/* uaccess.h: userspace accessor functions * * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _ASM_UACCESS_H #define _ASM_UACCESS_H /* * User space memory access functions */ #include <linux/mm.h> #include <asm/segment.h> #include <asm/sections.h> #include <asm/extable.h> #define __ptr(x) ((unsigned long __force *)(x)) /* * check that a range of addresses falls within the current address limit */ static inline int ___range_ok(unsigned long addr, unsigned long size) { #ifdef CONFIG_MMU int flag = -EFAULT, tmp; asm volatile ( " addcc %3,%2,%1,icc0 \n" /* set C-flag if addr+size>4GB */ " subcc.p %1,%4,gr0,icc1 \n" /* jump if addr+size>limit */ " bc icc0,#0,0f \n" " bhi icc1,#0,0f \n" " setlos #0,%0 \n" /* mark okay */ "0: \n" : "=r"(flag), "=&r"(tmp) : "r"(addr), "r"(size), "r"(get_addr_limit()), "0"(flag) ); return flag; #else if (addr < memory_start || addr > memory_end || size > memory_end - memory_start || addr + size > memory_end) return -EFAULT; return 0; #endif } #define __range_ok(addr,size) ___range_ok((unsigned long) (addr), (unsigned long) (size)) #define access_ok(type,addr,size) (__range_ok((void __user *)(addr), (size)) == 0) #define __access_ok(addr,size) (__range_ok((addr), (size)) == 0) /* * 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) \ ({ \ int __pu_err = 0; \ \ typeof(*(ptr)) __pu_val = (x); \ __chk_user_ptr(ptr); \ \ switch (sizeof (*(ptr))) { \ case 1: \ __put_user_asm(__pu_err, __pu_val, ptr, "b", "r"); \ break; \ case 2: \ __put_user_asm(__pu_err, __pu_val, ptr, "h", "r"); \ break; \ case 4: \ __put_user_asm(__pu_err, __pu_val, ptr, "", "r"); \ break; \ case 8: \ __put_user_asm(__pu_err, __pu_val, ptr, "d", "e"); \ break; \ default: \ __pu_err = __put_user_bad(); \ break; \ } \ __pu_err; \ }) #define put_user(x, ptr) \ ({ \ typeof(*(ptr)) __user *_p = (ptr); \ int _e; \ \ _e = __range_ok(_p, sizeof(*_p)); \ if (_e == 0) \ _e = __put_user((x), _p); \ _e; \ }) extern int __put_user_bad(void); /* * Tell gcc we read from memory instead of writing: this is because * we do not write to any memory gcc knows about, so there are no * aliasing issues. */ #ifdef CONFIG_MMU #define __put_user_asm(err,x,ptr,dsize,constraint) \ do { \ asm volatile("1: st"dsize"%I1 %2,%M1 \n" \ "2: \n" \ ".subsection 2 \n" \ "3: setlos %3,%0 \n" \ " bra 2b \n" \ ".previous \n" \ ".section __ex_table,\"a\" \n" \ " .balign 8 \n" \ " .long 1b,3b \n" \ ".previous" \ : "=r" (err) \ : "m" (*__ptr(ptr)), constraint (x), "i"(-EFAULT), "0"(err) \ : "memory"); \ } while (0) #else #define __put_user_asm(err,x,ptr,bwl,con) \ do { \ asm(" st"bwl"%I0 %1,%M0 \n" \ " membar \n" \ : \ : "m" (*__ptr(ptr)), con (x) \ : "memory"); \ } while (0) #endif /*****************************************************************************/ /* * */ #define __get_user(x, ptr) \ ({ \ int __gu_err = 0; \ __chk_user_ptr(ptr); \ \ switch (sizeof(*(ptr))) { \ case 1: { \ unsigned char __gu_val; \ __get_user_asm(__gu_err, __gu_val, ptr, "ub", "=r"); \ (x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \ break; \ } \ case 2: { \ unsigned short __gu_val; \ __get_user_asm(__gu_err, __gu_val, ptr, "uh", "=r"); \ (x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \ break; \ } \ case 4: { \ unsigned int __gu_val; \ __get_user_asm(__gu_err, __gu_val, ptr, "", "=r"); \ (x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \ break; \ } \ case 8: { \ unsigned long long __gu_val; \ __get_user_asm(__gu_err, __gu_val, ptr, "d", "=e"); \ (x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \ break; \ } \ default: \ __gu_err = __get_user_bad(); \ break; \ } \ __gu_err; \ }) #define get_user(x, ptr) \ ({ \ const typeof(*(ptr)) __user *_p = (ptr);\ int _e; \ \ _e = __range_ok(_p, sizeof(*_p)); \ if (likely(_e == 0)) \ _e = __get_user((x), _p); \ else \ (x) = (typeof(x)) 0; \ _e; \ }) extern int __get_user_bad(void); #ifdef CONFIG_MMU #define __get_user_asm(err,x,ptr,dtype,constraint) \ do { \ asm("1: ld"dtype"%I2 %M2,%1 \n" \ "2: \n" \ ".subsection 2 \n" \ "3: setlos %3,%0 \n" \ " setlos #0,%1 \n" \ " bra 2b \n" \ ".previous \n" \ ".section __ex_table,\"a\" \n" \ " .balign 8 \n" \ " .long 1b,3b \n" \ ".previous" \ : "=r" (err), constraint (x) \ : "m" (*__ptr(ptr)), "i"(-EFAULT), "0"(err) \ ); \ } while(0) #else #define __get_user_asm(err,x,ptr,bwl,con) \ asm(" ld"bwl"%I1 %M1,%0 \n" \ " membar \n" \ : con(x) \ : "m" (*__ptr(ptr))) #endif /*****************************************************************************/ /* * */ #define ____force(x) (__force void *)(void __user *)(x) #ifdef CONFIG_MMU extern long __memset_user(void *dst, unsigned long count); extern long __memcpy_user(void *dst, const void *src, unsigned long count); #define __clear_user(dst,count) __memset_user(____force(dst), (count)) #else #define __clear_user(dst,count) (memset(____force(dst), 0, (count)), 0) #endif static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) { #ifdef CONFIG_MMU return __memcpy_user(to, (__force const void *)from, n); #else memcpy(to, (__force const void *)from, n); return 0; #endif } static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n) { #ifdef CONFIG_MMU return __memcpy_user((__force void *)to, from, n); #else memcpy((__force void *)to, from, n); return 0; #endif } #define INLINE_COPY_TO_USER #define INLINE_COPY_FROM_USER static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) { if (likely(__access_ok(to, n))) n = __clear_user(to, n); return n; } extern long strncpy_from_user(char *dst, const char __user *src, long count); extern long strnlen_user(const char __user *src, long count); #endif /* _ASM_UACCESS_H */
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Kbuild | File | 290 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 4.97 KB | 0644 |
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atomic_defs.h | File | 4.66 KB | 0644 |
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ax88796.h | File | 751 B | 0644 |
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barrier.h | File | 720 B | 0644 |
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bitops.h | File | 7.12 KB | 0644 |
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bug.h | File | 1.36 KB | 0644 |
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bugs.h | File | 445 B | 0644 |
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busctl-regs.h | File | 2.02 KB | 0644 |
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cache.h | File | 727 B | 0644 |
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cacheflush.h | File | 3.05 KB | 0644 |
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checksum.h | File | 4.53 KB | 0644 |
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cmpxchg.h | File | 4.56 KB | 0644 |
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cpu-irqs.h | File | 2.59 KB | 0644 |
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current.h | File | 685 B | 0644 |
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delay.h | File | 1.28 KB | 0644 |
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div64.h | File | 31 B | 0644 |
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dm9000.h | File | 1.12 KB | 0644 |
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dma-mapping.h | File | 448 B | 0644 |
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dma.h | File | 3.63 KB | 0644 |
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elf.h | File | 5.18 KB | 0644 |
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emergency-restart.h | File | 149 B | 0644 |
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fpu.h | File | 261 B | 0644 |
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ftrace.h | File | 12 B | 0644 |
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futex.h | File | 416 B | 0644 |
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gdb-stub.h | File | 4.47 KB | 0644 |
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gpio-regs.h | File | 3.64 KB | 0644 |
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hardirq.h | File | 666 B | 0644 |
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highmem.h | File | 4.09 KB | 0644 |
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hw_irq.h | File | 484 B | 0644 |
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io.h | File | 9.75 KB | 0644 |
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irc-regs.h | File | 1.78 KB | 0644 |
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irq.h | File | 760 B | 0644 |
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irq_regs.h | File | 764 B | 0644 |
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irqflags.h | File | 3.71 KB | 0644 |
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kdebug.h | File | 32 B | 0644 |
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kmap_types.h | File | 123 B | 0644 |
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linkage.h | File | 114 B | 0644 |
