2023-08-30 17:31:07 +02:00
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/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __ASM_ASM_EXTABLE_H
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#define __ASM_ASM_EXTABLE_H
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#define EX_TYPE_NONE 0
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#define EX_TYPE_FIXUP 1
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#define EX_TYPE_BPF 2
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#define EX_TYPE_UACCESS_ERR_ZERO 3
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2023-10-24 12:59:35 +02:00
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#ifdef CONFIG_MMU
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2023-08-30 17:31:07 +02:00
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#ifdef __ASSEMBLY__
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#define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
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.pushsection __ex_table, "a"; \
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.balign 4; \
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.long ((insn) - .); \
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.long ((fixup) - .); \
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.short (type); \
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.short (data); \
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.popsection;
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.macro _asm_extable, insn, fixup
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__ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
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.endm
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#else /* __ASSEMBLY__ */
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#include <linux/bits.h>
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#include <linux/stringify.h>
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#include <asm/gpr-num.h>
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#define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
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".pushsection __ex_table, \"a\"\n" \
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".balign 4\n" \
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".long ((" insn ") - .)\n" \
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".long ((" fixup ") - .)\n" \
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".short (" type ")\n" \
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".short (" data ")\n" \
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".popsection\n"
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#define _ASM_EXTABLE(insn, fixup) \
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__ASM_EXTABLE_RAW(#insn, #fixup, __stringify(EX_TYPE_FIXUP), "0")
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#define EX_DATA_REG_ERR_SHIFT 0
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#define EX_DATA_REG_ERR GENMASK(4, 0)
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#define EX_DATA_REG_ZERO_SHIFT 5
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#define EX_DATA_REG_ZERO GENMASK(9, 5)
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#define EX_DATA_REG(reg, gpr) \
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"((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
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#define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
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__DEFINE_ASM_GPR_NUMS \
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__ASM_EXTABLE_RAW(#insn, #fixup, \
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__stringify(EX_TYPE_UACCESS_ERR_ZERO), \
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"(" \
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EX_DATA_REG(ERR, err) " | " \
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EX_DATA_REG(ZERO, zero) \
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")")
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#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
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_ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero)
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#endif /* __ASSEMBLY__ */
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2023-10-24 12:59:35 +02:00
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#else /* CONFIG_MMU */
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#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err)
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#endif /* CONFIG_MMU */
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2023-08-30 17:31:07 +02:00
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#endif /* __ASM_ASM_EXTABLE_H */
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