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-rw-r--r--tools/bpf/bpftool/btf_dumper.c251
-rw-r--r--tools/bpf/bpftool/main.h15
2 files changed, 266 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/btf_dumper.c b/tools/bpf/bpftool/btf_dumper.c
new file mode 100644
index 000000000000..55bc512a1831
--- /dev/null
+++ b/tools/bpf/bpftool/btf_dumper.c
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2018 Facebook */
+
+#include <ctype.h>
+#include <stdio.h> /* for (FILE *) used by json_writer */
+#include <string.h>
+#include <asm/byteorder.h>
+#include <linux/bitops.h>
+#include <linux/btf.h>
+#include <linux/err.h>
+
+#include "btf.h"
+#include "json_writer.h"
+#include "main.h"
+
+#define BITS_PER_BYTE_MASK (BITS_PER_BYTE - 1)
+#define BITS_PER_BYTE_MASKED(bits) ((bits) & BITS_PER_BYTE_MASK)
+#define BITS_ROUNDDOWN_BYTES(bits) ((bits) >> 3)
+#define BITS_ROUNDUP_BYTES(bits) \
+ (BITS_ROUNDDOWN_BYTES(bits) + !!BITS_PER_BYTE_MASKED(bits))
+
+static int btf_dumper_do_type(const struct btf_dumper *d, __u32 type_id,
+ __u8 bit_offset, const void *data);
+
+static void btf_dumper_ptr(const void *data, json_writer_t *jw,
+ bool is_plain_text)
+{
+ if (is_plain_text)
+ jsonw_printf(jw, "%p", *(unsigned long *)data);
+ else
+ jsonw_printf(jw, "%u", *(unsigned long *)data);
+}
+
+static int btf_dumper_modifier(const struct btf_dumper *d, __u32 type_id,
+ const void *data)
+{
+ int actual_type_id;
+
+ actual_type_id = btf__resolve_type(d->btf, type_id);
+ if (actual_type_id < 0)
+ return actual_type_id;
+
+ return btf_dumper_do_type(d, actual_type_id, 0, data);
+}
+
+static void btf_dumper_enum(const void *data, json_writer_t *jw)
+{
+ jsonw_printf(jw, "%d", *(int *)data);
+}
+
+static int btf_dumper_array(const struct btf_dumper *d, __u32 type_id,
+ const void *data)
+{
+ const struct btf_type *t = btf__type_by_id(d->btf, type_id);
+ struct btf_array *arr = (struct btf_array *)(t + 1);
+ long long elem_size;
+ int ret = 0;
+ __u32 i;
+
+ elem_size = btf__resolve_size(d->btf, arr->type);
+ if (elem_size < 0)
+ return elem_size;
+
+ jsonw_start_array(d->jw);
+ for (i = 0; i < arr->nelems; i++) {
+ ret = btf_dumper_do_type(d, arr->type, 0,
+ data + i * elem_size);
+ if (ret)
+ break;
+ }
+
+ jsonw_end_array(d->jw);
+ return ret;
+}
+
+static void btf_dumper_int_bits(__u32 int_type, __u8 bit_offset,
+ const void *data, json_writer_t *jw,
+ bool is_plain_text)
+{
+ int left_shift_bits, right_shift_bits;
+ int nr_bits = BTF_INT_BITS(int_type);
+ int total_bits_offset;
+ int bytes_to_copy;
+ int bits_to_copy;
+ __u64 print_num;
+
+ total_bits_offset = bit_offset + BTF_INT_OFFSET(int_type);
+ data += BITS_ROUNDDOWN_BYTES(total_bits_offset);
+ bit_offset = BITS_PER_BYTE_MASKED(total_bits_offset);
+ bits_to_copy = bit_offset + nr_bits;
+ bytes_to_copy = BITS_ROUNDUP_BYTES(bits_to_copy);
+
+ print_num = 0;
+ memcpy(&print_num, data, bytes_to_copy);
+#if defined(__BIG_ENDIAN_BITFIELD)
+ left_shift_bits = bit_offset;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+ left_shift_bits = 64 - bits_to_copy;
+#else
+#error neither big nor little endian
+#endif
+ right_shift_bits = 64 - nr_bits;
+
+ print_num <<= left_shift_bits;
+ print_num >>= right_shift_bits;
+ if (is_plain_text)
+ jsonw_printf(jw, "0x%llx", print_num);
+ else
+ jsonw_printf(jw, "%llu", print_num);
+}
+
+static int btf_dumper_int(const struct btf_type *t, __u8 bit_offset,
+ const void *data, json_writer_t *jw,
+ bool is_plain_text)
+{
+ __u32 *int_type;
+ __u32 nr_bits;
+
+ int_type = (__u32 *)(t + 1);
+ nr_bits = BTF_INT_BITS(*int_type);
+ /* if this is bit field */
+ if (bit_offset || BTF_INT_OFFSET(*int_type) ||
+ BITS_PER_BYTE_MASKED(nr_bits)) {
+ btf_dumper_int_bits(*int_type, bit_offset, data, jw,
+ is_plain_text);
+ return 0;
+ }
+
+ switch (BTF_INT_ENCODING(*int_type)) {
+ case 0:
+ if (BTF_INT_BITS(*int_type) == 64)
+ jsonw_printf(jw, "%lu", *(__u64 *)data);
+ else if (BTF_INT_BITS(*int_type) == 32)
