* libs/libc/machine/x86/arch_elf.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdlib.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/elf.h>
* Pre-processor Definitions
****************************************************************************/
#define R_386_32 1
#define R_386_PC32 2
#define ELF_BITS 32
#define ELF_ARCH EM_386
* Private Data
****************************************************************************/
* Private Functions
****************************************************************************/
* Public Functions
****************************************************************************/
* Name: up_checkarch
*
* Description:
* Given the ELF header in 'hdr', verify that the ELF file is appropriate
* for the current, configured architecture. Every architecture that uses
* the ELF loader must provide this function.
*
* Input Parameters:
* hdr - The ELF header read from the ELF file.
*
* Returned Value:
* True if the architecture supports this ELF file.
*
****************************************************************************/
bool up_checkarch(const Elf32_Ehdr *hdr)
{
return hdr->e_machine == EM_386 || hdr->e_machine == EM_486;
}
* Name: up_relocate and up_relocateadd
*
* Description:
* Perform an architecture-specific ELF relocation. Every architecture
* that uses the ELF loader must provide this function.
*
* Input Parameters:
* rel - The relocation type
* sym - The ELF symbol structure containing the fully resolved value.
* There are a few relocation types for a few architectures that do
* not require symbol information. For those, this value will be
* NULL. Implementations of these functions must be able to handle
* that case.
* addr - The address that requires the relocation.
*
* Returned Value:
* Zero (OK) if the relocation was successful. Otherwise, a negated errno
* value indicating the cause of the relocation failure.
*
****************************************************************************/
int up_relocate(const Elf32_Rel *rel, const Elf32_Sym *sym, uintptr_t addr,
void *arch_data)
{
uint32_t *ptr = (uint32_t *)addr;
if (sym == NULL)
{
return -EINVAL;
}
switch (ELF32_R_TYPE(rel->r_info))
{
case R_386_32:
*ptr += sym->st_value;
break;
case R_386_PC32:
*ptr += sym->st_value - (uint32_t)ptr;
break;
default:
return -EINVAL;
}
return OK;
}
int up_relocateadd(const Elf32_Rela *rel, const Elf32_Sym *sym,
uintptr_t addr, void *arch_data)
{
bwarn("WARNING: Not supported\n");
return -ENOSYS;
}