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/*
* Copyright (C) 2014 Google, Inc.
*
* This program 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; version 2 of the License.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc.
*/
#ifndef TOOL_RMODULE_H
#define TOOL_RMODULE_H
#include "elfparsing.h"
#include "common.h"
struct arch_ops {
int arch;
/* Determine if relocation is a valid type for the architecture. */
int (*valid_type)(Elf64_Rela *rel);
/* Determine if relocation should be emitted. */
int (*should_emit)(Elf64_Rela *rel);
};
/*
* The fields in rmod_context are read-only to the user. These are
* exposed for easy shareability.
*/
struct rmod_context {
/* Ops to process relocations. */
const struct arch_ops *ops;
/* endian conversion ops */
struct xdr *xdr;
/* Parsed ELF sturcture. */
struct parsed_elf pelf;
/* Program segment. */
Elf64_Phdr *phdr;
/* Collection of relocation addresses fixup in the module. */
Elf64_Xword nrelocs;
Elf64_Addr *emitted_relocs;
/* The following fields are addresses within the linked program. */
Elf64_Addr parameters_begin;
Elf64_Addr parameters_end;
Elf64_Addr bss_begin;
Elf64_Addr bss_end;
};
struct reloc_filter {
/* Return < 0 on error. 0 to ignore relocation and 1 to include
* relocation. */
int (*filter)(struct reloc_filter *f, const Elf64_Rela *r);
/* Pointer for filter provides */
void *context;
};
/*
* Parse an ELF file within the elfin buffer and fill in the elfout buffer
* with a created rmodule in ELF format. Return 0 on success, < 0 on error.
*/
int rmodule_create(const struct buffer *elfin, struct buffer *elfout);
/*
* Initialize an rmodule context from an ELF buffer. Returns 0 on scucess, < 0
* on error.
*/
int rmodule_init(struct rmod_context *ctx, const struct buffer *elfin);
/*
* Collect all the relocations that apply to the program in
* nrelocs/emitted_relocs. One can optionally provide a reloc_filter object
* to help in relocation filtering. The filter function will be called twice:
* once for counting and once for emitting. The same response should be
* provided for each call. Returns 0 on success, < 0 on error.
*/
int rmodule_collect_relocations(struct rmod_context *c, struct reloc_filter *f);
/* Clean up the memory consumed by the rmdoule context. */
void rmodule_cleanup(struct rmod_context *ctx);
/*
* Create an ELF file from the passed in rmodule in the buffer. The buffer
* contents will be replaced with an ELF file. Returns 1 if buff doesn't
* contain an rmodule and < 0 on failure, 0 on success.
*/
int rmodule_stage_to_elf(Elf64_Ehdr *ehdr, struct buffer *buff);
#endif /* TOOL_RMODULE_H */
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