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