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| Rev | Author | Line No. | Line |
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| 2928 | svoboda | 1 | /* |
| 2 | * Copyright (c) 2008 Jiri Svoboda |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup loader |
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| 30 | * @brief Loads and runs programs from VFS. |
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| 31 | * @{ |
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| 32 | */ |
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| 33 | /** |
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| 34 | * @file |
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| 35 | */ |
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| 36 | |||
| 37 | #include <stdio.h> |
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| 38 | #include <unistd.h> |
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| 39 | #include <fcntl.h> |
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| 40 | #include <sys/types.h> |
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| 2959 | svoboda | 41 | #include <as.h> |
| 2928 | svoboda | 42 | |
| 43 | #include "elf.h" |
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| 2959 | svoboda | 44 | #include "pcb.h" |
| 2928 | svoboda | 45 | |
| 46 | unsigned int elf_load(int fd, elf_header_t *header); |
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| 47 | |||
| 48 | typedef void (*entry_point_t)(void); |
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| 49 | |||
| 50 | int elf_load_file(char *file_name, elf_header_t *header) |
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| 51 | { |
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| 52 | int fd; |
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| 53 | int rc; |
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| 54 | |||
| 55 | printf("open and read '%s'...\n", file_name); |
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| 56 | |||
| 57 | fd = open(file_name, 0); |
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| 58 | if (fd < 0) { |
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| 59 | printf("failed opening file\n"); |
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| 60 | return -1; |
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| 61 | } |
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| 62 | |||
| 63 | rc = elf_load(fd, header); |
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| 64 | printf("elf_load() -> %d\n", rc); |
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| 65 | |||
| 66 | close(fd); |
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| 67 | |||
| 68 | return rc; |
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| 69 | } |
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| 70 | |||
| 71 | void elf_run(elf_header_t *header) |
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| 72 | { |
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| 73 | entry_point_t entry_point; |
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| 74 | |||
| 75 | entry_point = (entry_point_t)header->e_entry; |
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| 76 | (*entry_point)(); |
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| 77 | |||
| 78 | /* not reached */ |
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| 79 | } |
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| 80 | |||
| 2959 | svoboda | 81 | void elf_create_pcb(elf_header_t *header) |
| 82 | { |
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| 83 | pcb_t *pcb; |
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| 84 | void *a; |
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| 85 | |||
| 86 | pcb = (pcb_t *)PCB_ADDRESS; |
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| 87 | |||
| 88 | a = as_area_create(pcb, sizeof(pcb_t), AS_AREA_READ | AS_AREA_WRITE); |
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| 89 | if (a == (void *)(-1)) { |
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| 90 | printf("elf_create_pcb: memory mapping failed\n"); |
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| 91 | return EE_MEMORY; |
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| 92 | } |
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| 93 | |||
| 94 | pcb->entry = (entry_point_t)header->e_entry; |
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| 95 | } |
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| 96 | |||
| 2928 | svoboda | 97 | int main(int argc, char *argv[]) |
| 98 | { |
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| 2959 | svoboda | 99 | elf_header_t prog_header; |
| 100 | elf_header_t interp_header; |
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| 2928 | svoboda | 101 | char *file_name; |
| 102 | int rc; |
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| 103 | |||
| 104 | printf("This is loader\n"); |
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| 105 | getchar(); |
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| 106 | |||
| 2959 | svoboda | 107 | printf("Load program\n"); |
| 2928 | svoboda | 108 | |
| 2959 | svoboda | 109 | rc = elf_load_file("/tetris", &prog_header); |
| 2928 | svoboda | 110 | if (rc < 0) { |
| 111 | printf("failed to load program\n"); |
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| 112 | return 1; |
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| 113 | } |
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| 114 | |||
| 2959 | svoboda | 115 | printf("Create PCB\n"); |
| 116 | elf_create_pcb(&prog_header); |
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| 2928 | svoboda | 117 | |
| 2959 | svoboda | 118 | printf("Load dynamic linker\n"); |
| 119 | file_name = "/rtld.so"; |
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| 120 | printf("open and read '%s'...\n", file_name); |
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| 121 | rc = elf_load_file(file_name, &interp_header); |
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| 122 | if (rc < 0) { |
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| 123 | printf("failed to load dynamic linker\n"); |
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| 124 | return 1; |
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| 125 | } |
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| 126 | |||
| 127 | printf("run dynamic linker\n"); |
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| 128 | elf_run(&interp_header); |
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| 129 | |||
| 2928 | svoboda | 130 | /* not reached */ |
| 131 | return 0; |
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| 132 | } |
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| 133 | |||
| 134 | /** @} |
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| 135 | */ |