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