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nes-proj/core/loader/elfloader-msp430x.c

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/*
* Copyright (c) 2015, Indian Institute of 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.
*
*/
/**
* \file
* MSP430x elfloader.
* \author
* Sumankumar Panchal <suman@ece.iisc.ernet.in>
*
*/
#include "contiki.h"
#include "loader/elfloader.h"
#include "loader/elfloader-arch.h"
#include "cfs/cfs.h"
#include "loader/symtab.h"
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include "dev/flash.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...) do {} while(0)
#endif
#define EI_NIDENT 16
struct elf32_ehdr {
unsigned char e_ident[EI_NIDENT]; /* ident bytes */
elf32_half e_type; /* file type */
elf32_half e_machine; /* target machine */
elf32_word e_version; /* file version */
elf32_addr e_entry; /* start address */
elf32_off e_phoff; /* phdr file offset */
elf32_off e_shoff; /* shdr file offset */
elf32_word e_flags; /* file flags */
elf32_half e_ehsize; /* sizeof ehdr */
elf32_half e_phentsize; /* sizeof phdr */
elf32_half e_phnum; /* number phdrs */
elf32_half e_shentsize; /* sizeof shdr */
elf32_half e_shnum; /* number shdrs */
elf32_half e_shstrndx; /* shdr string index */
};
/* Values for e_type. */
#define ET_NONE 0 /* Unknown type. */
#define ET_REL 1 /* Relocatable. */
#define ET_EXEC 2 /* Executable. */
#define ET_DYN 3 /* Shared object. */
#define ET_CORE 4 /* Core file. */
struct elf32_shdr {
elf32_word sh_name; /* section name */
elf32_word sh_type; /* SHT_... */
elf32_word sh_flags; /* SHF_... */
elf32_addr sh_addr; /* virtual address */
elf32_off sh_offset; /* file offset */
elf32_word sh_size; /* section size */
elf32_word sh_link; /* misc info */
elf32_word sh_info; /* misc info */
elf32_word sh_addralign; /* memory alignment */
elf32_word sh_entsize; /* entry size if table */
};
/* sh_type */
#define SHT_NULL 0 /* inactive */
#define SHT_PROGBITS 1 /* program defined information */
#define SHT_SYMTAB 2 /* symbol table section */
#define SHT_STRTAB 3 /* string table section */
#define SHT_RELA 4 /* relocation section with addends*/
#define SHT_HASH 5 /* symbol hash table section */
#define SHT_DYNAMIC 6 /* dynamic section */
#define SHT_NOTE 7 /* note section */
#define SHT_NOBITS 8 /* no space section */
#define SHT_REL 9 /* relation section without addends */
#define SHT_SHLIB 10 /* reserved - purpose unknown */
#define SHT_DYNSYM 11 /* dynamic symbol table section */
#define SHT_LOPROC 0x70000000 /* reserved range for processor */
#define SHT_HIPROC 0x7fffffff /* specific section header types */
#define SHT_LOUSER 0x80000000 /* reserved range for application */
#define SHT_HIUSER 0xffffffff /* specific indexes */
struct elf32_rel {
elf32_addr r_offset; /* Location to be relocated. */
elf32_word r_info; /* Relocation type and symbol index. */
};
struct elf32_sym {
elf32_word st_name; /* String table index of name. */
elf32_addr st_value; /* Symbol value. */
elf32_word st_size; /* Size of associated object. */
unsigned char st_info; /* Type and binding information. */
unsigned char st_other; /* Reserved (not used). */
elf32_half st_shndx; /* Section index of symbol. */
};
#define ELF32_R_SYM(info) ((info) >> 8)
struct relevant_section {
unsigned char number;
unsigned int offset;
char *address;
};
char elfloader_unknown[30]; /* Name that caused link error. */
struct process *const *elfloader_autostart_processes;
static struct relevant_section bss, data, rodata, rodatafar, text, textfar;
static const unsigned char elf_magic_header[] =
