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 10 #ifdef CONFIG_MMU 11 12 #ifdef __ASSEMBLY__ 13 14 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \ 15 .pushsection __ex_table, "a"; \ 16 .balign 4; \ 17 .long ((insn) - .); \ 18 .long ((fixup) - .); \ 19 .short (type); \ 20 .short (data); \ 21 .popsection; 22 23 .macro _asm_extable, insn, fixup 24 __ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0) 25 .endm 26 27 #else /* __ASSEMBLY__ */ 28 29 #include <linux/bits.h> 30 #include <linux/stringify.h> 31 #include <asm/gpr-num.h> 32 33 #define __ASM_EXTABLE_RAW(insn, fixup, type, data) \ 34 ".pushsection __ex_table, \"a\"\n" \ 35 ".balign 4\n" \ 36 ".long ((" insn ") - .)\n" \ 37 ".long ((" fixup ") - .)\n" \ 38 ".short (" type ")\n" \ 39 ".short (" data ")\n" \ 40 ".popsection\n" 41 42 #define _ASM_EXTABLE(insn, fixup) \ 43 __ASM_EXTABLE_RAW(#insn, #fixup, __stringify(EX_TYPE_FIXUP), "0") 44 45 #define EX_DATA_REG_ERR_SHIFT 0 46 #define EX_DATA_REG_ERR GENMASK(4, 0) 47 #define EX_DATA_REG_ZERO_SHIFT 5 48 #define EX_DATA_REG_ZERO GENMASK(9, 5) 49 50 #define EX_DATA_REG(reg, gpr) \ 51 "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")" 52 53 #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \ 54 __DEFINE_ASM_GPR_NUMS \ 55 __ASM_EXTABLE_RAW(#insn, #fixup, \ 56 __stringify(EX_TYPE_UACCESS_ERR_ZERO), \ 57 "(" \ 58 EX_DATA_REG(ERR, err) " | " \ 59 EX_DATA_REG(ZERO, zero) \ 60 ")") 61 62 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \ 63 _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) 64 65 #endif /* __ASSEMBLY__ */ 66 67 #else /* CONFIG_MMU */ 68 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) 69 #endif /* CONFIG_MMU */ 70 71 #endif /* __ASM_ASM_EXTABLE_H */ 72