/* * Copyright (c) 2007, Swedish Institute of Computer Science * 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. * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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. * * @(#)$Id: cle_avr.c,v 1.3 2007/06/04 17:50:25 bg- Exp $ */ /* * The Contiki dynamic Link Editor (CLE), ELF version. */ #include <stdio.h> #include "contiki.h" #include "loader/elf32.h" #include "loader/cle.h" #define NDEBUG #include "lib/assert.h" #ifdef NDEBUG #define PRINTF(...) do {} while (0) #else #define PRINTF(...) printf(__VA_ARGS__) #endif #define R_AVR_NONE 0 #define R_AVR_32 1 #define R_AVR_7_PCREL 2 #define R_AVR_13_PCREL 3 #define R_AVR_16 4 #define R_AVR_16_PM 5 #define R_AVR_LO8_LDI 6 #define R_AVR_HI8_LDI 7 #define R_AVR_HH8_LDI 8 #define R_AVR_LO8_LDI_NEG 9 #define R_AVR_HI8_LDI_NEG 10 #define R_AVR_HH8_LDI_NEG 11 #define R_AVR_LO8_LDI_PM 12 #define R_AVR_HI8_LDI_PM 13 #define R_AVR_HH8_LDI_PM 14 #define R_AVR_LO8_LDI_PM_NEG 15 #define R_AVR_HI8_LDI_PM_NEG 16 #define R_AVR_HH8_LDI_PM_NEG 17 #define R_AVR_CALL 18 /* * Writing relocs is machine dependent and this function is AVR * specific! */ int cle_write_reloc(void *pos_, const struct elf32_rela *rela, cle_addr addr, const struct cle_info *info) { unsigned char *pos = pos_; unsigned char byte; switch(ELF32_R_TYPE(rela->r_info)) { default: PRINTF("cle_upd_reloc: unsupported relocation type: %d\n", ELF32_R_TYPE(rela->r_info)); return CLE_UNKNOWN_RELOC; case R_AVR_7_PCREL: /* 2 */ /* Reloc in bits 0x03f8 (0000 00kk kkkk k000). */ byte = addr - (/* text */ + rela->r_offset + 2); byte = byte >> 1; pos[0] = (pos[0] & 0x07) | (byte << 3); /* 0xf8 */ pos[1] = (pos[1] & 0xfc) | (byte >> 5); /* 0x03 */ return CLE_OK; case R_AVR_13_PCREL: /* 3 */ /* Reloc in bits 0x0fff (0000 kkkk kkkk kkkk). */ addr = addr - (info->text + rela->r_offset + 2); addr = addr >> 1; pos[0] = addr; pos[1] = (pos[1] & 0xf0) | ((addr >> 8) & 0x0f); return CLE_OK; case R_AVR_CALL: /* 18 */ addr = addr >> 1; pos[2] = addr; pos[3] = addr >> 8; return CLE_OK; case R_AVR_16: /* 4 */ pos[0] = addr; pos[1] = addr >> 8; return CLE_OK; case R_AVR_16_PM: /* 5 */ addr = addr >> 1; pos[0] = addr; pos[1] = addr >> 8; return CLE_OK; /* * Remaining relocs all have immediate value in bits 0x0f0f. */ case R_AVR_LO8_LDI: /* 6 */ byte = addr; break; case R_AVR_HI8_LDI: /* 7 */ byte = addr >> 8; break; case R_AVR_HH8_LDI: /* 8 */ byte = addr >> 16; break; case R_AVR_LO8_LDI_NEG: /* 9 */ byte = (-addr); break; case R_AVR_HI8_LDI_NEG: /* 10 */ byte = (-addr) >> 8; break; case R_AVR_HH8_LDI_NEG: /* 11 */ byte = (-addr) >> 16; break; case R_AVR_LO8_LDI_PM: /* 12 */ byte = addr >> 1; break; case R_AVR_HI8_LDI_PM: /* 13 */ byte = addr >> 9; break; case R_AVR_HH8_LDI_PM: /* 14 */ byte = addr >> 17; break; case R_AVR_LO8_LDI_PM_NEG: /* 15 */ byte = (-addr) >> 1; break; case R_AVR_HI8_LDI_PM_NEG: /* 16 */ byte = (-addr) >> 9; break; case R_AVR_HH8_LDI_PM_NEG: /* 17 */ byte = (-addr) >> 17; break; } /* Relocation in bits 0x0f0f (0000 kkkk 0000 kkkk). */ pos[0] = (pos[0] & 0xf0) | (byte & 0x0f); pos[1] = (pos[1] & 0xf0) | (byte >> 4); return CLE_OK; }