/* SPDX-License-Identifier: GPL-2.0 */ /* * uaccess.h: User space memore access functions. * * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #ifndef _ASM_UACCESS_H #define _ASM_UACCESS_H #include <linux/compiler.h> #include <linux/string.h> #include <asm/processor.h> #define ARCH_HAS_SORT_EXTABLE #define ARCH_HAS_SEARCH_EXTABLE /* Sparc is not segmented, however we need to be able to fool access_ok() * when doing system calls from kernel mode legitimately. * * "For historical reasons, these macros are grossly misnamed." -Linus */ #define KERNEL_DS ((mm_segment_t) { 0 }) #define USER_DS ((mm_segment_t) { -1 }) #define get_ds() (KERNEL_DS) #define get_fs() (current->thread.current_ds) #define set_fs(val) ((current->thread.current_ds) = (val)) #define segment_eq(a, b) ((a).seg == (b).seg) /* We have there a nice not-mapped page at PAGE_OFFSET - PAGE_SIZE, so that this test * can be fairly lightweight. * No one can read/write anything from userland in the kernel space by setting * large size and address near to PAGE_OFFSET - a fault will break his intentions. */ #define __user_ok(addr, size) ({ (void)(size); (addr) < STACK_TOP; }) #define __kernel_ok (uaccess_kernel()) #define __access_ok(addr, size) (__user_ok((addr) & get_fs().seg, (size))) #define access_ok(type, addr, size) \ ({ (void)(type); __access_ok((unsigned long)(addr), size); }) /* * The exception table consists of pairs of addresses: the first is the * address of an instruction that is allowed to fault, and the second is * the address at which the program should continue. No registers are * modified, so it is entirely up to the continuation code to figure out * what to do. * * All the routines below use bits of fixup code that are out of line * with the main instruction path. This means when everything is well, * we don't even have to jump over them. Further, they do not intrude * on our cache or tlb entries. * * There is a special way how to put a range of potentially faulting * insns (like twenty ldd/std's with now intervening other instructions) * You specify address of first in insn and 0 in fixup and in the next * exception_table_entry you specify last potentially faulting insn + 1 * and in fixup the routine which should handle the fault. * That fixup code will get * (faulting_insn_address - first_insn_in_the_range_address)/4 * in %g2 (ie. index of the faulting instruction in the range). */ struct exception_table_entry { unsigned long insn, fixup; }; /* Returns 0 if exception not found and fixup otherwise. */ unsigned long search_extables_range(unsigned long addr, unsigned long *g2); /* Uh, these should become 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. */ #define put_user(x, ptr) ({ \ unsigned long __pu_addr = (unsigned long)(ptr); \ __chk_user_ptr(ptr); \ __put_user_check((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr))); \ }) #define get_user(x, ptr) ({ \ unsigned long __gu_addr = (unsigned long)(ptr); \ __chk_user_ptr(ptr); \ __get_user_check((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr))); \ }) /* * The "__xxx" versions do not do address space checking, useful when * doing multiple accesses to the same area (the user 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)), __typeof__(*(ptr))) struct __large_struct { unsigned long buf[100]; }; #define __m(x) ((struct __large_struct __user *)(x)) #define __put_user_check(x, addr, size) ({ \ register int __pu_ret; \ if (__access_ok(addr, size)) { \ switch (size) { \ case 1: \ __put_user_asm(x, b, addr, __pu_ret); \ break; \ case 2: \ __put_user_asm(x, h, addr, __pu_ret); \ break; \ case 4: \ __put_user_asm(x, , addr, __pu_ret); \ break; \ case 8: \ __put_user_asm(x, d, addr, __pu_ret); \ break; \ default: \ __pu_ret = __put_user_bad(); \ break; \ } \ } else { \ __pu_ret = -EFAULT; \ } \ __pu_ret; \ }) #define __put_user_nocheck(x, addr, size) ({ \ register int __pu_ret; \ switch (size) { \ case 1: __put_user_asm(x, b, addr, __pu_ret); break; \ case 2: __put_user_asm(x, h, addr, __pu_ret); break; \ case 4: __put_user_asm(x, , addr, __pu_ret); break; \ case 8: __put_user_asm(x, d, addr, __pu_ret); break; \ default: __pu_ret = __put_user_bad(); break; \ } \ __pu_ret; \ }) #define __put_user_asm(x, size, addr, ret) \ __asm__ __volatile__( \ "/* Put user asm, inline. */\n" \ "1:\t" "st"#size " %1, %2\n\t" \ "clr %0\n" \ "2:\n\n\t" \ ".section .fixup,#alloc,#execinstr\n\t" \ ".align 4\n" \ "3:\n\t" \ "b 2b\n\t" \ " mov %3, %0\n\t" \ ".previous\n\n\t" \ ".section __ex_table,#alloc\n\t" \ ".align 4\n\t" \ ".word 1b, 3b\n\t" \ ".previous\n\n\t" \ : "=&r" (ret) : "r" (x), "m" (*__m(addr)), \ "i" (-EFAULT)) int __put_user_bad(void); #define __get_user_check(x, addr, size, type) ({ \ register int __gu_ret; \ register unsigned long __gu_val; \ if (__access_ok(addr, size)) { \ switch (size) { \ case 1: \ __get_user_asm(__gu_val, ub, addr, __gu_ret); \ break; \ case 2: \ __get_user_asm(__gu_val, uh, addr, __gu_ret); \ break; \ case 4: \ __get_user_asm(__gu_val, , addr, __gu_ret); \ break; \ case 8: \ __get_user_asm(__gu_val, d, addr, __gu_ret); \ break; \ default: \ __gu_val = 0; \ __gu_ret = __get_user_bad(); \ break; \ } \ } else { \ __gu_val = 0; \ __gu_ret = -EFAULT; \ } \ x = (__force type) __gu_val; \ __gu_ret; \ }) #define __get_user_nocheck(x, addr, size, type) ({ \ register int __gu_ret; \ register unsigned long __gu_val; \ switch (size) { \ case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \ case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \ case 4: __get_user_asm(__gu_val, , addr, __gu_ret); break; \ case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break; \ default: \ __gu_val = 0; \ __gu_ret = __get_user_bad(); \ break; \ } \ x = (__force type) __gu_val; \ __gu_ret; \ }) #define __get_user_asm(x, size, addr, ret) \ __asm__ __volatile__( \ "/* Get user asm, inline. */\n" \ "1:\t" "ld"#size " %2, %1\n\t" \ "clr %0\n" \ "2:\n\n\t" \ ".section .fixup,#alloc,#execinstr\n\t" \ ".align 4\n" \ "3:\n\t" \ "clr %1\n\t" \ "b 2b\n\t" \ " mov %3, %0\n\n\t" \ ".previous\n\t" \ ".section __ex_table,#alloc\n\t" \ ".align 4\n\t" \ ".word 1b, 3b\n\n\t" \ ".previous\n\t" \ : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)), \ "i" (-EFAULT)) int __get_user_bad(void); unsigned long __copy_user(void __user *to, const void __user *from, unsigned long size); static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n) { return __copy_user(to, (__force void __user *) from, n); } static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) { return __copy_user((__force void __user *) to, from, n); } #define INLINE_COPY_FROM_USER #define INLINE_COPY_TO_USER static inline unsigned long __clear_user(void __user *addr, unsigned long size) { unsigned long ret; __asm__ __volatile__ ( ".section __ex_table,#alloc\n\t" ".align 4\n\t" ".word 1f,3\n\t" ".previous\n\t" "mov %2, %%o1\n" "1:\n\t" "call __bzero\n\t" " mov %1, %%o0\n\t" "mov %%o0, %0\n" : "=r" (ret) : "r" (addr), "r" (size) : "o0", "o1", "o2", "o3", "o4", "o5", "o7", "g1", "g2", "g3", "g4", "g5", "g7", "cc"); return ret; } static inline unsigned long clear_user(void __user *addr, unsigned long n) { if (n && __access_ok((unsigned long) addr, n)) return __clear_user(addr, n); else return n; } __must_check long strnlen_user(const char __user *str, long n); #endif /* _ASM_UACCESS_H */
Name | Type | Size | Permission | Actions |
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Kbuild | File | 491 B | 0644 |
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agp.h | File | 434 B | 0644 |
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apb.h | File | 1.06 KB | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asm-prototypes.h | File | 727 B | 0644 |
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asm.h | File | 1.08 KB | 0644 |
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asmmacro.h | File | 1.16 KB | 0644 |
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atomic.h | File | 219 B | 0644 |
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atomic_32.h | File | 2.26 KB | 0644 |
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atomic_64.h | File | 3.34 KB | 0644 |
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auxio.h | File | 310 B | 0644 |
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auxio_32.h | File | 2.55 KB | 0644 |
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auxio_64.h | File | 3.18 KB | 0644 |
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backoff.h | File | 2.7 KB | 0644 |
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barrier.h | File | 223 B | 0644 |
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barrier_32.h | File | 160 B | 0644 |
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barrier_64.h | File | 1.96 KB | 0644 |
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bbc.h | File | 9.76 KB | 0644 |
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bitext.h | File | 631 B | 0644 |
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bitops.h | File | 219 B | 0644 |
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bitops_32.h | File | 2.79 KB | 0644 |
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bitops_64.h | File | 1.64 KB | 0644 |
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btext.h | File | 145 B | 0644 |
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bug.h | File | 588 B | 0644 |
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bugs.h | File | 404 B | 0644 |
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cache.h | File | 649 B | 0644 |
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cacheflush.h | File | 373 B | 0644 |
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cacheflush_32.h | File | 1.97 KB | 0644 |
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cacheflush_64.h | File | 2.56 KB | 0644 |
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cachetlb_32.h | File | 882 B | 0644 |
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chafsr.h | File | 9.48 KB | 0644 |
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checksum.h | File | 227 B | 0644 |
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checksum_32.h | File | 6.81 KB | 0644 |
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checksum_64.h | File | 4.4 KB | 0644 |
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chmctrl.h | File | 7.91 KB | 0644 |
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clock.h | File | 231 B | 0644 |
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clocksource.h | File | 407 B | 0644 |
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cmpxchg.h | File | 223 B | 0644 |
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cmpxchg_32.h | File | 2.4 KB | 0644 |
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cmpxchg_64.h | File | 5.13 KB | 0644 |
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compat.h | File | 6.45 KB | 0644 |
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compat_signal.h | File | 565 B | 0644 |
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contregs.h | File | 1.9 KB | 0644 |
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cpu_type.h | File | 579 B | 0644 |
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cpudata.h | File | 378 B | 0644 |
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cpudata_32.h | File | 729 B | 0644 |
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cpudata_64.h | File | 1.13 KB | 0644 |
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current.h | File | 991 B | 0644 |
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dcr.h | File | 728 B | 0644 |
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dcu.h | File | 1.48 KB | 0644 |
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delay.h | File | 215 B | 0644 |