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local.h | File | 140 B | 0644 |
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local64.h | File | 33 B | 0644 |
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math-emu.h | File | 6.38 KB | 0644 |
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mb-regs.h | File | 6.94 KB | 0644 |
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mb86943a.h | File | 1.84 KB | 0644 |
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mb93091-fpga-irqs.h | File | 1.06 KB | 0644 |
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mb93093-fpga-irqs.h | File | 789 B | 0644 |
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mb93493-irqs.h | File | 1.69 KB | 0644 |
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mb93493-regs.h | File | 12.46 KB | 0644 |
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mem-layout.h | File | 2.21 KB | 0644 |
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mmu.h | File | 1.26 KB | 0644 |
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mmu_context.h | File | 1.38 KB | 0644 |
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module.h | File | 617 B | 0644 |
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page.h | File | 2.08 KB | 0644 |
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pci.h | File | 1.23 KB | 0644 |
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percpu.h | File | 147 B | 0644 |
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perf_event.h | File | 487 B | 0644 |
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pgalloc.h | File | 1.87 KB | 0644 |
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pgtable.h | File | 16.02 KB | 0644 |
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processor.h | File | 2.85 KB | 0644 |
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ptrace.h | File | 1.2 KB | 0644 |
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sections.h | File | 1.1 KB | 0644 |
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segment.h | File | 1.08 KB | 0644 |
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serial-regs.h | File | 1.63 KB | 0644 |
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serial.h | File | 308 B | 0644 |
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setup.h | File | 641 B | 0644 |
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shmparam.h | File | 183 B | 0644 |
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signal.h | File | 141 B | 0644 |
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smp.h | File | 139 B | 0644 |
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spinlock.h | File | 516 B | 0644 |
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spr-regs.h | File | 17.93 KB | 0644 |
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string.h | File | 1.36 KB | 0644 |
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switch_to.h | File | 1.07 KB | 0644 |
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syscall.h | File | 2.73 KB | 0644 |
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termios.h | File | 425 B | 0644 |
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thread_info.h | File | 3.48 KB | 0644 |
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timer-regs.h | File | 3.63 KB | 0644 |
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timex.h | File | 720 B | 0644 |
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tlb.h | File | 615 B | 0644 |
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tlbflush.h | File | 1.88 KB | 0644 |
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topology.h | File | 229 B | 0644 |
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types.h | File | 595 B | 0644 |
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uaccess.h | File | 6.79 KB | 0644 |
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ucontext.h | File | 281 B | 0644 |
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unaligned.h | File | 694 B | 0644 |
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unistd.h | File | 928 B | 0644 |
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user.h | File | 3.29 KB | 0644 |
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vga.h | File | 464 B | 0644 |
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virtconvert.h | File | 1.09 KB | 0644 |
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xor.h | File | 29 B | 0644 |
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