| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ARCH_POWERPC_UACCESS_H |
| #define _ARCH_POWERPC_UACCESS_H |
| |
| #include <asm/processor.h> |
| #include <asm/page.h> |
| #include <asm/extable.h> |
| #include <asm/kup.h> |
| |
| #ifdef __powerpc64__ |
| /* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */ |
| #define TASK_SIZE_MAX TASK_SIZE_USER64 |
| #endif |
| |
| #include <asm-generic/access_ok.h> |
| |
| /* |
| * These are 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. |
| * |
| * The "__xxx" versions of the user access functions are versions that |
| * do not verify the address space, that must have been done previously |
| * with a separate "access_ok()" call (this is used when we do multiple |
| * accesses to the same area of user memory). |
| * |
| * As we use the same address space for kernel and user data on the |
| * PowerPC, we can just do these as direct assignments. (Of course, the |
| * exception handling means that it's no longer "just"...) |
| * |
| */ |
| #define __put_user(x, ptr) \ |
| ({ \ |
| long __pu_err; \ |
| __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ |
| __typeof__(*(ptr)) __pu_val = (__typeof__(*(ptr)))(x); \ |
| __typeof__(sizeof(*(ptr))) __pu_size = sizeof(*(ptr)); \ |
| \ |
| might_fault(); \ |
| do { \ |
| __label__ __pu_failed; \ |
| \ |
| allow_write_to_user(__pu_addr, __pu_size); \ |
| __put_user_size_goto(__pu_val, __pu_addr, __pu_size, __pu_failed); \ |
| prevent_write_to_user(__pu_addr, __pu_size); \ |
| __pu_err = 0; \ |
| break; \ |
| \ |
| __pu_failed: \ |
| prevent_write_to_user(__pu_addr, __pu_size); \ |
| __pu_err = -EFAULT; \ |
| } while (0); \ |
| \ |
| __pu_err; \ |
| }) |
| |
| #define put_user(x, ptr) \ |
| ({ \ |
| __typeof__(*(ptr)) __user *_pu_addr = (ptr); \ |
| \ |
| access_ok(_pu_addr, sizeof(*(ptr))) ? \ |
| __put_user(x, _pu_addr) : -EFAULT; \ |
| }) |
| |
| /* |
| * We don't tell gcc that we are accessing memory, but this is OK |
| * because we do not write to any memory gcc knows about, so there |
| * are no aliasing issues. |
| */ |
| /* -mprefixed can generate offsets beyond range, fall back hack */ |
| #ifdef CONFIG_PPC_KERNEL_PREFIXED |
| #define __put_user_asm_goto(x, addr, label, op) \ |
| asm_volatile_goto( \ |
| "1: " op " %0,0(%1) # put_user\n" \ |
| EX_TABLE(1b, %l2) \ |
| : \ |
| : "r" (x), "b" (addr) \ |
| : \ |
| : label) |
| #else |
| #define __put_user_asm_goto(x, addr, label, op) \ |
| asm_volatile_goto( \ |
| "1: " op "%U1%X1 %0,%1 # put_user\n" \ |
| EX_TABLE(1b, %l2) \ |
| : \ |
| : "r" (x), "m<>" (*addr) \ |
| : \ |
| : label) |
| #endif |
| |
| #ifdef __powerpc64__ |
| #define __put_user_asm2_goto(x, ptr, label) \ |
| __put_user_asm_goto(x, ptr, label, "std") |
| #else /* __powerpc64__ */ |
| #define __put_user_asm2_goto(x, addr, label) \ |
| asm_volatile_goto( \ |
| "1: stw%X1 %0, %1\n" \ |
| "2: stw%X1 %L0, %L1\n" \ |
| EX_TABLE(1b, %l2) \ |
| EX_TABLE(2b, %l2) \ |
| : \ |
| : "r" (x), "m" (*addr) \ |
| : \ |
| : label) |
| #endif /* __powerpc64__ */ |
| |
| #define __put_user_size_goto(x, ptr, size, label) \ |
| do { \ |
| __typeof__(*(ptr)) __user *__pus_addr = (ptr); \ |
| \ |
| switch (size) { \ |
| case 1: __put_user_asm_goto(x, __pus_addr, label, "stb"); break; \ |
| case 2: __put_user_asm_goto(x, __pus_addr, label, "sth"); break; \ |
| case 4: __put_user_asm_goto(x, __pus_addr, label, "stw"); break; \ |
| case 8: __put_user_asm2_goto(x, __pus_addr, label); break; \ |
| default: BUILD_BUG(); \ |
| } \ |
| } while (0) |
| |
| /* |
| * This does an atomic 128 byte aligned load from userspace. |
| * Upto caller to do enable_kernel_vmx() before calling! |
| */ |
