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Implement ELF file reading (finally). Requires libelf(3) to be 

present on the host system.



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1056 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
joerg_wunsch 2012-02-02 16:52:45 +00:00
parent ee3483eadf
commit f5e8183f30
8 changed files with 417 additions and 3 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
2012-02-02 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
Implement ELF file reading (finally). Requires libelf(3) to be
present on the host system.
* configure.ac (HAVE_LIBELF): Add logic to detect presence of
libelf(3)
* Makefile.am (avrdude_LDADD): Add @LIBELF@
* fileio.h (FILEFMT): add FMT_ELF
* fileio.c: Implement ELF file reader.
* update.c (parse_op): add 'e' format specifier
* avrdude.1: Document the ELF file reading capability
* doc/avrdude.texi: (Dito.)
2012-02-01 Rene Liebscher <R.Liebscher@gmx.de>
bug #30559 Ft232 bit-bang support

2
Makefile.am
View File

@ -61,7 +61,7 @@ avrdude_CFLAGS = @ENABLE_WARNINGS@
libavrdude_a_CFLAGS = @ENABLE_WARNINGS@
avrdude_LDADD = $(top_builddir)/$(noinst_LIBRARIES) @LIBUSB@ @LIBUSB_1_0@ @LIBFTDI@ @LIBHID@ -lm
avrdude_LDADD = $(top_builddir)/$(noinst_LIBRARIES) @LIBUSB@ @LIBUSB_1_0@ @LIBFTDI@ @LIBHID@ @LIBELF@ -lm
bin_PROGRAMS = avrdude

13
avrdude.1
View File

@ -19,7 +19,7 @@
.\"
.\" $Id$
.\"
.Dd DATE August 30, 2011
.Dd DATE February 2, 2012
.Os
.Dt AVRDUDE 1
.Sh NAME
@ -173,6 +173,14 @@ as a standalone assembler, or
.Xr avr-objcopy 1
for the final stage of the GNU toolchain for the AVR microcontroller.
.Pp
Provided
.Xr libelf 3
was present when compiling
.Nm avrdude ,
the input file can also be the final ELF file as produced by the linker.
The appropriate ELF section(s) will be examined, according to the memory
area to write to.
.Pp
.Nm Avrdude
can program the EEPROM and flash ROM memory cells of supported AVR
parts. Where supported by the serial instruction set, fuse bits and
@ -583,6 +591,8 @@ Intel Hex
Motorola S-record
.It Ar r
raw binary; little-endian byte order, in the case of the flash ROM data
.It Ar e
ELF (Executable and Linkable Format)
.It Ar m
immediate; actual byte values specified on the command line, separated
by commas or spaces. This is good for programming fuse bytes without
@ -984,6 +994,7 @@ normal ISP communication.
.Sh SEE ALSO
.Xr avr-objcopy 1 ,
.Xr ppi 4 ,
.Xr libelf 3,
.Xr readline 3
.Pp
The AVR microcontroller product description can be found at

14
configure.ac
View File

@ -74,6 +74,20 @@ AM_PROG_CC_C_O
AC_CHECK_LIB([termcap], [tputs])
AC_CHECK_LIB([ncurses], [tputs])
AC_CHECK_LIB([readline], [readline])
AH_TEMPLATE([HAVE_LIBELF],
[Define if ELF support is enabled via libelf])
AC_CHECK_LIB([elf], [elf_begin], [have_libelf=yes])
if test x$have_libelf = xyes; then
case $target in
*)
LIBELF="-lelf"
;;
esac
AC_DEFINE([HAVE_LIBELF])
AC_CHECK_HEADERS([libelf.h])
fi
AC_SUBST(LIBELF, $LIBELF)
AC_SEARCH_LIBS([gethostent], [nsl])
AC_SEARCH_LIBS([setsockopt], [socket])
AH_TEMPLATE([HAVE_LIBUSB],

4
doc/avrdude.texi
View File

@ -773,6 +773,10 @@ Motorola S-record
@itemx r
raw binary; little-endian byte order, in the case of the flash ROM data
@itemx e
ELF (Executable and Linkable Format), the final output file from the
linker; currently only accepted as an input file
@itemx m
immediate mode; actual byte values specified on the command line,
separated by commas or spaces in place of the @var{filename} field of

