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/* plugin-api.h -- External linker plugin API. */ |
| 2 |
|
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/* Copyright (C) 2009-2021 Free Software Foundation, Inc. |
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Written by Cary Coutant <ccoutant@google.com>. |
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|
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This file is part of binutils. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
| 19 |
along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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MA 02110-1301, USA. */ |
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|
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/* This file defines the interface for writing a linker plugin, which is |
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described at < http://gcc.gnu.org/wiki/whopr/driver >. */ |
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|
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#ifndef PLUGIN_API_H |
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#define PLUGIN_API_H |
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|
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#ifdef HAVE_STDINT_H |
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#include <stdint.h> |
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#elif defined(HAVE_INTTYPES_H) |
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#include <inttypes.h> |
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#endif |
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#include <sys/types.h> |
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#if !defined(HAVE_STDINT_H) && !defined(HAVE_INTTYPES_H) && \ |
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!defined(UINT64_MAX) && !defined(uint64_t) |
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#error cannot find uint64_t type |
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#endif |
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|
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/* Detect endianess based on __BYTE_ORDER__ macro. */ |
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#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \ |
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defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_PDP_ENDIAN__) |
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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#define PLUGIN_LITTLE_ENDIAN 1 |
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#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
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#define PLUGIN_BIG_ENDIAN 1 |
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#elif __BYTE_ORDER__ == __ORDER_PDP_ENDIAN__ |
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#define PLUGIN_PDP_ENDIAN 1 |
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#endif |
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#else |
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/* Older GCC releases (<4.6.0) can make detection from glibc macros. */ |
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#if defined(__GLIBC__) || defined(__GNU_LIBRARY__) || defined(__ANDROID__) |
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#include <endian.h> |
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#ifdef __BYTE_ORDER |
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#if __BYTE_ORDER == __LITTLE_ENDIAN |
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#define PLUGIN_LITTLE_ENDIAN 1 |
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#elif __BYTE_ORDER == __BIG_ENDIAN |
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#define PLUGIN_BIG_ENDIAN 1 |
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#endif |
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#endif |
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#endif |
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/* Include all necessary header files based on target. */ |
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#if defined(__SVR4) && defined(__sun) |
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#include <sys/byteorder.h> |
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#endif |
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#if defined(__FreeBSD__) || defined(__NetBSD__) || \ |
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defined(__DragonFly__) || defined(__minix) |
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#include <sys/endian.h> |
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#endif |
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#if defined(__OpenBSD__) |
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#include <machine/endian.h> |
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#endif |
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/* Detect endianess based on _BYTE_ORDER. */ |
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#ifdef _BYTE_ORDER |
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#if _BYTE_ORDER == _LITTLE_ENDIAN |
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#define PLUGIN_LITTLE_ENDIAN 1 |
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#elif _BYTE_ORDER == _BIG_ENDIAN |
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#define PLUGIN_BIG_ENDIAN 1 |
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#endif |
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#endif |
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/* Detect based on _WIN32. */ |
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#if defined(_WIN32) |
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#define PLUGIN_LITTLE_ENDIAN 1 |
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#endif |
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/* Detect based on __BIG_ENDIAN__ and __LITTLE_ENDIAN__ */ |
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#ifdef __LITTLE_ENDIAN__ |
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#define PLUGIN_LITTLE_ENDIAN 1 |
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#endif |
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#ifdef __BIG_ENDIAN__ |
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#define PLUGIN_BIG_ENDIAN 1 |
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#endif |
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#endif |
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|
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#ifdef __cplusplus |
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extern "C" |
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{ |
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#endif |