| #define __get_user_atomic_128_aligned(kaddr, uaddr, err) \ |
| __asm__ __volatile__( \ |
| ".machine push\n" \ |
| ".machine altivec\n" \ |
| "1: lvx 0,0,%1 # get user\n" \ |
| " stvx 0,0,%2 # put kernel\n" \ |
| ".machine pop\n" \ |
| "2:\n" \ |
| ".section .fixup,\"ax\"\n" \ |
| "3: li %0,%3\n" \ |
| " b 2b\n" \ |
| ".previous\n" \ |
| EX_TABLE(1b, 3b) \ |
| : "=r" (err) \ |
| : "b" (uaddr), "b" (kaddr), "i" (-EFAULT), "0" (err)) |
| |
| #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT |
| |
| /* -mprefixed can generate offsets beyond range, fall back hack */ |
| #ifdef CONFIG_PPC_KERNEL_PREFIXED |
| #define __get_user_asm_goto(x, addr, label, op) \ |
| asm_volatile_goto( \ |
| "1: "op" %0,0(%1) # get_user\n" \ |
| EX_TABLE(1b, %l2) \ |
| : "=r" (x) \ |
| : "b" (addr) \ |
| : \ |
| : label) |
| #else |
| #define __get_user_asm_goto(x, addr, label, op) \ |
| asm_volatile_goto( \ |
| "1: "op"%U1%X1 %0, %1 # get_user\n" \ |
| EX_TABLE(1b, %l2) \ |
| : "=r" (x) \ |
| : "m<>" (*addr) \ |
| : \ |
| : label) |
| #endif |
| |
| #ifdef __powerpc64__ |
| #define __get_user_asm2_goto(x, addr, label) \ |
| __get_user_asm_goto(x, addr, label, "ld") |
| #else /* __powerpc64__ */ |
| #define __get_user_asm2_goto(x, addr, label) \ |
| asm_volatile_goto( \ |
| "1: lwz%X1 %0, %1\n" \ |
| "2: lwz%X1 %L0, %L1\n" \ |
| EX_TABLE(1b, %l2) \ |
| EX_TABLE(2b, %l2) \ |
| : "=&r" (x) \ |
| : "m" (*addr) \ |
| : \ |
| : label) |
| #endif /* __powerpc64__ */ |
| |
| #define __get_user_size_goto(x, ptr, size, label) \ |
| do { \ |
| BUILD_BUG_ON(size > sizeof(x)); \ |
| switch (size) { \ |
| case 1: __get_user_asm_goto(x, (u8 __user *)ptr, label, "lbz"); break; \ |
| case 2: __get_user_asm_goto(x, (u16 __user *)ptr, label, "lhz"); break; \ |
| case 4: __get_user_asm_goto(x, (u32 __user *)ptr, label, "lwz"); break; \ |
| case 8: __get_user_asm2_goto(x, (u64 __user *)ptr, label); break; \ |
| default: x = 0; BUILD_BUG(); \ |
| } \ |
| } while (0) |
| |
| #define __get_user_size_allowed(x, ptr, size, retval) \ |
| do { \ |
| __label__ __gus_failed; \ |
| \ |
| __get_user_size_goto(x, ptr, size, __gus_failed); \ |
| retval = 0; \ |
| break; \ |
| __gus_failed: \ |
| x = 0; \ |
| retval = -EFAULT; \ |
| } while (0) |
| |
| #else /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */ |
| |
| #define __get_user_asm(x, addr, err, op) \ |
| __asm__ __volatile__( \ |
| "1: "op"%U2%X2 %1, %2 # get_user\n" \ |
| "2:\n" \ |
| ".section .fixup,\"ax\"\n" \ |
| "3: li %0,%3\n" \ |
| " li %1,0\n" \ |
| " b 2b\n" \ |
| ".previous\n" \ |
| EX_TABLE(1b, 3b) \ |
| : "=r" (err), "=r" (x) \ |
| : "m<>" (*addr), "i" (-EFAULT), "0" (err)) |
| |
| #ifdef __powerpc64__ |
| #define __get_user_asm2(x, addr, err) \ |
| __get_user_asm(x, addr, err, "ld") |
| #else /* __powerpc64__ */ |
| #define __get_user_asm2(x, addr, err) \ |
| __asm__ __volatile__( \ |
| "1: lwz%X2 %1, %2\n" \ |
| "2: lwz%X2 %L1, %L2\n" \ |
| "3:\n" \ |
| ".section .fixup,\"ax\"\n" \ |
| "4: li %0,%3\n" \ |
| " li %1,0\n" \ |
| " li %1+1,0\n" \ |
| " b 3b\n" \ |
| ".previous\n" \ |
| EX_TABLE(1b, 4b) \ |
| EX_TABLE(2b, 4b) \ |
| : "=r" (err), "=&r" (x) \ |
| : "m" (*addr), "i" (-EFAULT), "0" (err)) |
| #endif /* __powerpc64__ */ |
| |
| #define __get_user_size_allowed(x, ptr, size, retval) \ |
| do { \ |
| retval = 0; \ |
| BUILD_BUG_ON(size > sizeof(x)); \ |
| switch (size) { \ |
| case 1: __get_user_asm(x, (u8 __user *)ptr, retval, "lbz"); break; \ |
| case 2: __get_user_asm(x, (u16 __user *)ptr, retval, "lhz"); break; \ |
| case 4: __get_user_asm(x, (u32 __user *)ptr, retval, "lwz"); break; \ |
| case 8: __get_user_asm2(x, (u64 __user *)ptr, retval); break; \ |
