127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
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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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#include <linux/bits.h>
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#include <asm/gpr-num.h>
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#define EX_TYPE_NONE 0
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#define EX_TYPE_BPF 1
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#define EX_TYPE_UACCESS_ERR_ZERO 2
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#define EX_TYPE_KACCESS_ERR_ZERO 3
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#define EX_TYPE_LOAD_UNALIGNED_ZEROPAD 4
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/* Data fields for EX_TYPE_UACCESS_ERR_ZERO */
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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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/* Data fields for EX_TYPE_LOAD_UNALIGNED_ZEROPAD */
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#define EX_DATA_REG_DATA_SHIFT 0
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#define EX_DATA_REG_DATA GENMASK(4, 0)
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#define EX_DATA_REG_ADDR_SHIFT 5
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#define EX_DATA_REG_ADDR GENMASK(9, 5)
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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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.align 2; \
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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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#define EX_DATA_REG(reg, gpr) \
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(.L__gpr_num_##gpr << EX_DATA_REG_##reg##_SHIFT)
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#define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
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__ASM_EXTABLE_RAW(insn, fixup, \
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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, wzr)
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#define _ASM_EXTABLE_UACCESS(insn, fixup) \
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_ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr)
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/*
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* Create an exception table entry for uaccess `insn`, which will branch to `fixup`
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* when an unhandled fault is taken.
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*/
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.macro _asm_extable_uaccess, insn, fixup
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_ASM_EXTABLE_UACCESS(\insn, \fixup)
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.endm
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/*
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* Create an exception table entry for `insn` if `fixup` is provided. Otherwise
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* do nothing.
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*/
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.macro _cond_uaccess_extable, insn, fixup
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.ifnc \fixup,
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_asm_extable_uaccess \insn, \fixup
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.endif
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.endm
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#else /* __ASSEMBLY__ */
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#include <linux/stringify.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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".align 2\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 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_KACCESS_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_KACCESS_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, wzr)
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#define _ASM_EXTABLE_UACCESS(insn, fixup) \
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_ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr)
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#define _ASM_EXTABLE_KACCESS_ERR(insn, fixup, err) \
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_ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, wzr)
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#define _ASM_EXTABLE_LOAD_UNALIGNED_ZEROPAD(insn, fixup, data, addr) \
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__DEFINE_ASM_GPR_NUMS \
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__ASM_EXTABLE_RAW(#insn, #fixup, \
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__stringify(EX_TYPE_LOAD_UNALIGNED_ZEROPAD), \
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"(" \
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EX_DATA_REG(DATA, data) " | " \
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EX_DATA_REG(ADDR, addr) \
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")")
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_ASM_EXTABLE_H */
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