rt-thread-official/components/libc/posix/libdl/arch/x86.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author      Notes
 * 2018/09/15     parai     first version
 */

#include "../dlmodule.h"
#include "../dlelf.h"

#ifdef __i386__

#define DBG_TAG           "kernel.module"
#ifdef RT_DEBUG_MODULE
#define DBG_LVL           DBG_LOG
#else
#define DBG_LVL           DBG_WARNING
#endif /* defined (RT_DEBUG_MODULE) */
#include <rtdbg.h>

#define R_X86_64_GLOB_DAT   6   /* Create GOT entry */
#define R_X86_64_JUMP_SLOT  7   /* Create PLT entry */
#define R_X86_64_RELATIVE   8   /* Adjust by program base */
int dlmodule_relocate(struct rt_dlmodule *module, Elf32_Rel *rel, Elf32_Addr sym_val)
{
    Elf32_Addr *where, tmp;
    Elf32_Sword addend, offset;
    rt_uint32_t upper, lower, sign, j1, j2;

    where = (Elf32_Addr *)((rt_uint8_t *)module->mem_space
                           + rel->r_offset
                           - module->vstart_addr);

    switch (ELF32_R_TYPE(rel->r_info))
    {
        case R_X86_64_GLOB_DAT:
        case R_X86_64_JUMP_SLOT:
            *where = (Elf32_Addr)sym_val;

            LOG_D("R_X86_64_JUMP_SLOT: 0x%x -> 0x%x 0x%x",
                  (uint32_t)where, *where, sym_val);
            break;
        case R_X86_64_RELATIVE:
            *where = (Elf32_Addr)sym_val + *where;
            LOG_D("R_X86_64_RELATIVE: 0x%x -> 0x%x 0x%x",
                  (uint32_t)where, *where, sym_val);
            break;
        default:
            LOG_D("X86ELF: invalid relocate TYPE %d", ELF32_R_TYPE(rel->r_info));
            return -1;
    }

    return 0;
}
#endif