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| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
|---|---|
| 2 | #ifndef __ASM_ASM_EXTABLE_H |
| 3 | #define __ASM_ASM_EXTABLE_H |
| 4 | |
| 5 | #include <linux/bits.h> |
| 6 | #include <asm/gpr-num.h> |
| 7 | |
| 8 | #define EX_TYPE_NONE 0 |
| 9 | #define EX_TYPE_BPF 1 |
| 10 | #define EX_TYPE_UACCESS_ERR_ZERO 2 |
| 11 | #define EX_TYPE_KACCESS_ERR_ZERO 3 |
| 12 | #define EX_TYPE_UACCESS_CPY 4 |
| 13 | #define EX_TYPE_LOAD_UNALIGNED_ZEROPAD 5 |
| 14 | |
| 15 | /* Data fields for EX_TYPE_UACCESS_ERR_ZERO */ |
| 16 | #define EX_DATA_REG_ERR_SHIFT 0 |
| 17 | #define EX_DATA_REG_ERR GENMASK(4, 0) |
| 18 | #define EX_DATA_REG_ZERO_SHIFT 5 |
| 19 | #define EX_DATA_REG_ZERO GENMASK(9, 5) |
| 20 | |
| 21 | /* Data fields for EX_TYPE_LOAD_UNALIGNED_ZEROPAD */ |
| 22 | #define EX_DATA_REG_DATA_SHIFT 0 |
| 23 | #define EX_DATA_REG_DATA GENMASK(4, 0) |
| 24 | #define EX_DATA_REG_ADDR_SHIFT 5 |
| 25 | #define EX_DATA_REG_ADDR GENMASK(9, 5) |
| 26 | |
| 27 | /* Data fields for EX_TYPE_UACCESS_CPY */ |
| 28 | #define EX_DATA_UACCESS_WRITE BIT(0) |
| 29 | |
| 30 | #ifdef __ASSEMBLER__ |
| 31 | |
| 32 | #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \ |
| 33 | .pushsection __ex_table, "a"; \ |
| 34 | .align 2; \ |
| 35 | .long ((insn) - .); \ |
| 36 | .long ((fixup) - .); \ |
| 37 | .short (type); \ |
| 38 | .short (data); \ |
| 39 | .popsection; |
| 40 | |
| 41 | #define EX_DATA_REG(reg, gpr) \ |
| 42 | (.L__gpr_num_##gpr << EX_DATA_REG_##reg##_SHIFT) |
| 43 | |
| 44 | #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \ |
| 45 | __ASM_EXTABLE_RAW(insn, fixup, \ |
| 46 | EX_TYPE_UACCESS_ERR_ZERO, \ |
| 47 | ( \ |
| 48 | EX_DATA_REG(ERR, err) | \ |
| 49 | EX_DATA_REG(ZERO, zero) \ |
| 50 | )) |
| 51 | |
| 52 | #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \ |
| 53 | _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, wzr) |
| 54 | |
| 55 | #define _ASM_EXTABLE_UACCESS(insn, fixup) \ |
| 56 | _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr) |
| 57 | |
| 58 | /* |
| 59 | * Create an exception table entry for uaccess `insn`, which will branch to `fixup` |
| 60 | * when an unhandled fault is taken. |
| 61 | */ |
| 62 | .macro _asm_extable_uaccess, insn, fixup |
| 63 | _ASM_EXTABLE_UACCESS(\insn, \fixup) |
| 64 | .endm |
| 65 | |
| 66 | /* |
| 67 | * Create an exception table entry for `insn` if `fixup` is provided. Otherwise |
| 68 | * do nothing. |
| 69 | */ |
| 70 | .macro _cond_uaccess_extable, insn, fixup |
| 71 | .ifnc \fixup, |
| 72 | _asm_extable_uaccess \insn, \fixup |
| 73 | .endif |
| 74 | .endm |
| 75 | |
| 76 | .macro _asm_extable_uaccess_cpy, insn, fixup, uaccess_is_write |
| 77 | __ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_UACCESS_CPY, \uaccess_is_write) |
| 78 | .endm |
| 79 | |
| 80 | #else /* __ASSEMBLER__ */ |
| 81 | |
| 82 | #include <linux/stringify.h> |
| 83 | |
| 84 | #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \ |
| 85 | ".pushsection __ex_table, \"a\"\n" \ |
| 86 | ".align 2\n" \ |
| 87 | ".long ((" insn ") - .)\n" \ |
| 88 | ".long ((" fixup ") - .)\n" \ |
| 89 | ".short (" type ")\n" \ |
| 90 | ".short (" data ")\n" \ |
| 91 | ".popsection\n" |
| 92 | |
| 93 | #define EX_DATA_REG(reg, gpr) \ |
| 94 | "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")" |
| 95 | |
| 96 | #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \ |
| 97 | __DEFINE_ASM_GPR_NUMS \ |
| 98 | __ASM_EXTABLE_RAW(#insn, #fixup, \ |
| 99 | __stringify(EX_TYPE_UACCESS_ERR_ZERO), \ |
| 100 | "(" \ |
| 101 | EX_DATA_REG(ERR, err) " | " \ |
| 102 | EX_DATA_REG(ZERO, zero) \ |
| 103 | ")") |
| 104 | |
| 105 | #define _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, zero) \ |
| 106 | __DEFINE_ASM_GPR_NUMS \ |
| 107 | __ASM_EXTABLE_RAW(#insn, #fixup, \ |
| 108 | __stringify(EX_TYPE_KACCESS_ERR_ZERO), \ |
| 109 | "(" \ |
| 110 | EX_DATA_REG(ERR, err) " | " \ |
| 111 | EX_DATA_REG(ZERO, zero) \ |
| 112 | ")") |
| 113 | |
| 114 | #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \ |
| 115 | _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, wzr) |
| 116 | |
| 117 | #define _ASM_EXTABLE_UACCESS(insn, fixup) \ |
| 118 | _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr) |
| 119 | |
| 120 | #define _ASM_EXTABLE_KACCESS_ERR(insn, fixup, err) \ |
| 121 | _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, wzr) |
| 122 | |
| 123 | #define _ASM_EXTABLE_KACCESS(insn, fixup) \ |
| 124 | _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, wzr, wzr) |
| 125 | |
| 126 | #define _ASM_EXTABLE_LOAD_UNALIGNED_ZEROPAD(insn, fixup, data, addr) \ |
| 127 | __DEFINE_ASM_GPR_NUMS \ |
| 128 | __ASM_EXTABLE_RAW(#insn, #fixup, \ |
| 129 | __stringify(EX_TYPE_LOAD_UNALIGNED_ZEROPAD), \ |
| 130 | "(" \ |
| 131 | EX_DATA_REG(DATA, data) " | " \ |
| 132 | EX_DATA_REG(ADDR, addr) \ |
| 133 | ")") |
| 134 | |
| 135 | #endif /* __ASSEMBLER__ */ |
| 136 | |
| 137 | #endif /* __ASM_ASM_EXTABLE_H */ |
| 138 |
Warning: This file is not a C or C++ file. It does not have highlighting.