96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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* Copyright (C) 2014 Google, Inc.
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* Copyright (C) 2018 Eltan B.V.
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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; version 2 of the License.
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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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#ifndef TOOL_RMODULE_H
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#define TOOL_RMODULE_H
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#include "elfparsing.h"
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#include "common.h"
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struct arch_ops {
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int arch;
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/* Determine if relocation is a valid type for the architecture. */
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int (*valid_type)(Elf64_Rela *rel);
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/* Determine if relocation should be emitted. */
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int (*should_emit)(Elf64_Rela *rel);
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};
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/*
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* The fields in rmod_context are read-only to the user. These are
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* exposed for easy shareability.
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*/
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struct rmod_context {
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/* Ops to process relocations. */
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const struct arch_ops *ops;
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/* endian conversion ops */
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struct xdr *xdr;
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/* Parsed ELF structure. */
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struct parsed_elf pelf;
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/* Program segment. */
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Elf64_Phdr *phdr;
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/* Collection of relocation addresses fixup in the module. */
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Elf64_Xword nrelocs;
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Elf64_Addr *emitted_relocs;
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/* The following fields are addresses within the linked program. */
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Elf64_Addr parameters_begin;
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Elf64_Addr parameters_end;
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Elf64_Addr bss_begin;
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Elf64_Addr bss_end;
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};
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struct reloc_filter {
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/* Return < 0 on error. 0 to ignore relocation and 1 to include
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* relocation. */
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int (*filter)(struct reloc_filter *f, const Elf64_Rela *r);
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/* Pointer for filter provides */
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void *context;
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};
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/*
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* Parse an ELF file within the elfin buffer and fill in the elfout buffer
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* with a created rmodule in ELF format. Return 0 on success, < 0 on error.
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*/
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int rmodule_create(const struct buffer *elfin, struct buffer *elfout);
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/*
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* Initialize an rmodule context from an ELF buffer. Returns 0 on scucess, < 0
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* on error.
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*/
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int rmodule_init(struct rmod_context *ctx, const struct buffer *elfin);
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/*
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* Collect all the relocations that apply to the program in
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* nrelocs/emitted_relocs. One can optionally provide a reloc_filter object
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* to help in relocation filtering. The filter function will be called twice:
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* once for counting and once for emitting. The same response should be
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* provided for each call. Returns 0 on success, < 0 on error.
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*/
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int rmodule_collect_relocations(struct rmod_context *c, struct reloc_filter *f);
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/* Clean up the memory consumed by the rmodule context. */
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void rmodule_cleanup(struct rmod_context *ctx);
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/*
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* Create an ELF file from the passed in rmodule in the buffer. The buffer
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* contents will be replaced with an ELF file. Returns 1 if buff doesn't
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* contain an rmodule and < 0 on failure, 0 on success.
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*/
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int rmodule_stage_to_elf(Elf64_Ehdr *ehdr, struct buffer *buff);
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#endif /* TOOL_RMODULE_H */
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