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