{ 0x7f, 0x45, 0x4c, 0x46, /* 0x7f, 'E', 'L', 'F' */
0x01, /* Only 32-bit objects. */
0x01, /* Only LSB data. */
0x01, /* Only ELF version 1. */
};
/* relocation type */
#define R_MSP430_NONE 0
#define R_MSP430_32 1
#define R_MSP430_10_PCREL 2
#define R_MSP430_16 3
#define R_MSP430_16_PCREL 4
#define R_MSP430_16_BYTE 5
#define R_MSP430_16_PCREL_BYTE 6
#define R_MSP430_2X_PCREL 7
#define R_MSP430_RL_PCREL 8
#define R_MSP430X_SRC_BYTE 9
#define R_MSP430X_SRC 10
#define R_MSP430X_DST_BYTE 11
#define R_MSP430X_DST 12
#define R_MSP430X_DST_2ND_BYTE 13
#define R_MSP430X_DST_2ND 14
#define R_MSP430X_PCREL_SRC_BYTE 15
#define R_MSP430X_PCREL_SRC 16
#define R_MSP430X_PCREL_DST_BYTE 17
#define R_MSP430X_PCREL_DST 18
#define R_MSP430X_PCREL_DST_2ND 19
#define R_MSP430X_PCREL_DST_2ND_BYTE 20
#define R_MSP430X_S_BYTE 21
#define R_MSP430X_S 22
#define R_MSP430X_D_BYTE 23
#define R_MSP430X_D 24
#define R_MSP430X_PCREL_D 25
#define R_MSP430X_INDXD 26
#define R_MSP430X_PCREL_INDXD 27
#define R_MSP430_10 28
#define ELF32_R_TYPE(info) ((unsigned char)(info))
static uint16_t datamemory_aligned[ELFLOADER_DATAMEMORY_SIZE / 2 + 1];
static uint8_t *datamemory = (uint8_t *)datamemory_aligned;
#if ELFLOADER_CONF_TEXT_IN_ROM
static const char textmemory[ELFLOADER_TEXTMEMORY_SIZE] = { 0 };
#else /* ELFLOADER_CONF_TEXT_IN_ROM */
static char textmemory[ELFLOADER_TEXTMEMORY_SIZE];
#endif /* ELFLOADER_CONF_TEXT_IN_ROM */
/*---------------------------------------------------------------------------*/
static void
seek_read(int fd, unsigned int offset, char *buf, int len)
{
cfs_seek(fd, offset, CFS_SEEK_SET);
cfs_read(fd, buf, len);
#if DEBUG
{
int i;
PRINTF("seek_read: Read len %d from offset %d\n",
len, offset);
for(i = 0; i < len; ++i) {
PRINTF("%02x ", buf[i]);
}
printf("\n");
}
#endif /* DEBUG */
}
/*---------------------------------------------------------------------------*/
static void *
find_local_symbol(int fd, const char *symbol,
unsigned int symtab, unsigned short symtabsize,
unsigned int strtab)
{
struct elf32_sym s;
unsigned int a;
char name[30];
struct relevant_section *sect;
for(a = symtab; a < symtab + symtabsize; a += sizeof(s)) {
seek_read(fd, a, (char *)&s, sizeof(s));
if(s.st_name != 0) {
seek_read(fd, strtab + s.st_name, name, sizeof(name));
if(strcmp(name, symbol) == 0) {
if(s.st_shndx == bss.number) {
sect = &bss;
} else if(s.st_shndx == data.number) {
sect = &data;
} else if(s.st_shndx == rodatafar.number) {
sect = &rodatafar;
} else if(s.st_shndx == textfar.number) {
sect = &textfar;
} else {
return NULL;
}
return &(sect->address[s.st_value]);
}
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
static int
relocate_section(int fd,
unsigned int section, unsigned short size,
unsigned int sectionaddr,
char *sectionbase,
unsigned int strs,
unsigned int strtab,
unsigned int symtab, unsigned short symtabsize,
unsigned char using_relas)
{
/*
* sectionbase added; runtime start address of current section
*/
struct elf32_rela rela; /* Now used both for rel and rela data! */
int rel_size = 0;
struct elf32_sym s;
unsigned int a;
char name[30];
char *addr;
struct relevant_section *sect;
/* determine correct relocation entry sizes */
if(using_relas) {
rel_size = sizeof(struct elf32_rela);
} else {
rel_size = sizeof(struct elf32_rel);
}
for(a = section; a < section + size; a += rel_size) {
seek_read(fd, a, (char *)&rela, rel_size);
seek_read(fd,
symtab + sizeof(struct elf32_sym) * ELF32_R_SYM(rela.r_info),
(char *)&s, sizeof(s));
if(s.st_name != 0) {
seek_read(fd, strtab + s.st_name, name, sizeof(name));
PRINTF("name: %s\n", name);
addr = (char *)symtab_lookup(name);
