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/* SPDX-License-Identifier: BSD-3-Clause * Copyright 2016-2018 NXP * Copyright (c) 2018-2019, Vladimir Oltean <olteanv@gmail.com> */ #ifndef _LINUX_PACKING_H #define _LINUX_PACKING_H #include <linux/types.h> #include <linux/bitops.h> #define GEN_PACKED_FIELD_STRUCT(__type) \ struct packed_field_ ## __type { \ __type startbit; \ __type endbit; \ __type offset; \ __type size; \ } /* struct packed_field_u8. Use with bit offsets < 256, buffers < 32B and * unpacked structures < 256B. */ GEN_PACKED_FIELD_STRUCT(u8); /* struct packed_field_u16. Use with bit offsets < 65536, buffers < 8KB and * unpacked structures < 64KB. */ GEN_PACKED_FIELD_STRUCT(u16); #define PACKED_FIELD(start, end, struct_name, struct_field) \ { \ (start), \ (end), \ offsetof(struct_name, struct_field), \ sizeof_field(struct_name, struct_field), \ } #define CHECK_PACKED_FIELD_OVERLAP(fields, index1, index2) ({ \ typeof(&(fields)[0]) __f = (fields); \ typeof(__f[0]) _f1 = __f[index1]; typeof(__f[0]) _f2 = __f[index2]; \ const bool _ascending = __f[0].startbit < __f[1].startbit; \ BUILD_BUG_ON_MSG(_ascending && _f1.startbit >= _f2.startbit, \ __stringify(fields) " field " __stringify(index2) \ " breaks ascending order"); \ BUILD_BUG_ON_MSG(!_ascending && _f1.startbit <= _f2.startbit, \ __stringify(fields) " field " __stringify(index2) \ " breaks descending order"); \ BUILD_BUG_ON_MSG(max(_f1.endbit, _f2.endbit) <= \ min(_f1.startbit, _f2.startbit), \ __stringify(fields) " field " __stringify(index2) \ " overlaps with previous field"); \ }) #define CHECK_PACKED_FIELD(fields, index) ({ \ typeof(&(fields)[0]) _f = (fields); \ typeof(_f[0]) __f = _f[index]; \ BUILD_BUG_ON_MSG(__f.startbit < __f.endbit, \ __stringify(fields) " field " __stringify(index) \ " start bit must not be smaller than end bit"); \ BUILD_BUG_ON_MSG(__f.size != 1 && __f.size != 2 && \ __f.size != 4 && __f.size != 8, \ __stringify(fields) " field " __stringify(index) \ " has unsupported unpacked storage size"); \ BUILD_BUG_ON_MSG(__f.startbit - __f.endbit >= BITS_PER_BYTE * __f.size, \ __stringify(fields) " field " __stringify(index) \ " exceeds unpacked storage size"); \ __builtin_choose_expr(index != 0, \ CHECK_PACKED_FIELD_OVERLAP(fields, index - 1, index), \ 1); \ }) /* Note that the packed fields may be either in ascending or descending order. * Thus, we must check that both the first and last field wit within the * packed buffer size. */ #define CHECK_PACKED_FIELDS_SIZE(fields, pbuflen) ({ \ typeof(&(fields)[0]) _f = (fields); \ typeof(pbuflen) _len = (pbuflen); \ const size_t num_fields = ARRAY_SIZE(fields); \ BUILD_BUG_ON_MSG(!__builtin_constant_p(_len), \ __stringify(fields) " pbuflen " __stringify(pbuflen) \ " must be a compile time constant"); \ BUILD_BUG_ON_MSG(_f[0].startbit >= BITS_PER_BYTE * _len, \ __stringify(fields) " first field exceeds packed buffer size"); \ BUILD_BUG_ON_MSG(_f[num_fields - 1].startbit >= BITS_PER_BYTE * _len, \ __stringify(fields) " last field exceeds packed buffer size"); \ }) #define QUIRK_MSB_ON_THE_RIGHT BIT(0) #define QUIRK_LITTLE_ENDIAN BIT(1) #define QUIRK_LSW32_IS_FIRST