f88feb698f537cdb8fc5da838225a60ef58f7495
1 /* load.c --- loading object files into the RX simulator.
3 Copyright (C) 2005-2016 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/>. */
32 #include "elf/internal.h"
33 #include "elf/common.h"
35 /* Helper function for invoking a GDB-specified printf. */
37 xprintf (host_callback
*callback
, const char *fmt
, ...)
43 (*callback
->vprintf_filtered
) (callback
, fmt
, ap
);
48 /* Given a file offset, look up the section name. */
50 find_section_name_by_offset (bfd
*abfd
, file_ptr filepos
)
54 for (s
= abfd
->sections
; s
; s
= s
->next
)
55 if (s
->filepos
== filepos
)
56 return bfd_get_section_name (abfd
, s
);
61 /* A note about endianness and swapping...
63 The RX chip is CISC-like in that the opcodes are variable length
64 and are read as a stream of bytes. However, the chip itself shares
65 the code prefetch block with the data fetch block, so when it's
66 configured for big endian mode, the memory fetched for opcodes is
67 word-swapped. To compensate for this, the ELF file has the code
68 sections pre-swapped. Our BFD knows this, and for the convenience
69 of all the other tools, hides this swapping at a very low level.
70 I.e. it swaps words on the way out and on the way back in.
72 Fortunately the iovector routines are unaffected by this, so we
73 can use them to read in the segments directly, without having
74 to worry about byte swapping anything.
76 However, our opcode decoder and disassemblers need to swap the data
77 after reading it from the chip memory, just like the chip does.
78 All in all, the code words are swapped four times between the
79 assembler and our decoder.
81 If the chip is running in little-endian mode, no swapping is done
82 anywhere. Note also that the *operands* within opcodes are always
83 encoded in little-endian format. */
86 rx_load (bfd
*prog
, host_callback
*callback
)
88 unsigned long highest_addr_loaded
= 0;
89 Elf_Internal_Phdr
* phdrs
;
94 rx_big_endian
= bfd_big_endian (prog
);
96 /* Note we load by ELF program header not by BFD sections.
97 This is because BFD sections get their information from
98 the ELF section structure, which only includes a VMA value
99 and not an LMA value. */
100 sizeof_phdrs
= bfd_get_elf_phdr_upper_bound (prog
);
101 if (sizeof_phdrs
== 0)
103 fprintf (stderr
, "Failed to get size of program headers\n");
106 phdrs
= malloc (sizeof_phdrs
);
109 fprintf (stderr
, "Failed allocate memory to hold program headers\n");
112 num_headers
= bfd_get_elf_phdrs (prog
, phdrs
);
115 fprintf (stderr
, "Failed to read program headers\n");
119 for (i
= 0; i
< num_headers
; i
++)
121 Elf_Internal_Phdr
* p
= phdrs
+ i
;
133 fprintf (stderr
, "[load segment: lma=%08x vma=%08x size=%08x]\n",
134 (int) base
, (int) p
->p_vaddr
, (int) size
);
137 "Loading section %s, size %#lx lma %08lx vma %08lx\n",
138 find_section_name_by_offset (prog
, p
->p_offset
),
139 size
, base
, p
->p_vaddr
);
144 fprintf (stderr
, "Failed to allocate buffer to hold program segment\n");
148 offset
= p
->p_offset
;
149 if (prog
->iovec
->bseek (prog
, offset
, SEEK_SET
) != 0)
151 fprintf (stderr
, "Failed to seek to offset %lx\n", (long) offset
);
154 if (prog
->iovec
->bread (prog
, buf
, size
) != size
)
156 fprintf (stderr
, "Failed to read %lx bytes\n", size
);
160 mem_put_blk (base
, buf
, size
);
162 if (highest_addr_loaded
< base
+ size
- 1 && size
>= 4)
163 highest_addr_loaded
= base
+ size
- 1;
168 regs
.r_pc
= prog
->start_address
;
170 if (strcmp (bfd_get_target (prog
), "srec") == 0
173 regs
.r_pc
= mem_get_si (0xfffffffc);
174 heaptop
= heapbottom
= 0;
180 fprintf (stderr
, "[start pc=%08x %s]\n",
181 (unsigned int) regs
.r_pc
,
182 rx_big_endian
? "BE" : "LE");
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