if(addr == NULL) {
PRINTF("name not found in global: %s\n", name);
addr = find_local_symbol(fd, name, symtab, symtabsize, strtab);
PRINTF("found address %p\n", addr);
}
if(addr == NULL) {
if(s.st_shndx == bss.number) {
sect = &bss;
} else if(s.st_shndx == data.number) {
sect = &data;
} else if(s.st_shndx == rodatafar.number) {
sect = &rodatafar;
} else if(s.st_shndx == textfar.number) {
sect = &textfar;
} else {
PRINTF("elfloader unknown name: '%30s'\n", name);
memcpy(elfloader_unknown, name, sizeof(elfloader_unknown));
elfloader_unknown[sizeof(elfloader_unknown) - 1] = 0;
return ELFLOADER_SYMBOL_NOT_FOUND;
}
addr = sect->address;
}
} else {
if(s.st_shndx == bss.number) {
sect = &bss;
} else if(s.st_shndx == data.number) {
sect = &data;
} else if(s.st_shndx == rodatafar.number) {
sect = &rodatafar;
} else if(s.st_shndx == textfar.number) {
sect = &textfar;
} else {
return ELFLOADER_SEGMENT_NOT_FOUND;
}
addr = sect->address;
}
if(!using_relas) {
/* copy addend to rela structure */
seek_read(fd, sectionaddr + rela.r_offset, (char *)&rela.r_addend, 4);
}
elfloader_arch_relocate(fd, sectionaddr, sectionbase, &rela, addr);
}
return ELFLOADER_OK;
}
/*---------------------------------------------------------------------------*/
static void *
find_program_processes(int fd,
unsigned int symtab, unsigned short size,
unsigned int strtab)
{
struct elf32_sym s;
unsigned int a;
char name[30];
for(a = symtab; a < symtab + size; a += sizeof(s)) {
seek_read(fd, a, (char *)&s, sizeof(s));
if(s.st_name != 0) {
seek_read(fd, strtab + s.st_name, name, sizeof(name));
if(strcmp(name, "autostart_processes") == 0) {
return &data.address[s.st_value];
}
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
void
elfloader_init(void)
{
elfloader_autostart_processes = NULL;
}
/*---------------------------------------------------------------------------*/
int
elfloader_load(int fd)
{
struct elf32_ehdr ehdr;
struct elf32_shdr shdr;
struct elf32_shdr strtable;
unsigned int strs;
unsigned int shdrptr;
unsigned int nameptr;
char name[17];
int i;
unsigned short shdrnum, shdrsize;
unsigned char using_relas = -1;
unsigned short textoff = 0, textfaroff = 0, textsize, textfarsize,
textrelaoff = 0, textrelasize, textfarrelaoff = 0, textfarrelasize;
unsigned short dataoff = 0, datasize, datarelaoff = 0, datarelasize;
unsigned short rodataoff = 0, rodatafaroff = 0, rodatasize, rodatafarsize,
rodatarelaoff = 0, rodatarelasize, rodatafarrelaoff = 0,
rodatafarrelasize;
unsigned short symtaboff = 0, symtabsize;
unsigned short strtaboff = 0, strtabsize;
unsigned short bsssize = 0;
struct process **process;
int ret;
elfloader_unknown[0] = 0;
/* The ELF header is located at the start of the buffer. */
seek_read(fd, 0, (char *)&ehdr, sizeof(ehdr));
/* Make sure that we have a correct and compatible ELF header. */
if(memcmp(ehdr.e_ident, elf_magic_header, sizeof(elf_magic_header)) != 0) {
PRINTF("ELF header problems\n");
return ELFLOADER_BAD_ELF_HEADER;
}
/* Grab the section header. */
shdrptr = ehdr.e_shoff;
seek_read(fd, shdrptr, (char *)&shdr, sizeof(shdr));
/* Get the size and number of entries of the section header. */
shdrsize = ehdr.e_shentsize;
shdrnum = ehdr.e_shnum;
PRINTF("Section header: size %d num %d\n", shdrsize, shdrnum);
/* The string table section: holds the names of the sections. */
seek_read(fd, ehdr.e_shoff + shdrsize * ehdr.e_shstrndx,
(char *)&strtable, sizeof(strtable));
/*
* Get a pointer to the actual table of strings. This table holds
* the names of the sections, not the names of other symbols in the
* file (these are in the sybtam section).