BIT(2) enum packing_op { PACK, UNPACK, }; int packing(void *pbuf, u64 *uval, int startbit, int endbit, size_t pbuflen, enum packing_op op, u8 quirks); int pack(void *pbuf, u64 uval, size_t startbit, size_t endbit, size_t pbuflen, u8 quirks); int unpack(const void *pbuf, u64 *uval, size_t startbit, size_t endbit, size_t pbuflen, u8 quirks); void pack_fields_u8(void *pbuf, size_t pbuflen, const void *ustruct, const struct packed_field_u8 *fields, size_t num_fields, u8 quirks); void pack_fields_u16(void *pbuf, size_t pbuflen, const void *ustruct, const struct packed_field_u16 *fields, size_t num_fields, u8 quirks); void unpack_fields_u8(const void *pbuf, size_t pbuflen, void *ustruct, const struct packed_field_u8 *fields, size_t num_fields, u8 quirks); void unpack_fields_u16(const void *pbuf, size_t pbuflen, void *ustruct, const struct packed_field_u16 *fields, size_t num_fields, u8 quirks); /* Do not hand-edit the following packed field check macros! * * They are generated using scripts/gen_packed_field_checks.c, which may be * built via "make scripts_gen_packed_field_checks". If larger macro sizes are * needed in the future, please use this program to re-generate the macros and * insert them here. */ #define CHECK_PACKED_FIELDS_1(fields) \ CHECK_PACKED_FIELD(fields, 0) #define CHECK_PACKED_FIELDS_2(fields) do { \ CHECK_PACKED_FIELDS_1(fields); \ CHECK_PACKED_FIELD(fields, 1); \ } while (0) #define CHECK_PACKED_FIELDS_3(fields) do { \ CHECK_PACKED_FIELDS_2(fields); \ CHECK_PACKED_FIELD(fields, 2); \ } while (0) #define CHECK_PACKED_FIELDS_4(fields) do { \ CHECK_PACKED_FIELDS_3(fields); \ CHECK_PACKED_FIELD(fields, 3); \ } while (0) #define CHECK_PACKED_FIELDS_5(fields) do { \ CHECK_PACKED_FIELDS_4(fields); \ CHECK_PACKED_FIELD(fields, 4); \ } while (0) #define CHECK_PACKED_FIELDS_6(fields) do { \ CHECK_PACKED_FIELDS_5(fields); \ CHECK_PACKED_FIELD(fields, 5); \ } while (0) #define CHECK_PACKED_FIELDS_7(fields) do { \ CHECK_PACKED_FIELDS_6(fields); \ CHECK_PACKED_FIELD(fields, 6); \ } while (0) #define CHECK_PACKED_FIELDS_8(fields) do { \ CHECK_PACKED_FIELDS_7(fields); \ CHECK_PACKED_FIELD(fields, 7); \ } while (0) #define CHECK_PACKED_FIELDS_9(fields) do { \ CHECK_PACKED_FIELDS_8(fields); \ CHECK_PACKED_FIELD(fields, 8); \ } while (0) #define CHECK_PACKED_FIELDS_10(fields) do { \ CHECK_PACKED_FIELDS_9(fields); \ CHECK_PACKED_FIELD(fields, 9); \ } while (0) #define CHECK_PACKED_FIELDS_11(fields) do { \ CHECK_PACKED_FIELDS_10(fields); \ CHECK_PACKED_FIELD(fields, 10); \ } while (0) #define CHECK_PACKED_FIELDS_12(fields) do { \ CHECK_PACKED_FIELDS_11(fields); \ CHECK_PACKED_FIELD(fields, 11); \ } while (0) #define CHECK_PACKED_FIELDS_13(fields) do { \ CHECK_PACKED_FIELDS_12(fields); \ CHECK_PACKED_FIELD(fields, 12); \ } while (0) #define CHECK_PACKED_FIELDS_14(fields) do { \ CHECK_PACKED_FIELDS_13(fields); \ CHECK_PACKED_FIELD(fields, 13); \ } while (0) #define CHECK_PACKED_FIELDS_15(fields) do { \ CHECK_PACKED_FIELDS_14(fields); \ CHECK_PACKED_FIELD(fields, 14); \ } while (0) #define CHECK_PACKED_FIELDS_16(fields) do { \ CHECK_PACKED_FIELDS_15(fields); \ CHECK_PACKED_FIELD(fields, 