| default: x = 0; BUILD_BUG(); \ |
| } \ |
| } while (0) |
| |
| #define __get_user_size_goto(x, ptr, size, label) \ |
| do { \ |
| long __gus_retval; \ |
| \ |
| __get_user_size_allowed(x, ptr, size, __gus_retval); \ |
| if (__gus_retval) \ |
| goto label; \ |
| } while (0) |
| |
| #endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */ |
| |
| /* |
| * This is a type: either unsigned long, if the argument fits into |
| * that type, or otherwise unsigned long long. |
| */ |
| #define __long_type(x) \ |
| __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) |
| |
| #define __get_user(x, ptr) \ |
| ({ \ |
| long __gu_err; \ |
| __long_type(*(ptr)) __gu_val; \ |
| __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ |
| __typeof__(sizeof(*(ptr))) __gu_size = sizeof(*(ptr)); \ |
| \ |
| might_fault(); \ |
| allow_read_from_user(__gu_addr, __gu_size); \ |
| __get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \ |
| prevent_read_from_user(__gu_addr, __gu_size); \ |
| (x) = (__typeof__(*(ptr)))__gu_val; \ |
| \ |
| __gu_err; \ |
| }) |
| |
| #define get_user(x, ptr) \ |
| ({ \ |
| __typeof__(*(ptr)) __user *_gu_addr = (ptr); \ |
| \ |
| access_ok(_gu_addr, sizeof(*(ptr))) ? \ |
| __get_user(x, _gu_addr) : \ |
| ((x) = (__force __typeof__(*(ptr)))0, -EFAULT); \ |
| }) |
| |
| /* more complex routines */ |
| |
| extern unsigned long __copy_tofrom_user(void __user *to, |
| const void __user *from, unsigned long size); |
| |
| #ifdef __powerpc64__ |
| static inline unsigned long |
| raw_copy_in_user(void __user *to, const void __user *from, unsigned long n) |
| { |
| unsigned long ret; |
| |
| allow_read_write_user(to, from, n); |
| ret = __copy_tofrom_user(to, from, n); |
| prevent_read_write_user(to, from, n); |
| return ret; |
| } |
| #endif /* __powerpc64__ */ |
| |
| static inline unsigned long raw_copy_from_user(void *to, |
| const void __user *from, unsigned long n) |
| { |
| unsigned long ret; |
| |
| allow_read_from_user(from, n); |
| ret = __copy_tofrom_user((__force void __user *)to, from, n); |
| prevent_read_from_user(from, n); |
| return ret; |
| } |
| |
| static inline unsigned long |
| raw_copy_to_user(void __user *to, const void *from, unsigned long n) |
| { |
| unsigned long ret; |
| |
| allow_write_to_user(to, n); |
| ret = __copy_tofrom_user(to, (__force const void __user *)from, n); |
| prevent_write_to_user(to, n); |
| return ret; |
| } |
| |
| unsigned long __arch_clear_user(void __user *addr, unsigned long size); |
| |
| static inline unsigned long __clear_user(void __user *addr, unsigned long size) |
| { |
| unsigned long ret; |
| |
| might_fault(); |
| allow_write_to_user(addr, size); |
| ret = __arch_clear_user(addr, size); |
| prevent_write_to_user(addr, size); |
| return ret; |
| } |
| |
| static inline unsigned long clear_user(void __user *addr, unsigned long size) |
| { |
| return likely(access_ok(addr, size)) ? __clear_user(addr, size) : size; |
| } |
| |
| extern long strncpy_from_user(char *dst, const char __user *src, long count); |
| extern __must_check long strnlen_user(const char __user *str, long n); |
| |
| #ifdef CONFIG_ARCH_HAS_COPY_MC |
| unsigned long __must_check |
| copy_mc_generic(void *to, const void *from, unsigned long size); |
| |
| static inline unsigned long __must_check |
| copy_mc_to_kernel(void *to, const void *from, unsigned long size) |
| { |
| return copy_mc_generic(to, from, size); |
| } |
| #define copy_mc_to_kernel copy_mc_to_kernel |
| |
| static inline unsigned long __must_check |
| copy_mc_to_user(void __user *to, const void *from, unsigned long n) |
| { |
| if (check_copy_size(from, n, true)) { |
| if (access_ok(to, n)) { |