370
fileio.c
View File

@ -28,6 +28,11 @@
#include <errno.h>
#include <ctype.h>
#ifdef HAVE_LIBELF
#include <libelf.h>
#define EM_AVR32 0x18ad /* inofficial */
#endif
#include "avrdude.h"
#include "avr.h"
#include "fileio.h"
@ -74,6 +79,16 @@ static int fileio_ihex(struct fioparms * fio,
static int fileio_srec(struct fioparms * fio,
char * filename, FILE * f, AVRMEM * mem, int size);
#ifdef HAVE_LIBELF
static int elf2b(char * infile, FILE * inf,
AVRMEM * mem, struct avrpart * p,
int bufsize, unsigned int fileoffset);
static int fileio_elf(struct fioparms * fio,
char * filename, FILE * f, AVRMEM * mem,
struct avrpart * p, int size);
#endif
static int fileio_num(struct fioparms * fio,
char * filename, FILE * f, AVRMEM * mem, int size,
FILEFMT fmt);
@ -89,6 +104,7 @@ char * fmtstr(FILEFMT format)
case FMT_SREC : return "Motorola S-Record"; break;
case FMT_IHEX : return "Intel Hex"; break;
case FMT_RBIN : return "raw binary"; break;
case FMT_ELF : return "ELF"; break;
default : return "invalid format"; break;
};
}
@ -669,6 +685,307 @@ static int srec2b(char * infile, FILE * inf,
return maxaddr;
}
#ifdef HAVE_LIBELF
/*
* Return the ELF section descriptor that corresponds to program
* header `ph'. The program header is expected to be of p_type
* PT_LOAD, and to have a nonzero p_filesz. (PT_LOAD sections with a
* zero p_filesz are typically RAM sections that are not initialized
* by file data, e.g. ".bss".)
*/
static Elf_Scn *elf_get_scn(Elf *e, Elf32_Phdr *ph, Elf32_Shdr **shptr)
{
Elf_Scn *s = NULL;
while ((s = elf_nextscn(e, s)) != NULL) {
Elf32_Shdr *sh;
size_t ndx = elf_ndxscn(s);
if ((sh = elf32_getshdr(s)) == NULL) {
fprintf(stderr,
"%s: ERROR: Error reading section #%u header: %s\n",
progname, (unsigned int)ndx, elf_errmsg(-1));
continue;
}
if ((sh->sh_flags & SHF_ALLOC) == 0 ||
sh->sh_type != SHT_PROGBITS)
/* we are only interested in PROGBITS, ALLOC sections */
continue;
if (ph->p_vaddr == sh->sh_addr &&
ph->p_offset == sh->sh_offset) {
/* yeah, we found it */
*shptr = sh;
return s;
}
}
fprintf(stderr,
"%s: ERROR: Cannot find a matching section for "
"program header entry @p_vaddr 0x%x\n",
progname, ph->p_vaddr);
return NULL;
}
static int elf_mem_limits(AVRMEM *mem, struct avrpart * p,
unsigned int *lowbound,
unsigned int *highbound,
unsigned int *fileoff)
{
int rv = 0;
if (p->flags & AVRPART_AVR32) {
if (strcmp(mem->desc, "flash") == 0) {
*lowbound = 0x80000000;
*highbound = 0xffffffff;
*fileoff = 0;
} else {
rv = -1;
}
} else {
if (strcmp(mem->desc, "flash") == 0) {
*lowbound = 0;
*highbound = 0x7ffff; /* max 8 MiB */
*fileoff = 0;
} else if (strcmp(mem->desc, "eeprom") == 0) {
*lowbound = 0x810000;
*highbound = 0x81ffff; /* max 64 KiB */
*fileoff = 0;
} else if (strcmp(mem->desc, "lfuse") == 0) {
*lowbound = 0x820000;
*highbound = 0x82ffff;
*fileoff = 0;
} else if (strcmp(mem->desc, "hfuse") == 0) {
*lowbound = 0x820000;
*highbound = 0x82ffff;
*fileoff = 1;
} else if (strcmp(mem->desc, "efuse") == 0) {
*lowbound = 0x820000;
*highbound = 0x82ffff;
*fileoff = 2;
} else if (strncmp(mem->desc, "fuse", 4) == 0 &&
(mem->desc[4] >= '0' && mem->desc[4] <= '9')) {
/* Xmega fuseN */
*lowbound = 0x820000;
*highbound = 0x82ffff;
*fileoff = mem->desc[4] - '0';
} else if (strcmp(mem->desc, "lock") == 0) {
*lowbound = 0x830000;
*highbound = 0x83ffff;
*fileoff = 0;
} else {
rv = -1;
}
}
return rv;
}
static int elf2b(char * infile, FILE * inf,
AVRMEM * mem, struct avrpart * p,
int bufsize, unsigned int fileoffset)
