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4f8d4a38 DD |
1 | /* load.c --- loading object files into the RX simulator. |
2 | ||
dc3cf14f | 3 | Copyright (C) 2005, 2007, 2008, 2009, 2010 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" | |
31 | #include "elf/internal.h" | |
32 | #include "elf/common.h" | |
33 | ||
34 | /* A note about endianness and swapping... | |
35 | ||
36 | The RX chip is CISC-like in that the opcodes are variable length | |
37 | and are read as a stream of bytes. However, the chip itself shares | |
38 | the code prefetch block with the data fetch block, so when it's | |
39 | configured for big endian mode, the memory fetched for opcodes is | |
40 | word-swapped. To compensate for this, the ELF file has the code | |
41 | sections pre-swapped. Our BFD knows this, and for the convenience | |
42 | of all the other tools, hides this swapping at a very low level. | |
43 | I.e. it swaps words on the way out and on the way back in. | |
44 | ||
45 | Fortunately the iovector routines are unaffected by this, so we | |
46 | can use them to read in the segments directly, without having | |
47 | to worry about byte swapping anything. | |
48 | ||
49 | However, our opcode decoder and disassemblers need to swap the data | |
50 | after reading it from the chip memory, just like the chip does. | |
51 | All in all, the code words are swapped four times between the | |
52 | assembler and our decoder. | |
53 | ||
54 | If the chip is running in little-endian mode, no swapping is done | |
55 | anywhere. Note also that the *operands* within opcodes are always | |
56 | encoded in little-endian format. */ | |
57 | ||
58 | void | |
59 | rx_load (bfd *prog) | |
60 | { | |
61 | unsigned long highest_addr_loaded = 0; | |
62 | Elf_Internal_Phdr * phdrs; | |
63 | long sizeof_phdrs; | |
64 | int num_headers; | |
65 | int i; | |
66 | ||
67 | rx_big_endian = bfd_big_endian (prog); | |
68 | ||
69 | /* Note we load by ELF program header not by BFD sections. | |
70 | This is because BFD sections get their information from | |
71 | the ELF section structure, which only includes a VMA value | |
72 | and not an LMA value. */ | |
73 | sizeof_phdrs = bfd_get_elf_phdr_upper_bound (prog); | |
74 | if (sizeof_phdrs == 0) | |
75 | { | |
76 | fprintf (stderr, "Failed to get size of program headers\n"); | |
77 | return; | |
78 | } | |
79 | phdrs = malloc (sizeof_phdrs); | |
80 | if (phdrs == NULL) | |
81 | { | |
82 | fprintf (stderr, "Failed allocate memory to hold program headers\n"); | |
83 | return; | |
84 | } | |
85 | num_headers = bfd_get_elf_phdrs (prog, phdrs); | |
86 | if (num_headers < 1) | |
87 | { | |
88 | fprintf (stderr, "Failed to read program headers\n"); | |
89 | return; | |
90 | } | |
91 | ||
92 | for (i = 0; i < num_headers; i++) | |
93 | { | |
94 | Elf_Internal_Phdr * p = phdrs + i; | |
95 | char *buf; | |
96 | bfd_vma size; | |
97 | bfd_vma base; | |
98 | file_ptr offset; | |
99 | ||
100 | size = p->p_filesz; | |
101 | if (size <= 0) | |
102 | continue; | |
103 | ||
104 | base = p->p_paddr; | |
105 | if (verbose > 1) | |
106 | fprintf (stderr, "[load segment: lma=%08x vma=%08x size=%08x]\n", | |
107 | (int) base, (int) p->p_vaddr, (int) size); | |
108 | ||
109 | buf = malloc (size); | |
110 | if (buf == NULL) | |
111 | { | |
112 | fprintf (stderr, "Failed to allocate buffer to hold program segment\n"); | |
113 | continue; | |
114 | } | |
115 | ||
116 | offset = p->p_offset; | |
117 | if (prog->iovec->bseek (prog, offset, SEEK_SET) != 0) | |
118 | { | |
119 | fprintf (stderr, "Failed to seek to offset %lx\n", (long) offset); | |
120 | continue; | |
121 | } | |
122 | if (prog->iovec->bread (prog, buf, size) != size) | |
123 | { | |
124 | fprintf (stderr, "Failed to read %lx bytes\n", size); | |
125 | continue; | |
126 | } | |
127 | ||
128 | mem_put_blk (base, buf, size); | |
129 | free (buf); | |
130 | if (highest_addr_loaded < base + size - 1 && size >= 4) | |
131 | highest_addr_loaded = base + size - 1; | |
132 | } | |
133 | ||
134 | free (phdrs); | |
135 | ||
136 | regs.r_pc = prog->start_address; | |
137 | ||
138 | if (strcmp (bfd_get_target (prog), "srec") == 0 | |
139 | || regs.r_pc == 0) | |
140 | { | |
141 | regs.r_pc = mem_get_si (0xfffffffc); | |
142 | heaptop = heapbottom = 0; | |
143 | } | |
144 | ||
145 | if (verbose > 1) | |
146 | fprintf (stderr, "[start pc=%08x %s]\n", | |
147 | (unsigned int) regs.r_pc, | |
148 | rx_big_endian ? "BE" : "LE"); | |
149 | } |