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/* btfext-out.h - Declarations and definitions related to
BPF Compile Once - Run Everywhere (CO-RE) support.
Copyright (C) 2021-2025 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef __COREOUT_H
#define __COREOUT_H
#include <stdint.h>
#include "ctfc.h"
#ifdef __cplusplus
extern "C"
{
#endif
/* .BTF.ext information. */
struct btf_ext_section_header
{
uint32_t sec_name_off;
uint32_t num_records;
};
enum btf_core_reloc_kind
{
BPF_RELO_INVALID = -1,
BPF_RELO_FIELD_BYTE_OFFSET = 0,
BPF_RELO_FIELD_BYTE_SIZE = 1,
BPF_RELO_FIELD_EXISTS = 2,
BPF_RELO_FIELD_SIGNED = 3,
BPF_RELO_FIELD_LSHIFT_U64 = 4,
BPF_RELO_FIELD_RSHIFT_U64 = 5,
BPF_RELO_TYPE_ID_LOCAL = 6,
BPF_RELO_TYPE_ID_TARGET = 7,
BPF_RELO_TYPE_EXISTS = 8,
BPF_RELO_TYPE_SIZE = 9,
BPF_RELO_ENUMVAL_EXISTS = 10,
BPF_RELO_ENUMVAL_VALUE = 11,
BPF_RELO_TYPE_MATCHES = 12
};
struct btf_ext_reloc
{
uint32_t insn_off; /* Offset of instruction to be patched. A
section-relative label at compile time. */
uint32_t type_id; /* Type ID of the outermost containing entity, e.g.
the containing structure. */
uint32_t access_str_off; /* Offset of CO-RE accessor string in .BTF strings
section. */
uint32_t kind; /* An enum btf_core_reloc_kind. Note that it always
takes 32 bits. */
};
struct btf_ext_header
{
uint16_t magic; /* Magic number (BTF_MAGIC). */
uint8_t version; /* Data format version (BTF_VERSION). */
uint8_t flags; /* Flags. Currently unused. */
uint32_t hdr_len; /* Length of this header in bytes. */
/* Following offsets are relative to the end of this header, in bytes.
Following lengths are in bytes. */
uint32_t func_info_off; /* Offset of funcinfo section. */
uint32_t func_info_len; /* Length of funcinfo section. */
uint32_t line_info_off; /* Offset of lineinfo section. */
uint32_t line_info_len; /* Length of lineinfo section. */
uint32_t core_relo_off; /* Offset of CO-RE relocation section. */
uint32_t core_relo_len; /* Length of CO-RE relocation section. */
};
extern void btf_ext_init (void);
extern void btf_ext_output (void);
void
bpf_core_reloc_add (const tree type, const char * section_name,
const char *accessor,
rtx_code_label *label,
enum btf_core_reloc_kind kind);
extern int bpf_core_get_sou_member_index (ctf_container_ref, const tree);
struct btf_ext_funcinfo *btf_add_func_info_for (tree decl,
const char *label);
unsigned int btf_ext_add_string (const char *str);
#ifdef __cplusplus
}
#endif
#endif /* __COREOUT_H */
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