mirror of
https://github.com/apache/nuttx.git
synced 2026-06-07 01:05:54 +08:00
ELF: Move ARMv7-A and ARMv7-R versions of ELF relocation logic to libc/machine
This commit is contained in:
Gregory Nutt
@@ -51,6 +51,10 @@ config LIBC_ARCH_BZERO
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bool
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default n
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config LIBC_ARCH_ELF
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bool
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default n
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config LIBM_ARCH_CEIL
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bool
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default n
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@@ -41,3 +41,12 @@ DEPPATH += --dep-path machine/arm/armv7-a/gnu
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VPATH += :machine/arm/armv7-a/gnu
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endif
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ifeq ($(CONFIG_LIBC_ARCH_ELF),y)
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CSRCS += arch_elf.c
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DEPPATH += --dep-path machine/arm/armv7-a
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VPATH += :machine/arm/armv7-a
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endif
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@@ -0,0 +1,261 @@
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/****************************************************************************
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* libc/machine/arm/armv-7a/arm_elf.c
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*
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* Copyright (C) 2013-2014, 2017 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
|
||||
* 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
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* 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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* 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(FAR const Elf32_Ehdr *ehdr)
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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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berr("ERROR: 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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berr("ERROR: 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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berr("ERROR: 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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berr("ERROR: Entry point is not properly aligned: %08x\n", ehdr->e_entry);
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return -ENOEXEC;
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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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* Name: up_relocate and up_relocateadd
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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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* 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(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
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uintptr_t addr)
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{
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int32_t offset;
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unsigned int relotype;
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/* All relocations except R_ARM_V4BX depend upon having valid symbol
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* information.
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*/
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relotype = ELF32_R_TYPE(rel->r_info);
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if (sym == NULL && relotype != R_ARM_NONE && relotype != R_ARM_V4BX)
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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 (relotype)
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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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binfo("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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berr("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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binfo("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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binfo("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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binfo("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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binfo("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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berr("ERROR: 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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int up_relocateadd(FAR const Elf32_Rela *rel, FAR const Elf32_Sym *sym,
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uintptr_t addr)
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{
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berr("ERROR: RELA relocation not supported\n");
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return -ENOSYS;
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}
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@@ -41,3 +41,12 @@ DEPPATH += --dep-path machine/arm/armv7-r/gnu
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VPATH += :machine/arm/armv7-r/gnu
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endif
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ifeq ($(CONFIG_LIBC_ARCH_ELF),y)
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CSRCS += arch_elf.c
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DEPPATH += --dep-path machine/arm/armv7-r
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VPATH += :machine/arm/armv7-r
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endif
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@@ -0,0 +1,273 @@
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/****************************************************************************
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* libc/machine/arm/armv7-r/arm_elf.c
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*
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* Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
|
||||
#include <stdlib.h>
|
||||
#include <elf32.h>
|
||||
#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>
|
||||
#include <nuttx/binfmt/elf.h>
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* 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(FAR const Elf32_Ehdr *ehdr)
|
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{
|
||||
/* 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 -ENOEXEC;
|
||||
}
|
||||
|
||||
/* 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 -ENOEXEC;
|
||||
}
|
||||
|
||||
/* 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 -ENOEXEC;
|
||||
}
|
||||
|
||||
/* Make sure the entry point address is properly aligned */
|
||||
|
||||
if ((ehdr->e_entry & 3) != 0)
|
||||
{
|
||||
berr("ERROR: Entry point is not properly aligned: %08x\n", ehdr->e_entry);
|
||||
return -ENOEXEC;
|
||||
}
|
||||
|
||||
/* TODO: Check ABI here. */
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* 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)
|
||||
{
|
||||
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 [%d] link at addr %08lx [%08lx] to sym '%s' 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: ERROR: PC24 [%d] 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 [%d] 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 = (offset ^ 0x8000) - 0x8000;
|
||||
|
||||
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: %d\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;
|
||||
}
|
||||
Reference in New Issue
Block a user