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|
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/* Status code returned by most API routines. */ |
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|
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enum ld_plugin_status |
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{ |
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LDPS_OK = 0, |
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LDPS_NO_SYMS, /* Attempt to get symbols that haven't been added. */ |
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LDPS_BAD_HANDLE, /* No claimed object associated with given handle. */ |
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LDPS_ERR |
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/* Additional Error codes TBD. */ |
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}; |
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|
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/* The version of the API specification. */ |
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|
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enum ld_plugin_api_version |
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{ |
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LD_PLUGIN_API_VERSION = 1 |
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}; |
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|
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/* The type of output file being generated by the linker. */ |
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|
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enum ld_plugin_output_file_type |
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{ |
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LDPO_REL, |
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LDPO_EXEC, |
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LDPO_DYN, |
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LDPO_PIE |
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}; |
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|
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/* An input file managed by the plugin library. */ |
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|
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struct ld_plugin_input_file |
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{ |
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const char *name; |
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int fd; |
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off_t offset; |
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off_t filesize; |
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void *handle; |
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}; |
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|
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/* A symbol belonging to an input file managed by the plugin library. */ |
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|
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struct ld_plugin_symbol |
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{ |
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char *name; |
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char *version; |
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/* This is for compatibility with older ABIs. The older ABI defined |
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only 'def' field. */ |
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#if PLUGIN_BIG_ENDIAN == 1 |
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char unused; |
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char section_kind; |
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char symbol_type; |
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char def; |
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#elif PLUGIN_LITTLE_ENDIAN == 1 |
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char def; |
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char symbol_type; |
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char section_kind; |
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char unused; |
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#elif PLUGIN_PDP_ENDIAN == 1 |
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char symbol_type; |
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char def; |
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char unused; |
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char section_kind; |
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#else |
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#error "Could not detect architecture endianess" |
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#endif |
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int visibility; |
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uint64_t size; |
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char *comdat_key; |
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int resolution; |
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}; |
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|
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/* An object's section. */ |
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|
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struct ld_plugin_section |
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{ |
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const void* handle; |
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unsigned int shndx; |
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}; |
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|
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/* Whether the symbol is a definition, reference, or common, weak or not. */ |
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|
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enum ld_plugin_symbol_kind |
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{ |
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LDPK_DEF, |
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LDPK_WEAKDEF, |
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LDPK_UNDEF, |
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LDPK_WEAKUNDEF, |
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LDPK_COMMON |
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}; |
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|
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/* The visibility of the symbol. */ |
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|
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enum ld_plugin_symbol_visibility |
