1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef __ASM_ASM_EXTABLE_H
3 #define __ASM_ASM_EXTABLE_H
4
5 #define EX_TYPE_NONE 0
6 #define EX_TYPE_FIXUP 1
7 #define EX_TYPE_BPF 2
8 #define EX_TYPE_UACCESS_ERR_ZERO 3
9 #define EX_TYPE_LOAD_UNALIGNED_ZEROPAD 4
10
11 #ifdef CONFIG_MMU
12
13 #ifdef __ASSEMBLY__
14
15 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
16 .pushsection __ex_table, "a"; \
17 .balign 4; \
18 .long ((insn) - .); \
19 .long ((fixup) - .); \
20 .short (type); \
21 .short (data); \
22 .popsection;
23
24 .macro _asm_extable, insn, fixup
25 __ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
26 .endm
27
28 #else /* __ASSEMBLY__ */
29
30 #include <linux/bits.h>
31 #include <linux/stringify.h>
32 #include <asm/gpr-num.h>
33
34 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
35 ".pushsection __ex_table, \"a\"\n" \
36 ".balign 4\n" \
37 ".long ((" insn ") - .)\n" \
38 ".long ((" fixup ") - .)\n" \
39 ".short (" type ")\n" \
40 ".short (" data ")\n" \
41 ".popsection\n"
42
43 #define _ASM_EXTABLE(insn, fixup) \
44 __ASM_EXTABLE_RAW(#insn, #fixup, __stringify(EX_TYPE_FIXUP), "")
45
46 #define EX_DATA_REG_ERR_SHIFT 0
47 #define EX_DATA_REG_ERR GENMASK(4, 0)
48 #define EX_DATA_REG_ZERO_SHIFT 5
49 #define EX_DATA_REG_ZERO GENMASK(9, 5)
50
51 #define EX_DATA_REG_DATA_SHIFT 0
52 #define EX_DATA_REG_DATA GENMASK(4, 0)
53 #define EX_DATA_REG_ADDR_SHIFT 5
54 #define EX_DATA_REG_ADDR GENMASK(9, 5)
55
56 #define EX_DATA_REG(reg, gpr) \
57 "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
58
59 #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
60 __DEFINE_ASM_GPR_NUMS \
61 __ASM_EXTABLE_RAW(#insn, #fixup, \
62 __stringify(EX_TYPE_UACCESS_ERR_ZERO), \
63 "(" \
64 EX_DATA_REG(ERR, err) " | " \
65 EX_DATA_REG(ZERO, zero) \
66 ")")
67
68 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
69 _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero)
70
71 #define _ASM_EXTABLE_LOAD_UNALIGNED_ZEROPAD(insn, fixup, data, addr) \
72 __DEFINE_ASM_GPR_NUMS \
73 __ASM_EXTABLE_RAW(#insn, #fixup, \
74 __stringify(EX_TYPE_LOAD_UNALIGNED_ZEROPAD), \
75 "(" \
76 EX_DATA_REG(DATA, data) " | " \
77 EX_DATA_REG(ADDR, addr) \
78 ")")
79
80 #endif /* __ASSEMBLY__ */
81
82 #else /* CONFIG_MMU */
83 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err)
84 #endif /* CONFIG_MMU */
85
86 #endif /* __ASM_ASM_EXTABLE_H */
87
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