{
Elf *e;
int rv = -1;
unsigned int low, high, foff;
if (elf_mem_limits(mem, p, &low, &high, &foff) != 0) {
fprintf(stderr,
"%s: ERROR: Cannot handle \"%s\" memory region from ELF file\n",
progname, mem->desc);
return -1;
}
if (elf_version(EV_CURRENT) == EV_NONE) {
fprintf(stderr,
"%s: ERROR: ELF library initialization failed: %s\n",
progname, elf_errmsg(-1));
return -1;
}
if ((e = elf_begin(fileno(inf), ELF_C_READ, NULL)) == NULL) {
fprintf(stderr,
"%s: ERROR: Cannot open \"%s\" as an ELF file: %s\n",
progname, infile, elf_errmsg(-1));
return -1;
}
if (elf_kind(e) != ELF_K_ELF) {
fprintf(stderr,
"%s: ERROR: Cannot use \"%s\" as an ELF input file\n",
progname, infile);
goto done;
}
size_t i, isize;
const char *id = elf_getident(e, &isize);
if (id == NULL) {
fprintf(stderr,
"%s: ERROR: Error reading ident area of \"%s\": %s\n",
progname, infile, elf_errmsg(-1));
goto done;
}
const char *endianname;
unsigned char endianess;
if (p->flags & AVRPART_AVR32) {
endianess = ELFDATA2MSB;
endianname = "little";
} else {
endianess = ELFDATA2LSB;
endianname = "big";
}
if (id[EI_CLASS] != ELFCLASS32 ||
id[EI_DATA] != endianess) {
fprintf(stderr,
"%s: ERROR: ELF file \"%s\" is not a "
"32-bit, %s-endian file that was expected\n",
progname, infile, endianname);
goto done;
}
Elf32_Ehdr *eh;
if ((eh = elf32_getehdr(e)) == NULL) {
fprintf(stderr,
"%s: ERROR: Error reading ehdr of \"%s\": %s\n",
progname, infile, elf_errmsg(-1));
goto done;
}
if (eh->e_type != ET_EXEC) {
fprintf(stderr,
"%s: ERROR: ELF file \"%s\" is not an executable file\n",
progname, infile);
goto done;
}
const char *mname;
uint16_t machine;
if (p->flags & AVRPART_AVR32) {
machine = EM_AVR32;
mname = "AVR32";
} else {
machine = EM_AVR;
mname = "AVR";
}
if (eh->e_machine != machine) {
fprintf(stderr,
"%s: ERROR: ELF file \"%s\" is not for machine %s\n",
progname, infile, mname);
goto done;
}
if (eh->e_phnum == 0xffff /* PN_XNUM */) {
fprintf(stderr,
"%s: ERROR: ELF file \"%s\" uses extended "
"program header numbers which are not expected\n",
progname, infile);
goto done;
}
Elf32_Phdr *ph;
if ((ph = elf32_getphdr(e)) == NULL) {
fprintf(stderr,
"%s: ERROR: Error reading program header table of \"%s\": %s\n",
progname, infile, elf_errmsg(-1));
goto done;
}
/*
* Walk the program header table, pick up entries that are of type
* PT_LOAD, and have a non-zero p_filesz.
*/
for (i = 0; i < eh->e_phnum; i++) {
if (ph[i].p_type != PT_LOAD ||
ph[i].p_filesz == 0)
continue;
if (verbose >= 2) {
fprintf(stderr,
"%s: Considering PT_LOAD program header entry #%d:\n"
" p_vaddr 0x%x, p_paddr 0x%x, p_filesz %d\n",
progname, i, ph[i].p_vaddr, ph[i].p_paddr, ph[i].p_filesz);
}
if (ph[i].p_paddr >= low &&
ph[i].p_paddr < high) {
/* OK */
} else {
if (verbose >= 2) {
fprintf(stderr,
" => skipping, inappropriate for \"%s\" memory region\n",
mem->desc);
}
continue;
}
/*
* 1-byte sized memory regions are special: they are used for fuse
* bits, where multiple regions (in the config file) map to a
* single, larger region in the ELF file (e.g. "lfuse", "hfuse",
* and "efuse" all map to ".fuse"). We silently accept a larger
* ELF file region for these, and extract the actual byte to write
* from it, using the "foff" offset obtained above.
*/
if (mem->size != 1 &&
ph[i].p_paddr + ph[i].p_filesz > mem->size) {
fprintf(stderr,
"%s: ERROR: program header entry #%d does not fit into \"%s\" memory:\n"
" 0x%x + %u > %u\n",
progname, i, mem->desc, ph[i].p_paddr, ph[i].p_filesz, mem->size);