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{ |
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LDPV_DEFAULT, |
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LDPV_PROTECTED, |
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LDPV_INTERNAL, |
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LDPV_HIDDEN |
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}; |
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|
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/* The type of the symbol. */ |
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|
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enum ld_plugin_symbol_type |
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{ |
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LDST_UNKNOWN, |
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LDST_FUNCTION, |
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LDST_VARIABLE |
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}; |
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|
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enum ld_plugin_symbol_section_kind |
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{ |
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LDSSK_DEFAULT, |
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LDSSK_BSS |
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}; |
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|
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/* How a symbol is resolved. */ |
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|
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enum ld_plugin_symbol_resolution |
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{ |
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LDPR_UNKNOWN = 0, |
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|
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/* Symbol is still undefined at this point. */ |
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LDPR_UNDEF, |
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|
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/* This is the prevailing definition of the symbol, with references from |
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regular object code. */ |
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LDPR_PREVAILING_DEF, |
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|
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/* This is the prevailing definition of the symbol, with no |
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references from regular objects. It is only referenced from IR |
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code. */ |
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LDPR_PREVAILING_DEF_IRONLY, |
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|
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/* This definition was pre-empted by a definition in a regular |
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object file. */ |
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LDPR_PREEMPTED_REG, |
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|
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/* This definition was pre-empted by a definition in another IR file. */ |
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LDPR_PREEMPTED_IR, |
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|
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/* This symbol was resolved by a definition in another IR file. */ |
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LDPR_RESOLVED_IR, |
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|
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/* This symbol was resolved by a definition in a regular object |
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linked into the main executable. */ |
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LDPR_RESOLVED_EXEC, |
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|
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/* This symbol was resolved by a definition in a shared object. */ |
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LDPR_RESOLVED_DYN, |
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|
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/* This is the prevailing definition of the symbol, with no |
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references from regular objects. It is only referenced from IR |
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code, but the symbol is exported and may be referenced from |
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a dynamic object (not seen at link time). */ |
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LDPR_PREVAILING_DEF_IRONLY_EXP |
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}; |
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|
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/* The plugin library's "claim file" handler. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_claim_file_handler) ( |
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const struct ld_plugin_input_file *file, int *claimed); |
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|
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/* The plugin library's "all symbols read" handler. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_all_symbols_read_handler) (void); |
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|
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/* The plugin library's cleanup handler. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_cleanup_handler) (void); |
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|
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/* The linker's interface for registering the "claim file" handler. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_register_claim_file) (ld_plugin_claim_file_handler handler); |
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|
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/* The linker's interface for registering the "all symbols read" handler. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_register_all_symbols_read) ( |
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ld_plugin_all_symbols_read_handler handler); |
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|
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/* The linker's interface for registering the cleanup handler. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_register_cleanup) (ld_plugin_cleanup_handler handler); |
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|
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/* The linker's interface for adding symbols from a claimed input file. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_add_symbols) (void *handle, int nsyms, |
