osd-contiki/cpu/stm32w108/elfloader-arch.c
Adam Dunkels a5046e83c7 Cleanup and refactoring of the STM32w port
This is a general cleanup of things like code style issues and code structure of the STM32w port to make it more like the rest of Contiki is structured.
2013-03-18 13:31:26 +01:00

177 lines
5.9 KiB
C

/**
* \addtogroup mb851-platform
*
* @{
*/
/*
* Copyright (c) 2009, 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.
*
*/
#include "contiki.h"
#include "elfloader-arch.h"
#include "cfs-coffee-arch.h"
#if 1
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...) do {} while (0)
#endif
#define ELF32_R_TYPE(info) ((unsigned char)(info))
/* Supported relocations */
#define R_ARM_ABS32 2
#define R_ARM_THM_CALL 10
/* Adapted from elfloader-arm.c */
/* word aligned */
static uint32_t datamemory_aligned[(ELFLOADER_DATAMEMORY_SIZE + 3) / 4];
static uint8_t *datamemory = (uint8_t *) datamemory_aligned;
/* halfword aligned */
VAR_AT_SEGMENT(static const uint16_t
textmemory[ELFLOADER_TEXTMEMORY_SIZE / 2], ".elf_text") = {0};
/*---------------------------------------------------------------------------*/
void *
elfloader_arch_allocate_ram(int size)
{
if(size > sizeof(datamemory_aligned)) {
PRINTF("RESERVED RAM TOO SMALL\n");
}
return datamemory;
}
/*---------------------------------------------------------------------------*/
void *
elfloader_arch_allocate_rom(int size)
{
if(size > sizeof(textmemory)) {
PRINTF("RESERVED FLASH TOO SMALL\n");
}
return (void *)textmemory;
}
/*---------------------------------------------------------------------------*/
#define READSIZE sizeof(datamemory_aligned)
void
elfloader_arch_write_rom(int fd, unsigned short textoff, unsigned int size,
char *mem)
{
uint32_t ptr;
int nbytes;
cfs_seek(fd, textoff, CFS_SEEK_SET);
cfs_seek(fd, textoff, CFS_SEEK_SET);
for(ptr = 0; ptr < size; ptr += READSIZE) {
/* Read data from file into RAM. */
nbytes = cfs_read(fd, (unsigned char *)datamemory, READSIZE);
/* Write data to flash. */
stm32w_flash_write((uint32_t) mem, datamemory, nbytes);
}
}
/*---------------------------------------------------------------------------*/
void
elfloader_arch_relocate(int fd,
unsigned int sectionoffset,
char *sectionaddr,
struct elf32_rela *rela, char *addr)
{
unsigned int type;
type = ELF32_R_TYPE(rela->r_info);
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
/* PRINTF("elfloader_arch_relocate: type %d\n", type); */
/* PRINTF("Addr: %p, Addend: %ld\n", addr, rela->r_addend); */
switch (type) {
case R_ARM_ABS32:
{
int32_t addend;
cfs_read(fd, (char *)&addend, 4);
addr += addend;
cfs_seek(fd, -4, CFS_SEEK_CUR);
cfs_write(fd, &addr, 4);
/* elfloader_output_write_segment(output,(char*) &addr, 4); */
PRINTF("%p: addr: %p\n", sectionaddr + rela->r_offset, addr);
}
break;
case R_ARM_THM_CALL:
{
uint16_t instr[2];
int32_t offset;
char *base;
cfs_read(fd, (char *)instr, 4);
cfs_seek(fd, -4, CFS_SEEK_CUR);
/*
* Ignore the addend since it will be zero for calls to symbols,
* and I can't think of a case when doing a relative call to
* a non-symbol position
*/
base = sectionaddr + (rela->r_offset + 4);
if(((instr[1]) & 0xe800) == 0xe800) {
/* BL or BLX */
if(((uint32_t) addr) & 0x1) {
/* BL */
instr[1] |= 0x1800;
} else {
#if defined(__ARM_ARCH_4T__)
return ELFLOADER_UNHANDLED_RELOC;
#else
/* BLX */
instr[1] &= ~0x1800;
instr[1] |= 0x0800;
#endif
}
}
/* Adjust address for BLX */
if((instr[1] & 0x1800) == 0x0800) {
addr = (char *)((((uint32_t) addr) & 0xfffffffd) |
(((uint32_t) base) & 0x00000002));
}
offset = addr - (sectionaddr + (rela->r_offset + 4));
PRINTF("elfloader-arm.c: offset %d\n", (int)offset);
if(offset < -(1 << 22) || offset >= (1 << 22)) {
PRINTF("elfloader-arm.c: offset %d too large for relative call\n",
(int)offset);
}
/* PRINTF("%p: %04x %04x offset: %d addr: %p\n", sectionaddr +rela->r_offset, instr[0], instr[1], (int)offset, addr); */
instr[0] = (instr[0] & 0xf800) | ((offset >> 12) & 0x07ff);
instr[1] = (instr[1] & 0xf800) | ((offset >> 1) & 0x07ff);
cfs_write(fd, &instr, 4);
/* elfloader_output_write_segment(output, (char*)instr, 4); */
/* PRINTF("cfs_write: %04x %04x\n",instr[0], instr[1]); */
}
break;
default:
PRINTF("elfloader-arm.c: unsupported relocation type %d\n", type);
}
}
/** @} */