1 /* load.c --- loading object files into the RX simulator.
3 Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Red Hat, Inc.
7 This file is part of the GNU simulators.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
32 #include "elf/internal.h"
33 #include "elf/common.h"
35 /* A note about endianness and swapping...
37 The RX chip is CISC-like in that the opcodes are variable length
38 and are read as a stream of bytes. However, the chip itself shares
39 the code prefetch block with the data fetch block, so when it's
40 configured for big endian mode, the memory fetched for opcodes is
41 word-swapped. To compensate for this, the ELF file has the code
42 sections pre-swapped. Our BFD knows this, and for the convenience
43 of all the other tools, hides this swapping at a very low level.
44 I.e. it swaps words on the way out and on the way back in.
46 Fortunately the iovector routines are unaffected by this, so we
47 can use them to read in the segments directly, without having
48 to worry about byte swapping anything.
50 However, our opcode decoder and disassemblers need to swap the data
51 after reading it from the chip memory, just like the chip does.
52 All in all, the code words are swapped four times between the
53 assembler and our decoder.
55 If the chip is running in little-endian mode, no swapping is done
56 anywhere. Note also that the *operands* within opcodes are always
57 encoded in little-endian format. */
62 unsigned long highest_addr_loaded = 0;
63 Elf_Internal_Phdr * phdrs;
68 rx_big_endian = bfd_big_endian (prog);
70 /* Note we load by ELF program header not by BFD sections.
71 This is because BFD sections get their information from
72 the ELF section structure, which only includes a VMA value
73 and not an LMA value. */
74 sizeof_phdrs = bfd_get_elf_phdr_upper_bound (prog);
75 if (sizeof_phdrs == 0)
77 fprintf (stderr, "Failed to get size of program headers\n");
80 phdrs = malloc (sizeof_phdrs);
83 fprintf (stderr, "Failed allocate memory to hold program headers\n");
86 num_headers = bfd_get_elf_phdrs (prog, phdrs);
89 fprintf (stderr, "Failed to read program headers\n");
93 for (i = 0; i < num_headers; i++)
95 Elf_Internal_Phdr * p = phdrs + i;
107 fprintf (stderr, "[load segment: lma=%08x vma=%08x size=%08x]\n",
108 (int) base, (int) p->p_vaddr, (int) size);
113 fprintf (stderr, "Failed to allocate buffer to hold program segment\n");
117 offset = p->p_offset;
118 if (prog->iovec->bseek (prog, offset, SEEK_SET) != 0)
120 fprintf (stderr, "Failed to seek to offset %lx\n", (long) offset);
123 if (prog->iovec->bread (prog, buf, size) != size)
125 fprintf (stderr, "Failed to read %lx bytes\n", size);
129 mem_put_blk (base, buf, size);
131 if (highest_addr_loaded < base + size - 1 && size >= 4)
132 highest_addr_loaded = base + size - 1;
137 regs.r_pc = prog->start_address;
139 if (strcmp (bfd_get_target (prog), "srec") == 0
142 regs.r_pc = mem_get_si (0xfffffffc);
143 heaptop = heapbottom = 0;
149 fprintf (stderr, "[start pc=%08x %s]\n",
150 (unsigned int) regs.r_pc,
151 rx_big_endian ? "BE" : "LE");