260 lines
7.5 KiB
C
260 lines
7.5 KiB
C
/****************************************************************************
|
|
* libs/libc/machine/arm/armv7-a/arch_elf.c
|
|
*
|
|
* 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 <inttypes.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <arch/elf.h>
|
|
#include <nuttx/elf.h>
|
|
|
|
/****************************************************************************
|
|
* 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(FAR const Elf32_Ehdr *ehdr)
|
|
{
|
|
/* Make sure it's an ARM executable */
|
|
|
|
if (ehdr->e_machine != EM_ARM)
|
|
{
|
|
berr("ERROR: Not for ARM: e_machine=%04x\n", ehdr->e_machine);
|
|
return false;
|
|
}
|
|
|
|
/* Make sure that 32-bit objects are supported */
|
|
|
|
if (ehdr->e_ident[EI_CLASS] != ELFCLASS32)
|
|
{
|
|
berr("ERROR: Need 32-bit objects: e_ident[EI_CLASS]=%02x\n",
|
|
ehdr->e_ident[EI_CLASS]);
|
|
return false;
|
|
}
|
|
|
|
/* Verify endian-ness */
|
|
|
|
#ifdef CONFIG_ENDIAN_BIG
|
|
if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB)
|
|
#else
|
|
if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB)
|
|
#endif
|
|
{
|
|
berr("ERROR: Wrong endian-ness: e_ident[EI_DATA]=%02x\n",
|
|
ehdr->e_ident[EI_DATA]);
|
|
return false;
|
|
}
|
|
|
|
/* Make sure the entry point address is properly aligned */
|
|
|
|
if ((ehdr->e_entry & 3) != 0)
|
|
{
|
|
berr("ERROR: Entry point is not properly aligned: %08" PRIx32 "\n",
|
|
ehdr->e_entry);
|
|
return false;
|
|
}
|
|
|
|
/* TODO: Check ABI here. */
|
|
|
|
return true;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* 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(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
|
|
uintptr_t addr)
|
|
{
|
|
int32_t offset;
|
|
unsigned int relotype;
|
|
|
|
/* All relocations except R_ARM_V4BX depend upon having valid symbol
|
|
* information.
|
|
*/
|
|
|
|
relotype = ELF32_R_TYPE(rel->r_info);
|
|
if (sym == NULL && relotype != R_ARM_NONE && relotype != R_ARM_V4BX)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Handle the relocation by relocation type */
|
|
|
|
switch (relotype)
|
|
{
|
|
case R_ARM_NONE:
|
|
{
|
|
/* No relocation */
|
|
}
|
|
break;
|
|
|
|
case R_ARM_PC24:
|
|
case R_ARM_CALL:
|
|
case R_ARM_JUMP24:
|
|
{
|
|
binfo("Performing PC24 [%" PRId32 "] link "
|
|
"at addr %08lx [%08lx] to sym '%p' st_value=%08lx\n",
|
|
ELF32_R_TYPE(rel->r_info), (long)addr,
|
|
(long)(*(uint32_t *)addr),
|
|
sym, (long)sym->st_value);
|
|
|
|
offset = (*(uint32_t *)addr & 0x00ffffff) << 2;
|
|
if (offset & 0x02000000)
|
|
{
|
|
offset -= 0x04000000;
|
|
}
|
|
|
|
offset += sym->st_value - addr;
|
|
if (offset & 3 || offset < (int32_t) 0xfe000000 ||
|
|
offset >= (int32_t) 0x02000000)
|
|
{
|
|
berr("ERROR: PC24 [%" PRId32 "] relocation out of range, "
|
|
"offset=%08lx\n",
|
|
ELF32_R_TYPE(rel->r_info), offset);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
offset >>= 2;
|
|
|
|
*(uint32_t *)addr &= 0xff000000;
|
|
*(uint32_t *)addr |= offset & 0x00ffffff;
|
|
}
|
|
break;
|
|
|
|
case R_ARM_ABS32:
|
|
case R_ARM_TARGET1: /* New ABI: TARGET1 always treated as ABS32 */
|
|
{
|
|
binfo("Performing ABS32 link "
|
|
"at addr=%08lx [%08lx] to sym=%p st_value=%08lx\n",
|
|
(long)addr, (long)(*(uint32_t *)addr), sym,
|
|
(long)sym->st_value);
|
|
|
|
*(uint32_t *)addr += sym->st_value;
|
|
}
|
|
break;
|
|
|
|
case R_ARM_V4BX:
|
|
{
|
|
binfo("Performing V4BX link at addr=%08lx [%08lx]\n",
|
|
(long)addr, (long)(*(uint32_t *)addr));
|
|
|
|
/* Preserve only Rm and the condition code */
|
|
|
|
*(uint32_t *)addr &= 0xf000000f;
|
|
|
|
/* Change instruction to 'mov pc, Rm' */
|
|
|
|
*(uint32_t *)addr |= 0x01a0f000;
|
|
}
|
|
break;
|
|
|
|
case R_ARM_PREL31:
|
|
{
|
|
binfo("Performing PREL31 link "
|
|
"at addr=%08lx [%08lx] to sym=%p st_value=%08lx\n",
|
|
(long)addr, (long)(*(uint32_t *)addr), sym,
|
|
(long)sym->st_value);
|
|
|
|
offset = *(uint32_t *)addr + sym->st_value - addr;
|
|
*(uint32_t *)addr = offset & 0x7fffffff;
|
|
}
|
|
break;
|
|
|
|
case R_ARM_MOVW_ABS_NC:
|
|
case R_ARM_MOVT_ABS:
|
|
{
|
|
binfo("Performing MOVx_ABS [%" PRId32 "] link "
|
|
"at addr=%08lx [%08lx] to sym=%p st_value=%08lx\n",
|
|
ELF32_R_TYPE(rel->r_info), (long)addr,
|
|
(long)(*(uint32_t *)addr),
|
|
sym, (long)sym->st_value);
|
|
|
|
offset = *(uint32_t *)addr;
|
|
offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
|
|
|
|
offset += sym->st_value;
|
|
if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
|
|
{
|
|
offset >>= 16;
|
|
}
|
|
|
|
*(uint32_t *)addr &= 0xfff0f000;
|
|
*(uint32_t *)addr |= ((offset & 0xf000) << 4) | (offset & 0x0fff);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
berr("ERROR: Unsupported relocation: %" PRId32 "\n",
|
|
ELF32_R_TYPE(rel->r_info));
|
|
return -EINVAL;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
int up_relocateadd(FAR const Elf32_Rela *rel, FAR const Elf32_Sym *sym,
|
|
uintptr_t addr)
|
|
{
|
|
berr("ERROR: RELA relocation not supported\n");
|
|
return -ENOSYS;
|
|
}
|