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359 lines
10 KiB
359 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* User address space access functions. |
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* The non inlined parts of asm-i386/uaccess.h are here. |
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* |
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* Copyright 1997 Andi Kleen <[email protected]> |
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* Copyright 1997 Linus Torvalds |
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*/ |
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#include <linux/export.h> |
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#include <linux/uaccess.h> |
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#include <asm/mmx.h> |
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#include <asm/asm.h> |
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#ifdef CONFIG_X86_INTEL_USERCOPY |
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/* |
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* Alignment at which movsl is preferred for bulk memory copies. |
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*/ |
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struct movsl_mask movsl_mask __read_mostly; |
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#endif |
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static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n) |
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{ |
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#ifdef CONFIG_X86_INTEL_USERCOPY |
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if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask)) |
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return 0; |
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#endif |
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return 1; |
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} |
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#define movsl_is_ok(a1, a2, n) \ |
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__movsl_is_ok((unsigned long)(a1), (unsigned long)(a2), (n)) |
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/* |
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* Zero Userspace |
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*/ |
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#define __do_clear_user(addr,size) \ |
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do { \ |
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int __d0; \ |
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might_fault(); \ |
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__asm__ __volatile__( \ |
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ASM_STAC "\n" \ |
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"0: rep; stosl\n" \ |
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" movl %2,%0\n" \ |
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"1: rep; stosb\n" \ |
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"2: " ASM_CLAC "\n" \ |
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".section .fixup,\"ax\"\n" \ |
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"3: lea 0(%2,%0,4),%0\n" \ |
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" jmp 2b\n" \ |
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".previous\n" \ |
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_ASM_EXTABLE_UA(0b, 3b) \ |
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_ASM_EXTABLE_UA(1b, 2b) \ |
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: "=&c"(size), "=&D" (__d0) \ |
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: "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \ |
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} while (0) |
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/** |
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* clear_user - Zero a block of memory in user space. |
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* @to: Destination address, in user space. |
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* @n: Number of bytes to zero. |
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* |
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* Zero a block of memory in user space. |
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* |
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* Return: number of bytes that could not be cleared. |
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* On success, this will be zero. |
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*/ |
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unsigned long |
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clear_user(void __user *to, unsigned long n) |
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{ |
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might_fault(); |
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if (access_ok(to, n)) |
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__do_clear_user(to, n); |
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return n; |
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} |
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EXPORT_SYMBOL(clear_user); |
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/** |
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* __clear_user - Zero a block of memory in user space, with less checking. |
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* @to: Destination address, in user space. |
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* @n: Number of bytes to zero. |
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* |
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* Zero a block of memory in user space. Caller must check |
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* the specified block with access_ok() before calling this function. |
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* |
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* Return: number of bytes that could not be cleared. |
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* On success, this will be zero. |
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*/ |
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unsigned long |
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__clear_user(void __user *to, unsigned long n) |
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{ |
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__do_clear_user(to, n); |
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return n; |
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} |
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EXPORT_SYMBOL(__clear_user); |
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#ifdef CONFIG_X86_INTEL_USERCOPY |
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static unsigned long |
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__copy_user_intel(void __user *to, const void *from, unsigned long size) |
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{ |
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int d0, d1; |
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__asm__ __volatile__( |
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" .align 2,0x90\n" |
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"1: movl 32(%4), %%eax\n" |
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" cmpl $67, %0\n" |
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" jbe 3f\n" |
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"2: movl 64(%4), %%eax\n" |
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" .align 2,0x90\n" |
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"3: movl 0(%4), %%eax\n" |
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"4: movl 4(%4), %%edx\n" |
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"5: movl %%eax, 0(%3)\n" |
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"6: movl %%edx, 4(%3)\n" |
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"7: movl 8(%4), %%eax\n" |
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"8: movl 12(%4),%%edx\n" |
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"9: movl %%eax, 8(%3)\n" |
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"10: movl %%edx, 12(%3)\n" |
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"11: movl 16(%4), %%eax\n" |
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"12: movl 20(%4), %%edx\n" |
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"13: movl %%eax, 16(%3)\n" |
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"14: movl %%edx, 20(%3)\n" |
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"15: movl 24(%4), %%eax\n" |
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"16: movl 28(%4), %%edx\n" |
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"17: movl %%eax, 24(%3)\n" |
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"18: movl %%edx, 28(%3)\n" |
