/* load.c --- loading object files into the RX simulator.
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/* load.c --- loading object files into the RX simulator.
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Copyright (C) 2005, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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Copyright (C) 2005, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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Contributed by Red Hat, Inc.
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Contributed by Red Hat, Inc.
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This file is part of the GNU simulators.
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This file is part of the GNU simulators.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <string.h>
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#include <string.h>
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#include "bfd.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "libbfd.h"
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#include "cpu.h"
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#include "cpu.h"
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#include "mem.h"
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#include "mem.h"
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#include "elf/internal.h"
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#include "elf/internal.h"
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#include "elf/common.h"
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#include "elf/common.h"
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/* A note about endianness and swapping...
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/* A note about endianness and swapping...
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The RX chip is CISC-like in that the opcodes are variable length
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The RX chip is CISC-like in that the opcodes are variable length
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and are read as a stream of bytes. However, the chip itself shares
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and are read as a stream of bytes. However, the chip itself shares
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the code prefetch block with the data fetch block, so when it's
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the code prefetch block with the data fetch block, so when it's
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configured for big endian mode, the memory fetched for opcodes is
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configured for big endian mode, the memory fetched for opcodes is
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word-swapped. To compensate for this, the ELF file has the code
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word-swapped. To compensate for this, the ELF file has the code
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sections pre-swapped. Our BFD knows this, and for the convenience
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sections pre-swapped. Our BFD knows this, and for the convenience
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of all the other tools, hides this swapping at a very low level.
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of all the other tools, hides this swapping at a very low level.
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I.e. it swaps words on the way out and on the way back in.
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I.e. it swaps words on the way out and on the way back in.
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Fortunately the iovector routines are unaffected by this, so we
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Fortunately the iovector routines are unaffected by this, so we
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can use them to read in the segments directly, without having
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can use them to read in the segments directly, without having
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to worry about byte swapping anything.
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to worry about byte swapping anything.
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However, our opcode decoder and disassemblers need to swap the data
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However, our opcode decoder and disassemblers need to swap the data
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after reading it from the chip memory, just like the chip does.
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after reading it from the chip memory, just like the chip does.
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All in all, the code words are swapped four times between the
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All in all, the code words are swapped four times between the
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assembler and our decoder.
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assembler and our decoder.
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If the chip is running in little-endian mode, no swapping is done
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If the chip is running in little-endian mode, no swapping is done
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anywhere. Note also that the *operands* within opcodes are always
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anywhere. Note also that the *operands* within opcodes are always
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encoded in little-endian format. */
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encoded in little-endian format. */
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void
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void
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rx_load (bfd *prog)
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rx_load (bfd *prog)
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{
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{
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unsigned long highest_addr_loaded = 0;
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unsigned long highest_addr_loaded = 0;
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Elf_Internal_Phdr * phdrs;
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Elf_Internal_Phdr * phdrs;
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long sizeof_phdrs;
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long sizeof_phdrs;
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int num_headers;
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int num_headers;
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int i;
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int i;
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rx_big_endian = bfd_big_endian (prog);
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rx_big_endian = bfd_big_endian (prog);
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/* Note we load by ELF program header not by BFD sections.
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/* Note we load by ELF program header not by BFD sections.
