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3d36f4298b
Similar to other architectures such as arm64, x86, riscv and so on, use
offsets relative to the exception table entry values rather than their
absolute addresses for both the exception location and the fixup.
However, LoongArch label difference because it will actually produce two
relocations, a pair of R_LARCH_ADD32 and R_LARCH_SUB32. Take simple code
below for example:
$ cat test_ex_table.S
.section .text
1:
nop
.section __ex_table,"a"
.balign 4
.long (1b - .)
.previous
$ loongarch64-unknown-linux-gnu-gcc -c test_ex_table.S
$ loongarch64-unknown-linux-gnu-readelf -Wr test_ex_table.o
Relocation section '.rela__ex_table' at offset 0x100 contains 2 entries:
Offset Info Type Symbol's Value Symbol's Name + Addend
0000000000000000 0000000600000032 R_LARCH_ADD32 0000000000000000 .L1^B1 + 0
0000000000000000 0000000500000037 R_LARCH_SUB32 0000000000000000 L0^A + 0
The modpost will complain the R_LARCH_SUB32 relocation, so we need to
patch modpost.c to skip this relocation for .rela__ex_table section.
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
266 lines
7.8 KiB
C
266 lines
7.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*
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* Derived from MIPS:
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2007 Maciej W. Rozycki
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* Copyright (C) 2014, Imagination Technologies Ltd.
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*/
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#ifndef _ASM_UACCESS_H
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#define _ASM_UACCESS_H
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/extable.h>
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#include <asm/pgtable.h>
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#include <asm/extable.h>
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#include <asm/asm-extable.h>
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#include <asm-generic/access_ok.h>
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extern u64 __ua_limit;
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#define __UA_ADDR ".dword"
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#define __UA_LA "la.abs"
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#define __UA_LIMIT __ua_limit
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/*
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* get_user: - Get a simple variable from user space.
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and the result of
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* dereferencing @ptr must be assignable to @x without a cast.
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*
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* Returns zero on success, or -EFAULT on error.
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* On error, the variable @x is set to zero.
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*/
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#define get_user(x, ptr) \
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({ \
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const __typeof__(*(ptr)) __user *__p = (ptr); \
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\
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might_fault(); \
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access_ok(__p, sizeof(*__p)) ? __get_user((x), __p) : \
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((x) = 0, -EFAULT); \
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})
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/*
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* put_user: - Write a simple value into user space.
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and @x must be assignable
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* to the result of dereferencing @ptr.
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*
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* Returns zero on success, or -EFAULT on error.
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*/
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#define put_user(x, ptr) \
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({ \
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__typeof__(*(ptr)) __user *__p = (ptr); \
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\
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might_fault(); \
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access_ok(__p, sizeof(*__p)) ? __put_user((x), __p) : -EFAULT; \
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})
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/*
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* __get_user: - Get a simple variable from user space, with less checking.
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and the result of
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* dereferencing @ptr must be assignable to @x without a cast.
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*
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* Caller must check the pointer with access_ok() before calling this
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* function.
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*
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* Returns zero on success, or -EFAULT on error.
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* On error, the variable @x is set to zero.
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*/
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#define __get_user(x, ptr) \
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({ \
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int __gu_err = 0; \
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\
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__chk_user_ptr(ptr); \
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__get_user_common((x), sizeof(*(ptr)), ptr); \
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__gu_err; \
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})
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/*
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* __put_user: - Write a simple value into user space, with less checking.
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and @x must be assignable
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* to the result of dereferencing @ptr.
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*
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* Caller must check the pointer with access_ok() before calling this
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* function.
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*
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* Returns zero on success, or -EFAULT on error.
