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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __ASM_ASM_EXTABLE_H
#define __ASM_ASM_EXTABLE_H
#include <linux/bits.h>
#include <asm/gpr-num.h>
#define EX_TYPE_NONE 0
#define EX_TYPE_BPF 1
#define EX_TYPE_UACCESS_ERR_ZERO 2
#define EX_TYPE_KACCESS_ERR_ZERO 3
#define EX_TYPE_LOAD_UNALIGNED_ZEROPAD 4
/* Data fields for EX_TYPE_UACCESS_ERR_ZERO */
#define EX_DATA_REG_ERR_SHIFT 0
#define EX_DATA_REG_ERR GENMASK(4, 0)
#define EX_DATA_REG_ZERO_SHIFT 5
#define EX_DATA_REG_ZERO GENMASK(9, 5)
/* Data fields for EX_TYPE_LOAD_UNALIGNED_ZEROPAD */
#define EX_DATA_REG_DATA_SHIFT 0
#define EX_DATA_REG_DATA GENMASK(4, 0)
#define EX_DATA_REG_ADDR_SHIFT 5
#define EX_DATA_REG_ADDR GENMASK(9, 5)
#ifdef __ASSEMBLY__
#define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
.pushsection __ex_table, "a"; \
.align 2; \
.long ((insn) - .); \
.long ((fixup) - .); \
.short (type); \
.short (data); \
.popsection;
#define EX_DATA_REG(reg, gpr) \
(.L__gpr_num_##gpr << EX_DATA_REG_##reg##_SHIFT)
#define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
__ASM_EXTABLE_RAW(insn, fixup, \
EX_TYPE_UACCESS_ERR_ZERO, \
( \
EX_DATA_REG(ERR, err) | \
EX_DATA_REG(ZERO, zero) \
))
#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
_ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, wzr)
#define _ASM_EXTABLE_UACCESS(insn, fixup) \
_ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr)
/*
* Create an exception table entry for uaccess `insn`, which will branch to `fixup`
* when an unhandled fault is taken.
*/
.macro _asm_extable_uaccess, insn, fixup
_ASM_EXTABLE_UACCESS(\insn, \fixup)
.endm
/*
* Create an exception table entry for `insn` if `fixup` is provided. Otherwise
* do nothing.
*/
.macro _cond_uaccess_extable, insn, fixup
.ifnc \fixup,
_asm_extable_uaccess \insn, \fixup
.endif
.endm
#else /* __ASSEMBLY__ */
#include <linux/stringify.h>
#define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
".pushsection __ex_table, \"a\"\n" \
".align 2\n" \
".long ((" insn ") - .)\n" \
".long ((" fixup ") - .)\n" \
".short (" type ")\n" \
".short (" data ")\n" \
".popsection\n"
#define EX_DATA_REG(reg, gpr) \
"((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
#define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
__DEFINE_ASM_GPR_NUMS \
__ASM_EXTABLE_RAW(#insn, #fixup, \
__stringify(EX_TYPE_UACCESS_ERR_ZERO), \
"(" \
EX_DATA_REG(ERR, err) " | " \
EX_DATA_REG(ZERO, zero) \
")")
#define _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, zero) \
__DEFINE_ASM_GPR_NUMS \
__ASM_EXTABLE_RAW(#insn, #fixup, \
__stringify(EX_TYPE_KACCESS_ERR_ZERO), \
"(" \
EX_DATA_REG(ERR, err) " | " \
EX_DATA_REG(ZERO, zero) \
")")
#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
_ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, wzr)
#define _ASM_EXTABLE_UACCESS(insn, fixup) \
_ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr)
#define _ASM_EXTABLE_KACCESS_ERR(insn, fixup, err) \
_ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, wzr)
#define _ASM_EXTABLE_LOAD_UNALIGNED_ZEROPAD(insn, fixup, data, addr) \
__DEFINE_ASM_GPR_NUMS \
__ASM_EXTABLE_RAW(#insn, #fixup, \
__stringify(EX_TYPE_LOAD_UNALIGNED_ZEROPAD), \
"(" \
EX_DATA_REG(DATA, data) " | " \
EX_DATA_REG(ADDR, addr) \
")")
#endif /* __ASSEMBLY__ */
#endif /* __ASM_ASM_EXTABLE_H */
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