*/
strs = strtable.sh_offset;
PRINTF("Strtable offset %d\n", strs);
/*
* Go through all sections and pick out the relevant ones. The
* ".text" and ".far.text" segments holds the actual code from
* the ELF file. The ".data" segment contains initialized data.
* The ".bss" segment holds the size of the unitialized data segment.
* The ".rodata" and ".far.rodata" segments contains constant data.
* The ".rela[a].text" and ".rela[a].far.text" segments contains
* relocation information for the contents of the ".text" and
* ".far.text" segments, respectively. The ".rela[a].rodata" and
* ".rela[a].far.rodata" segments contains relocation information
* for the contents of the ".rodata" and ".far.rodata" segments,
* respectively. The ".rela[a].data" segment contains relocation
* information for the contents of the ".data" segment. The ".symtab"
* segment contains the symbol table for this file. The ".strtab"
* segment points to the actual string names used by the symbol table.
*
* In addition to grabbing pointers to the relevant sections, we
* also save the section number for resolving addresses in the
* relocator code.
*/
/*
* Initialize the segment sizes to zero so that we can check if
* their sections was found in the file or not.
*/
textsize = textfarsize = textrelasize = textfarrelasize =
datasize = datarelasize = rodatasize = rodatafarsize =
rodatarelasize = rodatafarrelasize = symtabsize = strtabsize = 0;
bss.number = data.number = rodata.number = rodatafar.number =
text.number = textfar.number = -1;
shdrptr = ehdr.e_shoff;
for(i = 0; i < shdrnum; ++i) {
seek_read(fd, shdrptr, (char *)&shdr, sizeof(shdr));
/* The name of the section is contained in the strings table. */
nameptr = strs + shdr.sh_name;
seek_read(fd, nameptr, name, sizeof(name));
PRINTF("Section shdrptr 0x%x, %d + %d type %d\n",
shdrptr,
strs, shdr.sh_name,
(int)shdr.sh_type);
/*
* Match the name of the section with a predefined set of names
* (.text, .far.text, .data, .bss, .rodata, .far.rodata, .rela.text, .rela.far.text,
* .rela.data, .rela.rodata, .rela.far.rodata, .symtab, and .strtab).
