llext_internal.h

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/*
 * Copyright (c) 2024 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_LLEXT_INTERNAL_H
#define ZEPHYR_LLEXT_INTERNAL_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <zephyr/llext/llext.h>


 
 
struct llext_elf_sect_map {
        enum llext_mem mem_idx;
        size_t offset;
};
 
const void *llext_loaded_sect_ptr(struct llext_loader *ldr, struct llext *ext, unsigned int sh_ndx);
 
 
static inline const char *llext_string(const struct llext_loader *ldr, const struct llext *ext,
        enum llext_mem mem_idx, unsigned int idx)
{
        if (idx >= ext->mem_size[mem_idx]) {
                return NULL;
        }
 
        return (const char *)ext->mem[mem_idx] + idx;
}
 
static inline uintptr_t llext_get_reloc_instruction_location(struct llext_loader *ldr,
                                                             struct llext *ext,
                                                             int shndx,
                                                             const elf_rela_t *rela)
{
        return (uintptr_t) llext_loaded_sect_ptr(ldr, ext, shndx) + rela->r_offset;
}
 
static inline const char *llext_section_name(const struct llext_loader *ldr,
                                             const struct llext *ext,
                                             const elf_shdr_t *shdr)
{
        return llext_string(ldr, ext, LLEXT_MEM_SHSTRTAB, shdr->sh_name);
}
 
static inline const char *llext_symbol_name(const struct llext_loader *ldr,
                                            const struct llext *ext,
                                            const elf_sym_t *sym)
{
        if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) {
                if (sym->st_shndx >= ext->sect_cnt) {
                        return NULL;
                }
                return llext_section_name(ldr, ext, ext->sect_hdrs + sym->st_shndx);
        } else {
                return llext_string(ldr, ext, LLEXT_MEM_STRTAB, sym->st_name);
        }
}
 
/*
 * Determine address of a symbol.
 */
int llext_lookup_symbol(struct llext_loader *ldr, struct llext *ext, uintptr_t *link_addr,
                        const elf_rela_t *rel, const elf_sym_t *sym, const char *name,
                        const elf_shdr_t *shdr);
 
/*
 * Read the symbol entry corresponding to a relocation from the binary.
 */
int llext_read_symbol(struct llext_loader *ldr, struct llext *ext, const elf_rela_t *rel,
                      elf_sym_t *sym);


int arch_elf_veneer_init(struct llext_loader *ldr, struct llext *ext);

int arch_elf_relocate_local(struct llext_loader *loader, struct llext *ext, const elf_rela_t *rel,
                            const elf_sym_t *sym, uint8_t *rel_addr,
                            const struct llext_load_param *ldr_parm);

int arch_elf_relocate_global(struct llext_loader *loader, struct llext *ext, const elf_rela_t *rel,
                             const elf_sym_t *sym, uint8_t *rel_addr, const void *link_addr);
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_LLEXT_INTERNAL_H */