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delay_32.h | File | 907 B | 0644 |
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delay_64.h | File | 403 B | 0644 |
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device.h | File | 565 B | 0644 |
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dma-mapping.h | File | 632 B | 0644 |
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dma.h | File | 6.6 KB | 0644 |
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ebus_dma.h | File | 1.07 KB | 0644 |
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ecc.h | File | 4.34 KB | 0644 |
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eeprom.h | File | 254 B | 0644 |
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elf.h | File | 207 B | 0644 |
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elf_32.h | File | 3.19 KB | 0644 |
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elf_64.h | File | 6.47 KB | 0644 |
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estate.h | File | 2.23 KB | 0644 |
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extable_64.h | File | 727 B | 0644 |
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fb.h | File | 680 B | 0644 |
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fbio.h | File | 2.26 KB | 0644 |
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fhc.h | File | 4.43 KB | 0644 |
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floppy.h | File | 219 B | 0644 |
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floppy_32.h | File | 9.74 KB | 0644 |
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floppy_64.h | File | 18.83 KB | 0644 |
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fpumacro.h | File | 710 B | 0644 |
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ftrace.h | File | 800 B | 0644 |
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futex.h | File | 215 B | 0644 |
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futex_32.h | File | 82 B | 0644 |
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futex_64.h | File | 2.15 KB | 0644 |
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hardirq.h | File | 223 B | 0644 |
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hardirq_32.h | File | 334 B | 0644 |
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hardirq_64.h | File | 417 B | 0644 |
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head.h | File | 211 B | 0644 |
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head_32.h | File | 2.56 KB | 0644 |
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head_64.h | File | 2.13 KB | 0644 |
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hibernate.h | File | 421 B | 0644 |
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highmem.h | File | 2.02 KB | 0644 |
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hugetlb.h | File | 2.09 KB | 0644 |
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hvtramp.h | File | 782 B | 0644 |
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hw_irq.h | File | 88 B | 0644 |
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hypervisor.h | File | 110.71 KB | 0644 |
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ide.h | File | 2.19 KB | 0644 |
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idprom.h | File | 656 B | 0644 |
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intr_queue.h | File | 794 B | 0644 |
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io-unit.h | File | 2.41 KB | 0644 |
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io.h | File | 620 B | 0644 |
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io_32.h | File | 3.51 KB | 0644 |
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io_64.h | File | 10.66 KB | 0644 |
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ioctls.h | File | 358 B | 0644 |
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iommu.h | File | 215 B | 0644 |
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iommu_32.h | File | 5.73 KB | 0644 |
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iommu_64.h | File | 2.43 KB | 0644 |
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irq.h | File | 207 B | 0644 |
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irq_32.h | File | 526 B | 0644 |
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irq_64.h | File | 3.06 KB | 0644 |
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irqflags.h | File | 227 B | 0644 |
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irqflags_32.h | File | 1.03 KB | 0644 |
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irqflags_64.h | File | 1.91 KB | 0644 |
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jump_label.h | File | 1.01 KB | 0644 |
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kdebug.h | File | 219 B | 0644 |
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kdebug_32.h | File | 1.99 KB | 0644 |
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kdebug_64.h | File | 393 B | 0644 |
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kgdb.h | File | 1014 B | 0644 |
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kmap_types.h | File | 233 B | 0644 |
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kprobes.h | File | 1.41 KB | 0644 |
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ldc.h | File | 4.37 KB | 0644 |
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leon.h | File | 7.37 KB | 0644 |
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leon_amba.h | File | 8.09 KB | 0644 |
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leon_pci.h | File | 512 B | 0644 |
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lsu.h | File | 1.04 KB | 0644 |
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machines.h | File | 1.5 KB | 0644 |
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mbus.h | File | 2.93 KB | 0644 |
