mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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313 lines
6.7 KiB
C++
313 lines
6.7 KiB
C++
/*-
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* Copyright (c) 2013 David Chisnall
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "dtb.hh"
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#include <sys/types.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <unistd.h>
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namespace dtc
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{
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namespace dtb
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{
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void output_writer::write_data(byte_buffer b)
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{
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for (byte_buffer::iterator i=b.begin(), e=b.end(); i!=e ; i++)
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{
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write_data(*i);
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}
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}
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void
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binary_writer::write_string(string name)
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{
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name.push_to_buffer(buffer);
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// Trailing nul
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buffer.push_back(0);
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}
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void
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binary_writer::write_data(uint8_t v)
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{
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buffer.push_back(v);
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}
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void
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binary_writer::write_data(uint32_t v)
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{
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while (buffer.size() % 4 != 0)
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{
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buffer.push_back(0);
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}
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push_big_endian(buffer, v);
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}
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void
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binary_writer::write_data(uint64_t v)
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{
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while (buffer.size() % 8 != 0)
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{
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buffer.push_back(0);
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}
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push_big_endian(buffer, v);
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}
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void
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binary_writer::write_to_file(int fd)
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{
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// FIXME: Check return
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write(fd, buffer.data(), buffer.size());
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}
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uint32_t
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binary_writer::size()
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{
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return buffer.size();
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}
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void
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asm_writer::write_string(const char *c)
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{
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while (*c)
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{
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buffer.push_back((uint8_t)*(c++));
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}
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}
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void
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asm_writer::write_line(const char *c)
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{
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if (byte_count != 0)
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{
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byte_count = 0;
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buffer.push_back('\n');
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}
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write_string(c);
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}
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void
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asm_writer::write_byte(uint8_t b)
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{
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char out[3] = {0};
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if (byte_count++ == 0)
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{
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buffer.push_back('\t');
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}
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write_string(".byte 0x");
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snprintf(out, 3, "%.2hhx", b);
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buffer.push_back(out[0]);
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buffer.push_back(out[1]);
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if (byte_count == 4)
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{
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buffer.push_back('\n');
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byte_count = 0;
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}
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else
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{
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buffer.push_back(';');
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buffer.push_back(' ');
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}
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}
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void
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asm_writer::write_label(string name)
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{
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write_line("\t.globl ");
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name.push_to_buffer(buffer);
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buffer.push_back('\n');
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name.push_to_buffer(buffer);
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buffer.push_back(':');
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buffer.push_back('\n');
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buffer.push_back('_');
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name.push_to_buffer(buffer);
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buffer.push_back(':');
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buffer.push_back('\n');
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}
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void
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asm_writer::write_comment(string name)
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{
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write_line("\t/* ");
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name.push_to_buffer(buffer);
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write_string(" */\n");
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}
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void
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asm_writer::write_string(string name)
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{
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write_line("\t.string \"");
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name.push_to_buffer(buffer);
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write_line("\"\n");
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bytes_written += name.size() + 1;
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}
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void
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asm_writer::write_data(uint8_t v)
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{
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write_byte(v);
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bytes_written++;
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}
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void
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asm_writer::write_data(uint32_t v)
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{
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if (bytes_written % 4 != 0)
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{
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write_line("\t.balign 4\n");
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bytes_written += (4 - (bytes_written % 4));
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}
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write_byte((v >> 24) & 0xff);
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write_byte((v >> 16) & 0xff);
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write_byte((v >> 8) & 0xff);
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write_byte((v >> 0) & 0xff);
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bytes_written += 4;
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}
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void
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asm_writer::write_data(uint64_t v)
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{
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if (bytes_written % 8 != 0)
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{
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write_line("\t.balign 8\n");
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bytes_written += (8 - (bytes_written % 8));
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}
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write_byte((v >> 56) & 0xff);
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write_byte((v >> 48) & 0xff);
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write_byte((v >> 40) & 0xff);
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write_byte((v >> 32) & 0xff);
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write_byte((v >> 24) & 0xff);
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write_byte((v >> 16) & 0xff);
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write_byte((v >> 8) & 0xff);
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write_byte((v >> 0) & 0xff);
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bytes_written += 8;
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}
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void
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asm_writer::write_to_file(int fd)
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{
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// FIXME: Check return
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write(fd, buffer.data(), buffer.size());
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}
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uint32_t
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asm_writer::size()
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{
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return bytes_written;
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}
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void
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header::write(output_writer &out)
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{
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out.write_label(string("dt_blob_start"));
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out.write_label(string("dt_header"));
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out.write_comment("magic");
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out.write_data(magic);
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out.write_comment("totalsize");
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out.write_data(totalsize);
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out.write_comment("off_dt_struct");
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out.write_data(off_dt_struct);
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out.write_comment("off_dt_strings");
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out.write_data(off_dt_strings);
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out.write_comment("off_mem_rsvmap");
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out.write_data(off_mem_rsvmap);
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out.write_comment("version");
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out.write_data(version);
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out.write_comment("last_comp_version");
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out.write_data(last_comp_version);
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out.write_comment("boot_cpuid_phys");
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out.write_data(boot_cpuid_phys);
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out.write_comment("size_dt_strings");
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out.write_data(size_dt_strings);
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out.write_comment("size_dt_struct");
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out.write_data(size_dt_struct);
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}
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bool
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header::read_dtb(input_buffer &input)
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{
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if (!(input.consume_binary(magic) && magic == 0xd00dfeed))
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{
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fprintf(stderr, "Missing magic token in header. Got %" PRIx32
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" expected 0xd00dfeed\n", magic);
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return false;
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}
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return input.consume_binary(totalsize) &&
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input.consume_binary(off_dt_struct) &&
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input.consume_binary(off_dt_strings) &&
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input.consume_binary(off_mem_rsvmap) &&
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input.consume_binary(version) &&
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input.consume_binary(last_comp_version) &&
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input.consume_binary(boot_cpuid_phys) &&
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input.consume_binary(size_dt_strings) &&
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input.consume_binary(size_dt_struct);
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}
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uint32_t
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string_table::add_string(string str)
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{
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std::map<string, uint32_t>::iterator old = string_offsets.find(str);
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if (old == string_offsets.end())
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{
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uint32_t start = size;
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// Don't forget the trailing nul
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size += str.size() + 1;
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string_offsets.insert(std::make_pair(str, start));
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strings.push_back(str);
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return start;
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}
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else
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{
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return old->second;
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}
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}
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void
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string_table::write(dtb::output_writer &writer)
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{
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writer.write_comment(string("Strings table."));
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writer.write_label(string("dt_strings_start"));
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for (std::vector<string>::iterator i=strings.begin(), e=strings.end() ;
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i!=e ; ++i)
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{
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writer.write_string(*i);
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}
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writer.write_label(string("dt_strings_end"));
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}
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} // namespace dtb
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} // namespace dtc
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