1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef __ASM_ASM_EXTABLE_H
3 #define __ASM_ASM_EXTABLE_H
5 #include <linux/bits.h>
6 #include <asm/gpr-num.h>
10 #define EX_TYPE_UACCESS_ERR_ZERO 2
11 #define EX_TYPE_KACCESS_ERR_ZERO 3
12 #define EX_TYPE_LOAD_UNALIGNED_ZEROPAD 4
14 /* Data fields for EX_TYPE_UACCESS_ERR_ZERO */
15 #define EX_DATA_REG_ERR_SHIFT 0
16 #define EX_DATA_REG_ERR GENMASK(4, 0)
17 #define EX_DATA_REG_ZERO_SHIFT 5
18 #define EX_DATA_REG_ZERO GENMASK(9, 5)
20 /* Data fields for EX_TYPE_LOAD_UNALIGNED_ZEROPAD */
21 #define EX_DATA_REG_DATA_SHIFT 0
22 #define EX_DATA_REG_DATA GENMASK(4, 0)
23 #define EX_DATA_REG_ADDR_SHIFT 5
24 #define EX_DATA_REG_ADDR GENMASK(9, 5)
28 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
29 .pushsection __ex_table, "a"; \
32 .long ((fixup) - .); \
37 #define EX_DATA_REG(reg, gpr) \
38 (.L__gpr_num_##gpr << EX_DATA_REG_##reg##_SHIFT)
40 #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
41 __ASM_EXTABLE_RAW(insn, fixup, \
42 EX_TYPE_UACCESS_ERR_ZERO, \
44 EX_DATA_REG(ERR, err) | \
45 EX_DATA_REG(ZERO, zero) \
48 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
49 _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, wzr)
51 #define _ASM_EXTABLE_UACCESS(insn, fixup) \
52 _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr)
55 * Create an exception table entry for uaccess `insn`, which will branch to `fixup`
56 * when an unhandled fault is taken.
58 .macro _asm_extable_uaccess, insn, fixup
59 _ASM_EXTABLE_UACCESS(\insn, \fixup)
63 * Create an exception table entry for `insn` if `fixup` is provided. Otherwise
66 .macro _cond_uaccess_extable, insn, fixup
68 _asm_extable_uaccess \insn, \fixup
72 #else /* __ASSEMBLY__ */
74 #include <linux/stringify.h>
76 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
77 ".pushsection __ex_table, \"a\"\n" \
79 ".long ((" insn ") - .)\n" \
80 ".long ((" fixup ") - .)\n" \
81 ".short (" type ")\n" \
82 ".short (" data ")\n" \
85 #define EX_DATA_REG(reg, gpr) \
86 "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
88 #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
89 __DEFINE_ASM_GPR_NUMS \
90 __ASM_EXTABLE_RAW(#insn, #fixup, \
91 __stringify(EX_TYPE_UACCESS_ERR_ZERO), \
93 EX_DATA_REG(ERR, err) " | " \
94 EX_DATA_REG(ZERO, zero) \
97 #define _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, zero) \
98 __DEFINE_ASM_GPR_NUMS \
99 __ASM_EXTABLE_RAW(#insn, #fixup, \
100 __stringify(EX_TYPE_KACCESS_ERR_ZERO), \
102 EX_DATA_REG(ERR, err) " | " \
103 EX_DATA_REG(ZERO, zero) \
106 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
107 _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, wzr)
109 #define _ASM_EXTABLE_UACCESS(insn, fixup) \
110 _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr)
112 #define _ASM_EXTABLE_KACCESS_ERR(insn, fixup, err) \
113 _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, wzr)
115 #define _ASM_EXTABLE_LOAD_UNALIGNED_ZEROPAD(insn, fixup, data, addr) \
116 __DEFINE_ASM_GPR_NUMS \
117 __ASM_EXTABLE_RAW(#insn, #fixup, \
118 __stringify(EX_TYPE_LOAD_UNALIGNED_ZEROPAD), \
120 EX_DATA_REG(DATA, data) " | " \
121 EX_DATA_REG(ADDR, addr) \
124 #endif /* __ASSEMBLY__ */
126 #endif /* __ASM_ASM_EXTABLE_H */