/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2013 David Chisnall
* All rights reserved.
*
* This software was developed by SRI International and the University of
* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
* ("CTSRD"), as part of the DARPA CRASH research programme.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include "dtb.hh"
#include <sys/types.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
using std::string;
namespace {
void write(dtc::byte_buffer &buffer, int fd)
{
size_t size = buffer.size();
uint8_t *data = buffer.data();
while (size > 0)
{
ssize_t r = ::write(fd, data, size);
if (r >= 0)
{
data += r;
size -= r;
}
else if (errno != EAGAIN)
{
fprintf(stderr, "Writing to file failed\n");
exit(-1);
}
}
}
}
namespace dtc
{
namespace dtb
{
void output_writer::write_data(byte_buffer b)
{
for (auto i : b)
{
write_data(i);
}
}
void
binary_writer::write_string(const string &name)
{
push_string(buffer, name);
// Trailing nul
buffer.push_back(0);
}
void
binary_writer::write_data(uint8_t v)
{
buffer.push_back(v);
}
void
binary_writer::write_data(uint32_t v)
{
while (buffer.size() % 4 != 0)
{
buffer.push_back(0);
}
push_big_endian(buffer, v);
}
void
binary_writer::write_data(uint64_t v)
{
while (buffer.size() % 8 != 0)
{
buffer.push_back(0);
}
push_big_endian(buffer, v);
}
void
binary_writer::write_to_file(int fd)
{
write(buffer, fd);
}
uint32_t
binary_writer::size()
{
return buffer.size();
}
void
asm_writer::write_line(const char *c)
{
if (byte_count != 0)
{
byte_count = 0;
buffer.push_back('\n');
}
write_string(c);
}
void
asm_writer::write_byte(uint8_t b)
{
char out[3] = {0};
if (byte_count++ == 0)
{
buffer.push_back('\t');
}
write_string(".byte 0x");
snprintf(out, 3, "%.2hhx", b);
buffer.push_back(out[0]);
buffer.push_back(out[1]);
if (byte_count == 4)
{
buffer.push_back('\n');
byte_count = 0;
}
else
{
buffer.push_back(';');
buffer.push_back(' ');
}
}
void
asm_writer::write_label(const string &name)
{
write_line("\t.globl ");
push_string(buffer, name);
buffer.push_back('\n');
push_string(buffer, name);
buffer.push_back(':');
buffer.push_back('\n');
buffer.push_back('_');
push_string(buffer, name);
buffer.push_back(':');
buffer.push_back('\n');
}
void
asm_writer::write_comment(const string &name)
{
write_line("\t/* ");
push_string(buffer, name);
write_string(" */\n");
}
void
asm_writer::write_string(const char *c)
{
while (*c)
{
buffer.push_back((uint8_t)*(c++));
}
}
void
asm_writer::write_string(const string &name)
{
write_line("\t.string \"");
push_string(buffer, name);
write_line("\"\n");
bytes_written += name.size() + 1;
}
void
asm_writer::write_data(uint8_t v)
{
write_byte(v);
bytes_written++;
}
void
asm_writer::write_data(uint32_t v)
{
if (bytes_written % 4 != 0)
{
write_line("\t.balign 4\n");
bytes_written += (4 - (bytes_written % 4));
}
write_byte((v >> 24) & 0xff);
write_byte((v >> 16) & 0xff);
write_byte((v >> 8) & 0xff);
write_byte((v >> 0) & 0xff);
bytes_written += 4;
}
void
asm_writer::write_data(uint64_t v)
{
if (bytes_written % 8 != 0)
{
write_line("\t.balign 8\n");
bytes_written += (8 - (bytes_written % 8));
}
write_byte((v >> 56) & 0xff);
write_byte((v >> 48) & 0xff);
write_byte((v >> 40) & 0xff);
write_byte((v >> 32) & 0xff);
write_byte((v >> 24) & 0xff);
write_byte((v >> 16) & 0xff);
write_byte((v >> 8) & 0xff);
write_byte((v >> 0) & 0xff);
bytes_written += 8;
}
void
asm_writer::write_to_file(int fd)
{
write(buffer, fd);
}
uint32_t
asm_writer::size()
{
return bytes_written;
}
void
header::write(output_writer &out)
{
out.write_label("dt_blob_start");
out.write_label("dt_header");
out.write_comment("magic");
out.write_data(magic);
out.write_comment("totalsize");
out.write_data(totalsize);
out.write_comment("off_dt_struct");
out.write_data(off_dt_struct);
out.write_comment("off_dt_strings");
out.write_data(off_dt_strings);
out.write_comment("off_mem_rsvmap");
out.write_data(off_mem_rsvmap);
out.write_comment("version");
out.write_data(version);
out.write_comment("last_comp_version");
out.write_data(last_comp_version);
out.write_comment("boot_cpuid_phys");
out.write_data(boot_cpuid_phys);
out.write_comment("size_dt_strings");
out.write_data(size_dt_strings);
out.write_comment("size_dt_struct");
out.write_data(size_dt_struct);
}
bool
header::read_dtb(input_buffer &input)
{
if (!input.consume_binary(magic))
{
fprintf(stderr, "Missing magic token in header.");
return false;
}
if (magic != 0xd00dfeed)
{
fprintf(stderr, "Bad magic token in header. Got %" PRIx32
" expected 0xd00dfeed\n", magic);
return false;
}
return input.consume_binary(totalsize) &&
input.consume_binary(off_dt_struct) &&
input.consume_binary(off_dt_strings) &&
input.consume_binary(off_mem_rsvmap) &&
input.consume_binary(version) &&
input.consume_binary(last_comp_version) &&
input.consume_binary(boot_cpuid_phys) &&
input.consume_binary(size_dt_strings) &&
input.consume_binary(size_dt_struct);
}
uint32_t
string_table::add_string(const string &str)
{
auto old = string_offsets.find(str);
if (old == string_offsets.end())
{
uint32_t start = size;
// Don't forget the trailing nul
size += str.size() + 1;
string_offsets.insert(std::make_pair(str, start));
strings.push_back(str);
return start;
}
else
{
return old->second;
}
}
void
string_table::write(dtb::output_writer &writer)
{
writer.write_comment("Strings table.");
writer.write_label("dt_strings_start");
for (auto &i : strings)
{
writer.write_string(i);
}
writer.write_label("dt_strings_end");
}
} // namespace dtb
} // namespace dtc
