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), "0") 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