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const struct ld_plugin_symbol *syms); |
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|
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/* The linker's interface for getting the input file information with |
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an open (possibly re-opened) file descriptor. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_get_input_file) (const void *handle, |
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struct ld_plugin_input_file *file); |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_get_view) (const void *handle, const void **viewp); |
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|
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/* The linker's interface for releasing the input file. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_release_input_file) (const void *handle); |
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|
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/* The linker's interface for retrieving symbol resolution information. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_get_symbols) (const void *handle, int nsyms, |
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struct ld_plugin_symbol *syms); |
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|
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/* The linker's interface for adding a compiled input file. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_add_input_file) (const char *pathname); |
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|
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/* The linker's interface for adding a library that should be searched. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_add_input_library) (const char *libname); |
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|
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/* The linker's interface for adding a library path that should be searched. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_set_extra_library_path) (const char *path); |
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|
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/* The linker's interface for issuing a warning or error message. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_message) (int level, const char *format, ...); |
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|
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/* The linker's interface for retrieving the number of sections in an object. |
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The handle is obtained in the claim_file handler. This interface should |
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only be invoked in the claim_file handler. This function sets *COUNT to |
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the number of sections in the object. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_get_input_section_count) (const void* handle, unsigned int *count); |
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|
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/* The linker's interface for retrieving the section type of a specific |
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section in an object. This interface should only be invoked in the |
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claim_file handler. This function sets *TYPE to an ELF SHT_xxx value. */ |
| 362 |
|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_get_input_section_type) (const struct ld_plugin_section section, |
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unsigned int *type); |
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|
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/* The linker's interface for retrieving the name of a specific section in |
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an object. This interface should only be invoked in the claim_file handler. |
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This function sets *SECTION_NAME_PTR to a null-terminated buffer allocated |
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by malloc. The plugin must free *SECTION_NAME_PTR. */ |
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|
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typedef |
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enum ld_plugin_status |
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(*ld_plugin_get_input_section_name) (const struct ld_plugin_section section, |
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char **section_name_ptr); |
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|
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/* The linker's interface for retrieving the contents of a specific section |
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in an object. This interface should only be invoked in the claim_file |
| 380 |
handler. This function sets *SECTION_CONTENTS to point to a buffer that is |
| 381 |
valid until clam_file handler returns. It sets *LEN to the size of the |
| 382 |
buffer. */ |
| 383 |
|
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typedef |
| 385 |
enum ld_plugin_status |
| 386 |
(*ld_plugin_get_input_section_contents) (const struct ld_plugin_section section, |
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const unsigned char **section_contents, |
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size_t* len); |
| 389 |
|
| 390 |
/* The linker's interface for specifying the desired order of sections. |
| 391 |
The sections should be specifed using the array SECTION_LIST in the |
| 392 |
order in which they should appear in the final layout. NUM_SECTIONS |
| 393 |
specifies the number of entries in each array. This should be invoked |
| 394 |
in the all_symbols_read handler. */ |
| 395 |
|
| 396 |
typedef |
| 397 |
enum ld_plugin_status |
| 398 |
(*ld_plugin_update_section_order) (const struct ld_plugin_section *section_list, |
| 399 |
unsigned int num_sections); |
| 400 |
|
| 401 |
/* The linker's interface for specifying that reordering of sections is |
| 402 |
desired so that the linker can prepare for it. This should be invoked |
| 403 |
before update_section_order, preferably in the claim_file handler. */ |
| 404 |
|
| 405 |
typedef |
| 406 |
enum ld_plugin_status |
| 407 |
(*ld_plugin_allow_section_ordering) (void); |
| 408 |
|
| 409 |
/* The linker's interface for specifying that a subset of sections is |
| 410 |
to be mapped to a unique segment. If the plugin wants to call |
| 411 |
unique_segment_for_sections, it must call this function from a |
| 412 |
claim_file_handler or when it is first loaded. */ |
| 413 |
|
| 414 |