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*/
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#define __put_user(x, ptr) \
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({ \
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int __pu_err = 0; \
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__typeof__(*(ptr)) __pu_val; \
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\
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__pu_val = (x); \
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__chk_user_ptr(ptr); \
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__put_user_common(ptr, sizeof(*(ptr))); \
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__pu_err; \
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})
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) (*(struct __large_struct __user *)(x))
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#define __get_user_common(val, size, ptr) \
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do { \
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switch (size) { \
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case 1: __get_data_asm(val, "ld.b", ptr); break; \
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case 2: __get_data_asm(val, "ld.h", ptr); break; \
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case 4: __get_data_asm(val, "ld.w", ptr); break; \
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case 8: __get_data_asm(val, "ld.d", ptr); break; \
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default: BUILD_BUG(); break; \
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} \
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} while (0)
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#define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr)
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#define __get_data_asm(val, insn, ptr) \
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{ \
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long __gu_tmp; \
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\
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__asm__ __volatile__( \
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"1: " insn " %1, %2 \n" \
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"2: \n" \
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" .section .fixup,\"ax\" \n" \
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"3: li.w %0, %3 \n" \
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" move %1, $zero \n" \
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" b 2b \n" \
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" .previous \n" \
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_ASM_EXTABLE(1b, 3b) \
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: "+r" (__gu_err), "=r" (__gu_tmp) \
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: "m" (__m(ptr)), "i" (-EFAULT)); \
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\
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(val) = (__typeof__(*(ptr))) __gu_tmp; \
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}
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#define __put_user_common(ptr, size) \
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do { \
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switch (size) { \
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case 1: __put_data_asm("st.b", ptr); break; \
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case 2: __put_data_asm("st.h", ptr); break; \
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case 4: __put_data_asm("st.w", ptr); break; \
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case 8: __put_data_asm("st.d", ptr); break; \
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default: BUILD_BUG(); break; \
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} \
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} while (0)
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#define __put_kernel_common(ptr, size) __put_user_common(ptr, size)
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#define __put_data_asm(insn, ptr) \
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{ \
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__asm__ __volatile__( \
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"1: " insn " %z2, %1 # __put_user_asm\n" \
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"2: \n" \
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" .section .fixup,\"ax\" \n" \
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"3: li.w %0, %3 \n" \
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" b 2b \n" \
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" .previous \n" \
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_ASM_EXTABLE(1b, 3b) \
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: "+r" (__pu_err), "=m" (__m(ptr)) \
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: "Jr" (__pu_val), "i" (-EFAULT)); \
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}
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#define __get_kernel_nofault(dst, src, type, err_label) \
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do { \
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int __gu_err = 0; \
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\
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__get_kernel_common(*((type *)(dst)), sizeof(type), \
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(__force type *)(src)); \
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if (unlikely(__gu_err)) \
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goto err_label; \
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} while (0)
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#define __put_kernel_nofault(dst, src, type, err_label) \
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do { \
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type __pu_val; \
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int __pu_err = 0; \
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\
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__pu_val = *(__force type *)(src); \
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__put_kernel_common(((type *)(dst)), sizeof(type)); \
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if (unlikely(__pu_err)) \
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goto err_label; \
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} while (0)
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extern unsigned long __copy_user(void *to, const void *from, __kernel_size_t n);
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static inline unsigned long __must_check
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raw_copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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return __copy_user(to, (__force const void *)from, n);
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}
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static inline unsigned long __must_check
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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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return __copy_user((__force void *)to, from, n);
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}
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#define INLINE_COPY_FROM_USER
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#define INLINE_COPY_TO_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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* @addr: Destination address, in user space.
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* @size: 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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* Returns 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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extern unsigned long __clear_user(void __user *addr, __kernel_size_t size);
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#define clear_user(addr, n) \
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({ \
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void __user *__cl_addr = (addr); \
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unsigned long __cl_size = (n); \
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if (__cl_size && access_ok(__cl_addr, __cl_size)) \
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__cl_size = __clear_user(__cl_addr, __cl_size); \
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__cl_size; \
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})
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extern long strncpy_from_user(char *to, const char __user *from, long n);
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extern long strnlen_user(const char __user *str, long n);
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#endif /* _ASM_UACCESS_H */
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