/*
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* Copyright (c) 2007, Swedish Institute of Computer Science
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* All rights reserved.
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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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* 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
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be 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 INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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* The Contiki dynamic Link Editor (CLE), ELF version.
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*/
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#include <stdio.h>
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#include "contiki.h"
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#include "loader/elf32.h"
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#include "loader/cle.h"
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#define NDEBUG
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#include "lib/assert.h"
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#ifdef NDEBUG
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#define PRINTF(...) do {} while (0)
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#else
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#define PRINTF(...) printf(__VA_ARGS__)
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#endif
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#define R_AVR_NONE 0
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#define R_AVR_32 1
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#define R_AVR_7_PCREL 2
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#define R_AVR_13_PCREL 3
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#define R_AVR_16 4
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#define R_AVR_16_PM 5
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#define R_AVR_LO8_LDI 6
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#define R_AVR_HI8_LDI 7
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#define R_AVR_HH8_LDI 8
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#define R_AVR_LO8_LDI_NEG 9
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#define R_AVR_HI8_LDI_NEG 10
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#define R_AVR_HH8_LDI_NEG 11
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#define R_AVR_LO8_LDI_PM 12
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#define R_AVR_HI8_LDI_PM 13
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#define R_AVR_HH8_LDI_PM 14
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#define R_AVR_LO8_LDI_PM_NEG 15
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#define R_AVR_HI8_LDI_PM_NEG 16
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#define R_AVR_HH8_LDI_PM_NEG 17
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#define R_AVR_CALL 18
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/*
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* Writing relocs is machine dependent and this function is AVR
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* specific!
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*/
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int
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cle_write_reloc(void *pos_,
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const struct elf32_rela *rela,
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cle_addr addr,
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const struct cle_info *info)
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{
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unsigned char *pos = pos_;
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unsigned char byte;
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switch(ELF32_R_TYPE(rela->r_info)) {
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default:
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PRINTF("cle_upd_reloc: unsupported relocation type: %d\n",
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ELF32_R_TYPE(rela->r_info));
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return CLE_UNKNOWN_RELOC;
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case R_AVR_7_PCREL: /* 2 */
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/* Reloc in bits 0x03f8 (0000 00kk kkkk k000). */
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byte = addr - (/* text */ + rela->r_offset + 2);
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byte = byte >> 1;
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pos[0] = (pos[0] & 0x07) | (byte << 3); /* 0xf8 */
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pos[1] = (pos[1] & 0xfc) | (byte >> 5); /* 0x03 */
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return CLE_OK;
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case R_AVR_13_PCREL: /* 3 */
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/* Reloc in bits 0x0fff (0000 kkkk kkkk kkkk). */
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addr = addr - (info->text + rela->r_offset + 2);
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addr = addr >> 1;
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pos[0] = addr;
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pos[1] = (pos[1] & 0xf0) | ((addr >> 8) & 0x0f);
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return CLE_OK;
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case R_AVR_CALL: /* 18 */
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addr = addr >> 1;
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pos[2] = addr;
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pos[3] = addr >> 8;
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return CLE_OK;
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case R_AVR_16: /* 4 */
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pos[0] = addr;
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pos[1] = addr >> 8;
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return CLE_OK;
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case R_AVR_16_PM: /* 5 */
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addr = addr >> 1;
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pos[0] = addr;
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pos[1] = addr >> 8;
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return CLE_OK;
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/*
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* Remaining relocs all have immediate value in bits 0x0f0f.
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*/
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case R_AVR_LO8_LDI: /* 6 */
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byte = addr;
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break;
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case R_AVR_HI8_LDI: /* 7 */
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byte = addr >> 8;
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break;
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case R_AVR_HH8_LDI: /* 8 */
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byte = addr >> 16;
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break;
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case R_AVR_LO8_LDI_NEG: /* 9 */
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byte = (-addr);
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break;
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case R_AVR_HI8_LDI_NEG: /* 10 */
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byte = (-addr) >> 8;
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break;
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case R_AVR_HH8_LDI_NEG: /* 11 */
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byte = (-addr) >> 16;
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break;
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case R_AVR_LO8_LDI_PM: /* 12 */
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byte = addr >> 1;
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break;
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case R_AVR_HI8_LDI_PM: /* 13 */
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byte = addr >> 9;
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break;
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case R_AVR_HH8_LDI_PM: /* 14 */
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byte = addr >> 17;
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break;
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case R_AVR_LO8_LDI_PM_NEG: /* 15 */
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byte = (-addr) >> 1;
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break;
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case R_AVR_HI8_LDI_PM_NEG: /* 16 */
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byte = (-addr) >> 9;
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break;
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case R_AVR_HH8_LDI_PM_NEG: /* 17 */
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byte = (-addr) >> 17;
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break;
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}
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/* Relocation in bits 0x0f0f (0000 kkkk 0000 kkkk). */
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pos[0] = (pos[0] & 0xf0) | (byte & 0x0f);
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pos[1] = (pos[1] & 0xf0) | (byte >> 4);
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return CLE_OK;
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}
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