typedef |
| 415 |
enum ld_plugin_status |
| 416 |
(*ld_plugin_allow_unique_segment_for_sections) (void); |
| 417 |
|
| 418 |
/* The linker's interface for specifying that a specific set of sections |
| 419 |
must be mapped to a unique segment. ELF segments do not have names |
| 420 |
and the NAME is used as the name of the newly created output section |
| 421 |
that is then placed in the unique PT_LOAD segment. FLAGS is used to |
| 422 |
specify if any additional segment flags need to be set. For instance, |
| 423 |
a specific segment flag can be set to identify this segment. Unsetting |
| 424 |
segment flags that would be set by default is not possible. The |
| 425 |
parameter SEGMENT_ALIGNMENT when non-zero will override the default. */ |
| 426 |
|
| 427 |
typedef |
| 428 |
enum ld_plugin_status |
| 429 |
(*ld_plugin_unique_segment_for_sections) ( |
| 430 |
const char* segment_name, |
| 431 |
uint64_t segment_flags, |
| 432 |
uint64_t segment_alignment, |
| 433 |
const struct ld_plugin_section * section_list, |
| 434 |
unsigned int num_sections); |
| 435 |
|
| 436 |
/* The linker's interface for retrieving the section alignment requirement |
| 437 |
of a specific section in an object. This interface should only be invoked in the |
| 438 |
claim_file handler. This function sets *ADDRALIGN to the ELF sh_addralign |
| 439 |
value of the input section. */ |
| 440 |
|
| 441 |
typedef |
| 442 |
enum ld_plugin_status |
| 443 |
(*ld_plugin_get_input_section_alignment) (const struct ld_plugin_section section, |
| 444 |
unsigned int *addralign); |
| 445 |
|
| 446 |
/* The linker's interface for retrieving the section size of a specific section |
| 447 |
in an object. This interface should only be invoked in the claim_file handler. |
| 448 |
This function sets *SECSIZE to the ELF sh_size |
| 449 |
value of the input section. */ |
| 450 |
|
| 451 |
typedef |
| 452 |
enum ld_plugin_status |
| 453 |
(*ld_plugin_get_input_section_size) (const struct ld_plugin_section section, |
| 454 |
uint64_t *secsize); |
| 455 |
|
| 456 |
typedef |
| 457 |
enum ld_plugin_status |
| 458 |
(*ld_plugin_new_input_handler) (const struct ld_plugin_input_file *file); |
| 459 |
|
| 460 |
/* The linker's interface for registering the "new_input" handler. This handler |
| 461 |
will be notified when a new input file has been added after the |
| 462 |
all_symbols_read event, allowing the plugin to, for example, set a unique |
| 463 |
segment for sections in plugin-generated input files. */ |
| 464 |
|
| 465 |
typedef |
| 466 |
enum ld_plugin_status |
| 467 |
(*ld_plugin_register_new_input) (ld_plugin_new_input_handler handler); |
| 468 |
|
| 469 |
/* The linker's interface for getting the list of wrapped symbols using the |
| 470 |
--wrap option. This sets *NUM_SYMBOLS to number of wrapped symbols and |
| 471 |
*WRAP_SYMBOL_LIST to the list of wrapped symbols. */ |
| 472 |
|
| 473 |
typedef |
| 474 |
enum ld_plugin_status |
| 475 |
(*ld_plugin_get_wrap_symbols) (uint64_t *num_symbols, |
| 476 |
const char ***wrap_symbol_list); |
| 477 |
|
| 478 |
enum ld_plugin_level |
| 479 |
{ |
| 480 |
LDPL_INFO, |
| 481 |
LDPL_WARNING, |
| 482 |
LDPL_ERROR, |
| 483 |
LDPL_FATAL |
| 484 |
}; |
| 485 |
|
| 486 |
/* Values for the tv_tag field of the transfer vector. */ |
| 487 |
|
| 488 |
enum ld_plugin_tag |
| 489 |
{ |
| 490 |
LDPT_NULL = 0, |
| 491 |
LDPT_API_VERSION = 1, |
| 492 |
LDPT_GOLD_VERSION = 2, |
| 493 |
LDPT_LINKER_OUTPUT = 3, |
| 494 |
LDPT_OPTION = 4, |
| 495 |
LDPT_REGISTER_CLAIM_FILE_HOOK = 5, |
| 496 |
LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK = 6, |
| 497 |
LDPT_REGISTER_CLEANUP_HOOK = 7, |
| 498 |
LDPT_ADD_SYMBOLS = 8, |
| 499 |
LDPT_GET_SYMBOLS = 9, |
| 500 |
LDPT_ADD_INPUT_FILE = 10, |
| 501 |
LDPT_MESSAGE = 11, |
| 502 |
LDPT_GET_INPUT_FILE = 12, |
| 503 |
LDPT_RELEASE_INPUT_FILE = 13, |
| 504 |
LDPT_ADD_INPUT_LIBRARY = 14, |
| 505 |
LDPT_OUTPUT_NAME = 15, |
| 506 |
LDPT_SET_EXTRA_LIBRARY_PATH = 16, |
| 507 |
LDPT_GNU_LD_VERSION = 17, |
| 508 |
LDPT_GET_VIEW = 18, |
| 509 |
LDPT_GET_INPUT_SECTION_COUNT = 19, |
| 510 |
LDPT_GET_INPUT_SECTION_TYPE = 20, |
| 511 |
LDPT_GET_INPUT_SECTION_NAME = 21, |
| 512 |
LDPT_GET_INPUT_SECTION_CONTENTS = 22, |
| 513 |
LDPT_UPDATE_SECTION_ORDER = 23, |
| 514 |
LDPT_ALLOW_SECTION_ORDERING = 24, |
| 515 |
LDPT_GET_SYMBOLS_V2 = 25, |
| 516 |
LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS = 26, |
| 517 |
LDPT_UNIQUE_SEGMENT_FOR_SECTIONS = 27, |
| 518 |
LDPT_GET_SYMBOLS_V3 = 28, |
| 519 |
LDPT_GET_INPUT_SECTION_ALIGNMENT = 29, |
| 520 |
LDPT_GET_INPUT_SECTION_SIZE = 30, |
| 521 |
LDPT_REGISTER_NEW_INPUT_HOOK = 31, |
| 522 |
LDPT_GET_WRAP_SYMBOLS = 32, |
| 523 |
LDPT_ADD_SYMBOLS_V2 = 33 |
| 524 |
}; |
| 525 |
|
| 526 |
/* The plugin transfer vector. */ |
| 527 |
|
| 528 |
struct ld_plugin_tv |
| 529 |
{ |
| 530 |
enum ld_plugin_tag tv_tag; |
| 531 |
union |
| 532 |
{ |
| 533 |
int tv_val; |
| 534 |
const char *tv_string; |
| 535 |
ld_plugin_register_claim_file tv_register_claim_file; |
| 536 |
ld_plugin_register_all_symbols_read tv_register_all_symbols_read; |
| 537 |
ld_plugin_register_cleanup tv_register_cleanup; |
| 538 |
ld_plugin_add_symbols tv_add_symbols; |
| 539 |
ld_plugin_get_symbols tv_get_symbols; |
| 540 |
ld_plugin_add_input_file tv_add_input_file; |
| 541 |
ld_plugin_message tv_message; |
| 542 |
ld_plugin_get_input_file tv_get_input_file; |
| 543 |
ld_plugin_get_view tv_get_view; |
| 544 |
ld_plugin_release_input_file tv_release_input_file; |
| 545 |
ld_plugin_add_input_library tv_add_input_library; |
| 546 |
ld_plugin_set_extra_library_path tv_set_extra_library_path; |
| 547 |
ld_plugin_get_input_section_count tv_get_input_section_count; |
| 548 |
ld_plugin_get_input_section_type tv_get_input_section_type; |
| 549 |
ld_plugin_get_input_section_name tv_get_input_section_name; |
| 550 |
ld_plugin_get_input_section_contents tv_get_input_section_contents; |
| 551 |
ld_plugin_update_section_order tv_update_section_order; |
| 552 |
ld_plugin_allow_section_ordering tv_allow_section_ordering; |
| 553 |
ld_plugin_allow_unique_segment_for_sections tv_allow_unique_segment_for_sections; |
| 554 |
ld_plugin_unique_segment_for_sections tv_unique_segment_for_sections; |
| 555 |
ld_plugin_get_input_section_alignment tv_get_input_section_alignment; |
| 556 |
ld_plugin_get_input_section_size tv_get_input_section_size; |
| 557 |
ld_plugin_register_new_input tv_register_new_input; |
| 558 |
ld_plugin_get_wrap_symbols tv_get_wrap_symbols; |
| 559 |
} tv_u; |
| 560 |
}; |
| 561 |
|
| 562 |
/* The plugin library's "onload" entry point. */ |
| 563 |
|
| 564 |
typedef |
| 565 |
enum ld_plugin_status |
| 566 |
(*ld_plugin_onload) (struct ld_plugin_tv *tv); |
| 567 |
|
| 568 |
#ifdef __cplusplus |
| 569 |
} |
| 570 |
#endif |
| 571 |
|
| 572 |
#endif /* !defined(PLUGIN_API_H) */ |