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mc146818rtc.h | File | 298 B | 0644 |
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mc146818rtc_32.h | File | 699 B | 0644 |
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mc146818rtc_64.h | File | 689 B | 0644 |
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mdesc.h | File | 2.99 KB | 0644 |
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memctrl.h | File | 311 B | 0644 |
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mman.h | File | 304 B | 0644 |
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mmu.h | File | 207 B | 0644 |
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mmu_32.h | File | 209 B | 0644 |
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mmu_64.h | File | 3.14 KB | 0644 |
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mmu_context.h | File | 239 B | 0644 |
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mmu_context_32.h | File | 1.07 KB | 0644 |
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mmu_context_64.h | File | 4.15 KB | 0644 |
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mmzone.h | File | 393 B | 0644 |
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msi.h | File | 774 B | 0644 |
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mxcc.h | File | 4.33 KB | 0644 |
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nmi.h | File | 354 B | 0644 |
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ns87303.h | File | 3.22 KB | 0644 |
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obio.h | File | 6.26 KB | 0644 |
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openprom.h | File | 7.3 KB | 0644 |
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oplib.h | File | 215 B | 0644 |
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oplib_32.h | File | 5.92 KB | 0644 |
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oplib_64.h | File | 8.12 KB | 0644 |
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page.h | File | 274 B | 0644 |
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page_32.h | File | 3.91 KB | 0644 |
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page_64.h | File | 4.49 KB | 0644 |
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parport.h | File | 5.68 KB | 0644 |
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pbm.h | File | 1.47 KB | 0644 |
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pci.h | File | 207 B | 0644 |
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pci_32.h | File | 1.09 KB | 0644 |
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pci_64.h | File | 1.49 KB | 0644 |
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pcic.h | File | 5.77 KB | 0644 |
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pcr.h | File | 1.85 KB | 0644 |
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percpu.h | File | 219 B | 0644 |
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percpu_32.h | File | 168 B | 0644 |
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percpu_64.h | File | 515 B | 0644 |
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perf_event.h | File | 802 B | 0644 |
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pgalloc.h | File | 223 B | 0644 |
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pgalloc_32.h | File | 1.91 KB | 0644 |
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pgalloc_64.h | File | 2.85 KB | 0644 |
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pgtable.h | File | 223 B | 0644 |
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pgtable_32.h | File | 11.35 KB | 0644 |
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pgtable_64.h | File | 30.71 KB | 0644 |
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pgtsrmmu.h | File | 6.05 KB | 0644 |
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pil.h | File | 1.08 KB | 0644 |
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processor.h | File | 231 B | 0644 |
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processor_32.h | File | 3.13 KB | 0644 |
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processor_64.h | File | 7.58 KB | 0644 |
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prom.h | File | 2.02 KB | 0644 |
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psr.h | File | 1.38 KB | 0644 |
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ptrace.h | File | 4.19 KB | 0644 |
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qrwlock.h | File | 205 B | 0644 |
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qspinlock.h | File | 215 B | 0644 |
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ross.h | File | 5.52 KB | 0644 |
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sbi.h | File | 3.34 KB | 0644 |
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scratchpad.h | File | 547 B | 0644 |
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seccomp.h | File | 225 B | 0644 |
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sections.h | File | 289 B | 0644 |
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setup.h | File | 1.52 KB | 0644 |
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sfafsr.h | File | 3.14 KB | 0644 |
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sfp-machine.h | File | 239 B | 0644 |
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sfp-machine_32.h | File | 6.79 KB | 0644 |
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sfp-machine_64.h | File | 3.1 KB | 0644 |
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shmparam.h | File | 227 B | 0644 |
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shmparam_32.h | File | 253 B | 0644 |
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shmparam_64.h | File | 306 B | 0644 |
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sigcontext.h | File | 2.55 KB | 0644 |
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signal.h | File | 835 B | 0644 |