+ jsonw_printf(jw, "%u", *(__u32 *)data);
+ else if (BTF_INT_BITS(*int_type) == 16)
+ jsonw_printf(jw, "%hu", *(__u16 *)data);
+ else if (BTF_INT_BITS(*int_type) == 8)
+ jsonw_printf(jw, "%hhu", *(__u8 *)data);
+ else
+ btf_dumper_int_bits(*int_type, bit_offset, data, jw,
+ is_plain_text);
+ break;
+ case BTF_INT_SIGNED:
+ if (BTF_INT_BITS(*int_type) == 64)
+ jsonw_printf(jw, "%ld", *(long long *)data);
+ else if (BTF_INT_BITS(*int_type) == 32)
+ jsonw_printf(jw, "%d", *(int *)data);
+ else if (BTF_INT_BITS(*int_type) == 16)
+ jsonw_printf(jw, "%hd", *(short *)data);
+ else if (BTF_INT_BITS(*int_type) == 8)
+ jsonw_printf(jw, "%hhd", *(char *)data);
+ else
+ btf_dumper_int_bits(*int_type, bit_offset, data, jw,
+ is_plain_text);
+ break;
+ case BTF_INT_CHAR:
+ if (isprint(*(char *)data))
+ jsonw_printf(jw, "\"%c\"", *(char *)data);
+ else
+ if (is_plain_text)
+ jsonw_printf(jw, "0x%hhx", *(char *)data);
+ else
+ jsonw_printf(jw, "\"\\u00%02hhx\"",
+ *(char *)data);
+ break;
+ case BTF_INT_BOOL:
+ jsonw_bool(jw, *(int *)data);
+ break;
+ default:
+ /* shouldn't happen */
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int btf_dumper_struct(const struct btf_dumper *d, __u32 type_id,
+ const void *data)
+{
+ const struct btf_type *t;
+ struct btf_member *m;
+ const void *data_off;
+ int ret = 0;
+ int i, vlen;
+
+ t = btf__type_by_id(d->btf, type_id);
+ if (!t)
+ return -EINVAL;
+
+ vlen = BTF_INFO_VLEN(t->info);
+ jsonw_start_object(d->jw);
+ m = (struct btf_member *)(t + 1);
+
+ for (i = 0; i < vlen; i++) {
+ data_off = data + BITS_ROUNDDOWN_BYTES(m[i].offset);
+ jsonw_name(d->jw, btf__name_by_offset(d->btf, m[i].name_off));
+ ret = btf_dumper_do_type(d, m[i].type,
+ BITS_PER_BYTE_MASKED(m[i].offset),
+ data_off);
+ if (ret)
+ break;
+ }
+
+ jsonw_end_object(d->jw);
+
+ return ret;
+}
+
+static int btf_dumper_do_type(const struct btf_dumper *d, __u32 type_id,
+ __u8 bit_offset, const void *data)
+{
+ const struct btf_type *t = btf__type_by_id(d->btf, type_id);
+
+ switch (BTF_INFO_KIND(t->info)) {
+ case BTF_KIND_INT:
+ return btf_dumper_int(t, bit_offset, data, d->jw,
+ d->is_plain_text);
+ case BTF_KIND_STRUCT:
+ case BTF_KIND_UNION:
+ return btf_dumper_struct(d, type_id, data);
+ case BTF_KIND_ARRAY:
+ return btf_dumper_array(d, type_id, data);
+ case BTF_KIND_ENUM:
+ btf_dumper_enum(data, d->jw);
+ return 0;
+ case BTF_KIND_PTR:
+ btf_dumper_ptr(data, d->jw, d->is_plain_text);
+ return 0;
+ case BTF_KIND_UNKN:
+ jsonw_printf(d->jw, "(unknown)");
+ return 0;
+ case BTF_KIND_FWD:
+ /* map key or value can't be forward */
+ jsonw_printf(d->jw, "(fwd-kind-invalid)");
+ return -EINVAL;
+ case BTF_KIND_TYPEDEF:
+ case BTF_KIND_VOLATILE:
+ case BTF_KIND_CONST:
+ case BTF_KIND_RESTRICT:
+ return btf_dumper_modifier(d, type_id, data);
+ default:
+ jsonw_printf(d->jw, "(unsupported-kind");
+ return -EINVAL;
+ }
+}
+
+int btf_dumper_type(const struct btf_dumper *d, __u32 type_id,
+ const void *data)
+{
+ return btf_dumper_do_type(d, type_id, 0, data);
+}
diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h
index 41004bb2644a..238e734d75b3 100644
--- a/tools/bpf/bpftool/main.h
+++ b/tools/bpf/bpftool/main.h
@@ -150,4 +150,19 @@ unsigned int get_page_size(void);
unsigned int get_possible_cpus(void);
const char *ifindex_to_bfd_name_ns(__u32 ifindex, __u64 ns_dev, __u64 ns_ino);
+struct btf_dumper {
+ const struct btf *btf;
+ json_writer_t *jw;
+ bool is_plain_text;
+};
+
+/* btf_dumper_type - print data along with type information
+ * @d: an instance containing context for dumping types
+ * @type_id: index in btf->types array. this points to the type to be dumped
+ * @data: pointer the actual data, i.e. the values to be printed
+ *
+ * Returns zero on success and negative error code otherwise
+ */
+int btf_dumper_type(const struct btf_dumper *d, __u32 type_id,
+ const void *data);
#endif
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-03 22:43:36 +0300