*/
if(shdr.sh_type == SHT_SYMTAB) {
PRINTF("symtab\n");
symtaboff = shdr.sh_offset;
symtabsize = shdr.sh_size;
} else if(shdr.sh_type == SHT_STRTAB) {
PRINTF("strtab\n");
strtaboff = shdr.sh_offset;
strtabsize = shdr.sh_size;
} else if(strncmp(name, ".text", 5) == 0) {
textoff = shdr.sh_offset;
textsize = shdr.sh_size;
text.number = i;
text.offset = textoff;
} else if(strncmp(name, ".far.text", 9) == 0) {
textfaroff = shdr.sh_offset;
textfarsize = shdr.sh_size;
textfar.number = i;
textfar.offset = textfaroff;
} else if(strncmp(name, ".rel.text", 9) == 0) {
using_relas = 0;
textrelaoff = shdr.sh_offset;
textrelasize = shdr.sh_size;
} else if(strncmp(name, ".rela.text", 10) == 0) {
using_relas = 1;
textrelaoff = shdr.sh_offset;
textrelasize = shdr.sh_size;
} else if(strncmp(name, ".rela.far.text", 14) == 0) {
using_relas = 1;
textfarrelaoff = shdr.sh_offset;
textfarrelasize = shdr.sh_size;
} else if(strncmp(name, ".data", 5) == 0) {
dataoff = shdr.sh_offset;
datasize = shdr.sh_size;
data.number = i;
data.offset = dataoff;
} else if(strncmp(name, ".rodata", 7) == 0) {
/* read-only data handled the same way as regular text section */
rodataoff = shdr.sh_offset;
rodatasize = shdr.sh_size;
rodata.number = i;
rodata.offset = rodataoff;
} else if(strncmp(name, ".far.rodata", 11) == 0) {
rodatafaroff = shdr.sh_offset;
rodatafarsize = shdr.sh_size;
rodatafar.number = i;
rodatafar.offset = rodataoff;
} else if(strncmp(name, ".rel.rodata", 11) == 0) {
/* using elf32_rel instead of rela */
using_relas = 0;
rodatarelaoff = shdr.sh_offset;
rodatarelasize = shdr.sh_size;
} else if(strncmp(name, ".rela.rodata", 12) == 0) {
using_relas = 1;
rodatarelaoff = shdr.sh_offset;
rodatarelasize = shdr.sh_size;
} else if(strncmp(name, ".rela.far.rodata", 16) == 0) {
using_relas = 1;
rodatafarrelaoff = shdr.sh_offset;
rodatafarrelasize = shdr.sh_size;
} else if(strncmp(name, ".rel.data", 9) == 0) {
/* using elf32_rel instead of rela */
using_relas = 0;
datarelaoff = shdr.sh_offset;
datarelasize = shdr.sh_size;
} else if(strncmp(name, ".rela.data", 10) == 0) {
using_relas = 1;
datarelaoff = shdr.sh_offset;
datarelasize = shdr.sh_size;
} else if(strncmp(name, ".bss", 4) == 0) {
bsssize = shdr.sh_size;
bss.number = i;
bss.offset = 0;
}
/* Move on to the next section header. */
shdrptr += shdrsize;
}
if(symtabsize == 0) {
return ELFLOADER_NO_SYMTAB;
}
if(strtabsize == 0) {
return ELFLOADER_NO_STRTAB;
}
if(textfarsize == 0) {
return ELFLOADER_NO_TEXT;
}
PRINTF("before allocate ram\n");
bss.address = (char *)elfloader_arch_allocate_ram(bsssize + datasize);
data.address = (char *)bss.address + bsssize;
PRINTF("before allocate rom\n");
textfar.address = (char *)elfloader_arch_allocate_rom(textfarsize + rodatafarsize);
rodatafar.address = (char *)textfar.address + textfarsize;
PRINTF("bss base address: bss.address = 0x%08x\n", bss.address);
PRINTF("data base address: data.address = 0x%08x\n", data.address);
PRINTF("textfar base address: textfar.address = 0x%08x\n", textfar.address);
PRINTF("rodatafar base address: rodatafar.address = 0x%08x\n", rodatafar.address);
/* If we have text segment relocations, we process them. */
PRINTF("elfloader: relocate textfar\n");