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smp.h | File | 207 B | 0644 |
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smp_32.h | File | 3.29 KB | 0644 |
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smp_64.h | File | 1.84 KB | 0644 |
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sparsemem.h | File | 349 B | 0644 |
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spinlock.h | File | 227 B | 0644 |
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spinlock_32.h | File | 4.22 KB | 0644 |
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spinlock_64.h | File | 409 B | 0644 |
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spinlock_types.h | File | 549 B | 0644 |
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spitfire.h | File | 9.73 KB | 0644 |
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stacktrace.h | File | 166 B | 0644 |
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starfire.h | File | 418 B | 0644 |
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string.h | File | 1.13 KB | 0644 |
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string_32.h | File | 405 B | 0644 |
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string_64.h | File | 505 B | 0644 |
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sunbpp.h | File | 3.27 KB | 0644 |
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swift.h | File | 3.07 KB | 0644 |
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switch_to.h | File | 231 B | 0644 |
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switch_to_32.h | File | 3.53 KB | 0644 |
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switch_to_64.h | File | 2.58 KB | 0644 |
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syscall.h | File | 3.41 KB | 0644 |
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syscalls.h | File | 307 B | 0644 |
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termbits.h | File | 198 B | 0644 |
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termios.h | File | 4.94 KB | 0644 |
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thread_info.h | File | 239 B | 0644 |
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thread_info_32.h | File | 3.66 KB | 0644 |
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thread_info_64.h | File | 7.84 KB | 0644 |
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timer.h | File | 215 B | 0644 |
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timer_32.h | File | 1.18 KB | 0644 |
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timer_64.h | File | 2.37 KB | 0644 |
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timex.h | File | 215 B | 0644 |
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timex_32.h | File | 266 B | 0644 |
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timex_64.h | File | 423 B | 0644 |
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tlb.h | File | 207 B | 0644 |
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tlb_32.h | File | 520 B | 0644 |
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tlb_64.h | File | 913 B | 0644 |
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tlbflush.h | File | 227 B | 0644 |
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tlbflush_32.h | File | 621 B | 0644 |
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tlbflush_64.h | File | 1.73 KB | 0644 |
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topology.h | File | 227 B | 0644 |
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topology_32.h | File | 170 B | 0644 |
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topology_64.h | File | 1.51 KB | 0644 |
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trap_block.h | File | 6.51 KB | 0644 |
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traps.h | File | 577 B | 0644 |
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tsb.h | File | 12.17 KB | 0644 |
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tsunami.h | File | 1.85 KB | 0644 |
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ttable.h | File | 20.08 KB | 0644 |
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turbosparc.h | File | 3.78 KB | 0644 |
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uaccess.h | File | 363 B | 0644 |
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uaccess_32.h | File | 8.31 KB | 0644 |
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uaccess_64.h | File | 6.05 KB | 0644 |
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unaligned.h | File | 339 B | 0644 |
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unistd.h | File | 1.37 KB | 0644 |
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upa.h | File | 3.72 KB | 0644 |
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uprobes.h | File | 1.86 KB | 0644 |
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user.h | File | 102 B | 0644 |
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vaddrs.h | File | 2.02 KB | 0644 |
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vdso.h | File | 662 B | 0644 |
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vga.h | File | 964 B | 0644 |
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viking.h | File | 8.14 KB | 0644 |
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vio.h | File | 11.81 KB | 0644 |
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visasm.h | File | 1.51 KB | 0644 |
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vvar.h | File | 1.52 KB | 0644 |
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winmacro.h | File | 4.66 KB | 0644 |
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xor.h | File | 207 B | 0644 |
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xor_32.h | File | 7.31 KB | 0644 |
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xor_64.h | File | 2.5 KB | 0644 |
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