (%1, 8) \n" \ |
| " subi %0, 12 \n" \ |
| " bf 7f \n" \ |
| ".section __ex_table, \"a\" \n" \ |
| ".align 2 \n" \ |
| ".long 2b, 7f \n" \ |
| ".long 4b, 7f \n" \ |
| ".long 6b, 7f \n" \ |
| ".long 10b, 8b \n" \ |
| ".long 11b, 9b \n" \ |
| ".long 12b,13b \n" \ |
| ".previous \n" \ |
| "7: \n" \ |
| : "=r"(n), "=r"(to), "=r"(from), "=r"(nsave), \ |
| "=r"(tmp) \ |
| : "0"(n), "1"(to), "2"(from) \ |
| : "memory"); \ |
| } while (0) |
| |
| unsigned long raw_copy_from_user(void *to, const void *from, unsigned long n); |
| unsigned long raw_copy_to_user(void *to, const void *from, unsigned long n); |
| |
| unsigned long clear_user(void *to, unsigned long n); |
| unsigned long __clear_user(void __user *to, unsigned long n); |
| |
| long strncpy_from_user(char *dst, const char *src, long count); |
| long __strncpy_from_user(char *dst, const char *src, long count); |
| |
| /* |
| * Return the size of a string (including the ending 0) |
| * |
| * Return 0 on exception, a value greater than N if too long |
| */ |
| long strnlen_user(const char *src, long n); |
| |
| #define strlen_user(str) strnlen_user(str, 32767) |
| |
| struct exception_table_entry { |
| unsigned long insn; |
| unsigned long nextinsn; |
| }; |
| |
| extern int fixup_exception(struct pt_regs *regs); |
| |
| #endif /* __ASM_CSKY_UACCESS_H */ |
