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Mon, 19 Jul 2021 21:41:36 +0000 From: Alan Maguire To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org Cc: kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, morbo@google.com, shuah@kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Alan Maguire Subject: [PATCH bpf-next 1/3] libbpf: avoid use of __int128 in typed dump display Date: Mon, 19 Jul 2021 22:41:27 +0100 Message-Id: <1626730889-5658-2-git-send-email-alan.maguire@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1626730889-5658-1-git-send-email-alan.maguire@oracle.com> References: <1626730889-5658-1-git-send-email-alan.maguire@oracle.com> Content-Type: text/plain X-ClientProxiedBy: DU2PR04CA0278.eurprd04.prod.outlook.com (2603:10a6:10:28c::13) To BLAPR10MB5267.namprd10.prod.outlook.com (2603:10b6:208:30e::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (95.45.14.174) by DU2PR04CA0278.eurprd04.prod.outlook.com (2603:10a6:10:28c::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4331.21 via Frontend Transport; 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With these changes, a big-endian issue with casting 128-bit integers to 64-bit for enum bitfields is solved also, as we now use 64-bit integers for bitfield calculations. Reported-by: Naresh Kamboju Reported-by: Linux Kernel Functional Testing Signed-off-by: Alan Maguire --- tools/lib/bpf/btf_dump.c | 62 +++++++++++++++++++++++++++--------------------- 1 file changed, 35 insertions(+), 27 deletions(-) diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c index accf6fe..4a25512 100644 --- a/tools/lib/bpf/btf_dump.c +++ b/tools/lib/bpf/btf_dump.c @@ -1552,28 +1552,15 @@ static int btf_dump_unsupported_data(struct btf_dump *d, return -ENOTSUP; } -static void btf_dump_int128(struct btf_dump *d, - const struct btf_type *t, - const void *data) -{ - __int128 num = *(__int128 *)data; - - if ((num >> 64) == 0) - btf_dump_type_values(d, "0x%llx", (long long)num); - else - btf_dump_type_values(d, "0x%llx%016llx", (long long)num >> 32, - (long long)num); -} - -static unsigned __int128 btf_dump_bitfield_get_data(struct btf_dump *d, - const struct btf_type *t, - const void *data, - __u8 bits_offset, - __u8 bit_sz) +static __u64 btf_dump_bitfield_get_data(struct btf_dump *d, + const struct btf_type *t, + const void *data, + __u8 bits_offset, + __u8 bit_sz) { __u16 left_shift_bits, right_shift_bits; __u8 nr_copy_bits, nr_copy_bytes; - unsigned __int128 num = 0, ret; + __u64 num = 0, ret; const __u8 *bytes = data; int i; @@ -1591,8 +1578,8 @@ static unsigned __int128 btf_dump_bitfield_get_data(struct btf_dump *d, #else # error "Unrecognized __BYTE_ORDER__" #endif - left_shift_bits = 128 - nr_copy_bits; - right_shift_bits = 128 - bit_sz; + left_shift_bits = 64 - nr_copy_bits; + right_shift_bits = 64 - bit_sz; ret = (num << left_shift_bits) >> right_shift_bits; @@ -1605,7 +1592,7 @@ static int btf_dump_bitfield_check_zero(struct btf_dump *d, __u8 bits_offset, __u8 bit_sz) { - __int128 check_num; + __u64 check_num; check_num = btf_dump_bitfield_get_data(d, t, data, bits_offset, bit_sz); if (check_num == 0) @@ -1619,10 +1606,11 @@ static int btf_dump_bitfield_data(struct btf_dump *d, __u8 bits_offset, __u8 bit_sz) { - unsigned __int128 print_num; + __u64 print_num; print_num = btf_dump_bitfield_get_data(d, t, data, bits_offset, bit_sz); - btf_dump_int128(d, t, &print_num); + + btf_dump_type_values(d, "0x%llx", (unsigned long long)print_num); return 0; } @@ -1681,9 +1669,29 @@ static int btf_dump_int_data(struct btf_dump *d, return btf_dump_bitfield_data(d, t, data, 0, 0); switch (sz) { - case 16: - btf_dump_int128(d, t, data); + case 16: { + const __u64 *ints = data; + __u64 lsi, msi; + + /* avoid use of __int128 as some 32-bit platforms do not + * support it. + */ +#if __BYTE_ORDER == __LITTLE_ENDIAN + lsi = ints[0]; + msi = ints[1]; +#elif __BYTE_ORDER == __BIG_ENDIAN + lsi = ints[1]; + msi = ints[0]; +#else +# error "Unrecognized __BYTE_ORDER__" +#endif + if (msi == 0) + btf_dump_type_values(d, "0x%llx", (unsigned long long)lsi); + else + btf_dump_type_values(d, "0x%llx%016llx", (unsigned long long)msi, + (unsigned long long)lsi); break; + } case 8: if (sign) btf_dump_type_values(d, "%lld", *(long long *)data); @@ -2209,7 +2217,7 @@ static int btf_dump_dump_type_data(struct btf_dump *d, case BTF_KIND_ENUM: /* handle bitfield and int enum values */ if (bit_sz) { - unsigned __int128 print_num; + __u64 print_num; __s64 enum_val; print_num = btf_dump_bitfield_get_data(d, t, data, bits_offset, bit_sz); -- 1.8.3.1