/*
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* Copyright (c) 2005, 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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* This file is part of the Contiki operating system.
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*
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*/
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#include <stdio.h>
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#include <avr/boot.h>
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#include <avr/pgmspace.h>
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#include <avr/interrupt.h>
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#include "elfloader-arch.h"
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#include "lib/mmem.h"
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#include <string.h> //memset
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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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#define ELF32_R_TYPE(info) ((unsigned char)(info))
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#define DEBUG 0
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#if DEBUG
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#include <avr/pgmspace.h>
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#define PRINTF(FORMAT,args...) printf_P(PSTR(FORMAT),##args)
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#else
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#define PRINTF(...)
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#endif
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static struct mmem module_heap;
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/*---------------------------------------------------------------------------*/
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void*
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elfloader_arch_allocate_ram(int size)
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{
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/* Free previously allocated memory */
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/* TODO Assumes memory address 0 can't be allocated, use flag instead? */
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if (MMEM_PTR(&module_heap) != 0) {
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mmem_free(&module_heap);
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}
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/* Allocate RAM for module */
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if (mmem_alloc (&module_heap, size) == 0) {
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return NULL;
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}
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return (char*)MMEM_PTR(&module_heap);
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}
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/*---------------------------------------------------------------------------*/
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/* TODO: Currently, modules are written to the fixed address 0x10000. Since
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* flash rom uses word addresses on the AVR, we return 0x8000 here
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*/
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void*
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elfloader_arch_allocate_rom(int size)
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{
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return (void *)0x8000;
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}
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/*---------------------------------------------------------------------------*/
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/* Eliminate compiler warnings for (non-functional) code when flash requires 32 bit addresses and pointers are 16 bit */
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#define INCLUDE_APPLICATE_SOURCE 1
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#ifdef __GNUC__
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#if (FLASHEND > USHRT_MAX) && (__SIZEOF_POINTER__ <= 2)
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#undef INCLUDE_APPLICATE_SOURCE
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#define INCLUDE_APPLICATE_SOURCE 0
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#endif
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#if (__SIZEOF_POINTER__ > 2)
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#define INCLUDE_32BIT_CODE 1
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#endif
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#endif
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#if INCLUDE_APPLICATE_SOURCE
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BOOTLOADER_SECTION void
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elfloader_arch_write_rom(int fd, unsigned short textoff, unsigned int size, char *mem)
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{
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unsigned char buf[SPM_PAGESIZE];
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unsigned short* flashptr = (unsigned short *) mem;
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// Sanity-check size of loadable module
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if (size <= 0)
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return;
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// Seek to patched module and burn it to flash (in chunks of
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// size SPM_PAGESIZE, i.e. 256 bytes on the ATmega128)
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cfs_seek(fd, textoff, CFS_SEEK_SET);
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for (flashptr=(unsigned short *)mem; flashptr < (unsigned short *) mem + size; flashptr += SPM_PAGESIZE) {
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memset (buf, 0, SPM_PAGESIZE);
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cfs_read(fd, buf, SPM_PAGESIZE);
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// Disable interrupts
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uint8_t sreg;
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sreg = SREG;
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cli ();
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// Erase flash page
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boot_page_erase (flashptr);
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boot_spm_busy_wait ();
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unsigned short *origptr = flashptr;
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int i;
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// Store data into page buffer
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for(i = 0; i < SPM_PAGESIZE; i+=2) {
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boot_page_fill (flashptr, (uint16_t)((buf[i+1] << 8) | buf[i]));
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PORTB = 0xff - 7;
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++flashptr;
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}
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// Burn page
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boot_page_write (origptr);
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boot_spm_busy_wait();
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// Reenable RWW sectin
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boot_rww_enable ();
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boot_spm_busy_wait ();
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// Restore original interrupt settings
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SREG = sreg;
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}
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}
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#endif /* INCLUDE_APPLICATE_SOURCE */
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/*---------------------------------------------------------------------------*/
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static void
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write_ldi(int fd, unsigned char *instr, unsigned char byte)
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{
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instr[0] = (instr[0] & 0xf0) | (byte & 0x0f);
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instr[1] = (instr[1] & 0xf0) | (byte >> 4);
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cfs_write (fd, instr, 2);
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}
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/*---------------------------------------------------------------------------*/
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void
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elfloader_arch_relocate(int fd, unsigned int sectionoffset,
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// struct elf32_rela *rela, elf32_addr addr)
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char *sectionaddr,
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struct elf32_rela *rela, char *addr)
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{
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unsigned int type;
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unsigned char instr[4];
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cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
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cfs_read(fd, instr, 4);
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cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
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type = ELF32_R_TYPE(rela->r_info);
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addr += rela->r_addend;
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switch(type) {
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case R_AVR_NONE:
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case R_AVR_32:
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PRINTF(PSTR ("elfloader-avr.c: unsupported relocation type: "));
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PRINTF("%d\n", type);
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break;
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case R_AVR_7_PCREL: { /* 4 */
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/*
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* Relocation is relative to PC. -2: branch instructions add 2 to PC.
