/* * Copyright (c) 2005, 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. * * This file is part of the Contiki operating system. * * @(#)$Id: elfloader-avr.c,v 1.4 2006/12/22 17:10:54 barner Exp $ */ #include <stdio.h> #include <avr/boot.h> #include <avr/pgmspace.h> #include <avr/interrupt.h> #include "dev/rs232.h" #include "elfloader-arch.h" #include "lib/mmem.h" #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 #define ELF32_R_TYPE(info) ((unsigned char)(info)) static struct mmem module_heap; /*---------------------------------------------------------------------------*/ void* elfloader_arch_allocate_ram(int size) { /* Allocate RAM for module (TODO: we leak the memory) */ if (mmem_alloc (&module_heap, size) == 0) { return NULL; } return (char*)MMEM_PTR(&module_heap); } /*---------------------------------------------------------------------------*/ /* TODO: Currently, modules are written to the fixed address 0x10000. Since * flash rom uses word addresses on the AVR, we return 0x8000 here */ void* elfloader_arch_allocate_rom(int size) { return 0x8000; } /*---------------------------------------------------------------------------*/ BOOTLOADER_SECTION void elfloader_arch_write_rom(int fd, unsigned short textoff, unsigned int size, char *mem) { unsigned char buf[SPM_PAGESIZE]; unsigned short* flashptr = mem; // Sanity-check size of loadable module if (size <= 0) return; // Seek to patched module and burn it to flash (in chunks of // size SPM_PAGESIZE, i.e. 256 bytes on the ATmega128) cfs_seek(fd, textoff); for (flashptr=mem; flashptr < mem + size; flashptr += SPM_PAGESIZE) { memset (buf, 0, SPM_PAGESIZE); cfs_read(fd, buf, SPM_PAGESIZE); // Disable interrupts uint8_t sreg; sreg = SREG; cli (); // Erase flash page boot_page_erase (flashptr); boot_spm_busy_wait (); unsigned short *origptr = flashptr; int i; // Store data into page buffer for(i = 0; i < SPM_PAGESIZE; i+=2) { boot_page_fill (flashptr, (uint16_t)((buf[i+1] << 8) | buf[i])); PORTB = 0xff - 7; ++flashptr; } // Burn page boot_page_write (origptr); boot_spm_busy_wait(); // Reenable RWW sectin boot_rww_enable (); boot_spm_busy_wait (); // Restore original interrupt settings SREG = sreg; } } /*---------------------------------------------------------------------------*/ static void write_ldi(int fd, unsigned char *instr, unsigned char byte) { instr[0] = (instr[0] & 0xf0) | (byte & 0x0f); instr[1] = (instr[1] & 0xf0) | (byte >> 4); cfs_write (fd, instr, 2); } /*---------------------------------------------------------------------------*/ void elfloader_arch_relocate(int fd, unsigned int sectionoffset, // struct elf32_rela *rela, elf32_addr addr) char *sectionaddr, struct elf32_rela *rela, char *addr) { unsigned int type; unsigned char instr[4]; cfs_seek(fd, sectionoffset + rela->r_offset); cfs_read(fd, instr, 4); cfs_seek(fd, sectionoffset + rela->r_offset); type = ELF32_R_TYPE(rela->r_info); addr += rela->r_addend; switch(type) { case R_AVR_NONE: case R_AVR_32: rs232_print_p (RS232_PORT_1, PSTR ("elfloader-avr.c: unsupported relocation type: ")); rs232_printf (RS232_PORT_1, "%d\n", type); break; case R_AVR_7_PCREL: { /* 4 */ /* * Relocation is relative to PC. -2: branch instructions add 2 to PC. * Do not use >> 1 for division because branch instructions use * signed offsets. */ int16_t a = (((int16_t)addr - rela->r_offset -2) / 2); instr[0] |= (a << 3) & 0xf8; instr[1] |= (a >> 5) & 0x03; cfs_write(fd, instr, 2); } break; case R_AVR_13_PCREL: { /* 3 */ /* * Relocation is relative to PC. -2: RJMP adds 2 to PC. * Do not use >> 1 for division because RJMP uses signed offsets. */ int16_t a = (int16_t)addr / 2; a -= rela->r_offset / 2; a--; instr[0] |= a & 0xff; instr[1] |= (a >> 8) & 0x0f; cfs_write(fd, instr, 2); } break; case R_AVR_16: /* 4 */ instr[0] = (int16_t)addr & 0xff; instr[1] = ((int16_t)addr >> 8) & 0xff; cfs_write(fd, instr, 2); break; case R_AVR_16_PM: /* 5 */ addr = ((int16_t)addr >> 1); instr[0] = (int16_t)addr & 0xff; instr[1] = ((int16_t)addr >> 8) & 0xff; cfs_write(fd, instr, 2); break; case R_AVR_LO8_LDI: /* 6 */ write_ldi(fd, instr, (int16_t)addr); break; case R_AVR_HI8_LDI: /* 7 */ write_ldi(fd, instr, (int16_t)addr >> 8); break; case R_AVR_HH8_LDI: /* 8 */ write_ldi(fd, instr, (int16_t)addr >> 16); break; case R_AVR_LO8_LDI_NEG: /* 9 */ addr = (0 - (int16_t)addr); write_ldi(fd, instr, (int16_t)addr); break; case R_AVR_HI8_LDI_NEG: /* 10 */ addr = (0 - (int16_t)addr); write_ldi(fd, instr, (int16_t)addr >> 8); break; case R_AVR_HH8_LDI_NEG: /* 11 */ addr = (0 - (int16_t)addr); write_ldi(fd, instr, (int16_t)addr >> 16); break; case R_AVR_LO8_LDI_PM: /* 12 */ write_ldi(fd, instr, (int16_t)addr >> 1); break; case R_AVR_HI8_LDI_PM: /* 13 */ write_ldi(fd, instr, (int16_t)addr >> 9); break; case R_AVR_HH8_LDI_PM: /* 14 */ write_ldi(fd, instr, (int16_t)addr >> 17); break; case R_AVR_LO8_LDI_PM_NEG: /* 15 */ addr = (0 - (int16_t)addr); write_ldi(fd, instr, (int16_t)addr >> 1); break; case R_AVR_HI8_LDI_PM_NEG: /* 16 */ addr = (0 - (int16_t)addr); write_ldi(fd, instr, (int16_t)addr >> 9); break; case R_AVR_HH8_LDI_PM_NEG: /* 17 */ addr = (0 - (int16_t)addr); write_ldi(fd, instr, (int16_t)addr >> 17); break; case R_AVR_CALL: /* 18 */ addr = ((int16_t)addr >> 1); instr[2] = (int16_t)addr & 0xff; instr[3] = (int16_t)addr >> 8; cfs_write(fd, instr, 4); break; default: rs232_print_p (RS232_PORT_1, PSTR ("Unknown reloation type!\n")); break; } } /*---------------------------------------------------------------------------*/ void elfloader_unload(void) { }