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/**
* @file libutil++/op_spu_bfd.cpp
* Encapsulation of bfd objects for Cell BE SPU
*
* @remark Copyright 2007 OProfile authors
* @remark Read the file COPYING
*
* @author Maynard Johnson
* (C) Copyright IBM Corporation 2007
*/
#include <fcntl.h>
#include <sys/stat.h>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <cstring>
#include <cstdlib>
#include "op_bfd.h"
#include "locate_images.h"
#include "op_libiberty.h"
#include "string_filter.h"
#include "cverb.h"
#define OP_SPU_DYN_FLAG 0x10000000 /* kernel module adds this offset */
/* to SPU code it can't find in the map */
#define OP_SPU_MEMSIZE 0x3ffff /* Physical memory size on an SPU */
using namespace std;
extern verbose vbfd;
/*
* This overload of the op_bfd constructor is patterned after the
* constructor in libutil++/op_bfd.cpp, with the additional processing
* needed to handle an embedded spu offset.
*/
op_bfd::op_bfd(uint64_t spu_offset, string const & fname,
string_filter const & symbol_filter,
extra_images const & extra_images, bool & ok)
:
archive_path(extra_images.get_archive_path()),
extra_found_images(extra_images),
file_size(-1),
embedding_filename(fname),
anon_obj(false)
{
int fd;
struct stat st;
int notes_remaining;
bool spu_note_found = false;
size_t sec_size = 0;
unsigned int oct_per_byte;
asection * note = NULL;
symbols_found_t symbols;
asection const * sect;
image_error image_ok;
string const image_path =
extra_images.find_image_path(fname, image_ok, true);
cverb << vbfd << "op_bfd ctor for " << image_path << endl;
if (!ok)
goto out_fail;
fd = open(image_path.c_str(), O_RDONLY);
if (fd == -1) {
cverb << vbfd << "open failed for " << image_path << endl;
ok = false;
goto out_fail;
}
if (fstat(fd, &st)) {
cverb << vbfd << "stat failed for " << image_path << endl;
ok = false;
goto out_fail;
}
file_size = st.st_size;
ibfd.abfd = spu_open_bfd(image_path, fd, spu_offset);
if (!ibfd.valid()) {
cverb << vbfd << "fdopen_bfd failed for " << image_path << endl;
ok = false;
goto out_fail;
}
/* For embedded SPU ELF, a note section named '.note.spu_name'
* contains the name of the SPU binary image in the description
* field.
*/
note = bfd_get_section_by_name(ibfd.abfd, ".note.spu_name");
if (!note) {
cverb << vbfd << "No .note.spu-name section found" << endl;
goto find_sec_code;
}
cverb << vbfd << "found .note.spu_name section" << endl;
bfd_byte * sec_contents;
oct_per_byte = bfd_octets_per_byte(ibfd.abfd);
sec_size = bfd_section_size(ibfd.abfd, note)/oct_per_byte;
sec_contents = (bfd_byte *) xmalloc(sec_size);
if (!bfd_get_section_contents(ibfd.abfd, note, sec_contents,
0, sec_size)) {
cverb << vbfd << "bfd_get_section_contents with size "
<< sec_size << " returned an error" << endl;
ok = false;
goto out_fail;
}
notes_remaining = sec_size;
while (notes_remaining && !spu_note_found) {
unsigned int nsize, dsize, type;
nsize = *((unsigned int *) sec_contents);
dsize = *((unsigned int *) sec_contents +1);
type = *((unsigned int *) sec_contents +2);
int remainder, desc_start, name_pad_length, desc_pad_length;
name_pad_length = desc_pad_length = 0;
/* Calculate padding for 4-byte alignment */
remainder = nsize % 4;
if (remainder != 0)
name_pad_length = 4 - remainder;
desc_start = 12 + nsize + name_pad_length;
if (type != 1) {
int note_record_length;
if ((remainder = (dsize % 4)) != 0)
desc_pad_length = 4 - remainder;
note_record_length = 12 + nsize +
name_pad_length + dsize + desc_pad_length;
notes_remaining -= note_record_length;
sec_contents += note_record_length;
continue;
} else {
spu_note_found = true;
/* Must memcpy the data from sec_contents to a
* 'char *' first, then stringify it, since
* the type of sec_contents (bfd_byte *) cannot be
* used as input for creating a string.
*/
char * description = (char *) xmalloc(dsize);
memcpy(description, sec_contents + desc_start, dsize);
filename = description;
free(description);
}
}
free(sec_contents);
/* Default to app name for the image name */
if (spu_note_found == false)
filename = fname;
find_sec_code:
for (sect = ibfd.abfd->sections; sect; sect = sect->next) {
if (sect->flags & SEC_CODE) {
if (filepos_map[sect->name] != 0) {
cerr << "Found section \"" << sect->name
<< "\" twice for " << get_filename()
<< endl;
abort();
}
filepos_map[sect->name] = sect->filepos;
}
}
get_symbols(symbols);
/* In some cases the SPU library code generates code stubs on the stack. */
/* The kernel module remaps those addresses so add an entry to catch/report them. */
symbols.push_back(op_bfd_symbol(OP_SPU_DYN_FLAG, OP_SPU_MEMSIZE,
"__send_to_ppe(stack)"));
out:
add_symbols(symbols, symbol_filter);
return;
out_fail:
ibfd.close();
dbfd.close();
file_size = -1;
goto out;
}
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