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4f8d4a38 DD |
1 | /* load.c --- loading object files into the RX simulator. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2005-2014 Free Software Foundation, Inc. |
4f8d4a38 DD |
4 | Contributed by Red Hat, Inc. |
5 | ||
6 | This file is part of the GNU simulators. | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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/>. */ | |
20 | ||
21 | ||
8d794149 | 22 | #include "config.h" |
4f8d4a38 DD |
23 | #include <stdlib.h> |
24 | #include <stdio.h> | |
25 | #include <string.h> | |
26 | ||
27 | #include "bfd.h" | |
28 | #include "libbfd.h" | |
29 | #include "cpu.h" | |
30 | #include "mem.h" | |
d98bfeb0 | 31 | #include "load.h" |
4f8d4a38 DD |
32 | #include "elf/internal.h" |
33 | #include "elf/common.h" | |
34 | ||
d98bfeb0 KB |
35 | /* Helper function for invoking a GDB-specified printf. */ |
36 | static void | |
37 | xprintf (host_callback *callback, const char *fmt, ...) | |
38 | { | |
39 | va_list ap; | |
40 | ||
41 | va_start (ap, fmt); | |
42 | ||
43 | (*callback->vprintf_filtered) (callback, fmt, ap); | |
44 | ||
45 | va_end (ap); | |
46 | } | |
47 | ||
48 | /* Given a file offset, look up the section name. */ | |
49 | static const char * | |
50 | find_section_name_by_offset (bfd *abfd, file_ptr filepos) | |
51 | { | |
52 | asection *s; | |
53 | ||
54 | for (s = abfd->sections; s; s = s->next) | |
55 | if (s->filepos == filepos) | |
56 | return bfd_get_section_name (abfd, s); | |
57 | ||
58 | return "(unknown)"; | |
59 | } | |
60 | ||
4f8d4a38 DD |
61 | /* A note about endianness and swapping... |
62 | ||
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. | |
71 | ||
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. | |
75 | ||
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. | |
80 | ||
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. */ | |
84 | ||
85 | void | |
d98bfeb0 | 86 | rx_load (bfd *prog, host_callback *callback) |
4f8d4a38 DD |
87 | { |
88 | unsigned long highest_addr_loaded = 0; | |
89 | Elf_Internal_Phdr * phdrs; | |
90 | long sizeof_phdrs; | |
91 | int num_headers; | |
92 | int i; | |
93 | ||
94 | rx_big_endian = bfd_big_endian (prog); | |
95 | ||
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) | |
102 | { | |
103 | fprintf (stderr, "Failed to get size of program headers\n"); | |
104 | return; | |
105 | } | |
106 | phdrs = malloc (sizeof_phdrs); | |
107 | if (phdrs == NULL) | |
108 | { | |
109 | fprintf (stderr, "Failed allocate memory to hold program headers\n"); | |
110 | return; | |
111 | } | |
112 | num_headers = bfd_get_elf_phdrs (prog, phdrs); | |
113 | if (num_headers < 1) | |
114 | { | |
115 | fprintf (stderr, "Failed to read program headers\n"); | |
116 | return; | |
117 | } | |
118 | ||
119 | for (i = 0; i < num_headers; i++) | |
120 | { | |
121 | Elf_Internal_Phdr * p = phdrs + i; | |
122 | char *buf; | |
123 | bfd_vma size; | |
124 | bfd_vma base; | |
125 | file_ptr offset; | |
126 | ||
127 | size = p->p_filesz; | |
128 | if (size <= 0) | |
129 | continue; | |
130 | ||
131 | base = p->p_paddr; | |
132 | if (verbose > 1) | |
133 | fprintf (stderr, "[load segment: lma=%08x vma=%08x size=%08x]\n", | |
134 | (int) base, (int) p->p_vaddr, (int) size); | |
d98bfeb0 KB |
135 | if (callback) |
136 | xprintf (callback, | |
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); | |
4f8d4a38 DD |
140 | |
141 | buf = malloc (size); | |
142 | if (buf == NULL) | |
143 | { | |
144 | fprintf (stderr, "Failed to allocate buffer to hold program segment\n"); | |
145 | continue; | |
146 | } | |
147 | ||
148 | offset = p->p_offset; | |
149 | if (prog->iovec->bseek (prog, offset, SEEK_SET) != 0) | |
150 | { | |
151 | fprintf (stderr, "Failed to seek to offset %lx\n", (long) offset); | |
152 | continue; | |
153 | } | |
154 | if (prog->iovec->bread (prog, buf, size) != size) | |
155 | { | |
156 | fprintf (stderr, "Failed to read %lx bytes\n", size); | |
157 | continue; | |
158 | } | |
159 | ||
160 | mem_put_blk (base, buf, size); | |
161 | free (buf); | |
162 | if (highest_addr_loaded < base + size - 1 && size >= 4) | |
163 | highest_addr_loaded = base + size - 1; | |
164 | } | |
165 | ||
166 | free (phdrs); | |
167 | ||
168 | regs.r_pc = prog->start_address; | |
169 | ||
170 | if (strcmp (bfd_get_target (prog), "srec") == 0 | |
171 | || regs.r_pc == 0) | |
172 | { | |
173 | regs.r_pc = mem_get_si (0xfffffffc); | |
174 | heaptop = heapbottom = 0; | |
175 | } | |
176 | ||
be380a3e KB |
177 | reset_decoder (); |
178 | ||
4f8d4a38 DD |
179 | if (verbose > 1) |
180 | fprintf (stderr, "[start pc=%08x %s]\n", | |
181 | (unsigned int) regs.r_pc, | |
182 | rx_big_endian ? "BE" : "LE"); | |
183 | } |