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* Do not use >> 1 for division because branch instructions use
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* signed offsets.
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*/
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int16_t a = (((int)addr - rela->r_offset -2) / 2);
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instr[0] |= (a << 3) & 0xf8;
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instr[1] |= (a >> 5) & 0x03;
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cfs_write(fd, instr, 2);
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}
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break;
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case R_AVR_13_PCREL: { /* 3 */
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/*
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* Relocation is relative to PC. -2: RJMP adds 2 to PC.
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* Do not use >> 1 for division because RJMP uses signed offsets.
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*/
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int16_t a = (int)addr / 2;
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a -= rela->r_offset / 2;
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a--;
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instr[0] |= a & 0xff;
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instr[1] |= (a >> 8) & 0x0f;
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cfs_write(fd, instr, 2);
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}
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break;
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case R_AVR_16: /* 4 */
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instr[0] = (int)addr & 0xff;
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instr[1] = ((int)addr >> 8) & 0xff;
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cfs_write(fd, instr, 2);
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break;
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case R_AVR_16_PM: /* 5 */
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addr = (char *)((int)addr >> 1);
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instr[0] = (int)addr & 0xff;
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instr[1] = ((int)addr >> 8) & 0xff;
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cfs_write(fd, instr, 2);
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break;
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case R_AVR_LO8_LDI: /* 6 */
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write_ldi(fd, instr, (int)addr);
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break;
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case R_AVR_HI8_LDI: /* 7 */
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write_ldi(fd, instr, (int)addr >> 8);
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break;
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#if INCLUDE_32BIT_CODE /* 32 bit AVRs */
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case R_AVR_HH8_LDI: /* 8 */
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write_ldi(fd, instr, (int)addr >> 16);
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break;
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#endif
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case R_AVR_LO8_LDI_NEG: /* 9 */
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addr = (char *) (0 - (int)addr);
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write_ldi(fd, instr, (int)addr);
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break;
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case R_AVR_HI8_LDI_NEG: /* 10 */
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addr = (char *) (0 - (int)addr);
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write_ldi(fd, instr, (int)addr >> 8);
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break;
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#if INCLUDE_32BIT_CODE /* 32 bit AVRs */
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case R_AVR_HH8_LDI_NEG: /* 11 */
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addr = (char *)(0 - (int)addr);
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write_ldi(fd, instr, (int)addr >> 16);
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break;
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#endif
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case R_AVR_LO8_LDI_PM: /* 12 */
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write_ldi(fd, instr, (int)addr >> 1);
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break;
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case R_AVR_HI8_LDI_PM: /* 13 */
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write_ldi(fd, instr, (int)addr >> 9);
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break;
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#if INCLUDE_32BIT_CODE /* 32 bit AVRs */
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case R_AVR_HH8_LDI_PM: /* 14 */
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write_ldi(fd, instr, (int)addr >> 17);
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break;
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#endif
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case R_AVR_LO8_LDI_PM_NEG: /* 15 */
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addr = (char *) (0 - (int)addr);
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write_ldi(fd, instr, (int)addr >> 1);
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break;
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case R_AVR_HI8_LDI_PM_NEG: /* 16 */
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addr = (char *) (0 - (int)addr);
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write_ldi(fd, instr, (int)addr >> 9);
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break;
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#if INCLUDE_32BIT_CODE /* 32 bit AVRs */
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case R_AVR_HH8_LDI_PM_NEG: /* 17 */
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addr = (char *) (0 - (int)addr);
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write_ldi(fd, instr, (int)addr >> 17);
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break;
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#endif
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case R_AVR_CALL: /* 18 */
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/* old solution:
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addr = ((int16_t)addr >> 1);
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instr[2] = (int16_t)addr & 0xff;
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instr[3] = (int16_t)addr >> 8;
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*/
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/* new solution */
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instr[2] = (uint8_t) ((int)addr) & 0xff;
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instr[3] = ((int)addr) >> 8;
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cfs_write(fd, instr, 4);
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break;
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default:
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PRINTF(PSTR ("Unknown relocation type!\n"));
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break;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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elfloader_unload(void) {
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}
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