15); \ } while (0) #define CHECK_PACKED_FIELDS_17(fields) do { \ CHECK_PACKED_FIELDS_16(fields); \ CHECK_PACKED_FIELD(fields, 16); \ } while (0) #define CHECK_PACKED_FIELDS_18(fields) do { \ CHECK_PACKED_FIELDS_17(fields); \ CHECK_PACKED_FIELD(fields, 17); \ } while (0) #define CHECK_PACKED_FIELDS_19(fields) do { \ CHECK_PACKED_FIELDS_18(fields); \ CHECK_PACKED_FIELD(fields, 18); \ } while (0) #define CHECK_PACKED_FIELDS_20(fields) do { \ CHECK_PACKED_FIELDS_19(fields); \ CHECK_PACKED_FIELD(fields, 19); \ } while (0) #define CHECK_PACKED_FIELDS_21(fields) do { \ CHECK_PACKED_FIELDS_20(fields); \ CHECK_PACKED_FIELD(fields, 20); \ } while (0) #define CHECK_PACKED_FIELDS_22(fields) do { \ CHECK_PACKED_FIELDS_21(fields); \ CHECK_PACKED_FIELD(fields, 21); \ } while (0) #define CHECK_PACKED_FIELDS_23(fields) do { \ CHECK_PACKED_FIELDS_22(fields); \ CHECK_PACKED_FIELD(fields, 22); \ } while (0) #define CHECK_PACKED_FIELDS_24(fields) do { \ CHECK_PACKED_FIELDS_23(fields); \ CHECK_PACKED_FIELD(fields, 23); \ } while (0) #define CHECK_PACKED_FIELDS_25(fields) do { \ CHECK_PACKED_FIELDS_24(fields); \ CHECK_PACKED_FIELD(fields, 24); \ } while (0) #define CHECK_PACKED_FIELDS_26(fields) do { \ CHECK_PACKED_FIELDS_25(fields); \ CHECK_PACKED_FIELD(fields, 25); \ } while (0) #define CHECK_PACKED_FIELDS_27(fields) do { \ CHECK_PACKED_FIELDS_26(fields); \ CHECK_PACKED_FIELD(fields, 26); \ } while (0) #define CHECK_PACKED_FIELDS_28(fields) do { \ CHECK_PACKED_FIELDS_27(fields); \ CHECK_PACKED_FIELD(fields, 27); \ } while (0) #define CHECK_PACKED_FIELDS_29(fields) do { \ CHECK_PACKED_FIELDS_28(fields); \ CHECK_PACKED_FIELD(fields, 28); \ } while (0) #define CHECK_PACKED_FIELDS_30(fields) do { \ CHECK_PACKED_FIELDS_29(fields); \ CHECK_PACKED_FIELD(fields, 29); \ } while (0) #define CHECK_PACKED_FIELDS_31(fields) do { \ CHECK_PACKED_FIELDS_30(fields); \ CHECK_PACKED_FIELD(fields, 30); \ } while (0) #define CHECK_PACKED_FIELDS_32(fields) do { \ CHECK_PACKED_FIELDS_31(fields); \ CHECK_PACKED_FIELD(fields, 31); \ } while (0) #define CHECK_PACKED_FIELDS_33(fields) do { \ CHECK_PACKED_FIELDS_32(fields); \ CHECK_PACKED_FIELD(fields, 32); \ } while (0) #define CHECK_PACKED_FIELDS_34(fields) do { \ CHECK_PACKED_FIELDS_33(fields); \ CHECK_PACKED_FIELD(fields, 33); \ } while (0) #define CHECK_PACKED_FIELDS_35(fields) do { \ CHECK_PACKED_FIELDS_34(fields); \ CHECK_PACKED_FIELD(fields, 34); \ } while (0) #define CHECK_PACKED_FIELDS_36(fields) do { \ CHECK_PACKED_FIELDS_35(fields); \ CHECK_PACKED_FIELD(fields, 35); \ } while (0) #define CHECK_PACKED_FIELDS_37(fields) do { \ CHECK_PACKED_FIELDS_36(fields); \ CHECK_PACKED_FIELD(fields, 36); \ } while (0) #define CHECK_PACKED_FIELDS_38(fields) do { \ CHECK_PACKED_FIELDS_37(fields); \ CHECK_PACKED_FIELD(fields, 37); \ } while (0) #define CHECK_PACKED_FIELDS_39(fields) do { \ CHECK_PACKED_FIELDS_38(fields); \ CHECK_PACKED_FIELD(fields, 38); \ } while (0) #define CHECK_PACKED_FIELDS_40(fields) do { \ CHECK_PACKED_FIELDS_39(fields); \ CHECK_PACKED_FIELD(fields, 39); \ } while (0) #define CHECK_PACKED_FIELDS_41(fields) do { \ CHECK_PACKED_FIELDS_40(fields); \ CHECK_PACKED_FIELD(fields, 