Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Greg Ungerer | 1054 | 98.97% | 1 | 25.00% |
Sam Ravnborg | 8 | 0.75% | 1 | 25.00% |
Al Viro | 2 | 0.19% | 1 | 25.00% |
Greg Kroah-Hartman | 1 | 0.09% | 1 | 25.00% |
Total | 1065 | 4 |
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __M68K_UACCESS_H #define __M68K_UACCESS_H #ifdef CONFIG_MMU /* * User space memory access functions */ #include <linux/compiler.h> #include <linux/types.h> #include <asm/segment.h> #include <asm/extable.h> /* We let the MMU do all checking */ static inline int access_ok(const void __user *addr, unsigned long size) { return 1; } /* * Not all varients of the 68k family support the notion of address spaces. * The traditional 680x0 parts do, and they use the sfc/dfc registers and * the "moves" instruction to access user space from kernel space. Other * family members like ColdFire don't support this, and only have a single * address space, and use the usual "move" instruction for user space access. * * Outside of this difference the user space access functions are the same. * So lets keep the code simple and just define in what we need to use. */ #ifdef CONFIG_CPU_HAS_ADDRESS_SPACES #define MOVES "moves" #else #define MOVES "move" #endif extern int __put_user_bad(void); extern int __get_user_bad(void); #define __put_user_asm(res, x, ptr, bwl, reg, err) \ asm volatile ("\n" \ "1: "MOVES"."#bwl" %2,%1\n" \ "2:\n" \ " .section .fixup,\"ax\"\n" \ " .even\n" \ "10: moveq.l %3,%0\n" \ " jra 2b\n" \ " .previous\n" \ "\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ " .long 1b,10b\n" \ " .long 2b,10b\n" \ " .previous" \ : "+d" (res), "=m" (*(ptr)) \ : #reg (x), "i" (err)) /* * These are the main single-value transfer routines. They automatically * use the right size if we just have the right pointer type. */ #define __put_user(x, ptr) \ ({ \ typeof(*(ptr)) __pu_val = (x); \ int __pu_err = 0; \ __chk_user_ptr(ptr); \ switch (sizeof (*(ptr))) { \ case 1: \ __put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \ break; \ case 2: \ __put_user_asm(__pu_err, __pu_val, ptr, w, r, -EFAULT); \ break; \ case 4: \ __put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \ break; \ case 8: \ { \ const void __user *__pu_ptr = (ptr); \ asm volatile ("\n" \ "1: "MOVES".l %2,(%1)+\n" \ "2: "MOVES".l %R2,(%1)\n" \ "3:\n" \ " .section .fixup,\"ax\"\n" \ " .even\n" \ "10: movel %3,%0\n" \ " jra 3b\n" \ " .previous\n" \ "\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ " .long 1b,10b\n" \ " .long 2b,10b\n" \ " .long 3b,10b\n" \ " .previous" \ : "+d" (__pu_err), "+a" (__pu_ptr) \ : "r" (__pu_val), "i" (-EFAULT) \ : "memory"); \ break; \ } \ default: \ __pu_err = __put_user_bad(); \ break; \ } \ __pu_err; \ }) #define put_user(x, ptr) __put_user(x, ptr) #define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \ type __gu_val; \ asm volatile ("\n" \ "1: "MOVES"."#bwl" %2,%1\n" \ "2:\n" \ " .section .fixup,\"ax\"\n" \ " .even\n" \ "10: move.l %3,%0\n" \ " sub.l %1,%1\n" \ " jra 2b\n" \ " .previous\n" \ "\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ " .long 1b,10b\n" \ " .previous" \ : "+d" (res), "=&" #reg (__gu_val) \ : "m" (*(ptr)), "i" (err)); \ (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \ }) #define __get_user(x, ptr) \ ({ \ int __gu_err = 0; \ __chk_user_ptr(ptr); \ switch (sizeof(*(ptr))) { \ case 1: \ __get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \ break; \ case 2: \ __get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT); \ break; \ case 4: \ __get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \ break; \ case 8: { \ const void __user *__gu_ptr = (ptr); \ union { \ u64 l; \ __typeof__(*(ptr)) t; \ } __gu_val; \ asm volatile ("\n" \ "1: "MOVES".l (%2)+,%1\n" \ "2: "MOVES".l (%2),%R1\n" \ "3:\n" \ " .section .fixup,\"ax\"\n" \ " .even\n" \ "10: move.l %3,%0\n" \ " sub.l %1,%1\n" \ " sub.l %R1,%R1\n" \ " jra 3b\n" \ " .previous\n" \ "\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ " .long 1b,10b\n" \ " .long 2b,10b\n" \ " .previous" \ : "+d" (__gu_err), "=&r" (__gu_val.l), \ "+a" (__gu_ptr) \ : "i" (-EFAULT) \ : "memory"); \ (x) = __gu_val.t; \ break; \ } \ default: \ __gu_err = __get_user_bad(); \ break; \ } \ __gu_err; \ }) #define get_user(x, ptr) __get_user(x, ptr) unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n); unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n); #define __suffix0 #define __suffix1 b #define __suffix2 w #define __suffix4 l #define ____constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)\ asm volatile ("\n" \ "1: "MOVES"."#s1" (%2)+,%3\n" \ " move."#s1" %3,(%1)+\n" \ " .ifnc \""#s2"\",\"\"\n" \ "2: "MOVES"."#s2" (%2)+,%3\n" \ " move."#s2" %3,(%1)+\n" \ " .ifnc \""#s3"\",\"\"\n" \ "3: "MOVES"."#s3" (%2)+,%3\n" \ " move."