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contiki/core/loader/elfloader-avr.c

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/*
* 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.
*
*/
#include <stdio.h>
#include <avr/boot.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include "elfloader-arch.h"
#include "lib/mmem.h"
#include <string.h> //memset
#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))
#define DEBUG 0
#if DEBUG
#include <avr/pgmspace.h>
#define PRINTF(FORMAT,args...) printf_P(PSTR(FORMAT),##args)
#else
#define PRINTF(...)
#endif
static struct mmem module_heap;
/*---------------------------------------------------------------------------*/
void*
elfloader_arch_allocate_ram(int size)
{
/* Free previously allocated memory */
/* TODO Assumes memory address 0 can't be allocated, use flag instead? */
if (MMEM_PTR(&module_heap) != 0) {
mmem_free(&module_heap);
}
/* Allocate RAM for module */
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 (void *)0x8000;
}
/*---------------------------------------------------------------------------*/
/* Eliminate compiler warnings for (non-functional) code when flash requires 32 bit addresses and pointers are 16 bit */
#define INCLUDE_APPLICATE_SOURCE 1
#ifdef __GNUC__
#if (FLASHEND > USHRT_MAX) && (__SIZEOF_POINTER__ <= 2)
#undef INCLUDE_APPLICATE_SOURCE
#define INCLUDE_APPLICATE_SOURCE 0
#endif
#if (__SIZEOF_POINTER__ > 2)
#define INCLUDE_32BIT_CODE 1
#endif
#endif
#if INCLUDE_APPLICATE_SOURCE
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 = (unsigned short *) 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, CFS_SEEK_SET);
for (flashptr=(unsigned short *)mem; flashptr < (unsigned short *) 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;
}
}
#endif /* INCLUDE_APPLICATE_SOURCE */
/*---------------------------------------------------------------------------*/
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_SEEK_SET);
cfs_read(fd, instr, 4);
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
type = ELF32_R_TYPE(rela->r_info);
addr += rela->r_addend;
switch(type) {
case R_AVR_NONE:
case R_AVR_32:
PRINTF(PSTR ("elfloader-avr.c: unsupported relocation type: "));
PRINTF("%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 = (((int)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 = (int)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] = (int)addr & 0xff;
instr[1] = ((int)addr >> 8) & 0xff;
cfs_write(fd, instr, 2);
break;
case R_AVR_16_PM: /* 5 */
addr = (char *)((int)addr >> 1);
instr[0] = (int)addr & 0xff;
instr[1] = ((int)addr >> 8) & 0xff;
cfs_write(fd, instr, 2);
break;
case R_AVR_LO8_LDI: /* 6 */
write_ldi(fd, instr, (int)addr);
break;
case R_AVR_HI8_LDI: /* 7 */
write_ldi(fd, instr, (int)addr >> 8);
break;
#if INCLUDE_32BIT_CODE /* 32 bit AVRs */
case R_AVR_HH8_LDI: /* 8 */
write_ldi(fd, instr, (int)addr >> 16);
break;
#endif
case R_AVR_LO8_LDI_NEG: /* 9 */
addr = (char *) (0 - (int)addr);
write_ldi(fd, instr, (int)addr);
break;
case R_AVR_HI8_LDI_NEG: /* 10 */
addr = (char *) (0 - (int)addr);
write_ldi(fd, instr, (int)addr >> 8);
break;
#if INCLUDE_32BIT_CODE /* 32 bit AVRs */
case R_AVR_HH8_LDI_NEG: /* 11 */
addr = (char *)(0 - (int)addr);
write_ldi(fd, instr, (int)addr >> 16);
break;
#endif
case R_AVR_LO8_LDI_PM: /* 12 */
write_ldi(fd, instr, (int)addr >> 1);
break;
case R_AVR_HI8_LDI_PM: /* 13 */
write_ldi(fd, instr, (int)addr >> 9);
break;
#if INCLUDE_32BIT_CODE /* 32 bit AVRs */
case R_AVR_HH8_LDI_PM: /* 14 */
write_ldi(fd, instr, (int)addr >> 17);
break;
#endif
case R_AVR_LO8_LDI_PM_NEG: /* 15 */
addr = (char *) (0 - (int)addr);
write_ldi(fd, instr, (int)addr >> 1);
break;
case R_AVR_HI8_LDI_PM_NEG: /* 16 */
addr = (char *) (0 - (int)addr);
write_ldi(fd, instr, (int)addr >> 9);
break;
#if INCLUDE_32BIT_CODE /* 32 bit AVRs */
case R_AVR_HH8_LDI_PM_NEG: /* 17 */
addr = (char *) (0 - (int)addr);
write_ldi(fd, instr, (int)addr >> 17);
break;
#endif
case R_AVR_CALL: /* 18 */
/* old solution:
addr = ((int16_t)addr >> 1);
instr[2] = (int16_t)addr & 0xff;
instr[3] = (int16_t)addr >> 8;
*/
/* new solution */
instr[2] = (uint8_t) ((int)addr) & 0xff;
instr[3] = ((int)addr) >> 8;
cfs_write(fd, instr, 4);
break;
default:
PRINTF(PSTR ("Unknown relocation type!\n"));
break;
}
}
/*---------------------------------------------------------------------------*/
void
elfloader_unload(void) {
}
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