| allow_write_to_user(to, n); |
| n = copy_mc_generic((void *)to, from, n); |
| prevent_write_to_user(to, n); |
| } |
| } |
| |
| return n; |
| } |
| #endif |
| |
| extern long __copy_from_user_flushcache(void *dst, const void __user *src, |
| unsigned size); |
| |
| static __must_check __always_inline bool user_access_begin(const void __user *ptr, size_t len) |
| { |
| if (unlikely(!access_ok(ptr, len))) |
| return false; |
| |
| might_fault(); |
| |
| allow_read_write_user((void __user *)ptr, ptr, len); |
| return true; |
| } |
| #define user_access_begin user_access_begin |
| #define user_access_end prevent_current_access_user |
| #define user_access_save prevent_user_access_return |
| #define user_access_restore restore_user_access |
| |
| static __must_check __always_inline bool |
| user_read_access_begin(const void __user *ptr, size_t len) |
| { |
| if (unlikely(!access_ok(ptr, len))) |
| return false; |
| |
| might_fault(); |
| |
| allow_read_from_user(ptr, len); |
| return true; |
| } |
| #define user_read_access_begin user_read_access_begin |
| #define user_read_access_end prevent_current_read_from_user |
| |
| static __must_check __always_inline bool |
| user_write_access_begin(const void __user *ptr, size_t len) |
| { |
| if (unlikely(!access_ok(ptr, len))) |
| return false; |
| |
| might_fault(); |
| |
| allow_write_to_user((void __user *)ptr, len); |
| return true; |
| } |
| #define user_write_access_begin user_write_access_begin |
| #define user_write_access_end prevent_current_write_to_user |
| |
| #define unsafe_get_user(x, p, e) do { \ |
| __long_type(*(p)) __gu_val; \ |
| __typeof__(*(p)) __user *__gu_addr = (p); \ |
| \ |
| __get_user_size_goto(__gu_val, __gu_addr, sizeof(*(p)), e); \ |
| (x) = (__typeof__(*(p)))__gu_val; \ |
| } while (0) |
| |
| #define unsafe_put_user(x, p, e) \ |
| __put_user_size_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e) |
| |
| #define unsafe_copy_from_user(d, s, l, e) \ |
| do { \ |
| u8 *_dst = (u8 *)(d); \ |
| const u8 __user *_src = (const u8 __user *)(s); \ |
| size_t _len = (l); \ |
| int _i; \ |
| \ |
| for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \ |
| unsafe_get_user(*(u64 *)(_dst + _i), (u64 __user *)(_src + _i), e); \ |
| if (_len & 4) { \ |
| unsafe_get_user(*(u32 *)(_dst + _i), (u32 __user *)(_src + _i), e); \ |
| _i += 4; \ |
| } \ |
| if (_len & 2) { \ |
| unsafe_get_user(*(u16 *)(_dst + _i), (u16 __user *)(_src + _i), e); \ |
| _i += 2; \ |
| } \ |
| if (_len & 1) \ |
| unsafe_get_user(*(u8 *)(_dst + _i), (u8 __user *)(_src + _i), e); \ |
| } while (0) |
| |
| #define unsafe_copy_to_user(d, s, l, e) \ |
| do { \ |
| u8 __user *_dst = (u8 __user *)(d); \ |
| const u8 *_src = (const u8 *)(s); \ |
| size_t _len = (l); \ |
| int _i; \ |
| \ |
| for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \ |
| unsafe_put_user(*(u64 *)(_src + _i), (u64 __user *)(_dst + _i), e); \ |
| if (_len & 4) { \ |
| unsafe_put_user(*(u32*)(_src + _i), (u32 __user *)(_dst + _i), e); \ |
| _i += 4; \ |
| } \ |
| if (_len & 2) { \ |
| unsafe_put_user(*(u16*)(_src + _i), (u16 __user *)(_dst + _i), e); \ |
| _i += 2; \ |
| } \ |
| if (_len & 1) \ |
| unsafe_put_user(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e); \ |
| } while (0) |
| |
| #define __get_kernel_nofault(dst, src, type, err_label) \ |
| __get_user_size_goto(*((type *)(dst)), \ |
| (__force type __user *)(src), sizeof(type), err_label) |
| |
| #define __put_kernel_nofault(dst, src, type, err_label) \ |
| __put_user_size_goto(*((type *)(src)), \ |
| (__force type __user *)(dst), sizeof(type), err_label) |
| |
| #endif /* _ARCH_POWERPC_UACCESS_H */ |