From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/mips/include/asm/uaccess.h | 564 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 564 insertions(+) create mode 100644 arch/mips/include/asm/uaccess.h (limited to 'arch/mips/include/asm/uaccess.h') diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h new file mode 100644 index 000000000..c0cede273 --- /dev/null +++ b/arch/mips/include/asm/uaccess.h @@ -0,0 +1,564 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + * Copyright (C) 2007 Maciej W. Rozycki + * Copyright (C) 2014, Imagination Technologies Ltd. + */ +#ifndef _ASM_UACCESS_H +#define _ASM_UACCESS_H + +#include +#include +#include +#include + +#ifdef CONFIG_32BIT + +#define __UA_LIMIT 0x80000000UL +#define TASK_SIZE_MAX KSEG0 + +#define __UA_ADDR ".word" +#define __UA_LA "la" +#define __UA_ADDU "addu" +#define __UA_t0 "$8" +#define __UA_t1 "$9" + +#endif /* CONFIG_32BIT */ + +#ifdef CONFIG_64BIT + +extern u64 __ua_limit; + +#define __UA_LIMIT __ua_limit +#define TASK_SIZE_MAX XKSSEG + +#define __UA_ADDR ".dword" +#define __UA_LA "dla" +#define __UA_ADDU "daddu" +#define __UA_t0 "$12" +#define __UA_t1 "$13" + +#endif /* CONFIG_64BIT */ + +#include + +/* + * put_user: - Write a simple value into user space. + * @x: Value to copy to user space. + * @ptr: Destination address, in user space. + * + * Context: User context only. This function may sleep if pagefaults are + * enabled. + * + * This macro copies a single simple value from kernel space to user + * space. It supports simple types like char and int, but not larger + * data types like structures or arrays. + * + * @ptr must have pointer-to-simple-variable type, and @x must be assignable + * to the result of dereferencing @ptr. + * + * Returns zero on success, or -EFAULT on error. + */ +#define put_user(x, ptr) \ +({ \ + __typeof__(*(ptr)) __user *__p = (ptr); \ + \ + might_fault(); \ + access_ok(__p, sizeof(*__p)) ? __put_user((x), __p) : -EFAULT; \ +}) + +/* + * get_user: - Get a simple variable from user space. + * @x: Variable to store result. + * @ptr: Source address, in user space. + * + * Context: User context only. This function may sleep if pagefaults are + * enabled. + * + * This macro copies a single simple variable from user space to kernel + * space. It supports simple types like char and int, but not larger + * data types like structures or arrays. + * + * @ptr must have pointer-to-simple-variable type, and the result of + * dereferencing @ptr must be assignable to @x without a cast. + * + * Returns zero on success, or -EFAULT on error. + * On error, the variable @x is set to zero. + */ +#define get_user(x, ptr) \ +({ \ + const __typeof__(*(ptr)) __user *__p = (ptr); \ + \ + might_fault(); \ + access_ok(__p, sizeof(*__p)) ? __get_user((x), __p) : \ + ((x) = 0, -EFAULT); \ +}) + +/* + * __put_user: - Write a simple value into user space, with less checking. + * @x: Value to copy to user space. + * @ptr: Destination address, in user space. + * + * Context: User context only. This function may sleep if pagefaults are + * enabled. + * + * This macro copies a single simple value from kernel space to user + * space. It supports simple types like char and int, but not larger + * data types like structures or arrays. + * + * @ptr must have pointer-to-simple-variable type, and @x must be assignable + * to the result of dereferencing @ptr. + * + * Caller must check the pointer with access_ok() before calling this + * function. + * + * Returns zero on success, or -EFAULT on error. + */ +#define __put_user(x, ptr) \ +({ \ + __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \ + __typeof__(*(ptr)) __pu_val = (x); \ + int __pu_err = 0; \ + \ + __chk_user_ptr(__pu_ptr); \ + switch (sizeof(*__pu_ptr)) { \ + case 1: \ + __put_data_asm(user_sb, __pu_ptr); \ + break; \ + case 2: \ + __put_data_asm(user_sh, __pu_ptr); \ + break; \ + case 4: \ + __put_data_asm(user_sw, __pu_ptr); \ + break; \ + case 8: \ + __PUT_DW(user_sd, __pu_ptr); \ + break; \ + default: \ + BUILD_BUG(); \ + } \ + \ + __pu_err; \ +}) + +/* + * __get_user: - Get a simple variable from user space, with less checking. + * @x: Variable to store result. + * @ptr: Source address, in user space. + * + * Context: User context only. This function may sleep if pagefaults are + * enabled. + * + * This macro copies a single simple variable from user space to kernel + * space. It supports simple types like char and int, but not larger + * data types like structures or arrays. + * + * @ptr must have pointer-to-simple-variable type, and the result of + * dereferencing @ptr must be assignable to @x without a cast. + * + * Caller must check the pointer with access_ok() before calling this + * function. + * + * Returns zero on success, or -EFAULT on error. + * On error, the variable @x is set to zero. + */ +#define __get_user(x, ptr) \ +({ \ + const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ + int __gu_err = 0; \ + \ + __chk_user_ptr(__gu_ptr); \ + switch (sizeof(*__gu_ptr)) { \ + case 1: \ + __get_data_asm((x), user_lb, __gu_ptr); \ + break; \ + case 2: \ + __get_data_asm((x), user_lh, __gu_ptr); \ + break; \ + case 4: \ + __get_data_asm((x), user_lw, __gu_ptr); \ + break; \ + case 8: \ + __GET_DW((x), user_ld, __gu_ptr); \ + break; \ + default: \ + BUILD_BUG(); \ + } \ + \ + __gu_err; \ +}) + +struct __large_struct { unsigned long buf[100]; }; +#define __m(x) (*(struct __large_struct __user *)(x)) + +#ifdef CONFIG_32BIT +#define __GET_DW(val, insn, ptr) __get_data_asm_ll32(val, insn, ptr) +#endif +#ifdef CONFIG_64BIT +#define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr) +#endif + +#define __get_data_asm(val, insn, addr) \ +{ \ + long __gu_tmp; \ + \ + __asm__ __volatile__( \ + "1: "insn("%1", "%3")" \n" \ + "2: \n" \ + " .insn \n" \ + " .section .fixup,\"ax\" \n" \ + "3: li %0, %4 \n" \ + " move %1, $0 \n" \ + " j 2b \n" \ + " .previous \n" \ + " .section __ex_table,\"a\" \n" \ + " "__UA_ADDR "\t1b, 3b \n" \ + " .previous \n" \ + : "=r" (__gu_err), "=r" (__gu_tmp) \ + : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \ + \ + (val) = (__typeof__(*(addr))) __gu_tmp; \ +} + +/* + * Get a long long 64 using 32 bit registers. + */ +#define __get_data_asm_ll32(val, insn, addr) \ +{ \ + union { \ + unsigned long long l; \ + __typeof__(*(addr)) t; \ + } __gu_tmp; \ + \ + __asm__ __volatile__( \ + "1: " insn("%1", "(%3)")" \n" \ + "2: " insn("%D1", "4(%3)")" \n" \ + "3: \n" \ + " .insn \n" \ + " .section .fixup,\"ax\" \n" \ + "4: li %0, %4 \n" \ + " move %1, $0 \n" \ + " move %D1, $0 \n" \ + " j 3b \n" \ + " .previous \n" \ + " .section __ex_table,\"a\" \n" \ + " " __UA_ADDR " 1b, 4b \n" \ + " " __UA_ADDR " 2b, 4b \n" \ + " .previous \n" \ + : "=r" (__gu_err), "=&r" (__gu_tmp.l) \ + : "0" (0), "r" (addr), "i" (-EFAULT)); \ + \ + (val) = __gu_tmp.t; \ +} + +#define __get_kernel_nofault(dst, src, type, err_label) \ +do { \ + int __gu_err; \ + \ + switch (sizeof(type)) { \ + case 1: \ + __get_data_asm(*(type *)(dst), kernel_lb, \ + (__force type *)(src)); \ + break; \ + case 2: \ + __get_data_asm(*(type *)(dst), kernel_lh, \ + (__force type *)(src)); \ + break; \ + case 4: \ + __get_data_asm(*(type *)(dst), kernel_lw, \ + (__force type *)(src)); \ + break; \ + case 8: \ + __GET_DW(*(type *)(dst), kernel_ld, \ + (__force type *)(src)); \ + break; \ + default: \ + BUILD_BUG(); \ + break; \ + } \ + if (unlikely(__gu_err)) \ + goto err_label; \ +} while (0) + +/* + * Yuck. We need two variants, one for 64bit operation and one + * for 32 bit mode and old iron. + */ +#ifdef CONFIG_32BIT +#define __PUT_DW(insn, ptr) __put_data_asm_ll32(insn, ptr) +#endif +#ifdef CONFIG_64BIT +#define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr) +#endif + +#define __put_data_asm(insn, ptr) \ +{ \ + __asm__ __volatile__( \ + "1: "insn("%z2", "%3")" # __put_data_asm \n" \ + "2: \n" \ + " .insn \n" \ + " .section .fixup,\"ax\" \n" \ + "3: li %0, %4 \n" \ + " j 2b \n" \ + " .previous \n" \ + " .section __ex_table,\"a\" \n" \ + " " __UA_ADDR " 1b, 3b \n" \ + " .previous \n" \ + : "=r" (__pu_err) \ + : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \ + "i" (-EFAULT)); \ +} + +#define __put_data_asm_ll32(insn, ptr) \ +{ \ + __asm__ __volatile__( \ + "1: "insn("%2", "(%3)")" # __put_data_asm_ll32 \n" \ + "2: "insn("%D2", "4(%3)")" \n" \ + "3: \n" \ + " .insn \n" \ + " .section .fixup,\"ax\" \n" \ + "4: li %0, %4 \n" \ + " j 3b \n" \ + " .previous \n" \ + " .section __ex_table,\"a\" \n" \ + " " __UA_ADDR " 1b, 4b \n" \ + " " __UA_ADDR " 2b, 4b \n" \ + " .previous" \ + : "=r" (__pu_err) \ + : "0" (0), "r" (__pu_val), "r" (ptr), \ + "i" (-EFAULT)); \ +} + +#define __put_kernel_nofault(dst, src, type, err_label) \ +do { \ + type __pu_val; \ + int __pu_err = 0; \ + \ + __pu_val = *(__force type *)(src); \ + switch (sizeof(type)) { \ + case 1: \ + __put_data_asm(kernel_sb, (type *)(dst)); \ + break; \ + case 2: \ + __put_data_asm(kernel_sh, (type *)(dst)); \ + break; \ + case 4: \ + __put_data_asm(kernel_sw, (type *)(dst)) \ + break; \ + case 8: \ + __PUT_DW(kernel_sd, (type *)(dst)); \ + break; \ + default: \ + BUILD_BUG(); \ + break; \ + } \ + if (unlikely(__pu_err)) \ + goto err_label; \ +} while (0) + + +/* + * We're generating jump to subroutines which will be outside the range of + * jump instructions + */ +#ifdef MODULE +#define __MODULE_JAL(destination) \ + ".set\tnoat\n\t" \ + __UA_LA "\t$1, " #destination "\n\t" \ + "jalr\t$1\n\t" \ + ".set\tat\n\t" +#else +#define __MODULE_JAL(destination) \ + "jal\t" #destination "\n\t" +#endif + +#if defined(CONFIG_CPU_DADDI_WORKAROUNDS) || (defined(CONFIG_EVA) && \ + defined(CONFIG_CPU_HAS_PREFETCH)) +#define DADDI_SCRATCH "$3" +#else +#define DADDI_SCRATCH "$0" +#endif + +extern size_t __raw_copy_from_user(void *__to, const void *__from, size_t __n); +extern size_t __raw_copy_to_user(void *__to, const void *__from, size_t __n); + +static inline unsigned long +raw_copy_from_user(void *to, const void __user *from, unsigned long n) +{ + register void *__cu_to_r __asm__("$4"); + register const void __user *__cu_from_r __asm__("$5"); + register long __cu_len_r __asm__("$6"); + + __cu_to_r = to; + __cu_from_r = from; + __cu_len_r = n; + + __asm__ __volatile__( + ".set\tnoreorder\n\t" + __MODULE_JAL(__raw_copy_from_user) + ".set\tnoat\n\t" + __UA_ADDU "\t$1, %1, %2\n\t" + ".set\tat\n\t" + ".set\treorder" + : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) + : + : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", + DADDI_SCRATCH, "memory"); + + return __cu_len_r; +} + +static inline unsigned long +raw_copy_to_user(void __user *to, const void *from, unsigned long n) +{ + register void __user *__cu_to_r __asm__("$4"); + register const void *__cu_from_r __asm__("$5"); + register long __cu_len_r __asm__("$6"); + + __cu_to_r = (to); + __cu_from_r = (from); + __cu_len_r = (n); + + __asm__ __volatile__( + __MODULE_JAL(__raw_copy_to_user) + : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) + : + : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", + DADDI_SCRATCH, "memory"); + + return __cu_len_r; +} + +#define INLINE_COPY_FROM_USER +#define INLINE_COPY_TO_USER + +extern __kernel_size_t __bzero(void __user *addr, __kernel_size_t size); + +/* + * __clear_user: - Zero a block of memory in user space, with less checking. + * @to: Destination address, in user space. + * @n: Number of bytes to zero. + * + * Zero a block of memory in user space. Caller must check + * the specified block with access_ok() before calling this function. + * + * Returns number of bytes that could not be cleared. + * On success, this will be zero. + */ +static inline __kernel_size_t +__clear_user(void __user *addr, __kernel_size_t size) +{ + __kernel_size_t res; + +#ifdef CONFIG_CPU_MICROMIPS +/* micromips memset / bzero also clobbers t7 & t8 */ +#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$15", "$24", "$31" +#else +#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$31" +#endif /* CONFIG_CPU_MICROMIPS */ + + might_fault(); + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, $0\n\t" + "move\t$6, %2\n\t" + __MODULE_JAL(__bzero) + "move\t%0, $6" + : "=r" (res) + : "r" (addr), "r" (size) + : bzero_clobbers); + + return res; +} + +#define clear_user(addr,n) \ +({ \ + void __user * __cl_addr = (addr); \ + unsigned long __cl_size = (n); \ + if (__cl_size && access_ok(__cl_addr, __cl_size)) \ + __cl_size = __clear_user(__cl_addr, __cl_size); \ + __cl_size; \ +}) + +extern long __strncpy_from_user_asm(char *__to, const char __user *__from, long __len); + +/* + * strncpy_from_user: - Copy a NUL terminated string from userspace. + * @dst: Destination address, in kernel space. This buffer must be at + * least @count bytes long. + * @src: Source address, in user space. + * @count: Maximum number of bytes to copy, including the trailing NUL. + * + * Copies a NUL-terminated string from userspace to kernel space. + * + * On success, returns the length of the string (not including the trailing + * NUL). + * + * If access to userspace fails, returns -EFAULT (some data may have been + * copied). + * + * If @count is smaller than the length of the string, copies @count bytes + * and returns @count. + */ +static inline long +strncpy_from_user(char *__to, const char __user *__from, long __len) +{ + long res; + + if (!access_ok(__from, __len)) + return -EFAULT; + + might_fault(); + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + "move\t$6, %3\n\t" + __MODULE_JAL(__strncpy_from_user_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (__to), "r" (__from), "r" (__len) + : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory"); + + return res; +} + +extern long __strnlen_user_asm(const char __user *s, long n); + +/* + * strnlen_user: - Get the size of a string in user space. + * @str: The string to measure. + * + * Context: User context only. This function may sleep if pagefaults are + * enabled. + * + * Get the size of a NUL-terminated string in user space. + * + * Returns the size of the string INCLUDING the terminating NUL. + * On exception, returns 0. + * If the string is too long, returns a value greater than @n. + */ +static inline long strnlen_user(const char __user *s, long n) +{ + long res; + + if (!access_ok(s, 1)) + return 0; + + might_fault(); + __asm__ __volatile__( + "move\t$4, %1\n\t" + "move\t$5, %2\n\t" + __MODULE_JAL(__strnlen_user_asm) + "move\t%0, $2" + : "=r" (res) + : "r" (s), "r" (n) + : "$2", "$4", "$5", __UA_t0, "$31"); + + return res; +} + +#endif /* _ASM_UACCESS_H */ -- cgit v1.2.3