40); \ } while (0) #define CHECK_PACKED_FIELDS_42(fields) do { \ CHECK_PACKED_FIELDS_41(fields); \ CHECK_PACKED_FIELD(fields, 41); \ } while (0) #define CHECK_PACKED_FIELDS_43(fields) do { \ CHECK_PACKED_FIELDS_42(fields); \ CHECK_PACKED_FIELD(fields, 42); \ } while (0) #define CHECK_PACKED_FIELDS_44(fields) do { \ CHECK_PACKED_FIELDS_43(fields); \ CHECK_PACKED_FIELD(fields, 43); \ } while (0) #define CHECK_PACKED_FIELDS_45(fields) do { \ CHECK_PACKED_FIELDS_44(fields); \ CHECK_PACKED_FIELD(fields, 44); \ } while (0) #define CHECK_PACKED_FIELDS_46(fields) do { \ CHECK_PACKED_FIELDS_45(fields); \ CHECK_PACKED_FIELD(fields, 45); \ } while (0) #define CHECK_PACKED_FIELDS_47(fields) do { \ CHECK_PACKED_FIELDS_46(fields); \ CHECK_PACKED_FIELD(fields, 46); \ } while (0) #define CHECK_PACKED_FIELDS_48(fields) do { \ CHECK_PACKED_FIELDS_47(fields); \ CHECK_PACKED_FIELD(fields, 47); \ } while (0) #define CHECK_PACKED_FIELDS_49(fields) do { \ CHECK_PACKED_FIELDS_48(fields); \ CHECK_PACKED_FIELD(fields, 48); \ } while (0) #define CHECK_PACKED_FIELDS_50(fields) do { \ CHECK_PACKED_FIELDS_49(fields); \ CHECK_PACKED_FIELD(fields, 49); \ } while (0) #define CHECK_PACKED_FIELDS(fields) \ __builtin_choose_expr(ARRAY_SIZE(fields) == 1, ({ CHECK_PACKED_FIELDS_1(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 2, ({ CHECK_PACKED_FIELDS_2(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 3, ({ CHECK_PACKED_FIELDS_3(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 4, ({ CHECK_PACKED_FIELDS_4(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 5, ({ CHECK_PACKED_FIELDS_5(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 6, ({ CHECK_PACKED_FIELDS_6(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 7, ({ CHECK_PACKED_FIELDS_7(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 8, ({ CHECK_PACKED_FIELDS_8(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 9, ({ CHECK_PACKED_FIELDS_9(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 10, ({ CHECK_PACKED_FIELDS_10(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 11, ({ CHECK_PACKED_FIELDS_11(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 12, ({ CHECK_PACKED_FIELDS_12(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 13, ({ CHECK_PACKED_FIELDS_13(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 14, ({ CHECK_PACKED_FIELDS_14(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 15, ({ CHECK_PACKED_FIELDS_15(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 16, ({ CHECK_PACKED_FIELDS_16(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 17, ({ CHECK_PACKED_FIELDS_17(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 18, ({ CHECK_PACKED_FIELDS_18(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 19, ({ CHECK_PACKED_FIELDS_19(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 20, ({ CHECK_PACKED_FIELDS_20(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 21, ({ CHECK_PACKED_FIELDS_21(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 22, ({ CHECK_PACKED_FIELDS_22(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 23, ({ CHECK_PACKED_FIELDS_23(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 