152 lines
5.2 KiB
C
152 lines
5.2 KiB
C
/****************************************************************************
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* machine/x86/src/up_elf.c
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*
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* Copyright (C) 2012, 2014, 2016-2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <elf32.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/binfmt/elf.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define R_386_32 1
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#define R_386_PC32 2
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#define ELF_BITS 32
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#define ELF_ARCH EM_386
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_checkarch
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*
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* Description:
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* Given the ELF header in 'hdr', verify that the ELF file is appropriate
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* for the current, configured architecture. Every architecture that uses
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* the ELF loader must provide this function.
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*
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* Input Parameters:
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* hdr - The ELF header read from the ELF file.
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*
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* Returned Value:
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* True if the architecture supports this ELF file.
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*
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****************************************************************************/
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bool up_checkarch(FAR const Elf32_Ehdr *hdr)
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{
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return hdr->e_machine == EM_386 || hdr->e_machine == EM_486;
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}
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/****************************************************************************
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* Name: up_relocate and up_relocateadd
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*
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* Description:
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* Perform on architecture-specific ELF relocation. Every architecture
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* that uses the ELF loader must provide this function.
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*
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* Input Parameters:
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* rel - The relocation type
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* sym - The ELF symbol structure containing the fully resolved value.
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* There are a few relocation types for a few architectures that do
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* not require symbol information. For those, this value will be
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* NULL. Implementations of these functions must be able to handle
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* that case.
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* addr - The address that requires the relocation.
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*
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* Returned Value:
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* Zero (OK) if the relocation was successful. Otherwise, a negated errno
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* value indicating the cause of the relocation failure.
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*
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****************************************************************************/
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int up_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
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uintptr_t addr)
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{
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FAR uint32_t *ptr = (FAR uint32_t *)addr;
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/* All relocations depend upon having valid symbol information. */
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if (sym == NULL)
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{
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return -EINVAL;
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}
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/* Handle the relocation by relocation type */
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switch (ELF32_R_TYPE(rel->r_info))
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{
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case R_386_32:
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*ptr += sym->st_value;
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break;
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case R_386_PC32:
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*ptr += sym->st_value - (uint32_t)ptr;
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break;
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default:
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return -EINVAL;
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}
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return OK;
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}
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int up_relocateadd(FAR const Elf32_Rela *rel, FAR const Elf32_Sym *sym,
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uintptr_t addr)
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{
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bwarn("WARNING: Not supported\n");
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return -ENOSYS;
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}
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