/*
 * Copyright 2004-2018 Haiku, Inc. All Rights Reserved.
 * Distributed under the terms of the MIT License.
 * Copyright 2002, Travis Geiselbrecht. All rights reserved.
 * Distributed under the terms of the NewOS License.
 */


#ifdef _BOOT_MODE
#       include <boot/arch.h>
#endif

#include <KernelExport.h>

#include <elf_priv.h>
#include <arch/elf.h>


//#define TRACE_ARCH_ELF
#ifdef TRACE_ARCH_ELF
#       define TRACE(x) dprintf x
#else
#       define TRACE(x) ;
#endif


#ifndef _BOOT_MODE
static bool
is_in_image(struct elf_image_info *image, addr_t address)
{
        return (address >= image->text_region.start
                        && address < image->text_region.start + image->text_region.size)
                || (address >= image->data_region.start
                        && address < image->data_region.start + image->data_region.size);
}
#endif  // !_BOOT_MODE


#ifdef _BOOT_MODE
status_t
boot_arch_elf_relocate_rel(preloaded_elf64_image* image, Elf64_Rel* rel,
        int relLength)
#else
int
arch_elf_relocate_rel(struct elf_image_info *image,
        struct elf_image_info *resolveImage, Elf64_Rel *rel, int relLength)
#endif
{
        dprintf("arch_elf_relocate_rel: not supported on arm64\n");
        return B_ERROR;
}


#ifdef _BOOT_MODE
status_t
boot_arch_elf_relocate_rela(preloaded_elf64_image* image, Elf64_Rela* rel,
        int relLength)
#else
int
arch_elf_relocate_rela(struct elf_image_info *image,
        struct elf_image_info *resolveImage, Elf64_Rela *rel, int relLength)
#endif
{
        for (int i = 0; i < relLength / (int)sizeof(Elf64_Rela); i++) {
                int type = ELF64_R_TYPE(rel[i].r_info);
                int symIndex = ELF64_R_SYM(rel[i].r_info);
                Elf64_Addr symAddr = 0;

                // Resolve the symbol, if any.
                if (symIndex != 0) {
                        Elf64_Sym* symbol = SYMBOL(image, symIndex);

                        status_t status;
#ifdef _BOOT_MODE
                        status = boot_elf_resolve_symbol(image, symbol, &symAddr);
#else
                        status = elf_resolve_symbol(image, symbol, resolveImage, &symAddr);
#endif
                        if (status < B_OK)
                                return status;
                }

                // Address of the relocation.
                Elf64_Addr relocAddr = image->text_region.delta + rel[i].r_offset;

                // Calculate the relocation value.
                Elf64_Addr relocValue;
                switch (type) {
                        case R_AARCH64_NONE:
                                continue;
                        case R_AARCH64_ABS64:
                                relocValue = symAddr + rel[i].r_addend;
                                break;
                        case R_AARCH64_ABS32:
                        case R_AARCH64_ABS16:
                        case R_AARCH64_PREL64:
                        case R_AARCH64_PREL32:
                        case R_AARCH64_PREL16:
                        case R_AARCH64_TSTBR14:
                        case R_AARCH64_CONDBR19:
                        case R_AARCH64_JUMP26:
                        case R_AARCH64_CALL26:
                        case R_AARCH64_COPY:
                                dprintf("arch_elf_relocate_rela: unhandled relocation type %d\n",
                                        type);
                                return B_BAD_DATA;
                        case R_AARCH64_GLOB_DAT:
                        case R_AARCH64_JUMP_SLOT:
                                relocValue = symAddr + rel[i].r_addend;
                                break;
                        case R_AARCH64_RELATIVE:
                                relocValue = image->text_region.delta + rel[i].r_addend;
                                break;
                        case R_AARCH64_TLS_DTPREL64:
                        case R_AARCH64_TLS_DTPMOD64:
                        case R_AARCH64_TLS_TPREL64:
                        case R_AARCH64_TLSDESC:
                        case R_AARCH64_IRELATIVE:
                        default:
                                dprintf("arch_elf_relocate_rela: unhandled relocation type %d\n",
                                        type);
                                return B_BAD_DATA;
                }

#ifdef _BOOT_MODE
                boot_elf64_set_relocation(relocAddr, relocValue);
#else
                if (!is_in_image(image, relocAddr)) {
                        dprintf("arch_elf_relocate_rela: invalid offset %#lx\n",
                                rel[i].r_offset);
                        return B_BAD_ADDRESS;
                }
                *(Elf64_Addr *)relocAddr = relocValue;
#endif
        }

        return B_OK;
}