46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/*
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* Copyright (c) 2023 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/llext/elf.h>
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#include <zephyr/llext/llext.h>
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#include <zephyr/llext/loader.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_DECLARE(llext);
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#define R_XTENSA_NONE 0
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#define R_XTENSA_32 1
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#define R_XTENSA_RTLD 2
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#define R_XTENSA_GLOB_DAT 3
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#define R_XTENSA_JMP_SLOT 4
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#define R_XTENSA_RELATIVE 5
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#define R_XTENSA_PLT 6
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/**
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* @brief Architecture specific function for relocating shared elf
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*
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* Elf files contain a series of relocations described in multiple sections.
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* These relocation instructions are architecture specific and each architecture
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* supporting modules must implement this.
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*/
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void arch_elf_relocate_local(struct llext_loader *ldr, struct llext *ext,
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elf_rela_t *rel, size_t got_offset)
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{
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uint8_t *text = ext->mem[LLEXT_MEM_TEXT];
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int type = ELF32_R_TYPE(rel->r_info);
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if (type == R_XTENSA_RELATIVE) {
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elf_word ptr_offset = *(elf_word *)(text + got_offset);
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LOG_DBG("relocation type %u offset %#x value %#x",
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type, got_offset, ptr_offset);
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/* Relocate a local symbol: Xtensa specific */
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*(elf_word *)(text + got_offset) = (elf_word)(text + ptr_offset -
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ldr->sects[LLEXT_MEM_TEXT].sh_addr);
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}
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}
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