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https://github.com/brain-hackers/u-boot-brain
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3dcdd17b43
Add the required x86 glue code. This includes the initial start-up, relocation and jumping to efi_main(). We also need to avoid fiddling with interrupts. Signed-off-by: Ben Stoltz <stoltz@google.com> Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
73 lines
1.3 KiB
C
73 lines
1.3 KiB
C
/*
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* reloc_ia32.c - position independent x86 ELF shared object relocator
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* Copyright (C) 1999 Hewlett-Packard Co.
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* Contributed by David Mosberger <davidm@hpl.hp.com>.
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*
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* All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <common.h>
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#include <efi.h>
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#include <elf.h>
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#include <asm/elf.h>
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efi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image,
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struct efi_system_table *systab)
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{
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long relsz = 0, relent = 0;
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Elf32_Rel *rel = 0;
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unsigned long *addr;
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int i;
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for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
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switch (dyn[i].d_tag) {
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case DT_REL:
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rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr +
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ldbase);
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break;
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case DT_RELSZ:
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relsz = dyn[i].d_un.d_val;
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break;
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case DT_RELENT:
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relent = dyn[i].d_un.d_val;
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break;
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case DT_RELA:
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break;
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default:
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break;
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}
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}
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if (!rel && relent == 0)
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return EFI_SUCCESS;
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if (!rel || relent == 0)
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return EFI_LOAD_ERROR;
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while (relsz > 0) {
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/* apply the relocs */
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switch (ELF32_R_TYPE(rel->r_info)) {
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case R_386_NONE:
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break;
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case R_386_RELATIVE:
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addr = (unsigned long *)(ldbase + rel->r_offset);
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*addr += ldbase;
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break;
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default:
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break;
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}
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rel = (Elf32_Rel *)((char *)rel + relent);
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relsz -= relent;
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}
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return EFI_SUCCESS;
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}
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