5b1c03fd13
The function was defined as taking 4 parameters and returning EFI_STATUS, but all existing callers (in asm code) passed only two parameters and don't use the return value. The function signature now matches that usage, and doesn't refer to efi-specific types. Parameters and variables now use the cannonical typenames set up by elf.h (Elf_Word, Elf_Addr, etc) instead of raw C types. Hopefully this will prevent suprises as new platforms come along and use this code. The function was renamed from _reloc() to self_reloc() to emphasize its difference from the other elf relocation code found in boot/common. Differential Revision: https://reviews.freebsd.org/D2490
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/*-
|
|
* Copyright (c) 2008-2010 Rui Paulo <rpaulo@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include <elf.h>
|
|
#include <bootstrap.h>
|
|
|
|
#if defined(__aarch64__)
|
|
#define ElfW_Rel Elf64_Rela
|
|
#define ElfW_Dyn Elf64_Dyn
|
|
#define ELFW_R_TYPE ELF64_R_TYPE
|
|
#define ELF_RELA
|
|
#elif defined(__arm__) || defined(__i386__)
|
|
#define ElfW_Rel Elf32_Rel
|
|
#define ElfW_Dyn Elf32_Dyn
|
|
#define ELFW_R_TYPE ELF32_R_TYPE
|
|
#elif defined(__amd64__)
|
|
#define ElfW_Rel Elf64_Rel
|
|
#define ElfW_Dyn Elf64_Dyn
|
|
#define ELFW_R_TYPE ELF64_R_TYPE
|
|
#else
|
|
#error architecture not supported
|
|
#endif
|
|
#if defined(__aarch64__)
|
|
#define RELOC_TYPE_NONE R_AARCH64_NONE
|
|
#define RELOC_TYPE_RELATIVE R_AARCH64_RELATIVE
|
|
#elif defined(__amd64__)
|
|
#define RELOC_TYPE_NONE R_X86_64_NONE
|
|
#define RELOC_TYPE_RELATIVE R_X86_64_RELATIVE
|
|
#elif defined(__arm__)
|
|
#define RELOC_TYPE_NONE R_ARM_NONE
|
|
#define RELOC_TYPE_RELATIVE R_ARM_RELATIVE
|
|
#elif defined(__i386__)
|
|
#define RELOC_TYPE_NONE R_386_NONE
|
|
#define RELOC_TYPE_RELATIVE R_386_RELATIVE
|
|
#endif
|
|
|
|
/*
|
|
* A simple elf relocator.
|
|
*/
|
|
void
|
|
self_reloc(Elf_Addr baseaddr, ElfW_Dyn *dynamic)
|
|
{
|
|
Elf_Word relsz, relent;
|
|
Elf_Addr *newaddr;
|
|
ElfW_Rel *rel;
|
|
ElfW_Dyn *dynp;
|
|
|
|
/*
|
|
* Find the relocation address, its size and the relocation entry.
|
|
*/
|
|
relsz = 0;
|
|
relent = 0;
|
|
for (dynp = dynamic; dynp->d_tag != DT_NULL; dynp++) {
|
|
switch (dynp->d_tag) {
|
|
case DT_REL:
|
|
case DT_RELA:
|
|
rel = (ElfW_Rel *)(dynp->d_un.d_ptr + baseaddr);
|
|
break;
|
|
case DT_RELSZ:
|
|
case DT_RELASZ:
|
|
relsz = dynp->d_un.d_val;
|
|
break;
|
|
case DT_RELENT:
|
|
case DT_RELAENT:
|
|
relent = dynp->d_un.d_val;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Perform the actual relocation.
|
|
*/
|
|
for (; relsz > 0; relsz -= relent) {
|
|
switch (ELFW_R_TYPE(rel->r_info)) {
|
|
case RELOC_TYPE_NONE:
|
|
/* No relocation needs be performed. */
|
|
break;
|
|
|
|
case RELOC_TYPE_RELATIVE:
|
|
/* Address relative to the base address. */
|
|
newaddr = (Elf_Addr *)(rel->r_offset + baseaddr);
|
|
*newaddr += baseaddr;
|
|
/* Add the addend when the ABI uses them */
|
|
#ifdef ELF_RELA
|
|
*newaddr += rel->r_addend;
|
|
#endif
|
|
break;
|
|
default:
|
|
/* XXX: do we need other relocations ? */
|
|
break;
|
|
}
|
|
rel = (ElfW_Rel *) ((caddr_t) rel + relent);
|
|
}
|
|
}
|