1 /* load.c --- loading object files into the RX simulator.
3 Copyright (C) 2005-2022 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/>. */
21 /* This must come before any other includes. */
34 /* Helper function for invoking a GDB-specified printf. */
36 xprintf (host_callback
*callback
, const char *fmt
, ...)
42 (*callback
->vprintf_filtered
) (callback
, fmt
, ap
);
47 /* Given a file offset, look up the section name. */
49 find_section_name_by_offset (bfd
*abfd
, file_ptr filepos
)
53 for (s
= abfd
->sections
; s
; s
= s
->next
)
54 if (s
->filepos
== filepos
)
55 return bfd_section_name (s
);
60 /* A note about endianness and swapping...
62 The RX chip is CISC-like in that the opcodes are variable length
63 and are read as a stream of bytes. However, the chip itself shares
64 the code prefetch block with the data fetch block, so when it's
65 configured for big endian mode, the memory fetched for opcodes is
66 word-swapped. To compensate for this, the ELF file has the code
67 sections pre-swapped. Our BFD knows this, and for the convenience
68 of all the other tools, hides this swapping at a very low level.
69 I.e. it swaps words on the way out and on the way back in.
71 Fortunately the iovector routines are unaffected by this, so we
72 can use them to read in the segments directly, without having
73 to worry about byte swapping anything.
75 However, our opcode decoder and disassemblers need to swap the data
76 after reading it from the chip memory, just like the chip does.
77 All in all, the code words are swapped four times between the
78 assembler and our decoder.
80 If the chip is running in little-endian mode, no swapping is done
81 anywhere. Note also that the *operands* within opcodes are always
82 encoded in little-endian format. */
85 rx_load (bfd
*prog
, host_callback
*callback
)
87 unsigned long highest_addr_loaded
= 0;
88 Elf_Internal_Phdr
* phdrs
;
93 rx_big_endian
= bfd_big_endian (prog
);
95 /* Note we load by ELF program header not by BFD sections.
96 This is because BFD sections get their information from
97 the ELF section structure, which only includes a VMA value
98 and not an LMA value. */
99 sizeof_phdrs
= bfd_get_elf_phdr_upper_bound (prog
);
100 if (sizeof_phdrs
== 0)
102 fprintf (stderr
, "Failed to get size of program headers\n");
105 phdrs
= malloc (sizeof_phdrs
);
108 fprintf (stderr
, "Failed allocate memory to hold program headers\n");
111 num_headers
= bfd_get_elf_phdrs (prog
, phdrs
);
114 fprintf (stderr
, "Failed to read program headers\n");
118 for (i
= 0; i
< num_headers
; i
++)
120 Elf_Internal_Phdr
* p
= phdrs
+ i
;
133 "[load segment: lma=%08" PRIx64
" vma=%08" PRIx64
" "
134 "size=%08" PRIx64
"]\n",
135 (uint64_t) base
, (uint64_t) p
->p_vaddr
, (uint64_t) size
);
138 "Loading section %s, size %#" PRIx64
" lma %08" PRIx64
139 " vma %08" PRIx64
"\n",
140 find_section_name_by_offset (prog
, p
->p_offset
),
141 (uint64_t) size
, (uint64_t) base
, (uint64_t) p
->p_vaddr
);
146 fprintf (stderr
, "Failed to allocate buffer to hold program segment\n");
150 offset
= p
->p_offset
;
151 if (bfd_seek (prog
, offset
, SEEK_SET
) != 0)
153 fprintf (stderr
, "Failed to seek to offset %lx\n", (long) offset
);
156 if (bfd_bread (buf
, size
, prog
) != size
)
158 fprintf (stderr
, "Failed to read %" PRIx64
" bytes\n",
163 mem_put_blk (base
, buf
, size
);
165 if (highest_addr_loaded
< base
+ size
- 1 && size
>= 4)
166 highest_addr_loaded
= base
+ size
- 1;
171 regs
.r_pc
= prog
->start_address
;
173 if (strcmp (bfd_get_target (prog
), "srec") == 0
176 regs
.r_pc
= mem_get_si (0xfffffffc);
177 heaptop
= heapbottom
= 0;
183 fprintf (stderr
, "[start pc=%08x %s]\n",
184 (unsigned int) regs
.r_pc
,
185 rx_big_endian
? "BE" : "LE");