24, ({ CHECK_PACKED_FIELDS_24(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 25, ({ CHECK_PACKED_FIELDS_25(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 26, ({ CHECK_PACKED_FIELDS_26(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 27, ({ CHECK_PACKED_FIELDS_27(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 28, ({ CHECK_PACKED_FIELDS_28(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 29, ({ CHECK_PACKED_FIELDS_29(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 30, ({ CHECK_PACKED_FIELDS_30(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 31, ({ CHECK_PACKED_FIELDS_31(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 32, ({ CHECK_PACKED_FIELDS_32(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 33, ({ CHECK_PACKED_FIELDS_33(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 34, ({ CHECK_PACKED_FIELDS_34(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 35, ({ CHECK_PACKED_FIELDS_35(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 36, ({ CHECK_PACKED_FIELDS_36(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 37, ({ CHECK_PACKED_FIELDS_37(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 38, ({ CHECK_PACKED_FIELDS_38(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 39, ({ CHECK_PACKED_FIELDS_39(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 40, ({ CHECK_PACKED_FIELDS_40(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 41, ({ CHECK_PACKED_FIELDS_41(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 42, ({ CHECK_PACKED_FIELDS_42(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 43, ({ CHECK_PACKED_FIELDS_43(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 44, ({ CHECK_PACKED_FIELDS_44(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 45, ({ CHECK_PACKED_FIELDS_45(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 46, ({ CHECK_PACKED_FIELDS_46(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 47, ({ CHECK_PACKED_FIELDS_47(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 48, ({ CHECK_PACKED_FIELDS_48(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 49, ({ CHECK_PACKED_FIELDS_49(fields); }), \ __builtin_choose_expr(ARRAY_SIZE(fields) == 50, ({ CHECK_PACKED_FIELDS_50(fields); }), \ ({ BUILD_BUG_ON_MSG(1, "CHECK_PACKED_FIELDS() must be regenerated to support array sizes larger than 50."); }) \ )))))))))))))))))))))))))))))))))))))))))))))))))) /* End of generated content */ #define pack_fields(pbuf, pbuflen, ustruct, fields, quirks) \ ({ \ CHECK_PACKED_FIELDS(fields); \ CHECK_PACKED_FIELDS_SIZE((fields), (pbuflen)); \ _Generic((fields), \ const struct packed_field_u8 * : pack_fields_u8, \ const struct packed_field_u16 * : pack_fields_u16 \ )((pbuf), (pbuflen), (ustruct), (fields), ARRAY_SIZE(fields), (quirks)); \ }) #define unpack_fields(pbuf, pbuflen, ustruct, fields, quirks) \ ({ \ CHECK_PACKED_FIELDS(fields); \ CHECK_PACKED_FIELDS_SIZE((fields), (pbuflen)); \ _Generic((fields), \ const struct packed_field_u8 * : unpack_fields_u8, \ const struct packed_field_u16 * : unpack_fields_u16 \ )((pbuf), (pbuflen), (ustruct), (fields), ARRAY_SIZE(fields), (quirks)); \ }) #endif