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/* =================================================================
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*
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* relocate_arm.c
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*
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* Relocation types for the ARM processor (Little Endian).
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*
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* =================================================================
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* ####ECOSGPLCOPYRIGHTBEGIN####
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* -------------------------------------------
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* This file is part of eCos, the Embedded Configurable Operating System.
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* Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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*
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* eCos is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 or (at your option)
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* any later version.
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*
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* eCos is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with eCos; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* As a special exception, if other files instantiate templates or
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* use macros or inline functions from this file, or you compile this
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* file and link it with other works to produce a work based on this
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* file, this file does not by itself cause the resulting work to be
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* covered by the GNU General Public License. However the source code
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* for this file must still be made available in accordance with
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* section (3) of the GNU General Public License.
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*
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* This exception does not invalidate any other reasons why a work
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* based on this file might be covered by the GNU General Public
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* License.
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*
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* -------------------------------------------
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* ####ECOSGPLCOPYRIGHTEND####
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* =================================================================
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* #####DESCRIPTIONBEGIN####
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*
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* Author(s): Anthony Tonizzo (atonizzo@gmail.com)
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* Contributors: Sergei Gavrikov (sergei.gavrikov@gmail.com)
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* Date: 2008-12-01
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* Purpose:
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* Description:
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*
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* ####DESCRIPTIONEND####
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*
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* =================================================================
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*/
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#include <cyg/infra/diag.h> // For diagnostic printing.
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <cyg/hal/hal_cache.h>
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#include <cyg/hal/hal_io.h>
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#include <pkgconf/objloader.h>
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#include <cyg/objloader/elf.h>
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#include <cyg/objloader/objelf.h>
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#ifdef CYGPKG_HAL_ARM
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void
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cyg_ldr_flush_cache(void)
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{
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HAL_DCACHE_SYNC();
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HAL_ICACHE_SYNC();
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}
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#if CYGPKG_SERVICES_OBJLOADER_DEBUG_LEVEL > 1
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// Always 16 characters long, with blank padding is necessary, so
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// the printing is pretty. If the name is longer than 16, shorten it.
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// We print the relocation symbols only is
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// CYGPKG_SERVICES_OBJLOADER_DEBUG_LEVEL is set to 2.
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char *relocation_name[] =
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{
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"", "R_ARM_PC24 ", "R_ARM_ABS32 ", "", "", "", "", "", "", "",
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"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
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"", "", "R_ARM_CALL ", "R_ARM_JUMP24 ", "", "", "", "",
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"", "", "", "", "", "", "R_ARM_V4BX "
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};
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#endif
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// sym_type Type of relocation to apply,
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// mem Address in memory to modify (relocate).
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// sym_value The value of the symbol to use for the relocation.
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// The proper relocation to apply (i.e. the proper use of mem and sym_value)
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// depend on the relocation to apply. The number and types of relocations
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// that must be supported by any given architecture is spelled in the ELF/EABI
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// guide for that architecture.
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cyg_int32
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cyg_ldr_relocate(cyg_int32 sym_type, cyg_uint32 mem, cyg_int32 sym_value)
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{
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cyg_int32 offset;
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volatile cyg_uint32 *mem_addr = (cyg_uint32 *)mem;
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switch(sym_type)
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{
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case R_ARM_ABS32:
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offset = *mem_addr;
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*mem_addr = offset + sym_value;
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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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offset = (*mem_addr & 0x00FFFFFF) << 2;
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if (offset & 0x02000000)
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offset -= 0x04000000; // Sign extend.
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*mem_addr &= 0xff000000; // Mask off the entire offset bits.
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offset = sym_value - mem + offset; // This is the new offset.
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if ((offset & 0x03) || (offset >= (cyg_int32)0x04000000) ||
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(offset <= (cyg_int32)0xFC000000))
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return -1;
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*mem_addr |= (offset >> 2) & 0x00FFFFFF;
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break;
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case R_ARM_V4BX:
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// For now only ARMv4T and later cores (with Thumb) are supported.
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break;
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default:
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CYG_ASSERT(0, ("FIXME: Unknown relocation value!!!\r\n"));
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return -1;
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}
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return 0;
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}
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#endif // CYGPKG_HAL_ARM
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