2020-03-05 03:26:21 +01:00
|
|
|
/****************************************************************************
|
2020-03-06 03:28:03 +01:00
|
|
|
* libs/libc/machine/xtensa/arch_elf.c
|
2020-03-05 03:26:21 +01:00
|
|
|
*
|
2020-03-06 03:33:16 +01:00
|
|
|
* 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
|
2020-03-05 03:26:21 +01:00
|
|
|
*
|
2020-03-06 03:33:16 +01:00
|
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
2020-03-05 03:26:21 +01:00
|
|
|
*
|
2020-03-06 03:33:16 +01:00
|
|
|
* 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.
|
2020-03-05 03:26:21 +01:00
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Included Files
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
|
2020-03-05 11:11:32 +01:00
|
|
|
#include <assert.h>
|
2020-03-05 03:26:21 +01:00
|
|
|
#include <stdlib.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <debug.h>
|
|
|
|
|
|
|
|
#include <arch/elf.h>
|
|
|
|
#include <nuttx/elf.h>
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Pre-processor Definitions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Private Data
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Private Functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
2020-03-05 11:11:32 +01:00
|
|
|
static bool is_l32r(FAR const unsigned char *p)
|
|
|
|
{
|
|
|
|
return (p[0] & 0xf) == 1;
|
|
|
|
}
|
|
|
|
|
2020-03-05 03:26:21 +01:00
|
|
|
/****************************************************************************
|
|
|
|
* 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 Xtensa executable */
|
|
|
|
|
|
|
|
if (ehdr->e_machine != EM_XTENSA)
|
|
|
|
{
|
|
|
|
berr("ERROR: Not for Xtensa: e_machine=%04x\n", ehdr->e_machine);
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Make sure that 32-bit objects are supported */
|
|
|
|
|
|
|
|
if (ehdr->e_ident[EI_CLASS] != ELFCLASS32)
|
|
|
|
{
|
2020-03-10 07:06:34 +01:00
|
|
|
berr("ERROR: Need 32-bit objects: e_ident[EI_CLASS]=%02x\n",
|
|
|
|
ehdr->e_ident[EI_CLASS]);
|
2020-03-05 03:26:21 +01:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Verify endian-ness */
|
|
|
|
|
|
|
|
#ifdef CONFIG_ENDIAN_BIG
|
2020-03-05 11:11:32 +01:00
|
|
|
#error not implemented
|
2020-03-05 03:26:21 +01:00
|
|
|
if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB)
|
|
|
|
#else
|
|
|
|
if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB)
|
|
|
|
#endif
|
|
|
|
{
|
2020-03-10 07:06:34 +01:00
|
|
|
berr("ERROR: Wrong endian-ness: e_ident[EI_DATA]=%02x\n",
|
|
|
|
ehdr->e_ident[EI_DATA]);
|
2020-03-05 03:26:21 +01:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: up_relocate and up_relocateadd
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Perform on 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)
|
|
|
|
{
|
|
|
|
unsigned int relotype;
|
|
|
|
|
|
|
|
/* All relocations except NONE depend upon having valid symbol
|
|
|
|
* information.
|
|
|
|
*/
|
|
|
|
|
|
|
|
relotype = ELF32_R_TYPE(rel->r_info);
|
|
|
|
if (sym == NULL && relotype != R_XTENSA_NONE)
|
|
|
|
{
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Handle the relocation by relocation type */
|
|
|
|
|
|
|
|
switch (relotype)
|
|
|
|
{
|
|
|
|
case R_XTENSA_NONE:
|
|
|
|
{
|
|
|
|
/* No relocation */
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
2020-03-05 11:11:32 +01:00
|
|
|
berr("ERROR: Unsupported relocation: %u\n", relotype);
|
2020-03-05 03:26:21 +01:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
int up_relocateadd(FAR const Elf32_Rela *rel, FAR const Elf32_Sym *sym,
|
|
|
|
uintptr_t addr)
|
|
|
|
{
|
2020-03-05 11:11:32 +01:00
|
|
|
unsigned int relotype;
|
|
|
|
unsigned char *p;
|
|
|
|
uint32_t value;
|
|
|
|
|
|
|
|
relotype = ELF32_R_TYPE(rel->r_info);
|
|
|
|
value = sym->st_value + rel->r_addend;
|
|
|
|
|
|
|
|
/* Handle the relocation by relocation type */
|
|
|
|
|
|
|
|
switch (relotype)
|
|
|
|
{
|
|
|
|
case R_XTENSA_32:
|
|
|
|
(*(FAR uint32_t *)addr) += value;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case R_XTENSA_ASM_EXPAND:
|
|
|
|
bwarn("WARNING: Ignoring RELA relocation R_XTENSA_ASM_EXPAND %u\n",
|
|
|
|
relotype);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case R_XTENSA_SLOT0_OP:
|
|
|
|
p = (FAR unsigned char *)addr;
|
|
|
|
if (is_l32r(p))
|
|
|
|
{
|
|
|
|
/* Xtensa ISA:
|
|
|
|
* L32R forms a virtual address by adding the 16-bit one-extended
|
|
|
|
* constant value encoded in the instruction word shifted left by
|
|
|
|
* two to the address of the L32R plus three with the two least
|
|
|
|
* significant bits cleared.
|
|
|
|
*/
|
|
|
|
|
|
|
|
uintptr_t base = (addr + 3) & ~3;
|
|
|
|
uint16_t imm = (value - base) >> 2;
|
|
|
|
if (base + (0xfffc0000 | ((uint32_t)imm << 2)) != value)
|
|
|
|
{
|
|
|
|
berr("ERROR: Out of range rellocation at %p\n", p);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
p[1] = imm & 0xff;
|
|
|
|
p[2] = (imm >> 8) & 0xff;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
bwarn("WARNING: Ignoring RELA relocation R_XTENSA_SLOT0_OP %u\n",
|
|
|
|
relotype);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
berr("ERROR: RELA relocation %u not supported\n", relotype);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return OK;
|
2020-03-05 03:26:21 +01:00
|
|
|
}
|