diff options
Diffstat (limited to 'arch/csky/include/asm/uaccess.h')
| -rw-r--r-- | arch/csky/include/asm/uaccess.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/arch/csky/include/asm/uaccess.h b/arch/csky/include/asm/uaccess.h new file mode 100644 index 000000000..2e927c21d --- /dev/null +++ b/arch/csky/include/asm/uaccess.h @@ -0,0 +1,203 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __ASM_CSKY_UACCESS_H +#define __ASM_CSKY_UACCESS_H + +/* + * __put_user_fn + */ +extern int __put_user_bad(void); + +#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; \ + \ + __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"(x), "=r"(ptr), \ + "=r"(tmp), "=r"(errcode) \ + : "0"(err), "1"(x), "2"(ptr), "3"(0), \ + "4"(-EFAULT) \ + : "memory"); \ +} while (0) + +static inline int __put_user_fn(size_t size, void __user *ptr, void *x) +{ + int retval = 0; + u32 tmp; + + switch (size) { + case 1: + tmp = *(u8 *)x; + __put_user_asm_b(tmp, ptr, retval); + break; + case 2: + tmp = *(u16 *)x; + __put_user_asm_h(tmp, ptr, retval); + break; + case 4: + tmp = *(u32 *)x; + __put_user_asm_w(tmp, ptr, retval); + break; + case 8: + __put_user_asm_64(x, (u64 *)ptr, retval); + break; + } + + return retval; +} +#define __put_user_fn __put_user_fn + +/* + * __get_user_fn + */ +extern int __get_user_bad(void); + +#define __get_user_asm_common(x, ptr, ins, err) \ +do { \ + int errcode; \ + __asm__ __volatile__( \ + "1: " ins " %1, (%4, 0) \n" \ + " br 3f \n" \ + "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) + +#define __get_user_asm_64(x, ptr, err) \ +do { \ + int tmp; \ + int errcode; \ + \ + __asm__ __volatile__( \ + "1: ldw %3, (%2, 0) \n" \ + " stw %3, (%1, 0) \n" \ + "2: ldw %3, (%2, 4) \n" \ + " stw %3, (%1, 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"(x), "=r"(ptr), \ + "=r"(tmp), "=r"(errcode) \ + : "0"(err), "1"(x), "2"(ptr), "3"(0), \ + "4"(-EFAULT) \ + : "memory"); \ +} while (0) + +static inline int __get_user_fn(size_t size, const void __user *ptr, void *x) +{ + int retval; + u32 tmp; + + switch (size) { + case 1: + __get_user_asm_common(tmp, ptr, "ldb", retval); + *(u8 *)x = (u8)tmp; + break; + case 2: + __get_user_asm_common(tmp, ptr, "ldh", retval); + *(u16 *)x = (u16)tmp; + break; + case 4: + __get_user_asm_common(tmp, ptr, "ldw", retval); + *(u32 *)x = (u32)tmp; + break; + case 8: + __get_user_asm_64(x, ptr, retval); + break; + } + + return retval; +} +#define __get_user_fn __get_user_fn + +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 __user *to, unsigned long n); +#define __clear_user __clear_user + +#include <asm-generic/uaccess.h> + +#endif /* __ASM_CSKY_UACCESS_H */ |