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202 lines
6.0 KiB
202 lines
6.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_UACCESS_H |
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#define _ASM_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/compiler.h> |
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#include <linux/string.h> |
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#include <asm/asi.h> |
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#include <asm/spitfire.h> |
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#include <asm/processor.h> |
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/* |
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* Sparc64 is segmented, though more like the M68K than the I386. |
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* We use the secondary ASI to address user memory, which references a |
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* completely different VM map, thus there is zero chance of the user |
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* doing something queer and tricking us into poking kernel memory. |
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* |
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* What is left here is basically what is needed for the other parts of |
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* the kernel that expect to be able to manipulate, erum, "segments". |
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* Or perhaps more properly, permissions. |
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* |
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* "For historical reasons, these macros are grossly misnamed." -Linus |
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*/ |
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#define KERNEL_DS ((mm_segment_t) { ASI_P }) |
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#define USER_DS ((mm_segment_t) { ASI_AIUS }) /* har har har */ |
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#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)}) |
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#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg) |
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#define set_fs(val) \ |
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do { \ |
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current_thread_info()->current_ds = (val).seg; \ |
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__asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \ |
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} while(0) |
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/* |
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* Test whether a block of memory is a valid user space address. |
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* Returns 0 if the range is valid, nonzero otherwise. |
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*/ |
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static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit) |
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{ |
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if (__builtin_constant_p(size)) |
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return addr > limit - size; |
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addr += size; |
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if (addr < size) |
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return true; |
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return addr > limit; |
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} |
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#define __range_not_ok(addr, size, limit) \ |
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({ \ |
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__chk_user_ptr(addr); \ |
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__chk_range_not_ok((unsigned long __force)(addr), size, limit); \ |
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}) |
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static inline int __access_ok(const void __user * addr, unsigned long size) |
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{ |
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return 1; |
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} |
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static inline int access_ok(const void __user * addr, unsigned long size) |
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{ |
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return 1; |
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} |
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void __retl_efault(void); |
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/* Uh, these should become the main single-value transfer routines.. |
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* They automatically use the right size if we just have the right |
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* pointer type.. |
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* |
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* This gets kind of ugly. We want to return _two_ values in "get_user()" |
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* and yet we don't want to do any pointers, because that is too much |
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* of a performance impact. Thus we have a few rather ugly macros here, |
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* and hide all the ugliness from the user. |
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*/ |
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#define put_user(x, ptr) ({ \ |
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unsigned long __pu_addr = (unsigned long)(ptr); \ |
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__chk_user_ptr(ptr); \ |
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__put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\ |
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}) |
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#define get_user(x, ptr) ({ \ |
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unsigned long __gu_addr = (unsigned long)(ptr); \ |
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__chk_user_ptr(ptr); \ |
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__get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\ |
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}) |
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#define __put_user(x, ptr) put_user(x, ptr) |
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#define __get_user(x, ptr) get_user(x, ptr) |
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struct __large_struct { unsigned long buf[100]; }; |
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#define __m(x) ((struct __large_struct *)(x)) |
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#define __put_user_nocheck(data, addr, size) ({ \ |
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register int __pu_ret; \ |
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switch (size) { \ |
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case 1: __put_user_asm(data, b, addr, __pu_ret); break; \ |
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case 2: __put_user_asm(data, h, addr, __pu_ret); break; \ |
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case 4: __put_user_asm(data, w, addr, __pu_ret); break; \ |
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case 8: __put_user_asm(data, x, addr, __pu_ret); break; \ |
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default: __pu_ret = __put_user_bad(); break; \ |
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} \ |
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__pu_ret; \ |
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}) |
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#define __put_user_asm(x, size, addr, ret) \ |
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__asm__ __volatile__( \ |
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"/* Put user asm, inline. */\n" \ |
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"1:\t" "st"#size "a %1, [%2] %%asi\n\t" \ |
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"clr %0\n" \ |
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"2:\n\n\t" \ |
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".section .fixup,#alloc,#execinstr\n\t" \ |
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".align 4\n" \ |
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"3:\n\t" \ |
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"sethi %%hi(2b), %0\n\t" \ |
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"jmpl %0 + %%lo(2b), %%g0\n\t" \ |
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" mov %3, %0\n\n\t" \ |
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".previous\n\t" \ |
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".section __ex_table,\"a\"\n\t" \ |
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".align 4\n\t" \ |
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".word 1b, 3b\n\t" \ |
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".previous\n\n\t" \ |
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: "=r" (ret) : "r" (x), "r" (__m(addr)), \ |
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"i" (-EFAULT)) |
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int __put_user_bad(void); |
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#define __get_user_nocheck(data, addr, size, type) ({ \ |
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register int __gu_ret; \ |
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register unsigned long __gu_val; \ |
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switch (size) { \ |
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case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \ |
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case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \ |
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case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \ |
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case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break; \ |
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default: \ |
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__gu_val = 0; \ |
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__gu_ret = __get_user_bad(); \ |
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break; \ |
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} \ |
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data = (__force type) __gu_val; \ |
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__gu_ret; \ |
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}) |
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#define __get_user_asm(x, size, addr, ret) \ |
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__asm__ __volatile__( \ |
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"/* Get user asm, inline. */\n" \ |
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"1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \ |
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"clr %0\n" \ |
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"2:\n\n\t" \ |
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".section .fixup,#alloc,#execinstr\n\t" \ |
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".align 4\n" \ |
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"3:\n\t" \ |
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"sethi %%hi(2b), %0\n\t" \ |
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"clr %1\n\t" \ |
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"jmpl %0 + %%lo(2b), %%g0\n\t" \ |
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" mov %3, %0\n\n\t" \ |
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".previous\n\t" \ |
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".section __ex_table,\"a\"\n\t" \ |
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".align 4\n\t" \ |
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".word 1b, 3b\n\n\t" \ |
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".previous\n\t" \ |
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: "=r" (ret), "=r" (x) : "r" (__m(addr)), \ |
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"i" (-EFAULT)) |
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int __get_user_bad(void); |
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unsigned long __must_check raw_copy_from_user(void *to, |
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const void __user *from, |
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unsigned long size); |
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unsigned long __must_check raw_copy_to_user(void __user *to, |
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const void *from, |
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unsigned long size); |
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#define INLINE_COPY_FROM_USER |
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#define INLINE_COPY_TO_USER |
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unsigned long __must_check raw_copy_in_user(void __user *to, |
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const void __user *from, |
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unsigned long size); |
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unsigned long __must_check __clear_user(void __user *, unsigned long); |
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#define clear_user __clear_user |
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__must_check long strnlen_user(const char __user *str, long n); |
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struct pt_regs; |
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unsigned long compute_effective_address(struct pt_regs *, |
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unsigned int insn, |
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unsigned int rd); |
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#endif /* _ASM_UACCESS_H */
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