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"19: movl 32(%4), %%eax\n" |
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"20: movl 36(%4), %%edx\n" |
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"21: movl %%eax, 32(%3)\n" |
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"22: movl %%edx, 36(%3)\n" |
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"23: movl 40(%4), %%eax\n" |
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"24: movl 44(%4), %%edx\n" |
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"25: movl %%eax, 40(%3)\n" |
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"26: movl %%edx, 44(%3)\n" |
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"27: movl 48(%4), %%eax\n" |
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"28: movl 52(%4), %%edx\n" |
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"29: movl %%eax, 48(%3)\n" |
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"30: movl %%edx, 52(%3)\n" |
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"31: movl 56(%4), %%eax\n" |
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"32: movl 60(%4), %%edx\n" |
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"33: movl %%eax, 56(%3)\n" |
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"34: movl %%edx, 60(%3)\n" |
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" addl $-64, %0\n" |
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" addl $64, %4\n" |
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" addl $64, %3\n" |
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" cmpl $63, %0\n" |
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" ja 1b\n" |
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"35: movl %0, %%eax\n" |
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" shrl $2, %0\n" |
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" andl $3, %%eax\n" |
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" cld\n" |
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"99: rep; movsl\n" |
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"36: movl %%eax, %0\n" |
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"37: rep; movsb\n" |
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"100:\n" |
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".section .fixup,\"ax\"\n" |
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"101: lea 0(%%eax,%0,4),%0\n" |
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" jmp 100b\n" |
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".previous\n" |
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_ASM_EXTABLE_UA(1b, 100b) |
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_ASM_EXTABLE_UA(2b, 100b) |
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_ASM_EXTABLE_UA(3b, 100b) |
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_ASM_EXTABLE_UA(4b, 100b) |
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_ASM_EXTABLE_UA(5b, 100b) |
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_ASM_EXTABLE_UA(6b, 100b) |
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_ASM_EXTABLE_UA(7b, 100b) |
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_ASM_EXTABLE_UA(8b, 100b) |
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_ASM_EXTABLE_UA(9b, 100b) |
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_ASM_EXTABLE_UA(10b, 100b) |
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_ASM_EXTABLE_UA(11b, 100b) |
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_ASM_EXTABLE_UA(12b, 100b) |
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_ASM_EXTABLE_UA(13b, 100b) |
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_ASM_EXTABLE_UA(14b, 100b) |
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_ASM_EXTABLE_UA(15b, 100b) |
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_ASM_EXTABLE_UA(16b, 100b) |
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_ASM_EXTABLE_UA(17b, 100b) |
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_ASM_EXTABLE_UA(18b, 100b) |
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_ASM_EXTABLE_UA(19b, 100b) |
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_ASM_EXTABLE_UA(20b, 100b) |
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_ASM_EXTABLE_UA(21b, 100b) |
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_ASM_EXTABLE_UA(22b, 100b) |
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_ASM_EXTABLE_UA(23b, 100b) |
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_ASM_EXTABLE_UA(24b, 100b) |
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_ASM_EXTABLE_UA(25b, 100b) |
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_ASM_EXTABLE_UA(26b, 100b) |
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_ASM_EXTABLE_UA(27b, 100b) |
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_ASM_EXTABLE_UA(28b, 100b) |
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_ASM_EXTABLE_UA(29b, 100b) |
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_ASM_EXTABLE_UA(30b, 100b) |
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_ASM_EXTABLE_UA(31b, 100b) |
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_ASM_EXTABLE_UA(32b, 100b) |
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_ASM_EXTABLE_UA(33b, 100b) |
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_ASM_EXTABLE_UA(34b, 100b) |
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_ASM_EXTABLE_UA(35b, 100b) |
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_ASM_EXTABLE_UA(36b, 100b) |
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_ASM_EXTABLE_UA(37b, 100b) |
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_ASM_EXTABLE_UA(99b, 101b) |
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: "=&c"(size), "=&D" (d0), "=&S" (d1) |
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: "1"(to), "2"(from), "0"(size) |
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: "eax", "edx", "memory"); |
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return size; |
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} |
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static unsigned long __copy_user_intel_nocache(void *to, |
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const void __user *from, unsigned long size) |
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{ |
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int d0, d1; |
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__asm__ __volatile__( |
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" .align 2,0x90\n" |
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"0: movl 32(%4), %%eax\n" |
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" cmpl $67, %0\n" |
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" jbe 2f\n" |
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"1: movl 64(%4), %%eax\n" |
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" .align 2,0x90\n" |
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"2: movl 0(%4), %%eax\n" |
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"21: movl 4(%4), %%edx\n" |
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" movnti %%eax, 0(%3)\n" |
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" movnti %%edx, 4(%3)\n" |
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"3: movl 8(%4), %%eax\n" |
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"31: movl 12(%4),%%edx\n" |
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" movnti %%eax, 8(%3)\n" |
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" movnti %%edx, 12(%3)\n" |
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"4: movl 16(%4), %%eax\n" |
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"41: movl 20(%4), %%edx\n" |
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" movnti %%eax, 16(%3)\n" |
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" movnti %%edx, 20(%3)\n" |
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"10: movl 24(%4), %%eax\n" |
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"51: movl 28(%4), %%edx\n" |
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" movnti %%eax, 24(%3)\n" |
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" movnti %%edx, 28(%3)\n" |
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"11: movl 32(%4), %%eax\n" |
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"61: movl 36(%4), %%edx\n" |
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" movnti %%eax, 32(%3)\n" |
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" movnti %%edx, 36(%3)\n" |
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"12: movl 40(%4), %%eax\n" |
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"71: movl 44(%4), %%edx\n" |
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" movnti %%eax, 40(%3)\n" |
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" movnti %%edx, 44(%3)\n" |
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"13: movl 48(%4), %%eax\n" |
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"81: movl 52(%4), %%edx\n" |
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" movnti %%eax, 48(%3)\n" |