if(textfarrelasize > 0) {
ret = relocate_section(fd,
textfarrelaoff, textfarrelasize,
textfaroff,
textfar.address,
strs,
strtaboff,
symtaboff, symtabsize, using_relas);
if(ret != ELFLOADER_OK) {
return ret;
}
}
/* If we have any rodata segment relocations, we process them too. */
PRINTF("elfloader: relocate rodata\n");
if(rodatafarrelasize > 0) {
ret = relocate_section(fd,
rodatafarrelaoff, rodatafarrelasize,
rodatafaroff,
rodatafar.address,
strs,
strtaboff,
symtaboff, symtabsize, using_relas);
if(ret != ELFLOADER_OK) {
PRINTF("elfloader: data failed\n");
return ret;
}
}
/* If we have any data segment relocations, we process them too. */
PRINTF("elfloader: relocate data\n");
if(datarelasize > 0) {
ret = relocate_section(fd,
datarelaoff, datarelasize,
dataoff,
data.address,
strs,
strtaboff,
symtaboff, symtabsize, using_relas);
if(ret != ELFLOADER_OK) {
PRINTF("elfloader: data failed\n");
return ret;
}
}
/* Write text and rodata segment into flash and data segment into RAM. */
elfloader_arch_write_rom(fd, textfaroff, textfarsize, textfar.address);
elfloader_arch_write_rom(fd, rodatafaroff, rodatafarsize, rodatafar.address);
memset(bss.address, 0, bsssize);
seek_read(fd, dataoff, data.address, datasize);
PRINTF("elfloader: autostart search\n");
process = (struct process **)find_local_symbol(fd, "autostart_processes",
symtaboff, symtabsize, strtaboff);
if(process != NULL) {
PRINTF("elfloader: autostart found\n");
elfloader_autostart_processes = process;
return ELFLOADER_OK;
} else {
PRINTF("elfloader: no autostart\n");
process = (struct process **)find_program_processes(fd, symtaboff,
symtabsize, strtaboff);
if(process != NULL) {
PRINTF("elfloader: FOUND PRG\n");
}
return ELFLOADER_NO_STARTPOINT;
}
}
/*---------------------------------------------------------------------------*/
void *
elfloader_arch_allocate_ram(int size)
{
return datamemory;
}
/*---------------------------------------------------------------------------*/
void *
elfloader_arch_allocate_rom(int size)
{
#if ELFLOADER_CONF_TEXT_IN_ROM
/* Return an 512-byte aligned pointer. */
return (char *)
((unsigned long)&textmemory[0] & 0xfffffe00) +
(((unsigned long)&textmemory[0] & 0x1ff) == 0 ? 0 : 0x200);
#else /* ELFLOADER_CONF_TEXT_IN_ROM */
return textmemory;
#endif /* ELFLOADER_CONF_TEXT_IN_ROM */
}
/*---------------------------------------------------------------------------*/
#define READSIZE 32
void
elfloader_arch_write_rom(int fd, unsigned short textoff, unsigned int size, char *mem)
{
#if ELFLOADER_CONF_TEXT_IN_ROM
int i;
unsigned int ptr;
unsigned short *flashptr;
flash_setup();
flashptr = (unsigned short *)mem;
cfs_seek(fd, textoff, CFS_SEEK_SET);
for(ptr = 0; ptr < size; ptr += READSIZE) {
/* Read data from file into RAM. */
cfs_read(fd, (unsigned char *)datamemory, READSIZE);
/* Clear flash page on 512 byte boundary. */
if((((unsigned short)flashptr) & 0x01ff) == 0) {
flash_clear(flashptr);
}
/*
* Burn data from RAM into flash ROM. Flash is burned one 16-bit
* word at a time, so we need to be careful when incrementing
* pointers. The flashptr is already a short pointer, so
* incrementing it by one will actually increment the address by
* two.
