| 1 | /* load.c --- loading object files into the RX simulator. |
| 2 | |
| 3 | Copyright (C) 2005-2014 Free Software Foundation, Inc. |
| 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 | |
| 22 | #include "config.h" |
| 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 "load.h" |
| 32 | #include "elf/internal.h" |
| 33 | #include "elf/common.h" |
| 34 | |
| 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 | |
| 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 |
| 86 | rx_load (bfd *prog, host_callback *callback) |
| 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); |
| 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); |
| 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 | |
| 177 | reset_decoder (); |
| 178 | |
| 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 | } |