2013-07-19 19:43:04 +02:00
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/****************************************************************************
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* arch/arm/src/armv-7a/arm_elf.c
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*
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* Copyright (C) 2013 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 <arch/elf.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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/****************************************************************************
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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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2014-08-25 14:47:14 +02:00
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* Name: up_checkarch
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2013-07-19 19:43:04 +02:00
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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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2014-08-25 14:47:14 +02:00
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bool up_checkarch(FAR const Elf32_Ehdr *ehdr)
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2013-07-19 19:43:04 +02:00
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{
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/* Make sure it's an ARM executable */
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if (ehdr->e_machine != EM_ARM)
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{
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bdbg("Not for ARM: e_machine=%04x\n", ehdr->e_machine);
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return -ENOEXEC;
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}
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/* Make sure that 32-bit objects are supported */
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if (ehdr->e_ident[EI_CLASS] != ELFCLASS32)
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{
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bdbg("Need 32-bit objects: e_ident[EI_CLASS]=%02x\n", ehdr->e_ident[EI_CLASS]);
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return -ENOEXEC;
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}
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/* Verify endian-ness */
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#ifdef CONFIG_ENDIAN_BIG
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if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB)
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#else
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if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB)
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#endif
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{
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bdbg("Wrong endian-ness: e_ident[EI_DATA]=%02x\n", ehdr->e_ident[EI_DATA]);
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return -ENOEXEC;
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}
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/* Make sure the entry point address is properly aligned */
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if ((ehdr->e_entry & 3) != 0)
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{
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bdbg("Entry point is not properly aligned: %08x\n", ehdr->e_entry);
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2014-04-16 17:43:34 +02:00
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return -ENOEXEC;
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2013-07-19 19:43:04 +02:00
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}
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/* TODO: Check ABI here. */
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return OK;
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}
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/****************************************************************************
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2014-08-25 14:47:14 +02:00
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* Name: up_relocate and up_relocateadd
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2013-07-19 19:43:04 +02:00
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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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* 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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2014-08-25 14:47:14 +02:00
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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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2013-07-19 19:43:04 +02:00
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{
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int32_t offset;
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switch (ELF32_R_TYPE(rel->r_info))
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{
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case R_ARM_NONE:
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{
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/* No relocation */
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}
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break;
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case R_ARM_PC24:
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case R_ARM_CALL:
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case R_ARM_JUMP24:
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{
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bvdbg("Performing PC24 [%d] link at addr %08lx [%08lx] to sym '%s' st_value=%08lx\n",
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ELF32_R_TYPE(rel->r_info), (long)addr, (long)(*(uint32_t*)addr),
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sym, (long)sym->st_value);
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offset = (*(uint32_t*)addr & 0x00ffffff) << 2;
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if (offset & 0x02000000)
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{
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offset -= 0x04000000;
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}
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offset += sym->st_value - addr;
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if (offset & 3 || offset <= (int32_t) 0xfe000000 || offset >= (int32_t) 0x02000000)
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{
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bdbg(" ERROR: PC24 [%d] relocation out of range, offset=%08lx\n",
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ELF32_R_TYPE(rel->r_info), offset);
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return -EINVAL;
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}
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offset >>= 2;
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*(uint32_t*)addr &= 0xff000000;
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*(uint32_t*)addr |= offset & 0x00ffffff;
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}
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break;
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case R_ARM_ABS32:
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case R_ARM_TARGET1: /* New ABI: TARGET1 always treated as ABS32 */
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{
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bvdbg("Performing ABS32 link at addr=%08lx [%08lx] to sym=%p st_value=%08lx\n",
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(long)addr, (long)(*(uint32_t*)addr), sym, (long)sym->st_value);
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*(uint32_t*)addr += sym->st_value;
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}
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break;
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case R_ARM_V4BX:
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{
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bvdbg("Performing V4BX link at addr=%08lx [%08lx]\n",
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(long)addr, (long)(*(uint32_t*)addr));
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/* Preserve only Rm and the condition code */
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*(uint32_t*)addr &= 0xf000000f;
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/* Change instruction to 'mov pc, Rm' */
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*(uint32_t*)addr |= 0x01a0f000;
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}
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break;
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case R_ARM_PREL31:
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{
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bvdbg("Performing PREL31 link at addr=%08lx [%08lx] to sym=%p st_value=%08lx\n",
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(long)addr, (long)(*(uint32_t*)addr), sym, (long)sym->st_value);
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offset = *(uint32_t*)addr + sym->st_value - addr;
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*(uint32_t*)addr = offset & 0x7fffffff;
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}
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break;
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case R_ARM_MOVW_ABS_NC:
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case R_ARM_MOVT_ABS:
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{
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bvdbg("Performing MOVx_ABS [%d] link at addr=%08lx [%08lx] to sym=%p st_value=%08lx\n",
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ELF32_R_TYPE(rel->r_info), (long)addr, (long)(*(uint32_t*)addr),
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sym, (long)sym->st_value);
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offset = *(uint32_t*)addr;
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offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
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offset = (offset ^ 0x8000) - 0x8000;
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offset += sym->st_value;
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if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
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{
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offset >>= 16;
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}
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*(uint32_t*)addr &= 0xfff0f000;
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*(uint32_t*)addr |= ((offset & 0xf000) << 4) | (offset & 0x0fff);
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}
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break;
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default:
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bdbg("Unsupported relocation: %d\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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2014-08-25 14:47:14 +02:00
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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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2013-07-19 19:43:04 +02:00
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{
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bdbg("RELA relocation not supported\n");
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return -ENOSYS;
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}
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