#s3" %3,(%1)+\n" \ " .endif\n" \ " .endif\n" \ "4:\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ " .long 1b,10f\n" \ " .ifnc \""#s2"\",\"\"\n" \ " .long 2b,20f\n" \ " .ifnc \""#s3"\",\"\"\n" \ " .long 3b,30f\n" \ " .endif\n" \ " .endif\n" \ " .previous\n" \ "\n" \ " .section .fixup,\"ax\"\n" \ " .even\n" \ "10: addq.l #"#n1",%0\n" \ " .ifnc \""#s2"\",\"\"\n" \ "20: addq.l #"#n2",%0\n" \ " .ifnc \""#s3"\",\"\"\n" \ "30: addq.l #"#n3",%0\n" \ " .endif\n" \ " .endif\n" \ " jra 4b\n" \ " .previous\n" \ : "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp) \ : : "memory") #define ___constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)\ ____constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3) #define __constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3) \ ___constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, \ __suffix##n1, __suffix##n2, __suffix##n3) static __always_inline unsigned long __constant_copy_from_user(void *to, const void __user *from, unsigned long n) { unsigned long res = 0, tmp; switch (n) { case 1: __constant_copy_from_user_asm(res, to, from, tmp, 1, 0, 0); break; case 2: __constant_copy_from_user_asm(res, to, from, tmp, 2, 0, 0); break; case 3: __constant_copy_from_user_asm(res, to, from, tmp, 2, 1, 0); break; case 4: __constant_copy_from_user_asm(res, to, from, tmp, 4, 0, 0); break; case 5: __constant_copy_from_user_asm(res, to, from, tmp, 4, 1, 0); break; case 6: __constant_copy_from_user_asm(res, to, from, tmp, 4, 2, 0); break; case 7: __constant_copy_from_user_asm(res, to, from, tmp, 4, 2, 1); break; case 8: __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 0); break; case 9: __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 1); break; case 10: __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 2); break; case 12: __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 4); break; default: /* we limit the inlined version to 3 moves */ return __generic_copy_from_user(to, from, n); } return res; } #define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3) \ asm volatile ("\n" \ " move."#s1" (%2)+,%3\n" \ "11: "MOVES"."#s1" %3,(%1)+\n" \ "12: move."#s2" (%2)+,%3\n" \ "21: "MOVES"."#s2" %3,(%1)+\n" \ "22:\n" \ " .ifnc \""#s3"\",\"\"\n" \ " move."#s3" (%2)+,%3\n" \ "31: "MOVES"."#s3" %3,(%1)+\n" \ "32:\n" \ " .endif\n" \ "4:\n" \ "\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ " .long 11b,5f\n" \ " .long 12b,5f\n" \ " .long 21b,5f\n" \ " .long 22b,5f\n" \ " .ifnc \""#s3"\",\"\"\n" \ " .long 31b,5f\n" \ " .long 32b,5f\n" \ " .endif\n" \ " .previous\n" \ "\n" \ " .section .fixup,\"ax\"\n" \ " .even\n" \ "5: moveq.l #"#n",%0\n" \ " jra 4b\n" \ " .previous\n" \ : "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp) \ : : "memory") static __always_inline unsigned long __constant_copy_to_user(void __user *to, const void *from, unsigned long n) { unsigned long res = 0, tmp; switch (n) { case 1: __put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1); break; case 2: __put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, r, 2); break; case 3: __constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,); break; case 4: __put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4); break; case 5: __constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,); break; case 6: __constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,); break; case 7: __constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b); break; case 8: __constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,); break; case 9: __constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b); break; case 10: __constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w); break; case 12: __constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l); break; default: /* limit the inlined version to 3 moves */ return __generic_copy_to_user(to, from, n); } return res; } static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) { if (__builtin_constant_p(n)) return __constant_copy_from_user(to, from, n); return __generic_copy_from_user(to, from, n); } static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n) { if (__builtin_constant_p(n)) return __constant_copy_to_user(to, from, n); return __generic_copy_to_user(to, from, n); } #define INLINE_COPY_FROM_USER #define INLINE_COPY_TO_USER #define user_addr_max() \ (uaccess_kernel() ? ~0UL : TASK_SIZE) extern long strncpy_from_user(char *dst, const char __user *src, long count); extern __must_check long strnlen_user(const char __user *str, long n); unsigned long __clear_user(void __user *to, unsigned long n); #define clear_user __clear_user #else /* !CONFIG_MMU */ #include <asm-generic/uaccess.h> #endif #endif /* _M68K_UACCESS_H */
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