continue;
}
Elf32_Shdr *sh;
Elf_Scn *s = elf_get_scn(e, ph + i, &sh);
if (s == NULL)
continue;
if ((sh->sh_flags & SHF_ALLOC) && sh->sh_size) {
Elf_Data *d = NULL;
while ((d = elf_getdata(s, d)) != NULL) {
if (verbose >= 2) {
fprintf(stderr,
" Data block: d_buf 0x%x, d_off 0x%x, d_size %d\n",
(unsigned int)d->d_buf, (unsigned int)d->d_off, d->d_size);
}
if (mem->size == 1) {
if (d->d_off != 0) {
fprintf(stderr,
"%s: ERROR: unexpected data block at offset != 0\n",
progname);
} else if (foff >= d->d_size) {
fprintf(stderr,
"%s: ERROR: ELF file section does not contain byte at offset %d\n",
progname, foff);
} else {
if (verbose >= 2) {
fprintf(stderr,
" Extracting one byte from file offset %d\n",
foff);
}
mem->buf[0] = ((unsigned char *)d->d_buf)[foff];
mem->tags[0] = TAG_ALLOCATED;
rv = 1;
}
} else {
unsigned int idx;
idx = ph[i].p_paddr - low + d->d_off;
if ((int)(idx + d->d_size) > rv)
rv = idx + d->d_size;
if (verbose >= 3) {
fprintf(stderr,
" Writing %d bytes to mem offset 0x%x\n",
d->d_size, idx);
}
memcpy(mem->buf + idx, d->d_buf, d->d_size);
memset(mem->tags + idx, TAG_ALLOCATED, d->d_size);
}
}
}
}
done:
(void)elf_end(e);
return rv;
}
#endif /* HAVE_LIBELF */
/*
* Simple itoa() implementation. Caller needs to allocate enough
* space in buf. Only positive integers are handled.
@ -851,6 +1168,36 @@ static int fileio_srec(struct fioparms * fio,
}
#ifdef HAVE_LIBELF
static int fileio_elf(struct fioparms * fio,
char * filename, FILE * f, AVRMEM * mem,
struct avrpart * p, int size)
{
int rc;
switch (fio->op) {
case FIO_WRITE:
fprintf(stderr, "%s: ERROR: write operation not (yet) "
"supported for ELF\n",
progname);
return -1;
break;
case FIO_READ:
rc = elf2b(filename, f, mem, p, size, fio->fileoffset);
return rc;
default:
fprintf(stderr, "%s: ERROR: invalid Motorola S-Records file I/O "
"operation=%d\n",
progname, fio->op);
return -1;
break;
}
}
#endif
static int fileio_num(struct fioparms * fio,
char * filename, FILE * f, AVRMEM * mem, int size,
FILEFMT fmt)
@ -975,6 +1322,7 @@ static int fmt_autodetect(char * fname)
int i;
int len;
int found;
int first = 1;
f = fopen(fname, "r");
if (f == NULL) {
@ -984,6 +1332,14 @@ static int fmt_autodetect(char * fname)
}
while (fgets((char *)buf, MAX_LINE_LEN, f)!=NULL) {
/* check for ELF file */
if (first &&
(buf[0] == 0177 && buf[1] == 'E' &&
buf[2] == 'L' && buf[3] == 'F')) {
fclose(f);
return FMT_ELF;
}
buf[MAX_LINE_LEN-1] = 0;
len = strlen((char *)buf);
if (buf[len-1] == '\n')
@ -1031,6 +1387,8 @@ static int fmt_autodetect(char * fname)
return FMT_SREC;
}
}
first = 0;
}
fclose(f);
@ -1150,6 +1508,18 @@ int fileio(int op, char * filename, FILEFMT format,
rc = fileio_rbin(&fio, fname, f, mem, size);
break;
case FMT_ELF:
#ifdef HAVE_LIBELF
rc = fileio_elf(&fio, fname, f, mem, p, size);
#else
fprintf(stderr,
"%s: can't handle ELF file %s, "
"ELF file support was not compiled in\n",
progname, fname);
rc = -1;
#endif
break;
case FMT_IMM:
rc = fileio_imm(&fio, fname, f, mem, size);
break;

3
fileio.h
View File

@ -31,7 +31,8 @@ typedef enum {
FMT_HEX,
FMT_DEC,
FMT_OCT,
FMT_BIN
FMT_BIN,
FMT_ELF
} FILEFMT;
struct fioparms {

1
update.c
View File

@ -138,6 +138,7 @@ UPDATE * parse_op(char * s)
case 's': upd->format = FMT_SREC; break;
case 'i': upd->format = FMT_IHEX; break;
case 'r': upd->format = FMT_RBIN; break;
case 'e': upd->format = FMT_ELF; break;
case 'm': upd->format = FMT_IMM; break;
case 'b': upd->format = FMT_BIN; break;
case 'd': upd->format = FMT_DEC; break;