1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef __ASM_ASM_EXTABLE_H
3 #define __ASM_ASM_EXTABLE_H
6 #define EX_TYPE_FIXUP 1
8 #define EX_TYPE_UACCESS_ERR_ZERO 3
9 #define EX_TYPE_LOAD_UNALIGNED_ZEROPAD 4
13 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
14 .pushsection __ex_table, "a"; \
17 .long ((fixup) - .); \
23 * Create an exception table entry for `insn`, which will branch to `fixup`
24 * when an unhandled fault is taken.
26 .macro _asm_extable, insn, fixup
27 __ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
31 * Create an exception table entry for `insn` if `fixup` is provided. Otherwise
34 .macro _cond_extable, insn, fixup
36 _asm_extable \insn, \fixup
40 #else /* __ASSEMBLY__ */
42 #include <linux/bits.h>
43 #include <linux/stringify.h>
45 #include <asm/gpr-num.h>
47 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
48 ".pushsection __ex_table, \"a\"\n" \
50 ".long ((" insn ") - .)\n" \
51 ".long ((" fixup ") - .)\n" \
52 ".short (" type ")\n" \
53 ".short (" data ")\n" \
56 #define _ASM_EXTABLE(insn, fixup) \
57 __ASM_EXTABLE_RAW(#insn, #fixup, __stringify(EX_TYPE_FIXUP), "0")
59 #define EX_DATA_REG_ERR_SHIFT 0
60 #define EX_DATA_REG_ERR GENMASK(4, 0)
61 #define EX_DATA_REG_ZERO_SHIFT 5
62 #define EX_DATA_REG_ZERO GENMASK(9, 5)
64 #define EX_DATA_REG(reg, gpr) \
65 "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
67 #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
68 __DEFINE_ASM_GPR_NUMS \
69 __ASM_EXTABLE_RAW(#insn, #fixup, \
70 __stringify(EX_TYPE_UACCESS_ERR_ZERO), \
72 EX_DATA_REG(ERR, err) " | " \
73 EX_DATA_REG(ZERO, zero) \
76 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
77 _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, wzr)
79 #define EX_DATA_REG_DATA_SHIFT 0
80 #define EX_DATA_REG_DATA GENMASK(4, 0)
81 #define EX_DATA_REG_ADDR_SHIFT 5
82 #define EX_DATA_REG_ADDR GENMASK(9, 5)
84 #define _ASM_EXTABLE_LOAD_UNALIGNED_ZEROPAD(insn, fixup, data, addr) \
85 __DEFINE_ASM_GPR_NUMS \
86 __ASM_EXTABLE_RAW(#insn, #fixup, \
87 __stringify(EX_TYPE_LOAD_UNALIGNED_ZEROPAD), \
89 EX_DATA_REG(DATA, data) " | " \
90 EX_DATA_REG(ADDR, addr) \
93 #endif /* __ASSEMBLY__ */
95 #endif /* __ASM_ASM_EXTABLE_H */