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Diffstat (limited to 'arch/alpha/include/asm/uaccess.h')
| -rw-r--r-- | arch/alpha/include/asm/uaccess.h | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/uaccess.h b/arch/alpha/include/asm/uaccess.h new file mode 100644 index 000000000..c32c2584c --- /dev/null +++ b/arch/alpha/include/asm/uaccess.h @@ -0,0 +1,292 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ALPHA_UACCESS_H +#define __ALPHA_UACCESS_H + +#include <asm-generic/access_ok.h> +/* + * These are the main single-value transfer routines. They automatically + * use the right size if we just have the right pointer type. + * + * As the alpha uses the same address space for kernel and user + * data, we can just do these as direct assignments. (Of course, the + * exception handling means that it's no longer "just"...) + * + * Careful to not + * (a) re-use the arguments for side effects (sizeof/typeof is ok) + * (b) require any knowledge of processes at this stage + */ +#define put_user(x, ptr) \ + __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) +#define get_user(x, ptr) \ + __get_user_check((x), (ptr), sizeof(*(ptr))) + +/* + * The "__xxx" versions do not do address space checking, useful when + * doing multiple accesses to the same area (the programmer has to do the + * checks by hand with "access_ok()") + */ +#define __put_user(x, ptr) \ + __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) +#define __get_user(x, ptr) \ + __get_user_nocheck((x), (ptr), sizeof(*(ptr))) + +/* + * The "lda %1, 2b-1b(%0)" bits are magic to get the assembler to + * encode the bits we need for resolving the exception. See the + * more extensive comments with fixup_inline_exception below for + * more information. + */ +#define EXC(label,cont,res,err) \ + ".section __ex_table,\"a\"\n" \ + " .long "#label"-.\n" \ + " lda "#res","#cont"-"#label"("#err")\n" \ + ".previous\n" + +extern void __get_user_unknown(void); + +#define __get_user_nocheck(x, ptr, size) \ +({ \ + long __gu_err = 0; \ + unsigned long __gu_val; \ + __chk_user_ptr(ptr); \ + switch (size) { \ + case 1: __get_user_8(ptr); break; \ + case 2: __get_user_16(ptr); break; \ + case 4: __get_user_32(ptr); break; \ + case 8: __get_user_64(ptr); break; \ + default: __get_user_unknown(); break; \ + } \ + (x) = (__force __typeof__(*(ptr))) __gu_val; \ + __gu_err; \ +}) + +#define __get_user_check(x, ptr, size) \ +({ \ + long __gu_err = -EFAULT; \ + unsigned long __gu_val = 0; \ + const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ + if (__access_ok(__gu_addr, size)) { \ + __gu_err = 0; \ + switch (size) { \ + case 1: __get_user_8(__gu_addr); break; \ + case 2: __get_user_16(__gu_addr); break; \ + case 4: __get_user_32(__gu_addr); break; \ + case 8: __get_user_64(__gu_addr); break; \ + default: __get_user_unknown(); break; \ + } \ + } \ + (x) = (__force __typeof__(*(ptr))) __gu_val; \ + __gu_err; \ +}) + +struct __large_struct { unsigned long buf[100]; }; +#define __m(x) (*(struct __large_struct __user *)(x)) + +#define __get_user_64(addr) \ + __asm__("1: ldq %0,%2\n" \ + "2:\n" \ + EXC(1b,2b,%0,%1) \ + : "=r"(__gu_val), "=r"(__gu_err) \ + : "m"(__m(addr)), "1"(__gu_err)) + +#define __get_user_32(addr) \ + __asm__("1: ldl %0,%2\n" \ + "2:\n" \ + EXC(1b,2b,%0,%1) \ + : "=r"(__gu_val), "=r"(__gu_err) \ + : "m"(__m(addr)), "1"(__gu_err)) + +#ifdef __alpha_bwx__ +/* Those lucky bastards with ev56 and later CPUs can do byte/word moves. */ + +#define __get_user_16(addr) \ + __asm__("1: ldwu %0,%2\n" \ + "2:\n" \ + EXC(1b,2b,%0,%1) \ + : "=r"(__gu_val), "=r"(__gu_err) \ + : "m"(__m(addr)), "1"(__gu_err)) + +#define __get_user_8(addr) \ + __asm__("1: ldbu %0,%2\n" \ + "2:\n" \ + EXC(1b,2b,%0,%1) \ + : "=r"(__gu_val), "=r"(__gu_err) \ + : "m"(__m(addr)), "1"(__gu_err)) +#else +/* Unfortunately, we can't get an unaligned access trap for the sub-word + load, so we have to do a general unaligned operation. */ + +#define __get_user_16(addr) \ +{ \ + long __gu_tmp; \ + __asm__("1: ldq_u %0,0(%3)\n" \ + "2: ldq_u %1,1(%3)\n" \ + " extwl %0,%3,%0\n" \ + " extwh %1,%3,%1\n" \ + " or %0,%1,%0\n" \ + "3:\n" \ + EXC(1b,3b,%0,%2) \ + EXC(2b,3b,%0,%2) \ + : "=&r"(__gu_val), "=&r"(__gu_tmp), "=r"(__gu_err) \ + : "r"(addr), "2"(__gu_err)); \ +} + +#define __get_user_8(addr) \ + __asm__("1: ldq_u %0,0(%2)\n" \ + " extbl %0,%2,%0\n" \ + "2:\n" \ + EXC(1b,2b,%0,%1) \ + : "=&r"(__gu_val), "=r"(__gu_err) \ + : "r"(addr), "1"(__gu_err)) +#endif + +extern void __put_user_unknown(void); + +#define __put_user_nocheck(x, ptr, size) \ +({ \ + long __pu_err = 0; \ + __chk_user_ptr(ptr); \ + switch (size) { \ + case 1: __put_user_8(x, ptr); break; \ + case 2: __put_user_16(x, ptr); break; \ + case 4: __put_user_32(x, ptr); break; \ + case 8: __put_user_64(x, ptr); break; \ + default: __put_user_unknown(); break; \ + } \ + __pu_err; \ +}) + +#define __put_user_check(x, ptr, size) \ +({ \ + long __pu_err = -EFAULT; \ + __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ + if (__access_ok(__pu_addr, size)) { \ + __pu_err = 0; \ + switch (size) { \ + case 1: __put_user_8(x, __pu_addr); break; \ + case 2: __put_user_16(x, __pu_addr); break; \ + case 4: __put_user_32(x, __pu_addr); break; \ + case 8: __put_user_64(x, __pu_addr); break; \ + default: __put_user_unknown(); break; \ + } \ + } \ + __pu_err; \ +}) + +/* + * The "__put_user_xx()" macros tell gcc they read from memory + * instead of writing: this is because they do not write to + * any memory gcc knows about, so there are no aliasing issues + */ +#define __put_user_64(x, addr) \ +__asm__ __volatile__("1: stq %r2,%1\n" \ + "2:\n" \ + EXC(1b,2b,$31,%0) \ + : "=r"(__pu_err) \ + : "m" (__m(addr)), "rJ" (x), "0"(__pu_err)) + +#define __put_user_32(x, addr) \ +__asm__ __volatile__("1: stl %r2,%1\n" \ + "2:\n" \ + EXC(1b,2b,$31,%0) \ + : "=r"(__pu_err) \ + : "m"(__m(addr)), "rJ"(x), "0"(__pu_err)) + +#ifdef __alpha_bwx__ +/* Those lucky bastards with ev56 and later CPUs can do byte/word moves. */ + +#define __put_user_16(x, addr) \ +__asm__ __volatile__("1: stw %r2,%1\n" \ + "2:\n" \ + EXC(1b,2b,$31,%0) \ + : "=r"(__pu_err) \ + : "m"(__m(addr)), "rJ"(x), "0"(__pu_err)) + +#define __put_user_8(x, addr) \ +__asm__ __volatile__("1: stb %r2,%1\n" \ + "2:\n" \ + EXC(1b,2b,$31,%0) \ + : "=r"(__pu_err) \ + : "m"(__m(addr)), "rJ"(x), "0"(__pu_err)) +#else +/* Unfortunately, we can't get an unaligned access trap for the sub-word + write, so we have to do a general unaligned operation. */ + +#define __put_user_16(x, addr) \ +{ \ + long __pu_tmp1, __pu_tmp2, __pu_tmp3, __pu_tmp4; \ + __asm__ __volatile__( \ + "1: ldq_u %2,1(%5)\n" \ + "2: ldq_u %1,0(%5)\n" \ + " inswh %6,%5,%4\n" \ + " inswl %6,%5,%3\n" \ + " mskwh %2,%5,%2\n" \ + " mskwl %1,%5,%1\n" \ + " or %2,%4,%2\n" \ + " or %1,%3,%1\n" \ + "3: stq_u %2,1(%5)\n" \ + "4: stq_u %1,0(%5)\n" \ + "5:\n" \ + EXC(1b,5b,$31,%0) \ + EXC(2b,5b,$31,%0) \ + EXC(3b,5b,$31,%0) \ + EXC(4b,5b,$31,%0) \ + : "=r"(__pu_err), "=&r"(__pu_tmp1), \ + "=&r"(__pu_tmp2), "=&r"(__pu_tmp3), \ + "=&r"(__pu_tmp4) \ + : "r"(addr), "r"((unsigned long)(x)), "0"(__pu_err)); \ +} + +#define __put_user_8(x, addr) \ +{ \ + long __pu_tmp1, __pu_tmp2; \ + __asm__ __volatile__( \ + "1: ldq_u %1,0(%4)\n" \ + " insbl %3,%4,%2\n" \ + " mskbl %1,%4,%1\n" \ + " or %1,%2,%1\n" \ + "2: stq_u %1,0(%4)\n" \ + "3:\n" \ + EXC(1b,3b,$31,%0) \ + EXC(2b,3b,$31,%0) \ + : "=r"(__pu_err), \ + "=&r"(__pu_tmp1), "=&r"(__pu_tmp2) \ + : "r"((unsigned long)(x)), "r"(addr), "0"(__pu_err)); \ +} +#endif + + +/* + * Complex access routines + */ + +extern long __copy_user(void *to, const void *from, long len); + +static inline unsigned long +raw_copy_from_user(void *to, const void __user *from, unsigned long len) +{ + return __copy_user(to, (__force const void *)from, len); +} + +static inline unsigned long +raw_copy_to_user(void __user *to, const void *from, unsigned long len) +{ + return __copy_user((__force void *)to, from, len); +} + +extern long __clear_user(void __user *to, long len); + +static inline long +clear_user(void __user *to, long len) +{ + if (__access_ok(to, len)) + len = __clear_user(to, len); + return len; +} + +extern long strncpy_from_user(char *dest, const char __user *src, long count); +extern __must_check long strnlen_user(const char __user *str, long n); + +#include <asm/extable.h> + +#endif /* __ALPHA_UACCESS_H */ |