*/
for(i = 0; i < READSIZE / 2; ++i) {
flash_write(flashptr, ((unsigned short *)datamemory)[i]);
++flashptr;
}
}
flash_done();
#else /* ELFLOADER_CONF_TEXT_IN_ROM */
cfs_seek(fd, textoff, CFS_SEEK_SET);
cfs_read(fd, (unsigned char *)mem, size);
#endif /* ELFLOADER_CONF_TEXT_IN_ROM */
}
/*---------------------------------------------------------------------------*/
/* Relocate an MSP430X ELF section. */
void
elfloader_arch_relocate(int fd, unsigned int sectionoffset,
char *sectionaddr,
struct elf32_rela *rela, char *addr)
{
unsigned int type;
unsigned char instr[2];
type = ELF32_R_TYPE(rela->r_info);
addr += rela->r_addend;
switch(type) {
case R_MSP430_16:
case R_MSP430_16_PCREL:
case R_MSP430_16_BYTE:
case R_MSP430_16_PCREL_BYTE:
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_write(fd, (char *)&addr, 2);
break;
case R_MSP430_32:
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_write(fd, (char *)&addr, 2);
break;
case R_MSP430X_S:
case R_MSP430X_S_BYTE:
/* src(19:16) located at positions 11:8 of opcode */
/* src(15:0) located just after opcode */
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_read(fd, instr, 2);
instr[1] = (int)(instr[1]) & 0xf0 | (((long int)addr >> 8) & 0x0f00);
instr[0] = (int)(instr[0]) & 0xff;
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_write(fd, instr, 2);
cfs_write(fd, (char *)&addr, 2);
break;
case R_MSP430X_D:
case R_MSP430X_PCREL_D:
case R_MSP430X_D_BYTE:
/* dst(19:16) located at positions 3:0 of opcode */
/* dst(15:0) located just after opcode */
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_read(fd, instr, 2);
instr[1] = (int)(instr[1]) & 0xff;
instr[0] = (int)(instr[0]) & 0xf0 | (((long int)addr >> 16) & 0x000f);
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_write(fd, instr, 2);
cfs_write(fd, (char *)&addr, 2);
break;
case R_MSP430X_PCREL_SRC_BYTE:
case R_MSP430X_SRC_BYTE:
case R_MSP430X_PCREL_SRC:
case R_MSP430X_SRC:
/* src(19:16) located at positions 10:7 of extension word */
/* src(15:0) located just after opcode */
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_read(fd, instr, 2);
/* 4 most-significant bits */
instr[1] = (int)(instr[1]) & 0xf8 | (((long int)addr >> 9) & 0x0780);
instr[0] = (int)(instr[0]) & 0x7f | (((long int)addr >> 9) & 0x0780);
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_write(fd, instr, 2);
/* 16 least-significant bits */
cfs_seek(fd, sectionoffset + rela->r_offset + 0x04, CFS_SEEK_SET);
cfs_write(fd, (char *)&addr, 2);
break;
case R_MSP430X_DST_BYTE:
case R_MSP430X_PCREL_DST_BYTE:
case R_MSP430X_DST:
case R_MSP430X_PCREL_DST:
/* dst(19:16) located at positions 3:0 of extension word */
/* dst(15:0) located just after opcode */
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_read(fd, instr, 2);
instr[1] = (int)(instr[1]) & 0xff;
instr[0] = (int)(instr[0]) & 0xf0 | (((long int)addr >> 16) & 0x000f);
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_write(fd, instr, 2);
cfs_seek(fd, sectionoffset + rela->r_offset + 0x04, CFS_SEEK_SET);
cfs_write(fd, (char *)&addr, 2);
break;
case R_MSP430X_DST_2ND:
case R_MSP430X_PCREL_DST_2ND:
case R_MSP430X_DST_2ND_BYTE:
case R_MSP430X_PCREL_DST_2ND_BYTE:
/* dst(19:16) located at positions 3:0 of extension word */
/* dst(15:0) located after src(15:0) */
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_read(fd, instr, 2);
instr[1] = (int)(instr[1]) & 0xff;
instr[0] = (int)(instr[0]) & 0xf0 | (((long int)addr >> 16) & 0x000f);
cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET);
cfs_write(fd, instr, 2);
cfs_seek(fd, sectionoffset + rela->r_offset + 0x06, CFS_SEEK_SET);
cfs_write(fd, (char *)&addr, 2);
break;
case R_MSP430X_INDXD:
case R_MSP430X_PCREL_INDXD:
cfs_seek(fd, sectionoffset + rela->r_offset + 0x02, CFS_SEEK_SET);
cfs_write(fd, (char *)&addr, 2);
break;
default:
PRINTF("Unknown relocation type!\n");
break;
}
}
/*---------------------------------------------------------------------------*/
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