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" movnti %%edx, 52(%3)\n" |
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"14: movl 56(%4), %%eax\n" |
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"91: movl 60(%4), %%edx\n" |
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" movnti %%eax, 56(%3)\n" |
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" movnti %%edx, 60(%3)\n" |
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" addl $-64, %0\n" |
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" addl $64, %4\n" |
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" addl $64, %3\n" |
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" cmpl $63, %0\n" |
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" ja 0b\n" |
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" sfence \n" |
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"5: movl %0, %%eax\n" |
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" shrl $2, %0\n" |
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" andl $3, %%eax\n" |
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" cld\n" |
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"6: rep; movsl\n" |
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" movl %%eax,%0\n" |
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"7: rep; movsb\n" |
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"8:\n" |
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".section .fixup,\"ax\"\n" |
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"9: lea 0(%%eax,%0,4),%0\n" |
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"16: jmp 8b\n" |
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".previous\n" |
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_ASM_EXTABLE_UA(0b, 16b) |
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_ASM_EXTABLE_UA(1b, 16b) |
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_ASM_EXTABLE_UA(2b, 16b) |
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_ASM_EXTABLE_UA(21b, 16b) |
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_ASM_EXTABLE_UA(3b, 16b) |
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_ASM_EXTABLE_UA(31b, 16b) |
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_ASM_EXTABLE_UA(4b, 16b) |
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_ASM_EXTABLE_UA(41b, 16b) |
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_ASM_EXTABLE_UA(10b, 16b) |
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_ASM_EXTABLE_UA(51b, 16b) |
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_ASM_EXTABLE_UA(11b, 16b) |
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_ASM_EXTABLE_UA(61b, 16b) |
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_ASM_EXTABLE_UA(12b, 16b) |
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_ASM_EXTABLE_UA(71b, 16b) |
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_ASM_EXTABLE_UA(13b, 16b) |
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_ASM_EXTABLE_UA(81b, 16b) |
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_ASM_EXTABLE_UA(14b, 16b) |
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_ASM_EXTABLE_UA(91b, 16b) |
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_ASM_EXTABLE_UA(6b, 9b) |
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_ASM_EXTABLE_UA(7b, 16b) |
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: "=&c"(size), "=&D" (d0), "=&S" (d1) |
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: "1"(to), "2"(from), "0"(size) |
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: "eax", "edx", "memory"); |
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return size; |
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} |
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#else |
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/* |
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* Leave these declared but undefined. They should not be any references to |
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* them |
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*/ |
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unsigned long __copy_user_intel(void __user *to, const void *from, |
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unsigned long size); |
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#endif /* CONFIG_X86_INTEL_USERCOPY */ |
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/* Generic arbitrary sized copy. */ |
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#define __copy_user(to, from, size) \ |
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do { \ |
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int __d0, __d1, __d2; \ |
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__asm__ __volatile__( \ |
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" cmp $7,%0\n" \ |
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" jbe 1f\n" \ |
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" movl %1,%0\n" \ |
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" negl %0\n" \ |
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" andl $7,%0\n" \ |
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" subl %0,%3\n" \ |
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"4: rep; movsb\n" \ |
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" movl %3,%0\n" \ |
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" shrl $2,%0\n" \ |
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" andl $3,%3\n" \ |
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" .align 2,0x90\n" \ |
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"0: rep; movsl\n" \ |
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" movl %3,%0\n" \ |
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"1: rep; movsb\n" \ |
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"2:\n" \ |
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".section .fixup,\"ax\"\n" \ |
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"5: addl %3,%0\n" \ |
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" jmp 2b\n" \ |
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"3: lea 0(%3,%0,4),%0\n" \ |
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" jmp 2b\n" \ |
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".previous\n" \ |
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_ASM_EXTABLE_UA(4b, 5b) \ |
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_ASM_EXTABLE_UA(0b, 3b) \ |
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_ASM_EXTABLE_UA(1b, 2b) \ |
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: "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \ |
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: "3"(size), "0"(size), "1"(to), "2"(from) \ |
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: "memory"); \ |
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} while (0) |
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unsigned long __copy_user_ll(void *to, const void *from, unsigned long n) |
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{ |
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__uaccess_begin_nospec(); |
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if (movsl_is_ok(to, from, n)) |
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__copy_user(to, from, n); |
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else |
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n = __copy_user_intel(to, from, n); |
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__uaccess_end(); |
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return n; |
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} |
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EXPORT_SYMBOL(__copy_user_ll); |
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unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from, |
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unsigned long n) |
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{ |
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__uaccess_begin_nospec(); |
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#ifdef CONFIG_X86_INTEL_USERCOPY |
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if (n > 64 && static_cpu_has(X86_FEATURE_XMM2)) |
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n = __copy_user_intel_nocache(to, from, n); |
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else |
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__copy_user(to, from, n); |
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#else |
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__copy_user(to, from, n); |
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#endif |
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__uaccess_end(); |
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return n; |
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} |
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EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);
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