127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/****************************************************************************
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* libs/libc/machine/sim/arch_elf.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <errno.h>
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#include <debug.h>
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#include <nuttx/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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* 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(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 an 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(const Elf32_Rel *rel, const Elf32_Sym *sym, uintptr_t addr)
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{
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uint32_t *ptr = (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)((uintptr_t)ptr);
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break;
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default:
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berr("ERROR: Unsupported type %u\n", ELF32_R_TYPE(rel->r_info));
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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(const Elf32_Rela *rel, const Elf32_Sym *sym,
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uintptr_t addr)
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{
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berr("ERROR: Not supported\n");
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return -ENOSYS;
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}
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