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This is because BFD sections get their information from
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This is because BFD sections get their information from
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the ELF section structure, which only includes a VMA value
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the ELF section structure, which only includes a VMA value
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and not an LMA value. */
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and not an LMA value. */
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sizeof_phdrs = bfd_get_elf_phdr_upper_bound (prog);
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sizeof_phdrs = bfd_get_elf_phdr_upper_bound (prog);
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if (sizeof_phdrs == 0)
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if (sizeof_phdrs == 0)
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{
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{
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fprintf (stderr, "Failed to get size of program headers\n");
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fprintf (stderr, "Failed to get size of program headers\n");
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return;
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return;
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}
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}
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phdrs = malloc (sizeof_phdrs);
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phdrs = malloc (sizeof_phdrs);
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if (phdrs == NULL)
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if (phdrs == NULL)
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{
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{
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fprintf (stderr, "Failed allocate memory to hold program headers\n");
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fprintf (stderr, "Failed allocate memory to hold program headers\n");
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return;
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return;
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}
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}
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num_headers = bfd_get_elf_phdrs (prog, phdrs);
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num_headers = bfd_get_elf_phdrs (prog, phdrs);
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if (num_headers < 1)
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if (num_headers < 1)
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{
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{
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fprintf (stderr, "Failed to read program headers\n");
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fprintf (stderr, "Failed to read program headers\n");
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return;
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return;
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}
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}
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for (i = 0; i < num_headers; i++)
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for (i = 0; i < num_headers; i++)
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{
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{
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Elf_Internal_Phdr * p = phdrs + i;
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Elf_Internal_Phdr * p = phdrs + i;
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char *buf;
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char *buf;
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bfd_vma size;
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bfd_vma size;
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bfd_vma base;
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bfd_vma base;
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file_ptr offset;
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file_ptr offset;
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size = p->p_filesz;
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size = p->p_filesz;
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if (size <= 0)
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if (size <= 0)
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continue;
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continue;
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base = p->p_paddr;
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base = p->p_paddr;
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if (verbose > 1)
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if (verbose > 1)
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fprintf (stderr, "[load segment: lma=%08x vma=%08x size=%08x]\n",
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fprintf (stderr, "[load segment: lma=%08x vma=%08x size=%08x]\n",
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(int) base, (int) p->p_vaddr, (int) size);
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(int) base, (int) p->p_vaddr, (int) size);
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buf = malloc (size);
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buf = malloc (size);
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if (buf == NULL)
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if (buf == NULL)
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{
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{
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fprintf (stderr, "Failed to allocate buffer to hold program segment\n");
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fprintf (stderr, "Failed to allocate buffer to hold program segment\n");
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continue;
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continue;
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}
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}
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offset = p->p_offset;
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offset = p->p_offset;
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if (prog->iovec->bseek (prog, offset, SEEK_SET) != 0)
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if (prog->iovec->bseek (prog, offset, SEEK_SET) != 0)
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{
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{
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fprintf (stderr, "Failed to seek to offset %lx\n", (long) offset);
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fprintf (stderr, "Failed to seek to offset %lx\n", (long) offset);
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continue;
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continue;
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}
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}
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if (prog->iovec->bread (prog, buf, size) != size)
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if (prog->iovec->bread (prog, buf, size) != size)
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{
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{
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fprintf (stderr, "Failed to read %lx bytes\n", size);
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fprintf (stderr, "Failed to read %lx bytes\n", size);
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continue;
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continue;
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}
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}
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mem_put_blk (base, buf, size);
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mem_put_blk (base, buf, size);
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free (buf);
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free (buf);
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if (highest_addr_loaded < base + size - 1 && size >= 4)
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if (highest_addr_loaded < base + size - 1 && size >= 4)
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highest_addr_loaded = base + size - 1;
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highest_addr_loaded = base + size - 1;
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}
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}
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free (phdrs);
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free (phdrs);
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regs.r_pc = prog->start_address;
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regs.r_pc = prog->start_address;
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if (strcmp (bfd_get_target (prog), "srec") == 0
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if (strcmp (bfd_get_target (prog), "srec") == 0
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|| regs.r_pc == 0)
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|| regs.r_pc == 0)
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{
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{
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regs.r_pc = mem_get_si (0xfffffffc);
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regs.r_pc = mem_get_si (0xfffffffc);
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heaptop = heapbottom = 0;
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heaptop = heapbottom = 0;
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}
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}
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if (verbose > 1)
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if (verbose > 1)
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fprintf (stderr, "[start pc=%08x %s]\n",
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fprintf (stderr, "[start pc=%08x %s]\n",
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(unsigned int) regs.r_pc,
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(unsigned int) regs.r_pc,
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rx_big_endian ? "BE" : "LE");
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rx_big_endian ? "BE" : "LE");
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}
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}
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